SiC_p/Mg Composites Made by Low-Energy Mechanical Processing

Author： Huard G. Angers R. Krishnadev M.R. Tremblay R. Dubé D.

ISSN： 0008-4433

Source： Canadian Metallurgical Quarterly, Vol.38, Iss.3, 1999-07, pp. : 193-200

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Abstract

Composite powders containing 10, 20 and 30 vol% SiC_p particulates in a Mg matrix were produced using mechanical processing. A small laboratory ball mill was used to achieve a uniform distribution of the reinforcements in the Mg matrix. The particle size distribution and the microstructure of the composite powders were studied as a function of processing time. Based on these observations, four successive stages of processing were identified. It was shown that a homogeneous distribution of SiC in a Mg matrix may be obtained under low-energy milling conditions. The influence of milling time and concentration of SiC_p on tensile strength, stiffness, elongation and impact properties of rods extruded from the resulting composite powders were investigated. The hardness of SiC_p/Mg composites was also evaluated to determine the influence of SiC_p content. © 1999 Canadian Institute of Mining and Metallurgy. Published by Elsevier Science Ltd. All rights reserved.RésuméDes poudres composites SiC_p/Mg contenant 10, 20 et 30% vol. de particules fines de SiC_p ont été elaborées en utilisant un broyeur à faible énergie. La distribution granulométrique et la microstructure des particules composites ont été examinées en fonction du temps de broyage. Cette méthode de fabrication a permis de degager quatre étapes principales d'agglomération de la poudre conduisant à une dispersion trè s homogéne des renforts. Des tiges composites ont été produites par extrusion de la poudre SiC_p/Mg, et la resistance en traction, la rigidite, l'allongement ainsi que la ténacité de ces com posites ont été evaluées en fonction de la concentration de renforts et du temps de broyage. La dureté des tiges composites a aussi été mesuree afin d'evaluer l'influence de la concentration des renforts. © 1999 Canadian Institute of Mining and Metallurgy. Published by Elsevier Science Ltd. All rights reserved.