Twinning partial multiplication at grain boundary in nanocrystalline fcc metals

被引：124

作者：

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

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

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

Narayan, J. ^{[1
]}

Mathaudhu, S. N. ^{[2
]}

Kecskes, L. J. ^{[2
]}

机构：

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

[2] USA, Res Lab, Aberdeen Proving Ground, MD 21005 USA

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

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

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 03期

关键词：

deformation; dislocations; grain growth; grain size; nanostructured materials; twin boundaries; MOLECULAR-DYNAMICS SIMULATION; FORMATION MECHANISM; DEFORMATION-MECHANISM; AL; TWINS; ALUMINUM; COPPER; SLIP;

D O I：

10.1063/1.3187539

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Most deformation twins in nanocrystalline face-centered cubic (fcc) metals have been observed to form from grain boundaries. The growth of such twins requires the emission of Shockley partials from the grain boundary on successive slip planes. However, it is statistically improbable for a partial to exist on every slip plane. Here we propose a dislocation reaction and cross-slip mechanism on the grain boundary that would supply a partial on every successive slip plane for twin growth. This mechanism can also produce a twin with macrostrain smaller than that caused by a conventional twin.

引用

页数：3

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