Nonthermoelastic martensitic features in ideal martensites due to volume effects

We study martensitic transformation behavior by considering the coupling of volumetric strain and the transformation strain in a group-subgroup transformation within a Ginzburg-Landau framework. Nonthermoelastic features, including large residual strain, large thermal hysteresis, and incomplete transformation gradually, appear with increasing coupling strength. The volume change associated with the transformation due to the coupling is demonstrated to be the essential physics for nonthermoelastic features that appear in an ideal thermoelastic martensitic transformation. A materials descriptor for features associated with a martensitic transformation is proposed based on insights from the model.