Abstract
Grain-boundary sliding is the relative translation of a pair of grains by a shear movement at their common interface. This definition is meant to include cases where shear takes place in a zone of finite width around the boundary, and cases in which sliding is a shear confined completely to the interface, if indeed this latter ever actually occurs in practice. It becomes important as a mode of deformation at elevated temperatures (above ∼0.45 of the absolute melting temperature) and is believed to play an important part in promoting inter-crystalline weakness common in metals at such temperatures
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