Equimolar AlCuFeMn: A novel oxidation resistant alloy. (August 2021) - Sharma, Ritukesh
Abstract: High-temperature oxidation behavior of an equimolar AlCuFeMn multicomponent alloy was investigated at 500 °C and 1000 °C for 50 h of exposure in ambiance. Relative weight gain after oxidation was 0.5 mg cm −2 and 0.3 mg cm −2 at 500 °C and 1000 °C, respectively. At 500 °C, the oxidized surface comprised of a manganese-rich oxide layer with an aluminum oxide sublayer, while only an aluminum-rich oxide layer was observed at 1000 °C. The alloy microstructure was temperature stable and consisted of an FCC, BCC, and a minor Al11 Mn4 phase. The alloy's oxidation resistance compared well with 9% Cr steel and nickel-based superalloys suitable for high-temperature applications. Highlights: An equimolar AlCuFeMn alloy button produced by arc melting is vacuum annealed at 900°C. The alloy is stable up to 1000 °C and consists of Fe-rich BCC α, Cu-rich FCC β, and a minor Al11 Mn4 phase. Alloy oxidized at 500 °C results in a manganese-rich oxide scale with an aluminum oxide sublayer. At 1000 °C, oxidized alloy consists of only an aluminum-rich oxide scale. The relative weight gain of the alloy at 500 °C and 1000 °C is comparable to Inconel 740 and AISI 304 alloy.