physica status solidi (a) · 1998 · 19 citations · 15 references
Natural SciencesMaterials EngineeringMaterials ScienceMaterials CharacterizationMetallic MaterialsMetallurgyAlloysAluminum OxidesGrain Structure AnalysisGrain Structure FormationMicrostructure AnalysisMicrostructure EvolutionAluminaAluminum-containing AlloysGrain BoundariesLattice ParametersTernary Phase DiagramsTernary Phase EquilibriaX-ray Diffraction AnalysisX-ray Diffraction Phase Analysis
The microstructure of an alumina aluminide alloy prepared by infiltration of a Nb2O5 containing precursor with liquid Al was studied. X-ray diffraction analysis shows that Al2O3, Al3Nb and AlNb2 have formed. Scanning electron microscopy and transmission electron microscopy reveal a dense and fine grained intermetallic reinforced alumina composite consisting of Al2O3, Al3Nb and AlNb2 grains, which is in accordance with the ternary phase diagram. Additionally, nanometer sized inclusions of AlNb2 form in the Al2O3 and Al3Nb grains and at grain boundaries. While the particles are assumed to precipitate in Al3Nb, an occlusion mechanism is considered for the AlNb2 particles located in Al2O3 grains. Furthermore, a change in lattice parameters was observed for the AlNb2 phase.
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Atomic structure of epitaxial Nb-Al<sub>2</sub>O<sub>3</sub>interfaces I. Coherent regions
G. Gutekunst, Joachim Mayer, M. Rühle · Philosophical magazine. A/Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties · 1997 · 90 citations
Natural Sciences, Materials Engineering, Materials Science +17
Atomic structure of epitaxial Nb-Al<sub>2</sub>O<sub>3</sub>interfaces II. Misfit dislocations
G. Gutekunst, Joachim Mayer, V. Vítek et al. · Philosophical magazine. A/Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties · 1997 · 82 citations
Natural Sciences, Materials Engineering, Materials Science +17