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INFLUENCES OF DISLOCATIONS ON NUCLEATION AND MICRO-TEXTURE FORMATION OF alpha PHASE IN Ti-6Al-4V ALLOY
Zhang Jinhu1; Xu Dongsheng1; Wang Yunzhi2; Yang Rui1
Corresponding AuthorXu Dongsheng(dsxu@imr.ac.cn)
2016-08-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume52Issue:8Pages:905-914
AbstractTitanium alloys are widely applied in aerospace, chemical and other related industries. The alpha+beta alloys may obtain various microstructures and mechanical properties simply by varying their thermomechanical processing. Ti-6Al-4V alloy is the most common alpha+beta titanium alloy. Its strength, ductility, fracture toughness and fatigue properties depend strongly on the microstructure especially texture. The understanding of the formation mechanisms of a micro-texture during processing is necessary for the optimization of the mechanical properties. In this work, the nucleation of a precipitates and micro-texture formation process :tinder the influence of dislocations during the beta -> alpha transformation in Ti-6Al-4V alloy was simulated by phase field method. The stress field of an infinite straight dislocation was calculated by Willis-Steeds-Lothe method and used as input of the phase field model. It was shown that the normal stress component S-33 plays a dominant role in a variants nucleation in the presence of edge dislocation, while the shear stress component S-23 is the most important one for screw dislocation. The effect of edge dislocation on a variant selection is generally stronger than that of screw. V1 and V7 are the main variants selected by the edge dislocation while V7, V10 and V12 dominate around the screw dislocation, with V1/V7, V1/V4/V6 being the main variant cluster types around the edge dislocation, and V7/V10/V12 being the primary one for the screw dislocation. In a system with the presence of dislocations in the parent phase, the precipitate microstructure is determined by the combined effect of elastic interactions between the dislocation and different variants of a low symmetry precipitate phase, and elastic interactions among different variants. Variants with interfaces of relatively high energy may appear because of variants selection by dislocations.
KeywordTi-6Al-4V alloy dislocation phase field simulation variant selection micro-texture
Funding OrganizationNational Basic Research Program of China ; National Natural Science Foundation of China
DOI10.11900/0412.1961.2016.00053
Indexed BySCI
Language英语
Funding ProjectNational Basic Research Program of China[2006CB605104] ; National Basic Research Program of China[2011CB606404] ; National Natural Science Foundation of China[51101158] ; National Natural Science Foundation of China[51171195]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000381541900002
PublisherSCIENCE PRESS
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/122840
Collection中国科学院金属研究所
Corresponding AuthorXu Dongsheng
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Ohio State Univ, Columbus, OH 43210 USA
Recommended Citation
GB/T 7714
Zhang Jinhu,Xu Dongsheng,Wang Yunzhi,et al. INFLUENCES OF DISLOCATIONS ON NUCLEATION AND MICRO-TEXTURE FORMATION OF alpha PHASE IN Ti-6Al-4V ALLOY[J]. ACTA METALLURGICA SINICA,2016,52(8):905-914.
APA Zhang Jinhu,Xu Dongsheng,Wang Yunzhi,&Yang Rui.(2016).INFLUENCES OF DISLOCATIONS ON NUCLEATION AND MICRO-TEXTURE FORMATION OF alpha PHASE IN Ti-6Al-4V ALLOY.ACTA METALLURGICA SINICA,52(8),905-914.
MLA Zhang Jinhu,et al."INFLUENCES OF DISLOCATIONS ON NUCLEATION AND MICRO-TEXTURE FORMATION OF alpha PHASE IN Ti-6Al-4V ALLOY".ACTA METALLURGICA SINICA 52.8(2016):905-914.
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