The strengthening mechanism of spray forming Al-Zn-Mg-Cu alloy by underwater friction stir welding

被引：70
作者：
Wang, Qingzhao [1 ]
Zhao, Zhixia [1 ]
Zhao, Yong [1 ]
Yan, Keng [1 ]
Liu, Chuan [1 ]
Zhang, Hao [2 ]
机构：
[1] Jiangsu Univ Sci & Technol, Prov Key Lab Adv Welding Technol, Zhenjiang 212003, Jiangsu, Peoples R China
[2] Jiangsu Hao Ran Spray Forming Alloy Co LTD, Zhenjiang 212003, Jiangsu, Peoples R China
来源：
MATERIALS & DESIGN | 2016年 / 102卷
基金：
中国国家自然科学基金;
关键词：
Spray forming; Water cooling method; Friction stir welding; Microstructure; Strengthening mechanism; 7055; ALUMINUM-ALLOY; MICROSTRUCTURE; PRECIPITATION; JOINTS;
D O I：
10.1016/j.matdes.2016.04.036
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Spray forming Al-Zn-Mg-Cu alloy has beenwelded successfully by underwater Friction Stir Welding (underwater FSW). The joint is defect-free with tensile strength of 406.06 MPa and improved elongation (1.96%). Microstructure of underwater joint has been improved in which the hard-etched area is eliminated compared with traditional joint. The microstructure of joints was observed by OM and SEM. EDS, DSC, XRD and TEM were applied to do further study on the evolution of strengthening phases. The results show that water cooling method has improved the thermal cycle of welding. The microstructure of joint and the strengthening mechanism of underwater joint had a close relationship with the effect of water cooling method. The system analysis of underwater FSW process has been illustrated. Water cooling method creates rapid cooling process to introduce GPII zone and reserve a large amount of needle-like semi-coherent structure MgZn2 which is {0001}(eta(eta')) parallel to{111}(Al) dispersing in the matrix. The strength of joint has been enhanced by coherency strengthening. (C) 2016 Elsevier Ltd. All rights reserved.
引用
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页码：91 / 99
页数：9
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