Intermartensitic transformation of Ni-Fe-Ga magnetic shape memory alloys
Ni-Fe-Ga磁致形状记忆合金中间马氏体相变

Differential scanning calorimetry (DSC) and x-ray diffraction (XRD) have been used to probe the martensitic transformation behaviors of Ni-Fe-Ga magnetic shape memory alloys. A complete intermartensitic transformation was observed in polycrystalline Ni 56.5 Fe 19.0 Ga 24.5 and Ni 56.3 Fe 17.0 Ga 26.7 alloys, which is stimulated by the change of temperature and includes an intermartensitic transformation and the corresponding retransformation. The intermartensitic transformation and the martensitic transformation are both thermoelastic and the martensitic phases existing at room temperature are characterized as a monoclinic 14M structure.