Martensitic transformations and superelastic behavior at low temperatures in Ti50-xNi40+xCu10

Yuta Kimura, Xiao Xu, Kodai Niitsu, Toshihiro Omori, Ryosuke Kainuma

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


In the present study, Ni content dependence of martensitic transformation behavior in Ti50-xNi40+xCu10 alloys (x = 0.03.0) was investigated, and then the superelastic behavior of a x = 2.4 alloy was examined at low temperatures. The Ti50-xNi40+xCu10 alloys are in B2 single-phase up to x = 2.4 at 1373 K. The B2/B19 and B19/B19A transformation temperatures decrease with increasing x and the lowest martensitic transformation starting temperature of 125K was detected. In the alloys with Ni compositions over x = 1.4, a pre-martensitic "intermediate" phase was detected by thermoanalysis measurements. While the middle eigenvalue λ2 is close to 1.0, which was found to be independent of the Ni content, the thermal hysteresis, Thys increases with increasing Ni content. This is explained by the drastic decrease in transformation entropy change. Although starting to drastically increase at temperatures below 100 K, the temperature dependence of stress hysteresis in compression testing is basically smaller than that in Ti48.2Ni51.8 binary alloy.

Original languageEnglish
Pages (from-to)269-277
Number of pages9
JournalMaterials Transactions
Issue number3
Publication statusPublished - 2016


  • Martensitic transformation
  • Shape memory alloy
  • Superelastic behavior
  • Titanium-nickel-copper


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