Hakim, Muhammad Luqman (2026) Analisis Pengaruh Variasi Temperatur Dan Waktu Penuaan (Aging) Perlakuan Panas T6 Terhadap Fasa Yang Terbentuk Pada Coran Remelting Aa 6061. (Analysis Of the Effect of Aging Temperature and Time Variations in T6 Heat Treatment on Phase Formation in Remelted Cast Aa 6061 Alloy). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.
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Abstract
AA 6061 aluminum alloy is one of the materials widely used in industrial applications due to its lightweight properties, good corrosion resistance, and ability to improve mechanical properties through heat treatment. T6 heat treatment is one of the methods used to increase material strength through the precipitation hardening mechanism by forming strengthening phases in the form of Mg₂Si. However, remelted materials experience changes in microstructural characteristics due to element segregation, changes in precipitate distribution, and the possibility of intermetallic phase formation that can affect the mechanical properties of the material. Therefore, controlling aging temperature and time is an important factor in determining the evolution of phases formed in remelted cast AA 6061 alloy. This study aims to analyze the effect of variations in aging temperature and time of T6 heat treatment on the phases formed in remelted cast AA 6061 alloy and to determine their effect on the material hardness value. The research method was carried out through the remelting process of AA 6061 aluminum using a crucible furnace, followed by T6 heat treatment consisting of solution treatment, quenching, and artificial aging with temperature variations of 165°C, 185°C, and 205°C and holding time variations of 1.5 hours, 2.5 hours, and 3.5 hours. Microstructural observations and phase identification were performed using SEM-EDX (Scanning Electron Microscope - Energy Dispersive X ray Spectroscopy), while the mechanical properties of the material were analyzed using Brinell hardness testing. The results showed that T6 heat treatment affected the changes in microstructure and phase formation of remelted AA 6061 material. Based on SEM-EDX analysis, the main phase formed was an α-Al matrix with precipitates containing Mg and Si elements, indicating the formation of Mg₂Si phase as a strengthening phase. In addition, Fe and Si elements were also detected, which potentially formed AlFeSi intermetallic phases due to the remelting process. Variations in aging temperature and time affected precipitate development, where increasing aging temperature and time accelerated the diffusion process of Mg and Si, leading to increased precipitate formation until reaching the optimum condition before overaging occurred. The results of Brinell hardness testing showed that aging treatment increased the hardness value compared to specimens without heat treatment. The highest hardness value was obtained in specimen M2 with an aging temperature of 185°C for 2.5 hours, reaching 67.91 HB, indicating the most optimal precipitate formation condition in improving material hardness. After exceeding the optimum condition, increasing aging time caused a decrease in hardness due to precipitate growth, resulting in an overaging effect. Based on this study, it can be concluded that variations in aging temperature and time during T6 heat treatment affect phase formation and mechanical properties of remelted cast AA 6061 alloy. Optimal Mg₂Si precipitate formation can improve material hardness through the precipitation strengthening mechanism, while excessive aging treatment can reduce strengthening effectiveness due to changes in precipitate size and distribution.
| Item Type: | Thesis (Undergraduate) |
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| Uncontrolled Keywords: | AA 6061, Remelting, T6 Heat Treatment, Aging, SEM-EDX, Brinell Hardness. |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Fakultas Teknik > Program Studi Teknik Mesin |
| Depositing User: | 1422200132 Muhammad Luqman Hakim |
| Date Deposited: | 24 Aug 2026 05:16 |
| Last Modified: | 24 Aug 2026 05:16 |
| URI: | http://repository.untag-sby.ac.id/id/eprint/47949 |
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