| الوصف: |
High temperature oxidation of Al86Ce10Fe4 amorphous alloy at 630°C in static air for 15, 60, 300, 600, 1,200, 3,000, 6,000 and 12,000 minutes was studied. The morphology, composition and microstructure of the oxide films were investigated using SEM, EDS and XRD. The hardness and corrosion resistance of the oxide films were determined by micro-indentation and polarization technique. The results indicate oxidation at 630 °C instigates nucleation, growth and coarsening of fcc-Al, Al11Ce3 and Al13Fe5 crystalline phases inside the Al86Ce10Fe4 matrix, reducing the hardness of the alloy, and oxidation of the alloy surface, forming crystallized Al2O3 and AlFeO3 chemical compounds. Active anodic dissolution behavior and diffusion-controlled cathodic polarization of the oxidized alloy were observed. The corrosion resistance of the oxide films rates in the level of 10-7 ~10-5 [A/cm2]. The results demonstrate Al86Ce10Fe4 amorphous alloy, as a new-developed high temperature high strength glass, exhibits potential application for aerospace and national defense in terms of its high mechanical strength, high temperature endurance, and satisfactory oxidation and corrosion resistance. |
