Influence of rice husk ash, Cu, Mg on the mechanical behaviour of Aluminium Matrix hybrid composites

摘要

The present study has been focussed on the feasibility and viability of developing low cost - high performance Al matrix hybrid composites with the use of Rice Husk Ash (RHA), Copper (Cu) and Magnesium (Mg) as reinforcements. The three-weight concentration % (wt.%) of Cu particulates added with 6, 8 and 10wt.% RHA were utilized to prepare the reinforcing phase with Al 6061 alloy as matrix using stir casting method. The 1wt.% of Mg was added to improve the wettability between the Al matrix and reinforcements. The presence of Silicon Dioxide (Silica) is confirmed by X-ray diffraction pattern and EDS spectrum. The effect of reinforcement composition is studied by varying the RHA concentration between 6wt% and 10wt%. It is reported that the tensile strength and hardness of the hybrid composites increased with increasing wt.% of the reinforcing phase (RHA + Cu) while the % Elongation and impact strength decreased with increasing wt.% of RHA in the reinforcing phase. This is because reinforcements are comparatively harder and less ductile than matrix.