High entropy alloys (HEAs) have attracted extensive attention due to their excellent properties in harsh environments. Here, we introduced the HEA NbMoTaW into the laminated structure to synthesize the Cu/HEA nanolami-nates (NLs) with equal layer thickness h spanning from 5 to 100 nm, and comparatively investigated the size dependent mechanical properties and plastic deformation. The experimental results demonstrated that the hardness of Cu/HEA NLs increased with decreasing h, and reached a plateau at h ≤ 50 nm, while the strain rate sensitivity m unexpectedly went through a maximum with reducing h. The emergence of maximum m results from a transition from the synergetic effect of crystalline constituents to the competitive effect between crystalline Cu and amorphous-like NbMoTaW. Micro-structural examinations revealed that shear banding caused by the incoherent Cu/HEA interfaces occurred under severe deformation, and the soft Cu layers dominated plastic deformation of Cu/HEA NLs with large h.

高熵合金（HEA）由于其在恶劣环境下的优异性能而受到广泛关注。在这里，我们将HEA NbMoTaW引入到层状结构中，以合成层厚h介于5到100 nm之间的Cu / HEA纳米薄片（NLs），并比较研究了尺寸依赖性的机械性能和塑性变形。实验结果表明，铜/ HEA NLS的硬度随增加ħ，并达到在高原ħ ≤50纳米，而应变率敏感性米意外通过最大去与减少ħ。最大m的出现结果从晶体成分的协同效应过渡到晶体Cu与非晶态NbMoTaW之间的竞争效应。微观结构检查表明，由Cu / HEA界面不相干引起的剪切带在严重变形下发生，而软Cu层主导了h较大的Cu / HEA NLs的塑性变形。