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Improved Mechanical Properties of Al-Si Alloys by Adding an Extrusion Process to Conventional Processing Method

Han J. Y., Femi O. E., Kilicaslan F., Jeong C. U., Baeg C. H., Hong S. J., Koo J. M.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 2B

1179--1183

In this study, the mechanical properties of Al-Si alloys was improved by selecting higher Si content and avoiding distortion in Al-Si matrix by adding an extrusion process such that the fabrication processes casting and extrusion were in sequence. Cast billets were extruded at ratios 4:1 and 10:1 to obtained two extruded bars with different processing parameters. The as-extruded samples were characterized and investigated for microstructure and mechanical properties. Optical Microscope was used to examined phase morphologies and microstructures of the extruded Al-Si bars. Mechanical properties were conducted on each sample to study the effectiveness of the additional extrusion process in high Si content Al-Si alloys. The result shows that by increasing the extrusion ratio, the size of the primary Si particle reduces leading to a higher density, better tensile and yield strength compared to the cast billet.