Dislocation cross-slip in nanocrystalline fcc metals.
Constant strain rate molecular dynamics simulations of nanocrystalline Al demonstrate that a significant amount of dislocations that have nucleated at the grain boundaries, exhibit cross-slip via the Fleischer mechanism as they propagate through the grain. The grain boundary structure is found to strongly influence when and where cross-slip occurs, allowing the dislocation to avoid local stress concentrations that otherwise can act as strong pinning sites for dislocation propagation.
Bitzek
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E
Materials Science & Simulation, ASQ/NUM, Paul Scherrer Insitut, Villigen PSI, Switzerland.
Brandl
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C
Derlet
P M
PM
Van Swygenhoven
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H