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In this work, fabrication and characterization of aluminum gradient composites reinforced by nano-particles of tungsten carbide via the centrifugal casting method were studied. In order to prepare a mixture of aluminum and tungsten carbide powders, a high energy planetary ball mill was used. The master-alloy was added to A356 aluminum matrix by horizontal centrifugal casting at different rotation speeds to synthesize Al-5 wt.% WC. The results of X-ray diffraction and scanning electron microscopy analysis confirmed a homogeneous powder in nanometer scale through mechanical milling. Centrifugal casting at speeds of up to 1300 RPM is a suitable method for production of Al–WC gradient nano-composites. By increasing the rotation speed, reinforcement phases are transmitted into the outer layers of cast samples. An agglomeration of hard WC phase leads to improvement of surface hardness and wear resistance.

Fabrication of Al–WC gradient nano-composite via centrifugal casting method