ANALISIS STRUKTUR DAN KOMPOSISI FASE PADUAN U-7%Mo-x%Zr (x = 1, 2, 3% berat) HASIL PROSES PELEBURAN

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ABSTRAK

ANALISIS STRUKTUR DAN KOMPOSISI FASE PADUAN  U-7%Mo-x%Zr (x = 1, 2, 3% berat) HASIL PROSES PELEBURAN. Telah dilakukan karakterisasi ingot paduan U-7%Mo-x%Zr hasil proses peleburan menggunakan tungku busur listrik dalam rangka pengembangan bahan bakar nuklir berbasis paduan uranium molibdenum. Proses peleburan dilakukan dengan arus listrik 150 A dalam media gas argon (Ar) dan setiap paduan dilebur dengan 5 kali pengulangan. Hasil uji ingot paduan yang diperoleh dari proses peleburan relatif bersesuaian dengan komposisi stoikiometri. Hasil refinement dari pola difraksi sinar-X menunjukkan bahwa struktur yang terbentuk pada ingot paduan
U-7%Mo-x%Zr adalah larutan padat molibdenum dan zirkonium ke dalam struktur bcc uranium. Peningkatan kadar Zr dalam paduan U-7%Mo meningkatkan kristalisasi bahan, yang dapat diamati dengan adanya peningkatan intensitas puncak pada bidang (110), (200), (211) dan (220). Hal ini menunjukkan bahwa di dalam ingot paduan U-7%Mo-x%Zr terjadi perubahan volume unit sel dan kerapatan atomik.

KATA KUNCI: metode proses peleburan, ingot paduan U-7%Mo-x%Zr, bahan bakar dispersi.

ABSTRACT

STRUCTURE ANALYSIS AND PHASE COMPOSITION OF U-7%Mo-x%Zr (x = 1, 2, 3 wt%) ALLOYS FROM MELTING PROCESS. The characterization of U-7%Mo-x%Zr alloys as result of melting process using an electric arc furnace has been conducted in order to develop nuclear fuel based on uranium molybdenum alloys. Melting process was conducted using an electric current of 150 A in argon (Ar) gas media and each alloy was melted for 5 times. The results of alloy testing obtained from the melting process matched the stoichiometry composition. Result of refinement from X-ray diffraction pattern indicated that the structures formed in U-7%Mo-x%Zr alloy was a solid solution of molybdenum and zirconium into bcc structure of uranium. The increase of Zr concentration in U-7%Mo alloy increased the crystallization of material, which can be observed through the increment of peak intensity in (110), (200), (211) and (220) planes. This indicates in U-7%Mo-x%Zr alloy ingot there was transformation of unit-cell volume and atomic density.

FREE TERMS: melting process method, U-7%Mo-x%Zr alloys, dispersion fuel