The rapidly solidified β-type Ti–Fe–Sn alloys with high specific strength and low elastic modulus

Abstract

The β-type Ti–Fe–Sn alloys with high specific strength and low elastic modulus are prepared by rapidly solidified technology. The microstructure and mechanical properties of Ti–Fe–Sn alloys were investigated. The results show that the phases of Ti80Fe20 and Ti79Fe20Sn1 alloys are mainly composed of β-Ti phase, and of a small quantity of α-Ti and FCC TiFe phases. The phases of Ti77Fe20Sn3 and Ti75Fe20Sn5 alloys are composed of β-Ti, a large number of α-Ti, and a small quantity of TiFe phases. The contents of β-Ti phase reduce with increase of Sn content, and the corresponding contents of α-Ti phase increase with increase of Sn content. The Ti75Fe20Sn5 alloy that has high yield strength, high fracture strength, large plastic strain, and high specific strength can be considered as a new engineering alloy. The elastic modulus (33.6 GPa) of Ti75Fe20Sn5 alloy measured by using the nanoindentation technique is very close to that of human bone (10–30 GPa), and are the further smaller than the elastic modulus (120 GPa) of commercial Ti-6Al-4V biomedical alloy. The Ti75Fe20Sn5 alloy can be considered as a new biomedical alloy. The large H/Er and H3/Er2 of Ti77Fe20Sn3 and Ti75Fe20Sn5 alloys indicate the good wear resistance and anti-wear ability of materials, respectively.