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Dislocation nucleation during nanoindentation of aluminum

Published

Author(s)

Richard J. Wagner, Li Ma, Francesca M. Tavazza, Lyle E. Levine

Abstract

Through multiscale simulations, we explore the influence of an atomically-rough indenter tip on the nucleation of dislocations during nanoindentation of single-crystal aluminum.  We model the long-range strain with finite element analysis using anisotropic linear elasticity.  We then atomize a region near the indenter and perform molecular dynamics with an embedded atom method interatomic potential.  Smooth indenters nucleate dislocations below the surface but rough indenters can nucleate dislocations at both the surface and the interior.  Increasing temperature from 0 K to 300 K creates prenucleation defects in the region of high stress and decreases the critical depth.
Citation
Journal of Applied Physics
Volume
104
Issue
11

Keywords

dislocation nucleation, multiscale modeling, nanoindentation

Citation

Wagner, R. , Ma, L. , Tavazza, F. and Levine, L. (2008), Dislocation nucleation during nanoindentation of aluminum, Journal of Applied Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=853591 (Accessed June 13, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created December 8, 2008, Updated February 17, 2017