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

✍ Scribed by Jie Meng; Chengchang Jia; Qing He

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 1003 KB
• Volume: 434
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.06.075

✦ Synopsis

Oxide-dispersion-strengthened Ni 3 Al 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 Ni 3 Al composites exhibit high bending strength (about 2450 MPa) due to results of uniformly dispersion of the oxide and the refinement of the grain size.