Sari, Ulan (2019) Pengaruh Penambahan Grain Refiner AlTiB dan Modifier Stronsium terhadap Mikrostruktur dan Sifat Mekanik Paduan Aluminium ADC12 dengan Metode Gravity Casting. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Paduan Al scrap ingot (ADC12) mengandung Fe dengan kadar tinggi, yaitu sebesar 5,34wt% yang menyebabkan terbentuknya fasa intermetalik α-Al8Fe2Si (chinese script) dan β-Al5FeSi (needle-like). Untuk mengurangi pengaruh buruk dari fasa intermetalik ini, maka dilakukan proses netralisasi dengan cara menambahkan modifier dan grain refiner. Pada penelitian ini menggunakan variasi penambahan modifier Sr sebesar 0,015wt%; 0,03wt%; 0,045wt%; 0,06wt% dan grain refiner AlTiB tetap sebesar 0,15wt% dengan metode gravity casting. Karakterisasi mikrostruktur menggunakan XRF (X-Ray Fluorescence), SEM (Scanning Electron Microscope), EDX (Energy Dispersive X-ray Analysis), serta XRD (X-Ray Diffraction). Sedangkan karakterisasi sifat mekanik paduan Al-Si coran menggunakan pengujian kekerasan dan densitas. Hasil karakterisasi mikrostruktur dan sifat mekanik menunjukkan, bahwa penambahan 0,06wt%Sr dan 0,15wt%AlTiB merupakan penambahan optimum modifier Sr dan grain refiner AlTiB karena mampu menurunkan jumlah intensitas fasa intermetalik, mengubah fasa intermetalik β-Al5FeSi menjadi fasa α-Al8Fe2Si sehingga morfologi fasa intermetalik menjadi lebih fibrous, serta mampu meningkatkan sifat mekanik paduan Al-Si coran yang diindikasikan dengan nilai keuletan (ductility) tinggi dan densitas rendah.
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Al scrap ingot material (ADC12) has a high content of Fe, which is 5,34wt% caused the formation of α-Al8Fe2Si (chinese script) and β-Al5FeSi (needle-like) intermetallic phases. To reduce the adverse effects of this intermetallic phase, a neutralization process is carried out by adding a modifier and grain refiner. In this research uses a variation of the addition of modifier Sr of 0,015wt%; 0,03wt%; 0,045wt%; 0,06wt% and a fixed variation of grain refiner AlTiB of 0,15wt% by gravity casting method. The microstructure characterization use XRF (X-Ray Fluorescence), SEM (Scanning Electron Microscope), EDX (Energy Dispersive X-ray Analysis), and XRD (X-Ray Diffraction). While the characterization of mechanical properties uses hardness and density testing. The results of microstructural characterization and mechanical properties show that the addition of 0,06wt%Sr and 0,15wt%AlTiB is the addition of the optimum modifier Sr and grain refiner AlTiB because it can reduce the number of intermetallic phase intensities, change the intermetallic β-Al5FeSi phase to α-Al8Fe2Si phase, so that the morphology of intermetallic phase becomes more fibrous, and also can improve the mechanical properties of Al-Si casting alloys which are indicated by high ductility and low density values.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSFi 531.14 Sar p-1 2019 |
| Uncontrolled Keywords: | ADC12, Grain Refiner AlTiB, Modifier Sr |
| Subjects: | Q Science Q Science > QC Physics Q Science > QC Physics > QC111 Density and specific gravity |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis |
| Depositing User: | Ulan Sari |
| Date Deposited: | 14 Oct 2024 03:26 |
| Last Modified: | 14 Oct 2024 03:26 |
| URI: | http://repository.its.ac.id/id/eprint/64458 |
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