Thermodynamic Study of the Cu-Cr-Zr System

摘要

Of the high conductivity copper alloys which are capable of retaining their highstrength after exposure at high temperatures, the Cu-Cr-Zr alloys are the most promising. They can retain most effectively the strength after annealing at high temperatures without impairing their good electrical and thermal conductivities. Knowledge of the phase relations and the thermodynamic behavior of the phases in an alloy system is essential for improving the properties of the alloys and optimising the production techniques. But such knowledge has not been well established for the Cu-Cr-Zr system. In the present study, the phase diagrams of the Cu-Cr-Zr ternary and its sub-binary systems were optimised and calculated by using the CALPHAD method. An experiment was also carried out to check the reliability of the optimised thermodynamic parameters and clear up the confusion concerning the phase relationships in the Cu-rich corner of the Cu-Cr-Zr phase diagram.