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"[Komposit paduan aluminium A356 berpenguat silikon karbida memiliki potensi untuk memiliki sifat mekanik yang baik dengan massa yang rendah. Pada penelitian ini, pengecoran dilakukan melalui metode pengecoran aduk dengan menambahakan silikon karbida dengan presentase 2%, 5%, 8%, 10% dan 15% fraksi volume ke dalam matriks, serta penambahan magnesium 10% fraksi berat sebegai agen pembasahan. Hasil penelitian menunjukkan peningkatan kekuatan tarik mencapai nilai optimum pada penambahan 8%. Selain itu, sifat kekerasan meningkat seiring dengan penambahan partikel penguat yang juga menyebabkan turunnya laju keausan. Karakterisasi struktur mikro menunjukkan terbentuknya huruf cina serta Mg2Si utama dan eutektik.

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Aluminium alloy A356 composite strengthened by silicon carbide particles has the potential to have good mechanical properties with low mass. In this study, casting was done by stir casting method by added silicon carbide 2%, 5%, 8%, 10% dan 15% volume fraction, also magnesium 10% weight fraction as a wetting agent. The results showed that the increase in tensile strength reach optimum point on the 8%. In addition, the nature of hardness increased with the addition of silicon carbide which also cause a decrease in the wear rate. Microstructure characterization showed the presence of chineese script, primary and eutectic Mg2Si.

, Aluminium alloy A356 composite strengthened by silicon carbide particles has the potential to have good mechanical properties with low mass. In this study, casting was done by stir casting method by added silicon carbide 2%, 5%, 8%, 10% dan 15% volume fraction, also magnesium 10% weight fraction as a wetting agent. The results showed that the increase in tensile strength reach optimum point on the 8%. In addition, the nature of hardness increased with the addition of silicon carbide which also cause a decrease in the wear rate. Microstructure characterization showed the presence of chineese script, primary and eutectic Mg2Si.

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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. "

"Pembuatan material komposit bermatriks Aluminium seri 6061 (Al-Mg-Si) berpenguatan nano partikel SiC memberikan peningkatan sifat mekanis. Penggunaan penguat berukuran nano meningkatkan kekuatan tanpa menurunkan nilai keuletan komposit secara signifikan.Pada penelitian ini, penambahan fraksi volume dari nano partikel SiC sebesar 0,05%, 0,10%, 0,15%, 0,20% dan 0,30% dilakukan untuk mengetahui titik optimal penambahan penguat. Penambahan Magnesium sebesar 10 wt.% dilakukan untuk menghasilkan pembasahan yang baik antara matriks dan penguatnya. Penambahan Stronsium sebesar 0,02 wt.% sebagai modifier dilakukan untuk meningkatkan sifat mekanis komposit.Hasil yang didapatkan, kekuatan tarik dan elongasi memiliki nilai optimum pada penambahan nano partikel SiC sebesar 0,10% dengan nilai mencapai 246,51 MPa dan 9%. Sedangkan nilai kekerasan dan harga impak memiliki nilai optimum pada penambahan nano partikel SiC sebanyak 0,30%. Persentase porositas meningkat seiring dengan peningkatannya volume fraksi nano partikel.

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The manufacturer of materials composite Aluminum series 6061 (Al-Mg-Si) with addition nano-particles SiC provide reinforcement of improved mechanical properties. The use of nano-sized reinforcement increases the strength without reducing ductility values significantly.

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 know the optimum volume fraction. Magnesium 10 vol.% were used as wetting agent to increase wettability between matrix and its reinforcement. Strontium 0,02 vol.% were used as modifier to increase mechanical properties of materials composite.

As the result, the ultimate tensile strength and elongation has the optimum value in addition of nano-particles volume fraction in the amount of SiC 0,10 % with value up to 246,51 MPa and 9%. However, hardness value and impact properties has the optimum value in addition of nano-particles volume fraction in the amount of SiC 0,30 %. The porosity percent tends to increase along with the increase of nano-particles volume fraction."

"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."

"Komposit Al A356/SiC dapat dibuat melalui metode Stir Casting, metode ini dipilih Karen memiliki nilai ekonomis yang baik serta mampu mendistribusikan penguat SiC secara merata. Pada penelitian ini dilakukan variasi penambahan Vf dari SiC. Variasi yang digunakan yaitu 5%, 10%, 15%, dan 20%. Untuk meningkatkan kemampubasahan dari SiC pada Al A356 ditambahakn Mg sebesar 10%. Selain itu, untuk meningkatkan kemampuan mekanis dari Al A356 sebagai matriks ditambahkan pula modifier AlSr sebesar 0,019% dan grain refiner TiB sebesar 0,11%.Hasil penelitian menunjukkan bahwa komposit Al A356/SiC 20% Vf memiliki sifat mekanis yang lebih baik daripada yang lain. Nilai kekuatan tariknya mencapai 148,5 MPa lalu elongasinya sebesar 8,5% dan kekerasannya mencapai 35,1 HRB. Akan tetapi nilai mekanis ini masih dibawah dari Al A356 As cast maupun Al 356 dengan penambahan AlSr dan TiB. Fenomena ini disebabkan karena adanya interaksi antara Sr dan B dalam jumlah berlebih.

