Nanostructured Oxide‐Dispersion‐Strengthened CoCrFeMnNi High‐Entropy Alloys with High Thermal Stability
Nanostructured Oxide‐Dispersion‐Strengthened CoCrFeMnNi High‐Entropy Alloys with High Thermal Stability
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DOI：
10.1002/adem.202100291
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发表时间：
2021-07
影响因子：
3.6
通讯作者：
Xiang Zhang;Fei Wang;Xueliang Yan;X. Li;K. Hattar;B. Cui
中科院分区：
文献类型：
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作者：
Xiang Zhang;Fei Wang;Xueliang Yan;X. Li;K. Hattar;B. Cui
采用粉末冶金法合成了纳米结构氧化物弥散强化（ODS）CoCrFeMnNi高熵合金（HEA）。热稳定性，包括HEA基质和氧化物分散体的晶粒尺寸和晶体结构，在900 °C退火后通过X射线衍射（XRD）和电子显微镜表征进行仔细研究。有限的晶粒生长可能是由于齐纳钉扎的氧化钇分散体，阻碍晶界的流动性和扩散。高硬度是由细晶粒尺寸和氧化钇分散体引起的，其在900 °C下退火后也被保留。在这里，这意味着ODS和HEA概念的组合可能会提供一个新的设计策略，为极端环境下的热稳定的纳米结构合金的发展。
A nanostructured oxide‐dispersion‐strengthened (ODS) CoCrFeMnNi high‐entropy alloy (HEA) is synthesized by a powder metallurgy process. The thermal stability, including the grain size and crystal structure of the HEA matrix and oxide dispersions, is carefully investigated by X‐ray diffraction (XRD) and electron microscopy characterizations after annealing at 900 °C. The limited grain growth may be attributed to Zener pinning of yttria dispersions that impede the grain boundary mobility and diffusivity. The high hardness is caused by both the fine grain size and yttria dispersions, which are also retained after annealing at 900 °C. Herein, it is implied that the combination of ODS and HEA concepts may provide a new design strategy for the development of thermally stable nanostructured alloys for extreme environments.