Size effect on the strength of micron-sized polycrystals - A dislocation dynamics simulation study

SCRIPTA MATERIALIA

卷:69

Article

Leung, P. S. S.¹  Ngan, A. H. W.¹ 

[1] Univ Hong Kong, Dept Mech Engn, Hong Kong, Hong Kong, Peoples R China

关键词: Polycrystalline;    Simulation;    Dislocations;    Plastic deformation;   

DOI  :  10.1016/j.scriptamat.2013.04.006

来源: Elsevier

【 摘 要 】

The effects of grain size (d), specimen size (t) and initial dislocation density on the strength of micron-sized polycrystals are simulated by two-dimensional dislocation dynamics. The results show that the continuum phenomenon of smaller being weaker effect for 1 < t/d (sic) 3 occurs only when the initial dislocation density is high. When t/d < 1 with high initial dislocation density, or when the initial dislocation density is low regardless of t/d, the opposite smaller being stronger effect occurs. (c) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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