Influence of Al content on the microstructure and performance of AlxCoCrFeNi2.1 high-entropy alloys via laser-directed energy deposition

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-06-14 DOI:10.1016/j.jallcom.2025.181630

Wei Yang , Xiao Xiao , Daxin Zeng , Jianyong Liu , Fengguang Li , Wumeng Liu , Keke Zhang

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引用次数: 0

Abstract

High-entropy alloys Al_xCoCrFeNi_2.1 (x: atomic ratio, x = 1.0–1.5) were synthesized using laser-directed energy deposition. The results revealed that crack sensitivity increases with higher Al concentration, with crack-free samples achievable when x ≤ 1.3. The alloys exhibited a dual-phase structure consisting of face-centered cubic (FCC) and body-centered cubic (BCC) or B2 phases. Increasing the Al content increased the BCC/B2 phase volume and promoted the precipitation of spherical Cr-rich BCC phase nanoparticles. These ordered nanoparticles resulted in the highest tensile strength for the Al1.1 alloy, with a yield strength of 1038.6 MPa, an ultimate tensile strength of 1448.1 MPa, and a fracture elongation of 7.3 %. Theoretical calculations indicated that solid-solution strengthening and precipitation strengthening are the primary contributing mechanisms. Further increasing the Al content decreased ductility but significantly enhanced the alloys' hardness and high-temperature wear resistance, attributed to the synergistic effects of increased hard phase content, altered phase orientation relationships, and disordered nanoprecipitates formation.

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Al含量对激光定向能沉积AlxCoCrFeNi2.1高熵合金组织和性能的影响

采用激光定向能沉积法合成了高熵合金AlxCoCrFeNi2.1 （x：原子比，x=1.3 ~ 1.5）。结果表明，随着Al浓度的增加，裂纹敏感性增加，当x≤1.3时，试样可以实现无裂纹。合金表现为面心立方（FCC）和体心立方（BCC）或B2相的双相结构。Al含量的增加增加了BCC/B2相体积，促进了球形富cr BCC相纳米颗粒的析出。这些有序的纳米颗粒使Al1.1合金的抗拉强度最高，屈服强度为1038.6 MPa，极限抗拉强度为1448.1 MPa，断裂伸长率为7.3%。理论计算表明，固溶强化和沉淀强化是主要的作用机制。进一步增加Al含量降低了合金的延展性，但显著提高了合金的硬度和高温耐磨性，这是由于硬相含量的增加、相取向关系的改变和纳米沉淀的无序形成的协同作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.