Effects of Trace La on the Aging Properties of the Cu-Ti-Zr Alloys
摘要
Cu-2Ti-0.3Zr and Cu-2Ti-0.3Zr-0.2La alloys were prepared by vacuum melting, and their mechanical properties and conductivity were measured after aging treatment. Both alloys were aged at 450 °C for 30 min to obtain optimum properties, and the microhardness of the Cu-Ti-Zr-La alloy increased by 8.5% and the strength by 5% compared to the Cu-Ti-Zr alloy. Characterization of the alloys by EBSD revealed that the addition of La inhibits grain growth, refines the grains and enhances the texture. The Cu4Ti phase precipitated during the Cu-Ti-Zr alloy’s aging process, and the Cu5Zr phase precipitated after La was added. It was found by analyzing the strengthening mechanisms of the Cu-Ti-Zr-La alloy that precipitation strengthening significantly contributes to the alloy strength.