Diffusional material creep dominated by grain-boundary transport. An ideal scaling is . Its stronger grain-size dependence and typically lower transport activation energy distinguish it from bulk-diffusion material creep.
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Coble creep refers to a specific mechanism of creep deformation that occurs in materials, particularly ceramics and polycrystalline materials, at elevated temperatures. It is named after the materials scientist R. L. Coble, who characterized this mode of creep in the context of grain boundary sliding in polycrystalline materials. The mechanism of Coble creep involves the movement of atoms along grain boundaries. This is typically observed in materials with a fine-grained microstructure at temperatures close to their melting point.