Fabrication and mechanical properties of Al2O3/TiAl composites

Taotao Ai

doi:10.1007/s11595-009-5732-y

Journal of Wuhan University of Technology Materials Science Edition ›› 2009, Vol. 24 ›› Issue (5) : 732 -735. DOI: 10.1007/s11595-009-5732-y

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Fabrication and mechanical properties of Al₂O₃/TiAl composites

Taotao Ai ¹^,^{^a}

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Abstract

Al₂O₃/TiAl composites were successfully fabricated by hot-press-assisted exothermic dispersion method with elemental powder mixtures of Ti, Al TiO₂ and Nb₂O₅, and the microstructure and mechanical properties were investigated. The results indicate the fine Al₂O₃ particles tend to disperse on the grain boundaries. The grain size of TiAl matrix decreases and the hardness increases with increasing Nb₂O₅ content. The bending strength and fracture toughness reach to a maximum when Nb₂O₅ content is 6 wt%, under 642 MPa and 6.69 MPa·m^1/2, respectively. Based on the fractography and the observation of crack propagation path, it is concluded that the strengthening and toughening of such composites at room temperature can be attributed to the refinement of the TiAl matrix, the deflection behavior in the crack propagation and the dispersion of Al₂O₃ particles.

Keywords

Al₂O₃/TiAl composites / microstructure / mechanical properties

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Taotao Ai. Fabrication and mechanical properties of Al₂O₃/TiAl composites. Journal of Wuhan University of Technology Materials Science Edition, 2009, 24(5): 732-735 DOI:10.1007/s11595-009-5732-y

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