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"Composite Al A6061 / SiC can be made through methods Stir Casting, this method has been used widely because has middle cost and able to distribute the SiC particle well. This research use variation of SiC, from 2%, 5%, 8%, 10%, and 15%. To enhance the wettability between particle and matrix, Mg 10% was added to the molten aluminium. The result showed that the addition of 10% SiC is optimum among others, with tensile strength reach 247,8 Mpa, elongation 7,04846 % and hardness 54,333 HRB. This mechanical properties is better than the Al A6061 as cast. From datas above, it can be concluded that the more SiC being added, will improve the mechanical properties of material. However, if SiC pass the optimum value, the SiC tend to agglomerated and will deterioriate the mechanical properties of Al A6061/SiC. ;Composite Al A6061 / SiC can be made through methods Stir Casting, this method has been used widely because has middle cost and able to distribute the SiC particle well. This research use variation of SiC, from 2%, 5%, 8%, 10%, and 15%. To enhance the wettability between particle and matrix, Mg 10% was added to the molten aluminium. The result showed that the addition of 10% SiC is optimum among others, with tensile strength reach 247,8 Mpa, elongation 7,04846 % and hardness 54,333 HRB. This mechanical properties is better than the Al A6061 as cast. From datas above, it can be concluded that the more SiC being added, will improve the mechanical properties of material. However, if SiC pass the optimum value, the SiC tend to agglomerated and will deterioriate the mechanical properties of Al A6061/SiC. ;Composite Al A6061 / SiC can be made through methods Stir Casting, this method has been used widely because has middle cost and able to distribute the SiC particle well. This research use variation of SiC, from 2%, 5%, 8%, 10%, and 15%. To enhance the wettability between particle and matrix, Mg 10% was added to the molten aluminium. The result showed that the addition of 10% SiC is optimum among others, with tensile strength reach 247,8 Mpa, elongation 7,04846 % and hardness 54,333 HRB. This mechanical properties is better than the Al A6061 as cast. From datas above, it can be concluded that the more SiC being added, will improve the mechanical properties of material. However, if SiC pass the optimum value, the SiC tend to agglomerated and will deterioriate the mechanical properties of Al A6061/SiC. "

"Komposit Aluminium 6061 berpenguat nanopartikel SiC dibuat menggunakan metode pengecoran aduk, dimana ditambahkan unsur Mg 10% untuk mengoptimalkan pembasahan antara matriks dan penguat serta penambahan grain refiner Al-TiB untuk meningkatkan sifat mekanik dari material. Penambahan fraksi volume nanopartikel sebesar 0,05%, 0,10%, 0,15%, 0,20%, dan 0,30% dilakukan untuk mengetahui fraksi volume optimal.Data hasil penelitian menunjukkan nilai kekuatan tarik maksimum sebesar 217,2 Mpa pada penambahan 0,15%vf dengan elongasi optimal 6% pada penambahan 0,20%vf. Nilai kekerasan terus meningkat seiring dengan penambahan fraksi volume, akan tetapi harga impak terus menurun seiring dengan penambahan fraksi volume. Porositas yang terbentuk semakin meningkat seiring dengan penambahan fraksi volume nanopartikel SiC. Penambahan unsur Al-TiB menghasilkan ukuran butir yang lebih kecil dan persebaran partikel serta porositas yang lebih merata.

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Aluminium 6061 composite reinforced with nanoparticles SiC produced by stir casting with the addition of Magnesium 10% as wetting agent to optimize wettability between matrix and reinforcement and addition of Titanium Boron as grain refiner to increase mechanical properties. In this study, addition of nano-particles volume fraction in the amount of SiC 0.05 %, 0.10 %, 0.15 %, 0.20 %, and 0.30 % were used in order to known the optimum volume fraction.As the result, the maximum of ultimate tensile strength is 271,2 Mpa in addition of 0,15%vf, with maximum elongation up to 6% in additon of 0,20%vf. Hardness value continues to rise with the addition of volume fraction, but the impact properties declines steadily with the addition of volume fraction. Porosity percentage increase with the addition of nanoparticles SiC."

"Komposit aluminium A356/nano SiC dapat menjadi material alternatif blok rem kereta dikarenakan sifatnya yang ringan, ulet, dan dapat ditingkatkan sifat mekanisnya. Pada penelitian ini digunakan variasi penambahan %Vf nano SiC sebesar 0.05%, 0.10%, 0.15%, 0.20%, dan 0.25% ke dalam matriks aluminium A356, serta dilakukan penambahan modifier Sr 0.046 wt% dan Mg 2 wt%.Hasil dari penelitian didapatkan peningkatan kekuatan yang optimum sebesar 175.45 MPa dengan elongasi sebesar 7.914% pada penambahan nano SiC 0.10 %Vf. Ketahanan aus juga meningkat seiring dengan peningkatan kekerasan komposit A356/nano SiC. Sedangkan kekuatan impak hanya berkurang sedikit akibat penambahan %Vf nano SiC. Peningkatan kekuatan mekanis terjadi akibat terbentuknya fasa MgAl2O4 pada antarmuka partikel nano SiC dan matriks Al A356 dan persentase porositas yang kecil. Penambahan modifier Sr menyebabkan fasa Si eutektik yang terbentuk menjadi halus.

