九州大学-研究者情報 [赤嶺大志 (助教) 総合理工学研究院物質科学部門]

形状記憶合金の微細構造解析および相変態機構解明
キーワード：相変態、形状記憶合金、チタン合金
2017.04～2024.03.

走査電子顕微鏡による強磁性/強誘電ドメイン解析
キーワード：走査電子顕微鏡、強磁性体、強誘電体
2017.04～2020.03.

主要原著論文

1.	Akira Heima, Yuri Shinohara, Hiroshi Akamine, Minoru Nishida, Tomonori Inamura, Peculiar martensitic microstructure and dislocation accumulation behavior in Ti-Ni-Cu shape memory alloys almost satisfying the triplet condition, Acta Materialia, 269, 119823, 2024.03.
2.	Masaru Itakura, Hiroki Kontani, Hiroshi Akamine, Kazumasa Fujimura, Takahiko Iriyama, Coercivity saturation in Nd-Fe-B sintered magnets treated by grain boundary diffusion process of Tb-Ni-Al alloy, Journal of Magnetism and Magnetic Materials, 10.1016/j.jmmm.2023.171698, 591, 171698, 2024.02.
3.	Zheyuan Liang, Kakeru Ninomiya, Hiroshi Akamine, Ryotaro Arai, Sumio Kise, Minoru Nishida, Maiko Nishibori, X-ray absorption spectroscopy study of the local atomic structure in a ductile Cu-Al-Mn shape memory alloy, Materialia, 10.1016/j.mtla.2023.101918, 101918, 2023.09.
4.	A. S. K. Mohammed, R. Sidharth, W. Abuzaid, H. Akamine, M. Nishida, H. Sehitoglu, Orientation Relationships in FeMnNiAl Governed by Martensitic Substructure, Shape Memory and Superelasticity, 10.1007/s40830-023-00458-6, 2023.08.
5.	Hiroshi Akamine, Alimzhan Kalbekov, Takumi Higashizono, Mitsuhiro Matsuda, Satoshi Hata, Minoru Nishida, Hydrogen-induced phase with martensitic-like characteristics in Ti-Ni shape memory alloys, Journal of Alloys and Compounds, 10.1016/j.jallcom.2023.171470, 965, 171470, 2023.07, It has been reported that functional and mechanical properties of Ti-Ni shape memory alloys could be degraded by hydrogen absorption. Many studies have indicated the formation of a hardened layer on the surface in hydrogen-absorbed Ti-Ni alloys. However, the underlying microstructural features and their impact on the functional and mechanical properties remain unclear. In the present study, ex situ and in situ electron microscopy characterizations of the high-hardness layer in a hydrogen-charged Ti-Ni alloy were performed for the first time. Electron diffraction and atomic resolution imaging revealed that the hardened layers have an orthorhombic structure with a four-layer stacking sequence and a martensitic-like crystallographic nature such as lattice correspondence including 12 variants of the orthorhombic phase against each orientation of the parent cubic (B2) phase. In situ and ex situ observations in an electron microscope confirmed that the orthorhombic phase undergoes athermal transformation upon cooling and stress- and/or strain-induced transformation upon deformation, which further characterizes the martensitic-like nature of this phase. The effect of hydrogen on the original phase transformation from the cubic (B2) to the monoclinic (B19′) structure is also discussed..
6.	M. Matsuda, N. Maeda, K. Onaka, H. Akamine, M. Nishida, Effect of Hf on the lattice invariant shear and self-accommodation of martensite in Ti–Ni–Hf alloys, Journal of Materials Science, 10.1007/s10853-023-08707-w, 58, 10896, 2023.07.
7.	H. Akamine, A. Heima, Y. Soejima, M. Mitsuhara, T. Inamura, M. Nishida, Where and when are dislocations induced by thermal cycling in Ti–Ni shape memory alloys?, Acta Materialia, 244, 118588, 2023.01, Systematic experiments were performed to determine where and when dislocations are induced during the thermal cycling of Ti–Ni shape memory alloys. The decrease in transformation temperatures upon thermal cycling became less pronounced with increasing Ni concentration, which was supported by the dislocation densities estimated from scanning transmission electron microscopy observations. The arrangement of transformation-induced dislocations after the 1st thermal cycle reproduced the self-accommodation structure of B19ʹ martensite. Three-dimensional visualization revealed that the complex spiral appearance of the dislocations after the 1st thermal cycle was attributable to the duplicated projection of relatively simple elongated dislocation loops aligned in the depth direction parallel to 〈111〉B2 along {110}B2. No dislocations were observed along the twin boundary in the initially transformed martensite, whereas there were numerous dislocations parallel to the trace of the {110}B2 planes in the martensite formed upon the 2nd thermal cycle. The results suggest that the transformation-induced dislocation loops were generated during the reverse transformation rather than the forward transformation. The possible source site of the transformation-induced dislocations is also discussed..
8.	S. Zhu, H. Akamine, Y. Nagahata, T. Tojigamori, H. Miki, Y. Zhang, T. Tokunaga, S. Iikubo, Microstructure control and its observation of rapid solidification Cu–La alloy for the development of fluoride-ion batteries, Journal of Alloys and Compounds, 930, 167447, 930, 167447, 2023.01.
9.	Francesco Della Porta, Akira Heima, Yuri Shinohara, Hiroshi Akamine, Minoru Nishida, Tomonari Inamura, Triplet condition: A new condition of supercompatibility between martensitic phases, Journal of the Mechanics and Physics of Solids, https://doi.org/10.1016/j.jmps.2022.105050, 169, 105050, 2022.09.
10.	Mitsuhiro Matsuda, Kodai Kiwaki, Hiroshi Akamine, Minoru Nishida, Effect of Hf on the microstructure and martensitic transformation behavior in Ti–Pd–Hf alloy, Journal of Alloys and Compounds, https://doi.org/10.1016/j.jallcom.2022.165491, 917, 165491, 917, 165491, 2022.05.
11.	Masaru Itakura, Koichi Sugiyama, Hiroshi Akamine, Minoru Nishida, Michihide Nakamura, Tetsuhiko Mizoguchi, Takahiko Iriyama, Suppression mechanism of abnormal grain growth by Zr addition in pressless processed Nd-Fe-B sintered magnets, Journal of Alloys and Compounds, https://doi.org/10.1016/j.jallcom.2021.161244, 887, 161244, 2021.12, Microstructures of pressless processed (PLP) Nd-Fe-B sintered magnets with and without Zr addition were investigated by scanning electron microscopy and scanning/transmission electron microscopy. In the Zr-free magnet, huge polygonal abnormal grains (AGs) about 100 times larger than the normal grain size were generated by PLP sintering at 975 °C. Electron backscattered diffraction analysis revealed that the PLP sintered magnet had a biaxial oriented texture of fine Nd2Fe14B grains with the orientation of the AGs significantly deviated from the biaxial oriented grains. By adding a small amount of Zr, fine plate-like Zr-B precipitates with a long period stacking ordered structure derived from the ZrB2 phase formed on the growth surfaces of Nd2Fe14B grains with a crystallographic orientation relationship. There were two Nd-rich grain boundary (GB) phases, namely, orthorhombic Nd3(Co, Cu) and metastable CaF2-NdO2, which became liquid during sintering. The boron consumption associated with the formation of Zr-B precipitates increased the Nd-rich GB phases, resulting in a homogeneous distribution of the liquid phase around the Nd2Fe14B grains. Therefore, the addition of Zr effectively suppressed the abnormal grain growth during PLP sintering owing to the pinning effect of the Zr-B precipitates and the formation of a homogeneous liquid phase distribution..
12.	H. Akamine, M. Mitsuhara, M. Nishida, V. Samaee, D. Schryvers, G. Tsukamoto, T. Kunieda, H. Fujii, Precipitation behaviors in Ti-2.3 wt.%Cu alloy during isothermal and two-step aging, Metallurgical Materials Transactions A, https://doi.org/10.1007/s11661-021-06265-x, 52, 7, 2760-2772, 2021.07.
13.	Y. Soejima, A. Heima, H. Akamine, T. Inamura, M. Nishida, Comparison of in situ SEM and TEM observations of thermoelastic martensitic transformation in TiNi shape memory alloy, Materials Transactions, 10.2320/matertrans.MT-M2020219, 61, 11, 2107-2114, 2020.09, ©2020 The Japan Institute of Metals and Materials. To quantitatively understand the thin foil effect in in situ observations of the B2 to B19A transformation in TiNi alloy, the microstructure of the B19A martensite in thin foil and bulk specimens was compared. The transformation temperatures decreased with decreasing specimen thickness. There were large habit plane variants more than several tens of micrometers in size in the area of the specimen less than 10μm thick. The critical thicknesses for reproducing the transformation behavior in the bulk material was about 20μm based on the self-accommodation morphology and 4 μm based on the twin width ratio of the (011) type II twin..
