Microstructural evolution of aluminum alloy during friction stir welding under different tool rotation rates and cooling conditions

doi:10.1016/j.jmst.2018.12.024

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	Microstructural evolution of aluminum alloy during friction stir welding under different tool rotation rates and cooling conditions
	Zeng, X. H.2,3; Xue, P.2; Wu, L. H.2; Ni, D. R.2; Xiao, B. L.2; Wang, K. S.1; Ma, Z. Y.2
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2019-06-01
卷号	35 期号:6 页码:972-981
关键词	Aluminum alloys Grain refinement Dynamic recrystallization Severe plastic deformation Friction stir welding
ISSN号	1005-0302
DOI	10.1016/j.jmst.2018.12.024
通讯作者	Wu, L. H.(lhwu@imr.ac.cn) ; Ma, Z. Y.(zyma@imr.ac.cn)
英文摘要	The microstructural evolution during friction stir welding (FSW) has long been studied only using onesingle welding parameter. Conclusions were usually made based on the final microstructure observationand hence were one-sided. In this study, we used the "take-action" technique to freeze the microstructure of an Al-Mg-Si alloy during FSW, and then systematically investigated the microstructures along the material flow path under different tool rotation rates and cooling conditions. A universal characteristic ofthe microstructural evolution including four stages was identified, i.e. dynamic recovery (DRV), dislocation multiplication, new grain formation and grain growth. However, the dynamic recrystallization (DRX) mechanisms in FSW depended on the welding condition. For the air cooling condition, the DRX mechanisms were related to continuous DRX associated with subgrain rotation and geometric DRX at high and low rotation rates, respectively. Under the water cooling condition, we found a new DRX mechanismassociated with the progressive lattice rotation resulting from the pinning of the second-phase particles. Based on the analyses of the influencing factors of grain refinement, it was clearly demonstrated thatthe delay of DRV and DRX was the efficient method to refine the grains during FSW. Besides, ultra-high strain rate and a short duration at high temperatures were the key factors to produce an ultrafine-grainedmaterial. (c) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
资助项目	National Natural Science Foundation of China[51331008] ; National Natural Science Foundation of China[51471171] ; National Natural Science Foundation of China[U1760201]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000464017000003
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/132695]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wu, L. H.; Ma, Z. Y.
作者单位	1.Xian Univ Architecture & Technol, Sch Met Engn, Xian 710055, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zeng, X. H.,Xue, P.,Wu, L. H.,et al. Microstructural evolution of aluminum alloy during friction stir welding under different tool rotation rates and cooling conditions[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2019,35(6):972-981.
APA	Zeng, X. H..,Xue, P..,Wu, L. H..,Ni, D. R..,Xiao, B. L..,...&Ma, Z. Y..(2019).Microstructural evolution of aluminum alloy during friction stir welding under different tool rotation rates and cooling conditions.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,35(6),972-981.
MLA	Zeng, X. H.,et al."Microstructural evolution of aluminum alloy during friction stir welding under different tool rotation rates and cooling conditions".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 35.6(2019):972-981.