Updated on 2025/04/24

Information

 

写真a

 
YODOSHI NORIHARU
 
Organization
Faculty of Engineering Department of Mechanical Engineering Associate Professor
School of Engineering (Concurrent)
Graduate School of Engineering Department of Mechanical Engineering(Concurrent)
Title
Associate Professor
External link

Research Areas

  • Nanotechnology/Materials / Material processing and microstructure control

Degree

  • Ph.D.

Research History

  • Kyushu University Faculty of Engineering Associate Professor 

    2021.10 - Present

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  • 東北大学 金属材料研究所 助教   

Research Interests・Research Keywords

  • Research theme: 非平衡材料

    Keyword: 非平衡材料

    Research period: 2024

  • Research theme: 粉末冶金工学

    Keyword: 粉末冶金工学

    Research period: 2024

  • Research theme: 材料加工プロセス

    Keyword: 材料加工プロセス

    Research period: 2024

  • Research theme: Study on powder metallurgy process

    Keyword: monodispersed particles, containerless solidification process, viscous flow processing, high entropy alloys, non-equilibrium materials, composite materials

    Research period: 2021.10

  • Research theme: Study on elucidation of pore formation mechanism of gas atomized powders.

    Keyword: Synchrotron X-ray CT, rapid solidification process, gas atomization, image analysis

    Research period: 2020.4

  • Research theme: Development of non-equilibrium soft magnetic materials

    Keyword: soft magnetic materials, amorphous alloys, nano-crystallization, low core loss

    Research period: 2012.4

  • Research theme: Development of high-precision high-strength mechanical parts by micro viscous flow processing.

    Keyword: viscous flow process, micro parts, glass forming alloy

    Research period: 2008.4

Papers

  • Combined PFM/DEM Analysis of Sintering Behavior of Powder Mixtures with Dispersed/Aggregated Particle Structures in Non-Reactive System Reviewed

    Shinagawa Kazunari, Kudo Kentaro, Yodoshi Noriharu

    Journal of the Japan Society of Powder and Powder Metallurgy   72 ( Supplement )   S297 - S304   2025.3   ISSN:05328799 eISSN:18809014

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    Language:English   Publisher:Japan Society of Powder and Powder Metallurgy  

    <p>To examine the effects of morphology of metal-ceramic mixtures on the sinterability, a method of simulating the sintering process with no chemical reaction between two dissimilar powder materials is proposed, based on the combined phase-field method (PFM) and discrete element method (DEM). The initial arrangements of dispersed/aggregated particles are prepared with the mixing ratio of two powders changing in the range from 0 to 100%. The calculated results indicate that the sintering shrinkage of powder compacts with dispersed particles is lower than that of aggregated particles, which agrees with the experimental observation in a previous study. It is also confirmed that the grain growth behavior is affected by the dispersion degree of dissimilar particles. The average grain size is decreased with mixing ratio, especially in the case of dispersed particles.</p>

    DOI: 10.2497/jjspm.15a-t3-06

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  • Evaluation and Suppression of Porosity in Gas-atomized Powders Reviewed

    Yodoshi Noriharu, Sakurai Ikuya, Kudo Kentaro, Shinagawa Kazunari

    Journal of the Japan Society of Powder and Powder Metallurgy   72 ( Supplement )   S99 - S104   2025.3   ISSN:05328799 eISSN:18809014

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    Language:English   Publisher:Japan Society of Powder and Powder Metallurgy  

    <p>Recently, the demand for high-quality gas-atomized powders has increased. Some particles in gas-atomized powders contain internal pores, and the presence of these pores may result in the degradation of various properties of the final product manufactured through a specific process. However, the mechanism of the internal pore formation has not yet been elucidated. In this study, various alloy powders were prepared using the gas atomization method, and their internal pores were observed using synchrotron X-ray CT. The results showed that alloys with a wider solid–liquid coexistence temperature range exhibited a higher porosity–volume ratio. This suggests that gas bubbles are more likely to be entrained during secondary droplet breakup. It was also found that introducing a small amount of hydrogen as a reducing agent into the spray gas reduced these quantities.</p>

    DOI: 10.2497/jjspm.14c-sis1-02

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  • DIC Analysis of Large-deflection deformation during Sintering of MIM Compacts Reviewed

    Kudo Kentaro, Tanaka Atsuki, Osada Toshiko, Yodoshi Noriharu, Shinagawa Kazunari

    Journal of the Japan Society of Powder and Powder Metallurgy   72 ( Supplement )   S651 - S658   2025.3   ISSN:05328799 eISSN:18809014

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    <p>Powder molded compacts, characterized by low powder filling rates such as Metal Injection Molding (MIM), often exhibit problems with deformation during sintering due to their large shrinkage and low strength. In this study, the Digital Image Correlation method (DIC) was used for in-situ observation of sintering in Ni powder compacts fabricated by MIM to investigate their large-deflection deformation behavior. As a result, it was revealed that there is a time point when the deviatoric vertical strain in the longitudinal direction becomes tensile across the entire base of the molded compacts. This strain distribution was not symmetrical distribution of tensile and compressive strains, as is typically observed in the small deflection deformation of an elastic body. Additionally, a finite element analysis was performed using a plastic deformation model for porous materials, and it was confirmed that similar results were obtained.</p>

    DOI: 10.2497/jjspm.15d-t8-05

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  • Preface to Special Issue on Disciplinary Development of Materials Science into the Humanities Field, Cultural Heritage and Archaeology

    Nagase Takeshi, Kitamura Kazuhiro, Ishikawa Fumitaro, Oka Hiroshi, Yodoshi Noriharu, Fujita Masaki

    Materia Japan   64 ( 3 )   147 - 147   2025.3   ISSN:13402625 eISSN:18845843

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    Language:Japanese   Publisher:The Japan Institute of Metals and Materials  

    DOI: 10.2320/materia.64.147

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  • Direct imaging of gas atomization process accompanying surface oxidation of tin droplets Reviewed

    Taiko Tanimoto, Nao Uchida, Mengjia Ren, Zhenying Wang, Chihiro Inoue, Jun Horiuchi, Takuya Takashita, Kazutoyo Yamada, Noriharu Yodoshi

    Materials and Design   247   2024.11   ISSN:0264-1275 eISSN:1873-4197

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    Publishing type:Research paper (scientific journal)   Publisher:Materials and Design  

    Fine metal particles produced by gas atomization are recognized as an essential material for additive manufacturing. However, spatio-temporally resolved images for the atomization process are still lacking. In the present study, we apply a high-speed Schlieren optical system synchronized with a pulse light source with flashing period of 30 ns to a simple atomization setup, consisting of a single supersonic [Formula presented] jet at Mach number of 1.5 and free-falling tin droplets. Covering the tin droplets by Ar gas, we generate spherical droplets by minimizing the initial oxidation from the ambient. Impinging on the large-momentum gas jet, the tin droplet largely deforms to be shaved the bottom end and bounced above the jet with partially penetrating inside the gas core. The spreading ligaments above the jet thins at first along with the capillary timescale. As the surface oxidation proceeds, the neck transitionally shrinks according to the viscous-capillary timescale, which evidences the direct observation of gas atomization process superposed by the molecular diffusion across the interface. Statistics of collected metal particles demonstrate a bimodal distribution for the diameter, originated from the distinct atomization mechanisms of aerodynamic dominant breakup inside the gas jet and of capillary dominant breakup spreading above the jet.

    DOI: 10.1016/j.matdes.2024.113413

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  • Simulation of Anisotropic Sintering of Elliptical Particles by Combined PFM/DEM Approach

    SHINAGAWA Kazunari, KUDO Kentaro, YODOSHI Noriharu

    Journal of the Japan Society of Powder and Powder Metallurgy   advpub ( 0 )   538 - 546   2024   ISSN:05328799 eISSN:18809014

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    Language:English   Publisher:Japan Society of Powder and Powder Metallurgy  

    <p>Anisotropic shrinkage of powder compacts is often observed in sintering process. Although controlling the shape and size of the sintered body is important to reduce manufacturing cost, it is difficult to understand the factors affecting anisotropic behavior only by experimental observation. In the present study, two-dimensional numerical simulation for sintering process of elliptical particles is performed with changing particle alignment and orientation by using a combined phase-field method (PFM) and discrete element method (DEM). The effects of the size of inter-particle contact plane, the sintering force, and the pore configuration on sintering anisotropy are examined. According to the calculated results, anisotropic shrinkage appears depending on the particle arrangement. The elliptical particles oriented horizontally enhance the horizontal shrinkage. The inter-particle contact in vertical direction reduces the vertical shrinkage. The shrinkage behavior of compacts of elliptical particles can be basically explained by considering the combination of the sintering stress and the size of inter-particle contact plane, except the case of arrangement with largely elongated pore structure.</p>

    DOI: 10.2497/jjspm.24-00011

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    Other Link: https://ndlsearch.ndl.go.jp/books/R000000004-I033883518

  • Fabrication and excellent performance of amorphous FeSiBCCr/organic-inorganic hybrid powder core Reviewed International journal

    Xiaohuan Chen, Yan Zhang, Fang Zhao, Mingqiang Tang, Mingliang Xiang, Juntao Huo, Meng Gao, Yaocen Wang, Noriharu Yodoshi, Liyuan Zhang, Junqiang Wang

    Journal of Non-Crystalline Solids   616   2023.9   ISSN:0022-3093 eISSN:1873-4812

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    Language:Others   Publishing type:Research paper (scientific journal)   Publisher:Journal of Non-Crystalline Solids  

    Soft magnetic composites (SMCs) are widely used in relevant inductance components in power and electronic fields. The development of high frequency devices requires SMCs to exhibit good insulation and excellent soft magnetic properties. The insulation coating for SMCs is crucial, and it is necessary to ensure that the coating thickness is uniform and maintains excellent adhesion to the powder. In the present work, a novel and efficient solution for the formation of insulating coatings, i.e. phytic acid/silane (denoted as PAS) organic-inorganic hybrid solution, was prepared by the condensation reaction between PA and γ-(2,3-epoxypropoxy) propyl trimethoxy silane. The FeSiBCCr@PAS powder with a core-shell structure has been successfully prepared through chemical reaction in a modified PAS solution. The effects of insulating coating content on the magnetic and mechanical properties of FeSiBCCr@PAS powder cores were systematically investigated. The PAS hybrid insulating coating can significantly improve the DC-bias performance and reduce the core loss. The optiomal powder core, which was prepared by using the powder coated with 3 g/L phytic acid, exhibits a minimum core loss (P50mT/1MHz) of 2979.2 mW/cm3, high effective permeability μe(0.1A/m) of 33.8, and superior DC-bias(100Oe) performance of 80.8%. Present work developed an effective method to prepare high performance powder cores with good soft magnetic and mechanical properties.

    DOI: 10.1016/j.jnoncrysol.2023.122482

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  • Effect of P addition on soft magnetic properties of Fe–Si–B–P–Cu–C nano-crystalline alloys Reviewed International journal

    Ziyan Hao, Linzhuo Wei, Lei Gao, Yaocen Wang, Xiaojun Bai, Xing Tong, Xiaoyu Liang, Noriharu Yodoshi, Rie Umetsu, Yoshiyuki Kawazoe, Yan Zhang, Chongde Cao

    Intermetallics   151   2022.12   ISSN:0966-9795 eISSN:1879-0216

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    Language:Others   Publishing type:Research paper (scientific journal)   Publisher:Intermetallics  

    The effect of P addition on the nano-crystallization of Fe81.5Si0.5B15.5-xPxCu0.5C2 (x = 0, 4.5, 7.5, 11 at.%) amorphous alloys under various heating rates has been studied. Appropriate P addition enhanced the thermal stability of Fe–Si–B–P–Cu–C amorphous alloys. The results also revealed that P addition could decrease the required critical heating rate for the low coercivity and improve the magnetic softness of annealed samples. Although as commonly found in most Fe-based nano-crystalline alloys, a small amount of P addition (4.5 at.%) could effectively help reduce the coercivity when a high heating rate was applied during nano-crystallization, the high heating rate failed to decrease the coercivity in 7.5 at.% P-added alloys and even reversely caused the deterioration of magnetic softness for excessive P addition (11 at.%). The unusual phenomenon in the alloy with 11 at.% P addition lies in the fast increase of diffusion rate with rising temperature and delayed nucleation, which are caused by the weakened bond energy and increased segregation energy, respectively. The results suggest that the improvement of magnetic softness for Fe-based nano-crystalline alloys through simply increasing the P addition would meet its ceiling, due to the limited decrease in coercivity and even increase through applying high heating rate with excessive P concentration. The understanding of P role on the nano-crystallization mechanism could contribute to the compositional design of high-performance soft magnetic Fe-based alloys with an acceptable heating rate in industry.

