A Y₂O₃-reinforced equiatomic CrMnFeCoNi high-entropy alloy (HEA) matrix nanocomposite was fabricated by high-energy attrition milling and selective laser melting (SLM) additive manufacturing. The SLM-built HEA nanocomposite possessed heterogeneous grain structures and substructures decorated with a dislocation network and exhibited a high number density of nano-sized Y₂O₃. The SLM-built HEA + Y₂O₃ nanocomposite exhibited higher nanohardness (~9.22 GPa) than other equiatomic CrMnFeCoNi HEAs produced by casting (~4.13 GPa) and SLM (~6.95 GPa). This suggested that the dispersion hardening by the Y₂O₃ nanoparticles enabled superior mechanical properties. This study, therefore, demonstrated that Y₂O₃ reinforcement can effectively improve the mechanical properties of SLM-built CrMnFeCoNi HEA matrix nanocomposites.

AY ₂ O ₃增强等原子的CrMnFeCoNi 高熵合金(HEA) 基体纳米复合材料是通过高能磨削和选择性激光熔化(SLM) 增材制造制造的。SLM 构建的 HEA 纳米复合材料具有异质晶粒结构和用位错网络装饰的亚结构，并表现出高数量密度的纳米级 Y ₂ O ₃。SLM 构建的 HEA + Y ₂ O ₃纳米复合材料表现出比通过铸造 (~4.13 GPa) 和 SLM (~6.95 GPa) 生产的其他等原子 CrMnFeCoNi HEA更高的纳米硬度 (~9.22 GPa)。这表明 Y ₂ O ₃的弥散硬化纳米粒子具有优异的机械性能。因此，本研究表明，Y ₂ O ₃增强材料可以有效提高 SLM 构建的 CrMnFeCoNi HEA 基纳米复合材料的机械性能。