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| 铜含量对CoCrFeNi高熵合金组织结构和性能的影响 |
| Effects of Copper Addition on Microstructure and Properties of CoCrFeNi High Entropy Alloy |
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| DOI：10.3969/j.issn.1674-6457.2022.12.001 |
| 中文关键词: 高熵合金 微观组织 力学性能 导电性能 热膨胀系数 |
| 英文关键词: high entropy alloy microstructure mechanical properties electrical conductivity coefficient of thermal expansion |
| 基金项目:国家自然科学基金(52273280) |
| Author Name | Affiliation | | LI Chang-wei | Beijing Advanced Innovation Center for Materials and Genetic Engineering/State Key Laboratory of Advanced Metal Materials,Beijing Key Laboratory of Magneto-Optoelectronic Composites and Interface Science, University of Science and Technology Beijing, Beijing 100083, China | | ZHANG Yong | Beijing Advanced Innovation Center for Materials and Genetic Engineering/State Key Laboratory of Advanced Metal Materials,Beijing Key Laboratory of Magneto-Optoelectronic Composites and Interface Science, University of Science and Technology Beijing, Beijing 100083, China
Shunde Graduate School, University of Science and Technology Beijing, Foshan 528399, China |
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| 中文摘要: |
| 通过设计不同Cu含量的CoCrFeNi高熵合金，筛选出一种具有较高强度和导电性的Cu基高熵合金。采用X射线衍射仪、光学显微镜、扫描电子显微镜、力学性能测试机、电阻测试仪研究了铸态CoCrFeNiCux(x=1，2，3，4，5)高熵合金的组织、力学和导电性能。当x=1，2时，合金为FCC单相;当x≥3时，合金除了FCC相外还存在其他析出相。当x=1时，合金的微观形貌由等轴晶组成;当x≥1时，合金的微观形貌是树枝晶和等轴晶形貌，枝晶间的Cu含量较高。合金的拉伸强度和伸长率均随着Cu含量的升高先降低后升高，其中CoCrFeNiCu3合金的综合力学性能最差，抗拉强度仅约120 MPa，伸长率不到1%。CoCrFeNiCu5合金具有最优异的综合力学性能，其抗拉强度约为370 MPa，伸长率约为11%。合金的电阻率随着Cu含量的升高逐渐降低，CoCrFeNiCu5合金的电阻率最低，导电性能最好，同时，电阻随着温度的升高而升高。测试了5种合金的热膨胀系数，其随着Cu含量的升高呈波浪性上升。结合拉伸测试和导电性能测试结果，CoCrFeNiCu5合金具有优异的综合力学性能和导电性能。 |
| 英文摘要: |
| The work aims to select Cu-based high entropy alloys of high strength and electrical conductivity by designing CoCrFeNi high entropy alloy of different Cu contents. The microstructure, mechanical and electrical properties of as-cast CoCrFeNiCux (molar ratio, x=1, 2, 3, 4, 5) high entropy alloy were investigated by X-ray diffractometer, optical microscope, scanning electron microscope, mechanical property tester and resistance tester. The results showed that when x=1 and 2, the alloy was face-centered cubic (FCC) single-phase. When x≥3, the alloy was composed of FCC phase and other unknown precipitated phases. When x=1, the microstructure of the alloy was composed of equiaxed crystals. When x≥1, the microstructure of the alloy was composed of dendritic and equiaxed dendrite morphology, and the content of Cu was rich in the dendrite. With the increase of Cu content, the tensile strength and elongation of the alloy first decreased and then increased. Among them, CoCrFeNiCu3 alloy had the worst comprehensive mechanical properties, the tensile strength was about 120 MPa and the elongation was less than 1%. The alloy of CoCrFeNiCu5 had the best comprehensive mechanical properties, and the tensile strength was about 370 MPa and the elongation was about 11%; The resistivity of the alloy decreased gradually with the increase of Cu content, thus CoCrFeNiCu5 alloy had the lowest resistivity, that was, the best conductivity. While the resistivity increased with the increase of temperature. In summary, the CoCrFeNiCu5 alloy had excellent comprehensive mechanical properties and good electrical conductivity. Meanwhile, the thermal expansion coefficients of the five alloys were tested, and the results showed that the thermal expansion coefficients of the alloys increased zigzag with the increase of Cu content. In combination with the results of tensile test and electrical conductivity test, it can be concluded that CoCrFeNiCu5 alloy has excellent comprehensive mechanical properties and electrical conductivity. |
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