Yang Xirong;Wang Bingbing;Qiang Meng;Liu Xiaoyan;Luo Lei;Wang Jingzhong;

• 1:School of Metallurgical Engineering
• 2: Xi'an University of Architecture and Technology

Abstract：

Ti-25Nb-3Zr-3Mo-2Sn(TLM) titanium alloy is a new type of sub-stable β-type medical titanium alloy without toxic elements and with excellent comprehensive mechanical properties independently researched and developed by Northwest Institute of Nonferrous Metals.With the advantages of low density,high yield stress,low modulus of elasticity,easy processing and molding,and lower cost,it has good application prospects in dental implants,bone and joint replacement materials,vascular stents,and other biomedical applications.In order to further optimize the modification and processing of this alloy,perfect its performance in corrosion,strength,elastic modulus,wear resistance,fatigue strength,etc.,and expand its application,this paper adopts the method of violent plastic deformation to prepare TLM titanium alloy ultrafine crystal materials.Strenuous plastic deformation(SPD) technology is currently recognized as an efficient way to prepare ultrafine crystalline materials,and is also an effective means to enhance the corrosion resistance of materials by refining the grain.Among many SPD methods,equal channel angular pressing(ECAP) is not only the most effective way to prepare three-dimensional large-size bulk fine-crystalline materials,but also has the advantages of a relatively simple process and low cost,and is one of the most promising SPD techniques for industrial application,which can improve the performance of metallic materials without changing the cross-sectional shape and the area of the object.area to improve the corrosion resistance of metallic materials.In this study,the composition(%,mass fraction) of TLM titanium alloy was Nb 25.8,Zr 2.96,Sn 2.03,Mo 3.08,Fe 0.02,C 0.02,O 0.044,N 0.003,and the rest of titanium,which was deformed by multiple ECAP passes at room temperature,with an internal mold angle Φ of 135° and an external arc angle ψ of 20°,and the selection of graphite and oil made by the group were used as lubricants,the press rod speed was 2.5 mm·s~(-1),the number of extrusion passes was 4,and the extrusion path was C-path.The solution samples are named ST,and ECAP deformation samples for passes 1,2,and 4 are named 1P,2P,and 4P.An electrochemical test system consisting of an electrochemical workstation,a three-electrode system,and a display device was used to test the corrosion properties of the specimens prepared by ECAP deformation.During the experiment,the working electrode was the test specimen,the auxiliary electrode was the platinum sheet electrode,the saturated calomel electrode was selected as the reference electrode,and the electrolyte solution was Hank's simulated body fluid,which was configured at a temperature of(36.5±0.5) ℃,and the final reagent maintainedpH value of 7.4 at 36.5 ℃.The microstructures of TLM titanium alloys without ECAP deformation and after ECAP were investigated by optical microscopy(OM),X-ray diffractometry(XRD),electron backscattering diffractometry(EBSD),and scanning electron microscopy(SEM).The results showed that the open-circuit potential,kinetic potential polarization curves,and alternating current impedance spectroscopy tests indicated that the open-circuit potentials of TLM titanium alloys in Hank's simulated body fluid environment all showed an increasing trend,with the lowest steady-state open-circuit potential for Sample ST and the highest steady-state open-circuit potential for Sample 4P.The impedance radius of ECAP deformed specimen was larger than that of Sample ST,and the radius gradually increased with the increase in the number of passes.The impedance spectra of TLM titanium alloys before and after deformation were fitted to an equivalent circuit using ZimpWin software,and the fitting results were good.After ECAP deformation,the number of corrosion pits in TLM titanium alloy was significantly less than that before deformation,and the oxygen content in the corrosion pits was significantly higher than that outside the corrosion pits.The passivation film was mainly an oxide formed by the oxygen in the air and the elements such as titanium and niobium,which effectively blocked the entry of the corrosive elements in the simulated body fluids.The tissues of Sample ST showed a coarse and equiaxial distribution,with the average grain size of about 50 μm.The grains were refined after the deformation of 1 pass.A large number of twins appeared inside the grains,mainly {332}<113> twins,and the number of {112}<111> twins was very small;after 2 passes of deformation,part of the grains were obviously elongated,with an increasing number of twins,and some twins penetrated through several grains,and{112}<111> twins were very few;after 4 passes of deformation,the grain deformation was very obvious,and the average size reached 7.1 μm.{112}<111> twins were still few.{112}<111> the number of twins increases,{332}<113> the number of twins decreases slightly,both parallel to each other and intersecting each other,making the twin morphology different.According to the classical Harris equation,texture coefficients value was obtained by calculating the weaving coefficient,and TC value of Sample ST was greater than 1 on(110) and(200) crystal planes,which indicated that there was a weak weaving on(110) and(200) crystal planes of TLM titanium alloy.After the first deformation,the titanium alloy hadan obvious selective orientation on(211) crystal plane,and the fabrication was stronger.TLM titanium alloy,after two deformations,had a strong fabrication on(110) crystal plane;after four deformations,TLM titanium alloy produced a selective orientation on(211) crystal plane,but the fabrication was weaker than that produced after one deformation.

Key Words： equal channel angular pressing(ECAP);Ti-25Nb-3Mo-3Zr-2Sn(TLM) titanium alloy;twins;corrosive properties

Abstract:

Keywords:

Foundation: 国家自然科学基金面上项目（51474170）;; 国家基金培育专项（X20240094）;; 陕西省自然科学基金面上项目（2026JC-YBMS-0586）资助

Authors: Yang Xirong;Wang Bingbing;Qiang Meng;Liu Xiaoyan;Luo Lei;Wang Jingzhong;

DOI: 10.13373/j.cnki.cjrm.XY25040019

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