Journal
SCRIPTA MATERIALIA
Volume 65, Issue 8, Pages 660-663Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2011.06.048
Keywords
Yield strength; Nanocrystalline alloy; Molecular dynamics; Hall-Petch; Copper
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Funding
- US Department of Energy, Basic Energy Sciences [DEFG02-05ER46217]
- Deutsche Forschungsgemeinschaft [FOR714]
- Forschungszentrum Julich and HHLR at TU Darmstadt
- FZ Julich
- DAAD
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The yield strength of dilute nc-Cu alloys was investigated using molecular dynamics simulations. Alloying additions that lower grain boundary energy were found to dramatically increase the yield strength of the alloy, with dilute Cu-Nb alloys approaching the theoretical strength of Cu. These findings suggest a new scaling behavior for the onset of plasticity in nanocrystalline materials, one that depends on the product of the specific grain boundary energy and molar fraction of grain boundary atoms, and not simply on grain size alone. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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