Abstract
The coherent phase transformation between two equilibrium single-phase states producing several orientation variants of the product phase is considered. The computer simulation shows that randomly distributed static defects may drastically change the thermodynamics, kinetics and morphology of the transformation and may lead to thermoelastic equilibrium. They are responsible for the appearance of two new fields in the phase diagram: (i) the two-phase field describing the tweed microstructure which consists of the retained parent phase and variants of the product phase and (ii) the single-phase field describing the tweed microstructure which consists of the variants of the product phase. These new fields can be attributed to the pre-transitional states observed in some of the displacive transformations. The microstructure evolution resulting in the formation of thermoelastic equilibrium is path dependent. This unusual behavior is expected in systems with a sharp dependence of the transition temperature on the defect concentration.
Published Version
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