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为了开发新型的生物医用β型钛合金,设计并采用电弧熔炼方法制备Ti-15Mo-xNb(x=0.5,10和15,质量分数,%)合金,研究添加元素Nb对4种合金显微组织、力学性能和铸造性能的影响。相分析和组织观察结果表明,4种合金均由单一的β相组成,随着Nb含量的增加,合金的显微组织细化。β型Ti-15Mo-xNb合金具有较高的塑性和相当低的压缩弹性模量(18.388~19.365 GPa)。添加Nb元素后,合金的压缩屈服强度增高,随着Nb含量的增加,合金的显微硬度降低。在冷压缩变形后,4种合金均呈现明显的纤维带状组织。4种合金的充型实验表明:添加Nb元素后,合金的充型能力降低,Ti-15Mo合金的充型性能(92.01%)最好。
Ti-15Mo-xNb (x = 0.5, 10 and 15, mass fraction,%) alloys were designed and prepared by arc melting method for the development of a new type of biomedical β-type titanium alloy. The effects of addition of Nb on the microstructure of four alloys , Mechanical properties and casting performance. The results of phase analysis and microstructure observation show that the four alloys consist of a single β phase. The microstructure of the alloy is refined with the increase of Nb content. β-type Ti-15Mo-xNb alloy with high plasticity and relatively low compressive elastic modulus (18.388 ~ 19.365 GPa). When Nb is added, the compressive yield strength of the alloy increases. With the increase of Nb content, the microhardness of the alloy decreases. After cold compression deformation, the four kinds of alloys showed obvious ribbon structure. The filling experiments of the four alloys showed that the filling ability of the alloy decreased with the addition of Nb, and the filling performance of the Ti-15Mo alloy was the best (92.01%).