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Title: Dislocation processes and deformation twinning in nanocrystalline Al.

Abstract

Using a recently developed, massively parallel molecular-dynamics (MD) code for the simulation of polycrystal plasticity, we analyze for the case of nanocrystalline Al the complex interplay among various dislocation and grain-boundary processes during low-temperature deformation. A unique aspect of this work, arising from our ability to deform to rather large plastic strains and to consider a rather large grain size, is the observation of deformation under very high grain-boundary and dislocation densities, i.e., in a deformation regime where they compete on an equal footing. We are thus able to identify the intra- and intergranular dislocation and grain-boundary processes responsible for the extensive deformation twinning observed in our simulations. This illustrates the ability of this type of simulations to capture novel atomic-level insights into the underlying deformation mechanisms not presently possible experimentally. smaller grain size, mobile dislocations must be nucleated from other sources, such as the GBs or grain junctions.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
793905
Report Number(s):
ANL/MSD/CP-106308
TRN: US200208%%135
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: ICCN 2002, San Juan (PR), 04/22/2002--04/25/2002; Other Information: PBD: 29 Jan 2002
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; DEFORMATION; DISLOCATIONS; GRAIN SIZE; PLASTICITY; POLYCRYSTALS; TWINNING; MOLECULAR DYNAMICS METHOD; COMPUTERIZED SIMULATION

Citation Formats

Yamakov, V, Wolf, D, Phillpot, S R, and Gleiter, H. Dislocation processes and deformation twinning in nanocrystalline Al.. United States: N. p., 2002. Web.
Yamakov, V, Wolf, D, Phillpot, S R, & Gleiter, H. Dislocation processes and deformation twinning in nanocrystalline Al.. United States.
Yamakov, V, Wolf, D, Phillpot, S R, and Gleiter, H. Tue . "Dislocation processes and deformation twinning in nanocrystalline Al.". United States. https://www.osti.gov/servlets/purl/793905.
@article{osti_793905,
title = {Dislocation processes and deformation twinning in nanocrystalline Al.},
author = {Yamakov, V and Wolf, D and Phillpot, S R and Gleiter, H},
abstractNote = {Using a recently developed, massively parallel molecular-dynamics (MD) code for the simulation of polycrystal plasticity, we analyze for the case of nanocrystalline Al the complex interplay among various dislocation and grain-boundary processes during low-temperature deformation. A unique aspect of this work, arising from our ability to deform to rather large plastic strains and to consider a rather large grain size, is the observation of deformation under very high grain-boundary and dislocation densities, i.e., in a deformation regime where they compete on an equal footing. We are thus able to identify the intra- and intergranular dislocation and grain-boundary processes responsible for the extensive deformation twinning observed in our simulations. This illustrates the ability of this type of simulations to capture novel atomic-level insights into the underlying deformation mechanisms not presently possible experimentally. smaller grain size, mobile dislocations must be nucleated from other sources, such as the GBs or grain junctions.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

Conference:
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