Development of high corrosion resistant and wear resistant Ti-Zr alloys for bone substitution

本研究的目的是开发一种具有低杨氏模数、高耐腐蚀性和耐磨性的新型钛合金。合金元素选择与钛形成连续固溶体的锆和Hf。在所研究的所有Ti-Zr和Ti-Hf合金中，Ti-60at.%Zr合金的杨氏模数最低，为89.5 Gpa。添加Zr和Hf后，合金的维氏硬度显著提高，机械强度显著提高。这表明，与纯钛相比，Ti-Zr和Ti-Hf合金的耐磨性有了很大的提高。在37℃的除氧0.9%NaC l水溶液中，所有制备的Ti-Zr和Ti-Hf合金的线性扫描伏安曲线表明，在人体内使用的添加剂元素(Zr，Hf)应限制在50at.%左右。

The objectives of the current study were to develop a new titanium alloy with low Young's modulus, high corrosion and wear resistances. Zirconium and hafnium which form a continuous solid solution with titanium were chosen as an alloying element. A Ti-60 at.% Zr alloy showed the lowest Young's modulus of 89.5 GPa within all the Ti-Zr and Ti-Hf alloys examined. The addition of Zr and Hf remarkably increased Vickers hardness number, showing marked increases of mechanical strength. This suggests that the wear resistance of the Ti-Zr and Ti-Hf alloys is greatly improved compared to that of pure Ti. The linear sweep voltammetry of all the prepared Ti-Zr and Ti-Hf alloys in a deaerated 0.9% NaCl aqueous solution at 37℃ suggested that additive elements (Zr, Hf) should be restricted up to about 50 at.% for use in a human body.