Abstract
The microstructure and mechanical properties of rapidly solidified β-type Ti–Fe–Sn–Mo alloys with high specific strength and low elastic modulus were investigated. The results show that the phases of Ti–Fe–Sn–Mo alloys are composed of the β-Ti, α-Ti, and TiFe phases; the volume fraction of TiFe phase decreases with the increase of Mo content. The high Fe content results in the deposition of TiFe phase along the grain boundary of the Ti phase. The Ti75Fe19Sn5Mo1 alloy exhibits the high yield strength, maximum compressive strength, large plastic deformation, high specific strength, high Vickers hardness, and large toughness value, which is a superior new engineering material. The elastic modulus (42.1 GPa) of Ti75Fe15Sn5Mo5 alloy is very close to the elastic modulus of human bone (10–30 GPa), which indicating that the alloy can be used as a good biomedical alloy. In addition, the large H/Er and H3/Er2 values of Ti75Fe19Sn5Mo1 alloy indicate the good wear resistance and long service life as biomedical materials.
Highlights
Ti alloys have been widely used in engineering structural materials and biomedical materials [1,2,3,4,5].As engineering structural materials, Ti alloys have low density, high strength, and good corrosion resistance, and they are widely used in automotive, aerospace and other fields [1,4,5]
Among Ti-based alloys, Ti–Fe-based alloys are favored by researchers of engineering materials, functional materials and biomedical alloys, based on high strength, low density, high specific strength, and low elastic modulus [11,12,13,14,15]
Ti–Fe based alloys were generally selected in hypereutectic regions, such as the binary Ti65 Fe35 hypereutectic alloy, which has high fracture strength and yield strength, and the plastic deformation can reach 6.7%; the microstructures of Ti65 Fe35 alloy are composed of β-Ti and a large number of TiFe phases [16]
Summary
Ti alloys have been widely used in engineering structural materials and biomedical materials [1,2,3,4,5]. Ti–Fe based alloys were generally selected in hypereutectic regions, such as the binary Ti65 Fe35 hypereutectic alloy, which has high fracture strength and yield strength, and the plastic deformation can reach 6.7%; the microstructures of Ti65 Fe35 alloy are composed of β-Ti and a large number of TiFe phases [16]. For hypereutectic Ti–Fe alloys, the high content of brittle TiFe phase leads to the low ductility of the alloys. The (Ti0.705 Fe0.295 )96.15 Sn3.85 alloy exhibits high yield strength of 1794 MPa and large plastic deformation of 9.6% [15]; the ductility of the (Ti0.705 Fe0.295 )93.15 Sn3.85 Nb3 alloy can be further improved [19]. It is necessary to reduce the content of brittle TiFe phase and prepare alloys by rapid solidification to further improve the strength and plasticity of Ti75 Fe20 Sn5 alloy. The experimental data obtained can be used as reference for engineering application and biomaterial application
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