Abstract
In the present work, the Al/Mg bimetallic composites were produced using lost foam casting (LFC) process, and the effects of the pouring temperature on the microstructure, mechanical properties, and fracture behavior of the Al/Mg bimetallic composites produced by the LFC process were investigated in order to obtain an optimized bonding between aluminum alloy and magnesium alloy. It was found that the pouring temperature had a significant effect on the interface between the aluminum and the magnesium. With increasing pouring temperature, the thickness of the interface layer obviously increased. When the pouring temperature was 730 °C, a compact and uniform interface layer was obtained between the aluminum and the magnesium. The interface layers of the Al/Mg bimetallic composites obtained with different pouring temperatures primarily consisted of three different reaction layers, namely Al12Mg17 + δ-Mg eutectic, Al12Mg17 + Mg2Si, and Al3Mg2 + Mg2Si. The interface layers of the Al/Mg bimetallic composites with different pouring temperatures had higher microhardnesses compared to the base metals. The Al/Mg bimetallic composite with the pouring temperature of 730 °C obtained a maximum shear strength due to its superior interface, showing an optimized bonding between the aluminum and the magnesium. The SEM fractograph of the bimetallic composite mostly exhibited a brittle fracture morphology, and the Al12Mg17 + δ-Mg eutectic partly generated a plastic deformation.
Published Version
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