Effect of Solid Solution Process on Microstructure and Properties of Cu-Cr-Mg Alloy

In the present study, Cu-Cr-Mg alloy wire rod was prepared by up drawing continuous casting and multi pass drawing. The effects of solid solution process on the strength and conductivity of Cu-Cr-Mg alloy were studied. The solid solubility of Cu-Cr-Mg alloy under different solid solution processes was evaluated by XRD. The types and morphology of nano precipitates of the two alloys under different thermomechanical treatment processes were compared by selected area electron diffraction in TEM, and the recrystallization degree of peak aged Cu-Cr-Mg alloy was analyzed by EBSD. The results show that the supersaturated solid solubility of as cast Cu-Cr-Mg alloy is equivalent to that of as cast Cu-Cr-Mg alloy after holding at 950 °C for 1 h and water quenching. At the same time, the strength of as cast Cu-Cr-Mg alloy is 52.2 MPa higher than that of solution treated Cu-Cr-Mg alloy, and the conductivity drop is only 6.3% IACS. The microstructure results show that there are a large number of dispersed nano-sized precipitates in the two alloy matrices, and the size of the precipitates is close to each other. The results calculated by the strengthening model are also close to the experimental results.