Abstract
High-entropy Mn-based damping alloy is very promising for high-temperature service, and a MnCuNiFeZnAl damping alloy with the entropy of mixing of 9.39 Jmol− 1K− 1 was prepared to study the high-temperature oxidation behaviour. The in-situ XRD analysis indicates that oxidation begins at 673K with the formation of MnO, ZnO, and CuO, follows by the appearance of Mn3O4 and Mn2O3. It is found that the alloy shows improved antioxidation performance by forming continuous Al2O3 film in the substrate near the interface of the oxidation film / matrix, but also shows susceptibility to detachment of oxide scale under high temperatures. It is revealed that there exists the phenomenon of the split of MnO diffraction peaks during the growth process of oxide film, which is proposed to be originated from the MnO produced by either the redox reactions of Mn2O3 and Mn3O4 with Mn or the replacement reaction of MeO (Zn, Cu, Ni, Fe) with Mn.