Microstructure and mechanical properties of Mg-to-Al dissimilar welded joints with an Ag interlayer using ultrasonic spot welding

H.Peng; D.L.Chen; X.F.Bai; P.Q.Wang; D.Y.Li; X.Q.Jiang

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Microstructure and mechanical properties of Mg-to-Al dissimilar welded joints with an Ag interlayer using ultrasonic spot welding

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Lightweight ZEK100-0 Mg alloy and A16022-T43 Al alloy with an Ag interlayer were joined via ultrasonic spot welding(USW),focusing on the microstructural change and tensile lap shear strength of the welded joints in relation to welding energy.Mg/Al interface was superseded by Mg/Ag and Al/Ag interfaces,and unfavorable Mg门A-intermetallic compound was eliminated.Ag foil was observed to be intact in the nugget center,while it was broken or dissolved at the nugget edge at high welding energy levels.The diffusion layer at the Mg/Ag interface consisted of two distinctive sub-layers:Mg3Ag intermetallic compound adjoining Ag foil,and Mg3Ag-l-Mg eutectic structure adjacent to Mg.Only a thin diffusion layer consisting mainly of Ag3Al occurred al lhe Al/Ag interface.The tensile lap shear strength first increased,reached its peak value,and then decreased with increasing welding energy.The shear strength achieved in the present study was〜31%higher than that of the joint without interlayer.Interfacial failure occurred at all energy levels,with Ag foil particles or fragments being stuck on both Mg and Al sides due to its intense interaction with Mg and Al via accelerated diffusion during USW.The results obtained pave the way for the challenging dissimilar welding between Mg and Al alloys.

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《镁合金学报（英文）》 |2020年第2期|P.552-563|共12页
作者
H.Peng; D.L.Chen; X.F.Bai; P.Q.Wang; D.Y.Li; X.Q.Jiang;
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作者单位

College of Engineering and Technology Southwest University Tiansheng Road 2 Beibei District Chongqing 400715 ChinaDepartment of Mechanical and Industrial Engineering Ryerson University 350 Victoria Street Toronto Ontario M5B 2K3 Canada;

Department of Mechanical and Industrial Engineering Ryerson University 350 Victoria Street Toronto Ontario M5B 2K3 Canada;

College of Engineering and Technology Southwest University Tiansheng Road 2 Beibei District Chongqing 400715 China;

College of Engineering and Technology Southwest University Tiansheng Road 2 Beibei District Chongqing 400715 China;

Department of Chemical and Materials Engineering University of Alberta Edmonton Alberta T6G 1H9 Canada;

School of Materials and Energy Southwest University Tiansheng Road 2 Beibei District Chongqing 400715 China;

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原文格式 PDF
正文语种 chi
中图分类金属学与热处理;
关键词
Magnesium alloy; Aluminum alloy; Ultrasonic spot welding; Ag interlayer; Microstructure; Tensile lap shear strength;

机译：镁合金;铝合金;超声点焊;银中间层;显微组织;拉伸搭接剪切强度;

Microstructure and mechanical properties of Mg-to-Al dissimilar welded joints with an Ag interlayer using ultrasonic spot welding

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