Effect of Melt Overheating on Structure and Mechanical Properties of Al-Mg-Si Cast Alloy

The paper discusses the complex effect of melt overheating with subsequent fast cooling down to pouring temperature on crystallization process, microstructure and mechanical properties Al-Mg-Si aluminum alloy. results obtained facilitated establishment rational modes overheating, leading a significant change in dispersion morphology structural components. In particular, an increase 900 °C holding rapid casting temperature, decrease average size dendritic cells solid solution from 39 ?m 13 was observed. We also noticed refinement eutectic inclusions Mg2Si phase compact morphology. An increased level noted; maximum values tensile strength elongation reached 228 MPa 5.24%, respectively, which exceeded initial by 22.5% 52.3%, correspondingly. microhardness sequentially 38.21 56.5 HV during overheating. According EDS linear scanning, superheat is accompanied degree saturation magnesium.