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Influence of cowpat ash particles on micro structure,mechanical and tribological properties of Al 7075 composites

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In the current study the effects of reinforcing cowpat ash (CPA) in aluminium 7075 alloy are briefly reported. CPA wasreinforced in varying the weight percentage by 3, 6 and 9 using double stir casting technique. The effects of CPA particles areanalysed and compared with base material through physical and tribological behaviours. Bonding and distribution of CPAparticles were examined by optical microscope and scanning electron microscope. Mechanical and tribological properties wascarried out in produced samples. The micro structural images disclosed that the CPA particles were uniformly distributed inthe aluminium matrix. The fabricated composite materials density was decreasing while increasing CPA particles, but on theother hand the porosity was increasing. The ultimate tensile strength and hardness of samples increased up to 6% of CPAreinforcement and extra addition in particles has reduced their strength. The base alloy exhibited better impact strength thanthe composite material. Maximum decrease in wear rate was attained at 6% CPA reinforcement. The fracture SEM imagesexhibited cracks, voids, dimples for tensile and impact specimens and micro cuttings, micro ploughing in the worn-out surface. The corrosion rate decreased with increase in CPA particles.

Abstract

In the current study the effects of reinforcing cowpat ash (CPA) in aluminium 7075 alloy are briefly reported. CPA wasreinforced in varying the weight percentage by 3, 6 and 9 using double stir casting technique. The effects of CPA particles areanalysed and compared with base material through physical and tribological behaviours. Bonding and distribution of CPAparticles were examined by optical microscope and scanning electron microscope. Mechanical and tribological properties wascarried out in produced samples. The micro structural images disclosed that the CPA particles were uniformly distributed inthe aluminium matrix. The fabricated composite materials density was decreasing while increasing CPA particles, but on theother hand the porosity was increasing. The ultimate tensile strength and hardness of samples increased up to 6% of CPAreinforcement and extra addition in particles has reduced their strength. The base alloy exhibited better impact strength thanthe composite material. Maximum decrease in wear rate was attained at 6% CPA reinforcement. The fracture SEM imagesexhibited cracks, voids, dimples for tensile and impact specimens and micro cuttings, micro ploughing in the worn-out surface. The corrosion rate decreased with increase in CPA particles.

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