Sya'ban, Achmad Yusuf (2026) Analisa Cacat Coran dan Pengaruh Variasi Temperatur dan Waktu Penuaan (Aging) Perlakuan Panas T6 Terhadap Strukturmikro Coran Remelting AA 6061. (Analysis of Casting Defects and the Effect of T6 Heat Treatment Aging Temperature and Time Variations on the Microstructure of Remelted AA 6061 Castings). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.
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Abstract
AA6061 aluminum alloy is widely used in various industrial applications due to its advantages, such as good corrosion resistance and the ability to improve its mechanical properties through heat treatment. This study aimed to investigate the effects of the remelting process and T6 heat treatment on material defects, elemental composition, and hardness of AA6061 aluminum alloy after remelting. The remelting process was carried out using a crucible furnace and an open iron mold, followed by T6 heat treatment with aging temperature variations of 165°C, 185°C, and 205°C and aging times of 1.5 hours, 2.5 hours, and 3.5 hours. The tests conducted in this study included dye penetrant testing, Brinell hardness testing, and Scanning Electron Microscope–Energy Dispersive X-ray Spectroscopy (SEM-EDX) analysis. The results showed that the remelting process reduced the hardness value from 81.04 BHN in the raw material specimen to 55.21 BHN in the specimen without T6 treatment due to microstructural changes and the formation of casting defects. Dye penetrant observations revealed the presence of porosity and crack defects in the cast products. SEM-EDX analysis indicated that aluminum (Al) remained the dominant element, while the alloying elements magnesium (Mg) and silicon (Si) experienced redistribution as a result of the remelting process and heat treatment. The T6 heat treatment was proven to increase the hardness of the material, with the highest hardness value obtained in specimen 3C at an aging temperature of 205°C for 3.5 hours. The increase in hardness was attributed to precipitation strengthening through the formation of the Mg₂Si phase, which inhibited dislocation movement within the aluminum matrix. Therefore, the T6 heat treatment process was able to improve the mechanical properties of remelted AA6061 aluminum alloy, although it was not able to fully restore the hardness value to that of the raw material.
| Item Type: | Thesis (Undergraduate) |
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| Uncontrolled Keywords: | Aluminium AA 6061, remelting, perlakuan panas T6, SEM – EDX, kekerasan brinell, Mg2Si. |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Fakultas Teknik > Program Studi Teknik Mesin |
| Depositing User: | 1422200160 Achmad Yusuf Sya’ban |
| Date Deposited: | 24 Aug 2026 05:26 |
| Last Modified: | 24 Aug 2026 05:26 |
| URI: | http://repository.untag-sby.ac.id/id/eprint/46372 |
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