    DOI: 10.1016/j.intermet.2022.107713

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  • Effect of Si addition on the magnetic properties of FeNi-based alloys with L1<inf>0</inf> phase through annealing amorphous precursor Reviewed International journal

    Ziyan Hao, Linzhuo Wei, Yaocen Wang, Yoshiyuki Kawazoe, Xiaoyu Liang, Rie Umetsu, Noriharu Yodoshi, Xing Tong, Weixing Xia, Yan Zhang, Chongde Cao

    Journal of Alloys and Compounds   920   2022.11   ISSN:0925-8388 eISSN:1873-4669

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    Language:Others   Publishing type:Research paper (scientific journal)   Publisher:Journal of Alloys and Compounds  

    As a promising candidate of rare-earth free hard magnetic materials, L10-FeNi has been paid much attention in the last decades. However, it is difficult to be artificially fabricated due to its low thermal stability and sluggish diffusion ability of atoms below the crucial temperature of 320 °C. In this study, a promising method of annealing amorphous precursor was extensively developed through (Fe50Ni50)84−xSixP16 (x = 0, 4 at%) and (Fe50Ni50)86−xSixP14 (x = 2, 4, 8 at%) alloys. Especially, the effect of Si on the formation of L10 phase in annealed FeNi-based alloys was investigated and clarified. It is found Fe42Ni42P16 with a much low crystallization temperature could be an appropriate basic amorphous alloy for the formation of L10 phase. The addition of Si enhanced the thermal stability of Fe-Ni-P amorphous alloys. Interestingly, Si could stabilize the L10 phase in annealed samples and increase its disordering temperature above which L10-FeNi phase could deteriorate into soft magnetic phase. As expected, appropriate Si addition indeed improved the hard magnetic properties of the annealed alloys and samples with high coercivity above 900 Oe was obtained. Further Si addition would deteriorate the magnetic-crystalline anisotropy of L10 phase and decrease the coercivity of annealed Fe-Ni-Si-P alloys. Nevertheless, the results indicate that increasing the order-disorder transition temperature through element doping in L10 lattice would be a promising strategy for the massive formation of L10-FeNi like other ordered phases (i.e. L12-FeNi, L10-CoPt), and could substantively contribute to the artificial fabrication of FeNi-based rare-earth free magnets in future.

    DOI: 10.1016/j.jallcom.2022.166029

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  • Magnetization Controlled by Crystallization in Soft Magnetic Fe-Si-B-P-Cu Alloys. Reviewed International journal

    Hiroshi Nakajima, Akihiro Osako, Noriharu Yodoshi, Yoshiharu Yamada, Hirofumi Tsukasaki, Ken Harada, Yuki Sakai, Kei Shigematsu, Takumi Nishikubo, Masaki Azuma, Shigeo Mori

    Microscopy (Oxford, England)   72 ( 4 )   274 - 278   2022.8   ISSN:2050-5698 eISSN:2050-5701

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Microscopy  

    Soft magnetic materials have low coercive fields and high permeability. Recently, nanocrystalline alloys obtained using annealing amorphous alloys have attracted much interest since nanocrystalline alloys with small grain sizes of tens of nanometers exhibit low coercive fields comparable to that of amorphous alloys. Since nanocrystalline soft magnetic materials attain remarkable soft magnetic properties by controlling the grain size, the crystal grains' microstructure has a substantial influence on the soft magnetic properties. In this research, we examined the magnetic properties of Fe-Si-B-P-Cu nanocrystalline soft magnetic alloys obtained by annealing amorphous alloys. During crystallization, the observation findings reveal the correlation between the generated microstructures and soft magnetic properties.

    DOI: 10.1093/jmicro/dfac042

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  • Evaluation of Porosity in Gas-Atomized Powder by Synchrotron X-ray CT and Investigation of the Effect of Gas Species Reviewed International journal

    Noriharu Yodoshi, Takahide Endo, Naoya Masahashi

    MATERIALS TRANSACTIONS   62 ( 10 )   1549 - 1555   2021.10

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    DOI: 10.2320/matertrans.mt-y2021001

    Repository Public URL: https://hdl.handle.net/2324/7173488

  • Anisotropic Nd-Fe ultrafine particles with stable and metastable phases prepared by induction thermal plasma Invited Reviewed International journal

    Y. Hirayama, M. Shigeta, Z. Liu, N. Yodoshi, A. Hosokawa, K. Takagi

    JOURNAL OF ALLOYS AND COMPOUNDS   873   2021.8

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    DOI: 10.1016/j.jallcom.2021.159724

  • シンクロトロン光X線CTによるガスアトマイズ粉末に含まれる気孔量評価およびガス種の影響調査

    吉年 規治, 遠藤 嵩英, 正橋 直哉

    粉体および粉末冶金   68 ( 5 )   167 - 174   2021.5

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    Evaluation of Porosity in Gas-atomized Powder by Synchrotron X-ray CT and Investigation of the Effect of Gas Species

    DOI: 10.2497/jjspm.68.167

  • Processing soft ferromagnetic metallic glasses: on novel cooling strategies in gas atomization, hydrogen enhancement, and consolidation Reviewed

    N. Ciftci, N. Yodoshi, S. Armstrong, L. Mädler, V. Uhlenwinkel

    Journal of Materials Science and Technology   59   26 - 36   2020.12

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    © 2020 Processing soft ferromagnetic glass-forming alloys through gas atomization and consolidation is the most effective technique to produce bulk samples. The commercial viability of these materials depends on commercial purity feedstock. However, crystallization in commercial purity feedstock is several orders of magnitude faster than in high purity materials. The production of amorphous powders with commercial purity requires high cooling rates, which can only be achieved by extending the common process window in conventional gas atomization. The development of novel cooling strategies during molten metal gas atomization on two model alloys ({(Fe0.6Co0.4)0.75B0.2Si0.05}96Nb4 and Fe76B10Si9P5) is reported. Hydrogen inducement during liquid quenching significantly improved the glass-forming ability and soft magnetic properties of {(Fe0.6Co0.4)0.75B0.2Si0.05}96Nb4 powders. Spark plasma sintering experiments verified that amorphous rings could be produced regardless of the cooling strategies used. While the saturation magnetization was almost unaffected by consolidation, the coercivity increased slightly and permeability decreased significantly. The magnetic properties of the final bulk samples were independent of feedstock quality. The developed cooling strategies provide a great opportunity for the commercialization of soft ferromagnetic glass-forming alloys with commercial purity.

    DOI: 10.1016/j.jmst.2020.03.077

  • Microstructure and thermoelectric properties of higher manganese silicides fabricated via gas atomization and spark plasma sintering Reviewed

    Lei Liu, Hiraku Oda, Tetsuhiko Onda, Noriharu Yodoshi, Takeshi Wada, Zhong Chun Chen

    Materials Chemistry and Physics   249   2020.7

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    © 2020 Elsevier B.V. Higher manganese silicides (HMS) powders were successfully prepared by a gas atomization technique. The gas atomized (GAed) powders showed spherical morphologies and a wide particle size distribution. No MnSi and Si phases were detected by XRD analyses, indicating that the high cooling rate during rapid solidification is effective in inhibiting the formation of second phases. When the GAed powders were consolidated by spark plasma sintering (SPS), the densified samples revealed almost the same phase composition as the powders and an isotropic feature. The contrast differences between different grains in backscattered electron images are believed to be associated with orientation differences. The HMS samples SPSed at different temperatures exhibited similar values of the Seebeck coefficient, but larger electrical conductivity and power factor were obtained in the sample SPSed at 1000 °C. Moreover, the HMS samples showed higher fracture toughness compared to those fabricated by a solid-state reaction and SPS process.

    DOI: 10.1016/j.matchemphys.2020.122990

  • Uniformity of the glassy state of iron-based metallic glassy particles and reproducibility of fabricating microparts

    Rui Yamada, Noriharu Yodoshi, Naoyuki Nomura, Junji Saida, Akira Kawasaki

    Materials & Design   191   108667 - 108667   2020.6

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    The uniformity of the glassy state of [(Fe Co ) Si B ] Nb metallic glassy particles prepared using our own developed technique, called the pulsated orifice ejection method (POEM), was investigated. Differential scanning calorimetry (DSC) results revealed that the thermal histories of the particles prepared from the same batch were almost identical. This suggested that the particles with the same size/volume possessed almost the same glassy state and had advantages as raw materials for microparts. The fabricated final product using our proposed process, termed as micro viscous flow processing, where a single particle is compressed with a precise jig under strictly controlled processing conditions, was confirmed to maintain a fully amorphous structure. DSC scans of each micropart traced nearly the same path, which indicated that their glassy states were still almost identical after processing. The precise control of the temperature and applied load enable the final products to achieve almost the same thermal histories and also geometric shapes. This is the first report that proves the high reproducibility of fabricating Fe-based metallic glassy microparts with high quality. Our proposed sequential process may shed light on a new fabrication technique of microparts using metallic glasses. 0.5 0.5 0.75 0.05 0.2 96 4

    DOI: 10.1016/j.matdes.2020.108667

  • Crack initiation behavior of titanium boride whisker reinforced titanium matrix composites during small punch testing

    Hiroki Kurita, Kazuya Sakayanagi, Shoichi Kikuchi, Noriharu Yodoshi, Sophie Gourdet, Fumio Narita

    Material Design & Processing Communications   1 ( 4 )   2019.8

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    DOI: 10.1002/mdp2.80

  • Strengthening Mechanism of Titanium Boride Whisker-Reinforced Ti-6Al-4V Alloy Matrix Composites with the TiB Orientation Perpendicular to the Loading Direction

    Hiroki Kurita, Shiori Suzuki, Shoichi Kikuchi, Noriharu Yodoshi, Sophie Gourdet, Fumio Narita

    Materials   12 ( 15 )   2401 - 2401   2019.7

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    We fabricated fully dense titanium boride (TiB) whisker-reinforced Ti-6Al-4V alloy matrix (Ti6Al4V-TiB) composites, with a homogeneous dispersion, a TiB orientation perpendicular to the loading direction (; two-dimensional random direction) and an intimate Ti/TiB interface without an intermediate interfacial layer in the Ti-6Al-4V alloy matrix, by spark plasma sintering. Microstructural analysis allows us to present the tensile properties of the Ti6Al4V-TiB composites with the theories for discontinuous fiber-reinforced composites. The Ti6Al4V-TiB 10 vol.&#37; composite yielded a Young’s modulus of 130 GPa, an ultimate tensile strength (UTS) of 1193 MPa and an elongation of 2.8&#37;. The obtained experimental Young’s modulus and UTS of the Ti6Al4V-TiB composites were consistent with the theoretical values estimated by the Halpin-Tsai and Shear-lag models. The good agreement between our experimental results and these models indicates that the TiB whiskers behave as discontinuous fibers in the Ti-6Al-4V alloy matrix.

    DOI: 10.3390/ma12152401

  • Tensile Fracture of TiB Whisker Reinforced Ti Alloy Matrix Composites

    Hiroki Kurita, Katsuyoshi Kondoh, Junko Umeda, Noriharu Yodoshi

    Materials Science Forum   941   1961 - 1965   2018.12

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    TiB whisker reinforced Ti alloy matrix (Ti–TiB) composites have attracted attention as the aerospace materials with their high specific mechanical properties for long time. However, strengthening mechanism of Ti–TiB composites has not been revealed because of the agglomeration and incomplete precipitation of TiB whiskers in the Ti alloy matrix yet. In this study, we addressed to fabricate fully-dense TiB whisker reinforced Ti-6Al-4V alloy matrix (Ti6Al4V–TiB) composites via powder metallurgical process, which have the microstructure to discuss their tensile properties with the theories for composite materials. The Young’s modulus and ultimate tensile strength of Ti6Al4V–10 vol% TiB composite were 130 GPa and 1193 MPa, respectively. Note that the elongation of Ti6Al4V–10 vol% TiB composite was approximately 2.8 % although the elongations of Ti–TiB composite have been reported are few (; less than 1%) due to the agglomeration of TiB whiskers in Ti matrix.

    DOI: 10.4028/www.scientific.net/msf.941.1961

  • 無容器凝固法による高品位鉄系金属ガラス原料粒子の合成と1粒子の粘性流動加工プロセスによる高精度・高強度マイクロ部品の創製

    吉年規治

    先端加工技術   ( 104 )   16   2018.4

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    無容器凝固法による高品位鉄系金属ガラス原料粒子の合成と1粒子の粘性流動加工プロセスによる高精度・高強度マイクロ部品の創製

  • Effects of nanocrystallisation on saturation magnetisation of amorphous Fe<inf>76</inf>Si<inf>9</inf>B<inf>10</inf>P<inf>5</inf> Reviewed

    Noriharu Yodoshi, Shunpei Ookawa, Rui Yamada, Naoyuki Nomura, Keiko Kikuchi, Akira Kawasaki

    Materials Research Letters   6 ( 1 )   100 - 105   2018.1

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    © 2017 The Author(s). Amorphous Fe76Si9B10P5 particles were fabricated by a container-free solidification process and subsequent annealing, and their structural and magnetic properties were investigated by X-ray diffraction analysis, transmission electronic microscopy, and vibrating sample magnetometry. The annealing induced the nanocrystallisation of α-Fe and Fe-B compounds. The proportions of the different crystalline phases formed were dependent on the annealing temperature. The saturation magnetisation of the single particles was higher than that of the samples prepared by a conventional quenching process; this was attributable to the higher homogeneity of the nanocrystalline grains of the former as well as their higher α-Fe to Fe-B compound ratio. (Figure presented) IMPACT STATEMENT We have investigated single particles obtained by a container-free solidification process to gain deeper insight into their magnetic properties than is possible with samples obtained by conventional processes.

