A model for field-induced reorientation strain in magnetic shape memory alloys at different temperatures

摘要

A constitutive model for magnetic shape memory alloys is developed through a combined consideration of micromechanical and thermodynamic theories. A kinetic equation is set up to calculate the volume fraction of martensite variants for a given stress, temperature and magnetic field. The model is applied to a NiMnGa single-crystal specimen at different temperature. The theoretical results are found to be in general agreement with experimental data. It has shown that the method is accurate and simple.