Influence of Heat Treatment on Phase Transformation of Ni-rich TiNi Foils Produced via Ultrafine Laminates

Dacian Tomus; Koichi Tsuchiya; Takeshi Nagano; Akihide Hosokawa; Toshiki Ohmori; Masahiro Sasaki; Yoshikazu Todaka; Minoru Umemoto

doi:10.2320/matertrans.45.219

Influence of Heat Treatment on Phase Transformation of Ni-rich TiNi Foils Produced via Ultrafine Laminates

Dacian Tomus, Koichi Tsuchiya, Takeshi Nagano, Akihide Hosokawa, Toshiki Ohmori, Masahiro Sasaki, Yoshikazu Todaka, Minoru Umemoto

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Keywords: shape memory alloy, multilayer, titanium-nickel, martensitic transformation

JOURNAL FREE ACCESS

2004 Volume 45 Issue 2 Pages 219-224

DOI https://doi.org/10.2320/matertrans.45.219

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Abstract

Using the ultrafine laminate method, thin foils (50 μm) of Ni-rich TiNi shape memory alloys were produced. Overall composition of the Ti/Ni laminate is Ti-50.7%Ni. TiNi (B2) phase was obtained after different diffusion treatments at 1073 K for 259.2 ks and 1173 K for 36 ks and 259.2 ks. Aging treatments at 773 K for 3.6, 18, 36, 72 and 144 ks were also performed. Multiple step martensitic transformation was observed for aged samples. The shape memory strain was 3.69 × 10⁻² in the sample aged at 773 K for 18 ks.

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