Property and thermal stability of in situ composite Cu-Cr alloy contact cable

摘要

The in situ composite Cu-Cr alloy, a new type of potential electric material that can be used for contact cables, is reported in this paper. The combination property and thermal stability of the in situ composite Cu-Cr alloy were investigated. Experimental results showed that the in situ composite Cu-Cr alloy has not only high room temperature properties, including ultimate tensile strength sigma_b, elongation rate 5, relative conductivity sigma_r, and combination property that is scaled by M index (sigma_b~2 k_r), but also excellent thermal stability of these properties. At room temperature, the combination property of in situ composite Cu-Cr could be up to 18.3 X 10~6 MPa~2 percent, which is higher than those of commonly used copper contact cables all over the world. After being heated for 3 h at 500 deg C, the combination property of the in situ composite Cu-Cr alloy only decreased 3 percent. In this paper, the relationship between thermal stability and strengthening mechanism of in situ composite alloy was analyzed.