MUZAKKIR, ACHMAD KAHFI (2025) PENGARUH VARIASI TEMPERATUR TERHADAP PERUBAHAN FASE PADA PROSES SINTERING Al50(FeCr)45SiC5 YANG DISINTESIS DENGAN HIGH ENERGY MILLING. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
This study aims to evaluate the effect of sintering temperature variations on changes in density and phase structure in Al50(FeCr)45SiC5 alloys synthesised using the High Energy Milling (HEM) method. The sintering process was carried out at three different temperatures, namely 600°C, 700°C, and 800°C with a holding time of 2 hours. Density evaluation was carried out using the Archimedes method, while crystal structure characterisation was analysed using X-Ray Diffraction (XRD). The density test results showed that the highest density was achieved at 700°C with an average of 3.91 g/cm³, slightly higher than 600°C (3.86 g/cm³) and decreased at 800°C (3.67 g/cm³), indicating the potential for over-sintering. XRD diffraction patterns identified the presence of the main phases of Al, Fe, Cr, and SiC, as well as the formation of a significant Al₅Fe₂ intermetallic phase at 700°C and 800°C. The increasing intensity of the Al₅Fe₂ peak as the temperature rises indicates the formation of a thermodynamically stable reinforcing phase. The SiC phase remains consistently present at all temperatures without degradation. These results indicate that the optimal sintering process occurs at 700°C, which results in high density and good formation of intermetallic phases without degradation of the microstructure. Sintering in a vacuum atmosphere was also shown to be more effective than an argon atmosphere in preventing oxidation and improving material quality. Keywords: Al50(FeCr)45SiC5, Sintering, Intermetallic Phase, XRD, Density Penelitian ini bertujuan untuk mengevaluasi pengaruh variasi temperatur sintering terhadap perubahan densitas dan struktur fase pada paduan Al50(FeCr)45SiC5 yang disintesis menggunakan metode High Energy Milling (HEM). Proses sintering dilakukan pada tiga temperatur berbeda, yaitu 600°C, 700°C, dan 800°C dengan waktu tahan selama 2 jam. Evaluasi densitas dilakukan dengan metode Archimedes, sementara karakterisasi struktur kristal dianalisis menggunakan X-Ray Diffraction (XRD). Hasil pengujian densitas menunjukkan bahwa densitas tertinggi dicapai pada temperatur 700°C dengan rata-rata 3,91 g/cm³, sedikit lebih tinggi dibandingkan 600°C (3,86 g/cm³) dan menurun pada 800°C (3,67 g/cm³), mengindikasikan potensi terjadinya over-sintering. Pola difraksi XRD mengidentifikasi adanya fase utama berupa Al, Fe, Cr, dan SiC, serta pembentukan fase intermetalik Al₅Fe₂ yang signifikan pada temperatur 700°C dan 800°C. Meningkatnya intensitas puncak Al₅Fe₂ seiring naiknya temperatur menandakan terbentuknya fase penguat yang stabil secara termodinamika. Fase SiC tetap hadir secara konsisten di semua temperatur tanpa mengalami degradasi. Hasil ini menunjukkan bahwa proses sintering optimal terjadi pada 700°C, yang menghasilkan densitas tinggi dan pembentukan fase intermetalik yang baik tanpa degradasi struktur mikro. Sintering dalam atmosfer vakum juga terbukti lebih efektif dibandingkan atmosfer argon dalam mencegah oksidasi dan meningkatkan kualitas material. Kata kunci: Al50(FeCr)45SiC5, Sintering, Fase Intermetalik, XRD, Densitas
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