Stress-Temperature Phase Diagram of Ni₂MnGa and Structural Relations between its Constituent Phases

Abstract:

The ferromagnetic shape memory alloy Ni2MnGa exhibits a successive martensitic transformation from the L21-type structure to the so-called intermediate phase and then to the martensite phase with an incommensurate structure during cooling under zero stress. In addition to these phases, a new phase, which we call the X-phase, appears when Ni2MnGa is cooled under compressive stress applied in the [001] direction. In this paper, we discuss the structural relations between the X-phase and the other phases on the basis of experimental results of compressive tests, transmission electron microscope observations and neutron diffraction patterns. It is likely that a multicritical point exists in the stress-temperature phase diagram of Ni2MnGa.

• Periodical: Materials Science Forum (Volume 684)
• Pages: 61-71
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.684.61
• Online since: May 2011
• Authors: Takashi Fukuda, Tomoyuki Terai, Hidefumi Maeda, Tomoyuki Kakeshita
• Keywords: Ferromagnetic Shape Memory Alloys (FSMAs), Incommensurate Structure, Single Crystal, Stress-Induced Transformation

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