Phys. Rev. Lett. 100, 235501 (2008) [4 pages]Dislocation Cross-Slip in Nanocrystalline fcc MetalsReceived 21 February 2008; published 11 June 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.235501
DOI:
10.1103/PhysRevLett.100.235501
PACS:
62.25.−g, 47.11.Mn, 61.72.Lk
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