Explanation for deviations from the Hall-Petch Relation based on the creep behavior of an ultrafine-grained Mg-Li alloy with low diffusivity

被引：23

作者：

Kim, W. J. ^{[1
]}

机构：

[1] Hongik Univ, Dept Mat Sci & Engn, Seoul 121791, South Korea

来源：

SCRIPTA MATERIALIA | 2009年 / 61卷 / 06期

关键词：

Severe plastic deformation (SPD); Magnesium alloys; Ductility; Ultrafine-grained microstructure; MECHANICAL-PROPERTIES; NANOCRYSTALLINE MATERIALS; PLASTIC-DEFORMATION; MAGNESIUM ALLOY; MICROSTRUCTURE; SOLIDS;

D O I：

10.1016/j.scriptamat.2009.06.001

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Deviation from the normal Hall-Petch relationship was observed in an ultrafine-grained Mg-Li alloy at low strain rates where plastic flow was governed by power-law creep. Based on the deformation analysis, the abnormal Hall-Petch relation for many metals often observed at nanograin sizes could be explained in terms of a transition from power-law breakdown to a grain-size-independent creep mechanism or a transition from a grain-size-independent to a grain-size-dependent mechanism, the condition of which depends greatly on strain rate and diffusivity. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：652 / 655

页数：4

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