Studi Eksperimental pengaruh Variasi Komposisi terhadap Sifat Mekanik dan Mikrostruktur pada Pembuatan Cylinder Liner Alumunium A319-Si- Cu menggunakan Metode Horizontal Centrifugal Casting

Abstract

Aluminum Aluminum alloy is a metal alloy with aluminum as the main metal element. Aluminum - copper alloys will produce properties that are hard and strong, but brittle. This research aims to determine the effect of Cu (copper) composition on the mechanical properties of hardness, wear, microstructure of various Cu variations in the manufacture of cylinder liner products. The specimen was made by mixing aluminum alloy A319, Si 12% (wt) and Cu with a composition of 8%, 10% and 12% (wt) Cu respectively, melted to a temperature of 800 ºC using a horizontal centrifugal casting process. The mixture of aluminum, silicon and Cu is poured into a mold that has been heat treated to 200ºC and is rotating. The resulting product is formed into a specimen that corresponds to each test for brinnel hardness, wear (pin on disk), and surface as observed with a scanning electron microscope. In the tests, the results showed that there was an increase in the hardness value and wear level along with the increase in Cu composition. The results of the highest hardness value and lowest wear rate were 12% Cu composition with a hardness value of 147.9 BHN and 0.00215 gr/s. The surface analysis observed shows that the amount of surface friction decreases with increasing levels of added Cu.