The present work aims on the fabrication of Al-Cu-Ni-Y alloy and characterization of percentage ofCu and Ni alloying element in Al-Cu-Ni-Y alloys casting sample by using casting technique. The casting technique is the economical method to investigate the effect of percentage of Copper element and Nickel element in AI-Cu-Ni-Y alloy casting sample. The fabrication of AI-Cu-Ni-Y alloy was carried out by selecting the Aluminum matrix percentage of 86%, Yttrium of 6%, Copper percentage within I% - 8% and Nickel percentage within I% - 8%. The establishment of the composition Al-Cu-Ni-y will be melted in the furnace and poured in the copper mold. The cast ingot will be characterize by different test to determine the suitable composition of AI-Cu-Ni-y that relate to physical & mechanical properties, microstructural analysis together with corrosion behaviour. The selected tests were XRD analysis, SEM analysis, Tafel Extrapolation analysis, Compression test and Vickers Hardness test. The crystalline phase did exist in the Al-Cu-Ni-Y in the XRD analysis. Secondly, the microstructural analysis shows the intermetallic of interdendritic phase in all the composition. The addition ofNickel reveals the columnar structure in the intermetallic phase. The Vickers microhardness test shows the sample of AI86-Ni5-Cu3-Y6 have the highest hardness value which is 51.36 HV. The highest Polarization Resistance, Rp from the electrochemical testing was AI86-Ni5-Cu3-Y6 which is 20 131.82k.n meanwhile the
lowest corrosion rate, 0.00380 mm per year.
