Experiment on Hardness and Impact Strength of Recycled Aluminum Alloys by Metal Casting Process

Abstract

In this present work, the effects of recycled aluminum scraps on the impact and hardness properties and microstructures with a melting process are studied. The method was conducted to determine an impact toughness by Charphy pendulums; hardness materials by Vickers's test; and chemical composition by spectroscopy. Four types of aluminum scraps have been recycled using a metal casting process. They are beverage cans, aluminum profile bar waste, gasoline engine piston, and scrap pans. The results show that the maximum hardness obtained is 54.13 VHN on the material of the gasoline engine piston. The lowest hardness is 26.88 VHN which is obtained for pan aluminum recycle. The highest impact test result is obtained on an aluminum pan material which is 40.3 J/mm2 in average and the lowest value obtained is on the gasoline engine piston material which is 1.7 J/mm2 in average. The microstructure of the gasoline piston shows finer compared to the pans after cast.