A MICROMECHANICS-BASED THERMODYNAMIC MODEL FOR MARTENSITIC VARIANT REORIENTATION IN MAGNETIC SHAPE MEMORY ALLOYS

摘要

In this paper, combined the micromechanical and the thermodynamic theory, a constitutive model for magnetic shape memory alloys is developed. The model is applied to a NiMnGa single-crystal specimen under a constant compressive axial stress. Model predictions of magnetic field-reorientation strain hysteresis loops under different applied stresses are discussed. The theoretical results are found to be in general agreement with experimental data.