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

IMR OpenIR

	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.
通讯作者	Ma, Z. Y.(zyma@imr.ac.cn) ; Xiao, B. L.(blxiao@imr.ac.cn)
	2019-03-01
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	166 页码:371-385
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.
关键词	Friction stir Titanium Recrystallization Deformation Finite element simulation
资助者	National Natural Science Foundation of China ; IMR SYNL-T.S. Ke Research Fellowship
DOI	10.1016/j.actamat.2018.12.059
收录类别	SCI
语种	英语
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
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000459358200033
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：77[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/321006/131992
专题	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.