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 0 is introduced by mechanical alloying. Composites have a nearly full density after sintered at 1150 degrees 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. (c) 2006 Elsevier B.V. All rights reserved.