Analysis of Microstructure and Mechanical Properties of AZ31B Magnesium Alloy/AA6061 Aluminum Alloy Welded Joint by Ultrasonic Welding

被引：0
|
作者：
Su, Zhanzhan [1 ]
Zhu, Zhengqiang [1 ]
Zhang, Yifu [1 ,2 ]
Zhang, Hua [1 ]
机构：
[1] Nanchang Univ, Sch Mech & Elect Engn, Key Lab Robot & Welding Automat Jiangxi Prov, Nanchang 330031, Jiangxi, Peoples R China
[2] Jiujiang Univ, Sch Mech & Mat Engn, Jiujiang 332005, Peoples R China
来源：
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS | 2021年 / 24卷 / 02期
基金：
中国国家自然科学基金;
关键词：
AZ31B magnesium alloy; AA6061 aluminium alloy; ultrasonic spot welding (USW); intermetallic compounds (IMCs); pop-in phenomenon; joint performance; INTERMETALLIC COMPOUNDS; MG; AL; EVOLUTION; STEEL; DEFORMATION; BEHAVIOR; SHEET;
D O I：
10.1590/1980-5373-MR-2020-0488
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
AZ31B magnesium alloy/AA6061 aluminium alloy welded structures have been widely used in the lightweight design of automobile bodies. To improve the joint strength, the ultrasonic spot welding (USW) solid state connection method is used in this paper. The results show that at a welding energy of 1540 J, there is evidence of melting in the weld joint. As the welding energy increases, the intermetallic compounds (IMCs) grow rapidly and form a reaction layer approximately 17 ?m thick. The IMCs are mainly composed of the ?-Mg17Al12+?-Mg2Al3 phase, where the ?-Mg2Al3 phase hardness is as high as 6.5 GPa and shows a typical pop-in phenomenon and the average hardness of the ?-Mg17Al12 cubic structure phase is 3.4 GPa. When the welding energy reaches 1540 J, the ? phase rapidly grows, and the joint performance decreases rapidly. The fracture morphology indicates a cleavage fracture and is accompanied by a large number of secondary cracks.
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页数：9
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