Comparison of Reverse Transformation Behaviors of Thermally- and Deformation-Induced ε-Martensite in Fe-28Mn-6Si-5Cr Shape Memory Alloy

• Tasaki Wataru

  National Institute for Materials Science University of Tsukuba

• Tsuchiya Koichi

  National Institute for Materials Science University of Tsukuba

• Sawaguchi Takahiro

  National Institute for Materials Science

• Takamori Susumu

  National Institute for Materials Science

抄録

Reverse transformation behavior and the microstructures of ε-martensite induced by two different methods of cooling and deformation in Fe-28Mn-6Si-5Cr shape memory alloy was investigated. In situ heating X-ray diffraction (up to 673 K) was applied to the cooled and deformed specimens to observe the reverse transformation behavior. The microstructures in the cooled and deformed specimens were analyzed by electron backscattering diffraction. From X-ray diffraction patterns, the reverse transformation start temperature (A_s) in the deformed specimens was found to be lower than that in the cooled specimen, while the reverse transformation finish temperature (A_f) in the deformed specimens was higher than that in the cooled specimen. The electron back-scattering diffraction (EBSD) analysis revealed a higher fraction of low-angle misorientation boundaries in γ-austenite and ε-martensite in the deformed specimens than in the cooled specimens. Intersections of different ε-martensite variants with ε-twin were observed in the deformed specimens, while such intersections were not observed in the cooled specimens. A heterogeneous mixture of plastically deformed ε-martensite and γ-austenite were found in deformed specimens. It is considered that the heterogeneity of the microstructures led to the difference in reverse transformation temperatures of A_s and A_f in the thermally-induced and deformation induced maretnsites.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 57 (10), 1707-1713, 2016

  公益社団法人 日本金属学会

キーワード

• ε-martensite
• martensitic transformation
• reverse transformation
• shape memory alloy
• electron backscattering diffraction
• X-ray diffraction

詳細情報

• CRID: 1390001204254880640
• NII論文ID: 130005289902
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.maw201607
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 027621472
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I027621472
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/57/10/57_MAW201607/_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