14.	Fumiyoshi Yamashita, Yasunori Ide, Hiroshi Akamine, Kouji Ishikawa, Minoru Nishida, Effect of C/O Ratio on Phase Change and Stability of Inclusions in Ti–Ni Alloys Fabricated by a Commercial Production Process, Shape Memory and Superelasticity, 10.1007/s40830-020-00302-1, 6, 3, 354-364, 2020.09, © 2020, ASM International. The effects of carbon/oxygen concentrations in Ti-51 at.% Ni on the morphology and phase changes of inclusions in a commercial wire manufacturing process were investigated. Whereas cast material fabricated with a carbon to oxygen mass concentration ratio (C/O ratio) of 1.0–1.5 were found to contain single-phase Ti(C,O), when hot working was performed, some of the Ti(C,O) exhibited a phase change to Ti2Ni(O), and a mixed phase structure was found in specimens with a C/O ratio of less than 1.5. On the other hand, single-phase Ti(C,O) was found to remain in the wire produced from the specimens with a C/O ratio of 1.5..
15.	Hiroshi Akamine, Yohei Soejima, Tadaaki Nakamura, Sahar Farjami, Takashi Fukuda, Tomoyuki Kakeshita, Minoru Nishida, Isothermal martensitic transformations in an aged Ni-rich Ti-Ni alloy containing coherent Ti3Ni4 particles, Materials Transactions, 2020.03, The time dependence nature of B2 (ordered cubic) to R (trigonal) and R to B19A (monoclinic) martensitic transformations in an aged Ni-rich Ti-Ni alloy was investigated by electrical resistivity measurements. Both B2 to R and R to B19A transformations exhibit time dependence nature in the aged alloy containing coherent lenticular Ti3Ni4 precipitates with an average diameter of about 110 nm. However, the successive B2-R-B19A isothermal transformation is not detected by electrical resistivity measurements. The isothermal R-B19A transformation is visualized by in situ scanning electron microscopy (SEM) observations..
16.	Hiroshi Akamine, So Okumura, Sahar Farjami, Yasukazu Murakami, Minoru Nishida, Imaging of surface spin textures on bulk crystals by scanning electron microscopy, Scientific Reports, 10.1038/srep37265, 6, 2016.11, © The Author(s) 2016. Direct observation of magnetic microstructures is vital for advancing spintronics and other technologies. Here we report a method for imaging surface domain structures on bulk samples by scanning electron microscopy (SEM). Complex magnetic domains, referred to as the maze state in CoPt/FePt alloys, were observed at a spatial resolution of less than 100 nm by using an in-lens annular detector. The method allows for imaging almost all the domain walls in the mazy structure, whereas the visualisation of the domain walls with the classical SEM method was limited. Our method provides a simple way to analyse surface domain structures in the bulk state that can be used in combination with SEM functions such as orientation or composition analysis. Thus, the method extends applications of SEM-based magnetic imaging, and is promising for resolving various problems at the forefront of fields including physics, magnetics, materials science, engineering, and chemistry..
17.	H. Akamine, K.H.W. van den Bos, N. Gauquelin, S. Farjami, S. Van Aert, D. Schryvers, M. Nishida, Determination of the atomic width of an APB in ordered CoPt using quantified HAADF-STEM, Journal of Alloys and Compounds, 10.1016/j.jallcom.2015.04.205, 644, 570-574, 2015.09.
18.	Hiroshi Akamine, Sahar Farjami, Hidetsugu Sakaguchi, Minoru Nishida, Phase-field simulation of magnetic field-induced preferential variant selection in A1-L1₀ disorder-order transformation, International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015 PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, 425-426, 2015.06, Near-equiatomic Co-Pt, Fe-Pd and Fe-Pt alloys undergo cubic-tetragonal disorder-order transformation and form three orientation variants. It has been reported that magnetic fieldinduced preferential nucleation of one variant in the initial stage of ordering introduces preferential growth of the same variant in the later magnetic field-free stage [1]. In this study, the effect of preferential nucleation on microstructure evolution in the later stage is studied by phasefield method. The results indicate that the increase in fraction of preferential variant depends on nucleation ratio between the variants, and the stress field originated from the macroscopic shape deformation is the most possible factor affecting preferential growth in the later stage..
