Abstract
In this work, we present a theoretical study of the thermal hysteresis that takes place across the first order martensitic transition as a function of temperature for Heusler alloys. To simulate the structural phase transitions, we propose the degenerate three-state Blume-Emery-Griffiths (BEG) Hamiltonian taking into account the temperature-dependent lattice entropy expansion in the framework of quasi-harmonic Debye model. It is shown that the hysteresis width of structural transformation between cubic austenite and tetragonal martensite depends on the difference between σTM and σTA variables.
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