Preparation of Cu/Cr2O3 Composites by Mechanical Activation and In Situ Oxidation

In order to improve the in situ oxidation kinetic condition of Al in Cu matrix, Cr, instead of Al was in situ oxidized to form Cu/Cr 2 O 3 composites in the present investigation, Cu-Cr powders with different solubilities after mechanical activation were utilized to synthesize Cu/Cr 2 O 3 composites, and their microstructure and stability were analyzed. The results show that although the Cu-Cr powders suffer from the same mechanical activation; Cr 2 O 3 particles formed by the powders with different solubilities have great differences in size, amount, and distribution. In the range of experiments, the Cu/Cr 2 O 3 composite formed by Cu-Cr powders with 67% solution has large amounts of finer Cr 2 O 3 particles uniformly distributed in Cu matrix and the best stability at elevated temperatures.