19.	Hidetsugu Sakaguchi, Hiroshi Akamine, Domain wall dynamics in ginzburg-landau-type equations with conservative quantities, Journal of the Physical Society of Japan, 10.7566/JPSJ.83.064006, 83, 6, 2014.06, © 2014 The Physical Society of Japan. In the Ginzburg-Landau equation, there are domain walls connecting two metastable states. The dynamics of domain walls has been intensively studied, but there remain still unsolved but crucial problems even for a single domain. We study the domain wall dynamics in three different Ginzburg-Landau-type equations satisfying conservation laws. In a modified ø4 model satisfying the law of energy conservation and the Lorentz invariance, the motion of a domain wall is accelerated and the velocity approaches its maximum. In a one-dimensional model of eutectic growth, the order parameter is conserved and a domain wall connecting a metastable uniform state and a spatially periodic pattern appears. We try to find a selection rule for the wavelength of a spatially periodic pattern. In a model equation for martensitic transformation, a domain wall connecting a uniform metastable state and a zigzag structure appears which propagates at a high velocity..
20.	Hiroshi Akamine, Sahar Farjami, Masatoshi Mitsuhara, Minoru Nishida, Takashi Fukuda, Tomoyuki Kakeshita, Electron microscopy study of preferential variant selection in CoPt alloy ordered under a magnetic field, Materials Transactions, 10.2320/matertrans.MAW201313, 54, 9, 1715-1718, 2013.08, [URL], Transmission electron microscope (TEM) and scanning transmission electron microscope (STEM) observations were carried out to investigate microstructure formation and variant selection process in L1₀-type ordered CoPt alloy upon a two-step ordering heat-treatment. The first step corresponds to nucleation process carried out under a magnetic field of 10 T and the second step represents growth process without magnetic field. After the first step of ordering, ordered domains of about 5 nm in size were observed and fraction of the preferred variant with the c-axis parallel to applied magnetic field was slightly higher than that of the other two variants. Formation of tweed microstructure along {011}L1₀ was confirmed at the initial stage of ordering. This structure is considered to be derived from the periodic alignment of interface between two ordered variants with twin relation. At the early stage of the second step of ordering, numerous micro-twins were formed through tweed microstructure and the volume fraction of the preferred variant was increased accompanying with modulation of twins, while that of other two variants was decreased. After the second step of ordering, the twins were vanished and single variant was obtained..
21.	K. Morimoto, N. Katayama, H. Akamine, M. Itakura, Coercivity enhancement of anisotropic Dy-free Nd-Fe-B powders by conventional HDDR process, Journal of Magnetism and Magnetic Materials, 10.1016/j.jmmm.2012.06.003, 324, 22, 3723-3726, 2012.11, Coercivity enhancement of Dy-free Nd-Fe-Co-B-Ga-Zr powders was studied using the conventional hydrogenation-decomposition-desorption-recombination (HDDR) process. It was found that the addition of Al together with the proper Nd content and the slow hydrogen desorption of the HDDR treatment can induce high coercivity in the powder. For example, the 14.0 at% Nd-2.0 at% Al powder exhibits H cJ of 1560 kA/m, B r of 1.22 T, and (BH) max of 257 kJ/m 3. The high coercivity inducement of the powder is thought to be attributed to the formation of Nd-rich phase, which continuously surrounds fine Nd 2Fe 14B grains. © 2012 Elsevier B.V..

