Abstract
Recent results on the formation of an alumina (Al 2O 3) layer at the matrix-reinforcement interfaces in reactively synthesized NbAl 3Nb composites are presented. The interfacial Al 2O 3 layer was formed in situ via a unique coupling of the surface pre-oxidation of niobium filament reinforcements and reactive synthesis of the matrix from a mixture of the elemental constituents. Details of the processing methodology are presented together with the structural, morphological and compositional characterization of the composites. The in situ Al 2O 3 coating was found to be stable during long-term annealing and acted as an effective barrier to elemental interdiffusion. Composites with the in situ interfacial coating were found to be significantly tougher than the monolithic matrix; the various toughening mechanisms are discussed with special emphasis on the role of the multilayered multiphase interfacial morphology.
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