Thermoplastic Deformation Behavior and Microstructure of Cu-Ti Alloy
Titanium bronze,with its excellent mechanical properties,elasticity,and resistance to stress relaxation,was expected to replace environmentally harmful beryllium bronze alloys and become a key material in the next generation of high-strength and high-elasticity applications.The hot deformation behavior of Cu-Ti alloys at deformation temperatures of 600-950 ℃ and deformation rates with 0.01-10 s-1 was investigated using a Gleeble-1500D thermal simulation tester.The constitutive relationship and hot working map of Cu-Ti alloys were established.Microstructural evolution and texture distribution of Cu-Ti alloys under different hot deformation processing conditions were discussed using Electron Backscatter Diffraction(EBSD)technology.The results show that the activation energy for hot deformation of Cu-Ti alloys is approximately 396.52 kJ/mol and the hot compression deformation constitutive equation agrees well with the experimental results.At a strain rate of 0.01 s-1,the stress decreases with the increas in deformation temperature.Fine recrystallized grains form a chain-like distribution along grain boundaries during the deformation temperature of 800 ℃ to 850 ℃,with a gradual reduction in Copper texture and an increase in Brass texture.Higher deformation temperatures and strain rates significantly accelerate the recrystallization transformation process.At 900℃,the content of Cube texture decreases,and the orientation of the recrystallized texture closely matches that of the deformed grains.Among the typical precipitation-strengthened copper alloys,Cu-Ti alloys have relatively low hot deformation activation energy,making them more susceptible to plastic deformation and offering good thermal processing stability and stable hot deformation microstructure.
万方数据
维普