主要総説, 論評, 解説, 書評, 報告書等

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1.

赤嶺大志, 走査電子顕微鏡による表面の強磁性・強誘電性ドメインの観察, セラミックス誌, 2019.02, 走査電子顕微鏡を用いた強磁性・強誘電性ドメイン観察手法に関する解説論文．近年，走査電子顕微鏡に搭載されるようになった環状型の検出器を用いて磁区構造や強誘電ドメインなどの従来観察が難しかったドメイン構造を可視化する方法について，著者自身の研究をベースとした解説論文．論文中では，電磁気的なコントラストが得られる物理的要因についても考察を述べた．.

2.

赤嶺大志, 走査電子顕微鏡による強磁性体材料の表面磁区構造観察, まてりあ, 2018.03, 走査電子顕微鏡による磁性体磁区構造可視化の研究に関する解説論文．走査電子顕微鏡による磁区構造観察はその困難さゆえ，広く利用されるには至っていなかった．そこで，近年導入が進むインカラム型の電子検出器を応用して，従来手法と相補的な役割を担う観察手法を提案した．.

主要学会発表等

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1.	田代隼斗, 赤嶺大志, 飯久保智, 橋本翔太朗, 國枝知徳, β-Ti 合金の ω 相変態に及ぼす添加元素の置換サイトの影響, 第174回日本金属学会 2024年春期講演大会, 2024.03.
2.	二宮翔, 梁哲源, 赤嶺大志, 新居涼太郎, 喜瀬純男, 西田稔, 西堀麻衣子, X線吸収分光とスペクトルシミュレーションによるCu-Al-Mn形状記憶合金の局所構造解析, 第174回日本金属学会 2024年春期講演大会, 2024.03.
3.	赤嶺大志, Alimzhan Kalbekov, 松田光弘, 波多聰, 西田稔, Ti-Ni形状記憶合金における水素誘起相変態の電子顕微鏡解析, 第174回日本金属学会 2024年春期講演大会, 2024.03, 当該分野における国内の主要学会である日本金属学会において，形状記憶合金に関する研究成果（Akamine, et al., Acta Mater. 2023他）が評価され，基調講演の機会を得た．基調講演では水素により誘起される新しい相変態に関する講演を行い，評価を受けた．.
4.	彦坂元，副島洋平，赤嶺大志，篠原百合, 西田稔，稲邑朋也, Ti-Niにおける自己調整組織のNi濃度依存性とその支配因子, 第174回日本金属学会 2024年春期講演大会, 2024.03.
5.	彦坂元，副島洋平，赤嶺大志，西田稔，稲邑朋也, Ti-Ni合金の自己調整組織における不適合性のNi濃度依存性, 第173回日本金属学会 2023年秋期講演大会, 2023.09.
6.	赤嶺大志，平間慧，副島洋平，光原昌寿，稲邑朋也，西田稔, Ti-Ni合金の変態誘起転位はいつどこで発生するか?, 第173回日本金属学会 2023年秋期講演大会, 2023.09.
7.	朱尚萍, 赤嶺大志, 猪石篤, 飯久保智, フッ化物イオン電池におけるCuF2複合正極材料の組織観察, 第173回日本金属学会 2023年秋期講演大会, 2023.09.
8.	田代隼斗, 赤嶺大志, 飯久保智, β-Ti合金における非等温ω変態に及ぼす添加元素の影響に関する第一原理計算, 第173回日本金属学会 2023年秋期講演大会, 2023.09.
9.	吉村洋諒，赤嶺大志，板倉賢, 小池邦博, 配向制御を目指した 3D-seeds 配向成長法の Nd-Fe-B 多層膜磁石への応用, 第173回日本金属学会 2023年秋期講演大会, 2023.09.
10.	Alimzhan Kalbekov, Hiroshi Akamine, Satoshi Hata, Saya Ajito, Eiji Akiyama, Minoru Nishida, Influence of Hydrogen on Martensitic Phase Transformation in Near-equiatomic Ti-Ni Alloy: Insights from SEM Observations and In-situ Cooling SEM Analysis, IMC20 Satellite Symposium, 2023.09.
11.	魚本輝介，赤嶺大志，板倉賢，入山恭彦, Nd-Fe-B 系粒界拡散焼結磁石の微細構造に及ぼす Cu の影響, 日本金属学会・日本鉄鋼協会・軽金属学会九州支部共催合同学術講演会, 2023.06.
