Phenomenology of Elastic Properties in Martensite Alloys : II. Temperature Dependence of the Elastic Constant and Hysteresis Loop

概要

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Temperature dependence of the elastic stiffness constants in Martensite alloys with the symmetry change from the cubic m3^^-m to the tetragonal 4/mmm and the orthorhombic mmm symmetries was discussed on the basis of the Landau-type free energy function expressed in terms of the strain components, u_l, u_2 and u_3. It was found that an elastic stiffness constant corresponding to the shear deformation, which behaves as a soft mode, becomes extremely small in the vicinity of the transition temperature. The strain-stress hysteresis loops near the transition temperature and the morphotropic phase boundary in the Martensite alloys were also discussed on the basis of the Landau-type free energy function. It was found that the coercive strain field in the stress-strain hysteresis loop decreases with approaching the morphotropic phase boundary, and vanishes there, because there the Landau-type free energy function becomes isotropic in the order parameter space.
社団法人日本物理学会の論文
2003-11-15