Title

Al₂O₃-Ni Composites with High Strength and Fracture Toughness

Abstract

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.

Department(s)

Materials Science and Engineering

Sponsor(s)

United States. Department of Energy

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2000 John Wiley & Sons, All rights reserved.

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