Phase Transition from BCC Phase in Fe-Mn-based Alloys with Anomalously Small Entropy Change

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The martensitic transformation from the alpha phase (BCC) to the gamma phase (FCC) in Fe-based alloys including Fe-Mn-Al-based alloy was investigated. It was found from the thermodynamic analysis that this phase transformation can occur due to the suppression of the magnetism of the alpha phase. It was also found that the thermoelastic transformation is obtained by the addition of Ni. Moreover, the Fe-Mn-Al-Ni alloy exhibits the superelasticity in a wide temperature range. The superelastic strain was strongly dependent on the microstructure and the grain size control was one of the most important factors.