Mechanical models of the effect of grain boundary sliding on creep and creep rupture

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Abstract
The influence of grain boundary sliding on the mechanical behaviour of materials subject to creep at elevated temperatures has been investigated by a number of model analyses. Some models have focussed on the interaction of linearly viscous behaviour in the grain boundaries and power-law creep of the grains. It is found that there is a transition range such that at higher stresses sliding has little influence, while at lower stresses sliding accelerates creep. Other investigations have focussed on the effect of sliding on intergranular creep fracture. Freely sliding grain boundaries give much reduced rupture times, and the behaviour is rather strongly affected by whether the cavitating grain boundary facets are closely-spaced or well-separated