| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1617057 | Journal of Alloys and Compounds | 2011 | 4 Pages |
Ni2MnGa transforms in the cooling process from the parent (P-) phase to the intermediate (I-) phase and then to the martensite (M-) phase. Under a uniaxial stress, a new phase (X-phase) appears, and the P → I transformation distinctively separates to the P → X, and the X → I transformations. In the present study, we have studied the effect of hydrostatic pressure on these transformation temperatures. As a result, we found that the distinct separation described above does not occur under a hydrostatic pressure of up to 0.9 GPa. The P → X and the I → M transformation temperatures increase with increasing hydrostatic pressure, and the ratio is 13.1 K/GPa and 16.2 K/GPa, respectively. The change in molar volume and/or thermal expansion coefficient associated with the transformation is estimated from these values.
► There are four solid phases (P, X, I, M) in Ni2MnGa. ► The P–X and I–M transformation temperatures increase with increasing hydrostatic pressure. ► The X–I transformation temperature is almost independent of hydrostatic pressure. ► The volume change associated with these transformations is calculated using Clausius–Claperyron equation.
