The nature of ductile phase toughening in Ni/{alpha}-Al{sub 2}O{sub 3} metal-ceramic composites
- Cornell Univ., Ithaca, NY (United States); and others
Metal-ceramic composites (cermets) combine the advantageous properties of ceramics, namely high temperature stability and creep resistance, with the engineering-friendly traits of metals, such as high fracture toughness and graceful failure. However, optimization of the ductile phase toughening of cermets requires both a precise understanding of the mechanisms involved and the adoption of appropriate models in order to predict the microstructure that would be most effective for a given system. One such system of interest is nickel/alumina. Hence, Ni/{alpha}-Al{sub 2}O{sub 3} composites of varying metal contents and morphologies have been prepared through a number of different in-situ techniques. The fracture toughness of the various composites was determined by performing a work-of-fracture analysis on chevron-notched three-point bend specimens while the composite microstructures were quantitatively characterized using scanning electron microscopy and ASTM standards. Several ductile phase toughening models were examined in order to determine the mechanical mechanisms at work in the cermets and to establish criteria for optimizing their fracture behavior.
- OSTI ID:
- 530694
- Report Number(s):
- CONF-9604124-; CNN: Grant N0014-92-J-1526; Grant F49620-93-1-0235; Grant DMR-9121654; TRN: 97:003389-0030
- Resource Relation:
- Conference: 98. annual meeting of the American Ceramic Society, Indianapolis, IN (United States), 14-17 Apr 1996; Other Information: PBD: 1996; Related Information: Is Part Of Ceramic transactions: Advances in ceramic-matrix composites III. Volume 74; Bansal, N.P.; Singh, J.P. [eds.]; PB: 667 p.
- Country of Publication:
- United States
- Language:
- English
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