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A356/nano SiC composite is an alternative material as train?s brake shoe because of its light weight, ductility, and the ability to improve its mechanical properties. In this work, the casting is done via stir casting method by various additions of 0.05%, 0.10%, 0.15%, 0.20%, and 0.25% volume fraction. Small amounts of Sr (0.046 wt%) and 2 wt% of Mg are also added into A356 matrix.

The results show the optimum UTS reach 175.45 MPa with elongation of 7.914% at addition of 0.10 %Vf nano SiC. The wear resistance of this composite also increase as the hardness increases as increasing of addition of nano SiC particle. Meanwhile, the impact strength just slightly decreases as the increasing of nano SiC addition. The improvement of mechanical properties of A356/nano SiC composite is contributed by formation of thin layer MgAl2O4 surrounding the nano SiC particles and low percentage of porosity. The addition of Sr caused the morphology of eutectic Si in the microstructure fine and fibrous."

"Pada penelitian ini dilakukan proses fabrikasi komposit Mg-Al-Sr sebagai matriks dengan penambahan penguat nano-SiC melalui metode pengecoran aduk. Penambahan fraksi volume penguat nano-SiC bervariasi yaitu sebesar 0.05 ; 0.10 ; 0.15 ; 0.20 , dn 0.25. Jika dibandingkan dengan paduan Mg-Al-Sr, penambahan partikel nano ke dalam matriks logam mampu meningkatkan sifat mekanik komposit yang dihasilkan. Penambahan fraksi volume nano-SiC sebesar 0.15 menghasilkan nilai kekerasan, harga impak, dan ketahanan aus paling optimum, serta disitribusi senyawa intermetalik yang terdispersi homogen di dalam struktur mikro. Hal ini disebabkan oleh semakin banyak penguat nano-SiC yang ditambahkan, maka aglomerasi cenderung meningkat sehingga proses penguatan menjadi kurang efektif. Karakterisasi komposit yang dilakukan adalah pengujian komposisi menggunakan OES, EDX, dan XRD; pengamatan struktur mikro menggunakan OM dan SEM; serta pengujian berupa pengujian kekerasan, impak, dan aus.

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Magnesium composite with Mg Al Sr as the matrix reinforced by nano SiC particles have successfully fabricated by stir casting process. Addition of nano SiC into magnesium matrix varies by 0.05 0.10 0.15 0.20 and 0.25 in volume fraction. Compared with Mg Al Sr alloy, addition of nano particles into matrix improves mechanical properties of composites. It is observed that the optimum composition of nano SiC is 0.15 Vf which have the highest hardness value, impact toughness, and resistance to abrasion. It is also abserved that addition 0.15 Vf nano SiC modify the microstructure of composite by dispersing the intermetallic compound. The addition of Vf nano SiC could have tendency to agglomerate and strengthening mechanism is not effectively occurred. The result of chemical characterization using OES, EDX, XRD, metalloghraphy using OM and SEM, mechanical testing using hardness, impact, and abrasive testing."

"ABSTRAKPenambahan nano SiC pada aluminium A356 bertujuan untuk meningkatkan sifat mekanisaluminium A356 dengan densitas yang tetap rendah. Penambahan nano SiC padapenelitian ini sebesar 0.10, 0.15, 0.20, 0.25, dan 0.30 %berat. Penggunaan nano SiCditujukan untuk menjaga keuletan dari material. Ikatan antar fasa yang baik diperlukanagar pengaruh nano SiC pada aluminium A356 berfungsi dengan baik. Untuk membuatikatan antar fasa yang baik diberikan penambahan magnesium, Mg, sebanyak 1 %berat.Proses fabrikasi yang digunakan adalah metode pengecoran aduk dimana pengecoran adukadalah metode yang ekonomis dan mudah untuk dioptimalkan. Sifat mekanis yangdidapatkan adalah optimum pada penambahan nano SiC sebanyak 0.25 %berat dimanakekuatan tarik sebesar 175.57 MPa yang meningkat 21.87%, kekerasan sebesar 60.8 HREyang meningkat 50.59%, harga impak sebesar 0.0287 Joule/mm3 yang meningkat 14.8%,dan ketahanan aus sebesar 1.75 x 10-5 mm3/mm yang lebih rendah 21.13% dibandingkansifat mekanis aluminiun A356. Proses dan komposisi yang tepat merupakan hal yangpenting dalam pembuatan komposit.

