Abstract
In this study, powder Al70(CrMgNi)30 medium entropy alloy (MEA) was mixed with powder aluminium-7068 (AA-7068) at 0, 5, 10, and 15wt. % to improve its mechanical performance. The powders were blended in a tubular mixer at 110 rev/min for 8hours, compacted at 50MPa for 10mins and vacuum sintered at 550 ˚C. The sintered composites were evaluated, and the outcome indicated that 5 and 10wt.% MEA diffused more in the AA-7068 matrix; however, 15wt.% MEA exhibited particle clusters combined with decreasing grain size. The addition of 5 and 10wt. % MEA reduces the porosity, while 15wt. % MEA increases porosity somewhat. Conclusively, 0 to 15wt. % MEA increased density, hardness, and elastic modulus but linearly decreased elongation of AA-7068 alloy. 0 – 10wt.% MEA improved yield and ultimate tensile strengths, fracture toughness, and impact strength; however, adding 15wt.% MEA led to a minor decrease in strength. The obtained wear rate of the composites declined with a proportional rise in MEA dosage, though it increases with applied load. Thus, the MEA dose of 10% results in a beneficial overall improvement in the AA-7068 alloy compared to other percentage reinforcements.
Published Version
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