EBSD characterization of high-temperature phase transformations in an Al-Si coating on Cr-Mo steel

►EBSD can differentiate phases in aluminide layer with similar chemical compositions. ►Mapping and EBSPs functions in EBSD provide a reliable phase identification. ►A phase transformation in the aluminide layer has been described in detail. ►5 Fe-Al-Si and 4 Fe-Al intermetallic phases are performed during the diffusion. ►Cubic τ5(C)-Al7 (Fe,Cr)2Si and hexagonal τ5(H)-Al7(Fe,Cr)2Si are identified.