Calorimetric analysis of the two way memory effect in a NiTi alloy -- Experiments and calculations
- Technical Univ. of Berlin (Germany). Inst. of Thermodynamics
In addition to the well known one-way memory effect in heating, some shape memory alloys may also exhibit a shape recovery upon cooling, i.e. they show the two-way memory effect (TWME). This is not an inherent property of such alloys, and to obtain it, the alloy must be trained. Besides the two-way memory effect, the training processes can also cause changes such as a shift of the transformation temperatures. In this work a calorimetric investigation of a one-way and two-way NiTi memory alloy is presented. The heat flow was measured by use of a Differential Scanning Calorimeter. The differences in the temperatures and enthalpy of transformations between one-way and two-way memory samples are presented, compared and discussed. A mathematical prediction of the heat and temperatures of transformation is presented.
- OSTI ID:
- 361733
- Journal Information:
- Scripta Materialia, Vol. 40, Issue 10; Other Information: PBD: 23 Apr 1999
- Country of Publication:
- United States
- Language:
- English
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