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材料导报  2020, Vol. 34 Issue (17): 17067-17071    https://doi.org/10.11896/cldb.19120159
  高熵合金 |
CoxMn2-xCrFeNi高熵合金的相稳定性
田梦云1, 吴长军1,2, 刘亚1,2, 彭浩平1, 王建华1,2, 苏旭平1,2
1 常州大学材料科学与工程学院,江苏省材料表面科学与技术重点实验室,常州 213164
2 常州大学光伏科学与工程江苏协同创新中心,常州 213164
Phase Stability of the CoxMn2-xCrFeNi High Entropy Alloys
TIAN Mengyun1, WU Changjun1,2, LIU Ya1,2, PENG Haoping1, WANG Jianhua1,2, SU Xuping1,2
1 Jiangsu Key Laboratory of Materials Surface Science and Technology, School of Materials Science and Engineering, Changzhou University,Changzhou 213164,China
2 Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, China
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摘要 本工作通过磁控电弧炉制备了一系列CoxMn2-xCrFeNi(x=0.25—1.75)高熵合金,并利用XRD、SEM、EDS、DSC等手段研究了这些合金在铸态、800 ℃和1 000 ℃退火720 h后的相稳定性。研究发现,Co含量不低于15%(原子分数)的CoxMn2-xCrFeNi合金在铸态及800 ℃和1 000 ℃退火720 h后均为FCC单相。铸态Co0.25Mn1.75CrFeNi为FCC+BCC两相,但经800 ℃或1 000 ℃退火720 h后,该合金中的BCC相消失,Cr元素富集,转变为FCC+σ相。在800 ℃退火720 h后的Co0.5Mn1.5CrFeNi不仅从FCC基体中析出了σ相,还析出了富Cr的BCC相。DSC测试表明,FCC相的开始熔化温度随Co含量的增加而升高;σ相将在1 097~1 120 ℃分解。此外,基于TCFE数据库的热力学计算结果表明,虽然通过计算可以较准确地预测FCC相的稳定性,但是不能准确地预测BCC相和σ相的稳定性。也就是说,Co-Cr-Fe-Mn-Ni体系中σ相和BCC相的热力学模型参数还需要进一步优化。
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田梦云
吴长军
刘亚
彭浩平
王建华
苏旭平
关键词:  Co-Cr-Fe-Ni-Mn  高熵合金  退火  相稳定性  σ相    
Abstract: The phase stability of arc-melted CoxMn2-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 CoxMn2-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 Co0.25Mn1.75CrFeNi 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 Co0.5Mn1.5CrFeNi 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
               出版日期:  2020-09-10      发布日期:  2020-09-02
ZTFLH:  TG113.12  
基金资助: 国家自然科学基金(51771035;51671036)
通讯作者:  wucj@cczu.edu.cn   
作者简介:  田梦云,常州大学材料科学与工程学院硕士研究生。在吴长军副教授指导下进行研究。目前主要研究领域为高性能金属材料。
吴长军,常州大学材料科学与工程学院副教授,硕士研究生导师。2011年6月毕业于湘潭大学,获工学博士学位;2015—2016年在韩国浦项科技大学进行博士后研究工作。主要从事高性能金属材料、合金相图及材料设计、材料表面处理等方面的研究。近年来,先后发表SCI/EI收录论文40余篇,曾获教育部科技进步二等奖。
引用本文:    
田梦云, 吴长军, 刘亚, 彭浩平, 王建华, 苏旭平. CoxMn2-xCrFeNi高熵合金的相稳定性[J]. 材料导报, 2020, 34(17): 17067-17071.
TIAN Mengyun, WU Changjun, LIU Ya, PENG Haoping, WANG Jianhua, SU Xuping. Phase Stability of the CoxMn2-xCrFeNi High Entropy Alloys. Materials Reports, 2020, 34(17): 17067-17071.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.19120159  或          http://www.mater-rep.com/CN/Y2020/V34/I17/17067
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