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29.12.2022 | Original Article

Local chemical ordering coordinated thermal stability of nanograined high-entropy alloys

verfasst von: Hong-Hui Wu, Lin-Shuo Dong, Shui-Ze Wang, Gui-Lin Wu, Jun-Heng Gao, Xu-Sheng Yang, Xiao-Ye Zhou, Xin-Ping Mao

Erschienen in: Rare Metals | Ausgabe 5/2023

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Abstract

Nanograined (NG) materials often suffer from low thermal stability owing to the high volume fraction of grain boundaries (GBs). Herein, we investigate the possibility of utilizing local chemical ordering (LCO) for improving the thermal stability of NG FeCoNiCrMn high-entropy alloys (HEAs). NG HEAs with two different grain sizes were considered. Tensile tests and creep test simulations were then performed to reveal the influence of LCO on the mechanical properties and thermal stability of NG HEAs. After performing hybrid molecular dynamics and Monte Carlo simulations, Cr atoms were found to accumulate at GBs. By analyzing the atomic structure evolution during the deformation process, we found that the formation of LCO effectively stabilized the GBs and inhibited GB movement. In addition, dislocation nucleation from GBs and dislocation movement was also hindered. The inhibiting effect of LCO on GB movement and dislocation activity is more prominent than in the NG model with smaller grain sizes. The current simulation results suggest a possible strategy for enhancing the thermal stability of NG HEAs for service in a high-temperature environment.

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Vorheriger Artikel Enhanced electromagnetic wave absorption properties of ZIF-67 modified polymer-derived SiCN ceramics by in situ construction of multiple heterointerfaces

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Titel: Local chemical ordering coordinated thermal stability of nanograined high-entropy alloys
verfasst von: Hong-Hui Wu
Lin-Shuo Dong
Shui-Ze Wang
Gui-Lin Wu
Jun-Heng Gao
Xu-Sheng Yang
Xiao-Ye Zhou
Xin-Ping Mao
Publikationsdatum: 29.12.2022
Verlag: Nonferrous Metals Society of China
Erschienen in: Rare Metals / Ausgabe 5/2023
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-022-02194-9

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