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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 2/2022

20-09-2021

Effect of Annealing Treatment on the Microstructure and Hardness of AlxCoCrFeNi (x = 0.75, 1.25) High Entropy Alloys

Authors: Min Liu, Shidong Zhang, Fangjie Li, Lianbo Wang, Zemin Wang, Zhanyong Wang, Yeyu Sha, Qin Shen

Published in: Journal of Materials Engineering and Performance | Issue 2/2022

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Abstract

Two AlxCoCrFeNi (x = 0.75, 1.25) high entropy alloys (HEAs) were prepared and annealed with different temperatures (800, 1000 and 1200 °C) and holding times (2 h, 4 h and 8 h) using furnace cooling. Effects of annealing treatment details on the microstructure and hardness of the HEAs were investigated. It was found that the σ-phase did not form in the Al0.75CoCrFeNi alloy for whatever annealing temperatures or holding times. The σ-phase was produced at 610 °C and dissolved at 930 °C in the Al1.25CoCrFeNi alloy. After dissolution, the σ-phase could reappear when this alloy furnace cooled from higher annealed temperature (1200 °C for 4 h) or longer duration time (1000 °C for 8 h). The reason is that the redistribution of Cr element in the post-holding stage or furnace cooling stage was sufficient to precipitate σ-phase. The formation and dissolution of σ-phase and their influences on the hardness in the HEAs were analyzed and discussed thoroughly.
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Metadata
Title
Effect of Annealing Treatment on the Microstructure and Hardness of AlxCoCrFeNi (x = 0.75, 1.25) High Entropy Alloys
Authors
Min Liu
Shidong Zhang
Fangjie Li
Lianbo Wang
Zemin Wang
Zhanyong Wang
Yeyu Sha
Qin Shen
Publication date
20-09-2021
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 2/2022
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-021-06240-y

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