Abstract
The microstructures and mechanical properties of T5 heat-treated Al - 5.0 wt % Cu - 0.6 wt % Mn alloys with different Fe content prepared by squeeze casting were studied by tensile test, optical microscopy (OM), scanning electron microscope (SEM) and electron probe micro-analyzer (EPMA). The results showed that the dominate Fe-rich intermetallics are α (CuFe) with a few Al3(FeMn),Al6(FeMn), and α-Fe in the alloys depending on different Fe content. With the increasing Fe content continually, the ultimate tensile strength and elongation of the alloys decreased gradually. This is attributed to the increasing amount of Fe-rich intermetallics, the decrease of precipitation particles in α (Al) matrix and the increase of α (Al) dendrite size. The elongation level of 13.7% was still obtained in the squeeze cast alloy even when the Fe content was as high as 1.5%.
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