An alternative physical explanation of the Hall-Petch relation

被引：161

作者：

Bata, V

Pereloma, EV

机构：

[1] Monash Univ Clayton, Sch Phys & Mat Engn, Melbourne, Vic 3800, Australia

[2] Monash Univ Clayton, Sch Phys & Mat Engn, Melbourne, Vic 3800, Australia

来源：

ACTA MATERIALIA | 2004年 / 52卷 / 03期

基金：

澳大利亚研究理事会;

关键词：

Hall-Petch relation; grain boundary energy; grain boundary segregation; ultrafine grained microstructure; modelling;

D O I：

10.1016/j.actamat.2003.10.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new physical model to explain the Hall-Petch relation is proposed. The main assumption is that the Hall-Petch slope (k(y)), is proportional to the work required to eject dislocations from grain boundaries. The model predicts a traditional Hall-Petch relation down to a grain size of about 5 mum, below which a deviation from linearity is observed. The strengthening peaks in the vicinity of 30 nm, and further grain refinement leads to softening. A semi-empirical equation is developed, which takes into account the effects of grain boundary strain energy. The model is applicable to both equiaxed and non-equiaxed grain structures. (C) 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：657 / 665

页数：9

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