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

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  • Fukutomi Hiroshi
    Kanagawa Study Center, The Open University of Japan Centre for Advanced and Innovative Technologies, Technical University of Ostrava
  • Okayasu Kazuto
    Division of Systems Research, Faculty of Engineering, Yokohama National University
  • Onuki Yusuke
    Frontier Research Center for Applied Atomic Sciences, Ibaraki University
  • Hasegawa Makoto
    Centre for Advanced and Innovative Technologies, Technical University of Ostrava Division of Systems Research, Faculty of Engineering, Yokohama National University
  • Kobayashi Equo
    Centre for Advanced and Innovative Technologies, Technical University of Ostrava Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
  • Strnadel Bohumir
    Centre for Advanced and Innovative Technologies, Technical University of Ostrava
  • Umezawa Osamu
    Centre for Advanced and Innovative Technologies, Technical University of Ostrava Division of Systems Research, Faculty of Engineering, Yokohama National University

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<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>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 63 (2), 148-156, 2022-02-01

    公益社団法人 日本金属学会

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