Abstract:In this paper, titanium-silicon brass with different Si contents was prepared by the melt reaction method. X-ray diffractometer (XRD) and scanning electron microscope (SEM) were used to characterize the evolution of three-dimensional morphology and phase composition of the hard phase, and analyzed the effect of Si content on the solidification structure of titanium-silicon brass. The relationship between the microstructure and mechanical properties of titanium silicon brass was investigated in combination with hardness and tensile property testing. The results showed that with the increase of Si content, the synthesized hard phase transformed from lamellar dendritic AlCu2Ti phase and hexagonal prism Ti5Si3 phase to polyhedral Ti5Si4 phase, and the volume fraction of the hard phase showed a trend of increasing first and then stabilizing. When the Si content is added to 1.5%(mass fraction), a large amount of unreacted Si element promotes the formation of γ phase matrix, and the alloy matrix transforms from a single β phase to a β+γ phase. When the Si content changed from 0.25% to 1.5%, the tensile strength and hardness of titanium-silicon brass continued to increase with the increase of Si content, and the elongation after fracture showed a trend of first increasing and then decreasing, which is attributed to the formation of γ phase. When the Si content was 1.0%, the best combination of strong plasticity of titanium-silicon brass was presented, the tensile strength, yield strength and elongation after fracture were (551±21) MPa, (276±16) MPa and 6.8%±0.3%, respectively.