Abstract
The nature of dislocations emitted from cracks introduced in a thin foil of LaNi 5 has been characterized by means of transmission electron microscopy. Dislocations emitted from cracks are determined to be of the c-type ( b (Burgers vector)=[0001]) moving on {101̄0} prism planes. Although grown-in dislocations of the a-type ( b=1/3〈112̄0〉) locate near cracks where the emission of c-type dislocations occurred, these a-type dislocations are not observed in motion, indicating the difficulty in the motion of a-type dislocations. The implications of these results for controlling the extent of cracking during cycles of hydriding–dehydriding of alloys based on LaNi 5 are discussed.
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