B含量对FeCrCoNiMn高熵合金组织及力学性能的影响

采用真空电弧熔炼炉制备了FeCrCoNiMnBx高熵合金,并对其微观组织和力学性能进行测试。未加入B元素时,合金组织具有单一FCC结构的胞状晶。B含量≥0.05时(at%),组织由FCC结构和具有树枝状和纳米颗粒状(Cr,Fe)₂B组成。随B含量的增加,合金的抗拉强度逐渐增加,硼含量为0.2(at%)时,合金的抗拉强度达到最大值610 MPa,但延伸率只有7%。B含量为0.1时,合金的综合力学性能最佳,抗拉强度为550MPa,延伸率为20%。故加入适量的B元素能提高高熵合金综合力学性能。

Effect of Boron on the Microstructure and Mechanical Property of FeCrCoNiMn High-Entropy Alloy

FeCrCoNiMnBx (x=0, 0.05, 0.1, 0.15, 0.2 where, x is the mole percentage) were prepared by vacuum arc melting.The microstructure and mechanical property of FeCrCoNiMnBx high-entropy alloys were investigated.The results show thatwithout boron addition, the alloy is composed of simple fcc solid solution structure and the cellular crystal structures form . When the content of B in the alloys was higher than 0.05, (Fe, Co) 2B with shape of dendritic and nano granular can be observed. With the increase of B content, the tensile strength of the alloy increases gradually. When the content of boron is 0.2, the tensile strength of the alloy is 610 MPa, but the elongation is only 7%. The proper amount of B element can improve the comprehensive mechanical properties of high entropy alloy.When the content of B is 0.1, the tensile strength is 550 MPa, and the elongation is 20%._{proper amount of B element can improve the comprehensive mechanical properties of high entropy alloy.When the content of B is 0.1, the tensile strength is 550 MPa, and the elongation is 20%.}