Comparative study of Al - 10 wt.% Zn alloy processed through As-cast and Centrifugal Casting.

Abstract

Al-10 wt% Zn alloy was As-cast and centrifugal casted, the comparative study of mechanical, microstructure and tribilogical properties where found. The chemical composition in Spark Optical Emission Spectrometer founds that Al-10 wt% Zn as 90.83% ± 0.0745% of Aluminum and 8.68 % ± 0.0747% of Zinc. Density of the Al-10 wt% Zn alloy increase in centrifugal increased by 0.8 % then the as cast. The hardness of alloy in centrifugal is 45.7± 2.6  HV1 wile in the As cast is 43.5 ± 4.7 HV1. Due to centrifugal force in centrifugal casting the grain size and porosity percentage is lower to the as cast, is found in the optical microscope, the ultimate tensile strength of alloy in as cast is 165.24 ± 19.39 MPa and in the centrifugal cast is 177.01 ± 4.213 MPa. The SEM images gives the microstructural abnormalities that might contribute to the failure and EDX provided the fully characterize elemental composition of alloy. X-ray diffraction technique is used for qualitative analysis of phases in Al-10 wt% Zn alloy for intermetallics formed during As-cast and Centrifugal Casting. The wear rate of the alloy in as cast is 300 µg/Nm while in centrifugal casting is 250 µg/N  in 20N lad, speed of 800rpm and disc diameter of 130mm. wear rate in centrifugal casting is lower than the as cast.