新型医用TiNbZrFe合金的组织和力学性能

Microstructures and mechanical properties of metastable β type TiNbZrFe alloys for biomedical application

为研究开发高强度、低弹性模量、低成本医用β型钛合金,根据d-电子合金设计理论设计了Ti-28Nb-13Zr-0.5Fe(质量分数%)、Ti-28Nb-13Zr-2Fe(质量分数%)和Ti-35Nb-13Zr-2Fe(质量分数%)3种β型钛合金.利用光学显微镜、TEM和XRD观察和分析了β相区固溶处理后合金微观组织形貌和物相组成,利用拉伸试验测试了其室温力学性能.结果表明:3种合金固溶处理后,分别获得β+α″+溶质原子不均匀区、β+溶质原子不均匀区和稳定、单β相组织.具有β+α″+溶质原子不均匀区混合结构的Ti-28Nb-13Zr-0.5Fe(质量分数%)合金具有高强度和低弹性模量的最佳匹配.Nb在合金中具有细化晶粒的作用.

Three kinds ofβ type titanium alloys Ti - 28Nb - 13Zr - 0. 5Fe （ mass fraction% ）, Ti - 28Nb - 13Zr - 2Fe （mass fraction% ） and Ti - 35Nb - 13Zr - 2Fe （ mass fraction% ） were designed by d - electron alloy design theory in order to develop titanium alloys with high strength, low elastic modulus and low cost for biomedical application. The mierostruetures and phase constitutes of alloys after solution treatment were observed and analyzed by optical microscope, TEM and XRD. Meehanieal properties were tested by tensile test. The results indicate that the mierostructures of β＋α＋solute atom inhomogeneous zones, β ＋ solute atom inhomogeneous zones, single β phase is obtained in three alloys, respectively. The Ti -28Nb - 13Zr -0. 5Fe （ mass fraction% ） alloy with microstructure of β＋α＋ solute atom inhomogeneous zones gets the best match of high strength and low modulus. Nb obviously decreases β grain size in the studied alloy.