A promising strategy involving the synergetic effects of the high-entropy engineering and interface architectures has been proposed to realize the thermal stability of nanocrystalline alloys. A bulk dual-phase nanocrystalline (DPNC-) AlCoCuNi medium-entropy alloy was prepared by mechanical alloying (MA) and spark plasma sintering (SPS) process. These DPNC structures include Cu-rich and AlCoNi-rich nanocrystallines (NCs) with an average grain size of 46 nm. This DPNC-AlCoCuNi material could maintain the nanostructures as well as a high hardness of about 580 HV even after annealing at 900 °C for 50 h. The extremely high thermal stability has been attributed to the extensive thermal-stabled low-energy phase boundaries, low-angle grain boundaries, the high-entropy and sluggish diffusion effects.

提出了一种涉及高熵工程和界面结构协同效应的有前途的策略，以实现纳米晶合金的热稳定性。通过机械合金化（MA）和火花等离子体烧结（SPS）工艺制备了块状双相纳米晶（DPNC-）AlCoCuNi中熵合金。这些DPNC结构包括平均晶粒尺寸为46 nm的富含Cu和AlCoNi的纳米晶体（NC）。即使在900°C退火50 h后，这种DPNC-AlCoCuNi材料仍可以保持纳米结构以及约580 HV的高硬度。极高的热稳定性归因于广泛的热稳定低能相界，低角度晶界，高熵和缓慢的扩散效应。