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The effect of grain size diversity on the flow stress of nanocrystalline metals by finite-element modelling

Authors
Journal
Scripta Materialia
1359-6462
Publisher
Elsevier
Volume
67
Issue
4
Identifiers
DOI: 10.1016/j.scriptamat.2012.05.043
Keywords
  • Nanocrystalline Materials
  • Mechanical Properties
  • Finite-Element Analysis
  • Grain Size Diversity

Abstract

The results of finite-element modelling of the effect of grain size uniformity on the flow stress of nanocrystalline metals are reported. The results gave a clear evidence of grain size effect and the reverse Hall–Petch relationship, which is a consequence of macroscopic strain being preferentially accumulated at grain boundaries. They also show the importance of grain size distribution on the flow stress of polycrystals. In fact, K values for the polycrystalline aggregate decrease with increasing grain size diversity.

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