    DOI: 10.1080/21663831.2017.1398191

  • Temperature dependency of viscosity of Fe<inf>76</inf>Si<inf>9</inf>B<inf>10</inf>P<inf>5</inf> supercooled liquid and hetero-amorphous structure Reviewed

    N. Yodoshi, S. Ookawa, R. Yamada, A. Kawasaki, A. Makino

    Journal of Alloys and Compounds   679   164 - 168   2016.9

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    © 2016 Elsevier B.V. All rights reserved. In this study, we evaluated the thermal stability and fragility of Fe76Si9B10P5 supercooled liquid by using micrometer-scale particles prepared via a container-less solidification process. After construction of time-temperature-transformation (TTT) diagram of crystallization by means of isothermal DSC under various temperatures, we could successfully measure the viscosity of the particles in the supercooled liquid region by employing the single particle compressive test (SPCT). It is revealed that the temperature dependency of viscosity cannot be well fitted by the Vogel-Fulcher-Tammann (VFT) formula but can be fitted by an Arrhenius plot. The Angell plot indicates that the apparent fragility is higher than that of SiO2 and the fabricated particles have hetero-amorphous structures composed of high-density nanoscale clusters dispersed uniformly in a glassy matrix phase.

    DOI: 10.1016/j.jallcom.2016.04.032

  • Mechanically strong nanocrystalline Fe-Si-B-P-Cu soft magnetic powder cores utilizing magnetic metallic glass as a binder Reviewed

    Jian Luan, Parmanand Sharma, Noriharu Yodoshi, Yan Zhang, Akihiro Makino

    AIP Advances   6 ( 5 )   2016.5

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    © 2016 Author(s). We report on the fabrication and properties of soft magnetic powder cores with superior mechanical strength as well as low core loss (W). Development of such cores is important for applications in automobiles/devices operating in motion. High saturation magnetic flux density (Bs) Fe-Si-B-P-Cu powder was sintered with Fe55C10B5P10Ni15Mo5 metallic glass (MG) powder in its supercooled liquid state by spark plasma sintering. The sintered cores are made from the nanocrystalline powder particles of Fe-Si-B-P-Cu alloy, which are separated through a magnetic Fe55C10B5P10Ni15Mo5 MG alloy. Low W of ∼ 2.2 W/kg (at 1T and 50 Hz), and high fracture strength (yielding stress ∼500 MPa), which is an order of magnitude higher than the conventional powder cores, were obtained. Stronger metal-metal bonding and magnetic nature of MG binder (which is very different than the conventional polymer based binders) are responsible for the superior mechanical and magnetic properties. The MG binder not only helps in improving the mechanical properties but it also enhances the overall Bs of the core.

    DOI: 10.1063/1.4944766

  • Evaluation of critical cooling rate of Fe<inf>76</inf>Si<inf>9</inf>B<inf>10</inf>P<inf>5</inf> metallic glass by containerless solidification process Reviewed

    N. Yodoshi, R. Yamada, A. Kawasaki, A. Makino

    Journal of Alloys and Compounds   643 ( S1 )   S2 - S7   2015.6

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    © 2015 Elsevier B.V. All rights reserved. We aim to prepare monodispersed and homogenous spherical particles of pure Fe76Si9B10P5 metallic glass with a low content of nucleation sites, and to evaluate the intrinsic glass-forming ability of Fe76Si9B10P5 alloys by containerless solidification. Monodispersed Fe76Si9B10P5 particles were successfully prepared by our originally developed pulsated orifice ejection method under He and Ar gas atmosphere. All obtained particles, with diameters ranging from 313 to 664 μm, were identified as single glassy or amorphous phases by X-ray diffraction, differential scanning calorimetry, and transmission electron microscopy. The critical cooling rate to form the fully glassy or amorphous phase was estimated in less than 550 K/s by a Newtonian cooling model. The results show that the Fe76Si9B10P5 alloy has sufficient glass-forming ability under restrained nucleation conditions.

    DOI: 10.1016/j.jallcom.2015.04.088

  • Production of a magnetic material with the ability to change from very soft to semi-hard magnetic Reviewed

    Yan Zhang, Parmanand Sharma, Noriharu Yodoshi, Akihiro Makino

    Journal of Applied Physics   117 ( 17 )   2015.5

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    © 2015 AIP Publishing LLC. Development and magnetic properties of an alloy that can change from very soft to semi-hard magnetic are reported. We found that as quenched ribbons of Fe75.3Pt8B12P4Cu0.7 alloy are amorphous by X-ray. Heat treatment in the temperature range of 400-450°C causes formation of many α-Fe grains in the amorphous matrix. Hard magnetic L10 FePt grains appear at ∼520°C. This alloy shows a high saturation magnetic flux density [Bs (≈ Ms)>1.55T] along with the ability to vary coercivity (Hc) from ∼25A/m to 11000A/m. The Hc can be increased further to more than 21000A/m, but at the expense of a significant decrease in Bs. The ability to control magnetic properties lies in a precise control over the soft and hard magnetic phases, which are strongly exchange coupled.

    DOI: 10.1063/1.4916812

  • Micro viscous flow processing of Fe-based metallic glassy particles Reviewed

    N. Yodoshi, R. Yamada, A. Kawasaki, A. Makino

    Journal of Alloys and Compounds   615 ( S1 )   S61 - S66   2014.12

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    © 2014 Elsevier B.V. All rights reserved. Fe-based metallic glasses are difficult to plastically form into complex shapes in their supercooled liquid region because of their rather high viscosity and low thermal stability. In this study, we proposed a novel two-step fabrication process for micro components using viscous flow of an Fe-based metallic glass. First, we prepare mono-sized [(Fe0.5Co0.5)0.75 Si0.05B0.2]96Nb4 spherical particles with precisely controlled volumes that correspond to the desired micro component volume. It is essential that the prepared spherical particles be composed of a single glassy phase. Then, one prepared particle is die-pressed into one micro component under the supercooled liquid region. The main deformation mechanism is viscous flow and the micro hot-press apparatus was used to realize the optimal processing conditions for micro viscous flow. The processed micro gear maintained the fully glassy phase, resulting in excellent mechanical strength, up to 1125 HV on average by the Vicker hardness test. Crystallization of the material during processing has been discussed related to the process temperature and deformation rate using the model of Kaysser and Arzt.

    DOI: 10.1016/j.jallcom.2013.12.256

  • Stress relaxation behavior of Fe-Co-Si-B-Nb metallic glassy alloys in their supercooled-liquid state Reviewed

    N. Yodoshi, R. Yamada, A. Kawasaki, A. Makino

    Journal of Alloys and Compounds   612   243 - 251   2014.11

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    Iron-based metallic glasses have attracted much attention for use as microscale components in many devices because they provide unique processability with nanoscale precision. Fe-based metallic glasses, however, do not have enough resistance against crystallization, and therefore their incubation time for crystallization is too short. To prevent crystallization, the processing temperature cannot be set too high within the supercooled-liquid region, and high processing speeds are required. Taking this into consideration, the viscoelastic properties were observed during the viscous-flow microprocessing of a single metallic glassy particle of [(Fe0.5Co0.5) 0.75Si0.05B0.2]96Nb4 metallic glass to identify its relaxation behavior of on the micrometer scale during a compressive test at 833 K. The relaxation behavior is found to be well described by the Kohlrausch-Williams-Watt model. The dependence of the ratio of the viscosity to the modulus of rigidity on the compressive speed during deformation was also investigated by constructing the master curve describing the behavior of the elasticity and viscosity fractions versus the apparent relaxation time. At a compressive strain rate of 4.5 × 10-2 s-1, the Fe-based metallic supercooled liquid behaved as a viscoelastic fluid, although at a compressive strain rate of 4.5 × 10 -3 s-1, its behavior was almost viscous. From the master curve, it can be concluded that the effect of the compressive speed on the ratio of the viscosity to the modulus of rigidity can clearly be observed, and the viscous-flow behavior of a [(Fe0.5Co0.5) 0.75Si0.05B0.2]96Nb4 metallic supercooled liquid can be predicted at any processing speed. © 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2014.05.006

  • Interface observation of iron based metallic glassy powder in pressurized liquid phase sintered compaction Reviewed

    N. Yodoshi, R. Yamada, A. Kawasaki, A. Makino

    Euro PM 2014 Congress and Exhibition, Proceedings   2014.11

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    To consolidate [(Fe0.5Co0.5)0.75Si0.05B0.2] 96 Nb4 metallic glassy powder to full density, a pressurized liquid phase sintering was employed, which was intended to promote a viscous flow deformation of solid particles and also to enhance the intergranular permeation of the liquid phase. Al-32.5wt.%Cu was chosen as a liquid phase component having low melting point. The mixed powders were sintered by induction heating furnace with heating rate of 200 K/min and applying pressure of 400 MPa for maintaining the amorphous phase. SEM and TEM observations shows the interfacial reaction layers were formed between metallic glassy phase and liquid phase. While this layer can contribute for to reinforce the fracture strength, the layer interferes with deformation of metallic glassy powders and also interferes with squeezing of liquid phase. This study report the interfacial microstructure between the powder particles by TEM observations.

  • Pressurized liquid phase sintering of iron based metallic glassy powder with Al-Cu eutectic alloy Reviewed

    N. Yodoshi, R. Yamada, A. Kawasaki, A. Makino

    International Powder Metallurgy Congress and Exhibition, Euro PM 2013   2013.10

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    The compressive fracture strength of the obtained metallic glass composite was found to be as high as 1820 MPa and the fracture w)as observed to be intragranulartype, suggesting a good bonding in the particle-binding phase interface.,To consolidate [(Fe0.5Co0.5)0.75Si0.05B0.2]96Nb4 metallic glass powder to full density, a pressurized liquid phase sintering was employed, which was intended to promote densification. Al-Cu eutectic alloy was chosen as a liquid phase component. However, the wettability of the glassy alloy with the AI-32.5wt%Cu alloy was revealed to be poor. Therefore, sintering pressure was applied to the compacts to promote a viscous flow deformation of glassy particles and also to enhance the intergranular permeation of the liquid phase. The liquid phase was found to fill completely the intergranular space of the powder compact, and the microstructure could be controlled by the punch displacement to squeeze out a part of the liquid phase from the compact.

  • Fe系およびPd系金属ガラス球形粒子作製時の冷却速度と容器壁の影響 Reviewed

    山田 類, 吉年 規治, 川崎 亮

    日本金屬學會誌   77 ( 4 )   139 - 146   2013.4

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    Effects of Cooling Rates and Container Walls in Preparation of Spherical Fe and Pd Based Metallic Glassy Particles
    &nbsp;&nbsp;Preparation of Fe-based and Pd-based metallic glassy particles with a diameter of around 500 &mu;m were investigated. Firstly, we measured the critical cooling rate of Pd42.5Cu30Ni7.5P20 metallic glass and our results showed that its critical cooling rate was about 0.4 K/s. Pd-based metallic glassy spherical particles with fully amorphous structure were successfully prepared by heating the samples on the Al2O3 substrate up to their melting points and cooling under the cooling rate of around 3 K/s. In contrast, [(Fe0.5Co0.5)0.75Si0.05B0.2]96Nb4 metallic glassy particles cannot be prepared by the same process. This seemed to be caused by a reaction between the Fe-based metallic glass and the Al2O3 substrate around its melting point. This result suggested that containerless solidification method is expected to be used to prepare Fe-based metallic glassy particles. We successfully prepared mono-sized spherical particles of [(Fe0.5Co0.5)0.75Si0.05B0.2]96Nb4 metallic glass by Pulsated Orifice Ejection Method (POEM) as an ideal process for Fe-based metallic glasses.

