Abstract
AbstractThe diffusional matter transport in grain boundaries under the influence of stress fields is discussed. The most important relations, connected with the scaling behaviour of the basic equations, can be deduced from simple estimates. On this basis it is shown (1) that the range of a matter inhomogeneity in a grain boundary and that of the related stress field develop in time as t1/3, (2) that in the early stage the diffusional creep deformation goes with t2/3, (3) that under constant stress isolated grain‐boundary voids grow with constant volume growth rate. The time to brittle fracture caused by simultaneous nucleation and growth of grain‐boundary voids is discussed.
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