Microstructural study and differential scanning alorimetry analysis at elevated temperatures of uperheated as-cast A357 alloy
Mazlee, Mohd Noor
Shamsul, Baharin Jamaludin, Prof. Dr.
Kamarudin, Hussin, Brig. Jen. Dato' Prof. Dr.
Shaiful Rizam, Shamsudin
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The microstructure of superheated as-cast A357 alloy has been analysed to study the solidification structures of α-Al dendrites, eutectic Si particles and intermetallic compounds at different sections of the specimen. The primary dendritic arms are broken to globular and spherical shaped of α-Al dendrites due to the thermal effect of superheating thermal treatment. Differential scanning calorimetry showed faster formation of endothermic peaks of superheated as-cast A357 alloy relatively also believed to be attributed by superheating thermal treatment. The solidification sequence of superheated A357 alloy was same as Sr modified Al7Si-Mg alloy  except for the reaction involving Al5FeSi intermetallic compound which started with Liq. → Al dendrites followed by Liq. → Al + Si and lastly Liq. → Al + Si + Mg2Si + Al8FeMg3Si6.