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Fatigue crack tip plastic zone ofα+βtitanium alloy with Widmanstatten microstructure

查看全文 作　　者：Yingjie [1,2]Ma;Sabry [1,2]S.Youssef;Xin [1]Feng;Hao [1,2]Wang;Sensen [1,3]Huang;Jianke [1]Qiu;Jiafeng [1,2]Lei;Rui [1,2]Yang 高影响力作者 机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;[2]University of Science and Technology of China(USTC),Hefei 230026,China;[3]Northeastern University,Shenyang 110089,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2018年第34卷第11期,共9页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Nos.51401221 and 51671195);Youth Innovation Promotion Association CAS 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-6 A1-4 V 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：微观结构 疲劳裂缝 裂缝尖端 Β钛合金 塑料 扫描电子显微镜 繁殖行为 裂缝长度
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