Achieving high yield strength in a directly cast eutectic high entropy alloy via introducing κ′ nano-precipitates

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-06-29 DOI:10.1016/j.jallcom.2025.181935

Xiaoyu Liang, Jian Chen, Rengen Ding, Yuhong Yao, Weili Wang, Tao Zhang, Jiahua He, Yunzi Liu, Jiangnan Liu

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引用次数: 0

Abstract

Eutectic high entropy alloy (EHEA) with excellent mechanical properties has attained significant attention in science and engineering fields. However, achieving high tensile yield strength is encountering serious challenges via conventional casting. Here, we report a novel approach to overcome this difficulty via introducing κ′ phase into FCC phase in EHEA. As a proof, (Al19Co20Fe20Ni41)100-xCx (x = 0.5, 1 and 2, denoted as Cx alloys hereafter) EHEAs were produced by conventional vacuum arc-melting. Their eutectic structures and mechanical properties were investigated in detail. Experimental results confirm that C element plays a key role in forming κ′ phase and that the κ′ phase provides an excellent strengthening effect. Among three κ′-strengthened EHEAs, the C1 alloy exhibits a relatively optimal combination of yield strength and ductility, with a yield strength close to 1GPa and a good fracture elongation of approximately 7%. The yield strength was increased by nearly 50% as compared with the base alloy, which is mainly attributed to the ordering strengthening of κ′ phase. Our results would provide an innovative and viable route to improve the tensile properties of directly cast eutectic high-entropy alloy and expend the application of eutectic high-entropy alloy.

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通过引入κ′纳米析出物，实现了直铸共晶高熵合金的高屈服强度

共晶高熵合金（EHEA）具有优异的力学性能，在科学和工程领域受到了广泛的关注。然而，通过传统铸造技术实现高抗拉屈服强度面临严峻挑战。在这里，我们报道了一种通过在EHEA的FCC相中引入κ '相来克服这一困难的新方法。作为证明，采用常规真空电弧熔炼法制备了（Al19Co20Fe20Ni41）100-xCx （x = 0.5, 1和2，以下记为Cx合金）EHEAs。详细研究了它们的共晶结构和力学性能。实验结果证实，C元件在κ ‘相的形成中起关键作用，κ ’相具有良好的强化作用。在3种κ′强化EHEAs中，C1合金的屈服强度和塑性组合相对较优，屈服强度接近1GPa，断裂伸长率约为7%。与基体相比，屈服强度提高了近50%，这主要是由于κ′相的有序强化。研究结果为提高直铸共晶高熵合金的拉伸性能，拓展共晶高熵合金的应用领域提供了一条创新可行的途径。

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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.