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Fatigue crack tip plastic zone of α?+?β titanium alloy with Widmanstatten microstructure
Alternative TitleFatigue crack tip plastic zone of α?+?β titanium alloy with Widmanstatten microstructure
Yingjie Ma1; Sabry S Youssef1; Xin Feng1; Hao Wang1; Sensen Huang1; Jianke Qiu1; Jiafeng Lei1; Rui Yang1
2018
Source PublicationJournal of Materials Science & Technology
ISSN1005-0302
Volume34Issue:11Pages:2107-2115
AbstractThe recent studies had focused on the fatigue crack propagation behaviors of α?+?β titanium alloys with Widmanstatten microstructure. The fascinated interest of this type of microstructure is due to the superior fatigue crack propagation resistance and fracture toughness as compared to other microstructures, which was believed to be related to the fatigue crack tip plastic zone (CTPZ). In this study, the plastic deformation in fatigue CTPZ of Ti-6Al-4V titanium alloy with Widmanstatten microstructure was characterized by scanning electron microscope (SEM) and electron backscatter diffraction (EBSD). The results showed that large-scale slipping and deformation twinning were generated in fatigue CTPZ due to the crystallographic feature of the Widmanstatten microstructure. The activation of twinning was related to the rank of Schmid factor (SF) and the diversity of twin variants developing behaviors reflected the influence of SF rank. The sizes of CTPZ under different stress intensity factors ( K ) were examined by the white-light coherence method, and the results revealed that the range of the plastic zone is enlarged with the increasing K (or crack length), while the plastic strain decreased rapidly with the increasing distance from the crack surface. The large-scale slipping and deformation twinning in Widmannstatten microstructure remarkably expanded the range of fatigue CTPZ, which would lead to the obvious larger size of the observed CTPZ than that of the theoretically calculated size.
Other AbstractThe recent studies had focused on the fatigue crack propagation behaviors of α+β titanium alloys with Widmanstatten microstructure. The fascinated interest of this type of microstructure is due to the superior fatigue crack propagation resistance and fracture toughness as compared to other microstructures, which was believed to be related to the fatigue crack tip plastic zone (CTPZ). In this study, the plastic deformation in fatigue CTPZ of Ti-6Al-4V titanium alloy with Widmanstatten microstructure was characterized by scanning electron microscope (SEM) and electron backscatter diffraction (EBSD). The results showed that large-scale slipping and deformation twinning were generated in fatigue CTPZ due to the crystallographic feature of the Widmanstatten microstructure. The activation of twinning was related to the rank of Schmid factor (SF) and the diversity of twin variants developing behaviors reflected the influence of SF rank. The sizes of CTPZ under different stress intensity factors (K) were examined by the white-light coherence method, and the results revealed that the range of the plastic zone is enlarged with the increasing K (or crack length), while the plastic strain decreased rapidly with the increasing distance from the crack surface. The large-scale slipping and deformation twinning in Widmannstatten microstructure remarkably expanded the range of fatigue CTPZ, which would lead to the obvious larger size of the observed CTPZ than that of the theoretically calculated size.
KeywordTitanium alloy Widmanstatten microstructure CTPZ Slip Deformation twinning
Indexed ByCSCD
Language英语
CSCD IDCSCD:6373317
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/148584
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.中国科学技术大学
3.东北大学
4.
Recommended Citation
GB/T 7714
Yingjie Ma,Sabry S Youssef,Xin Feng,et al. Fatigue crack tip plastic zone of α?+?β titanium alloy with Widmanstatten microstructure[J]. Journal of Materials Science & Technology,2018,34(11):2107-2115.
APA Yingjie Ma.,Sabry S Youssef.,Xin Feng.,Hao Wang.,Sensen Huang.,...&Rui Yang.(2018).Fatigue crack tip plastic zone of α?+?β titanium alloy with Widmanstatten microstructure.Journal of Materials Science & Technology,34(11),2107-2115.
MLA Yingjie Ma,et al."Fatigue crack tip plastic zone of α?+?β titanium alloy with Widmanstatten microstructure".Journal of Materials Science & Technology 34.11(2018):2107-2115.
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