Effect of post weld artificial aging and water cooling on microstructure and mechanical properties of friction stir welded 2198-T8 Al-Li joints

doi:10.1016/j.jmst.2022.01.020

IMR OpenIR

	Effect of post weld artificial aging and water cooling on microstructure and mechanical properties of friction stir welded 2198-T8 Al-Li joints
	Tao, Y.; Zhang, Z.; Xue, P.; Ni, D. R.; Xiao, B. L.; Ma, Z. Y.
通讯作者	Ni, D. R.(drni@imr.ac.cn) ; Ma, Z. Y.(zyma@imr.ac.cn)
	2022-10-01
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	123 页码:92-112
摘要	Friction stir welding (FSW) under both air cooling and water cooling conditions with welding parameters of 80 0-120 0 rpm rotation rates and 50-200 mm/min welding speeds was carried out on 2198-T8 Al-Li alloys, and post weld artificial aging was performed on the air cooled joints. No welding defects other than lazy S were observed in the nugget zone (NZ) for all joints. Under air cooling condition, the lowest hardness zone (LHZ) occurred in the heat affected zone (HAZ). FSW resulted in gradual dissolution of original T 1 , theta' and delta' / beta' from the base material (BM) to the thermo-mechanically affected zone (TMAZ), and complete dissolution of all precipitates in the NZ with delta' / beta' and Guinier-Preston zones precipitating during cooling. The air cooled joints exhibited no noticeable changes in intrinsic tensile strength with a joint strength reaching 81.3% of the BM, but varied elongation with welding parameters, which was closely related to failure in the NZ and fracture along lazy S. Post weld artificial aging led to the largest hardness recovery in the TMAZ but smaller hardness recovery in the initial LHZ and the NZ. Different aging kinetics across the joint was determined by volume fraction of both original precipitate dissolution during welding and coarse particles formed during aging, and by dislocation density inherited from welding. Post weld artificial aging greatly enhanced the joint strength with the ultimate tensile strength reaching 87.3% of the BM. As compared to air cooling condition, water cooling hardly affected the NZ hardness and did not improve the joint strength, and the reason was discussed in light of precipitates, hardness changes and fracture behavior. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Friction stir welding Aluminum-lithium alloys Microstructure Mechanical properties
资助者	Excellent Youth Foundation of Liaoning Province ; Natural Science Foundation of Liaoning Province ; National Natural Science Foundation of China
DOI	10.1016/j.jmst.2022.01.020
收录类别	SCI
语种	英语
资助项目	Excellent Youth Foundation of Liaoning Province[2021-YQ-01] ; Natural Science Foundation of Liaoning Province[2021-MS-011] ; National Natural Science Foundation of China[U1760201]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000788132100001
出版者	JOURNAL MATER SCI TECHNOL
引用统计	被引频次：29[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/321006/172552
专题	中国科学院金属研究所
通讯作者	Ni, D. R.; Ma, Z. Y.
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Tao, Y.,Zhang, Z.,Xue, P.,et al. Effect of post weld artificial aging and water cooling on microstructure and mechanical properties of friction stir welded 2198-T8 Al-Li joints[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2022,123:92-112.
APA	Tao, Y.,Zhang, Z.,Xue, P.,Ni, D. R.,Xiao, B. L.,&Ma, Z. Y..(2022).Effect of post weld artificial aging and water cooling on microstructure and mechanical properties of friction stir welded 2198-T8 Al-Li joints.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,123,92-112.
MLA	Tao, Y.,et al."Effect of post weld artificial aging and water cooling on microstructure and mechanical properties of friction stir welded 2198-T8 Al-Li joints".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 123(2022):92-112.