Temperature and strain-rate dependence of surface dislocation nucleation.

Journal Article (Journal Article)

Dislocation nucleation is essential to the plastic deformation of small-volume crystalline solids. The free surface may act as an effective source of dislocations to initiate and sustain plastic flow, in conjunction with bulk sources. Here, we develop an atomistic modeling framework to address the probabilistic nature of surface dislocation nucleation. We show the activation volume associated with surface dislocation nucleation is characteristically in the range of 1-10b3, where b is the Burgers vector. Such small activation volume leads to sensitive temperature and strain-rate dependence of the nucleation stress, providing an upper bound to the size-strength relation in nanopillar compression experiments.

Full Text

Duke Authors

Cited Authors

  • Zhu, T; Li, J; Samanta, A; Leach, A; Gall, K

Published Date

  • January 15, 2008

Published In

Volume / Issue

  • 100 / 2

Start / End Page

  • 025502 -

PubMed ID

  • 18232884

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.100.025502


  • eng