    DOI: 10.2320/jinstmet.77.139

  • Evaluation of viscosity for Fe-based metallic glass in the supercooled liquid region by a single-particle compressive test Reviewed

    N. Yodoshi, R. Yamada, A. Kawasaki, R. Watanabe

    Scripta Materialia   67 ( 12 )   971 - 974   2012.12

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    A new method for determining the viscosity of the supercooled liquid region of metallic glasses by means of a single-particle compressive test (SPCT) is proposed. A spherical metallic glassy particle several hundred micrometers in diameter is uniaxially pressed using a precisely controlled micro-hot-pressing system. Assuming viscous flow of the material, we derived the viscosity as a function of compressive load and displacement under a constant crosshead speed. SPCT is effective in evaluating metallic glass viscosity regardless of glass forming capability. © 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.scriptamat.2012.08.034

  • 加圧含浸法および圧力付加液相焼結法によるFe系金属ガラス粉末固化成形 Reviewed

    森田 直志, 吉年 規治, 山田 類, 川崎 亮

    日本金屬學會誌   76 ( 12 )   653 - 660   2012.12

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    Consolidation of Fe-Based Metallic Glassy Powder by Pressure Infiltration and Squeezing Liquid Phase Sintering
    &nbsp;&nbsp;In a previous paper we reported that slightly pressurized liquid phase sintering permits to fabricate fully dense Fe-based metallic glass composites, that the phase content of dual phase structure can be controlled by pressure squeezing of the liquid phase, and that the fracture strength increases with an increase in solid phase volume fraction. Throughout the process the pore shape at the contact of the particles, and accordingly the shape of the liquid phase at the particle contacts, were found to keep a cusp-shaped morphology, which implies and guarantees a complete penetration of the molten alloy into the pore space. In the present study, a model experiment was employed using a mono-sized spherical Fe-based metallic glassy powder to show an advantage of the present process for the fully dense composite structure and for the control of the composition of the two phase structure. Two types of experiments were conducted; one is pressure infiltration in which hot pressed solid skeleton was impregnated with a molten alloy, and the other is a squeezing liquid phase sintering, in which a mixture of the solid metallic glass powder and a liquid-phase alloy powder was hot pressed to control the relative density and the content of the liquid phase by squeezing out the molten alloy. The squeezing liquid phase sintering was found to give fully dense compacts, compared to the solid sintering of the metallic glass powder, which gives the relative density of 97.5&#37; at most. An incomplete penetration of molten alloy into the dense preform and also the formation of peripheral pores near the die wall in the case of the infiltration process are discussed.

    DOI: 10.2320/jinstmet.76.653

  • Preparation of Fe-based monodisperse spherical particles with fully glassy phase Reviewed

    Ayako Miura, Wei Dong, Masahiro Fukue, Noriharu Yodoshi, Kenta Takagi, Akira Kawasaki

    Journal of Alloys and Compounds   509 ( 18 )   5581 - 5586   2011.5

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    In this study, we prepared monodisperse spherical particles of a desired diameter using [(Fe0.5Co0.5)0.75B 0.2Si0.05]96Nb4 alloy; the particles were prepared by using an atomization process developed by us. The particles have perfect sphericity and narrow size distribution along with a homogeneous composition. The phase transitions of particles from the fully glassy phase to the crystalline phase via mixed phase structures occurred as the particle diameter was increased; the particles produced in the fully glassy phase in an argon atmosphere had a diameter of less than 300 μm. This allowed the estimation of the intrinsic critical cooling rate for the particles with a fully glassy phase, Rc:Rc varied in the range of 700-900 K/s and depended only on the initial temperature of the alloy melt. © 2011 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jallcom.2011.02.044

  • Synthesis of Fe based metallic glass-Pd based metallic glass composite by slightly pressured liquid phase sintering Reviewed

    N. Yodoshi, R. Yamada, N. Morita, A. Kawasaki, R. Watanabe

    Materials Transactions   51 ( 11 )   2056 - 2062   2010.11

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    To consolidate [(Fe0.5Co0.5)0.75Si 0.05B0.2]96Nb4 metallic glass powder to full density, a pressurized liquid phase sintering was employed, which was intended to promote densification by an enhanced wetting of a liquid phase with solid particles. Pd42.5Ni7.5P20Cu30 metallic glass powder, which has been reported to have a high glass forming ability and the lowest critical cooling rate of glass formation of 0.067 K/s, was chosen as a liquid phase component. The melting point of the Pd 42.5Ni7.5P20Cu30 metallic glass alloy of 763 K is lower than the glass transition temperature of the [(Fe 0.5Co0.5)0.75Si0.05B 0.2]96Nb4 metallic glass alloy of 808 K. However, the wettability of this alloy with the Pd42.5Ni 7.5P20Cu30 alloy was revealed to be poor. Therefore, sintering pressure was applied to the compacts to promote a viscous flow deformation of solid particles and also to enhance the intergranular permeation of the liquid phase. A specially designed micro-hot press was devised for the pressure-sintering experiment. A pseudo-wettability was observed during pressure-sintering, and the liquid phase was found to fill completely the intergranular space of the powder compact. The relative density of 64-95&#37;, as well as the sintering structure, could be controlled by the punch displacement to squeeze out a part of the liquid phase from the compact. The compressive fracture strength of the obtained metallic glass composite was found to be as high as 2051 MPa, and the fracture was observed to be intragranular type, suggesting a good bonding in the particle-binding phase interlace. ©2010 The Japan Institute of Metals.

    DOI: 10.2320/matertrans.M2010197

  • Consolidation of [(Fe<inf>0.5</inf>Co<inf>0.5</inf>)<inf>0.75</inf>Si <inf>0.05</inf>B<inf>0.2</inf>]<inf>96</inf>Nb<inf>4</inf> metallic glassy powder by SPS method Reviewed

    N. Yodoshi, R. Yamada, A. Kawasaki, R. Watanabe

    Materials Transactions   50 ( 9 )   2264 - 2269   2009.9

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    Metallic glasses have been reported to exhibit excellent properties, such as high strength, high corrosion resistance, high wear resistance, which result from their amorphous structure. Because of a drastic reduction in their viscosities in supercooled liquid region, metallic glasses have an excellent workability through viscous deformation for the production of various industrial parts. Recently, much attention has been paid to Fe-based metallic glasses because of their rich resources in addition to their excellent mechanical and magnetic properties. However, due to their poor glass-forming ability, the size of the Fe-based bulk metallic glass by conventional casting techniques is limited. In the present investigation, nearly fully densified disk-shaped compacts of [(Fe0.5Co0.5)0.75Sio 0.5Bo0.2.2]96Nb4 metallic glass were produced from a gas-atomized amorphous powder by spark plasma sintering (SPS). The processing temperature and the time that assure the supercooled liquid state of the compacts were determined from the Time-Temperature-Transformation (ttt) diagram that was constructed by isothermal differential scanning calorimetry. The mechanical properties of the consolidated samples were evaluated by compression test. Comparatively low values of the fracture stress. Young's modulus and yielding stress of SPSed sample compared to the casted samples were observed, which is discussed on the basis of the integrity of the interparticle bonding. © 2009 The Japan Institute of Metals.

    DOI: 10.2320/matertrans.M2009093

  • パルス圧力付加オリフィス噴射法で作製したFe系金属ガラス合金単分散粒子の構造評価とガラス相形成のための臨界冷却速度

    三浦 彩子, 董 偉, 福江 正浩, 吉年 規治, 宮崎 孝道, 川崎 亮

    日本金屬學會誌   73 ( 8 )   636 - 642   2009.8

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    Investigation on Structures of Mono-Sized Particles Prepared by Pulsated Orifice Ejection Method and the Critical Cooling Rate for Forming Glass Phase Structure
    &nbsp;&nbsp;Mono-sized [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4 alloy particles with desired particle size and high sphericity have been prepared by Pulsated Orifice Ejection Method (POEM). Each particle has uniform compositional distribution along with the same composition during processing. Phase transition of a particle from fully amorphous to amorphous/crystalline and then fully crystalline shows that the diameter of a single fully amorphous particle is less than 300 &mu;m in Ar atmosphere and 700 &mu;m in He atmosphere. The critical diameter of a fully amorphous phase particle shifts toward larger diameter with an increase in the initial melt temperature. The critical cooling rate to realize fully amorphous phase is estimated to be in the range of (700-900 K&times;s-1), which only depends on the initial melt temperature, irrespective of the atmospheres gases.

    DOI: 10.2320/jinstmet.73.636

  • 圧力付加液相焼結法によるFe系金属ガラス-Pd系金属ガラス複合材の作製

    吉年 規治, 森田 直志, 山田 類, 川崎 亮, 渡辺 龍三

    日本金屬學會誌   73 ( 8 )   643 - 650   2009.8

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    Synthesis of Fe Based Metallic Glass-Pd Based Metallic Glass Composite by Slightly Pressured Liquid Phase Sintering
    &nbsp;&nbsp;To consolidate [(Fe0.5Co0.5)0.75Si0.05B0.2]96Nb4 metallic glass powder to full density, a pressurized liquid phase sintering was employed, which was intended to promote densification by an enhanced wetting of a liquid phase with solid particles. Pd42.5Ni7.5P20Cu30 metallic glass powder, which has been reported to have a high glass forming ability and the lowest critical cooling rate of glass formation of 0.067 K/s, was chosen a liquid phase component. The melting point of the Pd42.5Ni7.5P20Cu30 metallic glass alloy of 763 K is lower than the glass transition temperature of the [(Fe0.5Co0.5)0.75Si0.05B0.2]96Nb4 metallic glass alloy of 808 K. However, the wettability of this alloy with the Pd42.5Ni7.5P20Cu30 alloy was revealed to be poor. Therefore, sintering pressure was applied to the compacts to promote a viscous flow deformation of solid particles and also to enhance the intergranular permeation of the liquid phase. A specially designed micro-hot press was devised for the pressure-sintering experiment. A pseudo wettability was observed during pressure-sintering, and the liquid phase was found to fill completely the intergranular space of the powder compact. The relative density of 64-95&#37;, as well as the sintering structure, could be controlled by the punch displacement to squeeze out a part of the liquid phase from the compact. The compressive fracture strength of the obtained metallic glass composite was found to be as high as 2051 MPa, and the fracture was observed to be intragranular type, suggesting a good bonding in the particle-binding phase interface.

    DOI: 10.2320/jinstmet.73.643

  • SPS法によるFe‐Co系金属ガラス粉末の固化成形

    山田 類, 吉年 規治, 川崎 亮, 渡辺 龍三

    日本金属学会誌   73 ( 4 )   299 - 305   2009.4

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    Consolidation of Fe-Co Based Metallic Glassy Powder by SPS Method
    &nbsp;&nbsp;Metallic glasses have been reported to exhibit excellent properties such as high strength, high corrosion resistance, high wear resistance, resulting from their random structure. In addition, metallic glasses usually exhibit a drastic reduction in viscosity in the supercooled liquid region. Therefore, metallic glasses have excellent workability in this temperature range and it has already been reported that large size of bulk metallic glasses are successfully fabricated in several Zr-, Pd-based metallic glasses. &nbsp;&nbsp; In recent years, Fe-based metallic glasses have been intensively studied because of their excellent mechanical performance, excellent magnetic properties and rich resources. However, due to their poor glass forming ability, the size of bulk metallic glasses is limited using a copper mold casting technique. &nbsp;&nbsp; In the present study, [(Fe0.5Co0.5)0.75Si0.05B0.2]96Nb4 bulk metallic glasses are fabricated by spark plasma sintering (SPS) of amorphous powders which have been prepared by a gas atomization. To find optimum conditions in the SPS process, Time-Temperature-Transformation diagram (TTT diagram) is also constructed by isothermal differential scanning calorimetry. After consolidation of metallic glassy powders, mechanical properties of consolidated glassy specimens are measured by compressive tests. &nbsp;&nbsp; As a result, the TTT diagram can be constructed and maximum incubation time can be predicted at any holding temperature. Using SPS method, large size and nearly 100% relative dense glassy compacts are obtained with a loading pressure of 75 MPa and 400 MPa, comprising full amorphous in the case within incubation time. Compressive tests indicate that mechanical properties of consolidated specimens are still low, and one of the reasons may be the formation of approximately 50 nanometer crystalline phases between each particle observed by Transmission Electron Microscope (TEM).

    DOI: 10.2320/jinstmet.73.299

  • パルス圧力付加オリフィス噴射法による単分散Fe系金属ガラス合金粒子の作製と評価 Reviewed

    三浦 彩子, 董 偉, 吉年 規治, 川崎 亮, 柳本 勝

    粉体および粉末冶金   56 ( 1 )   9 - 17   2009.1

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    Preparation of Mono-sized Fe-based Metallic Glass Micro Particles by Pulsated Orifice Ejection Method and Evaluation of the Particles
    The mono-sized [(Fe0.5Co0.5)0.75B0.2Si0.05]96Nb4 metallic glass micro spherical particles with narrow size distribution and high sphericity have been successfully prepared by Pulsated Orifice Ejection Method (POEM). The desired size of particles can be formed by adjusting process parameters, such as the rod displacement, the time for reaching the pulse voltage from zero voltage, the applied pressure and so on. The glassy fraction determined by enthalpy released for the particles during continuous heating in DSC, based on 70.23 J&middot;g&minus;1 as the enthalpy released of a fully amorphous particle (as proved by X-ray diffraction), shows that the changes of phase in one particle from single amorphous phase to amorphous crystalline mixed phase and then overall crystalline occur within the range of 350 mm and 400 mm in diameters. The critical cooling rate for the occurrence of crystalline in single amorphous phase is estimated to be within the range of 700 and 800 K&middot;sec&minus;1, which is slightly lower than that measured by time-temperature transformation diagram of the bulk metallic alloy, and supposed to be affected by the initial temperature of the melt.

