Abstract
The effects of ultrasonic stirring treatment on grain refining and improving the mechanical properties of Al-7wt%Si cast aluminium alloy were systematically investigated in this study. The microstructures and hardness features of the cast ingot specimens were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), optical microscopy (OM), energy dispersive spectrometer (EDS), digital hardness tester, respectively. The investigation was found that the grains of the alloy were obviously refined after ultrasonic treatment. The average grain diameter of Al-7wt%Si alloy ingot was reduced from 395μm to 206μm resulted from the ultrasonic stirring and master alloy elements addition. In contrast, the hardness of the ingot specimen increased from 27HB to 37HB due to the ultrasonic stirring treatment. In fact, the tensile strength of the alloy was also increased because of the grain refinement and the degassing function of the ultrasonic stirring. The observation also revealed that some dispersed gas cavity was agglomerated in the upper part of the alloy ingot.
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