Interfacial reactions in Al-Mg (5083)/SiCSp composites during fabrication and remelting
Journal Article
·
· Metallurgical Transactions, A
OSTI ID:131441
- Ecole Polytechnique, Montreal (Canada). Materials Engineering Dept.
- National Polytechnique Institute, st. Martin d`Heres (France)
The interfaces of aluminum alloy composites (5083) reinforced by Sic particles (as-received, oxidized 3.04 wet pct and 14.06 wt pct) were studied. The composites were fabricated by compocasting and certain samples were also melted at 800 C for 30 minutes. The reaction mechanisms between SiCp and liquid Al and between the SiO{sub 2} layer and Al(Mg) are discussed. The crystal boundaries of the MgO (or MgAl{sub 2}O{sub 4}) reaction products are believed to be the diffusion paths (or channels) during the interfacial reactions. A SiO{sub 21} layer, formed by oxidation of the SiC particles prior to their incorporation into the melt, plays an important role in preventing the SiCp from being attacked by the matrix. The interfacial reaction products are affected by both the alloy composition and the thickness of the initial SiO{sub 2} layer.
- OSTI ID:
- 131441
- Journal Information:
- Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 10 Vol. 26; ISSN 0360-2133; ISSN MTTABN
- Country of Publication:
- United States
- Language:
- English
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