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研究微量硼元素对AlCoCrFeNiBx(x=0,0.01,0.02…0.09,0.10,x为摩尔分数)高熵合金微观组织和性能的影响。AlCoCrFeNi高熵合金呈现典型的等轴晶结构,晶内伴随着明显的成分偏析。然而,随着硼元素的添加,合金呈现明显的树枝晶结构。在树枝晶内可以观察到典型的调幅分解结构。晶体结构也随着硼元素的增加由B2+BCC结构转变为B2+BCC+FCC的混合结构;合金硬度呈先升后降趋势,由HV 486.7升高至HV 502.4,最后降低至HV 460.7;压缩断裂强度在x=0.08前呈上升趋势,之后呈下降趋势;合金呈软磁性,其矫顽力和饱和磁化强度均随着硼元素含量增加而下降,表明硼元素对合金软磁性有提高作用。
The effect of trace boron on the microstructure and properties of high-entropy alloys with AlCoCrFeNiBx (x = 0,0.01,0.02,0.09,0.10, x = mole fraction) was studied. AlCoCrFeNi high-entropy alloy presents a typical equiaxed crystal structure, accompanied by significant segregation of crystals. However, with the addition of boron, the alloy showed obvious dendritic structure. In the dendrite can be observed within a typical amplitude modulation decomposition structure. The crystal structure also changed from B2 + BCC structure to B2 + BCC + FCC mixed structure with the increase of boron element. The hardness of alloy increased first and then decreased from HV 486.7 to HV 502.4 and finally decreased to HV 460.7. The fracture strength showed an upward trend before x = 0.08, and then decreased. The alloy was soft magnetic and its coercivity and saturation magnetization decreased with the increase of boron content, which indicated that boron could improve the soft magnetic properties of the alloy.