Here, we architected a duplex heterostructure with FCC/L1₂ and B2 phases in Ni₄₉Fe₂₈Al₁₇V₆ eutectic high-entropy alloy (EHEA) by thermal-mechanical process. Ultra-high yield strength of ∼1550 MPa, high tensile strength of ∼1772 MPa and good ductility of ∼16.5% at room temperature (298 K) were exhibited. Particularly, ultra-high yield strength of ∼1877 MPa, ultra-high tensile strength of ∼2157 MPa and uniform elongation of ∼10% were achieved at cryogenic temperature (77 K). Such excellent room-temperature mechanical properties are attributed to the hetero-deformation induced (HDI) hardening. Ultrahigh cryogenic-temperature strength originates from not only HDI hardening, but also the strong interaction of deformation twins and high-density dislocations.

中文翻译：

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在室温和低温下具有双相异质结构的共晶高熵合金的超高强度和延展性


在这里，我们通过热机械工艺在 Ni₄₉Fe₂₈Al₁₇V₆ 共晶高熵合金 （EHEA） 中构建了一个具有 FCC/L1₂ 和 B2 相的双相异质结构。在室温 （298 K） 下表现出 ∼1550 MPa 的超高屈服强度、∼1772 MPa 的高拉伸强度和 ∼16.5% 的良好延展性。特别是在低温 （77 K） 下实现了 ∼1877 MPa 的超高屈服强度、∼2157 MPa 的超高拉伸强度和 ∼10% 的均匀伸长率。如此优异的室温机械性能归因于异质变形诱导 （HDI） 硬化。超高低温强度不仅源于 HDI 硬化，还源于变形孪晶和高密度位错的强烈相互作用。