Formation of single and multiple deformation twins in nanocrystalline fcc metals

被引：188

作者：

Zhu, Y. T. ^{[1
]}

Narayan, J. ^{[1
]}

Hirth, J. P. ^{[2
]}

Mahajan, S. ^{[3
]}

Wu, X. L. ^{[4
]}

Liao, X. Z. ^{[3
,5
]}

机构：

[1] N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA

[2] Washington State Univ, RTD, Sch Mech & Mat Engn, Pullman, WA 99164 USA

[3] Arizona State Univ, Sch Mat, Tempe, AZ 85287 USA

[4] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China

[5] Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Sydney, NSW 2006, Australia

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 13期

关键词：

Nanocrystalline materials; Dislocations; Twin boundaries; Twinning; Interfaces; FORMATION MECHANISM; REBOUND MECHANISM; DISLOCATION; AL; SIMULATION; COPPER; ONSET; LAYER;

D O I：

10.1016/j.actamat.2009.04.020

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Deformation twins are often observed to meet each other to form multi-fold twins in nanostructured face-centered cubic (fcc) metals. Here we propose two types of mechanism for the nucleation and growth of four different single and multiple twins. These mechanisms provide continuous generation of twinning partials for the growth of the twins after nucleation. A relatively high stress or high strain rate is needed to activate these mechanisms, making them more prevalent in nanocrystalline materials than in their coarse-grained counter-parts Experimental observations that support the proposed mechanisms are presented. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3763 / 3770

页数：8

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