Abstract
Two kinds of CuO/Al composites and TiO2/Al composite were prepared by powder meturllagy involves hot pressing. Afterward, structures and hardness changes were investigated by means of Electron Probe Micro Analyzer, X-ray diffraction equipment and Vickers hardness tester.
In the case of 3mass%CuO/Al composites, CuO was deoxidized by aluminum during heating at 823K, as a result, Cu dissolved into aluminum matrix and CuO particles are gradually replacing Al2O3 particles on in-situ manner. Consequently Al2O3/Al composite was made and it revealed age hardning by isothermal heat treatment. On the other hand, 10mass%CuO/Al composite, intermetallic compound Al2Cu was formed in the matrix due to excessive amount of Cu atoms.
In the case of TiO2/Al composite, since Ti atoms diffused toward aluminum matrix, detrimental Al3Ti were formed in the aluminum matrix and at the same time TiO2 was transformed into Al2O3.
