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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.
2019-03-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume166Pages:371-385
AbstractIt 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.
KeywordFriction stir Titanium Recrystallization Deformation Finite element simulation
Indexed BySCI
Language英语
WOS IDWOS:000459358200033
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81319
Collection中国科学院金属研究所
Recommended Citation
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.
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