An experimental study has been made of the interrelation of grain boundary sliding, crystal deformation and intergranular fracture during creep of copper bicrystals. The observed sliding behaviour was analysed on the basis of the movement of lattice dislocations along the grain boundary. The results show that grain boundary sliding is essentially responsible for intergranular fracture and that ledges produced by crystal deformation can act as efficient nucleation sites of grain boundary cavities. A microcavitation mechanism has been proposed which can explain the observed fracture behaviour of sliding grain boundaries having the tensile and/or compressive ledges.
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Watanabe et al. (1978) studied this question.
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