Thermal cycling effects in Cu-Zn-Al shape memory alloy by positron lifetime measurements
- Zhongshan Univ., Guangzhou (China). Dept. of Physics
- City Univ. of Hong Kong (Hong Kong). Dept. of Physics and Materials Science
This paper presents the results of an investigation on the effects of thermal cycling on the transformation and memory properties of a CuZnAl shape memory alloy. The positron annihilation technique was used to elucidate the micro-mechanism of transformation during thermal cycling. The present paper shows that martensite finish temperature and austenite start temperature of CuZuAl shape memory material will decrease with increasing number of thermal cycles, while martensite start temperature and austenite finish temperature remain constant. On the other hand, the thermal hysteresis will decrease and the shape memory strain will remain constant. The thermal cycling behavior is closely related to the formation of vacancy clusters by vacancy agglomeration.
- OSTI ID:
- 69684
- Journal Information:
- Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 11 Vol. 32; ISSN 0956-716X; ISSN SCRMEX
- Country of Publication:
- United States
- Language:
- English
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