Interfacial microstructure of Ti3AlC2 and Al2O3 oxide scale

The microstructural characteristics of the Ti3AlC2/Al2O3 interface have been investigated by means of transmission electron microscopy (TEM). The orientation relationships (ORs) between the Ti3AlC2 and the Al2O3 oxide scale are shown to be(0001)Ti3AlC2∥(0001)Al2O3and[112¯0]Ti3AlC2∥[1¯21¯0]Al2O3(OR-1);(0001)Ti3AlC2∥(0001)Al2O3and[112¯0]Ti3AlC2∥[11¯00]Al2O3(OR-2).A high-resolution TEM image of the interface is presented and two interfacial models are proposed based on the observed orientation relationships.