Abstract
The oxidation behavior of an aluminum composite reinforced with albite particles of 1, 2, 3, and 4 wt.% at 500 to 800 K has been investigated. Within the experimental temperature range, a parabolic weight change/area was observed with activation energy. The weight change/area as a function of oxidation time becomes linear after an initial period. On oxidation, formation of an oxide scale was found whose morphology depends on temperature, cooling rate, and subscale formation at the interface between the matrix and reinforcement. Detailed analysis by scanning electron microscopy (SEM) showed that the oxide scales were not homogenous throughout, but exhibited several layers, which differ in microstructure and composition with an increase in thickness. The presence of albite particulate reinforcement significantly affects the oxidation behavior. The interface oxidization kinetics was found to be higher than that in the other regions. The oxidation products were both metallic oxides and their respective alloying element oxides. The exposure time of specimens to oxidation was 1000 min, chosen to study oxidation behavior at different temperatures. The aging of both matrix and composite specimens improves oxidation resistance due to the residual stress-relaxation phenomena accompanying these specimens.
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Sharma, S.C. Effect of aging on oxidation behavior of aluminum-albite composites at high temperatures. J. of Materi Eng and Perform 9, 344–349 (2000). https://doi.org/10.1361/105994900770346033
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DOI: https://doi.org/10.1361/105994900770346033