Abstract
Al2O3/TiAl composites are successfully fabricated by the in-situ hot pressing method from the elemental powders of Ti, Al, TiO2, and V2O5. The effect of V2O5 addition on the microstructure and mechanical properties of the Al2O3/TiAl in-situ composites is investigated in detail. It is found that the as-synthesized composites mainly consist of V-dissolved γ-TiAl, α2-Ti3Al, and Al2O3 particles along with a small amount of V3Al phase, and the in-situ-formed fine Al2O3 particles tend to disperse on the grain boundaries of TiAl matrix. With increasing V2O5 content, the density and Vickers hardness of the resulting composites gradually increase, whereas the fracture toughness and flexural strength first increase and then decrease with the increase of V2O5 content. The composite with 3.5 wt.% V2O5 has the maximum value of 9.35 MPa m1/2 and 713.36 MPa for the fracture toughness and flexural strength, respectively. The toughening mechanism is also discussed in detail.
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