Martensite transformation and shape memory effect on NiTi-Zr high temperature shape memory alloys
Technical Report
·
OSTI ID:253881
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.
- Research Organization:
- Florida International Univ., Miami, FL (United States). Dept. of Mechanical Engineering
- OSTI ID:
- 253881
- Report Number(s):
- AD-A--304285/0/XAB; CNN: Contract DAAL03-91-G-0245
- Country of Publication:
- United States
- Language:
- English
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