    DOI: 10.2497/jjspm.56.9

  • 金属ガラス粉末のホットプレス緻密化制御 Reviewed

    渡辺 龍三, 吉年 規治, 加藤 秀実, 川崎 亮

    粉体および粉末冶金   55 ( 10 )   709 - 714   2008.10

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    Densification Control in Hot Pressing of Metallic Glass Powders
    The equations for the densification control by viscous flow in the hot pressing of metallic glass powders are derived and a criterion for the full densification thereof and an approach for the porosity control are proposed. The kinetic equations are derived on the basis of Arzt's hot pressing theory; in which the densification is modeled by the contraction of the Bolonoi cell of the random dense packing of spherical particles. The constitutive equation for the viscous flow is obtained from the hitherto proposed creep rate equation setting the rate exponent to be unity. The hypothetical constraint for the deformation due to the three grain edges formed in the later stage of densification is taken into account as a modification of the pressure term in the kinetic equations. The relative density is expressed as functions of hot pressing time and the ratio of the viscosity and the pressure. It is shown that the time required for full densification of metallic glass powders depends only on the viscosity/pressure ratio. The criterion for the full densification is expressed as a straight line on the time-viscosity/pressure ratio plane, which divides the area into full-dense and porous areas. The porosity control of the metallic glass powder compacts is also demonstrated as another practical application of the present theory. The results are discussed on the basis of the reported data.

    DOI: 10.2497/jjspm.55.709

  • パルス圧力付加オリフィス噴射法による球形単分散 Fe-Co 系金属ガラス粒子の作製 Reviewed

    吉年 規治, 三浦 彩子, 董 偉, 川崎 亮

    日本金属学会誌   72 ( 9 )   686 - 692   2008.9

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    Synthesis of Mono-Sized Fe-Co Based Metallic Glass Particles by Pulsated Orifice Ejection Method
    &nbsp;&nbsp;Metallic glasses are potentially applied for accurate micro parts because of their good formability and transferability as well as high mechanical properties and excellent magnetic properties. So the raw materials that the volume is precisely controlled are needed for a highly accurate processing. In this study, mono-sized spherical particles of Fe-Co-based metallic glass were prepared by Pulsated Orifice Ejection Method (POEM) and the capabilities of their micro-forming process in the glass transition temperature were investigated. &nbsp;&nbsp; Mono-sized spherical particles of Fe-Co-based metallic glass particles with 200-500 &mu;m of diameter have been obtained by Pulsated Orifice Ejection Method (POEM). The XRD pattern of the particles shows only broad peaks without any crystalline peak. A bright field TEM image of the particles and the selected area diffraction patterns shows only halo patterns that indicate fully amorphous phase. DSC curve shows that supercooled liquid region was &Delta;T=48 K and a TTT curve can be constructed by isothermal DSC.

    DOI: 10.2320/jinstmet.72.686

  • Soft magnetic Fe-based metallic glasses prepared by fluxing and water-quenching Reviewed

    Tokujiro Yamamoto, Noriharu Yodoshi, Teruo Bitoh, Akihiro Makino, Akihisa Inoue

    REVIEWS ON ADVANCED MATERIALS SCIENCE   18 ( 2 )   126 - 130   2008.6

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    [(Fe(0.5)Co(0.5))(0.75)B(0.20)Si(0.05)](96)Nb(4) soft magnetic bulk metallic glasses were prepared by fluxing and water-quenching in a silica tube. Dimension of the bulk metallic glass specimens was up to 7.7 mm in diameter, which is about 1.5 times larger than those prepared by Cu mold-casting. The critical cooling rate of [(Fe(0.5)Co(0.5))(0.75)B(0.20)Si(0.05)](96)Nb(4) alloys with fluxing for forming a metallic glass phase was 150-170 K/s, which was considerably smaller than that without fluxing. Saturation magnetization was 1.13 T, and coercivity was lower than 20 A/m. Fluxing suppresses heterogeneous nucleation by isolating the nucleation sites from the molten alloys and improves their glass-forming ability.

  • Effects of additional elements on microstructures of Zr-based metallic glass ribbons Reviewed

    Tokujiro Yamamoto, Noriharu Yodoshi, Hisamichi Kimura, Akihisa Inoue

    THERMEC 2006, PTS 1-5   539-543   2000 - +   2007.3

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    Effects of Fe, Co and Al addition to Zr55Al10Ni5Cu30 and Zr70Cu30 metallic glass ribbons were studied. 20 at.% of Fe addition prevented Zr55Al10Ni5Cu30 molten alloys from being supercooled and resulted in nanocrystallization, while Zr55Al10Ni5Cu30 alloys containing 20 at.% Co could be quenched into a supercooled liquid region. Fe addition also degraded Zr70Cu30 metallic glass, while Al addition improved both glass phase stability and mechanical properties. Degradation of Zr-based metallic glass by Fe addition originates in the large negative enthalpy of mixing Fe with Cu.

    DOI: 10.4028/www.scientific.net/MSF.539-543.2000

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Books

  • 3. 新塑性加工技術シリーズ 「粉末成形 −粉末加工による機能と形状のつくり込み-」

    吉年規治(Role:Joint author)

    一般社団法人 日本塑性加工学会  2018.12 

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MISC

  • ガスアトマイズ粉末の気孔形成メカニズムの検討

    島村壮, 吉年規治, 工藤健太郎, 品川一成, 櫻井郁也

    粉体粉末冶金協会講演大会(Web)   2024   2024

  • 焼結-圧縮試験による純Ni粉末成形体の焼結特性評価

    工藤健太郎, 吉年規治, 品川一成

    塑性加工春季講演会講演論文集(CD-ROM)   2024   2024   ISSN:2436-6269

  • プレミックス焼結法によるハイエントロピー合金の作製とその機械的特性

    吉年規治, 工藤健太郎, 品川一成

    日本金属学会講演大会(Web)   174th   2024

  • NiAs型(Cr,Fe)S化合物の相状態・磁気特性に及ぼす熱処理温度依存性

    梅津理恵, 宮川正人, 千星聡, 吉年規治, 真砂啓, 川人洋介, 福島鉄也, 赤井久純

    日本金属学会講演大会(Web)   2023.4

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  • 異周速粉末圧延の有限要素解析と板状粒子配向挙動のシミュレーション

    秋武幸汰, 工藤健太郎, 吉年規治, 品川一成

    塑性加工春季講演会講演論文集(CD-ROM)   2023.4

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  • マイクロデバイス応用を目指した薄板・薄膜磁歪材料の作製とその磁気特性

    伊高健治, 山浦真一, 吉年規治, 古屋泰文, 千葉晶彦

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2023.4

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    The magnetic property of thin-film magnetostriction materials towards micro device application

  • シンクロトロン光X線CTによるガスアトマイズ粉末評価と気孔成形因子の検討

    吉年規治, 小城原尭也, 工藤健太郎, 品川一成, 櫻井郁也, 佐藤充孝, 正橋直哉, 吉川穣, 伊藤桂介

    粉体粉末冶金協会講演大会(Web)   2023.4

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  • シンクロトロン光X線CTによるガスアトマイズ粉末の3次元形状および気孔量の評価

    小城原尭也, 吉年規治, 工藤健太郎, 品川一成, 櫻井郁也, 佐藤充孝, 正橋直哉, 吉川穣, 伊藤桂介

    粉体粉末冶金協会講演大会(Web)   2023.4

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  • NiAs型(Cr,Fe)S化合物の相状態・磁気特性に及ぼす熱処理温度依存性

    梅津理恵, 宮川正人, 千星聡, 吉年規治, 真砂啓, 川人洋介, 福島鉄也, 赤井久純

    日本金属学会講演大会(Web)   172nd   2023.4

  • 異周速粉末圧延の有限要素解析と板状粒子配向挙動のシミュレーション

    秋武幸汰, 工藤健太郎, 吉年規治, 品川一成

    塑性加工春季講演会講演論文集(CD-ROM)   2023   2023.4   ISSN:2436-6269

  • The magnetic property of thin-film magnetostriction materials towards micro device application

    伊高健治, 山浦真一, 吉年規治, 古屋泰文, 千葉晶彦

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2022   2023.4

  • シンクロトロン光X線CTによるガスアトマイズ粉末評価と気孔成形因子の検討

    吉年規治, 小城原尭也, 工藤健太郎, 品川一成, 櫻井郁也, 佐藤充孝, 正橋直哉, 吉川穣, 伊藤桂介

    粉体粉末冶金協会講演大会(Web)   2023   2023.4

  • シンクロトロン光X線CTによるガスアトマイズ粉末の3次元形状および気孔量の評価

    小城原尭也, 吉年規治, 工藤健太郎, 品川一成, 櫻井郁也, 佐藤充孝, 正橋直哉, 吉川穣, 伊藤桂介

    粉体粉末冶金協会講演大会(Web)   2023   2023.4

  • Evaluation and reduction of porosity in gas-atomized metal powders

    吉年規治, 小城原尭也, 正橋直哉

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2022   2023

  • 異周速粉末圧延の有限要素解析と板状粒子配向挙動のシミュレーション 第2報 異径ロールの影響

    秋武幸汰, 工藤健太郎, 吉年規治, 品川一成

    塑性加工連合講演会講演論文集(CD-ROM)   74th   2023

  • Fe合金基複合材料の磁歪特性支配因子の理解

    栗田大樹, 吉年規治, 菊池将一

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2022.4

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    Dominant factor evaluation of magnetostrictive properties on Fe alloy-based composite materials

  • 金属被覆セラミックス粒子による機能性材料の創成

    鈴木庸久, 藤井達也, 吉年規治, 原田晃一

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2022.4

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    Development of functional ceramics sintered using metal-coated ceramics powders

  • 酸化チタンナノワイヤーの形状とイオン置換の制御

    桑野聡子, 梅本康平, 江崎雅公, 遠藤宏大, 遠藤寛明, 太田遥, 藤田健希, 横山冴生, 大村和世, 成田一生, 野村明子, 吉年規治

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2022.4

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    Control of the morphology and ion substitution of titanium oxide nanowires

  • 段付き圧粉体の焼結変形とクラック発生のその場観察

    工藤健太郎, 与那覇舜, 吉年規治, 品川一成

    粉体粉末冶金協会講演大会(Web)   2022.4

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  • マイクロデバイス応用を目指した薄板・薄膜磁歪材料の作製とその磁気特性

    伊高健治, 山浦真一, 吉年規治, 古屋泰文, 千葉晶彦

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2022.4

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    The magnetic property of thin-film magnetostriction materials towards micro device application

  • NiAs型結晶構造を有する(Cr,Fe)S化合物の磁気特性と電子状態

    梅津理恵, 千星聡, 吉年規治, 川人洋介, 赤井久純, 赤井久純

    日本金属学会講演大会(Web)   2022.4

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  • Dominant factor evaluation of magnetostrictive properties on Fe alloy-based composite materials

    栗田大樹, 吉年規治, 菊池将一

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2021   2022.4

  • Development of functional ceramics sintered using metal-coated ceramics powders

    鈴木庸久, 藤井達也, 吉年規治, 原田晃一

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2021   2022.4

  • Control of the morphology and ion substitution of titanium oxide nanowires

    桑野聡子, 梅本康平, 江崎雅公, 遠藤宏大, 遠藤寛明, 太田遥, 藤田健希, 横山冴生, 大村和世, 成田一生, 野村明子, 吉年規治

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2021   2022.4

  • 段付き圧粉体の焼結変形とクラック発生のその場観察

    工藤健太郎, 与那覇舜, 吉年規治, 品川一成

    粉体粉末冶金協会講演大会(Web)   2022   2022.4

  • The magnetic property of thin-film magnetostriction materials towards micro device application

    伊高健治, 山浦真一, 吉年規治, 古屋泰文, 千葉晶彦

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2021   2022.4

  • NiAs型結晶構造を有する(Cr,Fe)S化合物の磁気特性と電子状態

    梅津理恵, 千星聡, 吉年規治, 川人洋介, 赤井久純, 赤井久純

    日本金属学会講演大会(Web)   171st   2022.4

  • カーボンナノチューブ複合めっき皮膜を用いた拡散接合の接合強度評価

    齊藤徹, 鈴木庸久, 藤井達也, 野村光由, 吉年規治

    表面技術協会講演大会講演要旨集   2021.4

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  • 高品位ガスアトマイズ粉末の作製の研究(2)

