Toughening of nanocrystalline materials through shear-coupled migration of grain boundaries

被引：19

作者：

Li, Jianjun ^{[1
]}

Soh, A. K. ^{[1
]}

机构：

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

来源：

SCRIPTA MATERIALIA | 2013年 / 69卷 / 04期

关键词：

Shear-coupled migration; Grain boundary; Nanocrystalline materials; Crack; IN-SITU; ROOM-TEMPERATURE; DEFORMATION MECHANISMS; NANOPHASE MATERIALS; MAXIMUM STRENGTH; METALS; MOTION; COPPER; BEHAVIOR; ALLOYS;

D O I：

10.1016/j.scriptamat.2013.04.014

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A theoretical model has been proposed to illustrate the effect of shear-coupled migration of grain boundaries on crack growth in deformed nanocrystalline materials. The shear-coupled migration process is initiated by the stress concentration near the tip of a mode I crack. The results obtained show that the coupled shear plays a key role in enhancing the fracture toughness of nanocrystalline materials, and the shear-coupled migration process can serve as an effective toughening mechanism in nanocrystalline materials. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：283 / 286

页数：4

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