FeCoNiMnB_x高熵合金微观组织及力学性能的研究

Study on Microstructure and Mechanical Properties of FeCoNiMnB_x High Entropy Alloy

采用真空电弧熔炼技术熔炼了FeCoNiMnBx(x=0,0.05,0.1,0.15,0.20)高熵合金,然后对合金的微观组织及其力学性能进行测试。结果表明,未加入B元素时,合金组织具有单一FCC结构。当B含量≥0.05at%时,组织由基体FCC相+B2Co3组成;当B含量从0.05at%增加到0.20at%时,该合金的硬度逐渐增加,B含量为0.20at%时,该合金的硬度达到最大,为274HV。

FeCoNiMnBx (x=0,0.0 5,0.1,0.15,0.20) high-entropy alloy was prepared by vacuum arc melting furnace, and the microstructure and mechanical properties of the alloy were tested. The results show that when B element is not added, the alloy structure has a single FCC structure. When B content is more than 0.05at%, the structure is composed of FCC matrix phase+B2Co3. With the increase of B content (from 0.05at% to 0.20at%), the microhardness of the alloy increases gradually. When the boron content is 0.20at%, the microhardness of the alloy reaches the maximum of 274 HV.