Observation and analysis of the coexistence of two "opposite" twin modes in a Mg-Al-Zn alloy

被引：17

作者：

Guo, Changfa ^{[1
]}

Xin, Renlong ^{[1
]}

Xiao, Yue ^{[1
]}

Liu, Guodong ^{[1
]}

Liu, Qing ^{[1
]}

机构：

[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 630044, Peoples R China

来源：

MATERIALS & DESIGN | 2016年 / 102卷

基金：

中国国家自然科学基金;

关键词：

Twinning; Variant selection; Schmid factor; Strain accommodation; Mg alloys; POLYCRYSTALLINE MAGNESIUM ALLOY; VARIANT SELECTION; COMPATIBILITY FACTOR; TENSILE DEFORMATION; GRAIN-BOUNDARIES; ROOM-TEMPERATURE; BEHAVIOR; SECONDARY; DUCTILITY; SHEET;

D O I：

10.1016/j.matdes.2016.04.034

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Understanding twinning mechanism is crucial to effectively tailor twin-related properties of HCP metals. Here, we reported an uncommon twin phenomenon during rolling of tilted Mg alloy sheets: coexistence of {10-12} extension twin (ET) and {10-11} contraction twin (CT) inside the same grain. 26 such twinning grains containing 40 ETs and 33 CTs were identified via crystallographic analysis to explore the coexistence mechanism in terms of Schmid law and local strain accommodation effects. The statistical results show that the geometrical relationship between stress state during rolling and grain orientations is favorable for the activation of CTs but not for ETs. Further examination indicates that ETs are very likely to be induced by pile-up of basal slip in their respective parent grains. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：196 / 201

页数：6

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