Grain boundary mobility and its effects in materials containing inert gases

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Abstract
The conditions under which grain boundaries can be pinned by solid precipitates are established but precipitates in the form of inert gas bubbles are known to move by surface diffusion of the matrix atoms which surround them and so they may remain attached to the boundary and merely retard its movement. The magnitude of this retarding force is calculated and the condition under which the boundary can become detached from the bubbles is evaluated. Detachment occurs most readily from bubbles of a critical size and under conditions where there is a large driving force for grain boundary movement. The smallest bubbles move sufficiently rapidly that they tend to remain attached to the boundary, whereas the largest bubbles, for a given spacing, have greatest effect in impeding grain boundary mobility. Their effect is compared and contrasted with that of boundary pinning by solid precipitates. The analysis is used to interpret observations of the behaviour of fission gases after grain boundary movement.

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