Fabrication and mechanical properties of Al2O3/TiAl in situ composites doped with Nb2O5 | Zendy

F. Wang | Zendy; Ningxia Fan | Zendy; Jian Zhu | Zendy; Hong Jiang | Zendy

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Fabrication and mechanical properties of Al2O3/TiAl in situ composites doped with Nb2O5

Author(s) -

F. Wang,

Ningxia Fan,

Jian Zhu,

Hong Jiang

Publication year - 2015

Publication title -

science of sintering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.309

H-Index - 25

eISSN - 1820-7413

pISSN - 0350-820X

DOI - 10.2298/sos1503311w

Subject(s) - materials science , flexural strength , composite material , microstructure , fracture toughness , fabrication , exothermic reaction , dispersion (optics) , doping , vickers hardness test , medicine , chemistry , alternative medicine , physics , optoelectronics , organic chemistry , pathology , optics

Al2O3/TiAl composites were successfully fabricated from powder mixtures of Ti, Al, TiO2, Cr2O3 and Nb2O5 by a hot-press-assisted exothermic dispersion method. The effect of the Cr2O3 and Nb2O5 addition on the microstructures and mechanical properties of Al2O3/TiAl composites was characterized. The results showed that the specimens are mainly composed of TiAl, Ti3Al, Al2O3, NbAl3 and Cr2Al. The Vicker-hardness and density of Al2O3/TiAl composites increase gradually with the increase of Nb2O5 content. When the Nb2O5 content was 6.54 wt %, the flexural strength and fracture toughness of the composites have a maximum values of 789.79 MPa and 9.69 MPa•m1/2, respectively. The improvement of mechanical properties is discussed in detail

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