Fabrication of oxide-reinforced Ni3Al composites by mechanical alloying and spark plasma sintering

Oxide-dispersion-strengthened Ni3Al composites have been fabricated by mechanical alloying and subsequently spark plasma sintering with elemental powder. A solution Ni(Al) has been obtained during mechanical alloying. In addition, element O is introduced by mechanical alloying. Composites have a nearly full density after sintered at 1150 °C for 5 min under the pressure of 40 MPa. About 3 vol.% oxides disperse in the matrix uniformly. The average size of oxide is about 50 nm. Oxide-dispersion-strengthened Ni3Al composites exhibit high bending strength (about 2450 MPa) due to results of uniformly dispersion of the oxide and the refinement of the grain size.