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Nanoindentation and incipient plasticity

Tadmor, E.B. and Miller, R. and Phillips, R. and Ortiz, M. (1999) Nanoindentation and incipient plasticity. Journal of Materials Research, 14 (6). pp. 2233-2250. ISSN 0884-2914. http://resolver.caltech.edu/CaltechAUTHORS:TADjmr99

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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 was 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) were studied. We obtained 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.


Item Type:Article
Additional Information:© 1995-2006, Materials Research Society. Received 19 August 1998; accepted 1 March 1999. We are grateful to Bernard Budianski, Gilles Canova, Marc Fivel, Bill Gerberich, Ladislas Kubin, Erica Lilleodden, David Rodney, and Vijay Shenoy for many stimulating discussions. In addition, we gratefully acknowledge support by the AFOSR through Grant F49620-95-I-0264, the NSF through Grants CMS-9414648 and DMR-9632524, and the MRSEC program at Brown University.
Subject Keywords:THIN-FILMS; DISLOCATION NUCLEATION; MOLECULAR-DYNAMICS; CONTINUUM MODELS; INDENTATION; DEFORMATION; METALS; SOLIDS; SIMULATION; MICROSCOPY
Record Number:CaltechAUTHORS:TADjmr99
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:TADjmr99
Alternative URL:http://www.mrs.org/s_mrs/sec_subscribe.asp?CID=2298&DID=79797&action=detail
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5010
Collection:CaltechAUTHORS
Deposited By: Lindsay Cleary
Deposited On:19 Sep 2006
Last Modified:26 Dec 2012 09:03

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