硼对AlFeCoNi高熵合金组织和高温氧化性能的影响

Effect of Boron on Microstructure and High Temperature Oxidation Properties of AlFeCoNi High Entropy Alloy

摘要:

采用真空电弧熔炼炉制备了AlFeCoNiBx高熵合金，并对其微观组织和高温氧化行为进行了研究，结果表明：随B含量的增加，AlFeCoNiBx合金组织从单一的“B2结构”转变为“B2结构+（FCC1+FCC2）共晶组织”。AlFeCoNiBx合金于900℃高温氧化后，随B含量的增加，合金外层CoFe2O4氧化物的厚度增加较快，而内层Al2O3氧化物的厚度基本不变，但当B含量超过0.15at%时，氧化膜连续性变差。当B含量为0.15at%时，AlFeCoNiB0.15高熵合金的氧化增重最小，氧化膜与合金基体结合良好，抗氧化性最优。

Abstract:

AlFeCoNiBx high entropy alloy was prepared by vacuum arc melting, and its microstructure and high temperature oxidation behavior were studied. The results show that the increase of B content leads to the transformation of the alloy from "pure B2 phase" to "B2 phase +(FCC1+FCC2)eutectic". After oxidation of AlFeCoNiBx at 900 ℃, With the increase of B content, the thickness of outer CoFe2O4 oxide increases rapidly, while that of inner layer Al2O3 remains unchanged. However, when the content of B exceeds 0.15at%, the continuity of oxide film becomes worse. When the content of B is 0.15at%, the oxidation weight gain is the smallest, the oxide film is well bonded with the alloy substrate, and the oxidation resistance is the best.