Comparison of void strengthening in fcc and bcc metals: Large-scale atomic-level modelling

Yu N. Osetsky; D. J. Bacon

doi:10.1016/j.msea.2005.02.083

Comparison of void strengthening in fcc and bcc metals: Large-scale atomic-level modelling

Yu N. Osetsky, D. J. Bacon

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75 Scopus citations

Abstract

Strengthening due to voids can be a significant radiation effect in metals. Treatment of this by elasticity theory of dislocations is difficult when atomic structure of the obstacle and dislocation is influential. In this paper, we report results of large-scale atomic-level modelling of edge dislocation-void interaction in fcc (copper) and bcc (iron) metals. Voids of up to 5 nm diameter were studied over the temperature range from 0 to 600 K. We demonstrate that atomistic modelling is able to reveal important effects, which are beyond the continuum approach. Some arise from features of the dislocation core and crystal structure, others involve dislocation climb and temperature effects.

Original language	English
Pages (from-to)	374-377
Number of pages	4
Journal	Materials Science and Engineering: A
Volume	400-401
Issue number	1-2 SUPPL.
DOIs	https://doi.org/10.1016/j.msea.2005.02.083
State	Published - Jul 25 2005

Funding

This research was sponsored by the Division of Materials Sciences and Engineering and the Office of Fusion Energy Sciences, U.S. Department of Energy, under contract DE-AC05-00OR22725 with UT-Battelle, LLC.

Keywords

Cu
Dislocation-obstacle interactions
Fe
Molecular dynamics
Voids
Yield stress

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10.1016/j.msea.2005.02.083

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abstract = "Strengthening due to voids can be a significant radiation effect in metals. Treatment of this by elasticity theory of dislocations is difficult when atomic structure of the obstacle and dislocation is influential. In this paper, we report results of large-scale atomic-level modelling of edge dislocation-void interaction in fcc (copper) and bcc (iron) metals. Voids of up to 5 nm diameter were studied over the temperature range from 0 to 600 K. We demonstrate that atomistic modelling is able to reveal important effects, which are beyond the continuum approach. Some arise from features of the dislocation core and crystal structure, others involve dislocation climb and temperature effects.",

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AU - Bacon, D. J.

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AB - Strengthening due to voids can be a significant radiation effect in metals. Treatment of this by elasticity theory of dislocations is difficult when atomic structure of the obstacle and dislocation is influential. In this paper, we report results of large-scale atomic-level modelling of edge dislocation-void interaction in fcc (copper) and bcc (iron) metals. Voids of up to 5 nm diameter were studied over the temperature range from 0 to 600 K. We demonstrate that atomistic modelling is able to reveal important effects, which are beyond the continuum approach. Some arise from features of the dislocation core and crystal structure, others involve dislocation climb and temperature effects.

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KW - Dislocation-obstacle interactions

KW - Fe

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KW - Yield stress

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ER -

Comparison of void strengthening in fcc and bcc metals: Large-scale atomic-level modelling

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