Effects of tool rotational and welding speed on microstructure and mechanical properties of bobbin-tool friction-stir welded Mg AZ31

被引：120

作者：

Li, W. Y. ^{[1
]}

Fu, T. ^{[1
]}

Huetsch, L. ^{[2
]}

Hilgert, J. ^{[2
]}

Wang, F. F. ^{[1
]}

dos Santos, J. F. ^{[2
]}

Huber, N. ^{[3
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Shaanxi Key Lab Frict Welding Technol, Xian 710072, Shaanxi, Peoples R China

[2] Helmholtz Zentrum Geesthacht, Inst Mat Res, Solid State Joining Proc WMP, D-21502 Geesthacht, Germany

[3] Helmholtz Zentrum Geesthacht, Inst Mat Res, D-21502 Geesthacht, Germany

来源：

MATERIALS & DESIGN | 2014年 / 64卷

关键词：

Bobbin-tool friction stir welding; Magnesium alloy; Microstructure; Mechanical property; MAGNESIUM ALLOY; TENSILE PROPERTIES; JOINTS; BEHAVIOR; QUALITY;

D O I：

10.1016/j.matdes.2014.07.023

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of rotational and welding speeds on the microstructure and mechanical properties of bobbin-tool friction stir welded (BT-FSW) Mg AZ31 were investigated. The results indicated that the thermomechanically affected zone (TMAZ) consisted of equiaxed grains, which were inconsistent with the deformed, rotated and elongated grains found in the TMAZs of bobbin-tool friction stir welded Al alloys and friction stir welded Al and Mg alloys. The average grain size increased as the ratio of the rotational speed to welding speed increased. Excellent welds with no degradation in hardness were produced using a low heat input. Mechanical tests revealed that the ultimate tensile strengths gradually increased with increasing welding speed while keeping the rotational speed constant. The rotational and welding speeds had only slight influences on the yield stress and fracture elongation. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：714 / 720

页数：7

共 36 条

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