热处理对双FCC相CoCrFeNiCu高熵合金组织与性能的影响

doi:10.13251/j.issn.0254-6051.2021.02.028

金属热处理 ›› 2021, Vol. 46 ›› Issue (2): 157-160.DOI: 10.13251/j.issn.0254-6051.2021.02.028

热处理对双FCC相CoCrFeNiCu高熵合金组织与性能的影响

张骁, 刘亮, 商剑, 赵作福, 张越, 齐锦刚, 王冰

辽宁工业大学材料科学与工程学院, 辽宁锦州 121001

收稿日期:2020-07-22 出版日期:2021-02-25 发布日期:2021-05-08
通讯作者: 刘亮,副教授,博士,E-mail:liuliang@lnut.edu.cn
作者简介:张骁(1996—),男,硕士研究生,主要研究方向为高熵合金,E-mail:zhangxiao961228@163.com。
基金资助:
国家自然科学基金青年基金(51601086)

Effect of heat treatment on microstructure and properties of dual FCC-phase CoCrFeNiCu high entropy alloy

Zhang Xiao, Liu Liang, Shang Jian, Zhao Zuofu, Zhang Yue, Qi Jingang, Wang Bing

Department of Materials Science and Engineering, Liaoning University of Technology, Jinzhou Liaoning 121001, China

Received:2020-07-22 Online:2021-02-25 Published:2021-05-08

摘要/Abstract

摘要： 用真空感应熔炼法制备了CoCrFeNiCu高熵合金,研究了不同退火温度对合金组织及力学性能的影响。结果表明,铸态CoCrFeNiCu合金具有双FCC相结构,分别为富Cu相和贫Cu相,而且相分离现象随热处理温度的升高逐渐明显。铸态合金的组织形貌为典型树枝晶组织,随热处理温度的升高,富铜相增多,枝晶间隙变宽,且出现了大量纳米颗粒。经600 ℃退火处理后,合金的屈服强度和断裂强度显著提高,屈服强度达到233 MPa,断裂强度接近铸态合金的3倍,并且伸长率无明显降低。

关键词: 高熵合金, 热处理, 双FCC相, 显微组织, 力学性能

Abstract: CoCrFeNiCu high entropy alloy was prepared by vacuum induction melting, and the effects of different annealing temperatures on microstructure and mechanical properties were studied. The results show that the as-cast CoCrFeNiCu alloy has a dual FCC-phase crystal structure, which are copper-rich phase and copper-dilute phase, respectively. The phase separation is gradually obvious as the heat treatment temperature increases. The microstructure of the as-cast alloy is a typical dendritic structure, and as the heat treatment temperature increases, the copper-rich phase increases, and the interdendritic region becomes wider, in which a large number of nanoparticles are precipitated. After heat treatment at 600 ℃, the yield and fracture strength of CoCrFeNiCu alloy are significantly improved, the yield strength reaches 233 MPa, and the fracture strength is close to 3 times of the as-cast alloy, however, the elongation of the alloy is basically unchanged.

Key words: high entropy alloy, heat treatment, dual FCC-phase, microstructure, mechanical properties

中图分类号:

TG142.1

张骁, 刘亮, 商剑, 赵作福, 张越, 齐锦刚, 王冰. 热处理对双FCC相CoCrFeNiCu高熵合金组织与性能的影响[J]. 金属热处理, 2021, 46(2): 157-160.

Zhang Xiao, Liu Liang, Shang Jian, Zhao Zuofu, Zhang Yue, Qi Jingang, Wang Bing. Effect of heat treatment on microstructure and properties of dual FCC-phase CoCrFeNiCu high entropy alloy[J]. Heat Treatment of Metals, 2021, 46(2): 157-160.

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热处理对双FCC相CoCrFeNiCu高熵合金组织与性能的影响

Effect of heat treatment on microstructure and properties of dual FCC-phase CoCrFeNiCu high entropy alloy

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