Abstract
The evolution of polytwinned martensitic variants, which accompanies changes in various energies under applied stress, is investigated using a 3-dimensional phase-field simulation. The intrinsic origin of the rubber-like behavior (RLB) in a thermoelastic alloy is revealed as the disappearance of one variant during loading and its reappearance during unloading, whereas long “stress aging” enhances martensite stabilization. The applied stress and elastic strain energies drive the respective microstructural evolution and its reversal. This intrinsic origin of the RLB cannot be excluded in thermoelastic alloys for which the RLB can be explained by “symmetry conforming-short range order” principle.
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