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Type: Artigo de periódico
Title: Aluminium Matrix Composites Reinforced with Co-continuous Interlaced Phases Aluminium-alumina Needles
Author: Gregolin, Elvio de Napole
Goldenstein, Hélio
Gonçalves, Maria do Carmo
Santos, Rezende Gomes dos
Abstract: An Al-5SiO2 (5 wt% of SiO2) aluminium matrix fiber composite was produced where the reinforcement consists of fossil silica fibers needles. After being heat-treated at 600 °C, the original fiber morphology was retained but its microstructure changed from solid silica to an interconnected (Al-Si)/Al2O3 interlaced structure named co-continuous composite. A technique of powder metallurgy, using commercial aluminium powder and the silica fibers as starting materials, followed by hot extrusion, was used to produce the composite. The co-continuous microstructure was obtained partially or totally on the fibers as a result of the reaction, which occurs during the heat treatment, first by solid diffusion and finally by the liquid Al-Si in local equilibrium, formed with the silicon released by reaction. The internal structure of the fibers was characterized using field emission electron microscope (FEG-SEM) and optical microscopy on polished and fractured samples.
Subject: co-continuous structure
silica needles
metal matrix composite
Editor: ABM, ABC, ABPol
Rights: aberto
Identifier DOI: 10.1590/S1516-14392002000300019
Date Issue: 1-Sep-2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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