Microstructure Evolution during Dissimilar Friction Stir Welding of AA7003-T4 and AA6060-T4

被引：25

作者：

Dong, Jialiang ^{[1
]}

Zhang, Datong ^{[1
]}

Zhang, Weiwen ^{[1
]}

Zhang, Wen ^{[1
]}

Qiu, Cheng ^{[1
]}

机构：

[1] South China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Metall M, Guangzhou 510640, Guangdong, Peoples R China

来源：

MATERIALS | 2018年 / 11卷 / 03期

基金：

高等学校博士学科点专项科研基金;

关键词：

dissimilar friction stir welding; mechanical properties; microstructure evolution; dynamic recrystallization; MG-SI ALLOYS; ALUMINUM-ALLOYS; MECHANICAL-PROPERTIES; HEAT-TREATMENT; WELDED-JOINTS; CU ALLOY; PRECIPITATION; PARAMETERS; AA7075; T4;

D O I：

10.3390/ma11030342

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this work, the dissimilar joint of AA7003-T4 and 6060-T4 alloy has been produced by friction stir welding (FSW). The microstructure was examined by optical microscope (OM), electron back scattered diffraction (EBSD), transmission electron microscopy (TEM), and the mechanical properties of the joint were investigated. It is demonstrated that sound dissimilar joint can be produced through FSW. In the nugget; precipitations dissolve into the matrix and eta' reprecipitate subsequently; and the elongated aluminum grains are replaced by fine and equiaxed grains due to dynamic recrystallization (DRX). In the heat affected zone (HAZ), coarse beta' and eta precipitates are formed and the aluminum grains are coarser as compared to the base materials. In the thermo-mechanical affected zone (TMAZ), equiaxed and elongated grains coexist due to incomplete DRX. The ultimate tensile strength of the dissimilar joint is 159.2 MPa and its elongation is 10.4%. The weak area exists in the HAZ of 6060 alloy, which is placed in the retreating side during FSW. The correlations between the microstucture and mechanical properties of the dissimilar joint are discussed.

引用

页数：12

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