Microstructure and Mechanical Properties of Al2O3/Tial In Situ Composites Doped with Cr2O3

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

doi:10.4028/www.scientific.net/AMR.194-196.1736

Paper Titles

Microstructure and Mechanical Property of an ECAP Processed Al-Mg₂Si In Situ Composite by Using a Combined Route
p.1720

Improvement in the Thermal Shock Resistance of Zirconia Ceramic by the Addition of Aluminium Titanate
p.1724

Mechanical and Tribological Properties of PTFE Composites Filled with POB
p.1728

Effect of Sintering Temperature on Al₂O₃/TiAl Composite from Ti-Al-TiO₂-Eu₂O₃ System
p.1732

Microstructure and Mechanical Properties of Al₂O₃/Tial In Situ Composites Doped with Cr₂O₃
p.1736

Tensile Property of the Flax/Polyester Composites after Water Treatment
p.1740

Effect of Molar Ratio of Al₂O₃ to Fe₂O₃ on the Sintering and Thermal Shock Resistance of Al₂O₃-Fe₂O₃ Composite
p.1745

Preparation and Characterisation of Polyborazine as Novel Precursor to Boron Nitride Ceramic
p.1749

Effect of Sintering Temperatures on the Sintering Performance and Thermal Shock Resistance of MgO-Al₂O₃-Fe₂O₃ Composite
p.1755

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Microstructure and Mechanical Properties of Al₂O₃/Tial In Situ Composites Doped with Cr₂O₃

Abstract:

Al₂O₃/TiAl composites were successfully fabricated by hot-press-assisted exothermic dispersion method with elemental powder mixtures of Ti, Al, TiO₂ and Cr₂O₃. The effect of Cr₂O₃ addition on the microstructures and mechanical properties of Al₂O₃/TiAl composites has been characterized. The results show that the Rockwell hardness, flexural strength and fracture toughness of the composites increase with increasing Cr₂O₃ content. When the Cr₂O₃ content is 3.5 wt %, the flexural strength and the fracture toughness reach the maximum value of 658.7 MPa and 7.2 MPa•m^1/2, respectively. The improvement of mechanical properties is firstly associated with a more homogeneous and finer microstructure developed by addition of Cr₂O₃; secondly, it is related to the increase of the ratio of α₂-Ti₃Al/γ- TiAl matrix phases.