期刊
ACTA MATERIALIA
卷 56, 期 20, 页码 6283-6290出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.08.059
关键词
Shape memory alloys; Adiabatic calorimetry; Martensitic transformation; Cu-Al-Ni; Optical microscopy
资金
- MCYT [MAT2004-03166]
- Spanish Ministry
- Basque Government [IT-434-07]
A thermodynamic study, based on high-sensitivity adiabatic calorimetry, of the martensitic transformation undergone by Cu-Al-Ni shape memory alloys is presented. From the specific heat data, the thermodynamic function values, and in particular the crystal free energy, as functions of temperature have been obtained. These results have permitted a careful estimation of the phase transformation temperatures of each beta(3)' martensite plate as function of its stored elastic energy. Within this frame, the distribution density of the elastic energy states in the martensitic phase is directly derived from the specific heat data. It also permits a simple analysis of the nucleation processes and gives a convincing explanation of the temperature memory effects. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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