Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1449512 | Acta Materialia | 2007 | 6 Pages |
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.