| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 97 === The corrosion behavior of FeCoNiCrCu0.5 high-entropy alloys under various heat-treatment processes and corrosion environments was studied. The heat treatment of the as-cast alloy specimens was carried out at 1050℃ with 1 hour holding time. After water quenching serial heat-treatments at 350℃, 500℃, 650℃, 800℃ and 950℃ with 24 hours holding time were carried out. The corrosion resistance of the specimens has been evaluated by potentiodynamic polarization of immersion tests. The specimen treated at 950℃ exhibits serious corrosion in NaOH and H2SO4 solution due to significant segregation of Cu-riched phase. Because of the active sensitivity zone of appreciable potential difference, the high-entropy alloy was preferentially attacked along the Cu-riched phase.
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