Dislocation creep is time-dependent crystal deformation through motion and interactions of dislocations. A common constitutive model is with , giving stress-dependent effective viscosity. Unlike diffusion creep, it often has weak grain-size dependence over the regime being modelled.
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Dislocation creep is a mechanism of plastic deformation that occurs in crystalline materials, particularly metals and geological materials, under conditions of high temperature and stress. It involves the movement of dislocations, which are line defects in the crystal structure. Key characteristics of dislocation creep include: 1. **Temperature Dependence**: Dislocation creep typically occurs at elevated temperatures (usually a significant fraction of the material's melting temperature) where atomic mobility is enhanced, allowing dislocations to move more freely.