TAMAMI, MUHAMMAD FAIRUZ (2024) PENGARUH JUMLAH LAPISAN MAGNET PADA PERMANENT MAGNETIC STIRRING DAN KOMPOSISI TEMBAGA TERHADAP KEKERASAN DAN STRUKTUR MIKRO PRODUK COR PADUAN Al-Cu. S1 thesis, Fakultas Teknik Universitas Sultan Ageng Tirtayasa.
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Abstract
Al-Si alloy is an alloy that is widely used in making motorcycle pistons because it is light and corrosion resistant but can increase strength values. However, there is residual stress which causes hot tears or cracks to occur during the solidification process. Therefore, Al-Si alloys require the addition of alloying elements such as copper (Cu). The results of Al-Cu alloy cast products usually form a dendrite structure and the copper distribution is uneven. So it is necessary to use a Permanent Magnetic Stirring (PMS) device. This research was carried out by applying an aluminum metal casting process and adding copper with a composition of 1 wt%, 3 wt% and 5 wt%. After that, the mixing process was carried out using a PMS tool with variations in the number of magnetic layers of 3 layers, 4 layers and 5 layers. The conclusion obtained from the results of the tests that have been carried out is that the greater the number of magnetic layers, the smaller the size of Al2Cu and Si. For hardness results, when there is no stirring, using PMS produces a higher hardness value than using PMS. Then the microstructure results when using PMS Al2Cu are relatively evenly distributed compared to without PMS and the more copper (Cu) in the composition, the higher the resulting hardness value.
| Item Type: | Thesis (S1) | |||||||||
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| Additional Information: | Paduan Al-Si adalah paduan yang banyak digunakan pada pembuatan piston sepeda motor karena ringan dan tahan korosi namun mampu menaikkan nilai kekuatan. Namun terdapat tegangan sisa yang membuat terjadinya cacat hot tears atau retak pada saat proses solidifikasi. Oleh karena itu, paduan Al-Si dibutuhkan adanya penambahan unsur paduan seperti penambahan tembaga (Cu). Hasil produk cor paduan Al-Cu biasanya terbentuk adanya struktur dendrit dan persebaran tembaganya tidak merata. Sehingga dibutuhkan penggunaan alat Permanent Magnetic Stirring (PMS). Penelitian ini dilakukan dengan menerapkan proses pengecoran logam aluminium serta penambahan tembaga dengan komposisi sebanyak 1 wt%, 3 wt% dan 5 wt%. Setelah itu, dilakukan proses pengadukan menggunakan alat PMS dengan variasi jumlah lapisan magnet sebesar 3 lapis, 4 lapis dan 5 lapis. Diperoleh kesimpulan dari hasil pengujian yang telah dilakukan yaitu, semakin besar jumlah lapisan magnet maka akan semakin memperkecil ukuran Al2Cu dan Si. Untuk hasil kekerasan ketika tidak adanya pengadukan menggunakan PMS menghasilkan nilai kekerasan yang lebih tinggi dibandingkan menggunakan PMS. Kemudian untuk hasil struktur mikro ketika menggunakan PMS Al2Cu relatif tersebar merata dibandingkan tanpa PMS dan semakin banyak komposisi tembaga (Cu) maka akan semakin tinggi pula nilai kekerasan yang dihasilkan. | |||||||||
| Subjects: | T Technology > TS Manufactures | |||||||||
| Divisions: | 03-Fakultas Teknik 03-Fakultas Teknik > 27201-Jurusan Teknik Metalurgi |
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| Depositing User: | Mr Muhammad Fairuz Tamami | |||||||||
| Date Deposited: | 26 Feb 2024 11:58 | |||||||||
| Last Modified: | 26 Feb 2024 11:58 | |||||||||
| URI: | http://eprints.untirta.ac.id/id/eprint/33479 |
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