Investigation of deformation comprised microstructure and precipitation of Cu–Sn–Ti alloy during hot deformation

The hot deformation behavior of Cu-Sn-Ti-(Cr) alloys was studied using Gleeble-1500D thermo-mechanical simulator ranging from 550 to 950 °C, and the strain rate was 0.001∼10 s-1. The microstructure evolution of the alloy was analyzed using characterization methods such as electron backscatter diffraction (EBSD), scanning electron microscope (SEM) and transmission electron microscope (TEM). Cu-Sn-Ti-(Cr) alloys were calculated by establishing the constitutive equation of the alloy. The activation energies of Cu-Sn-Ti and Cu-Sn-Ti-Cr alloys are 275.884 and 283.550 kJ/mol, respectively. The results indicate that the addition of Cr element has an inhibitory effect on the nucleation and improve refinement of dynamic recrystallization (DRX) in Cu-Sn-Ti alloy. The texture of Cu-Sn-Ti alloy is Cu texture at 750 °C and the texture contained in Cu-Sn-Ti alloy is Goss texture, Cubic texture and Cu texture when the temperature is raised to 950 °C. The texture of Cu-Sn-Ti-Cr alloy at 750 °C is Goss texture. The Goss texture transforms into Cubic texture and Cu texture when the temperature is raised to 950 °C. The precipitates present in Cu-Sn-Ti alloy include CuSn3Ti5 phase and Cu4Ti phase. The addition of Cr element adds a new phase of Cr to the alloy and also makes the distribution of precipitates more uniform and increases in quantity.