Effects of Al2O3 Particles on Corrosion Behavior and Microstructure of Al–Al2O3 Composites and Texture of Aluminum Matrix

Abstract

In this paper, we studied the influence of alumina particles addition, 5, 10, and 15 wt %, on the microstructure after elaboration of Al–Al₂O₃ MMC composite, morphology and kinetic of corrosion, hardness, texture evolution of aluminum matrix. The results show distribution of alumina particles in shape of petal-like phase in some zones , in form of flack in another region for sample with 5% addition alumina, and in mixture between truncated petal-like phase and flake form particles for the sample with 10% addition of alumina, of flake in zone 1 one and a mixture of petal-like phase and flake in zone 2 for the sample with 15% addition of Al₂O₃, the samples with 5 and 10% Al₂O₃ were undergo generalized corrosion almost in the all surfaces, but for the sample with 15% addition of was undergo the corrosion which don’t tends to generalized corrosion. The corrosion resistance increase when the Al₂O₃ addition increases. The texture of aluminum changes slightly when the alumina powders are added to aluminum. The hardness change when alumina powders are added to aluminum.