Martensite transformation and shape memory effect of NiTi-Zr high-temperature shape memory alloys

Zhongjie J. Pu; Hsien-Kuei Tseng; Kuang-Hsi Wu

doi:10.1117/12.209815

22 May 1995 Martensite transformation and shape memory effect of NiTi-Zr high-temperature shape memory alloys

Zhongjie J. Pu, Hsien-Kuei Tseng, Kuang-Hsi Wu

Proceedings Volume 2441, Smart Structures and Materials 1995: Smart Materials; (1995) https://doi.org/10.1117/12.209815
Event: Smart Structures and Materials '95, 1995, San Diego, CA, United States

Abstract

NiTi-Zr high temperature alloys possess relatively poor shape memory properties and ductility in comparison with NiTi-Hf and NiTi-Pd alloys. During martensite transformation of the newly developed NiTi-Zr high temperature shape memory alloys (SMAs) the temperature increases along with Zr content when the Zr content is more than 10 at%. As the Zr content increases, the fully reversible strain of the alloys decreases. However, complete strain recovery behavior is exhibited by all the alloys studied in this paper, even those with a Zr content of 20 at%. Stability of the NiTi-Zr alloys during thermal cycling was also tested and results indicate that the NiTi-Zr alloys have poor stability against thermal cycling. The reasons for the deterioration of the shape memory effect and stability have yet to be determined.

Citation Download Citation

Zhongjie J. Pu, Hsien-Kuei Tseng, and Kuang-Hsi Wu "Martensite transformation and shape memory effect of NiTi-Zr high-temperature shape memory alloys", Proc. SPIE 2441, Smart Structures and Materials 1995: Smart Materials, (22 May 1995); https://doi.org/10.1117/12.209815

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