Relation between Tensile Deformation Behavior and Microstructure in a Ti-Ni-Co Shape Memory Alloy

• Kishi Yoichi

  AMS R&D Center, Kanazawa Institute of Technology

• Yajima Zenjiro

  AMS R&D Center, Kanazawa Institute of Technology

• Shimizu Ken’ichi

  AMS R&D Center, Kanazawa Institute of Technology

抄録

Relation between tensile deformation behavior and microstructure in variously aged Ti–49.7 at%Ni–1.3 at%Co shape memory alloys has been investigated. Stress-strain curves for the alloys aged at 623 K and 723 K for 1.8 ks were of a work-hardening type, but those for the alloys aged at the two temperatures over 28.8 ks were nearly of a constant-stress type, as for binary Ti–51 at%Ni aged alloys. Lenticular precipitates were observed in both the 623 K and 723 K aged alloys, and the distance among the precipitates increased with increasing aging temperature and period, as well as the size of the precipitates. The lenticular precipitates were identified to be of the composition of Ti₃(Ni, Co)₄ from an EDX analysis. Based on these observations, the constant-stress type stress-strain behavior for the alloys aged over 28.8 ks was attributed to some composition change accompanied with the aging progress by which Ti:(Ni+Co) composition ratio in the matrix of the Ti–Ni–Co alloys approached 1:1, as in the equi-atomic Ti–Ni binary alloys.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 43 (5), 834-839, 2002

  公益社団法人 日本金属学会

キーワード

• shape memory alloy
• stress-strain behavior
• precipitate
• transmission electron microscope
• martensitic transformation
• R-phase

詳細情報

• CRID: 1390001204246962944
• NII論文ID: 10012322797
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.43.834
• COI: 1:CAS:528:DC%2BD38Xlt1ensbo%3D
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 6179436
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6179436
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/43/5/43_5_834/_pdf
• 本文言語コード: en
• データソース種別:
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  • NDL
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• 抄録ライセンスフラグ: 使用不可