Abstract
The laser melting deposition technique was employed to fabricate a high entropy alloy of body-centered-cubic (BCC) AlCoCrFeNi with varying grain sizes. Subsequent annealing or quenching heat-treatment resulted in the precipitation of additional fine face-centered-cubic (FCC) phases. Oxidation at 1000 °C showed that the refinement of grains unexpectedly weakened the ability of the BCC alloy to sustain steady-state growth of an external Al2O3 scale, while the formation of FCC phases proved beneficial in promoting and maintaining exclusive and consistent growth of Al2O3 scale. The reasons behind these findings were thoroughly elucidated based on microstructural investigations of the formed oxide scales.
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