Article ID Journal Published Year Pages File Type
1449512 Acta Materialia 2007 6 Pages PDF
Abstract

The influence of the dissociation of dislocations when plasticity is localized in small volumes is illustrated for the case of γ/γ′ superalloys. Dissociated dislocations constrained to move through channels present three different types of behavior. Dislocation dynamic simulations in a face-centered cubic crystal show these three types of behavior and give the conditions under which a dissociated dislocation can move through a channel bordered by impenetrable obstacles. We show that a partial dislocation needs a lower stress for its motion than a perfect one in a significant domain of stress orientations. The consequences of the uncorrelated motion of one of the partials, leading to the formation of large stacking faults, are also examined.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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