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Processing and Mechanical Properties of Al2O3/Ni3Al Composites with Interpenetrating Network Microstructure

Skirl, Siegfried and Krause, Ralph and Wiederhorn, Sheldon M. and Rödel, Jürgen (2001):
Processing and Mechanical Properties of Al2O3/Ni3Al Composites with Interpenetrating Network Microstructure.
In: Journal of the American Ceramic Society, AMER CERAMIC SOC, 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 USA, pp. 2034-2040, 84, (9), ISSN 0002-7820, [Article]

Abstract

Composites with microstructures of interpenetrating networks were manufactured by gas pressure infiltration of Ni3Al into porous preforms of aluminum oxide. Composites with Ni-3,Al contents of between 15% and 30% by volume were made and evaluated mechanically at temperatures between room temperature and 1000 degreesC. The fracture strength, the fracture toughness, Young's modulus, and the thermal expansion coefficient were measured for each composite and test condition and were correlated with the microstructures of the composites. Composites with low Ni3Al contents had strengths below 400 Wa, presumably due to microcracking along the interface between the Ni3Al and the Al2O3. The composite with the highest content of Ni3Al, 30 vol%, had a mean fracture strength of 675 +/- 16 MPa, a Weibull modulus of 23.9, and a room-temperature toughness of 9.2 +/- 0.5 MPa(.)m(1/2).

Item Type: Article
Erschienen: 2001
Creators: Skirl, Siegfried and Krause, Ralph and Wiederhorn, Sheldon M. and Rödel, Jürgen
Title: Processing and Mechanical Properties of Al2O3/Ni3Al Composites with Interpenetrating Network Microstructure
Language: English
Abstract:

Composites with microstructures of interpenetrating networks were manufactured by gas pressure infiltration of Ni3Al into porous preforms of aluminum oxide. Composites with Ni-3,Al contents of between 15% and 30% by volume were made and evaluated mechanically at temperatures between room temperature and 1000 degreesC. The fracture strength, the fracture toughness, Young's modulus, and the thermal expansion coefficient were measured for each composite and test condition and were correlated with the microstructures of the composites. Composites with low Ni3Al contents had strengths below 400 Wa, presumably due to microcracking along the interface between the Ni3Al and the Al2O3. The composite with the highest content of Ni3Al, 30 vol%, had a mean fracture strength of 675 +/- 16 MPa, a Weibull modulus of 23.9, and a room-temperature toughness of 9.2 +/- 0.5 MPa(.)m(1/2).

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 84
Number: 9
Publisher: AMER CERAMIC SOC, 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 USA
Uncontrolled Keywords: ADVANCED STRUCTURAL CERAMICS; INTERMETALLIC COMPOUNDS; AL2O3/AL COMPOSITES; MELT-INFILTRATION; BEHAVIOR; STRENGTH; FRACTURE; NI3AL; COMMERCIALIZATION; OXIDATION
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 14 Jul 2011 10:32
Identification Number: 472BF
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