The diffusion-controlled growth of grain-boundary voids under an applied stress has been examined by considering the change in the overall Gibbs free energy of a material containing a void.The present new approach enables us to derive the void growth rate without knowing a local stress field at a grain boundary.Comparison with previous studies has revealed that when the same basic assumptions are employed, exactly the same expressions of the void growth rate as those given in the previous studies can be derived in a much simpler manner.The origins of the differences in various previous expressions for the void growth rate are also discussed.
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Onaka et al. (1988) studied this question.
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