Structural Relation between the X-Phase and other Phases in Ni₂MnGa

Abstract:

We have investigated stress and temperature dependences of the structure of the X-phase in Ni2MnGa to understand structural relation between the X-phase and other phases. Position and intensity of satellites of the X-phase are different from those of the intermediate (I-) phase under compressive stress, but they approach those of the I-phase with decreasing stress. That is, the structure change associated with the I → X transformation is discontinuous under a compressive stress, while it is continuous under zero stress. In addition, the transformation from the X-phase to the L21-type parent phase is continuous regardless of applied stress. These results strongly suggest the existence of multi-critical point in Ni2MnGa. On the other hand, the transformation from the X-phase to the martensite phase is discontinuous regardless of applied stress.

• Periodical: Materials Science Forum (Volume 635)
• Pages: 49-54
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.635.49
• Online since: December 2009
• Authors: Tomoyuki Kakeshita, Takashi Fukuda, Tomoyuki Terai, Toyotaka Osakabe, Kazuhisa Kakurai
• Keywords: Critical Phenomena, Ferromagnetic Shape Memory Alloys (FSMAs), Incommensurate Phase, Neutron Diffraction, Nickel-Manganese-Gallium Alloy

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