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采用XRD、SEM、EDS、硬度测试和压缩试验等方法,研究了Cu含量对FeCoNiAlCu_x高熵合金组织与力学性能的影响。结果表明:FeCoNiAlCu_x合金均由fcc相和bcc相组成,但随着Cu含量的增加,fcc相增多,而bcc相减少;该合金为树枝晶组织,枝晶间存在明显的Cu富集,并且Cu含量的增加加剧了Cu元素在枝晶间的偏聚,但在枝晶内没有变化。同时,Cu含量的增加促进了合金塑性的提高,FeCoNiAlCu_(1.5)合金的压缩应变最大,为36.1%,但是降低了合金的屈服强度和显微硬度;FeCoNiAlCu_(0.5)合金的显微硬度最高,为569 HV;FeCoNiAlCu_(0.8)合金的屈服强度最大,为1256MPa。
The effects of Cu content on microstructure and mechanical properties of FeCoNiAlCu_x high-entropy alloys were studied by XRD, SEM, EDS, hardness test and compression test. The results show that the FeCoNiAlCu_x alloys consist of fcc phase and bcc phase, but the fcc phase increases and the bcc phase decreases with the increase of Cu content. The alloy is dendrite structure with obvious Cu enrichment, and Cu The increase of Cu content aggravates the segregation of Cu in dendrites, but does not change in dendrite. At the same time, the increase of Cu content promoted the plasticity of the alloy. The maximum compressive strain of FeCoNiAlCu_ (1.5) alloy was 36.1%, but the yield strength and microhardness of FeCoNiAlCu_ (0.5) alloy were the highest. 569 HV. The maximum yield strength of FeCoNiAlCu_ (0.8) alloy is 1256 MPa.