    吉年規治, 遠藤嵩英, 正橋直哉

    日本金属学会講演大会(Web)   2021.4

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  • ナノ結晶軟磁性材料の磁気特性と微細構造

    大迫明弘, 吉年規治, 中島宏, 石井悠衣, 原田研, 原田研, 森茂生

    日本金属学会講演大会(Web)   2021.4

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  • シンクロトロンX線CTを用いたガスアトマイズ粉末内部の気孔観察と気孔量の低減化

    吉年規治, 遠藤嵩英, 正橋直哉

    粉体粉末冶金協会講演大会(Web)   2021.4

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  • 実学講座「金属材料実験の手引き」について

    大塚 誠, 中村 篤智, 吉年 規治

    まてりあ   2021.2

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    DOI: 10.2320/materia.60.101

  • アモルファス軟磁性合金の結晶化過程と磁区構造

    大迫明弘, 吉年規治, 藤林征宏, 内橋研人, 石井悠衣, 原田研, 森茂生

    日本金属学会講演大会(Web)   2020.4

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  • 高品位ガスアトマイズ粉末の作製の研究

    吉年規治, 遠藤嵩英, 正橋直哉

    日本金属学会講演大会(Web)   2020.4

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  • HMS化合物の組織と熱電性質に及ぼす遷移金属置換とSi含有量の影響

    奥村完太, LEI Liu, 音田哲彦, CHEN Zhong-Chun, 吉年規治, 和田武

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2020.3

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    Effects of transition-metal substitution and Si amount on microstructure and thermoelectric properties of higher manganese silicide compounds

  • 金属3Dプリンティング用機能性金属粒子の開発

    鈴木庸久, 藤井達也, 吉年規治

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2020.3

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    Development of functional metal powders for metal additive manufacturing

  • 酸化チタンナノワイヤーの成長機構について

    桑野 聡子, 佐々木 新之介, 菅原 瑞希, 菊地 翔太, 佐藤 寛佳, 鈴木 仁志, 野村 明子, 大村 和世, 吉年 規治

    日本表面真空学会学術講演会要旨集   2020.3

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    Growth mechanism of titanium oxide nanowire
    <p>For nanostructures produced by reacting titanium-aluminum alloy with an alkaline aqueous solution, in this study, the shapes of porous, membrane, wire, and tubular were confirmed by shape observation and structural analysis with an electron microscope. The purpose of this study is to clarify the growth mechanism of these microstructures and to obtain knowledge about the production conditions that improve the selectivity regarding the shape. This time, we will report on the difference in shape due to the difference in the composition of the base metal and the reaction conditions.</p>

    DOI: 10.14886/jvss.2020.0_112

  • 磁歪バルク合金の薄膜化プロセスおよび,機械加工の援用による高機能積層面創生プロセスの開発

    久慈千栄子, 古屋泰文, 吉年規治, 今野豊彦

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2020.3

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    Development of thin film forming process of magnetostrictive bulk alloy, and development of high functional multilayer surface creation process by mechanical processing

  • 熱プラズマ法による永久磁石材料の合成

    平山悠介, 細川明秀, 高木健太, 吉年規治

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2020.3

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    Preparation of permanent magnet compounds by thermal plasma method

  • TiおよびNi系ナノワイヤーの成長機構の解明

    桑野聡子, 小野文裕, 古関健人, 齋藤雅史, 佐々木新之介, 佐々木隆仁, 菅原瑞貴, 野村凌矢, 岸田宏平, 大村和世, 野村明子, 吉年規治

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2020.3

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    Investigation of growth mechanism for Ti and Ni-nanowire

  • Pd系金属ガラス粒子を用いた粘性流動成形加工による微小部品の作製

    吉年規治, 山田類, 伊佐野はる香, 野村直之, 菊池圭子, 川崎亮

    材料とプロセス(CD-ROM)   2019.9

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  • 単粒子圧縮試験法によるFe系金属ガラス過冷却液体の粘性係数測定とその組成依存性

    吉年規治, 青柳慶真, 山田類, 菊池圭子, 野村直之, 川崎亮

    日本金属学会講演概要(CD-ROM)   2019.9

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  • 無容器急冷凝固プロセスにおける強制核発生機構導入によるナノヘテロ構造制御と高効率軟磁性材料への応用

    吉年規治

    村田学術振興財団年報   2019.6

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    Nano-structural Control by Forced Nucleation Mechanism in Container-less Solidification Process and its Application to Highly Efficient Soft Magnetic Materials

  • TiおよびNi系ナノワイヤーの成長機構の解明

    桑野聡子, 菊地翔太, 紺野恭平, 文堂司, 真舘渉, 渡邉竜也, 大村和世, 野村明子, 吉年規治

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2019.3

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    Investigation of growth mechanism for Ti and Ni-nanowire

  • 金属3Dプリンティング用機能性金属粒子の開発

    鈴木庸久, 藤井達也, 佐々木正太, 佐々木宇宙, 吉年規治

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2019.3

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    Development of functional metal powders for metal additive manufacturing

  • 組織制御による高マンガンシリサイド化合物の熱電性能向上

    小田開, LIU Lei, 音田哲彦, CHEN Zhong-Chun, 吉年規治, 和田武

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2019.3

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    Microstructure and thermoelectric properties of higher manganese silicide compounds

  • 球形金属ガラス粒子の粘性流動成形加工によるマイクロダイヤフラムの作製

    吉年規治, 山田類, 伊佐野はる香, 菊池圭子, 野村直之, 川崎亮

    粉体粉末冶金協会講演大会(Web)   2019.3

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  • ガラス転移点以下の予熱が鉄系金属ガラス粉末の粘性流動成形密度に及ぼす効果

    鴨川知誉, 尾崎由紀子, 吉年規治, 細川裕之, 尾崎公洋

    材料とプロセス(CD-ROM)   2019.3

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  • スモールパンチ試験によるTi6Al4V‐TiB複合材料の破壊靭性評価

    栗田大樹, 坂柳和哉, 吉年規治

    粉体粉末冶金協会講演大会(Web)   2018.11

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    スモールパンチ試験によるTi6Al4V‐TiB複合材料の破壊靭性評価

  • 無容器凝固法による高品位鉄系金属ガラス原料粒子の合成と1粒子の粘性流動加工プロセスによる高精度・高強度マイクロ部品の創製

    吉年規治

    天田財団助成研究成果報告書   2018.10

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    DOI: 10.32163/amadareport.31.0_140

  • アトマイズ粉末を用いた高マンガンシリサイド熱電材料の作製と熱電性質

    小田開, 劉磊, 音田哲彦, 吉年規治, 和田武, 陳中春

    日本金属学会講演概要(CD-ROM)   2018.9

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    アトマイズ粉末を用いた高マンガンシリサイド熱電材料の作製と熱電性質

  • Fe系非晶質単粒子のナノ組織制御と磁気特性評価

    峯岸剛太, 菊池圭子, 野村直之, 川崎亮, 山田類, 吉年規治

    粉体粉末冶金協会講演大会(Web)   2018.9

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    Fe系非晶質単粒子のナノ組織制御と磁気特性評価

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    サブMHzの超音波印加が圧縮過程における金属ガラスの粘性流動におよぼす影響の解析

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    日本複合材料合同会議(Web)   2018.6

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    Microstructure and tensile properties of Ti6Al4V-TiB composite

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    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2018.6

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    Microstructure and thermoelectric properties of higher manganese silicide compounds

  • Fe‐Co‐Si‐B‐P系急冷単分散粒子のナノ結晶化挙動と磁気特性のCo濃度依存性

    峯岸剛太, 菊池圭子, 野村直之, 川崎亮, 吉年規治

    粉体粉末冶金協会講演概要集   2017.11

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    Fe‐Co‐Si‐B‐P系急冷単分散粒子のナノ結晶化挙動と磁気特性のCo濃度依存性

  • 金属ガラスの粘性流動成型加工による感圧素子用ダイヤフラムの作製

    青柳慶真, 菊池圭子, 野村直之, 川崎亮, 吉年規治

    粉体粉末冶金協会講演概要集   2017.11

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    金属ガラスの粘性流動成型加工による感圧素子用ダイヤフラムの作製

  • Fe‐Si‐B‐P‐(Cu)系急冷単分散粒子のナノ結晶化挙動と磁気特性

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    材料とプロセス(CD-ROM)   2017.8

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    Fe‐Si‐B‐P‐(Cu)系急冷単分散粒子のナノ結晶化挙動と磁気特性

  • 鉄系金属ガラス粒子マイクロ鍛造加工の粘弾性解析

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    材料とプロセス(CD-ROM)   2017.8

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    鉄系金属ガラス粒子マイクロ鍛造加工の粘弾性解析

  • 組織制御による高マンガンシリサイド化合物の熱電性能向上

    CHEN Zhong‐Chun, 小田開, WU Lijie, 音田哲彦, 吉年規治, 和田武

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書(CD-ROM)   2017.7

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    Microstructure and thermoelectric properties of higher manganese silicide compounds

  • FeCoSiBPアモルファス単粒子のナノ結晶化と磁気特性評価

    吉年規治, 山田類, 峯岸剛太, 菊池圭子, 野村直之, 川崎亮

    粉体粉末冶金協会講演概要集   2017.5

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    FeCoSiBPアモルファス単粒子のナノ結晶化と磁気特性評価

  • 金属ガラス単分散球形粒子の作製とマイクロ粘性流動加工

    川崎 亮, 吉年 規治

    山陽特殊製鋼技報   2017.5

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    Preparation of monodisperse spherical particles of a metallic glass and application for micro-viscous flow processing

  • FeCoSiBNb系単分散粒子の過冷却液体の粘性係数とその組成依存性

    青柳慶真, 菊池圭子, 野村直之, 川崎亮, 山田類, 吉年規治

    粉体粉末冶金協会講演概要集   2016.11

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    FeCoSiBNb系単分散粒子の過冷却液体の粘性係数とその組成依存性

  • FeSiBP系単分散粒子の磁気特性とその組成依存性

    大川舜平, 菊池圭子, 野村直之, 川崎亮, 山田類, 吉年規治, 牧野彰宏

    粉体粉末冶金協会講演概要集   2016.11

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    FeSiBP系単分散粒子の磁気特性とその組成依存性

  • Fe76Si9B10P5金属ガラス単分散粒子の粘性流動特性および磁気特性

    吉年規治, 山田類, 大川舜平, 野村直之, 菊池圭子, 川崎亮

    材料とプロセス(CD-ROM)   2016.9

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    Fe76Si9B10P5金属ガラス単分散粒子の粘性流動特性および磁気特性

  • 粘性流動を利用したFe系金属ガラスマイクロギアの創製プロセスの検討

    山田類, 吉年規治, 川崎亮

    材料とプロセス(CD-ROM)   2016.9

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    粘性流動を利用したFe系金属ガラスマイクロギアの創製プロセスの検討

  • Zr基金属ガラスを用いた歯科用インプラントの開発と組織内安定性の評価

    山本照子, 清流正弘, 井田裕人, 土江雄治朗, 古原忠, 吉年規治

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    Development and histological behavior of Zr-based metallic glasses for dental implant

  • 結晶粒微細化と配向化の同時実現による熱電材料の高性能化

    CHEN Zhong‐Chun, WANG Zhi‐Lei, 竹田尚輝, 赤尾尚洋, 音田哲彦, 吉年規治, 和田武

    東北大学金属材料研究所新素材共同研究開発センター共同利用研究報告書   2016.6

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    Performance improvement of thermoelectric materials by grain refinement and preferred orientation

  • FeSiBP系アモルファス単分散粒子のナノ結晶化挙動と磁気特性評価

    大川舜平, 川崎亮, 山田類, 吉年規治, 牧野彰宏

    粉体粉末冶金協会講演概要集   2016.5

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    FeSiBP系アモルファス単分散粒子のナノ結晶化挙動と磁気特性評価

  • Fe76Si9B10P5金属ガラスの粘性係数の温度依存性

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    粉体粉末冶金協会講演概要集   2015.11

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    Fe76Si9B10P5金属ガラスの粘性係数の温度依存性

  • FeSiBP(Cu)アモルファス単分散粒子の結晶化挙動と磁気特性評価

    大川舜平, 川崎亮, 山田類, 吉年規治, 牧野彰宏

    粉体粉末冶金協会講演概要集   2015.11

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    FeSiBP(Cu)アモルファス単分散粒子の結晶化挙動と磁気特性評価

  • Fe76Si9B10P5単分散金属ガラス粒子作製と臨界冷却速度

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    材料とプロセス(CD-ROM)   2015.9

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    Fe76Si9B10P5単分散金属ガラス粒子作製と臨界冷却速度

