Fatigue crack tip plastic zone of α?+?β titanium alloy with Widmanstatten microstructure

IMR OpenIR

	Fatigue crack tip plastic zone of α?+?β titanium alloy with Widmanstatten microstructure
其他题名	Fatigue crack tip plastic zone of α?+?β titanium alloy with Widmanstatten microstructure
	Yingjie Ma 1; Sabry S Youssef 1; Xin Feng 1; Hao Wang 1; Sensen Huang 1; Jianke Qiu 1; Jiafeng Lei 1; Rui Yang 1
	2018
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	34 期号:11 页码:2107-2115
摘要	The 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.
其他摘要	The 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.
关键词	Titanium alloy Widmanstatten microstructure CTPZ Slip Deformation twinning
收录类别	CSCD
语种	英语
CSCD记录号	CSCD:6373317
引用统计	被引频次：3[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/148584
专题	中国科学院金属研究所
作者单位	1.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.
推荐引用方式 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.