LAUSR

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)由于其在恶劣环境中优异的力学性能引起了研究者的广泛关注. 我们将高熵合金NbMoTaW引入到纳米叠层材料中, 制备出等层厚的Cu/HEA纳米多层膜, 综合研究了其具有尺寸效应的力学性能及变形行为. 实验表明, Cu/HEA纳米多层膜的硬度随着层厚 h 的减小而增加, 随后在 h ≤50 nm的区域到达一个平台, 而应变速率敏感性出现了一个最大值, 这是由于Cu和HEA两相对应变速率敏感性的影响从协同转变为竞争. 在层厚较大时, 非共格界面导致Cu/HEA多层膜在变形后出现了剪切带, 并且软相Cu层主导变形.