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The non-equilibrium thermodynamics of intracrystalline diffusion under non-hydrostatic stress

1997; Taylor & Francis; Volume: 75; Issue: 5 Linguagem: Inglês

10.1080/01418619708209853

0141-8610

Ichiko Shimizu,

Composite Material Mechanics

Abstract Intracrystalline diffusion induced by non-hydrostatic stress is formulated on the basis of the non-equilibrium thermodynamics of deformable solids. In the case of ideal solution, the chemical potential of the diffusing component a is expressed as where v is the molar volume, σ ij is the stress tensor, f is the molar Helmholtz free energy, δ ij is the Kronecker delta, ε ij represents the strain tensor of the crystal lattice, and the superscript a denotes the partial molar values of component a. The driving force of intracrystaline diffusion of component a is approximately -v(∂ε ij /∂Ca)∇σ ij . The lattice diffusion creep is reinterpreted in terms of .