Microstructure evolution and simulation study of a duplex Mg-Li alloy during Double Change Channel Angular Pressing

被引：29

作者：

Wei, Guobing ^{[1
]}

Mahmoodkhani, Yahya ^{[2
]}

Peng, Xiaodong ^{[1
]}

Hadadzadeh, Amir ^{[2
]}

Xu, Tiancai ^{[1
]}

Liu, Junwei ^{[1
]}

Xie, Weidong ^{[1
]}

Wells, Mary A. ^{[2
]}

机构：

[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

[2] Univ Waterloo, Mech & Mechatron Engn Dept, Waterloo, ON N2L 3G1, Canada

来源：

MATERIALS & DESIGN | 2016年 / 90卷

关键词：

Mg-Li alloy; DRX; Microstructure evolution; Numerical simulation; Equal channel angular pressing; MECHANICAL-PROPERTIES; ALUMINUM-ALLOYS; ELEVATED-TEMPERATURES; DEFORMATION-BEHAVIOR; ICOSAHEDRAL PHASE; HOT EXTRUSION; ECAP; AL; COMPOSITE; FLOW;

D O I：

10.1016/j.matdes.2015.10.143

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The dual-phase Mg-9Li-3Al-2Sr-2Y alloy was extruded at 553 K using Double Change Channel Angular Pressing (DCCAP) with an extrusion ratio of 17. The commercial code DEFORM-3D was used to develop a numerical model for deformation of the investigated material and the strain distribution, damage and grain shape evolution were predicted. The accurate computation of the material flow and deformation was performed, of which the results showed good agreement with microscope observations and micro-hardness measurements on the deformed billet and extrudate. Results suggest that dynamic recrystallization (DRX) occurs during the deformation and leads to grain refinement during the DCCAP process. The tensile strength and elongation after fracture in middle part of the extrudate show optimum values of 246.6 MPa and 19.9%, respectively. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：266 / 275

页数：10

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