High temperature deformation behavior and hot processing map of Cu-Ni-Ti alloy

The Cu-Ni-Ti alloy was subjected to isothermal compression tests at temperatures ranging from 700 to 850 ℃ with deformation rates ranging from 0.01 to 10 s^-1 using MMS-100 thermal simulator. The results showed that with the increase of strain, the flow stress rapidly rose to the limit value and then gradually turned into an easy curve. The flow stress decreased with the increase of temperature and increased with the increase of strain rate. Based on the relationship between stress, deformation rate and strain temperature, the constitutive equation and hot processing map of Cu-Ni-Ti alloy were constructed. The optimal processing conditions of Cu-Ni-Ti alloys were in the range of temperature 840~850 ℃ and strain rate 0.1~1 s^-1. Under the optimal process conditions, the microstructure was an equiaxed crystal with dynamic recovery and recrystallization grain, and slender fibrous structure could be mostly found in the instability zone.