Volume Change During Intermartensitic Transformations in Ni-Mn-Ga Alloy
Abstract
Characteristics of phase transitions in Ni54Mn24Ga22 alloy were studied at different hydrostatic pressures to shed light on the nature and mechanisms of intermartensitic transformations. The temperature dependence of resistivity of the alloy was used to find characteristic temperatures of martensitic and intermartensitic transformations as a function of hydrostatic pressure. The latent heat of these transformations was determined by differential scanning calorimetry. The transformation volume effects were calculated using Clausius-Clapeyron equation. They make up 0.082% for martensitic and 0.024% for intermartensitic transformations.
- Publication:
-
Journal of Materials Engineering and Performance
- Pub Date:
- September 2014
- DOI:
- 10.1007/s11665-014-1095-4
- Bibcode:
- 2014JMEP...23.3180P
- Keywords:
-
- hydrostatic pressure;
- martensitic transformation;
- volume effect