12.	吉村洋諒，赤嶺大志，板倉賢, 小池邦博, 3D-seeds 配向成長 Nd-Fe-B 薄膜磁石の微細構造解析, 日本金属学会・日本鉄鋼協会・軽金属学会九州支部共催合同学術講演会, 2023.06.
13.	Alimzhan Kalbekov, 赤嶺大志, 波多聰, 味戸沙耶, 秋山英二, 西田稔, 水素チャージしたTi-Ni合金の変態挙動と微細組織変化, 日本金属学会第172回春期講演大会, 2023.03.
14.	梁哲源、二宮翔、赤嶺大志、新居涼太郎、喜瀬純男、西田稔、西堀麻衣子, X線吸収分光とスペクトルシミュレーションによるCu-Al-Mn形状記憶合金の局所構造秩序度に対する時効効果, 日本金属学会第172回春期講演大会, 2023.03.
15.	永利弘毅、赤嶺大志、西田稔、塚本元気、國枝知徳, β-Ti合金におけるω相変態挙動に及ぼす添加元素の影響, 日本金属学会2022年秋期(第171回)講演大会, 2022.09.
16.	新居涼太郎、高松凌、赤嶺大志、板倉賢、西田稔、喜瀬純夫, 単結晶Cu-Al-Mn超弾性合金における変形挙動の温度及び結晶方位依存性, 日本金属学会2022年秋期(第171回)講演大会, 2022.09.
17.	吉村洋諒，赤嶺大志，板倉賢，常澤佑太, 宇田龍生，小池邦博, SmFe12薄膜磁石の微細構造に及ぼす基板加熱温度の影響, 日本金属学会九州支部・日本鉄鋼協会九州支部・軽金属学会九州支部・合同学術講演会, 2022.06.
18.	小佐々周也、田嶋哲人、赤嶺大志、板倉賢、西田稔、村上恭和、堀部陽一, SEMによる間接強誘電体(Ca,Sr)3Ti2O7の強誘電ドメイン観察, 日本顕微鏡学会第76回学術講演会, 2020.05.
19.	赤嶺大志，板倉賢，西田稔, 金属および酸化物のSEM観察試料作製〜実例をもとに〜, 第35回分析電子顕微鏡討論会, 2019.09, 近年の走査電子顕微鏡（SEM）の進展に伴い，従来の表面起伏や組成コントラストに加えて非常に表面敏感なイメージング手法が発達してきた．これらのイメージング手法を用いることによって，ミクロな格子欠陥から表面電位差に至るまで物質の構造や化学状態を反映したコントラストを得ることが可能となり，SEM分析のアプリケーションは大きく拡大した．しかし一方で，ある情報がよく見えるようになるということは，従来無視できていたアーティファクト，すなわち試料作製時に導入される微細なダメージが観察時の問題として顕在化してくるという事を意味している．したがって，進歩するSEM技術を十分に活用するためには同時に試料作製法についても検討する必要がある．SEM試料作製方法については既に様々な手法が提案されているが，一般に材料によって最適な処理は異なる．したがって，本稿では我々研究グループが検討してきた事例について紹介するケーススタディの形で最適な表面処理方法の検討について述べる．.
20.	＠赤嶺大志，＠板倉賢，＠西田稔, 複数検出器を併用した合金組織の多元的SEM解析, 日本電子顕微鏡学会 SEM分科会, 2019.05, 近年目覚ましい発展を遂げた走査電子顕微鏡の観察手法，特に多様な検出器を利用したイメージング手法について解説する．.
21.	赤嶺大志, 東園拓海, 副島洋平, 西田稔, SEM像の特徴点抽出による熱弾性マルテンサイト変態の組織再現性評価, 日本金属学会第163回秋期講演大会, 2018.09.
22.	Hiroshi Akamine, Akane Inomata, Minoru Nishida, Interpretation of moire fringes in SEM observations for periodic microstructures, 19th International Microscopy Congress (IMC19), 2018.09.
23.	赤嶺大志, 吉岡秀樹, Cho Youngji, 堀部陽一, 村上恭和, 西田稔, SEMによるマルチフェロイックHoMnO3の強誘電ドメイン観察, 第74回日本顕微鏡学会学術講演会, 2018.05.
24.	赤嶺大志, 猪俣茜, 西田稔, 周期的組織のSEM観察において現れるモアレ縞の特徴, 第74回日本顕微鏡学会学術講演会, 2018.05.
25.	赤嶺大志, 猪俣茜，奥村聰, 板倉賢，村上恭和，西田稔, マルテンサイト組織のSEM観察において現れる縞状コントラストの性質, 日本金属学会第161回秋期講演大会, 2017.09.
26.	赤嶺大志, 奥村聰, Sahar Farjami, 村上恭和, 西田稔, 走査電子顕微鏡と環状検出器を用いた表面磁区構造観察法の検討, 日本金属学会第160回春期講演大会, 2017.03.

