Departmental Papers (MSE)

Document Type

Journal Article

Date of this Version

May 2008

Abstract

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.

Comments

Reprinted from Physical Review Letters, Volume 100, Article 025502, January 2008, 5 pages.
Publisher URL: 10.1103/PhysRevLett.100.025502

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Date Posted: 06 May 2008

This document has been peer reviewed.