In-situ synthesis of Al{sub 2}O{sub 3} and TiB{sub 2} particulate mixture reinforced aluminium matrix composites
- Katholieke Univ. Leuven, Heverlee (Belgium). Dept. of Metallurgy and Materials Engineering
Among the numerous methods of producing discontinuously reinforced metal-matrix composites, technologies allowing in-situ production of the reinforcing phase offer significant advantages from a technical and economic standpoint. Aluminum-alumina particulate composites are materials of recent interest for their improved mechanical properties as compared to the unreinforced alloys. Along with other techniques, in-situ preparations of the composites by a reaction between TiO{sub 2} (rutile type) and molten aluminium have been investigated. Research of the Al-Ti-B system has indicated, TiB{sub 2} will be the only intermetallic phase formed if Ti and B are at a ratio corresponding to that of stoichiometric TiB{sub 2}. TiB{sub 2}, as reported, is a very effective reinforcement as far as the strengthening effect is concerned. Therefore, in the present study, a proper amount of B is incorporated into an Al-rich TiO{sub 2}-Al system in order to produce Al{sub 2}O{sub 3} and TiB{sub 2} mixture reinforced Al matrix composites, eliminating the brittle Al{sub 3}Ti formation. The synthesized porous materials, (Al{sub 2}O{sub 3} + TiB{sub 2})-Al, could serve as excellent master alloys for subsequent dilution in aluminium and processing of aluminium matrix composites reinforced with Al{sub 2}O{sub 3} and TiB{sub 2} particulates. This provides a novel low-cost in-situ route for preparing this type of useful composites.
- OSTI ID:
- 438631
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 4 Vol. 36; ISSN 1359-6462; ISSN SCMAF7
- Country of Publication:
- United States
- Language:
- English
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