NOVAL, ANDRE (2025) EVOLUSI UKURAN PARTIKEL DAN FASE PADA PADUAN Al-FeCr-SiC HASIL PEMADUAN MEKANIK BERENERGI TINGGI. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
This study focuses on the investigation of particle size evolution and phase transformation in Al–FeCr–SiC alloys synthesized through the High Energy Milling (HEM) method. The milling process was conducted with varying durations of 0, 30, and 60 minutes and compared with manual mixing using the hand mixing method. Characterization was performed using a Particle Size Analyzer (PSA) to evaluate particle size distribution and X-ray Diffraction (XRD) to identify phase changes and crystal structures. The milled samples, which reached the nanoscale, were subsequently subjected to sintering. Sintering is closely related to the diffusion rate between particles; the nanoscale particle size obtained enhances the diffusion rate, leading to the formation of a dense and compact alloy. PSA results demonstrated that the milling process significantly reduced particle size. The manually mixed sample had an average particle size of approximately 1080 nm, with a size reduction efficiency of only 8%. After 30 minutes of milling, the particle size decreased to 459 nm, achieving a reduction efficiency of 57.5%. At 60 minutes of milling, the particle size further decreased to 56.24 nm, representing a 94.8% reduction compared to the initial size. Particle size distribution also became narrower and more uniform with increasing milling time. XRD analysis revealed peak broadening and intensity reduction with longer milling durations, indicating crystallite size reduction, increased lattice strain, and the possible formation of solid solutions and intermetallic phases. The primary phases of Al, Fe, Cr, and SiC remained detectable throughout the milling process, with SiC particles maintaining stability as reinforcing elements. Overall, the HEM technique proved to be effective in reducing particle size to the nanoscale and modifying the microstructure of the Al–FeCr–SiC alloy. Keywords: Al–FeCr–SiC, High Energy Milling, Particle Size, PSA, XRD. Penelitian ini menitikberatkan pada studi mengenai evolusi ukuran partikel serta perubahan fase dalam paduan Al–FeCr–SiC yang disintesis melalui metode pemaduan mekanik berenergi tinggi High Energy Milling HEM. Proses milling dilakukan dengan variasi waktu 0, 30, dan 60 menit, serta dibandingkan dengan metode pencampuran manual hand mixing. Karakterisasi dilakukan menggunakan Particle Size Analyzer (PSA) untuk mengevaluasi distribusi ukuran partikel dan X-Ray Diffraction (XRD) untuk mengidentifikasi perubahan fase serta struktur kristal. Sampel yang sudah tergiling menjadi ukuran nano, kemudian dilanjutkan ke tahap sintering. Sintering berkaitan dengan laju difusi antarpartikel, ukuran nano yang diperoleh dapat meningkatkan laju difusi antarpartikel sehingga dapat memperoleh paduan yang kompak berdensitas tinggi. Hasil PSA menunjukkan bahwa proses milling secara signifikan menurunkan ukuran partikel. Campuran manual memiliki ukuran rata-rata partikel sekitar 1080 nm dengan efisiensi penurunan hanya 8%. Setelah proses milling selama 30 menit, ukuran partikel turun menjadi 459 nm dengan efisiensi penyusutan sebesar 57,5%. Sementara itu, pada waktu milling 60 menit, ukuran partikel semakin kecil hingga mencapai 56,24 nm, menunjukkan penurunan sebesar 94,8% dibanding ukuran awal. Distribusi ukuran partikel juga semakin sempit dan merata seiring waktu milling. Analisis XRD menunjukkan pelebaran puncak difraksi serta penurunan intensitas seiring bertambahnya waktu milling, yang mengindikasikan penyusutan ukuran kristalit, peningkatan regangan kisi, serta kemungkinan terbentuknya larutan padat dan fase intermetalik. Fase utama Al, Fe, Cr, dan SiC tetap terdeteksi hingga akhir proses milling, dengan partikel SiC yang tetap stabil sebagai unsur penguat. Secara keseluruhan, teknik HEM terbukti efektif dalam memperkecil ukuran partikel hingga skala nanometer dan memodifikasi struktur mikro paduan Al–FeCr–SiC. Kata Kunci: Al–FeCr–SiC, High Energy Milling, Ukuran Partikel, PSA, XRD.
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