Effect of 3 GPa Pressure Treatment on the Solid-State Phase Transformation of Cu-11.76Al Alloy during Heating Process

Abstract

Cu-11.76Al alloy was treated at 3 GPa and 700 °C for 15minutes, the solid-state phase transformation temperature and time of Cu-11.76Al alloy before and after 3 GPa pressure treatment during heating process were measured by DSC (differential scanning calorimeter), its activation energy was also calculated, and the microstructures of Cu-11.76Al alloy before and after 3 GPa pressure treatment were analyzed by metallurgical microscope and transmission electron microscopy. Based on the experimental results, the effect of 3 GPa pressure treatment on the solid-state phase transformation of Cu-11.76Al alloy during heating process was investigated. The results show that 3 GPa pressure treatment can decrease the temperature and activation energy of α + γ2→ß transformation of Cu-11.76Al alloy, shorten the phase transformation time, which is helpful for the phase transformation. The main reason is that 3 GPa pressure treatment can refine the grains and increase dislocation density of Cu-11.76Al alloy.