Simple ordered L12 phase and complex ordered µ phase were found in the (FeCoNiMo)90Al10 alloy, while disordered FCC and µ phases were detected in the (FeCoNiMo)90Cr10 alloy. After annealing at 900°C, nano-size precipitates were observed in the L12 phase, and splitting and spheroidisation were occurred in some regions of the eutectic structures in the (FeCoNiMo)90Cr10 alloy. After holding for 100 h at 900°C, (FeCoNiMo)90Al10 alloy showed an excellent hardness resistance. The oxidation kinetics of both (FeCoNiMo)90Al10 and (FeCoNiMo)90Cr10 alloys followed a parabolic rate law at 900°C. An external layer of Al2O3 and an underlying MoO2 subscale were found in the (FeCoNiMo)90Al10 alloy. A semi-continuous oxide layer of MoO2 and Cr2O3 was observed in the (FeCoNiMo)90Cr10 alloy.
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