  • FePtBPCu系α‐Fe/L10FePtナノコンポジット半硬磁性材料の創製

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    日本金属学会講演概要(CD-ROM)   2015.3

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    FePtBPCu系α‐Fe/L10FePtナノコンポジット半硬磁性材料の創製

  • 微粉末落下式高速熱処理法による鉄系非晶質粉末の熱処理と組織制御

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    粉体粉末冶金協会講演概要集   2014.10

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    微粉末落下式高速熱処理法による鉄系非晶質粉末の熱処理と組織制御

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    粉体粉末冶金協会講演概要集   2014.10

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    無容器凝固プロセスによるFe76Si9B10P5のガラス形成能評価と臨界冷却速度

  • 微小球形粒子を用いたFe系金属ガラスマイクロ部品の創製

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    日本金属学会講演概要(CD-ROM)   2014.3

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    微小球形粒子を用いたFe系金属ガラスマイクロ部品の創製

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    日本学術会議材料工学連合講演会講演論文集   2013.11

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    新規金属ガラスマイクロ部品作製法の提案及びFe系金属ガラスマイクロギアの作製

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    粉体粉末冶金協会講演概要集   2013.5

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    鉄系金属ガラス単分散液滴のin‐situ接合

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    日本金属学会講演概要(CD-ROM)   2013.3

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    単粒子圧縮試験によるFe系金属ガラスの応力緩和挙動および緩和機構の検討

  • Fe系非晶質粉末の液相焼結

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    粉体粉末冶金協会講演概要集   2012.11

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    Fe系非晶質粉末の液相焼結

  • 圧力付加液相焼結法によるFe系金属ガラス粉末の緻密化

    佐野謙太, 吉年規治, 川崎亮

    日本金属学会東北支部研究発表大会予稿集   2012.11

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    圧力付加液相焼結法によるFe系金属ガラス粉末の緻密化

  • Fe系金属ガラス過冷却液体の応力緩和挙動

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    日本金属学会東北支部研究発表大会予稿集   2012.11

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    Fe系金属ガラス過冷却液体の応力緩和挙動

  • Fe系金属ガラス単分散液滴のin‐situ接合

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    日本金属学会東北支部研究発表大会予稿集   2012.11

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    Fe系金属ガラス単分散液滴のin‐situ接合

  • [(Fe_XCo_<1-X>)_<0.75>B_<0.2>Si_<0.05>]_<96>Nb_4金属ガラス単分散粒子の臨界冷却速度とその組成依存性

    福江 正浩, 吉年 規治, 山田 類, 川崎 亮

    日本金屬學會誌   2012.10

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    Critical Cooling Rates of Mono-Sized Fe-Based Glassy Particles in [(Fe_XCo_<1-X>)_<0.75>B_<0.2>Si_<0.05>]_<96>Nb_4 System

  • 鉄系金属ガラス単分散粒子のマイクロ粘性流動加工

    吉年規治, 山田類, 川崎亮

    材料とプロセス(CD-ROM)   2012.9

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    鉄系金属ガラス単分散粒子のマイクロ粘性流動加工

  • Compaction Behavior of Iron Powder in Low Pressure Region Reviewed

    Yoshihiro Ito, Eiichiro Yoshikawa, Akira Kawasaki, Noriharu Yodoshi

    Proceedings of Powder Metallurgy World Congress (PM2012)   2012.9

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    Compaction Behavior of Iron Powder in Low Pressure Region

  • SPS法によるFe‐Co系金属ガラス粉末の固化成形

    川崎亮, 吉年規治

    東北大学金属材料研究所金属ガラス総合研究センター共同利用研究報告書   2012.6

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    SPS法によるFe‐Co系金属ガラス粉末の固化成形

  • Fe系金属ガラスの応力緩和挙動ならびに粘性流動加工時の最適な加工条件の検討

    山田類, 吉年規治, 川崎亮

    粉体粉末冶金協会講演概要集   2012.5

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    Fe系金属ガラスの応力緩和挙動ならびに粘性流動加工時の最適な加工条件の検討

  • 金属ガラス固化成形時の液相成分が再配列に及ぼす影響

    佐野謙太, 森田直志, 吉年規治, 川崎亮

    粉体粉末冶金協会講演概要集   2012.5

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    金属ガラス固化成形時の液相成分が再配列に及ぼす影響

  • Fe系金属ガラス単分散粒子のマイクロ粘性流動と結晶化挙動

    寺島寛人, 山田類, 吉年規治, 川崎亮

    日本金属学会東北支部研究発表大会予稿集   2011.11

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    Fe系金属ガラス単分散粒子のマイクロ粘性流動と結晶化挙動

  • 圧力付加液相焼結法によるFe系金属ガラス粉末の緻密化

    菊田陽一, 佐野謙太, 吉年規治, 川崎亮

    日本金属学会東北支部研究発表大会予稿集   2011.11

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    圧力付加液相焼結法によるFe系金属ガラス粉末の緻密化

  • Fe系金属ガラス無容器凝固液滴のin‐situ接合

    吉年規治, 福江正浩, 山田類, 川崎亮

    日本金属学会講演概要(CD-ROM)   2011.10

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    Fe系金属ガラス無容器凝固液滴のin‐situ接合

  • 単粒子圧縮試験法によるFe系金属ガラスの応力緩和挙動の検討

    山田類, 吉年規治, 川崎亮

    日本金属学会講演概要(CD-ROM)   2011.10

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    単粒子圧縮試験法によるFe系金属ガラスの応力緩和挙動の検討

  • 微小加圧領域における鉄粉の圧密挙動解析

    吉年規治, 川崎亮, 吉川英一郎, 伊藤義浩

    材料とプロセス(CD-ROM)   2011.9

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    微小加圧領域における鉄粉の圧密挙動解析

  • SPS法によるFe‐Co系金属ガラス粉末の固化成形

    川崎亮, 吉年規治

    東北大学金属材料研究所金属ガラス総合研究センター共同利用研究報告書   2011.6

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    SPS法によるFe‐Co系金属ガラス粉末の固化成形

  • Fe系金属ガラスにおける粘性流動加工が結晶化に及ぼす影響

    寺島寛人, 山田類, 吉年規治, 川崎亮

    粉体粉末冶金協会講演概要集   2011.5

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    Fe系金属ガラスにおける粘性流動加工が結晶化に及ぼす影響

  • 金属ガラス粉末緻密化挙動の粉末冶金的特徴を利用した複合材料の作製

    菊田陽一, 森田直志, 吉年規治, 川崎亮

    粉体粉末冶金協会講演概要集   2011.5

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    金属ガラス粉末緻密化挙動の粉末冶金的特徴を利用した複合材料の作製

  • 単粒子圧縮試験法によるFe系金属ガラスの応力緩和挙動の検討

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    粉体粉末冶金協会講演概要集   2011.5

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    単粒子圧縮試験法によるFe系金属ガラスの応力緩和挙動の検討

  • Fe系金属ガラス粒子のマイクロ粘性流動加工

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    粉体粉末冶金協会講演概要集   2011.5

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    Fe系金属ガラス粒子のマイクロ粘性流動加工

  • 単粒子圧縮試験法によるFe系金属ガラスの応力緩和時間測定及び粘性率の検討

    山田類, 吉年規治, 川崎亮

    日本金属学会講演概要   2011.4

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    単粒子圧縮試験法によるFe系金属ガラスの応力緩和時間測定及び粘性率の検討

  • 無容器凝固法により得られたFe系金属ガラス粒子の粘性流動加工及び結晶化挙動

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    日本金属学会講演概要   2011.4

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    無容器凝固法により得られたFe系金属ガラス粒子の粘性流動加工及び結晶化挙動

  • Fe系金属ガラスにおける粘性流動加工が結晶化に及ぼす影響

    米山太基, 寺島寛人, 山田類, 吉年規治, 川崎亮

    粉体粉末冶金協会講演概要集   2010.11

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    Fe系金属ガラスにおける粘性流動加工が結晶化に及ぼす影響

  • 圧力付加液相焼結法によるFe系金属ガラス粉末の緻密化

    森田直志, 吉年規治, 川崎亮

    日本金属学会東北支部研究発表大会予稿集   2010.11

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    圧力付加液相焼結法によるFe系金属ガラス粉末の緻密化

  • 球形単分散金属ガラス微粒子を用いたマイクロ粘性流動加工

    吉年規治, 川崎亮, 山田類

    粉体粉末冶金協会講演概要集   2010.11

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    球形単分散金属ガラス微粒子を用いたマイクロ粘性流動加工

  • 単粒子圧縮試験におけるFe系金属ガラス粒子の応力緩和挙動と粘性係数の関係

    山田類, 吉年規治, 川崎亮

    粉体粉末冶金協会講演概要集   2010.11

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    単粒子圧縮試験におけるFe系金属ガラス粒子の応力緩和挙動と粘性係数の関係

  • Fe系金属ガラスにおける粘性流動加工が及ぼす結晶化への影響

    吉年規治, 山田類, 川崎亮

    日本金属学会講演概要   2010.9

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    Fe系金属ガラスにおける粘性流動加工が及ぼす結晶化への影響

  • 粘性流動特性を利用した金属ガラス粉末の緻密化挙動

    吉年規治, 川崎亮, 渡辺龍三

    材料とプロセス(CD-ROM)   2010.9

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    粘性流動特性を利用した金属ガラス粉末の緻密化挙動

  • 単粒子圧縮試験法によるFe系金属ガラスの粘性率測定およびその温度依存性

    山田類, 吉年規治, 川崎亮

    日本金属学会講演概要   2010.9

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    単粒子圧縮試験法によるFe系金属ガラスの粘性率測定およびその温度依存性

  • パルス圧力付加オリフィス噴射法によるFe系金属ガラス単分散粒子の作製および冷却過程の検討

    福江正浩, 山田類, 吉年規治, 川崎亮

    粉体粉末冶金協会講演概要集   2010.5

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    パルス圧力付加オリフィス噴射法によるFe系金属ガラス単分散粒子の作製および冷却過程の検討

  • 粘性流動特性を利用した金属ガラス粉末の緻密化挙動

    吉年規治, 川崎亮, 渡辺龍三

    粉体粉末冶金協会講演概要集   2010.5

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    粘性流動特性を利用した金属ガラス粉末の緻密化挙動

  • 圧力付加液相焼結法によるFe系金属ガラス粉末の緻密化とその組織

    森田直志, 吉年規治, 川崎亮

    粉体粉末冶金協会講演概要集   2010.5

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    圧力付加液相焼結法によるFe系金属ガラス粉末の緻密化とその組織

  • 単粒子圧縮試験法によるFe系金属ガラスの粘性率測定およびその温度依存性

    山田類, 吉年規治, 川崎亮

    粉体粉末冶金協会講演概要集   2010.5

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    単粒子圧縮試験法によるFe系金属ガラスの粘性率測定およびその温度依存性

  • Fe系金属ガラスにおける粘性流動加工が結晶化に及ぼす影響

    米山太基, 寺島寛人, 山田類, 吉年規治, 川崎亮

    日本金属学会東北支部研究発表大会予稿集   2010.4

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    Fe系金属ガラスにおける粘性流動加工が結晶化に及ぼす影響

  • Fe系金属ガラス単分散粒子の作製と特性評価

    福江正浩, 山田類, 吉年規治, 川崎亮

    日本金属学会東北支部研究発表大会予稿集   2010.4

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    Fe系金属ガラス単分散粒子の作製と特性評価

  • 単粒子圧縮試験法によるFe系金属ガラスの粘性率およびその温度依存性

    山田類, 吉年規治, 川崎亮

    日本金属学会東北支部研究発表大会講演概要集   2009.11

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    単粒子圧縮試験法によるFe系金属ガラスの粘性率およびその温度依存性

  • 単粒子圧縮試験法によるFe系金属ガラスの粘性率およびその温度依存性

    山田類, 吉年規治, 川崎亮

    粉体粉末冶金協会講演概要集   2009.10

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    単粒子圧縮試験法によるFe系金属ガラスの粘性率およびその温度依存性

  • 圧力付加液相焼結法によるFe系金属ガラス粉末の緻密化とその組織

    森田直志, 吉年規治, 川崎亮

    粉体粉末冶金協会講演概要集   2009.10

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    圧力付加液相焼結法によるFe系金属ガラス粉末の緻密化とその組織

  • 単分散Fe系金属ガラスPOEM粒子の粘性流動加工による微小部品の作製

    吉年規治, 川崎亮, 柳本勝

    材料とプロセス(CD-ROM)   2009.9

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    単分散Fe系金属ガラスPOEM粒子の粘性流動加工による微小部品の作製

  • パルス圧力付加オリフィス噴射法による単分散Fe系金属ガラス粒子の作製と評価

    福江正浩, 董偉, 吉年規治, 川崎亮, 三浦彩子

    粉体粉末冶金協会講演概要集   2009.6

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    パルス圧力付加オリフィス噴射法による単分散Fe系金属ガラス粒子の作製と評価

