Static spheroidization and its effect on superplasticity of fine lamellae in nugget of a friction stir welded Ti-6Al-4V joint

doi:10.1016/j.jmst.2021.10.054

IMR OpenIR

	Static spheroidization and its effect on superplasticity of fine lamellae in nugget of a friction stir welded Ti-6Al-4V joint
	Jia, C. L.1,2; Wu, L. H.1,3; Xue, P.1,3; Zhang, H.1,3; Ni, D. R.1; Xiao, B. L.1; Ma, Z. Y.1
通讯作者	Wu, L. H.(lhwu@imr.ac.cn)
	2022-08-20
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	119 页码:1-10
摘要	The spheroidization of the lamellar structure can greatly contribute to the superplasticity of the nugget zone (NZ) of Ti alloy welds, which is the key to achieve the integral superplastic forming of welds for the fabrication of large-scale complex components. However, the spheroidization process is complex and costly since it cannot be obtained generally, unless the lamellae suffers from a large deformation. In this study, the static spheroidization was achieved for the fine lamellae structure in the nugget of a friction stir welded (FSW) Ti-6Al-4V joint, particularly by the annealing without any deformation. The special alpha/beta interface obeying a Burgers orientation relationship (BOR) after FSW was first time directly observed, whose effect on the spheroidization was discussed. A new static spheroidization mechanism with the gradual coalescence of the adjacent lamellae was discovered, which we named as "termination coalescence". There was a slower coarsening rate in the lamellar structure than in the classical equiaxed one, due to the BOR in the lamellae, although both of them exhibited a volume diffusion character during annealing. Consequently, the similar superplasticity can be achieved for the base material and NZ after annealing. This study can provide a new way to the spheroidization and a theoretical basis for the integral superplastic forming of welds during production. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Friction stir welding Titanium alloys Spheroidization mechanism Coalescence Superplasticity Static annealing
资助者	National Natural Science Foundation of China ; Chinese Academy of Sciences Youth Innovation Promotion Association ; Liaoning Provincial Natural Science Foundation ; Liaoning Revitalization Talents Program
DOI	10.1016/j.jmst.2021.10.054
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[U1760201] ; Chinese Academy of Sciences Youth Innovation Promotion Association[2021193] ; Liaoning Provincial Natural Science Foundation[2021-YQ-01] ; Liaoning Revitalization Talents Program[XLYC2002099]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000788187900001
出版者	JOURNAL MATER SCI TECHNOL
引用统计	被引频次：15[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/321006/172555
专题	中国科学院金属研究所
通讯作者	Wu, L. H.
作者单位	1.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Jia, C. L.,Wu, L. H.,Xue, P.,et al. Static spheroidization and its effect on superplasticity of fine lamellae in nugget of a friction stir welded Ti-6Al-4V joint[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2022,119:1-10.
APA	Jia, C. L..,Wu, L. H..,Xue, P..,Zhang, H..,Ni, D. R..,...&Ma, Z. Y..(2022).Static spheroidization and its effect on superplasticity of fine lamellae in nugget of a friction stir welded Ti-6Al-4V joint.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,119,1-10.
MLA	Jia, C. L.,et al."Static spheroidization and its effect on superplasticity of fine lamellae in nugget of a friction stir welded Ti-6Al-4V joint".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 119(2022):1-10.