Microstructure, static and fatigue properties of refill friction stir spot welded 7075-T6 aluminium alloy using a modified tool

被引：38
作者：
Shen, Z. [1 ,2 ,3 ,4 ]
Ding, Y. [4 ]
Chen, J. [5 ]
Fu, L. [1 ,2 ,3 ]
Liu, X. C. [1 ,2 ,3 ]
Chen, H. [1 ,2 ,3 ]
Guo, W. [1 ,2 ,3 ]
Gerlich, A. P. [4 ]
机构：
[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, Xian, Shaanxi, Peoples R China
[2] Northwestern Polytech Univ, Shanxi Key Lab Frict Welding Technol, Xian, Shaanxi, Peoples R China
[3] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian, Shaanxi, Peoples R China
[4] Univ Waterloo, Dept Mech & Mechatron Engn, Waterloo, ON, Canada
[5] Nat Resources Canada, CanmetMAT, Hamilton, ON, Canada
来源：
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING | 2019年 / 24卷 / 07期
基金：
加拿大自然科学与工程研究理事会;
关键词：
Refill friction stir spot welding; modified tool; 7075-T6 Al alloy; fatigue behaviour; stress concentration; CROSS-TENSION SPECIMENS; LAP-SHEAR SPECIMENS; MECHANICAL-PROPERTIES; FAILURE MECHANISMS; MATERIAL FLOW; DEFECT FEATURES; AL; BEHAVIOR; PARAMETERS; PERFORMANCE;
D O I：
10.1080/13621718.2019.1572300
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Defect-free joints were produced in 2.0mm thick 7075-T6 Al alloy by refill friction stir spot welding using a modified tool. Weld performance was evaluated in terms of microstructure, interfacial bonding, hardness, static and fatigue strength based on the experimental observations. The results indicated that grain size, interfacial bonding quality and lap shear strength significantly depend on sleeve penetration depth (SPD), with sufficient interfacial bonding and stable lap shear strength achieved when SPD >= 1.8mm. The SPD and applied load played a dominant role in determining the static lap shear and fatigue failure mechanisms, respectively. More precisely, the lap shear failure mode was an interfacial failure when SPD <= 1.8mm, and nugget pullout when SPD >= 2.0mm. The fatigue fracture mode involved nugget pullout under high applied load, while fracture through the parent sheet occurs under medium and lower applied loads.
引用
收藏
页码：587 / 600
页数：14
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