Effects of Rare-Earth Oxides Doping on Microstructures and Properties of Al2O3/TiAl Composites

Fen Wang; Xiao Feng Wang; Jian Feng Zhu; Liu Yi Xiang

doi:10.4028/www.scientific.net/MSF.675-677.143

Paper Titles

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Effects of Rare-Earth Oxides Doping on Microstructures and Properties of Al₂O₃/TiAl Composites

Abstract:

Effects of rare-earth oxides addition (0.38~1.52 mol% of Sm2O3, Eu2O3 and Er2O3) on the property and microstructure of the hot-pressed (1300°C, 2h, 35 MPa) Al2O3 (12 wt %)/TiAl insitu composites have been investigated. The results show that the doping of rare-earth oxides has a positive effect on both mechanical properties and densities of Al2O3/TiAl composites. Densities enhanced with increasing of rare-earth oxides. The flexural strength and fracture toughness were higher than other samples when the rare-earth oxide content was 0.38 mol %. The matrix grains and Al2O3 particles were significantly refined, and Al2O3 particles evenly distributed in the matrix.