Abstract A high tensile yield strength of 1298 MPa and good ductility (uniform elongation: 9.4%) of CoCrFeNiMn high entropy alloy can be sustained by a multilevel structural heterogeneity facilitated by ultrafine grained regions (UFGRs), coarse grained regions (CGRs) and a non-uniform dispersion of TiO(C) nanoparticles in UFGRs. Analysis reveals that the Young's modulus difference and strain gradient associated with the nanoparticles enhance the back stress. Meanwhile, forward stress was estimated quantitatively, which further suggests that nanoparticles also effectively increase resistance to the forward stress, leading to a better strength–ductility synergy than a simple heterogeneous structure with only UFGRs and CGRs.

中文翻译：

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通过与纳米粒子相关的多级异质性维持 CoCrFeNiMn 高熵合金的强度-延展性协同作用

摘要 CoCrFeNiMn 高熵合金具有 1298 MPa 的高拉伸屈服强度和良好的延展性（均匀伸长率：9.4%），可通过超细晶区 (UFGR)、粗晶区 (CGR) 和非晶区促进的多级结构异质性来维持。 -TiO(C) 纳米粒子在 UFGR 中的均匀分散。分析表明，与纳米颗粒相关的杨氏模量差异和应变梯度增强了背应力。同时，定量估计了前向应力，这进一步表明纳米颗粒还有效地增加了对前向应力的抵抗力，导致比仅具有 UFGR 和 CGR 的简单异质结构更好的强度-延展性协同作用。