Microstructures And Mechanical Properties Of In-Situ Al2o3/Tial Composites By Exothermic Dispersion Method

Abstract

Abstract: In-situ Al2O3/TiAl composites werefabricated by pressure-assisted exothermic dispersion (PAXD) methodfrom elemental powder mixtures of Ti, Al, TiO2, andNb2O5. The microstructures and mechanical properties ofthe as-sintered composites are investigated. The results show thatthe as-sintered products consist of γ-TiAl, α2-Ti3Al, Al2O3, and NbAl3 phases.Microstructure analysis indicates that Al2O3 particlestend to disperse on the grain boundaries. Application of a moderate pressure of 35　MPa at 1200℃ yields Al2O3/TiAlcomposites with fine Al2O3 reinforcement and a　discontinuous network linking by Al2O3 particles. The aluminide component has a fine submicron γ+α2lamellar microstructure. With increasing Nb2O5 content,Al2O3 particles are dispersed uniformly in the matrix. The hardness of the composites increases gradually, and the bending　strength and fracture toughness of the composites reach to the　maximum value, respectively.

Key words: Al2O3/TiAlcomposites, Microstructure

T.T.Ai. Microstructures And Mechanical Properties Of In-Situ Al2o3/Tial Composites By Exothermic Dispersion Method[J]. Acta Metallurgica Sinica (English Letters), 2008, 21(6): 437-443 .

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Microstructures And Mechanical Properties Of In-Situ Al2o3/Tial Composites By Exothermic Dispersion Method

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