Al₂O₃-Ni Composites with High Strength and Fracture Toughness
Al2O3-Ni composites were prepared by the reactive hot pressing of Al and NiO. The composites had a two-phase, interpenetrating microstructure and contained ∼35 vol% Ni. They exhibited an impressively high combination of strength and toughness at room temperature; the four-point bending strength was in excess of 600 MPa with a fracture toughness of more than 12 MPa·m1/2. Examination of fracture surfaces showed that Ni ligaments underwent ductile deformation during fracture. SEM analysis revealed knife-edged Ni ligaments with a limited amount of debonding around their periphery (i.e., at the Ni-Al2O3 interface), indicating a strong Ni-Al2O3 bond.
D. T. Ellerby et al., "Al₂O₃-Ni Composites with High Strength and Fracture Toughness," Journal of the American Ceramic Society, John Wiley & Sons, Jan 2000.
Materials Science and Engineering
United States. Department of Energy
Article - Journal
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