Analysis of Granules and Hardness on Metal Alloys 77 % Cu 23 % Zn

Sri Wuryanti

Abstract: This analysis is designed to observe sum, hardness, and number of grains. Grain refinement is one solution to reducing damage caused by heating. The sample of alloys, Cu 77% - Zn 23%, 50 mm in diameter, was analyzed using Optic Microscope and Buehler Micro Hardness. Experiments suggest the amount of grain is 5824 grains/mm2, large number of grain (ASTM G), 9.558, and mean hardness, 123.506 HV.

Keywords: Alloy, Cooper, Grain, Micro hardness, Optic microscope, Zinc