Relationship between deformation twinning and surface step formation in AZ31 magnesium alloys

被引：245

作者：

Ando, D. ^{[1
]}

Koike, J. ^{[1
]}

Sutou, Y. ^{[1
]}

机构：

[1] Tohoku Univ, Dept Mat Sci, Sendai, Miyagi 9808579, Japan

来源：

ACTA MATERIALIA | 2010年 / 58卷 / 13期

关键词：

Magnesium; Twinning; Fracture; Deformation structure; Transmission electron microscopy; CONTRACTION TWINS; FRACTURE; CRYSTALS;

D O I：

10.1016/j.actamat.2010.03.044

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Rolled sheets of AZ31 Mg alloys were deformed at room temperature under tension along the rolling direction. A number of large surface steps were observed in the region near the fractured edge. Transmission electron microscopy showed the presence of twins under these steps. Crystallographic analysis indicated that the twins are of the {1 0 (1) over bar 1}-{1 0 (1) over bar 2} double twin type with their basal planes tilted by 37 degrees with respect to the basal planes of the matrix, which is considered to make basal dislocation slip highly active within the twin. The localized deformation within the twins may lead to the formation of crack-like faults and to failure in a macroscopically brittle manner. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4316 / 4324

页数：9

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