低弹性模量Ti-Nb-Zr合金的显微组织与力学性能

Microstructure and Mechanical Properties of Ti-Nb-Zr Alloys with Low Elastic Modulus

摘要: 为了降低医用植入物材料的弹性模量,通过选取不同含量的铌和锆,采用真空非自耗电弧炉熔炼了四种成分的Ti-Nb-Zr合金:Ti30Nb7Zr(T1)、Ti30Nb13Zr(T2)、Ti40Nb7Zr(T3)和Ti40Nb13Zr(T4);对四种合金进行了锻造处理,然后在β相区进行固溶,对其固溶后的力学性能、显微组织进行了研究.结果表明:T1和T2合金是β相＋α″相的两相组织,随着锆含量不同,α″相形貌及数量也各不相同;T3和T4合金是单一β相组织;四种合金的弹性模量均低于80 GPa,其中T2合金的弹性模量为58 GPa,与人体骨骼的弹性模量最为接近.

Abstract: In order to lower the elastic modulus of biomedical implant materials,four alloys of Ti30Nb7Zr (T1),Ti30Nb13Zr (T2),Ti40Nb7Zr (T3) and Ti40Nb13Zr (T4) with different contents of Nb and Zr,were prepared by vacuum arc melting.The alloys were subjected to solution treatment in β phase field after forging.Their mechanical properties and microstructure were detected.The results indicated that the microstructure of T1 and T2 alloy were α″＋β binary phase structure.And the appearance and quantity of α″ phase were different with the increase of Zr content.Microstructure of T3 and T4 alloys were single β phase structure.The T2 alloy possessed the lowest elastic modulus (58 GPa) among the four alloys with elastic modulus from 58 to 73 GPa,and is fitter for implant materials of body than others.