Abstract
The phase analysis of Cu-0.41%Cr-0.20%Zr alloy treated by vacuum melting + solid solution + aging was carried out by means of SEM, TEM, EDXS and XRD. The results show that there are three phases in the alloy, namely the copper matrix phase, the chrome-rich phase and the zirconium-rich phase. The distribution of phase size is bimodal. The coarse phase size is microns scale, and the main components are elemental chromium and Cu5Zr, which are formed during the casting process and are not easy to dissolve in the subsequent aging process. The fine phase size is nanometer scale, and the composition is ordered bcc pure chromium and Cu5Zr. There is no chromium and zirconium intermediate phase. Under this condition, the volume fraction of precipitated phase is about 30 %. The heat treatment process can be further optimized by increasing the aging temperature, lengthening the aging time or adopting the second aging method.
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