Abstract The microstructure and mechanical properties of the as-cast (Fe50Mn30Co10Cr10)100-xCx (x = 0, 0.5, 1, 2, 4, 6 at.%) alloys have been investigated. The results show that at x = 0, the alloy consists of FCC and HCP phases. At x＜4, C is completely dissolved into the as-cast (Fe50Mn30Co10Cr10)100-xCx alloys. The HCP volume fraction decreases and the FCC volume fraction increases with the C content increasing. During tensile process, there is a change from transformation-induced plasticity to twinning-induced plasticity with the increase of C content, resulting in the remarkable improvement of the plasticity. At x = 2, the plastic strain is almost three times larger than that of the Fe50Mn30Co10Cr10 alloy. At x > 4, however, the nano-carbides present and their volume fraction increases with the increase of C content. The carbides and FCC matrix have the eutectic lamellar morphology and coherent relationship. The solid solution strengthening and formation of carbides decrease the plasticity and increase the yield strength.

中文翻译：

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C添加对铸态HEAs(Fe50Mn30Co10Cr10)100-xCx组织和力学性能的影响

摘要 研究了铸态 (Fe50Mn30Co10Cr10)100-xCx (x = 0, 0.5, 1, 2, 4, 6 at.%)合金的组织和力学性能。结果表明，在 x = 0 时，合金由 FCC 和 HCP 相组成。在 x＜4 时，C 完全溶解在铸态 (Fe50Mn30Co10Cr10)100-xCx 合金中。随着C含量的增加，HCP体积分数降低，FCC体积分数增加。在拉伸过程中，随着C含量的增加，由相变诱导塑性向孪生诱导塑性转变，塑性显着提高。在 x = 2 时，塑性应变几乎是 Fe50Mn30Co10Cr10 合金的三倍。然而，当 x > 4 时，纳米碳化物存在并且它们的体积分数随着 C 含量的增加而增加。碳化物和FCC基体具有共晶层状形态和相干关系。固溶强化和碳化物的形成降低了塑性并增加了屈服强度。