Interfacial reactions in aluminosilicate short fiber-reinforced aluminum matrix composites |
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Authors: | T. P. D. Rajan R. M. Pillai B. C. Pai |
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Affiliation: | (1) the Metal Processing Division, Regional Research Laboratory (CSIR), 695 019 Thruvanthapuram, India |
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Abstract: | Aluminosilicate short fibers are one of the less expensive reinforcements used for the fabrication of metal matrix composites (MMCs). The present investigation evaluates the interfacial characteristics of Al-7Si-0.4Mg (356) alloy reinforced with 10 wt pct aluminosilicate short fibers using optical microscopy, electron microscopy, and X-ray analysis. The fibers used are standard- and zirconiagrade aluminosilicate short fibers. The interfacial analysis has shown the formation of MgAl2O4 and Si in both grades of fibers. In addition, ZrAl3 formation is observed in the zirconia-grade fiber because of the interaction between the matrix and the dispersoid. The zirconia-grade fiber is more susceptible to interfacial reaction than the standard-grade fiber because of the presence of the highly reactive ZrO2 phase and a lower amount of the Al2O3 phase, which provides resistance to the reaction. |
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