Microstructural characterization and mechanical properties of semisolid A356 aluminium alloy

Mazlan, Muhamad Hafeez Fikri (2016) Microstructural characterization and mechanical properties of semisolid A356 aluminium alloy. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

A356 aluminium alloys have a wide application nowadays. The alloys have a mixture of many elements but the main elements for this alloys is aluminium metal with almost 92 %. A356 alloys was used in this study in order to determine which process will provides better properties, either conventional casting or cooling slope casting. The conventional casting process begins with pouring directly the molten alloys into the mold while the cooling slope casting process used cooling slope plate to facilitate the alloys to have globular microstructure before they entered the mold. Raw material of A356 aluminium alloy is heated until it achieved the molten state before pouring into the mold. In this study, there are two factors are used which were pouring temperature and cooling slope distance. The pouring temperature have 3 different input parameters that are 660°C, 680°C and 700°C respectively. Meanwhile the input parameters for cooling slope distance are 200mm, 300mm and 400 mm respectively. After the casting process, the billet is cut to produce small pieces to perform microstructure and hardness testing using ASTM E384 standard. Some the billet was undergo a CNC turning using ASTM E8M-03-200H standard to produce the specimen for tensile testing. The result of microstructure, hardness and tensile were compared to determine which process have better properties. The specimen that had undergone cooling slope and heat treatment have the finest globular microstructure, better hardness value and tensile strength compared to the conventional casting and cooling slope specimen. The cooling slope specimen provided fine globular microstructure, good hardness value and good tensile strength when compared to the conventional casting process.

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