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Effects of Al content and alpha(2) precipitation on the fatigue crack growth behaviors of binary Ti-Al alloys

文献类型：期刊论文

作者Youssef, Sabry S.1,2; Zheng, Xiaodong1,2; Qi, Min1,2; Ma, Yingjie1,2,3; Huang, Sensen2,3; Qiu, Jianke2,3; Zheng, Shijian4; Lei, Jiafeng1,2,3; Yang, Rui1,2,3
刊名MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
出版日期2021-07-05
卷号819页码:17
ISSN号0921-5093
关键词Ti-Al binary Alloys Fatigue crack growth alpha(2) precipitation Crack closure
DOI10.1016/j.msea.2021.141513
通讯作者Ma, Yingjie(yjma@imr.ac.cn) ; Yang, Rui(ryang@imr.ac.cn)
英文摘要The influence of Al content and alpha(2) precipitation on the fatigue crack growth (FCG) behaviors of binary Ti - xAl (x = 2, 4, 6, 8 wt %) alloys was investigated. Ti-Al binary alloys with different Al contents were solution-treated and followed by aging treatment to obtain Widmanstatten microstructure and promote alpha(2) precipitation at higher Al content. Results show that the increase of Al content dramatically reduces the FCG rate. The enhanced resistance to FCG propagation is related to the increase of the critical resolved shear stress (CRSS) for dislocation slipping that acts as crack initiation sites, basing on solution strengthening with the addition of Al. Furthermore, roughness-induced crack closure with increasing the Al content also contributes to the decrease of FCG rate. With the increment of the Al content, the early fatigue crack propagation stage, in which the crack propagation significantly affected by microstructural factors, will be enlarged due to the decrease of crack tip plastic zone, leading to crack deflection and the reduction of FCG rate. In Ti-8Al alloy, the presence of alpha(2) precipitates and the increment of its size and volume fraction after aging treatment will result in significant increase of FCG rate. Moreover, the activation of large-scale slipping in relatively larger colonies promotes the crack to propagate along the large-scale slipping that induces smoother crack path and higher FCG rate.
资助项目Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22010101] ; National Key Research and Development Program of China[2016YFC0304201] ; National Key Research and Development Program of China[2016YFC0304206] ; Natural Science Foundation of China[51871225] ; Youth Innovation Promotion Association CAS and Liaoning Revitalization Talents Program[XLYC1907005]
WOS研究方向Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
出版者ELSEVIER SCIENCE SA
WOS记录号WOS:000668973200001
资助机构Strategic Priority Research Program of the Chinese Academy of Sciences ; National Key Research and Development Program of China ; Natural Science Foundation of China ; Youth Innovation Promotion Association CAS and Liaoning Revitalization Talents Program
源URL[http://ir.imr.ac.cn/handle/321006/159918]  
专题金属研究所_中国科学院金属研究所
通讯作者Ma, Yingjie; Yang, Rui
作者单位1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
3.Southern Marine Sci & Engn Guangdong Lab, Innovat Grp Marine Engn Mat & Corros Control, Zhuhai 519080, Peoples R China
4.Hebei Univ Technol, Res Inst Energy Equipment Mat, Sch Mat Sci & Engn, Tianjin 300130, Peoples R China
推荐引用方式
GB/T 7714		 Youssef, Sabry S.,Zheng, Xiaodong,Qi, Min,et al. Effects of Al content and alpha(2) precipitation on the fatigue crack growth behaviors of binary Ti-Al alloys[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2021,819:17.
APA Youssef, Sabry S..,Zheng, Xiaodong.,Qi, Min.,Ma, Yingjie.,Huang, Sensen.,...&Yang, Rui.(2021).Effects of Al content and alpha(2) precipitation on the fatigue crack growth behaviors of binary Ti-Al alloys.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,819,17.
MLA Youssef, Sabry S.,et al."Effects of Al content and alpha(2) precipitation on the fatigue crack growth behaviors of binary Ti-Al alloys".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 819(2021):17.

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来源：金属研究所

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