Investigation on the Cu–Cr–RE alloys by rapid solidification

The paper presents a process where Cu–Cr–RE alloys are produced by rapid solidification powder metallurgy, composite green compact, extrusion and sinking. The lattice parameter of the copper-rich solid solution in powders is determined by X-ray diffraction. A significant increase in the extension of the solid solubility of chromium and rare-earth in copper is achieved with this process. The microstructures of the alloys are examined by transmission electron microscopy. Hardness and tensile properties are evaluated. The strengthening mechanism of alloys includes fine grain, dispersion and precipitation strengthening. The electrical conductivity is higher than the conventional Cu–Cr and Cu–Al2O3 alloys.