[1]吴长军,熊 伟,周 琛,等.退火温度对共晶和单相Al-Co-Cr-Fe-Ni高熵合金显微组织及硬度的影响[J].常州大学学报(自然科学版),2021,33(03):1-8.[doi:10.3969/j.issn.2095-0411.2021.03.001]
　WU Changjun,XIONG Wei,ZHOU Chen,et al.Effect of Annealing Temperature on Microstructure and Hardness of the Al-Co-Cr-Fe-Ni High Entropy Alloys with Eutectic Structure and Single Phase[J].Journal of Changzhou University(Natural Science Edition),2021,33(03):1-8.[doi:10.3969/j.issn.2095-0411.2021.03.001]
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退火温度对共晶和单相Al-Co-Cr-Fe-Ni高熵合金显微组织及硬度的影响()
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常州大学学报(自然科学版)[ISSN:2095-0411/CN:32-1822/N]

卷:
第33卷
期数:
2021年03期
页码:
1-8
栏目:
材料科学与工程
出版日期:
2021-05-28

文章信息/Info

Title:
Effect of Annealing Temperature on Microstructure and Hardness of the Al-Co-Cr-Fe-Ni High Entropy Alloys with Eutectic Structure and Single Phase
文章编号:
2095-0411(2021)03-0001-08
作者:
吴长军;  熊 伟;  周 琛;  刘 亚;  苏旭平
(江苏省材料表面科学与技术重点实验室(常州大学), 江苏 常州213164; 常州大学 材料科学与工程学院, 江苏 常州 213164)
Author(s):
WU Changjun;  XIONG Wei;  ZHOU Chen;  LIU Ya;  SU Xuping
(Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China; School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China)
关键词:
Al-Co-Cr-Fe-Ni;  高熵合金;  退火处理;  共晶;  显微组织
Keywords:
Al-Co-Cr-Fe-Ni;  high-entropy alloy;  annealing treatment;  eutectic;  microstructure
分类号:
TG 113.12
DOI:
10.3969/j.issn.2095-0411.2021.03.001
文献标志码:
A
摘要:
采用电弧熔炼法制备了4个铸态为FCC+B2共晶组织和B2单相的Al-Co-Cr-Fe-Ni高熵合金, 分析了其相变点, 并研究了600, 800, 1 000 ℃下真空退火10 d对这些合金显微组织及硬度的影响。研究表明: AlCoCrFeNi2.1和Al0.75Co1.25CrFeNi合金的共晶反应温度分别为1 344 ℃和1 359 ℃。600～1 000 ℃退火10 d对AlCoCrFeNi2.1高熵合金的显微组织无明显影响; 而随着退火温度的增加, Al0.75Co1.25CrFeNi合金中共晶组织的两相层片间距增加。随着Al含量的增加, AlxCo2-xCrFeNi合金的B2相稳定性增加, 合金的固相线温度明显升高, 显微硬度也明显增加。铸态为B2单相的AlCoCrFeNi合金加热到605.7 ℃以上会转变为组织细小的FCC+B2+σ三相; 继续加热到906.8 ℃以上, σ相消失, FCC相呈大块状分布。而Al1.75Co0.25CrFeNi合金需要加热到982.4 ℃以上才会分解为两种不同成分的B2相。实验发现: 退火温度越高, 合金的显微硬度越低, 这些合金在800 ℃以下都具有较高的硬度。
Abstract:
Four Al-Co-Cr-Fe-Ni high entropy alloys, which have FCC+B2 eutectic structure or B2 single phase in as-cast state, were melted by arc melting. The phase transformation point was firstly examined. The effect of annealing temperature at 600 ℃, 800 ℃ and 1000 ℃ for 10 days on microstructure and hardness of these alloys were studied.The experimental results showed that the FCC+B2 eutectic reaction temperatures for the AlCoCrFeNi2.1 and Al0.75Co1.25CrFeNi alloys are 1 344 ℃ and 1 359 ℃, respectively. Annealing at 600-1 000 ℃ for 10 days had no obvious effect on the microstructure of AlCoCrFeNi2.1 high entropy alloy, but with the increase of annealing temperature, the lamellar spacing between FCC and B2 phases in eutectic structure of Al0.75Co1.25CrFeNi alloy increased. With the increase of Al content, the phase stability of B2 phase in the AlxCo2-xCrFeNi alloys increased, and the solidus temperature and microhardness of these alloy increased obviously. When the as-cast AlCoCrFeNi alloy was heated above 605.7 ℃, it would turn into FCC + B2 + σ three-phase, but the microstructure was very fine. When heated up to above 906.8 ℃, the σ phase disappeared, and FCC phase was massive. However, Al1.75Co0.25CrFeNi alloy needed to be heated above 982.4 ℃ to decompose into two different B2 phases. It was found that the higher the annealing temperature, the lower the microhardness of the alloy. All these alloys have high hardness below 800 ℃.

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备注/Memo

备注/Memo:
收稿日期:2020-12-30。
基金项目:国家自然科学基金资助项目(51771035); 江苏省自然科学基金资助项目(BK20161190)。
作者简介:吴长军(1985-), 男, 苗族, 湖南凤凰人, 博士, 副教授。E-mail: wucj@cczu.edu.cn
更新日期/Last Update: 1900-01-01