期刊
ACTA MATERIALIA
卷 59, 期 20, 页码 7744-7756出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.09.004
关键词
Severe plastic deformation; Nanocomposite; Interface structure; Slip; Molecular dynamics
资金
- MISTI-France at MIT
- Center for Materials in Irradiation and Mechanical Extremes, an Energy Frontier Research Center
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [2008LANL1026]
- French National Research Agency (ANR) [ANR-06-MAPR-0013]
- French CNRS (accueil en delegation)
- Agence Nationale de la Recherche (ANR) [ANR-06-MAPR-0013] Funding Source: Agence Nationale de la Recherche (ANR)
Atomistic modeling is used to investigate the shear resistance and interaction with point defects of a Cu-Nb interface found in nanocomposites synthesized by severe plastic deformation. The shear resistance of this interface is highly anisotropic: in one direction shearing occurs at stresses <1200 MPa, while in the other it does not occur at all. The binding energy of vacancies, interstitials and He impurities to this interface depends sensitively on the binding location, but there is no point defect delocalization, nor does this interface contain any constitutional defects. These behaviors are markedly dissimilar from a different Cu-Nb interface found in magnetron sputtered composites. The dissimilarities may, however, be explained by quantitative differences in the detailed structure of these two interfaces. (c) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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