Dislocation-twin interactions in nanocrystalline fcc metals

被引：315
|
作者：
Zhu, Y. T. [1 ]
Wu, X. L. [2 ]
Liao, X. Z. [3 ]
Narayan, J. [1 ]
Kecskes, L. J. [4 ]
Mathaudhu, S. N. [4 ]
机构：
[1] N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA
[2] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
[3] Univ Sydney, Sch Aerosp Mech & Mech Engn, Sydney, NSW 2006, Australia
[4] USA, Res Lab, Aberdeen Proving Ground, MD 21005 USA
来源：
ACTA MATERIALIA | 2011年 / 59卷 / 02期
关键词：
Nanocrystalline materials; Dislocations; Twin boundaries; Interactions; fcc; CENTERED-CUBIC METALS; MOLECULAR-DYNAMICS SIMULATION; FIVEFOLD DEFORMATION TWINS; STRAIN-RATE SENSITIVITY; STACKING-FAULT ENERGY; FORMATION MECHANISM; NANOTWINNED COPPER; NANOSCALE TWINS; GRAINED COPPER; RE ALLOY;
D O I：
10.1016/j.actamat.2010.10.028
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Dislocation interaction with and accumulation at twin boundaries have been reported to significantly improve the strength and ductility of nanostructured face-centered cubic (fcc) metals and alloys. Here we systematically describe plausible dislocation interactions at twin boundaries. Depending on the characteristics of the dislocations and the driving stress, possible dislocation reactions at twin boundaries include cross-slip into the twinning plane to cause twin growth or de-twinning, formation of a sessile stair-rod dislocation at the twin boundary, and transmission across the twin boundary. The energy barriers for these dislocation reactions are described and compared. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：812 / 821
页数：10
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