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"[Komposit bermatriks aluminium dengan penguat partikel Al2O3 berukuran nano umum digunakan untuk aplikasi dengan performa yang tinggi karena aluminium memiliki sifat ringan dan Al2O3 memiliki performa yang baik pada suhu tinggi. Pada penelitian ini, penambahan Al2O3 dengan fraksi volum 0,2%, 0,5%, 0,7%, 1,0%, and 1,2% dilakukan untuk menentukan titik optimum dari kelima komposisi. Magnesium sebanyak 10 wt.% ditambahkan sebagai wetting agent. Hasil penelitian menunjukkan kekuatan optimum dicapai dengan penambahan fraksi volum nano-Al2O3 sebanyak 0,2% dengan 200,84 MPa dan keuletan yang baik, didukung dengan rendahnya porositas, rendahnya aglomerasi, dan pembentukan dimple pada permukaan patah.

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Aluminium Matrix Composites (AMCs) reinforced with nano-sized Al2O3 particles are widely used for high performance application because aluminium has light weight and alumina has good performance at high temperature. In this study, the percentage of nano-sized Al2O3 with volume fraction 0.2%, 0.5%, 0.7%, 1.0%, and 1.2% are performed to determine the optimum point of the fifth variation. Magnesium with 10 wt.% are added as a wetting agent. The result showed the optimum strength was reached by 0.2 %Vf nano-Al2O3 reinforced composite with 200.84 MPa and enough ductility, supported by evidence low porosity, low agglomeration, and dimples formation on SEM image.

, Aluminium Matrix Composites (AMCs) reinforced with nano-sized Al2O3 particles are widely used for high performance application because aluminium has light weight and alumina has good performance at high temperature. In this study, the percentage of nano-sized Al2O3 with volume fraction 0.2%, 0.5%, 0.7%, 1.0%, and 1.2% are performed to determine the optimum point of the fifth variation. Magnesium with 10 wt.% are added as a wetting agent. The result showed the optimum strength was reached by 0.2 %Vf nano-Al2O3 reinforced composite with 200.84 MPa and enough ductility, supported by evidence low porosity, low agglomeration, and dimples formation on SEM image.

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"Tegangan sisa merupakan hal yang tidak dapat dihindarkan dalam proses pengelasan, adannya proses transfer panas ke benda kerja membuat daerah pengelasan mengalami peningkatan suhu dan kemudian mengalami penurunan suhu secara cepat, yang menyebabkan adanya variasi kontraksi thermal. Tegangan sisa dapat diukur secara eksperimen menggunakan perangkat laser, difraksi sinar-X, dan difraksi neutron, namun metode tersebut cenderung memakan. Oleh karena itu pada penelitian ini, sebagai alternatif dari metode-metode ekperimental, dilakukan analisis tegangan sisa menggunakan metode elemen hingga ymelalui simulasi ANSYS. Pengelasan dilakukan pada AA5052 dan AA6061 menggunakan metode GMAW dengan masukan panas sebesar 0.5 kJ/mm. Dimensi sampel dimodelkan menggunakan SOLIDWORKS, dan data parameter hasil pengelasan dimasukan kedalam metode elemen hingga dalam bentuk simulasi termal dan struktural untuk memperoleh nilai dan distribusi tegangan sisa yang kemudian akan divalidasi dan dibandingkan dengan hasil pengujian tegangan sisa secara eksperimental menggunakan difraksi sinar-X metode cosα.

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Residual stress is something that cannot be avoided in the welding process, the heat transfer process to the workpiece makes the area experience an increase in temperature and then experience a rapid decrease in temperature, which causes variations in thermal contraction. Residual stresses can be measured experimentally using laser devices, X-ray diffraction, neutron diffraction, and sectioning methods. However, these methods tend to be time-consuming, and the measurement's accuracy is often on the precision of the measuring device and procedure. Therefore, in this study, as an alternative to experimental methods, a residual stress analysis was carried out using the finite element method, which was applied through the ANSYS simulation software. Welding was carried out on AA5052 and AA6061 using the GMAW method with a heat input of 0.5 kJ/mm. The sample dimensions were modeled on SOLIDWORKS and welding parameters were applied on the finite element method in thermal and structural simulation to obtain residual stress values , which would then be validated and compared with the experimental residual stress test results using the X-ray diffraction cos α method."