Effect of grain size on the competition between twinning and detwinning in nanocrystalline metals

被引：67

作者：

Ni, S. ^{[1
]}

Wang, Y. B. ^{[1
]}

Liao, X. Z. ^{[1
]}

Li, H. Q. ^{[2
]}

Figueiredo, R. B. ^{[3
]}

Ringer, S. P. ^{[1
]}

Langdon, T. G. ^{[4
,5
]}

Zhu, Y. T. ^{[6
]}

机构：

[1] Univ Sydney, Sydney, NSW 2006, Australia

[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[3] Univ Fed Minas Gerais, BR-31270901 Belo Horizonte, MG, Brazil

[4] Univ Southampton, Southampton SO17 1BJ, Hants, England

[5] Univ So Calif, Los Angeles, CA 90089 USA

[6] N Carolina State Univ, Raleigh, NC 27695 USA

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 23期

基金：

澳大利亚研究理事会; 美国国家科学基金会;

关键词：

MOLECULAR-DYNAMICS SIMULATION; CENTERED-CUBIC METALS; DEFORMATION TWINS; ROOM-TEMPERATURE; FCC METALS; AL; DISLOCATION; GROWTH; COPPER; ALUMINUM;

D O I：

10.1103/PhysRevB.84.235401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Both twinning and detwinning have been reported to occur during the deformation of nanocrystalline (nc) face-centered-cubic metals. This raises the issue of how these two processes compete with each other. Here, we report that the twinning process dominates in a certain range of grain sizes, whereas, the detwinning process dominates outside of this range to annihilate all twins. These experimental observations establish a full spectrum of grain-size effects on deformation twinning and detwinning and are explained by the deformation physics. They also provide a fundamental basis for understanding and designing the mechanical behavior of nc metals and alloys.

引用

页数：4

共 29 条

[1] Deformation twinning in nanocrystalline aluminum [J].