通过添加W元素提升铸态共晶高熵合金的力学性能

杨旭; 陈德志; 冯丽; 秦刚; 吴士平; 陈瑞润

doi:10.1007/s12613-024-2892-x

Volume 31 Issue 6

Jun. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(6): 1364-1372

Xu Yang, Dezhi Chen, Li Feng, Gang Qin, Shiping Wu, and Ruirun Chen, Enhancing the mechanical properties of casting eutectic high-entropy alloys via W addition, Int. J. Miner. Metall. Mater., 31(2024), No. 6, pp. 1364-1372. https://doi.org/10.1007/s12613-024-2892-x

Cite this article as:

Xu Yang, Dezhi Chen, Li Feng, Gang Qin, Shiping Wu, and Ruirun Chen, Enhancing the mechanical properties of casting eutectic high-entropy alloys via W addition, Int. J. Miner. Metall. Mater., 31(2024), No. 6, pp. 1364-1372. https://doi.org/10.1007/s12613-024-2892-x

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研究论文

通过添加W元素提升铸态共晶高熵合金的力学性能

哈尔滨工业大学材料科学与工程学院金属精密热加工国家重点实验室，哈尔滨 150001，中国

通讯作者:
陈德志 E-mail: chendezhi383@163.com

陈瑞润 E-mail: ruirunchen@hit.edu.cn

文章亮点

(1) 设计并制备了Al_1.25CoCrFeNi_3-xW_x高熵合金，通过调节W的含量，实现了强度和塑性的平衡

(2) 探究了W元素对于微观组织转变的影响

(3) 分析了微观组织转变与力学性能之间的关系，计算了强化机制

(4) 通过理论分析和实验总结了合金的变形和断裂机制

中文摘要

共晶高熵合金由于其优异的物理和化学性能，近年了引发了人们的广泛关注。然而共晶高熵合金在力学强度方面仍有较大的提升空间。为了进一步提升共晶高熵合金的性能，本实验设计并制备了Al_1.25CoCrFeNi_3−xW_x高熵合金，并深入探究W元素对共晶高熵合金组织演变和力学性能的影响。研究结果表明，Al_1.25CoCrFeNi_3−xW_x高熵合金由面心立方相和体心立方(BCC)相组成。随着W含量的增加，微观结构由共晶结构转变为树枝晶结构。W的加入降低了BCC相的形核障碍，减小了合金体系的价电子浓度，并替换了BCC相中的Al元素，从而促进了BCC相的形核。拉伸测试结果表明W的加入明显提升了合金的拉伸性能，固溶强化、异质界面强化和第二相强化是主要的强化机制。Al_1.25CoCrFeNi_2.95W_0.05高熵合金实现了强度和塑性的匹配，屈服强度、抗拉强度和延伸率分别为601.44 MPa, 1132.26 MPa和15.94%。Al_1.25CoCrFeNi_3−xW_x高熵合金的断裂方式为韧-脆混合型断裂，裂纹在BCC相内萌生和扩展。共晶组织的片层结构延缓了裂纹的扩展，进而提升了合金的塑性。

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Research Article

Enhancing the mechanical properties of casting eutectic high-entropy alloys via W addition

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Abstract

Abstract

The effect of W element on the microstructure evolution and mechanical properties of Al_1.25CoCrFeNi₃ eutectic high-entropy alloy and Al_1.25CoCrFeNi_3−xW_x (x = 0, 0.05, 0.1, 0.3, and 0.5; atomic ratio) high-entropy alloys (HEAs) were explored. Results show that the Al_1.25CoCrFeNi_3−xW_x HEAs are composed of face-centered cubic and body-centered cubic (BCC) phases. As W content increases, the microstructure changes from eutectic to dendritic. The addition of W lowers the nucleation barrier of the BCC phase, decreases the valence electron concentration of the HEAs, and replaces Al in the BCC phase, thus facilitating the nucleation of the BCC phase. Tensile results show that the addition of W greatly improves the mechanical properties, and solid-solution, heterogeneous-interface, and second-phase strengthening are the main strengthening mechanisms. The yield strength, tensile strength, and elongation of the Al_1.25CoCrFeNi_2.95W_0.05 HEA are 601.44 MPa, 1132.26 MPa, and 15.94%, respectively, realizing a balance between strength and plasticity. The fracture mode of the Al_1.25CoCrFeNi_3−xW_x HEAs is ductile–brittle mixed fracture, and the crack propagates and initiates in the BCC phase. The eutectic lamellar structure impedes crack propagation and maintains plasticity.
- high-entropy alloy;
- microstructure;
- mechanical property;
- fracture behavior

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