CHARACTERIZATION OF HIGH ENTROPY ALLOYS ALCRFENISI AS NUCLEAR FUEL CLADDING MATERIALS

• Main Author: Firmansyah, Teguh
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/66272
• Institution: Institut Teknologi Bandung

Nuclear reactors have a cooling water system that functions to reduce the temperature in the nuclear reactor. Nuclear fuel in the reactor has a cladding that must have a good corrosion resistance. This is due to cooling water system in nuclear reactor can lead to corrosion where material degradation occurs which allows leakage. Leaks in the fuel allow the release of fissile, fertile, and fission products which become contaminants in the cooling system that can emit radiation. If there is damage in cooling system, the contamination of these materials can be exposed. High entropy alloy (HEA) is a metal alloy consisting of five or more elements in equal or near equal atomic percent with higher mixing entropies than conventional alloys, so that have special properties such as high hardness and wear resistance, as well as excellent corrosion resistance. In this research, the AlCrFeNiSi HEA samples were produced by powder metallurgy technique with sintering process at 1000oC. Samples were made with various moles of Al (Al1, Al1.2, Al1.4), then density measurements, Rietveld analysis of X-ray diffraction patterns, observations of microstructure, hardness tests and corrosion tests were carried out in 3.5% wt NaCl solution. The analysis of x-ray diffraction pattern and corrosion rates were compared with the samples of AlCrFeNiMo and AlCrFeNiZr. The result of this research shows that the corrosion rate of HEA samples was influenced by composition of HEA. The lowest corrosion rate was obtained by the Al1.2CrFeNiSi sample of 0.039 mm/year and the highest corrosion rate obtained by the AlCrFeNiSi sample of 0.054 mm/year. However, when compared to the HEA samples with Mo and Zr elements, the samples with Si element had better corrosion resistance. This is due to in 3.5wt% NaCl solution, Zr and Mo are more soluble.