Characterization of Semi Amorphous Phase of Rice Husk Silica Reinforced AA7075 Aluminium Chips Based Matrix

Abstract

AbstractDirect conversion process of recycling aluminium chip has recently been applied without the melting process to avoid the disadvantages of present method. Excellent recycling processes need to be focused to expand the contribution of aluminium to the industry. Aluminium recycling saves energy, which benefits both current and future generations. Aluminium matrix composite (AMC) is aluminium produced by the addition of reinforcement that beneficial to improve its physical and mechanical behaviors. Rice husk ash is a potential source of reactive silica in amorphous phase since it is produced through the combustion of rice husk. The AMC was produced using an AA7075 aluminium chip and varying amounts of semi-amorphous rice husk silica (2.5–12.5%) particles with the method of cold compaction. The effect of physical and mechanical properties of semi amorphous rice husk silica reinforced aluminium chip AA7075 was investigated. The highest density value was 2.31 g/cm2 at 10 wt% of rice husk silica, while porosity and water absorption were similar. The best composition for hardness is 10 wt% at 68.33 Hv which increased 55.4% from fully aluminium chips specimen. The highest compression strength is 312.63 MPa at 7.5 wt% of rice husk silica. The increasing value of compression strength is 6.68% from fully aluminium chips specimen.KeywordsAluminium matrix compositeRice Husk SilicaSemi amorphous phase