Thermodynamics and Kinetics of Phase and Twin Boundaries
This chapter describes a framework for studying the propagation of singular interfaces such as phase and twin boundaries in multicomponent bodies. The balance equations for mass, energy and entropy at an interface between two phases are examined in detail. The chemical and mechanical contributions to the total thermodynamic driving force are identified for both ideal and real interfaces. Transformation kinetics, based on these thermodynamic driving forces, is formulated for the martensitic and diffusional transformations. The framework is illustrated by two examples, the first estimates the thickness of a deformation twin, and the second describes the growth of an allotriomorphic ferrite film at the expense of the austenitic phase.
KeywordsMartensitic Transformation Twin Boundary Parent Phase Resolve Shear Stress Solute Drag
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