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Theory for plasticity of face-centered cubic metals
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
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2014 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 111, no 18, 6560-6565 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2014. Vol. 111, no 18, 6560-6565 p.
Keyword [en]
planar fault, twinning, slip, molecular dynamics
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-146140DOI: 10.1073/pnas.1400786111ISI: 000335477300027ScopusID: 2-s2.0-84899800892OAI: diva2:723072
Swedish Research CouncilEU, European Research Council

QC 20140610

Available from: 2014-06-10 Created: 2014-06-09 Last updated: 2014-06-10Bibliographically approved

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Johansson, BörjeVitos, Levente
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