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Modeling the Effects of Dislocation-Grain Boundary Interactions in Polycrystal Plasticity: Identification and Characterization of Unit Mechanisms

Published online by Cambridge University Press:  21 March 2011

M. de Koning ,
R. Miller ,
V.V. Bulatov  and
F. Abraham
M. de Koning
Affiliation:
Lawrence Livermore National Laboratory, University of California, CA 94550
R. Miller
Affiliation:
University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5A9, Canada
V.V. Bulatov
Affiliation:
Lawrence Livermore National Laboratory, University of California, CA 94550
F. Abraham
Affiliation:
IBM Research Division, Almaden Research Center, San Jose, CA 95120
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Abstract

In this paper we focus on one of the key issues in polycrystalline plasticity: the unit mechanisms involving the interactions between dislocations and grain boundaries (GB). Using a combination of large-scale molecular dynamics simulations based on an embedded atom potential and an analysis in terms of the line-tension model we identify and characterize the geometrical parameters that govern the occurrence of slip transmission, absorption, blockage, etc. in dislocation-GB interactions. The results provide a guideline for the development of quantitative micro-constitutive equations for dislocation-GB interactions to be used in meso-scale simulations of polycrystal plasticity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 677: Symposium AA – Advances in Materials Theory and Modeling–Bridging Over Multiple-Length and Time Scales , 2001 , AA1.5
Copyright
Copyright © Materials Research Society 2001

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References

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