Pengaruh Komposisi Paduan Terhadap Pembentukan Nanokristal Bahan Gelas Metalik Berbasis Zirkonium

Dwinanda, Linda (2006) Pengaruh Komposisi Paduan Terhadap Pembentukan Nanokristal Bahan Gelas Metalik Berbasis Zirkonium. Masters thesis, Institut Teknologi Sepuluh November.

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Abstract

Telah dilakukan analisis pengaruh komposisi unsur dalam paduan terhadap pembentukan nanokristal pada bahan gelas metalik berbasis zirkonium. Gelas metalik dikarakterisasi menggunakan Differential Scanning Calorimeter (DSC), dan dari hasil analisis diperoleh nilai temperatur transisi gelas (Tg) sebesar 378,5 °C, 368 °C, dan 392 °C serta nilai temperatur kristalisasi (Tx) sebesar 428 °C, 415,5 °C, dan 431 °C, masing-masing untuk Zr₅₀Cu₄₀Ni₁₀Al₅, Zr₅₀Cu₃₅Ni₁₀Al₅, dan Zr₅₅Cu₃₀Ni₁₀Al₅. Nilai ΔTx menurun seiring dengan penambahan komposisi zirkonium. Paduan Zr₅₀Cu₄₀Ni₁₀Al₅ memiliki kemampuan pembentukan gelas (Glass Forming Ability/GFA) terbaik dengan nilai ΔTx mencapai 49,5 °C. Sebelum dan sesudah dipanaskan pada temperatur 400 °C selama 90 menit, fasa yang terbentuk diuji menggunakan X-ray Diffractometer (XRD). Kristal yang terbentuk adalah oksida ZrO₂ berstruktur tetragonal dan CuZr berstruktur ortorombik. Ukuran rata-rata kristal berkisar antara 9,03 hingga 17,12 nm. Tidak terdapat pengaruh komposisi terhadap fasa kristal yang terbentuk.
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The effect of alloy composition on the nanocrystallization of zirconium-based metallic glasses was analyzed. The metallic glasses were characterized using a Differential Scanning Calorimeter (DSC). The analysis yielded glass transition temperatures (Tg) of 378.5 °C, 368 °C, and 392 °C and crystallization temperatures (Tx) of 428 °C, 415.5 °C, and 431 °C for Zr₅₀Cu₄₀Ni₁₀Al₅, Zr₅₀Cu₃₅Ni₁₀Al₅, and Zr₅₅Cu₃₀Ni₁₀Al₅, respectively. The value of ΔTx decreased with increasing zirconium content. The Zr₅₀Cu₄₀Ni₁₀Al₅ alloy exhibited the best glass-forming ability (GFA), with a ΔTx value of 49.5 °C. Before and after heat treatment at 400 °C for 90 minutes, the crystalline phases were examined using an X-ray Diffractometer (XRD). The crystalline phases formed were tetragonal ZrO₂ and orthorhombic CuZr. The average crystallite size ranged from 9.03 to 17.12 nm. The composition had no significant effect on the crystalline phases formed.

Item Type:	Thesis (Masters)
Additional Information:	RTFi 669.94 Dwi p
Uncontrolled Keywords:	nanokristal, gelas metalik, zirkonium, XRD, nanocrystallization, metallic glass, zirconium, XRD.
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Mathematics and Science > Physics > 45101-(S2) Master Thesis
Depositing User:	magang .
Date Deposited:	30 Sep 2026 03:17
Last Modified:	30 Sep 2026 03:17
URI:	http://repository.its.ac.id/id/eprint/145070

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