Pengaruh Variasi Holding Time Artificial Aging Terhadap Karakteristik Foam Paduan Al-Mg-Si Dengan Foaming Agent Caco3 Dan Stabilizer Al2O3

Safano, Bagastia Alief (2022) Pengaruh Variasi Holding Time Artificial Aging Terhadap Karakteristik Foam Paduan Al-Mg-Si Dengan Foaming Agent Caco3 Dan Stabilizer Al2O3. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Busa aluminium merupakan yang merupakan aluminium padat yang memiliki pori hasil dari pembentukan gas dalam pengecoran. Dalam penelitian ini, dilakukan pengecoran menggunakan paduan Al-Mg-Si, dengan kandungan Mg 0,8 - 1,2 dan Si 0,4 - 0,8. Pengecoran busa aluminium dilakukan menggunakan metode stir casting dengan temperatur leleh 750°C. Lalu ditambahkan stabilizer Al2O3 sebanyak 5% dan foaming agent berupa CaCO3 sebanyak 1% ditambahkan pada lelehan paduan Al dan diaduk. Proses pengadukan kedua penambahan material pada lelehan dilakukan selama 30 detik. Busa aluminium yang sudah terbentuk kemudian dipanaskan kembali pada proses solution treatment pada 580°C selama 100 menit dan diquench dalam air. Setelah itu, dilakukan variasi age hardening dalam furnace selama 5; 6; dan 7 jam pada temperatur 165°C dan dilakukan pendinginan udara. Dari diberikannya variasi holding time artificial aging selama 5, 6, dan 7 jam, dihasilkan pertumbuhan presipitat Mg2Si yang dapat dilihat dari hasil pengujin densitas, porositas, SEM-EDX, dan XRD. Pengujian densitas dan porositas tidak menunjukkan adanya tren atau perubahan dari perlakuan panas. Dari ketiga variasi waktu, spesimen AA5 memiliki sifat fisik terendah dengan 4 peak Mg2Si yang terdeteksi pada XRD dan persentase Mg2Si sebanyak 1,229% yang dihitung dari hasil uji SEM-EDX. Nilai tertinggi terdapat pada spesimen AA7 dengan 5 peak yang terdeteksi dan persentase Mg2Si sebesar 1,556%. Dengan tumbuhnya Mg2Si, dihasilkan perubahan sifat mekanik yang dapat dilihat dari pengujian kompresi dan impak. Spesimen AA5 memiliki sifat mekanik terendah dari ketiga variasi waktu dengan nilai plateau stress sebesar 70,645 MPa, plateau end stress sebesar 91,839 MPa, energy absorption sebesar 16,879 MJ/m3, serta impact strengthsebesar 4,476 kJ/m2. Nilai tertinggi terdapat pada spesimen AA7 memiliki sifat mekanik paling tinggi, dengan nilai plateau stress sebesar 85,589 MPa, plateau end stress sebesar 111,266 MPa, energy absorption sebesar 17,343 MJ/m, serta impact strength sebesar 5,250 kJ/m2. Dengan ini, dapat disimpulkan bahwa semakin lama holding time artificial aging, maka kapabilitas mekanik aluminium foam akan semakin meningkat. Dengan ini, dapat disimpulkan bahwa semakin lama holding time artificial aging, maka kapabilitas mekanik aluminium foamakan semakin meningkat.
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Aluminium foam is a solid aluminium with pores that is made by gas formed during casting. In this research, Al-Mg-Si alloy foam with 0,8 - 1,2 Mg dan 0,4 - 0,8 Si is made through the melt route, casted at 750°C. 5% Al2O3 stabilizer and 1% CaCO3 foaming agent are added to the melt and stirred at 30 seconds each. The resulting Al foams are then heated back to 580°C in solution treatment process for 100 minutes and then quenched in water. Then, the spesimens are heated once more in aging process with holding time variations of 5, 6, and 7 hours at 165°C and cooled in open air. The treated aluminium foams are then cut using wire cutting method into the standard dimensions of the tests. From the variation of holding time artificial aging for 5, 6, and 7 hours, the resulting growth of MgSi precipitates can be seen from the results of density, porosity, SEM-EDX, and XRD tests. All specimens show no trend or change of density, and can be thus concluded that precipitation hardening have no effet on it. Among the three variations, AA5 specimen has the lowest physical properties with 4 peaks of Mg2Si detected on XRD and the percentage of Mg2Si is 1,229% which is calculated from the results of the SEM�EDX test. The AA7 specimen has the highest detected peaks of 5 and the percentage of Mg2Si was 1,556%. With the growth of Mg2Si precipitates, changes in mechanical properties are produced which can be seen from compression and impact tests. Spesimen AA5 has the lowest mechanical properties among the three aging variations with a plateau stress value of 70,645 MPa, a plateau end stress of 91,839 MPa, energy absorption of 16,879 MJ/m3, and an impact strength of 4.476 kJ/m2. Spesimen AA7 has the highest mechanical properties, with a plateau stress value of 85,589 MPa, a plateau end stress of 111,266 MPa, energy absorption of 17,343 MJ/m3, and an impact strength of 5,250 kJ/m2. With this, it can be concluded that the longer

Item Type:	Thesis (Other)
Additional Information:	RSMt 620.112 Saf p-1 2022
Uncontrolled Keywords:	aluminium foam, kalsium karbonat, magnesium silisida, presipitat, aluminium foam, calcium carbonate, magnesium silicide, precipitate
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA433 Strength of materials.
Divisions:	Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	17 Dec 2024 07:37
Last Modified:	17 Dec 2024 07:37
URI:	http://repository.its.ac.id/id/eprint/116003

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