Fabrication of high-quality Ti joint with ultrafine grains using submerged friction stirring technology and its microstructural evolution mechanism

doi:10.1016/j.actamat.2018.12.059

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	Fabrication of high-quality Ti joint with ultrafine grains using submerged friction stirring technology and its microstructural evolution mechanism
	Wu, L. H.; Hu, X. B.; Zhang, X. X.; Li, Y. Z.; Ma, Z. Y.; Ma, X. L.; Xiao, B. L.
刊名	ACTA MATERIALIA
	2019-03-01
卷号	166 页码:371-385
关键词	Friction stir Titanium Recrystallization Deformation Finite element simulation
ISSN号	1359-6454
DOI	10.1016/j.actamat.2018.12.059
通讯作者	Ma, Z. Y.(zyma@imr.ac.cn) ; Xiao, B. L.(blxiao@imr.ac.cn)
英文摘要	It is rather challenging to obtain high-quality Ti joints by conventional friction stir welding because of the problem of over-heating. The welding process and final microstructures and properties of the joints are controlled by both plastic deformation and recrystallization. However, for a long time, studies have only focused on recrystallization mechanisms but ignored deformation modes. In this study, a defect-free ultrafine-grained Ti joint with a joint efficiency of 100% was for the first time produced by submerged friction stirring (SFS) technology. We utilized transmission electron microscopy with a two-beam diffraction technique and electron backscatter diffraction to systematically investigate the deformation mode versus the grain refinement mechanism. The finite element method was utilized to simulate the temperature field throughout the joint for the microstructural explanation. During the whole SFS, prismatic slip occurred, and the other dominant deformation mechanisms changed from (10 (1) over bar2) twinning and basal slip to pyramidal slip. The variation of slip modes was largely dependent on the twinning and temperature rise. The ultrafine-grained microstructure was attributed to the successive refinement effect of the twin-dislocation interaction, dislocation absorption, dynamic grain boundary migration and texture-induced grain convergence. The effect of the temperature, strain and strain rate on the microstructural evolution mechanisms was discussed. Based on our work, we expect the wide application of SFS in producing ultrafine-grained bulk Ti materials and high-quality joints. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
资助项目	National Natural Science Foundation of China[51601194] ; National Natural Science Foundation of China[51471171] ; National Natural Science Foundation of China[51331008] ; IMR SYNL-T.S. Ke Research Fellowship
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000459358200033
资助机构	National Natural Science Foundation of China ; IMR SYNL-T.S. Ke Research Fellowship
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/131991]
专题	金属研究所_中国科学院金属研究所
通讯作者	Ma, Z. Y.; Xiao, B. L.
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Wu, L. H.,Hu, X. B.,Zhang, X. X.,et al. Fabrication of high-quality Ti joint with ultrafine grains using submerged friction stirring technology and its microstructural evolution mechanism[J]. ACTA MATERIALIA,2019,166:371-385.
APA	Wu, L. H..,Hu, X. B..,Zhang, X. X..,Li, Y. Z..,Ma, Z. Y..,...&Xiao, B. L..(2019).Fabrication of high-quality Ti joint with ultrafine grains using submerged friction stirring technology and its microstructural evolution mechanism.ACTA MATERIALIA,166,371-385.
MLA	Wu, L. H.,et al."Fabrication of high-quality Ti joint with ultrafine grains using submerged friction stirring technology and its microstructural evolution mechanism".ACTA MATERIALIA 166(2019):371-385.