九州大学-研究者情報 [金子賢治 (教授) 工学研究院材料工学部門]

金子賢治（かねこけんじ）

データ更新日：2024.02.22

教授　／　工学研究院材料工学部門材料加工工学

著書

1.	Katsuaki Nakamura, Koji Neishi, Kenji Kaneko, Michihiko Nakagaki, Zenji Horita, Continuous grain refinement using severe torsion straining process, 503-504, 385-390, 2006, This study presents a new rapid continuous process for grain refinement in metallic materials through severe plastic deformation (SPD). The new process, designated in this study the severe torsion straining process (STSP), is applicable to a wide range of alloys based on aluminum, magnesium and copper including carbon steel. This process consists of producing a local heated zone in a rod and cooling both sides of the heated zone by spray water while rotating one end with the other. Thus, torsion strain is introduced in the local heated zone. The STSP can be continuous because the straining is achieved while the rod is shifted along the longitudinal axis of die rod. Furthermore, the process requires no die, suggesting a potential for commercialization of grain refinement through SPD. In this study, STSP was applied to an Al-Mg alloy and a Mg-Al-Zn alloy. It is shown that STSP is effective for both alloys so that the grain size is reduced to ∼1.5 μm for the Al alloy and ∼0.9 μm for the Mg alloy. Tensile testing showed that the strength is increased with a minimal decrease in uniform elongation. There is a critical ratio between rotation speed and moving speed, which defines the feasibility of STSP operation without breaking the rod. The grain size tends to be lowered as the ratio is close to the critical value..
2.	Yoshiyasu Kawasaki, Koji Neishi, Yuichi Miyahara, Katsuaki Nakamura, Kenji Kaneko, Michihiko Nakagaki, Zenji Horita, Application of severe torsion straining process for grain refinement of steel, 503-504, 943-948, 2006, Severe torsion straining process (STSP) is a useful technique for grain refinement of metallic materials. With this process, a local heated zone is produced in a rod and one side of the rod is rotated with respect to the other so that torsion strain is introduced into the local heated zone. Severe straining is then achieved continuously throughout the rod by simultaneous rotation and longitudinal movement of the rod. Thus, the STSP is a continuous process and a die-less process for grain refinement. It is suggested that the STSP provide potential for commercialization. In this study, S45C steel rods with 12 mm in diameter were subjected to STSP. This process was conducted at a temperature of 923 K (650°C) with various ratios of rotation to longitudinal movement of a rod. Local heating was made using an induction coil and both sides of the local heated zone were cooled by water spray. Microscopy observation revealed that the initial grain size of ∼15 μm was reduced to ∼2 μm using the STSP..
3.	Yoichi Takeda, Naohiko Shimada, Kenji Kaneko, Kazuo Sakurai, Seiji Shinkai, Property of polysaccharide nano gel involves polyion complex consists of cationic polymer/ DNA, 2006.10, It is known to be hydrophobic as for the Polyion complex that consisits of DNA and the cation when it is equal compared with the cation/anion. On the other hand, when the DMSO solution of β glucan is dropped to water, the Nano gel that has the hydrophobic area internally is formed. We found that DNA and the cation complex be able to be involved in the Nano gel of Schizophyllan that one of β glucan for the first time in this research. Moreover, the application of CpG DNA delivery will be described..
4.	Ayumu Umemoto, Koichi Hayashi, Kyoko Hayano, Noritaka Saito, Kenji Kaneko, Kunihiko Nakashima, Effect of mo powder surface condition on fabrication of Mo-SiO₂ functionally graded materials with slipcasting method, 198, 219-224, 2007, The conventional high intensity discharge lamps are made of Mo foil-sealing method, in which the Mo-metal of 30 μm thick is sandwiched by the fused silica envelope. The conventional high intensity discharge lamps therefore requires cooling system to reduce the thermal stress between Mo and fused silica during the switching operation and a long sealing zone is usually required to complete hermeticity, especially in high power devices, so that the production of compact high intensity discharge lamps has been a Herculean task. We show the invention of the new type of hermetically-sealed high intensity discharge lamps, made of Mo-SiO₂ functionally graded material (FGM) as an electrode and a sealing component. In the case of high intensity discharge lamps with Mo-SiO₂ FGM (FGM-Lamp), the thermal expansion coefficient between Mo and SiO₂ is functionally graded so that it tolerates a large numbers of heating cycles, with no cooling system are required. Furthermore lamps survive without breakage. The W electrode is totally separated from the lamp envelope by the FGM, so that no leakage of the luminous elements or gases takes place, when a large gas pressure exists inside a lamp. In this paper, effects of Mo powder surface conditions on the fabrication of Mo-SiO ₂ FGM have been investigated. Mo-SiO₂ FGM with as-received Mo powder revealed that the Mo particles were homogenously distributed, which resulted in no microscopic compositional gradient. In contrast. Mo-SiO ₂ FGM with pre-treated Mo powder provided a uniform gradient from the conductive part (Mo-rich phase) to the sealing part (amorphous silica)..
