Microstructure, Mechanical Properties, and Corrosion Behavior of New βtype Ti–Mo–Nb Based Alloys by Mn Addition for Implant Material

C. Sutowo, S. Supriadi, A. Pramono, B. Suharno
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引用次数: 4

Abstract

Titanium alloys are widely used for biomaterial applications since they have special characteristics, especially better biocompatibility, superior corrosion behavior and lower modulus of elasticity compared to other conventional biomaterials. The development of existing Ti6Al4V alloys by creating new β-type Ti-Mo-Nb based alloys by modifying the addition of the Mn element as a beta phase stabilizer, so that the beta phase structure can have an effect to increase strength and reduce elastic modulus with good biocompatibility and toxicity. In the present work, Ti–Mo–Nb–(x)Mn alloys (x=0, 4, 8, and 12, mass fraction in  %) were prepared using an electric vacuum arc furnace with a tungsten electrode. The samples were homogenized at 1050°C for 6 h under a controlled argon atmosphere, and the effects of adding Mn on the mechanical properties and corrosion behavior of the alloys were investigated using X-ray fluorescence spectroscopy, X-ray diffraction, optical microscopy, hardness and ultrasonic tests, and potentiodynamic polarization test. The experimental results show that adding 4 %, 8 %, and 12 %Mn to a Ti–9Mo–6Nb alloy stabilizes the formation of the β-phase titanium, implying that the alloys have similar microstructures but different grain sizes. Potentiodynamic polarization measurements show that an increase of the Mn content in the Ti–9Mo–6Nb alloy decreases the corrosion resistance. At 4 %Mn, the alloy has an elastic modulus of 93 GPa and better corrosion resistance, with a relatively low corrosion rate amounting to 0.00290 mm per year, than those of a commercial Ti–6Al–4V alloy
新型β型Ti-Mo-Nb基合金的显微组织、力学性能和腐蚀行为
与其他传统生物材料相比,钛合金具有良好的生物相容性、优异的耐腐蚀性能和较低的弹性模量,因此被广泛应用于生物材料中。在现有Ti6Al4V合金的基础上开发出新型β型Ti-Mo-Nb基合金,通过添加Mn元素作为β相结构的稳定剂,使β相结构具有提高强度和降低弹性模量的作用,具有良好的生物相容性和毒性。在本工作中,用钨电极在真空电弧炉上制备了Ti-Mo-Nb - (x)Mn合金(x= 0,4,8和12,质量分数%)。通过x射线荧光光谱、x射线衍射、光学显微镜、硬度和超声测试以及动电位极化测试,研究了Mn对合金力学性能和腐蚀行为的影响。实验结果表明,在Ti-9Mo-6Nb合金中添加4%、8%和12%的Mn可以稳定β相钛的形成,表明合金具有相似的组织,但晶粒尺寸不同。动电位极化测量结果表明,随着Ti-9Mo-6Nb合金中Mn含量的增加,合金的耐蚀性降低。当锰含量为4%时,合金的弹性模量为93 GPa,具有较好的耐腐蚀性能,腐蚀速率为0.00290 mm /年,低于工业Ti-6Al-4V合金
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