Abstract
High resolution electron microscopy (HREM) studies are, in principle, capable of determining the atomic structure of defects, such as interfaces,in crystalline materials. A quantitative evaluation of the defect structure requires, however, that the examined specimen fulfills certain conditions, e.g. low-indexed zone axes of both materials adjacent to the interface must be parallel to each other and to the electron beam. Well defined geometrical characteristics exist between a metallic matrix and oxide precipitates formed by internal oxidation of a metallic alloy.Results will be reported on structure and defects at Nb/Al2O3 interfaces formed by internal oxidation of a Nb-2.9 at % Al alloy (oxidation conditions: 30 min. at 1820 K, po2 ∽6.10-5mbar). In addition, information on growth mechanisms of the Al2O3 precipitate can be extracted from the HREM studies. An extended paper of the research will be published separately.Most Al2O3 precipitates possess a plate-like shape with dimension of (200...600) x (200...600) x (10...40) nm3.
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