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ABSTRACTNano SiC addition on the aluminum A356 aims to improve the mechanical properties ofaluminum A356 with remains low density. The addition of nano SiC in this study at 0.10,0.15, 0.20, 0.25, and 0.30 %wt. The use of nano sized SiC intended to maintain theductility of the material. Good interfacial bonding is required to get nano SiC effect on thealuminum A356 is functioning properly. To create a good bonding between phases, giventhe addition of magnesium, Mg, 1% by weight. Fabrication process used is stir castingmethod which is an economical and easy to optimized method. The mechanical propertiesobtained optimum on addition of nano SiC as much as 0.25 %wt where the tensile strengthis 175.57 MPa which is increased by 21.87%, hardness is 60.8 HRE which is increased50.59%, the toughness is 0.0287 Joules/mm3 which is increased 14.8%, and the wearresistance is 1.75 x 10-5 mm3/mm lower 21.13% of aluminiun A356 mechanical properties.The right process and composition is important in the manufacture of composites with stircasting."

"Metode fabrikasi material komposit paduan Al 6061 dengan penambahan partikel mikro SiC dipilih menggunakan metode pengecoran aduk karena mampu mendistribusikan partikel penguat SiC dan memiliki nilai ekonomis yang baik. Material ini kemudian diharapkan memiliki sifat mekanis yang baik dengan densitas yang relatif rendah.Pada penelitian ini dilakukan variasi penambahan volume fraksi dari partikel miro SiC sebesar 2%, 4%, 6%, 8%, dan 10% untuk mengetahui nilai optimal dari penambahan partikel penguat. Penambahan Mg sebesar 10 wt.% dilakukan untuk meningkatkan kemampubasahan dan penambahan Sr dan TiB dilakukan untuk meningkatkan sifat mekanis dari material komposit. Kemudian didapatkan nilai kekuatan tarik, elongasi, dan kekerasan memiliki nilai maksimal pada penambahan partikel penguat SiC sebesar 10 wt.% dengan nilai masing-masing 230 MPa, 6,5%, dan 62,2 HRB. Sedangkan nilai kekuatan impak memiliki nilai optimum pada penambahan partikel penguat sebesar 4% dengan nilai 0.0294 Joule/mm2. Kemudian juga didapatkan bahwa persentase porositas terus meningkat seiring dengan peningkatan volume fraksi dari partikel penguat.

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Manufacturing of composite material Aluminum Alloy (Al-Mg-Si) with the addition of micro SiC particles reinforcement chosen using stir casting method because it can be able to evenly distribute the SiC particles reinforcement and has a good economic value. Then this addition of SiC particles predicted will improved the mechanical properties and density of the materials.

In this study, the addition of micro particles volume fraction in the amount of SiC 2%, 4%, 6%, 8%, and 10% were used in order to know the optimum volume fraction. The addition of Mg 10 wt.% were used as wetting agent to increase the wettability between matrix and reinforce and the addition of AlSr and TiB were used to increase the mechanical properties. As a result, the ultimate tensile strength, elongation, and hardness value has a maximum value in addition of micro particles volume fraction in the amount of SiC 10 wt.%with the value up to 230 MPa, 6,5%, dan 62,2 HRB. However, the impact value and hardness value has a optimum value in addition of micro particles volume fraction in the amoung of SiC 4% with the value 0.0294 Joule/mm2. The percentages of porosity were increased along with the increase of micro particles volume fraction."

"ABSTRAKKomposit aluminium 6061 dengan partikel penguat nano SiC sudah banyak dikembangkan untuk aplikasi yang membutuhkan sifat mekanis yang baik dengan densitas yang rendah. Dalam rangka mencapai performa yang lebih baik, perlakuan panas T6 diberikan untuk meningkatkan sifat mekanis material komposit. Pada penelitian ini dilakukan proses perlakuan panas T6 dengan variasi waktu aging 2 jam, 4 jam, 6 jam, 8 jam, dan 10 jam pada temperatur 175 oC. Solution treatment dilakukan pada temperatur 440 oC selama 1 jam. Hasil penelitian menunjukkan bahwa waktu optimum aging adalah 10 jam yang ditandai dengan hasil kekerasan paling tinggi yaitu sebesar 66,22 HRB dan laju aus paling rendah yaitu sebesar 1,09 x 10-6 mm3/mm. Pengaruh perlakuan panas T6 terhadap hasil uji tarik sangat rendah akibat adanya porositas. Hasil struktur mikro dari mikroskop optik dan SEM menunjukkan adanya fasa α-Al, Mg2Si biner (Al+Mg2Si), dan fasa intermetalik β-Al2Mg3.

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ABSTRACTAluminum 6061 composites reinforced by SiC nanoparticles has been widely used for high performance applications with low denstity. In order to obtain a better performance, artificial aging is conducted to improve mechanical properties of composite. In this study, aging treatment was done with varying aging time: 2h, 4h, 6h, 8h, and 10h at 175 oC with solution treatment at 440 oC for 1h. The results showed that the optimum aging time was achieved by 10h with the highest hardness up to 66,22 HRB and wear rate reached the lowest value by 1,09 x 10-6 mm3/mm. Heat treatment process did not show a strong influence to tensile strength due to a porosity. OM and SEM observation exhibit α-Al and binary Mg2Si (Al+Mg2Si) phases, and intermetallic phases of β-Al2Mg3."