| Autor: | J. L. Baldonedo, L. Gil, P. Rodrigo, A. Ureiña, M.D. Escalera |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Materials science
Mechanical Engineering Whiskers Aluminium carbide Metallurgy Oxide chemistry.chemical_element Microstructure Casting chemistry.chemical_compound chemistry Mechanics of Materials Aluminium Whisker visual_art Aluminium alloy visual_art.visual_art_medium General Materials Science Composite material |
| Zdroj: | Journal of Materials Science. 36:419-428 |
| ISSN: | 0022-2461 |
| DOI: | 10.1023/a:1004880629720 |
| Popis: | The interfacial reactions in an aluminium alloy composite (AA2009) reinforced with 15% volume of SiC whiskers were studied. The composite was subjected to a simulated casting process to analyse its response under different melting conditions. The different reaction mechanisms between the SiC whiskers and both the molten aluminium and their alloying elements (Cu, Mg, and Fe) are discussed. The high aspect ratio (l/d) of the reinforcement is the main microstructural factor, which controls both reactivity and wettability between the molten matrix and the SiC. Tested specimens showed very great Si-enrichment of the matrix around SiCw which produced an isothermal solidification and stopped the interfacial reactions. Formation of binary aluminium carbide (Al4C3) during the melting cycles was also detected, especially for temperatures higher than 800 °C, produced by a dissolution-precipitation mechanism. Nucleation of the Al4C3 crystal was favoured both on the lateral whisker surfaces and on oxide particles (Al2O3, MgO) present in the aluminium matrix. Transmission Electron Microscopy and Electron Diffraction (TEM-ED) studies made it possible to identify both the nature and the structure of the different interfacial products generated during casting. |
| Databáze: | OpenAIRE |
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