Softening and Microstructural Coarsening without Twin Formation in FCC Metals with Low Stacking Fault Energy after Processing by High-Pressure Torsion

• Matsunaga Hirotaka

  Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University

• Horita Zenji

  Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University

抄録

Gold (Au), silver (Ag) and copper (Cu) were severely deformed through the process of high pressure torsion (HPT). The grain sizes were reduced to the submicrometer range and the hardness increased significantly by the HPT process. However, after holding at room temperature, Au and Ag exhibited grain growth and thus softening without heating. The softening and microstrcutural coarsening occurred rather quickly in Ag and moderately in Au but nothing changed in Cu even after keeping for prolonged time. No twins were formed along with the grain growth in the HPT-processed Au and Ag. High density lattice defects and enhanced diffusivity in the metals are responsible for such an unusual softening behavior.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 50 (7), 1633-1637, 2009

  公益社団法人 日本金属学会

キーワード

• severe plastic deformation
• high pressure torsion
• gold
• silver
• copper
• grain growth
• twin
• stacking fault energy

詳細情報

• CRID: 1390001204249380992
• NII論文ID: 10025153652
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.mf200921
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 10265664
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10265664
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/50/7/50_MF200921/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可