Papers 【 display / non-display 】

Papers 【 display / non-display 】

• Preferential Dynamic Grain Growth Mechanism Enabling the Control of Microstructure and Texture by High Temperature Deformation: Experimental Evidence and Applicability

  Fukutomi Hiroshi, Okayasu Kazuto, Onuki Yusuke, Hasegawa Makoto, Kobayashi Equo, Strnadel Bohumir, … Show more authors

  MATERIALS TRANSACTIONS   63 ( 2 )   148 - 156   2022.2  [Reviewed]

  DOI CiNii Research

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  Language：English   Publishing type：Research paper (scientific journal)   Publisher：公益社団法人 日本金属学会   Joint Work  

  <p>The relationship between the mechanism of high temperature deformation and the evolution behavior of microstructure and the texture during deformation, which has been found in various solid solution alloys, is clarified. It is shown that the preferential dynamic grain growth (PDGG) mechanism proposed by the authors can explain the behavior of microstructure change as well as texture change of all studied alloys without contradiction. The essential aspect of the PDGG mechanism is the preferential growth of crystal grains with the orientation stable for deformation and with low Taylor factor in the given deformation mode. It is concluded that the Taylor factor corresponds to dislocation density and stored energy during the high temperature deformation of solid solution alloys when viscous glide of dislocations is the rate controlling process. The possibility of the occurrence of the PDGG mechanism in materials other than solid solution alloys is also discussed.</p>

  Other Link： https://cir.nii.ac.jp/crid/1390290846626516352

• Texture Control of Fe-Mn-Si-Cr Alloy by the Preferential Dynamic Grain Growth Mechanism and the Improvement of Shape Memory Characteristics

  Fukutomi Hiroshi, Suzuki Shigeru, Nakajima Itaru, Okayasu Kazuto, Hasegawa Makoto, Onuki Yusuke

  Tetsu-to-Hagane   107 ( 4 )   312 - 320   2021.4  [Reviewed]

  DOI Web of Science CiNii Research

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  Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Iron and Steel Institute of Japan   Joint Work  

  Other Link： https://ci.nii.ac.jp/naid/130008009135

• Mechanism of Texture and Microstructure Evolution during High Temperature Plane Strain Compression in AZ31B and AZ80 Magnesium Alloys with Various Initial Textures

  Fukutomi Hiroshi, Park Hyung-Gyun, Kim Kwon-Hoo, Okayasu Kazuto, Hasegawa Makoto, Umezawa Osamu

  Journal of the Japan Institute of Metals and Materials   83 ( 8 )   264 - 272   2019.8  [Reviewed]

  DOI CiNii Research

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  Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Institute of Metals and Materials   Joint Work  

  <p>The effects of pre-existent textures on the evolution behaviors of microstructure and texture at high-temperature plane strain compression deformation of AZ31B magnesium alloy have been studied. Deformation is conducted at 723 K with a strain rate of 5.0 &times; 10^&minus;2 s^&minus;1, up to &minus;1.3 in true strain. When non-basal slip systems are the primary slip systems, {11<span style="text-decoration: overline;">2</span>0}<10<span style="text-decoration: overline;">1</span>0> texture develops. In this case, repeated change in microstructure and texture which was found in the previous work appeared with increasing strain. Namely, replacement of {11<span style="text-decoration: overline;">2</span>0}<10<span style="text-decoration: overline;">1</span>0> texture with {10<span style="text-decoration: overline;">1</span>0}<11<span style="text-decoration: overline;">2</span>0> texture and the reverse phenomenon occurs. While the {11<span style="text-decoration: overline;">2</span>0}<10<span style="text-decoration: overline;">1</span>0> oriented grains are small and with wavy shaped grain boundaries, the {10<span style="text-decoration: overline;">1</span>0}<11<span style="text-decoration: overline;">2</span>0> oriented grains are large and with rather straight grain boundaries. The mechanism of repeated change in microstructure and texture is discussed on the basis of preferential dynamic grain growth mechanism proposed by the authors.</p>

  Other Link： https://ci.nii.ac.jp/naid/130007683520

• Effect of Large Strain on Texture Formation Behavior of AZ80 Magnesium Alloy during High Temperature Deformation

  Kwon Hoo Kim, Kazuto Okayasu, Hiroshi Fukutomi

  Materials Science Forum   879   938 - 942   2017  [Reviewed]

  DOI

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  Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Scientific.Net   Joint Work  

  Other Link： https://www.scientific.net/MSF.879

• Unprecedented Alternating Change in Microstructure and Texture of AZ31 Magnesium Alloy under High-Temperature Plane Strain Compression

  Hyung-Gyun Park, Kwon-Hoo Kim, Kazuto Okayasu, Makoto Hasegawa, Hiroshi Fukutomi

  Journal of the Japan Institute of Metals and Materials   80 ( 10 )   612 - 619   2016.10  [Reviewed]

  DOI Web of Science CiNii Research

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  Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Institute of Metals and Materials   Joint Work  

  Other Link： https://www.jstage.jst.go.jp/article/jinstmet/80/10/80_J2016011/_article/-char/en

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Review Papers 【 display / non-display 】

Review Papers 【 display / non-display 】

• Introduction to Crystallographic Texture -Expression Methods and Formation Processes-

  Hiroshi FUKUTOMI and Kazuto OAKAYASU

  Journal of the Japan Society for Technology of Plasticity   54 ( 2 )   91 - 95   2013.2

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  Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Joint Work  

  Other Link： https://www.jstage.jst.go.jp/article/sosei/54/625/54_91/_article/-char/en

Industrial Property Rights 【 display / non-display 】

Industrial Property Rights 【 display / non-display 】

• 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

  Hiroshi Fukutomi, Kazuto OKayasu, Yusuke Onuki

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  Applicant：National University Corporation, Yokohama National University

  Application no：2012-501909  Date applied：2011.2.28

  Announcement no：WO2011/105609A1  Date announced：2011.9.1

  Patent/Registration no：5492975  Date issued：2014.3.7

  Country of applicant：Domestic  

Awards 【 display / non-display 】

Awards 【 display / non-display 】

• 71st The Japan Institute of Metals and Materials The Best Paper Award

  2023.9   The Japan Institute of Metals and Materials   Preferential Dynamic Grain Growth Mechanism Enabling the Control of Microstructure and Texture by High Temperature Deformation: Experimental Evidence and Applicability

  Individual or group name of awards：Hiroshi Fukutomi, Kazuto Okayasu, Yusuke Onuki, Makoto Hasegawa, Equo Kobayashi, Bohumir Strnadel, Osamu Umezawa

• Kanto branch distinguished service awar

  2022.3   The Japan Institute of Light Metals  

  Individual or group name of awards：Kazuto Okayasu

• AY2014 Best Paper Award of The Japan Society for Heat Treatment (scientific paper)

  2013.6   The Japan Society for Heat Treatment   Deformation Behavior and Texture Formation in AZ80 Magnesium Alloy during Uniaxial Compression Deformation at High Temperatures

  Individual or group name of awards：Jinuk(Kwonhoo) KIM, Kazuto OKAYASU, Hiroshi FUKUTOMI

Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• Fabrication of magnetic efficiency evaluation device for electromagnetic steel sheet with ideal crystal orientation

  2016.4 - 2017.3

  Grant-in-Aid for Scientific Research  Grant-in-Aid for Encouragement of Scientists

  Investigator(s)：Kazuto OKAYASU

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  Grant type：Competitive

• Basic research for improvement of bendability in aluminum alloy using single crystal sample

  2010.4 - 2011.3

  Grant-in-Aid for Scientific Research  Grant-in-Aid for Encouragement of Scientists

  Investigator(s)：Kazuto OKAYASU

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  Grant type：Competitive

Other external funds procured 【 display / non-display 】

Other external funds procured 【 display / non-display 】

• 5th International Conference on Recrystallization & Grain Growth

  2013.5

  Local Government 

  Investigator(s)：Kazuto OKAYASU

Committee Memberships 【 display / non-display 】

Committee Memberships 【 display / non-display 】

• 125th JILM Annual Meeting exective committee

  2013.2 - 2013.11  exective committee

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  Committee type：Academic society 

• 123rd JILM Annual meeting executive committee

  2012.2 - 2012.11  executive committee

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  Committee type：Academic society 

Social Contribution(Extension lecture) 【 display / non-display 】

Social Contribution(Extension lecture) 【 display / non-display 】

• 平成24年度GMI講座「結晶配向評価講座ー座学と実習ー

  Role(s)： Lecturer

  グリーンマテリアルイノベーション研究拠点  横浜国立大学  2012.10

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  Audience： Researchers,　Company

  Type：Seminar, workshop

• 集合組織の測定実習（EBSD, XRD）

  Role(s)： Lecturer

  日本塑性加工学会　東京・南関東支部若手の会第9回勉強会  横浜国立大学  2010.12

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  Audience： Researchers

  Type：Seminar, workshop

• 軽金属基礎技術講座「集合組織の測定法」

  Role(s)： Lecturer

  軽金属学会  横浜国立大学  2009.4

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  Audience： Researchers

  Type：Seminar, workshop