その他の優れた研究業績

2018.06, 主要論文（Scientific Reports, 2016）に関する記事が2月9日日刊工業新聞に掲載。.

所属学会名

日本顕微鏡学会

学会大会・会議・シンポジウム等における役割

2023.09.19～2023.09.21, 第173回日本金属学会 2023年秋期講演大会, 座長.

Best Paper Honorable Mention, ASM International, 2024.03.

金属組織写真優秀賞, 日本金属学会, 2015.12.

若手講演論文賞, 日本金属学会, 2014.03.

科学研究費補助金の採択状況(文部科学省、日本学術振興会)

2020年度～2023年度, 基盤研究(B), 分担, 超顕微解析に基づく積層型ナノコンポジット膜磁石の配向界面制御.

2022年度～2024年度, 挑戦的研究（萌芽）, 分担, NaCl型炭化物によって強化したTi系高温形状記憶合金の創製.

2024年度～2026年度, 基盤研究(C), 分担, 除振要素用板状Cu-Al-Mn-Ni形状記憶合金素子の疲労特性向上技術の構築.

2023年度～2026年度, 海外連携研究, 分担, 機能性材料におけるナノ欠陥と欠陥誘起ひずみ場の定量的評価に基づく特性制御.

2023年度～2024年度, 若手研究, 代表, Ti-Ni超弾性合金における水素誘起相変態の機構解明.

2023年度～2025年度, 基盤研究(A), 分担, 多数回の強い揺れを伴う巨大地震後の建物の機能維持に向けた高耐疲労超弾性合金の開発.

2023年度～2025年度, 基盤研究(A), 分担, ナノ析出による変態ヒステリシス制御の科学と形状記憶特性の革新.

2020年度～2023年度, 基盤研究(B), 分担, マルテンサイト変態の原子変位機構に着目した高温形状記憶合金の機能予測と創製.

2019年度～2021年度, 基盤研究(A), 分担, 階層的顕微解析による熱弾性マルテンサイト変態の多様性の理解.

2019年度～2020年度, 挑戦的研究（萌芽）, 分担, 低加速二次電子像におけるコントラスト増幅観察法の開発.

2018年度～2020年度, 国際共同研究強化(B), 代表, 材料界面の複合顕微解析―結晶構造と電磁気特性の多元定量解析技術の開発と応用―.

2018年度～2021年度, 基盤研究(A), 分担, 担持触媒系材料が示す電位分布の精密解析～手法開発と活性部位の特定.

2018年度～2019年度, 若手研究, 代表, 走査電子顕微鏡によるマルチフェロイック材料の強誘電ドメイン観察法の確立.

寄附金の受入状況

2023年度, 古河テクノマテリアル, TiNi形状記憶合金に関する共同研究.

2022年度, 公益財団法人池谷科学技術振興財団, 単年度研究助成.

2018年度, 公益社団法人スズキ財団, 研究者海外研修助成金.


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