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An application of stir casting method for processing of Mg matrix-glassy carbon particles composite

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The need for high-performance and lightweight materials for some demanding applications has led to extensive research work in the development of magnesium matrix composites. The cost-effective processing of composite materials including costs of components and fabrication technologies is an essential element for expanding their applications. The potential applications of magnesium matrix composites in the automotive industry include their use in: disk rotors, piston ring grooves, gears, gearbox bearings, connecting rods, and shift forks [1]. Usually, light metals matrix composites reinforced with ceramic or metallic particles are manufactured by conventional methods as stir casting, squeeze casting, and powder metallurgy. In the case of magnesium matrix composite mainly fabricated through powder metallurgy such systems as SiC/AZ91, TiO2/AZ91, ZrO2/AZ91, SiC/QE22, and B4C/AZ80 have been reported [1]. In a stir casting process, the reinforcing phases in form of particles, short fibers or whiskers are connected with molten metal by mechanical stirring to obtain the suspension of liquid metal-solid reinforcement. The key elements of the technological procedure are proper mechanical stirring conditions as: - type of protective atmosphere during metal melting and suspension preparing, - geometry of the mechanical stirrer, - feeding technique of the solid reinforcement, - velocity and time of stirring, - temperature at each step of procedure. Those parameters are dependent on the chemical composition of the alloy and the characteristics of the particles added. It must be undertaken that no commercial use of stir casting has been reported on any magnesium matrix composites. That technology was applied at laboratory scale, e.g. in magnesium matrix composites with SiC, Al2O3 and TiC particles [2÷4]. In the present work the stir casting technology was proposed for magnesium matrix-glassy carbon particles composites, where the density[...]

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