间隙元素C对亚稳FeMnCoCrAl系高熵合金组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2025.06.002

金属热处理 ›› 2025, Vol. 50 ›› Issue (6): 6-11.DOI: 10.13251/j.issn.0254-6051.2025.06.002

间隙元素C对亚稳FeMnCoCrAl系高熵合金组织与力学性能的影响

孙小斌, 李杰, 曹炜鹏, 吴凯迪, 冯运莉

华北理工大学冶金与能源学院, 河北唐山 063210

收稿日期:2024-12-05 修回日期:2025-03-07 出版日期:2025-06-25 发布日期:2025-07-08
通讯作者: 李杰,教授,博士,E-mail:lijiemain@163.com
作者简介:孙小斌(1999—),男,硕士研究生,主要研究方向为新型金属材料,E-mail:sxb0506@126.com。
基金资助:
国家自然科学基金(51974134);河北省科技重大专项(21281008Z);唐山市应用基础研究项目(21130237C)

Effect of interstitial element C on microstructure and mechanical properties of metastable FeMnCoCrAl high-entropy alloys

Sun Xiaobin, Li Jie, Cao Weipeng, Wu Kaidi, Feng Yunli

College of Metallurgy and Energy, North China University of Science and Technology, Tangshan Hebei 063210, China

Received:2024-12-05 Revised:2025-03-07 Online:2025-06-25 Published:2025-07-08

摘要/Abstract

摘要： 采用(Fe₅₀Mn₃₀Co₁₀Cr₁₀)₉₆Al₄亚稳高熵合金为基体,添加间隙元素C,制备了不同C含量的(Fe₅₀Mn₃₀Co₁₀Cr₁₀)_96-xAl₄C_x(x=0,0.5,1.0,2.0,原子分数,%)合金。经过热轧、冷轧及退火处理,结合XRD、SEM、EBSD和电子万能试验机等对合金的微观组织演变和力学性能进行研究。结果表明,C元素的引入使得退火态合金在单一面心立方相中析出了M₂₃C₆型碳化物;随着C含量由0%增加到2.0%,M₂₃C₆型碳化物的体积分数逐渐增加,同时合金的平均晶粒尺寸由6.24 μm减小到1.70 μm,合金的屈服强度和抗拉强度均显著提升,而断裂总延伸率相应降低。当C含量为1.0%时,综合力学性能最优,合金的抗拉强度和断裂总延伸率分别为798 MPa 和41.1%。

关键词: 高熵合金, C添加, 组织, 力学性能

Abstract: (Fe₅₀Mn₃₀Co₁₀Cr₁₀)_96-xAl₄C_x(x=0, 0.5, 1.0, 2.0, atom fraction,%) alloys with different C contents were prepared by using (Fe₅₀Mn₃₀Co₁₀Cr₁₀)₉₆Al₄ metastable high-entropy alloy as matrix and adding interstitial element C. After hot rolling, cold rolling and annealing treatment, the microstructure evolution and mechanical properties of the alloy were studied by means of XRD, SEM, EBSD and electronic universal testing machine. The results show that the introduction of C element makes the M₂₃C₆ carbides precipitate in the single face-centered cubic phase of the annealed alloy. As the C content increases from 0% to 2.0%, the volume fraction of M₂₃C₆ carbides increases gradually, and the average grain size of the alloy decreases from 6.24 μm to 1.70 μmm, and the yield strength and tensile strength of the alloy are significantly improved, while the total elongation at fracture decreases accordingly. When the C content is 1.0%, the comprehensive mechanical properties are the best, and the tensile strength and total elongation at fracture of the alloy are 798 MPa and 41.1 %, respectively.

Key words: high-entropy alloys, C addition, microstructure, mechanical properties

中图分类号:

TG139

孙小斌, 李杰, 曹炜鹏, 吴凯迪, 冯运莉. 间隙元素C对亚稳FeMnCoCrAl系高熵合金组织与力学性能的影响[J]. 金属热处理, 2025, 50(6): 6-11.

Sun Xiaobin, Li Jie, Cao Weipeng, Wu Kaidi, Feng Yunli. Effect of interstitial element C on microstructure and mechanical properties of metastable FeMnCoCrAl high-entropy alloys[J]. Heat Treatment of Metals, 2025, 50(6): 6-11.

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间隙元素C对亚稳FeMnCoCrAl系高熵合金组织与力学性能的影响

Effect of interstitial element C on microstructure and mechanical properties of metastable FeMnCoCrAl high-entropy alloys

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