Abstract Most of multi-component high entropy alloys (HEAs) are only based on metal elements and rarely added with nonmetallic elements. In present paper, CoCrFeNiMn HEA added with 0.1 at.% N has been successfully synthesized by mechanical alloying (MA) followed by vacuum hot pressing sintering (VHPS). During the MA process, the alloying elements were gradually alloyed and formed as face-center (FCC) solid solutions. Subsequently, σ phases, Cr2N phases, FCC matrix phases with traces of Cr23C6 carbides were observed after VHPS. In comparison with CoCrFeNiMn HEA produced by the same method, the Vickers hardness increased up to 468HV, while the yield stress, ultimate compressive strength increased by 203 MPa and 115 MPa respectively, accompanied by a small decrease in plasticity. This demonstrates that adding N element is a viable approach for properties enhancement of HEAs.

中文翻译：

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N添加对机械合金化和真空热压烧结CoCrFeNiMn高熵合金组织和力学性能的影响

摘要 多组分高熵合金（HEAs）大多仅以金属元素为主，很少添加非金属元素。在本文中，通过机械合金化 (MA) 和真空热压烧结 (VHPS) 成功合成了添加 0.1 at.% N 的 CoCrFeNiMn HEA。在 MA 过程中，合金元素逐渐合金化并形成面心 (FCC) 固溶体。随后，在 VHPS 后观察到 σ 相、Cr2N 相、带有痕量 Cr23C6 碳化物的 FCC 基体相。与同样方法生产的CoCrFeNiMn HEA相比，维氏硬度增加到468HV，而屈服应力、极限抗压强度分别增加了203 MPa和115 MPa，塑性略有下降。