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Unit Shearing Events in Plasticity of Amorphous Silicon

Published online by Cambridge University Press:  26 February 2011

Michael J. Demkowicz  and
Ali S. Argon
Michael J. Demkowicz
Affiliation:
[email protected], MST-8: Structure-Property Relations, LANL, Bikini Atoll Rd., SM30, Mail Stop G755, Los Alamos, NM, 87545, United States, 505-667-0931, 505-667-8021
Ali S. Argon
Affiliation:
[email protected], MIT, Mechanical Engineering, United States
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Abstract

Plasticity in amorphous silicon (a-Si) as modeled by the Stillinger-Weber (SW) potential was investigated using structure relaxation by potential energy minimization. Irreversible stress drops in the observed mechanical response are the source of plastic deformation in this model directionally bonded material. Every such stress drop was found to be accompanied by atomic rearrangements that give evidence of the existence of unit inelastic shearing events that are characteristic of a-Si and account for plasticity in this material.

Keywords

amorphousSisimulation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 904: Symposium BB – Mechanisms of Mechanical Deformation in Brittle Materials , 2005 , 0904-BB03-07
Copyright
Copyright © Materials Research Society 2006

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