Grain Subdivision Mechanism Related to Partial Disclinations in Severe Plastic Deformation: A Molecular Dynamics Study

• Shimokawa Tomotsugu

  Faculty of Mechanical Engineering, Kanazawa University

• Yamashita Tomoaki

  Division of Mechanical Science and Engineering

• Niiyama Tomoaki

  College of Science and Engineering, Kanazawa University

• Tsuji Nobuhiro

  Department of Materials Science and Engineering, Kyoto University Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University

Abstract

Severe plastic deformation (SPD) processes can produce the bulk ultrafine-grained metals with grain sizes of less than 1 μm. However, the mechanism of grain refinement during SPD is not completely understood. In this study, we perform molecular dynamics simulations of a SPD process like equal-channel angular pressing and demonstrate grain refinement phenomena during the SPD simulations. We propose a new mechanism of grain subdivision related to the mobility of partial disclinations formed in strain-gradient regions during SPD.

Journal

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 57 (9), 1392-1398, 2016

  The Japan Institute of Metals and Materials

Keywords

• grain refinement
• grain subdivision
• severe plastic deformation
• geometrically necessary boundary
• disclination
• molecular dynamics

Details

• CRID: 1390001204253005952
• NII Article ID: 40020922316
• NII Article ID: 130005434978
• NII Book ID: AA1151294X
• DOI: 10.2320/matertrans.mh201518
• ISSN: 13475320
• ISSN: 13459678
• NDL BIB ID: 027571006
• Web Site: http://id.ndl.go.jp/bib/027571006
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I027571006
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/57/9/57_MH201518/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed