科研之友
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摘要
An oxidation resistance study has been made on Nb-Cr-V-W-Ta high entropy alloy in a range of temperature from 600 to 1400℃ in air. Static oxidation study has been performed for either(a) 12 or 24 h of heating time or(b) 3 or 10℃/min heating rates to the desired oxidation temperature. Cyclic oxidation study conducted for three and a half days has been conducted at 600, 700, and 800℃ using 12 h of heating cycles. The alloy can withstand the cyclic oxidation process with only a reasonable loss of alloy. The identification of oxides indicates crystals of W and Ta oxides in cylindrical form while Nb and Cr oxides show a nodular or granular morphology at both 1000 and 1200℃ while and additional of oxide of V in whisker forms at 1200℃.
