Muhammad Faez Mohamad, Tajudin and Asnul Hadi, Ahmad and Juliawati, Alias and Nur Azhani, Abd Razak and Nasrul Azuan, Alang (2022) Microstructure characteristic of aluminium 6061 semi-solid feedstock billet produced with direct thermal method. In: The 6th National Conference for Postgraduate Research (NCON-PGR 2022) , 15 November 2022 , Virtual Conference, Universiti Malaysia Pahang, Malaysia. p. 76..
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Abstract
Direct thermal method is one of the semi-solid metal processing technique to produce a globular microstructure feedstock billet for thixoforming. In this experimental work, the molten Aluminium 6061 with a temperature of 660 °C and 680 °C was poured into a thin cylindrical copper mould. The molten Aluminium 6061 was held within the copper mould with a different holding times of 20 s, 40 s and 60 s. The copper mould was quenched into room temperature water after achieving the specified holding duration. After the feedstock billets were removed from the mould, the microstructure formation of the feedstock billets was characterized. It was found that sample 1 which was combination of pouring temperature of 660 °C and holding time of 20 s has the lowest grain size at 2507.87 μm2. The circularity, aspect ratio and ferret diameter was found at 0.75, 1.34 and 69.4 μm, respectively. It was apparent that sample 1 produced finer and globular microstructure. The rapid cooling condition of the molten metal within the copper mould resulted in more globular grain structure. Based on the result, it can be concluded that the microstructure were merely depended on the heat convection between molten alloy and the copper mould. The rapid cooling condition produced smaller and more globular microstructure feestock billet that suitable for thixoforming
| Item Type: | Conference or Workshop Item (Lecture) |
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| Uncontrolled Keywords: | Semi-solid processing; Globular microstructure;Semi-solid feedstock billet; Aluminium 6061. |
| Subjects: | T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery T Technology > TL Motor vehicles. Aeronautics. Astronautics |
| Faculty/Division: | Institute of Postgraduate Studies Faculty of Mechanical and Automotive Engineering Technology |
| Depositing User: | Mr Muhamad Firdaus Janih@Jaini |
| Date Deposited: | 30 Jan 2023 08:14 |
| Last Modified: | 30 Jan 2023 08:14 |
| URI: | http://umpir.ump.edu.my/id/eprint/36822 |
| Download Statistic: | View Download Statistics |
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