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《Materials Review》 2017-13
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Effect of Microstructure on Necking of Medical U-shaped Nail of TC4 Titanium Alloy

BAI Pengfei;MIN Xiaohua;TAO Xiaojie;ZHONG Gongcheng;BAI Shuyu;CHENG Congqian;ZHAO Jie;School of Materials Science and Engineering,Dalian University of Technology;Dalian SUNTEC TITANIUM LTD;  
Microstructure and mechanical properties of two medical TC4 titanium alloy bars,which made medical U-shaped nails with different necking size,were studied by optical microscope,Vickers hardness,tensile test,X-ray diffraction(XRD)and electron backscatter diffraction(EBSD).Based on the difference of microstructure and mechanical properties of two TC4 alloy bars,the reason why necking of U-shaped nails didn′t unit had been explored.The results show that microstructure of two TC4 alloy bars are uniform at the cross-section.However,αphase of big necking bar is mainly deformed grain at the longitudinal-section,while the small necking bar is mainly equiaxial grain.In addition,βphase of two bars has no obvious difference.The Vickers hardness and yield strength of big necking bar are higher than that of small necking bar.The different degree of recrystallization of two bars contributes to the different microstructure and mechanical properties,which results in the difference of necking size of U-shaped nails.
【CateGory Index】: R318.08;TG146.23
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