A Numerical Formula for General Prediction of Interface Bonding between Alumina and Aluminum-Containing Alloys

Figure 2

Schematic diagram of interface energy and preferred interface termination as a function of (chemical potential of Al) for M with intermetallic compound (MAl) and oxides (MO) formation taken into account. On the left side of the border A, Al₂O₃ reduces to Al metal. On the right side of the border B, the interface is not Al₂O₃/M (pure metal) but Al₂O₃/ (metal oxide). When is larger than that at the border B, the interface is O-terminated. If mixed oxide phase MAlO exists, the border C appears in the figure and the interface with alumina would be Al₂O₃/ instead of Al₂O₃/.