English
茨城大学
フロンティア応用原子科学研究センター

顔写真
助教

小貫　祐介

オヌキ　ユウスケ
Onuki Yusuke

経歴

  1. サスカチュワン大学 Department of Engineering ポスドク研究員 2013/04/20-2014/03/31
  2. 東北大学 多元物質科学研究所 教育研究支援者 2014/05/01-2014/12/31

学歴

  1. 横浜国立大学 工学府 システム統合工学専攻 博士後期 2013/03/31 修了 日本

学位

  1. 博士（工学） 横浜国立大学 2013/03/31

研究分野

  1. 構造・機能材料
  2. 材料加工・組織制御工学

研究キーワード

  1. 集合組織
  2. 中性子回折
  3. 微細組織制御

研究テーマ

  1. 多結晶磁歪合金の高性能化をもたらす組織設計と配向制御指針の確立 2015/04/01-現在
  2. 無機・金属材料の微細組織構造階層性を指向した中性子散乱解析システムの開発 2016/04/01-現在
  3. 金属材料の集合組織・微細組織の高速高精度測定技術の確立とin situ中性子散乱解析システムの開発 2016/04/01-現在
  4. 中性子線による高温オーステナイト組織の動的微細組織変化のその場観察 2016/04/01-現在

論文

  1. 研究論文（学術雑誌） 共著 Quantitative phase fraction analysis of steel combined with texture analysis using time-of-flight neutron diffraction Yusuke Onuki, Akinori Hoshikawa, Shigeo Sato, Toru Ishigaki & Toshiro Tomida Journal of Materials Science 52/ 19, 11643-11658 2017/06/27 0022-2461 DOI 10.1007/s10853-017-1309-x The accuracy of the phase fraction determined by time-of-flight neutron diffraction measurement at iMATERIA was verified by preparing model samples consisting of laminations of ferritic and austenitic stainless-steel sheets. Rietveld texture analysis, based on 132 diffractograms, was employed as the analysis method. The analyzed volume fractions of austenite agree with the prepared fractions (0.61–49.3 vol%) with a maximum error of only 5%, relative to the prepared fractions. This is due to the excellent fitting quality of the multidiffractogram- based Rietveld refinement with consideration given to the textures of both the major and minor phases. Although the quality of the texture analysis for the austenite phase becomes poor, at\5 vol%, the consideration of the textures improves the accuracy of the phase fraction determination. Also described is how the textures affect the phase fractions, as determined by the conventional diffraction method. It is clearly shown that texture cannot be ignored in phase fraction analysis and, in turn, a reasonable consideration of the texture realizes precision in the analysis.
  2. 中性子を利用した結晶方位の先端的評価技術の開発と今後の展望 小貫 祐介 まてりあ 公益社団法人 日本金属学会 55/ 3, 104-107 2016 1340-2625 URL
  3. 研究論文（国際会議プロシーディングス） 共著 Rapid Measurement of Texture of Metals by Time-of-Flight Neutron Diffraction at iMATERIA and its Applications Y. ONuki, A. Hoshikawa, S. Sato, T. Ishigaki Materials Science Forum Trans Tech Publications 879, 1426-1430 2017 1662-9760 10.4028/www.scientific.net/MSF.879.1426 The authors have developed the texture measurement system at iMATERIA, which is the neutron diffractometers built in Materials and Life Science Experimental Facility (MLF) at J-PARC, Japan. The high flux of the incident beam and Time-Of-Flight method enabled the complete texture measurement within several minutes in case of steels. Since the neutron beam can transmit most of the materials, the measured texture represents the state of whole exposed volume. The multi-histogram analysis also enables to determine phase fractions in a multiphase material as well as the texture of each phase.
  4. 研究論文（学術雑誌） 共著 Rapid measurement scheme for texture in cubic metallic materials using time-of-flight neutron diffraction at iMATERIA Yusuke Onuki,* Akinori Hoshikawa, Shigeo Sato, Pingguang Xu,Toru Ishigaki, Yoichi Saito, Hidekazu Todoroki and Makoto Hayashi Journal of Applied Crystallography 49, 1579-1584 2016/10 10.1107/S160057671601164X URL A rapid texture measurement system has been developed on the time-of-flight neutron diffractometer iMATERIA (beamline BL20, MLF/J-PARC, Japan). Quantitative Rietveld texture analysis with a neutron beam exposure of several minutes without sample rotation was investigated using a duplex stainless steel, and the minimum number of diffraction spectra required for the analysis was determined experimentally. The rapid measurement scheme employs 132 spectra, and by this scheme the quantitative determination of volume fractions of texture components in ferrite and austenite cubic phases in a duplex stainless steel can be made in a short time. This quantitative and rapid measurement scheme is based on the salient features of iMATERIA as a powder diffractometer, i.e. a fairly high resolution in d spacing and numerous detectors covering a wide range of scattering angle.
  5. 研究論文（国際会議プロシーディングス） 共著 Stress and Strain Analysis in an Fe-Ga Alloy Single Crystal T. Ikeuchi, S. Tsubaki, M. Imafuku, S. Fujieda, Y. Onuki, S. Suzuki Materials Science Forum Trans Tech Publications 879, 807-809 2017 1662-9760 10.4028/www.scientific.net/MSF.879.807