期刊
ACTA MATERIALIA
卷 59, 期 8, 页码 2957-2968出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.01.036
关键词
Nanocrystalline materials; Grain boundary structure; Grain boundary segregation; Plastic deformation; Molecular dynamics
资金
- Deutsche Forschungsgemeinschaft [FOR714]
Plastic deformation of nanocrystalline Pd-Au is studied by means of atomic-scale computer simulations. The distribution of solutes is equilibrated in model structures of different grain sizes and compositions using a combination of Monte Carlo and molecular dynamics methods. The resulting samples are deformed under uniaxial load. The role of grain boundary solute segregation is analyzed in detail by comparing chemically and structurally relaxed samples with model structures that were only structurally relaxed or reloaded. By analyzing dislocation activity, site occupancy, atomic free volume in the grain boundaries, stacking and twin fault densities, we make a connection between composition-dependent properties of the miscible alloy and the observed stress strain behavior. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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