The effect of C-alloying on phase constituent, microstructure and mechanical behaviour of a novel Co-free (Fe36Mn36Ni9Cr9Al10)100-x C x (x = 0, 1.5, 2.5, 3.5, 5, 6) low-cost high entropy alloy (HEA) system was investigated. Addition of carbon promoted the transformations of BCC and B2 phase in the original C-free HEA into FCC phase. At a carbon content of 2.5 at.-% and beyond, hardly BCC phase constituent can be obtained. Optimised mechanical properties with a yield strength of 387 MPa, tensile strength of 741 MPa along with excellent ductility of 57% were achieved at a carbon content of 2.5 at.-%. The improvement in mechanical properties of the (Fe36Mn36Ni9Cr9Al10)97.5C2.5 HEA can be ascribed to enhance the work hardening ability originated from microband-induced plasticity effect.

中文翻译：

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碳对Fe36Mn36Ni9Cr9Al10高熵合金组织和力学性能的影响

C-合金化对新型无 Co (Fe36Mn36Ni9Cr9Al10)100-x C x (x = 0, 1.5, 2.5, 3.5, 5, 6) 低成本高熵合金的相组成、微观结构和力学行为的影响 ( HEA) 系统进行了研究。碳的加入促进了原始无碳 HEA 中 BCC 和 B2 相向 FCC 相的转变。在 2.5 at.-% 及以上的碳含量下，几乎无法获得 BCC 相成分。在 2.5 at.-% 的碳含量下实现了优化的机械性能，屈服强度为 387 MPa，拉伸强度为 741 MPa，延展性为 57%。(Fe36Mn36Ni9Cr9Al10)97.5C2.5 HEA 力学性能的改善可归因于微带诱导塑性效应引起的加工硬化能力增强。