Ibaraki University's
Frontier Research Center for Applied Atomic Sciences

顔写真
Assistant Professor

Onuki Yusuke


Career

  1. University of Saskatchewan Department of Engineering Postdoctoral Research Fellow 2013/04/20-2014/03/31
  2. Tohoku University Institute of Multidisciplinary Research for Advanced MAterials Research Associeate 2014/05/01-2014/12/31

Academic background

  1. Yokohama National University Graduate School of Engineering システム統合工学専攻 Doctor later 2013/03/31 Completed Japan

Academic degrees

  1. Doctor of Enginnering Yokohama National University 2013/03/31

Research Areas

  1. Structural/Functional materials
  2. Material processing/Microstructural control engineering

Research keywords

  1. Texture
  2. neutron diffraction
  3. microstructure control

Subject of research

  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-Present
  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-Present
  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-Present
  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-Present

Research Projects (Competitive Research Funds)

  1. 微細組織制御のための中性子回折―中性子透過能に優れた治具開発によるパラダイムシフト― Others 2018年度 天田財団 助成金 2018/09/25-2021/03/31
  2. 形状・組織の同時制御による高効率・高付加価値のマグネシウム合金部材製造技術の確立 Science research expense 若手研究 2018/04/01-2021/03/31
  3. 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 Others 石原・浅田研究助成 2016/04/01-2018/03/31
  4. 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 Science research expense 若手研究(B) 2015/04/01-2018/03/31

Papers

  1. Research paper (international conference proceedings) Joint Development and verification of simultaneous measurement system for texture and phase fraction by time-of-flight neutron diffraction at iMATERIA Y Onuki, A Hoshikawa, S Sato, S Nishino, T Ishigaki, T Tomida IOP Conference Series: Materials Science and Engineering IOP Publishing 375, 012035 2018/06 10.1088/1757-899X/375/1/012035 URL The authors have developed the simultaneous measurement scheme for texture and phase fraction by using the Time-Of-Flight (TOF) neutron diffractometer, iMATERIA at JPARC MLF, Japan. The Rietveld texture analysis (RTA) was applied for the data analysis method, which has been developed mainly at HIPPO diffractometer at LANSCE, USA. Because of the differences of measurement scheme and machine specifications, the analysis for the data from iMATERIA requires some special treatments. In this paper, we provide instructional information for the measurement at iMATERIA and subsequent RTA to determine the textures and phase fraction in metallic materials. The instrumental features and measurement procedures are firstly introduced. Second, some unique data treatments, especially about the technique called “scale factor bounding” is explained, including how to set it. We also suggest some refinement strategies especially aiming to have accurate phase fraction determination.
  2. Research paper (scientific journal) Joint Strain-Induced Martensitic Transformation and Texture Evolution in Cold-Rolled Co–Cr Alloys Yusuke Onuki, Shigeo Sato, Maiko Nakagawa, Kenta Yamanaka, Manami Mori, Akinori Hoshikawa, Toru Ishigaki, Akihiko Chiba Quantum Beam Science Multidisciplinary Digital Publishing Institute 2/ 2, 11 2018/05/22 10.3390/qubs2020011 Co–Cr alloys have been used in biomedical purposes such as stents and artificial hip joints. However, the difficulty of plastic deformation limits the application of the alloys. During the deformation, Co–Cr alloys often exhibit strain-induced martensitic transformation (SIMT), which is a possible reason for the low formability. The distinct increase in dislocation density in the matrix phase may also result in early fractures. Since these microstructural evolutions accompany the textural evolution, it is crucial to understand the relationship among the SIMT, the increase in dislocations, and the texture evolution. To characterize those at the same time, we conducted time-of-flight neutron diffraction experiments at iMATERIA beamline at the Japan Proton Accelerator Research Complex (J-PARC) Materials and Life Science Experimental Facility (MLF), Ibaraki, Japan...
  3. Research paper (scientific journal) Joint Rietveld Texture Analysis for Metals Having Hexagonal Close-Packed Phase by Using Time-of-Flight Neutron Diffraction at iMATERIA Yusuke Onuki, Akinori Hoshikawa, Soichiro Nishino, Shigeo Sato, Toru Ishigaki Advanced Engineering Materials WILEY-VCH Verlag GmbH & Co. KGaA 2018/04 1527-2648 10.1002/adem.201700227 Texture is an important property especially for metallic materials having hexagonal close-packed crystal structure. In order to understand the overall property or change in the microstructure of materials, neutron diffraction is a powerful tool of investigation. In this study, we attempt to measure the textures of Ti–6Al–4V (mass%) alloy by using a time-of-flight neutron diffractometer, iMATERIA. The results indicate that the texture measurement for the hexagonal phase is possible with the same method as for cubic metals. The texture of cubic beta phase, whose volume fraction is several percent, can simultaneously be determined together with the hexagonal alpha phase.
  4. Research paper (scientific journal) 中性子回折ラインプロファイル解析によるフェライト系およびオーステナイト系ステンレス鋼の引張変形中の転位増殖その場観察 佐藤 成男, 鈴木 茂, 黒田 あす美, 佐藤 こずえ, 熊谷 正芳, ステファヌス ハルヨ, 友田 陽, 齋藤 洋一, 轟 秀和, 小貫 祐介 鉄と鋼 一般社団法人 日本鉄鋼協会 104/ 4, 201-207 2018/04/01 0021-1575 URL
  5. Research paper (international conference proceedings) Joint Characterization of Microscopic Stresses in a Polycrystalline Fe-Ga Alloy with Large Elastic Anisotropy Yusuke Onuki, Ryuji Ukai, Shigeo Sato, Shun Fujieda, Kozo Shinoda, Kentaro Kajiwara, Masugu Sato, Shigeru Suzuki Materials Science Forum Trans Tech Publications 905, 3-8 2017 10.4028/www.scientific.net/MSF.905.3

Research presentations

  1. Media report,etc. 【プレスリリース】「中性子回折による金属材料の集合組織高速測定システムを開発 J-PARC 内の茨城県材料構造解析装置 iMATERIA で世界最速レベルの技術を確立」 プレスリリース 2016/10/27

Intellectual property rights

  1. Patent Metallic material as a solid solution having a body-centered cubic (bcc) structure, an orientation of crystal axis <001> of which is controlled, and method of manufacturing the same JP2010042132 2010/02/22 WO2011105609A1 2011/09/01

Prizes

  1. 優秀講演発表賞 2019/05/23
  2. 第16回奨励賞 2018/12/04

Joint / funded research

  1. 茨城県中性子ビームラインの測定手法及び解析手法に係る試験研究事業 2015/01-2016/03 Commissioned research by the investment
  2. 茨城県中性子ビームラインの特性を活かした中性子構造解析の先導的研究事業 2015/01-2016/03 Commissioned research by the investment