Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 111, Issue 18, Pages 6560-6565Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1400786111
Keywords
planar fault; twinning; slip; molecular dynamics
Categories
Funding
- Steel Innovation Program of POSCO
- World Class University program through the National Research Foundation of Korea [R32-10147]
- Technology Innovation Program
- Ministry of Knowledge Economy of Korea [10041187]
- Swedish Research Council
- European Research Council
- Swedish Foundation for International Cooperation in Research and Higher Education
- Swedish Steel Producers' Association
- Hungarian Scientific Research Fund (OTKA) [OTKA 84078, 109570]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10041187] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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