Abstract
This study was undertaken to investigate the effect of different Cu contents (0, 1, 3 and 4.5 wt.%) and solutionising treatment on the microstructure, hardness and wear properties of Al–Mg2Si eutectic alloy after hot extrusion process. Al-13% Mg2Si-X%Cu alloys were extruded at 753 K (480 °C) at an extrusion ratio of 6:1 and ram speed of 10 mm/s. The results showed that increasing Cu content enhances the hardness value of the eutectic alloy and reduces the wear rate of hot-extruded specimens as a result of new Cu-containing intermetallic formation. Solutionising heat treatment was also positive in improving both hardness and wear properties. It was found that solid solution strengthening is the main reason for hardness improvement, whilst abrasion characteristic appears to be governing mechanism for wear behaviour of heat treated Al-13wt.% Mg2Si-4.5 wt.%Cu alloy.
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