Deformation twins in ultrafine grained commercial aluminum

被引：17

作者：

Liu, Manping ^{[1
]}

Roven, Hans J. ^{[1
]}

Yu, Yingda ^{[1
]}

机构：

[1] Norwegian Univ Sci & Technol, Dept Mat Sci & Engn, N-7491 Trondheim, Norway

来源：

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH | 2007年 / 98卷 / 03期

关键词：

deformation twinning; aluminum alloys; equal channel angular pressing; stacking faults; dislocations;

D O I：

10.3139/146.101453

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Deformation twins in an ultrafine grained commercial Al-Mg-Si alloy with nonequilibrium grain boundaries processed by equal channel angular pressing at room temperature have been observed by means of a transmission electron microscope and a high-resolution transmission electron microscope. It was found that deformation twins formed frequently at the intersections of several grain bands where the critical stress level is reached locally and a change in the dominant slip system may occur due to the significant plastic deformation. Deformation twinning was also observed to occur via partial dislocations emission from grain boundaries and grain boundary junctions in the ultrafine grained alloy. Twins and stacking faults formed by Shockley partial dislocations dissociated from 0 degrees screw dislocations were characterized and analyzed. Three twinning mechanisms suggested by molecular dynamic simulations were identified and their relevance was discussed.

引用

页码：184 / 190

页数：7

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