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Nanoindentation and incipient plasticity

Published online by Cambridge University Press:  31 January 2011

E. B. Tadmor ,
R. Miller ,
R. Phillips  and
M. Ortiz
E. B. Tadmor
Affiliation:
Division of Engineering, Brown University, Providence, Rhode Island 02912
R. Miller
Affiliation:
Division of Engineering, Brown University, Providence, Rhode Island 02912
R. Phillips*
Affiliation:
Division of Engineering, Brown University, Providence, Rhode Island 02912
M. Ortiz
Affiliation:
Department of Aeronautics, California Institute of Technology, Pasadena, California 91125
*
c)Address all correspondence to this author. e-mail: [email protected]
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Abstract

This paper presents a large-scale atomic resolution simulation of nanoindentation into a thin aluminum film using the recently introduced quasicontinuum method. The purpose of the simulation is to study the initial stages of plastic deformation under the action of an indenter. Two different crystallographic orientations of the film and two different indenter geometries (a rectangular prism and a cylinder) are studied. We obtain both macroscopic load versus indentation depth curves, as well as microscopic quantities, such as the Peierls stress and density of geometrically necessary dislocations beneath the indenter. In addition, we obtain detailed information regarding the atomistic mechanisms responsible for the macroscopic curves. A strong dependence on geometry and orientation is observed. Two different microscopic mechanisms are observed to accommodate the applied loading: (i) nucleation and subsequent propagation into the bulk of edge dislocation dipoles and (ii) deformation twinning.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 6 , June 1999 , pp. 2233 - 2250
Copyright
Copyright © Materials Research Society 1999

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