Effect of heat aging on thermal and mechanical properties of Ti-Ni-Nb shape memory alloy

Takaei Yamamoto, Toshio Sakuma, Kazunari Uchida, Yuji Sutou, Kiyoshi Yamauchi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

This paper describes the effect of heat aging on thermal and mechanical properties of shape memory alloy. The materials used in this study are Ti-Ni-(6-12at%)Nb shape memory alloy. The tensile tests at 173 K and the heating-cooling tests under constrained strain condition were carried out using the specimens aged at 561 K for between 20 h and 1000 h in normal water chemistry. The martensite start temperature rapidly decreases in the initial short aging time, but there is little further decrease of the martensite start temperature with aging time more than 100 h. The recovery stress gradually increases with aging time, but on the contrary, the aging time of more than 500 h causes reduction of the recovery stress.

Original languageEnglish
Pages (from-to)439-444
Number of pages6
JournalMaterials Transactions
Volume48
Issue number3
DOIs
Publication statusPublished - 2007 Mar

Keywords

  • Aging
  • Recovery stress
  • Shape memory alloy
  • Titanium-nickel-niobium
  • Transformation temperature

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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