Phase-field modelling of paramagnetic austenite–ferromagnetic martensite transformation coupled with mechanics and micromagnetics

Dominik Ohmer, Min Yi, Oliver Gutfleisch, Bai-Xiang Xu

International Journal of Solids and Structures 238 (2022) 111365.

With the goal of simulating the multi-stimuli concept, we propose a multi-physics phase-field model for the simulation of a tetragonal martensite and cubic austenite. The phase-field model is based on a Landau 2-3-4 polynomial with temperature-dependent coefficients to allow for the simulation of the transition between the martensite and austenite state. For the magnetic martensite state, the ferroelastic and -magnetic domain structures for typical magnetic shape memory alloys (MSMA) were simulated together with the influence of external stimuli on these. Application of uniaxial pressure and magnetic fields during the simulation of the martensite-austenite transition resulted in a shift of the transition temperature towards higher temperatures compared to no stimulus applied.

DOI: 10.1016/j.ijsolstr.2021.111365