Study On The Micorstructure And Mechanical Property Of The Biomedical TiNbSn Alloys

Among biomaterials used for implants,β-type titanium alloys have attracted increasing attention due to their excellent biocompatibility,high corrosion resistance and low Young’s modulus.At present,elastic modulus of β-type titanium alloys are still higher than the elastic modulus of bone.Studies have shown that the intermetallic compound Ti₃ Sn has low elastic modulus at room temperature.This paper tries to composite Ti₃ Sn and β-type titanium alloys for low Young’s modulus of the alloys.In this article,through referencing the Ti-Sn binary phase diagram,three groups TiNbSn alloys are designed:(Ti₈₇Sn₁₃)_100-xNb_x,（Ti90Sn10）100-xNbx and（Ti93Sn7）100-xNbx（x=5,10,15,figures show the at%）.We have prepared three groups alloys by arc melting,and the alloys get solution and aging treatment.We observe the microstructure of TiNbSn alloys by scanning electron microscope,transmission electron microscope and X-ray diffraction machine.We use the tensile testing machine to test the mechanical properts of alloys.The results show that the casted(Ti₈₇Sn₁₃)_100-xNb_x alloys are made up by β phase and Ti₃ Sn phase turning to a single β phase with the contents of Nb increasing.The solution-treated alloys dissolve out a lot of Ti₃ Sn,and the elastic modulus of allys go through up and down with the solution temperature increasing.The casted（Ti90Sn10）100-xNbx alloys are made up by α phase turning to β phase with the contents of Nb increasing.The solution-treated alloys dissolve out some Ti₃ Sn and the elastic modulus is decreasing with the solution temperature increasing.The microstructure of the aging-treated alloys is nearly no change,but the elastic modulus is increasing with the aging treatment temperature and time increasing.The casted（Ti93Sn7）100-xNbx alloys are made up by lots of α phase and a little β phase turning to β phase with the contents of Nb increasing.The solution-treated alloys dissolve out little Ti₃ Sn and the elastic modulus is higher.The microstructure of the aging-treated alloys is nearly no change,but the elastic modulus is much higher.