A nanocrystalline AlCoCuNi medium-entropy alloy with high thermal stability via entropy and boundary engineering
A nanocrystalline AlCoCuNi medium-entropy alloy with high thermal stability via entropy and boundary engineering
复制标题
通过熵和边界工程获得具有高热稳定性的纳米晶 AlCoCuNi 中熵合金
DOI：
10.1016/j.msea.2020.138925
复制
发表时间：
2020-02-13
期刊：
影响因子：
6.4
通讯作者：
Xiong, Y.
中科院分区：
文献类型：
--
作者：
Deng, H. W.;Xie, Z. M.;Xiong, Y.
高熵工程和界面结构的协同效应是实现纳米晶合金热稳定性的一个很有前途的策略。采用机械合金化（MA）和放电等离子烧结（SPS）工艺制备了块体双相纳米晶AlCoCuNi中熵合金。这些DPNC结构包括富Cu和富AlCoNi的纳米微晶（NC），平均晶粒尺寸为46 nm。这种DPNC-AlCoCuNi材料即使在900 ℃退火50 h后也可以保持纳米结构以及约580 HV的高硬度。这种极高的热稳定性是由于广泛的热稳定低能相界、小角度晶界、高熵和缓慢的扩散效应。
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 degrees 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.