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Atomistic Simulations of the Motion of an Edge Dislocation in Aluminum Using the Embedded Atom Method

Bhate, N. and Clifton, R. J. and Phillips, R. (2002) Atomistic Simulations of the Motion of an Edge Dislocation in Aluminum Using the Embedded Atom Method. In: Shock Compression of Condensed Matter 2001. AIP Conference Proceedings. No.620. American Institute of Physics , Melville, N.Y. , pp. 339-342. ISBN 0-7354-0068-7 http://resolver.caltech.edu/CaltechAUTHORS:20111102-074723462

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Abstract

The motion of an edge dislocation is analyzed for temperatures ranging from 10 K to 200 K and for stresses up to 5 GPa. The dislocation velocity versus the applied shear stress curve can be divided into four regimes corresponding to successively higher shear stresses. In the first regime, the applied shear stress is below the Peierls stress and the dislocation velocity is nominally zero. In the second regime, the dislocation velocity decreases with increasing temperature indicating the presence of a drag due to thermal phonons. In the third regime, the dislocation reaches a sub-sonic limiting velocity that can be predicted by a two-dimensional lattice-dynamics analysis. Such an analysis predicts a limiting velocity for a moving defect when the phase velocity and the group velocity are equal. If even higher shear stresses are applied, the dislocation travels with a transonic velocity of √2 times the shear wave speed.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.1483548 DOIUNSPECIFIED
http://link.aip.org/link/?APCPCS/620/339/1PublisherUNSPECIFIED
Additional Information:© 2002 American Institute of Physics. Issue Date: 8 July 2002. The authors gratefully acknowledge the support of the NSF-MRSEC at Brown University.
Funders:
Funding AgencyGrant Number
NFS-MRSEC at Brown UniversityUNSPECIFIED
Subject Keywords:edge dislocations, dislocation motion, high-pressure effects, aluminium, stress effects
Classification Code:PACS: 61.72.Lk; 81.05.Bx; 62.50.+p
Record Number:CaltechAUTHORS:20111102-074723462
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20111102-074723462
Official Citation:Atomistic Simulations of the Motion of an Edge Dislocation in Aluminum Using the Embedded Atom Method N. Bhate, R. J. Clifton, and R. Phillips, AIP Conf. Proc. 620, 339 (2002), DOI:10.1063/1.1483548
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27570
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:02 Nov 2011 15:03
Last Modified:26 Dec 2012 14:21

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