5.	Kenji Kaneko, Keisuke Sato, Zenji Horita, Koji Inoke, Characterization of precipitates by three-dimensional electron tomography, 561-565, 2009-2012, 2007, Structures and morphologies of Ge precipitates in an Al-Ge alloy were characterized by a combination of transmission electron microscopy and three-dimensional electron tomography. Faceting of the precipitates was clearly seen using transmission electron microscopy and varieties of precipitate morphologies were identified by three-dimensional electron tomography..
6.	S. Sadamatsu, Masaki Tanaka, K. Higashida, Kenji Kaneko, Masatoshi Mitsuhara, Satoshi Hata, M. Honda, Crack tip dislocations observed by combining scanning transmission electron microscopy and computed tomography, 10.4028/www.scientific.net/AMR.89-91.473, 89-91, 473-478, 2010, [URL], Crack tip dislocations and dislocations introduced by three point-bending tests at high temperature are observed by combinating scanning transmission electron microscopy and computed tomography (STEM-CT). Commercially available P type (001) single crystal silicon wafers were employed. A series of STEM image was acquired from -60° to +60° in tilt range with 2° in tilt step. The diffraction vector was maintained close to g(hkl) = 220 during the acquisition by adjusting the [110] direction of the sample parallel to the tilt axis of the holder. Reconstructed images of dislocations revealed dislocation structures in three-dimension..
7.	J. S. Barnard, J. H. Sharp, Satoshi Hata, Masatoshi Mitsuhara, Kenji Kaneko, K. Higashida, 3-dimensional imaging of dislocation microstructures by electron beams, 10.1557/opl.2012.430, 2012.12, [URL], We review the progress in the electron tomography of dislocation microstructures in the transmission electron microscope (TEM). Dislocation contrast is visible both in conventional TEM and scanning TEM (STEM) modes and, despite the complicated intensity variations, dislocation contrast can be isolated using computational filtering techniques prior to reconstruction. We find that STEM annular dark-field (STEM-ADF) imaging offers significant advantages in terms of dislocation contrast and background artifacts. We present several examples, both in semiconducting and metallic systems, illustrating the properties of 3D dislocations. We present the high-angle triple-axis (HATA) specimen holder where the diffraction condition can be chosen at will and dislocation tomograms of multiple reflections can be combined. 3D dislocations are analyzed in terms of dislocation density and dislocation nodal structures. Several avenues of study are suggested that may exploit the 3D dislocation data..
8.	T. Nishiyama, K. Yamada, Ryo Teranishi, Kenji Kaneko, T. Kato, T. Izumi, Y. Shiohara, Three-dimensional characterization of BaZrO₃ precipitates in Y_1-xGd_xBa₂Cu₃O_7-y prepared by TFA-MOD using STEM-tomography, 10.4028/www.scientific.net/MSF.750.48, 750, 48-51, 2013, [URL], Y_1-xGd_xBa₂Cu₃O_7-y film with BaZrO₃ was fabricated on CeO₂ buffered LaMnO₃/ion beam assisted deposition MgO/Gd₂Zr₂O₇/Hastelloy C276TM substrates by the trifluoroacetates metal organic deposition process, whose microstructural and elemental analyses were performed by transmission electron microscopy. Y_1-xGd_xBa₂Cu₃O_7-y film with the thickness about 700 nm was found composed of c-axis oriented grains and large numbers of randomly oriented precipitates, such as (Y,Gd)₂Cu₂O₅, CuO and BaZrO₃. (Y,Gd)₂Cu₂O₅ and CuO precipitates were heterogeneously dispersed in the Y_1-xGd_xBa₂Cu₃O_7-y matrix with their sizes ranging between 100 and 200 nm, and BaZrO₃ precipitates were uniformly dispersed with their sizes ranging between 10 and 20 nm. Electron tomography with elemental information was performed further to reveal the threedimensional information of BaZrO₃ precipitates..
9.	Hadi Razavi Khosroshahi, Xin Liu, Noritaka Saito, Kunihiko Nakashima, Kenji Kaneko, Effect of nano-sized particles on the mechanical properties of Y2O3, 10.4028/www.scientific.net/MSF.750.44, 750, 44-47, 2013, [URL], Two types of TiO₂/Y₂O₃ and ZrO₂/Y₂O₃ composites were fabricated for enhancing the mechanical properties of Y₂O₃ ceramic. Results showed that ZrO₂/Y₂O₃ composite dramatically increased the strength and toughness as 417 MPa and 4.4 MPa.m^1/2, respectively..
10.	Kenji Kaneko, Yoshio Sakka, Yoshizumi Ishikawa, TEM characterization of nanocomposite materials, Springer Berlin Heidelberg, 10.1007/978-3-642-38934-4_8, 2014.01, [URL], In this chapter, we describe the introduction and application of 2-dimensional (2D) and 3-dimensional (3D) characterization by transmission electron microscopy (TEM) of two types of nanocomposite materials, ceramic matrix nanocomposites (CMNC), and polymer matrix nanocomposites (PMNCs), in particular. For the case of CMNC, structural and morphological characterizations of matrix and nanostructure phases were carried out, and for the case of PMNC, dispersion and distribution of nanoparticles as well as interparticle distances between them were investigated..
11.	edited by M. Hosokawa, K. Nogi, M. Naito, T. Yokoyama, Nanoparticle Technology Handbook, Elsevier, 2007.12.
12.	金子賢治, 基板表面構造と薄膜ナノ構造制御, 日刊工業新聞社, 2003.01.
13.	金子賢治, 透過型電子顕微鏡, CMC, 2004.01.
14.	金子賢治, エネルギーフィルター, フジテクノシステム, 2006.01.
15.	金子賢治, 透過型電子顕微鏡によるナノ分子超構造の解析, 日刊工業新聞社, 2006.03.
16.	金子賢治, 粒界と界面, 日刊工業新聞社, 2006.04.

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