Dianto, Adinda Sholehah (2026) Pengaruh Temperatur Solution Heat Treatment T6 Terhadap Struktur Mikro Dan Sifat Mekanik Lattice Structures Truncated Octahedron Aluminium 2024 Hasil Investment Casting. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Upaya pengurangan emisi karbon mendorong pengembangan material ringan untuk meningkatkan efisiensi energi pada sektor otomotif dan kedirgantaraan, salah satunya melalui pemanfaatan material seluler berbasis aluminium 2024. Namun, proses fabrikasi investment casting yang mampu menghasilkan detail geometri tinggi sering kali menghasilkan sifat mekanik yang relatif rendah akibat laju pendinginan yang tidak setimbang, sehingga diperlukan perlakuan panas lanjutan seperti T6. Penelitian ini bertujuan untuk menganalisis pengaruh variasi temperatur Solution Heat Treatment (SHT) dalam perlakuan panas T6 terhadap struktur mikro dan sifat mekanik Lattice Structures Truncated Octahedron (LTO) aluminium 2024 hasil investment casting. Spesimen LTO difabrikasi menggunakan metode rapid investment casting dengan bantuan vacuum suction untuk meningkatkan kemampuan alir logam cair. Variasi temperatur SHT yang digunakan adalah 475℃, 500℃, 525℃, dan 550℃ dengan waktu tahan 150 menit, kemudian dilanjutkan dengan proses quenching dan artificial aging pada temperatur 190℃ selama 12 jam. Karakterisasi dilakukan melalui pengamatan visual, analisis fasa menggunakan X-ray Diffraction (XRD), pengamatan mikrostruktur menggunakan Optical Microscopy (OM) dan Scanning Electron Microscopy–Energy Dispersive X-ray (SEM–EDX), serta pengujian kekerasan Vickers dan uji kompresi. Hasil penelitian menunjukkan bahwa peningkatan temperatur SHT meningkatkan efektivitas pelarutan fasa intermetalik dan memengaruhi distribusi ukuran butir. Perlakuan panas T6 dengan SHT 500℃ menghasilkan sifat mekanik dan struktur mikro paling optimal. Temperatur SHT yang lebih rendah memberikan peningkatan sifat mekanik yang terbatas, sedangkan temperatur yang lebih tinggi (525℃ dan 550℃) menyebabkan penurunan sifat mekanik akibat pertumbuhan butir yang tidak terkontrol.
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Efforts to reduce carbon emissions encourage the development of lightweight materials to improve energy efficiency in the automotive and aerospace sectors, one of which is through the application of aluminum-based cellular materials such as aluminum 2024. However, the investment casting process, which is capable of producing complex geometries with high dimensional accuracy, often results in relatively low mechanical properties due to non-uniform cooling rates. Therefore, subsequent heat treatment, such as T6, is required to enhance the material performance. This study aims to analyze the effect of solution heat treatment (SHT) temperature variation in the T6 heat treatment process on the microstructure and mechanical properties of truncated octahedron lattice (LTO) structures made of aluminum 2024 produced by investment casting. LTO specimens were fabricated using a rapid investment casting method assisted by vacuum suction to improve molten metal flowability. The SHT temperatures were varied at 475 °C, 500 °C, 525 °C, and 550 °C with a holding time of 150 minutes, followed by quenching and artificial aging at 190 °C for 12 hours. Material characterization was carried out through visual inspection, phase analysis using X-ray diffraction (XRD), microstructural observations using optical microscopy (OM) and scanning electron microscopy–energy dispersive X-ray (SEM–EDX), as well as Vickers hardness testing and compression testing. The results indicate that increasing the SHT temperature improves the dissolution of intermetallic phases and influences grain size distribution. The T6 heat treatment with an SHT temperature of 500 °C resulted in the most optimal microstructure and mechanical properties. Lower SHT temperatures provided limited improvement in mechanical properties, while higher temperatures (525 °C and 550 °C) led to a decrease in mechanical performance due to uncontrolled grain growth.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Aluminium 2024, Investment Casting, Lattice Structures, Solution Heat Treatment, T6 Heat Treatment |
| Subjects: | T Technology > TN Mining engineering. Metallurgy > TN775 Aluminum alloys--Metallurgy. T Technology > TS Manufactures > TS205 Metals--Heat treatment. T Technology > TS Manufactures > TS233 Sand casting. Metal castings--Thermal properties. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Adinda Sholehah Dianto |
| Date Deposited: | 20 Jan 2026 07:28 |
| Last Modified: | 20 Jan 2026 07:28 |
| URI: | http://repository.its.ac.id/id/eprint/129830 |
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