Abstract
Reactions between the leading partial dislocations of extended defects lying on intersecting slip planes are observed by transmission electron microscopy (TEM) in samples indented at room temperature and 1000°C. The resultant dislocation is shared by the original defects. Annealing experiments performed at 1000°C for 5 hours indicate that the new configurations are stable and sessile and therefore can limit plastic flow. These reactions may also lead to crack nucleation via a mechanism similar to that proposed by Cottrell for b.c.c. metals. This mechanism may explain the observation of cracks on {11 2 ̄ 0} and {1 1 ̄ 00} planes generated at slip band intersections.
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