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Lattice Continuity at Interface of Alumina-Coated Transition Metals

Interfaces of alumina-coated transition metals were studied by cross-sectional high-resolution electron microscopy (HREM) to investigate the lattice continuity across the interface. α-alumina films 2-3 µ m in thickness were coated on vanadium, niobium and tantalum polycrystals by the sputtering method. Cross-sectional HREM observations showed that there was a three-dimensional orientation relationship (3-D OR) between α-alumina films and substrate transition metals. The 3-D OR is discussed based on the coincidence of reciprocal lattice points of two adjoining crystals.