Abstract
An NiAl alloy, heat treated so as to obtain coherent precipitates 46.0 nm in diameter, was cycled under constant plastic strain amplitude. Transmission electron microscopy replicas were stripped from the specimen surface at various stages in the cycling to record the fine surface details. Surface microcracks, as small as 45 nm, were easily observable and occurred in “families” lying parallel to the surface slip lines. Continued cyclic straining caused microcracking again in families along slip lines but these cracks were aligned along secondary slip line directions. Interconnection of the former type of microcracks led to microcrack growth which displayed straight planar cracking patterns, while growth of the latter resulted in zigzag cracking patterns.
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