Martensitic transformation behaviors with various Ni contents in Ti50-xNi40+xCu10.0 alloys

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In the present study, Ni content dependence of martensitic transformation (MT) temperatures in Ti50-xNi40+ xCu10.0 alloys (X= 0.0-3.0) was investigated in order to reveal the MT behavior at low temperatures. The Ti-Ni-Cu alloys are in B2 single- phase up to 42.4 at% Ni at 1363 K. B2/B19 or B19/B19' MT temperatures decrease with increasing Ni and a lowest temperature of 124 K was detected. In the alloys with Ni compositions over 41.2 at%, pre-martensitic "intermediate" phase was detected by specific heat measurement. While the middle eigenvalue λ2 are close to 1.0, which were found independent of the Ni content, the thermal hysteresis, Δ T hys, increases with increasing Ni content, which is explained by drastic decrease in transformation entropy change.

Original languageEnglish
Pages (from-to)434-440
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number9
Publication statusPublished - 2015 Sept


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


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