Theory for plasticity of face-centered cubic metals

The activation of plastic deformation mechanisms determines the mechanical behavior of crystalline materials. However, the complexity of plastic deformation and the lack of a unified theory of plasticity have seriously limited the exploration of the full capacity of metals. Current efforts to design...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 111; no. 18; pp. 6560 - 6565
Main Authors Jo, Minho, Mo Koo, Yang, Lee, Byeong-Joo, Johansson, Börje, Vitos, Levente, Se Kyun Kwon
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 06.05.2014
National Acad Sciences
Subjects
Crystal twinning
Deformation
Design criteria
energy
Fees
Materials
mechanical properties
Metals
Microscopic analysis
molecular dynamics
Phenomenology
Physical properties
Physical Sciences
planar fault
Plastic deformation
Plasticity
Plastics
slip
Stacking fault energy
Stacking faults
Steels
texture
Theory
Trajectories
twinning
twinning
planar fault
molecular dynamics
slip
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Summary:The activation of plastic deformation mechanisms determines the mechanical behavior of crystalline materials. However, the complexity of plastic deformation and the lack of a unified theory of plasticity have seriously limited the exploration of the full capacity of metals. Current efforts to design high-strength structural materials in terms of stacking fault energy have not significantly reduced the laborious trial and error works on basic deformation properties. To remedy this situation, here we put forward a comprehensive and transparent theory for plastic deformation of face-centered cubic metals. This is based on a microscopic analysis that, without ambiguity, reveals the various deformation phenomena and elucidates the physical fundaments of the currently used phenomenological correlations. We identify an easily accessible single parameter derived from the intrinsic energy barriers, which fully specifies the potential diversity of metals. Based entirely on this parameter, a simple deformation mode diagram is shown to delineate a series of convenient design criteria, which clarifies a wide area of material functionality by texture control.
Bibliography:http://dx.doi.org/10.1073/pnas.1400786111
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Edited* by Ho-kwang Mao, Carnegie Institution of Washington, Washington, DC, and approved April 2, 2014 (received for review January 15, 2014)
Author contributions: M.J., Y.M.K., and S.K.K. designed research; M.J. and S.K.K. performed research; M.J., B.-J.L., and S.K.K. contributed new reagents/analytic tools; M.J., Y.M.K., B.J., L.V., and S.K.K. analyzed data; and M.J., L.V., and S.K.K. wrote the paper.
ISSN:0027-8424
1091-6490
1091-6490
DOI:10.1073/pnas.1400786111