Characterization of microstructure and deformation behaviour of resistance spot welded AZ31 magnesium alloy

被引：22

作者：

Babu, N. Kishore ^{[1
]}

Brauser, S. ^{[2
]}

Rethmeier, M. ^{[2
,3
]}

Cross, C. E. ^{[4
]}

机构：

[1] Singapore Inst Mfg Technol, Singapore 638075, Singapore

[2] Fraunhofer IPK, D-10587 Berlin, Germany

[3] BAM Fed Inst Mat Res & Testing, D-12205 Berlin, Germany

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

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 549卷

关键词：

Resistance spot welding; AZ31 magnesium alloy; Microstructure; Hardness; Torsion; Tensile-shear; EXPULSION;

D O I：

10.1016/j.msea.2012.04.021

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Resistance spot welds were prepared on 3 mm thick sheets of continuous cast and rolled AZ31 magnesium alloy. The microstructure and composition analysis of weld nugget, heat affected zone (HAZ) and base metal were examined using optical and scanning electron microscopy (HR-SEM and EDS/X). The resistance spot welded magnesium alloy joints consist mainly of weld nugget and HAZ. The nugget contains two different structures, i.e. the cellular-dendritic structure at the edge of the nugget and the equiaxed dendritic structure in the centre of the nugget. The structure transition is attributed to the changes of solidification conditions. In the HAZ, grain boundary melting occurred and grain boundaries became coarse. It has been shown that hardness reduction in the weld nugget and HAZ compared with base metal is evident due to dendritic microstructure and grain growth, respectively. The results showed that spot welded joints have failed in interfacial mode under torsion and tensile-shear loading conditions. Digital image correlation during tensile-shear testing showed that low surface strains occur in the interfacial failure mode, because fracture and deformation happened primarily in the nugget area. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：149 / 156

页数：8

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