Abstract Equiatomic CrMnFeCoNi high-entropy alloy (HEA) known as Cantor alloy was extensively studied because of intriguing mechanical properties and fracture toughness. However, the HEA exhibits relatively low yield strength due to its intrinsic face-centered cubic lattice structure. In the present letter, crystalline/amorphous dual-phase CrMnFeCoNi alloy was deposited via magnetron sputtering technique. NC HEA with grain size of only ~7.2 nm was derived from low temperature annealing. The hardness reaches to 13.76 GPa, which is the maximum ever reported for CrMnFeCoNi HEA, and the contributions of the NC HEA microstructural characteristics to the ultra-high hardness were revealed. It was proposed that the quasi-dislocation-free crystalline structures and fully relaxed grain boundaries result in the significantly enhanced hardening and thermostability derived in the annealed NC HEA.

中文翻译：

---

超强纳米结构CrMnFeCoNi高熵合金

摘要 等原子 CrMnFeCoNi 高熵合金 (HEA) 被称为 Cantor 合金，由于其有趣的机械性能和断裂韧性而被广泛研究。然而，由于其固有的面心立方晶格结构，HEA 表现出相对较低的屈服强度。在本文中，晶体/非晶双相 CrMnFeCoNi 合金是通过磁控溅射技术沉积的。晶粒尺寸仅为 ~7.2 nm 的 NC HEA 来自低温退火。硬度达到 13.76 GPa，这是 CrMnFeCoNi HEA 有史以来报告的最大值，并且揭示了 NC HEA 显微结构特征对超高硬度的贡献。