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Effects of different processing parameters on the semisolid microstructure of Al6061 produced by a direct thermal method

M. F. M., Tajudin and Asnul Hadi, Ahmad and Mohd Rashidi, Maarof (2021) Effects of different processing parameters on the semisolid microstructure of Al6061 produced by a direct thermal method. In: International Conference on Innovative Technology, Engineering and Sciences (ICTES 2020), 22 December 2020 , Virtual mode, Universiti Malaysia Pahang, Malaysia. .

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Abstract

The effect of different processing parameters consist of pouring temperature and holding time on the semisolid microstructure of Al6061 feedstock billet produced by direct thermal method has been investigated in the present paper. In this experimental works, molten aluminium alloy 6061 was poured into a thin cylindrical copper mould at a constant temperature of 660 °C and held at different holding times of 20 s, 40 s, and 60 s. After it reached the desired holding time, the copper mould was then quenched into room temperature water. The microstructure formation of feedstock billets was characterized after the feedstock billets were taken out from the mould. Results show that, due to the rapid cooling condition of the molten 6061 inside the copper mould, more globular microstructures were obtained. The sample produced with a pouring temperature of 660 °C and holding time of 20 s, globular microstructure were apparent. Simultaneously, the sample with a pouring temperature of 660 °C and a holding time of 20 s produced smaller grain size than the sample with a pouring temperature of 660 °C and a holding time of 40 s and 60 s. Based on the results, the globular microstructures were superior at a shorter holding time, which allowed them to be quenched faster into room temperature water. The results from this experimental works suggest that the DTM feedstock billet globular microstructure formation merely depended on the heat convection of the molten alloy out from the copper mould. The faster heat convection out from the molten alloy which retarded the formation of dendritic microstructure thus transformed it into a globular microstructure for semisolid metal processing

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Processing parameters; semisolid microstructure of Al6061; direct thermal method
Subjects: T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Mechanical Engineering
Institute of Postgraduate Studies
Faculty of Mechanical and Automotive Engineering Technology
Depositing User: Ms. Ratna Wilis Haryati Mustapa
Date Deposited: 18 Mar 2021 02:17
Last Modified: 15 Apr 2021 02:58
URI: http://umpir.ump.edu.my/id/eprint/30759
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