Abstract
It has long been recognized that the process of fatigue crack growth (FCG) in vacuum differs from that in air. FCG rates in vacuum are slower than in air and the fracture surfaces differ in that fatigue striations, if not present at all, are as not as well defined in vacuum as in air. Furthermore, for similar cycling conditions the crack tip opening displacement and the plastic zone are both larger in vacuum than in air. The purpose of this work was to examine the dislocation substructures developed at the plastic zone of fatigue cracks which have been grown in air or in vacuum, under identical cycling conditions, in an effort to determine if the evidence obtained supported one or the other of the proposed explanations for the effect of the environment on FCG.
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