Microstructure of Al_1.3CrFeNi eutectic high entropy alloy and oxidation behavior at 1000 °C

Al_1.3CrFeNi eutectic high entropy alloy was designed and prepared by arc-melting to investigate the microstructure and oxidation behaviors at 1000 °C. The XRD pattern shows that this alloy had a double bcc/B2 structure. SEM images indicates that the microstructure of the alloy is composed of two precipitates of [Cr, Fe] solid solution and NiAl intermetallic, which form the typical eutectic structure. To explore the thermal application of Al_1.3CrFeNi alloy, the oxidation behavior of Al_1.3CrFeNi alloy at 1000 °C was investigated. From XRD and SEM results, it could be concluded that Al_2O_3 and Cr_2O_3 were the predominant oxides during the oxidation process. In addition, spinel like FeCr_2O_4 was also observed in the oxide scale. According to the analysis of oxide precipitates, the whole process of oxides’ formation was discussed and a simplified oxidation dynamic model of Al_1.3CrFeNi alloy at 1000 °C was obtained. This could promote the development of thermal applications in multi-component alloys field.

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