CoxMn2-xCrFeNi高熵合金的相稳定性

doi:10.11896/cldb.19120159

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Abstract The phase stability of arc-melted Co_xMn_2-xCrFeNi (x=0.25—1.75) high entropy alloys in as-cast and 800 ℃ or 1 000 ℃ annealed states were investigated using XRD, SEM, EDS, and DSC. It was found that the Co_xMn_2-xCrFeNi alloy with more than 15at% Co had a FCC single phase in as-cast state or after annealing at 800 ℃ or 1 000 ℃ for 720 h. The as-cast Co_0.25Mn_1.75CrFeNi alloy was composed of FCC+BCC two-phase. However, after annealing at 1 000 ℃ or 800 ℃ for 720 h, the BCC phase disappeared, and the Cr element enriched and transformed into FCC+σ phases. In 800 ℃ annealed Co_0.5Mn_1.5CrFeNi alloy, not only σ phase but also Cr-rich BCC phase was precipitated from the as-cast FCC matrix. DSC measurements showed that the transition point of FCC phase increased with the increasing of Co content, and the σ phase would decompose at 1 097—1 120 ℃. In addition, although thermodynamic calculation based on TCFE database could accurately predict the stability of FCC phase, it could not accurately predict the stability of BCC phase and σ phase. That is to say, the thermodynamic parameters of the σ and BCC phases in Co-Cr-Fe-Mn-Ni system still need to be further optimized.

Key words： Co-Cr-Fe-Ni-Mn high entropy alloys annealing phase stability σ phase

Published: 02 September 2020

CLC number:

TG113.12

Fund:National Natural Science Foundation of China (51771035, 51671036)

About author:: Mengyun Tian is currently pursuing her master degree at School of Material Science and Engineering of Changzhou University under the supervision of associate Prof. Changjun Wu. Her research mainly focuses on high performance metal material.
Changjun Wu, School of Materials Science and Engineering, Changzhou University. He received his Ph. D. degree from Xiangtan University in June 2011. He used to work as a postdoctor in Pohang University of Science and Technology, Korea, in 2015—2016. His research interests are high performance metal materials, alloy phase diagram, material design and material surface treatment. Recently, he has published more than 40 SCI/EI indexed papers and won the second prize of science and technology progress award of ministry of education.

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	TIAN Mengyun
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	LIU Ya
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	WANG Jianhua
	SU Xuping

Cite this article:

TIAN Mengyun,WU Changjun,LIU Ya, et al. Phase Stability of the Co_xMn_2-xCrFeNi High Entropy Alloys[J]. Materials Reports, 2020, 34(17): 17067-17071.

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http://www.mater-rep.com/EN/10.11896/cldb.19120159 OR http://www.mater-rep.com/EN/Y2020/V34/I17/17067

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