Journal
SCRIPTA MATERIALIA
Volume 103, Issue -, Pages 30-33Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2015.02.030
Keywords
Ti-Ni-Cu-Pd alloy; Shape memory alloys (SMAs); Martensitic phase transformation; Thermodynamics; Transmission electron microscopy (TEM)
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Funding
- Natural Science Foundation of China [51171052, 51322102]
- 973 projects of China [2011CB012904, 2012CB619400]
- Doctoral Program Foundation of Institutions of Higher Education of China [20112302130006]
- Fundamental Research Funds for the Central Universities [HIT. BRET III 201201]
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After 5000 thermal cycles, the change of the transformation temperature is less than 1 degrees C in a Ti50.5Ni33.5Cu11.5Pd4.5 alloy. Also, the hysteresis becomes smaller nearing zero. Using thermal dynamic calculations, the elastic energy is nearly unchanged during the thermal cycles, which means there is little addition of the irreversible energy. The transmission electron microscopy observations show that the irreversible defects such as dislocations are rare in the reciprocating phase transition processes. Both of these explain the high thermal stability mechanism. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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