材料科学における界面ダイナミクス(<特集>パターンダイナミクス)

抄録

We formulate a theory of the aging phenomena in shape memory alloys. In our model equations, the order parameter of the martensitic transformation is coupled with a secondary variable which follows the evolution of the order parameter but is assumed to be an extremely slow variable. From this set of equations, we derive the interface (twin boundary) equation of motion. Solving the interface equation, the stress-strain relation is obtained by taking account of the aging effect. The results are found to be consistent, at least qualitatively, with experiments.