茨城大学フロンティア応用原子科学研究センター

経歴

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
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

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

博士（工学）横浜国立大学 2013/03/31

研究分野

構造・機能材料
材料加工・組織制御工学

研究キーワード

集合組織
中性子回折
微細組織制御

研究テーマ

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
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
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
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

競争的資金等の研究課題

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― 科研費以外 2018年度天田財団助成金 2018/09/25-2021/03/31
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科研費若手研究 2018/04/01-2021/03/31
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科研費以外石原・浅田研究助成 2016/04/01-2018/03/31
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科研費若手研究(B) 2015/04/01-2018/03/31

詳細表示...

論文

研究論文（国際会議プロシーディングス）共著 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.
研究論文（学術雑誌）共著 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...
研究論文（学術雑誌）共著 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.
研究論文（学術雑誌）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
研究論文（国際会議プロシーディングス）共著 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