Saputra, Rizkhi Bagas (2026) Pengaruh Temperatur Solution Treatment T6 Terhadap Struktur Mikro Dan Sifat Mekanik Lattice Structure Truncated Octahedron Aluminium 2024 Hasil Lost-Pla Investment Casting. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Material seluler berbentuk lattice structures berbasis aluminium menarik perhatian luas karena mampu mengombinasikan densitas rendah dengan kinerja mekanik yang tinggi, namun hasil pengecoran sering menghasilkan heterogenitas mikrostruktur dan porositas yang menurunkan sifat mekanik. Pengendalian perlakuan panas T6, khususnya pada tahap solution heat treatment (SHT), menjadi pendekatan penting untuk meningkatkan homogenisasi mikrostruktur dan performa mekanik pada struktur lattice aluminium hasil casting. Penelitian ini bertujuan menganalisis pengaruh variasi temperatur holding pada tahap solution heat treatment T6 terhadap struktur mikro dan sifat mekanik lattice structures truncated octahedron aluminium 2024 hasil lost-PLA investment casting. Spesimen difabrikasi menggunakan metode lost-PLA investment casting dengan pola hasil Fused Filament Fabrication (FFF) berbahan PLA dan bantuan vacuum suction untuk meningkatkan pengisian cetakan. Variabel penelitian meliputi temperatur SHT sebesar 475 °C, 500 °C, 525 °C, dan 550 °C dengan waktu tahan 100 menit, dilanjutkan quenching air dan artificial aging pada 190 °C selama 12 jam. Karakterisasi dilakukan melalui pengujian kekerasan Vickers, uji kompresi, metalografi optik, Optical Emission Spectroscopy (OES), Scanning Electron Microscopy–Energy Dispersive X-ray (SEM–EDX), dan X-Ray Diffraction (XRD). Hasil menunjukkan bahwa kekerasan rata-rata meningkat dari 81,8 HV pada kondisi as-cast menjadi maksimum 98,5 HV setelah SHT pada 500 °C, kemudian meningkat signifikan hingga 113,5 HV pada kondisi AA500. Kekuatan tekan juga meningkat dari 4,95 MPa (as-cast) menjadi maksimum 17,53 MPa pada AA500, sebelum menurun pada temperatur SHT yang lebih tinggi akibat kondisi oversolutionized. Analisis mikrostruktur dan XRD mengonfirmasi pelarutan fasa intermetalik Al₂Cu dan Al₂CuMg selama SHT serta presipitasi kembali fasa penguat selama artificial aging. Porositas hasil pengecoran tetap teramati setelah perlakuan panas, namun mengalami reduksi ukuran dan morfologi yang lebih halus. Secara keseluruhan, temperatur SHT 500 °C memberikan kombinasi sifat mekanik paling optimal pada lattice structures aluminium 2024.
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Cellular lattice structures based on aluminum have attracted significant interest due to their ability to combine low density with high mechanical performance; however, casting-based fabrication often results in microstructural heterogeneity and inherent porosity that degrade mechanical properties. Controlling T6 heat treatment, particularly during the solution heat treatment (SHT) stage, is therefore essential to improve microstructural homogeneity and mechanical performance of cast aluminum lattice structures. This study aims to analyze the effect of solution heat treatment temperature variation on the microstructure and mechanical properties of truncated octahedron lattice structures made of aluminum 2024 fabricated by lost-PLA investment casting. The lattice structures were produced using a lost-PLA investment casting process with PLA patterns fabricated by fused filament fabrication (FFF) and assisted by vacuum suction to enhance molten metal flow and mold filling. The experimental variables consisted of SHT temperatures of 475 °C, 500 °C, 525 °C, and 550 °C with a holding time of 100 minutes, followed by water quenching and artificial aging at 190 °C for 12 hours. Characterization was carried out using Vickers hardness testing, compression testing, optical microscopy, Optical Emission Spectroscopy (OES), Scanning Electron Microscopy–Energy Dispersive X-ray (SEM–EDX), and X-Ray Diffraction (XRD). The results show that the average hardness increased from 81.8 HV in the as-cast condition to a maximum of 98.5 HV after SHT at 500 °C, and further increased significantly to 113.5 HV after artificial aging in the AA500 condition. The compressive strength increased from 4.95 MPa in the as-cast condition to a maximum of 17.53 MPa in the AA500 condition, before decreasing at higher SHT temperatures due to an oversolutionized condition. Microstructural and XRD analyses confirmed the dissolution of Al₂Cu and Al₂CuMg intermetallic phases during SHT and the re-precipitation of strengthening phases during artificial aging. Casting-induced porosity remained present after heat treatment but exhibited reduced size and a more refined morphology. Overall, an SHT temperature of 500 °C provides the most optimal combination of mechanical properties for aluminum 2024 lattice structures.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | aluminium 2024; solution heat treatment; lattice structures; artificial aging; sifat mekanik, aluminum 2024; solution heat treatment; lattice structures; artificial aging; mechanical properties |
| Subjects: | T Technology > TS Manufactures 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: | Rizkhi Bagas Saputra |
| Date Deposited: | 02 Jul 2026 08:53 |
| Last Modified: | 02 Jul 2026 08:53 |
| URI: | http://repository.its.ac.id/id/eprint/134228 |
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