Pinless Friction Stir Spot Welding of Mg-3Al-1Zn Alloy with Zn Interlayer

IMR OpenIR

	Pinless Friction Stir Spot Welding of Mg-3Al-1Zn Alloy with Zn Interlayer
	Xu, R. Z.; Ni, D. R.; Yang, Q.; Liu, C. Z.; Ma, Z. Y.; zyma@imr.ac.cn
	2016
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	32 期号:1 页码:76-88
摘要	With the addition of a thin Zn interlayer, 2.4 mm thick Mg-3Al-1Zn alloy sheets were friction stir spot welded (FSSW) using a pinless tool with flat, convex and concave shoulder shapes. The results showed that an alloying reaction took place between the Mg substrate and Zn interlayer during FSSW, forming a discontinuous intermetallics layer composed of dispersive (alpha-Mg + MgZn) eutectic structure underneath the shoulder and a Mg. Zn intermetallics bonding zone at the outside of the joints. This alloying reaction increased the bonded area and eliminated the hook defects, thereby producing sound FSSW joints with a shallow keyhole without hook defects. The increase of plunge depth was beneficial to the Mg. Zn diffusion, thereby increasing the tensile-shear load of the joints. However, excessive plunge depths resulted in a decrease of the effective sheet thickness, reducing the strength of the joints. At a small plunge depth, the convex and concave shoulders were more beneficial to the interface reaction than the flat shoulder. The maximum joint load of 6.6 kN was achieved by using the concave shoulder at a plunge depth of 1.0 mm. A post-welding heat treatment promoted the dissolution of the discontinuous reaction layer in the joints; however, it led to the occurrence of void defects, influencing the bonding strength. Copyright (C) 2015, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited. All rights reserved.
部门归属	[xu, r. z. ; liu, c. z.] shenyang aerosp univ, coll mat sci & engn, shenyang 110136, peoples r china ; [xu, r. z. ; ni, d. r. ; yang, q. ; ma, z. y.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
关键词	Friction Stir Spot Welding Magnesium Alloys Zn Interlayer Hook Defects
资助者	National R&D Program of China [2011BAE22B05]; Liaoning Province Doctor Startup Fund Program [20131087]; National Natural Science Foundation of China [51371179, 51331008]
收录类别	sci
语种	英语
WOS记录号	WOS:000368560500012
引用统计	被引频次：53[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/75057
专题	中国科学院金属研究所
通讯作者	zyma@imr.ac.cn
推荐引用方式 GB/T 7714	Xu, R. Z.,Ni, D. R.,Yang, Q.,et al. Pinless Friction Stir Spot Welding of Mg-3Al-1Zn Alloy with Zn Interlayer[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2016,32(1):76-88.
APA	Xu, R. Z.,Ni, D. R.,Yang, Q.,Liu, C. Z.,Ma, Z. Y.,&zyma@imr.ac.cn.(2016).Pinless Friction Stir Spot Welding of Mg-3Al-1Zn Alloy with Zn Interlayer.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,32(1),76-88.
MLA	Xu, R. Z.,et al."Pinless Friction Stir Spot Welding of Mg-3Al-1Zn Alloy with Zn Interlayer".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 32.1(2016):76-88.