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Author Roundy, D. ♦ Cohen, M. L. ♦ Krenn, C. R. ♦ Morris, J. W. (Jr.)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ ALUMINIUM ♦ COPPER ♦ SHEAR PROPERTIES ♦ PLASTICITY ♦ TEMPERATURE ZERO K ♦ CRYSTAL STRUCTURE ♦ RELAXATION ♦ STRAINS ♦ FCC LATTICES
Abstract The ideal shear strength is the minimum stress needed to plastically deform an infinite dislocation-free crystal and is an upper bound to the strength of a real crystal. We calculate the ideal shear strengths of Al and Cu at zero temperature using pseudopotential density functional theory within the local density approximation. These calculations allow for structural relaxation of all five strain components other than the imposed shear strain and result in strengths on {l_brace}111{r_brace} planes of 1.85 and 2.65 GPa for Al and Cu, respectively (8{percent} {endash}9{percent} of the shear moduli). In both Al and Cu, the structural relaxations reduce the ideal shear strengths by 35{percent} to 45{percent} , but the directions of relaxation strain in each are qualitatively different. {copyright} {ital 1999} {ital The American Physical Society}
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-03-01
Publisher Department Lawrence Berkeley National Laboratory
Publisher Place United States
Journal Physical Review Letters
Volume Number 82
Issue Number 13
Organization Lawrence Berkeley National Laboratory


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