  • 圧力付加液相焼結法により作製したFe系金属ガラス‐Pd系金属ガラス複合材料の機械的特性評価

    森田直志, 吉年規治, 川崎亮

    粉体粉末冶金協会講演概要集   2009.6

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    圧力付加液相焼結法により作製したFe系金属ガラス‐Pd系金属ガラス複合材料の機械的特性評価

  • 単分散Fe系金属ガラスPOEM粒子の粘性流動加工による微小部品の作製

    吉年規治, 董偉, 川崎亮, 柳本勝

    粉体粉末冶金協会講演概要集   2009.6

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    単分散Fe系金属ガラスPOEM粒子の粘性流動加工による微小部品の作製

  • マイクロホットプレス単粒子圧縮試験による金属ガラスの粘性率の推定

    山田類, 吉年規治, 川崎亮, 渡辺龍三

    粉体粉末冶金協会講演概要集   2009.6

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    マイクロホットプレス単粒子圧縮試験による金属ガラスの粘性率の推定

  • 粘性流動プロセスを利用した金属ガラス粉末の緻密化挙動

    吉年規治, 山田類, 川崎亮, 渡辺龍三

    日本金属学会講演概要   2009.3

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    粘性流動プロセスを利用した金属ガラス粉末の緻密化挙動

  • パルス圧力付加オリフィス噴射法による球形単分散Fe系金属ガラス粒子の作製に及ぼす冷却速度の影響

    董偉, 三浦彩子, 吉年規治, 川崎亮, 柳本勝

    粉体粉末冶金協会講演概要集   2008.11

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    パルス圧力付加オリフィス噴射法による球形単分散Fe系金属ガラス粒子の作製に及ぼす冷却速度の影響

  • 圧力付加液相焼結法によるFe系金属ガラス粉末の固化成形

    吉年規治, 山田類, 川崎亮

    粉体粉末冶金協会講演概要集   2008.11

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    圧力付加液相焼結法によるFe系金属ガラス粉末の固化成形

  • パルス圧力付加オリフィス噴射法により作製したFe系金属ガラス単分散粒子の元素分布の調査

    三浦彩子, 吉年規治, 董偉, 川崎亮

    粉体粉末冶金協会講演概要集   2008.11

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    パルス圧力付加オリフィス噴射法により作製したFe系金属ガラス単分散粒子の元素分布の調査

  • パルス圧力付加オリフィス噴射法による球形単分散Fe系金属ガラス粒子の作製及び評価

    董偉, 三浦彩子, 吉年規治, 川崎亮, 柳本勝

    日本金属学会講演概要   2008.9

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    パルス圧力付加オリフィス噴射法による球形単分散Fe系金属ガラス粒子の作製及び評価

  • マイクロホットプレス単粒子圧縮による金属ガラスの粘性率の推定

    吉年規治, 川崎亮, 渡辺龍三

    日本金属学会講演概要   2008.9

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    マイクロホットプレス単粒子圧縮による金属ガラスの粘性率の推定

  • Fe系金属ガラス粉末の作製とSPS法による固化成形

    吉年規治, 川崎亮

    粉体粉末冶金協会講演概要集   2008.5

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    Fe系金属ガラス粉末の作製とSPS法による固化成形

  • パルス圧力付加オリフィス噴射法による球形単分散Fe系金属ガラス粒子の作製に及ぼすパラメーターの影響

    董偉, 三浦彩子, 吉年規治, 川崎亮, 柳本勝

    粉体粉末冶金協会講演概要集   2008.5

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    パルス圧力付加オリフィス噴射法による球形単分散Fe系金属ガラス粒子の作製に及ぼすパラメーターの影響

  • パルス圧力付加オリフィス噴射法による球形単分散Fe系金属ガラス粒子の作製

    吉年規治, 三浦彩子, 董偉, 川崎亮

    日本金属学会講演概要   2008.3

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    パルス圧力付加オリフィス噴射法による球形単分散Fe系金属ガラス粒子の作製

  • パルス圧力付加オリフィス噴射法による球形単分散Fe系金属ガラス粒子の作製

    三浦彩子, 吉年規治, 董偉, 川崎亮, 柳本勝

    粉体粉末冶金協会講演概要集   2007.11

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    パルス圧力付加オリフィス噴射法による球形単分散Fe系金属ガラス粒子の作製

  • Fe基バルク金属ガラスに及ぼすフラックス処理の影響

    吉年規治, 山本篤史郎, 牧野彰宏, 井上明久, 尾藤輝夫

    日本金属学会講演概要   2006.9

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    Fe基バルク金属ガラスに及ぼすフラックス処理の影響

  • Al微量添加によるZr70Cu30液体急冷リボン材の構造ならびに組織変化

    山本篤史郎, 吉年規治, 木村久道, 井上明久

    日本金属学会講演概要   2006.3

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    Al微量添加によるZr70Cu30液体急冷リボン材の構造ならびに組織変化

  • Criterion for the Full Densification in Hot Pressing of Metallic Glass Powders Reviewed

    Ryuzo Watanabe, Noriharu Yodoshi, Akira Kawasaki

    Proceedings of Powder Metallurgy World Congress, PM2012   1900

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    Criterion for the Full Densification in Hot Pressing of Metallic Glass Powders

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Industrial property rights

Patent   Number of applications: 3   Number of registrations: 5
Utility model   Number of applications: 0   Number of registrations: 0
Design   Number of applications: 0   Number of registrations: 0
Trademark   Number of applications: 0   Number of registrations: 0

Professional Memberships

  • 日本材料学会

  • 日本鉄鋼協会

  • 粉体粉末冶金協会

  • 日本金属学会

  • 日本機械学会

Research Projects

  • 気液界面の薄い熱物質拡散層が律速する液体金属微粒子の分裂と凝固のダイナミクス

    Grant number:24K00806  2024.4 - 2027.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    井上 智博, 王 振英, 吉年 規治

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    Grant type:Scientific research funding

    金属積層造形に不可欠な高機能微粒子の開発が世界的に活発に進められている.液体金属に,超音速気流を衝突・分裂・凝固させる微粒子製造プロセスは,これまで熱流体工学の未踏領域であり,金属微粒子の界面特性を制御設計するために必要な,液体金属の動的な熱流動に関する知見が乏しい.本研究は,物理的・化学的に特異な薄い気液界面層が律速する,液体金属の分裂ダイナミクスと粒子トポロジー形成を対象に,複合的可視化とX線分析を通じて,金属微粒子製造プロセスを流体工学的に理解する.

    CiNii Research

  • ガスアトマイズ粉末の内部気孔抑制と噴霧ガスとの反応を積極利用した新奇な粉末の創製

    Grant number:24K01218  2024.4 - 2027.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    吉年 規治, 櫻井 郁也

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    Grant type:Scientific research funding

    本研究は工業的に応用が拡がるガスアトマイズ粉末の高品位化を目指して,放射光X線CT観察により内部気孔について詳細に観察するとともにその形成メカニズムを明らかにし,内部気孔を抑制するためのプロセス開発を行なうことを目的としている.また,アトマイズプロセスを利用した特異な非平衡構造および組織を有する粉末を創製することに挑戦する.

    CiNii Research

  • 新規反強磁性型ハーフメタル物質の創製と物質設計指針の確立

    Grant number:22H00287  2022 - 2025

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    梅津 理恵, 千星 聡, 福島 鉄也, 吉年 規治, 赤井 久純, 真砂 啓

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

    スピントロニクスの研究分野では、ハーフメタル型の電子状態を有する強磁性体から、反強磁性体(=完全補償型フェリ磁性体)を用いた電子デバイスの研究へと移行している。本研究では、第一原理計算に基づく物質予測により当研究グループが世界で3例目、カルコゲナイド化合物では世界で初めての例となる候補物質を発見したことにより、関連物質において新規反強磁性型ハーフメタル物質の探索を行うと同時に電子状態の直接観測を行い、さらには反強磁性型ハーフメタル物質の普遍的な物質設計指針を確立することを目的としている。

    CiNii Research

  • Elucidation of the pore formation mechanism in gas-atomized powders

    Grant number:21H01663  2021 - 2023

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Yodoshi Noriharu

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    Authorship:Principal investigator  Grant type:Scientific research funding

    In this research project, we focused on elucidating the pore formation mechanism in gas-atomized powders and developing a technology to suppress them. We were able to observe pores of the order of several micrometers in various gas-atomized metal powders using synchrotron radiation X-ray CT under optimized observation conditions. By developing an exclusive image analysis system, we acquired the pore morphology profiles for each alloy and evaluated the pore size distribution and morphology of the various alloy powders. In addition, we investigated the factors that led to the formation of internal pores based on the data obtained.
    We also proposed the use of hydrogen-mixed gas as the atomizing gas and experimentally demonstrated that the volume fraction of internal pores could be significantly reduced in various types of alloy powders.

    CiNii Research

  • 無容器急冷凝固過程中のプロセス的強制核発生によるナノ組織制御

    Grant number:18K04767  2018 - 2020

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 無容器凝固プロセスを用いた鉄系非晶質材料の組織制御指針の構築

    Grant number:15K18244  2015 - 2017

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists(A)or(B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 自己組織化を用いた高強度・高靭性Fe基バルク・ヘテロ金属ガラスの創成

    Grant number:23246119  2011 - 2014

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

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Class subject

  • 機械工学実験第一(AーⅡ,B-Ⅰ)

    2024.4 - 2024.9   First semester

  • (IUPE)Mechanical and Aerospace Engineering Experiments I

    2024.4 - 2024.9   First semester

  • 機械工学実験第一(A-Ⅰ)

    2024.4 - 2024.9   First semester

  • 機械工学実験第一(BーⅡ)

    2024.4 - 2024.9   First semester

  • 機械製作法Ⅰ

    2024.4 - 2024.6   Spring quarter

  • 専門英語

    2023.10 - 2024.3   Second semester

  • 加工プロセス演習

    2023.10 - 2024.3   Second semester

  • 機械要素設計製図II(B)

    2023.6 - 2023.8   Summer quarter

  • 機械要素設計製図Ⅱ(B)

    2023.6 - 2023.8   Summer quarter

  • (IUPE)Mechanical and Aerospace Engineering Experiments I

    2023.4 - 2023.9   First semester

  • 材料加工学

    2023.4 - 2023.9   First semester

  • 機械工学実験第一(A-Ⅰ)

    2023.4 - 2023.9   First semester

  • 機械工学実験第一(BーⅡ)

    2023.4 - 2023.9   First semester

  • 機械工学実験第一(AーⅡ,B-Ⅰ)

    2023.4 - 2023.9   First semester

  • 機械製作法I

    2023.4 - 2023.6   Spring quarter

  • 機械製作法Ⅰ

    2022.12 - 2023.2   Winter quarter

  • 専門英語

    2022.10 - 2023.3   Second semester

  • 加工プロセス演習

    2022.10 - 2023.3   Second semester

  • 材料加工学

    2022.4 - 2022.9   First semester

  • 機械要素設計製図Ⅱ(B)

    2022.4 - 2022.6   Spring quarter

  • 機械製作法Ⅰ

    2021.12 - 2022.2   Winter quarter

  • 機械要素設計製図II(B)

    2025.6 - 2025.8   Summer quarter

  • 機械製作法I(A,B)

    2025.4 - 2025.6   Spring quarter

  • 機械要素設計製図II(B)

    2024.6 - 2024.8   Summer quarter

  • (IUPE)Mechanical and Aerospace Engineering Experiments I

    2024.4 - 2024.9   First semester

  • 機械工学実験第一(BーⅡ)

    2024.4 - 2024.9   First semester

  • 機械工学実験第一(BーⅡ)

    2024.4 - 2024.9   First semester

  • 機械工学実験第一(A-Ⅰ)

    2024.4 - 2024.9   First semester

  • 機械工学実験第一(A-Ⅰ)

    2024.4 - 2024.9   First semester

  • 機械工学実験第一(AーⅡ,B-Ⅰ)

    2024.4 - 2024.9   First semester

  • 機械工学実験第一(AーⅡ,B-Ⅰ)

    2024.4 - 2024.9   First semester

  • 機械製作法I(A,B)

    2024.4 - 2024.6   Spring quarter

▼display all

FD Participation

  • 2023.11   Role:Participation   Title:GakuNin RDMデータ活用セミナー : これからの研究データ管理を探る

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2022.4   Role:Participation   Title:令和4年度 第1回全学FD(新任教員の研修)The 1st All-University FD (training for new faculty members) in FY2022

    Organizer:University-wide

Visiting, concurrent, or part-time lecturers at other universities, institutions, etc.

  • 2023  東北大学・金属材料研究所  Classification:Affiliate faculty  Domestic/International Classification:Japan 

Other educational activity and Special note

  • 2023  Class Teacher  学部

  • 2022  Class Teacher  学部