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Composite Al A356 / SiC can be made through methods Stir Casting, methods have been because has a good economic value and be able to evenly distribute the SiC reinforcement. In this study, the addition %Vt variation of SiC. Variation used is 5%, 10%, 15%, and 20%. To improve wettability of SiC in Al A356 added 10% Mg. Then, to improve the mechanical properties of Al A356 as a matrix also added m 0.019% modifier AlSr and 0.11% grain refiner TiB.

The results showed that the composite Al A356 / SiC 20% Vf have better mechanical properties than others. The ultimate tensile strength reach 148.5 MPa with 8.5% elongation. Hardness values reach 35.1 HRB. However, the value is still below the mechanical Al A356 As cast and Al 356 with the addition AlSr and TiB. This phenomenon is due to the interaction between Sr and B in excess amount."

"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."

"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."

"ABSTRAKPenambahan partikel nano SiC kedalam matriks Al6061 menghasilkan material komposit dengan kekuatan mekanis yang tinggi namun tetap mampu mempertahankan sifat ulet. Magnesium sebesar 10% Vf juga ditambahkan sebagai agen pembasah agar didapatkan ikatan yang kuat pada daerah antarmuka. Pada penelitian ini digunakan variasi penambahan partikel nano SiC sebesar 0,05%, 0,10%, 0,15%, 0,20% dan 0,30% untuk mengetahui titik optimal penambahan penguat. Hasil dari penelitian ini menunjukkan penambahan partikel nano SiC optimal di komposisi 0,15%, dengan kekuatan tarik 263,43 MPa, presentase elongasi 7,67%, kekerasan 56,5 HRB, dan harga impak sebesar 0,0550 J/mm2. Peningkatan kekuatan mekanis pada komposit dihasilkan dari kehadiran fasa penguat Mg2Si, distribusi partikel nano SiC yang merata, serta pembasahan yang baik antara matriks dan partikel penguat.

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ABSTRACTThe addition of nano SiC particles to Al6061 matrix has enhancing the mechanical properties of metal matrix composite while the ductility properties still maintained. 10% Vf of magnesium were used as wetting agent to achieve strong interface bonding. In the present work, Al6061 reinforced with various amounts (0,05%, 0,10%, 0,15%, 0,20% and 0,30%) of nano SiC were prepared. Results of this study shows the optimum content of nano SiC in Al6061 matrix were 0,15% Vf, with UTS (Ultimate Tensile Strength) reached 263,43 MPa, 7,67% elongation, hardness up to 56,5 HRB, and 0,0550 J/mm2 impact value. The enhancement of mechanical properties of Al6061/SiC composite were influenced by the presence of Mg2Si phase, good distribution of nano SiC particles, and also good interface bonding between matrix and reinforce.;"

"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."

"Komposit merupakan material yang sedang dikembangkan, yang terdiri dari dua jenis material atau lebih untuk meningkatkan sifat mekanis. Komposit magnesium merupakan material yang cocok untuk dijadikan sebagai kerangka kendaraan karena magnesium merupakan logam yang memiliki nilai densitas paling rendah diantara logam lainnya sehingga dapat dihasilkan kerangka kendaraan yang ringan dengan sifat mekanik yang baik. Pada penelitian ini, komposit diciptakan dengan mencampurkan magnesium sebagai matriks dan nano SiC sebagai partikel penguat dengan penambahan fraksi volume sebesar 0.05 vf, 0.10 vf, 0.15 vf, 0.20 vf, dan 0.25 vf. Proses fabrikasi komposit magnesium ini adalah pengecoran aduk.Hasil dari penelitian ini menunjukan dengan adanya penambahan nano SiC sebagai partikel penguat dapat meningkatkan sifat mekanis. Penambahan partikel penguat nano SiC yang menghasilkan komposit magnesium dengan sifat mekanis yang paling baik adalah penambahan dengan fraksi volume 0.010 vf yang menghasilkan nilai kekerasan sebesar 38.64 HB dan laju keausan sebesar 0.0106 mm3/m. Peningkatan sifat mekanis pada komposit magnesium disebabkan oleh pengecilan ukuran butir dan mekanisme penguatan Orowan.

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Composites are advanced material which is being developed that contains of two materials or more in order to improve the mechanical properties. Magnesium composite is a suitable material to be applicated as vehicle body structure due to its lightweight and its low density. Thus, the vehicle body structure with lightweight and good mechanical properties can be achieved. In this research, magnesium composite is fabricated by mixing magnesium as composite matrix and nano SiC as reinforcement particle with the variation of the volume fraction 0.05 vf, 0.10 vf, 0.15 vf, 0.20 vf, and 0.25 vf with stir casting as fabrication methods.

The result of this research shows that with nano SiC addition as reinforcement particle will increase mechanical properties of magnesium composite. The best mechanical properties of magnesium composite is shown by the addition of 0.10 vf nano SiC. The result shows the brinnel hardness number of this composition is 38.64 HB and 0.0106 mm3 m wear rate. Mechanical properties of magnesium composite are increased due to several strengthening mechanism such as grain size reduction and Orowan strengthening mechanism."