The role of copper in transforming CuxCoCrNiAl high-entropy alloys for enhanced strength and ductility

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2025-05-01 Epub Date: 2025-03-25 DOI:10.1016/j.matchar.2025.114973

Fa-Chang Zhao , Guo-Ning Ji , Xing-Ming Zhao, Rong-Da Zhao, Fu-Fa Wu

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Abstract

This study conducted a detailed analysis of the microstructure evolution and mechanical properties of a series of Cu_xCoCrNiAl high-entropy alloys (HEAs) to assess the influence of Cu content on HEAs. The findings indicated that with increasing Cu content, the alloy's phase structure changed from FCC1 + FCC2 (AlCu) + BCC to FCC phase. As the Cu content rose from 20 % to 80 %, the hardness of the alloy decreased progressively from 515 HV to 135 HV, and the ultimate tensile strength reduced from 1335 MPa to 524 MPa. The fracture mechanism shifted from a mixed brittle-ductile fracture to a ductile fracture. Consequently, the Cu₄CoCrNiAl HEA (CA50) demonstrated superior overall mechanical properties, with hardness, yield strength, ultimate tensile strength, and elongation measured at 321 HV, 556 MPa, 846 MPa, and 16.4 %, respectively. This research is significant for the advancement of engineering and structural materials with outstanding mechanical properties.

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铜在CuxCoCrNiAl高熵合金中增强强度和延展性的作用

本研究详细分析了一系列CuxCoCrNiAl高熵合金（HEAs）的组织演变和力学性能，以评估Cu含量对HEAs的影响。结果表明：随着Cu含量的增加，合金的相结构由FCC1 + FCC2 (AlCu) + BCC转变为FCC相；随着Cu含量从20%增加到80%，合金硬度从515 HV逐渐降低到135 HV，极限抗拉强度从1335 MPa降低到524 MPa。断裂机制由脆性-韧性混合断裂转变为韧性断裂。因此，Cu4CoCrNiAl HEA （CA50）表现出优异的综合力学性能，其硬度、屈服强度、极限抗拉强度和延伸率分别为321 HV、556 MPa、846 MPa和16.4%。该研究对开发具有优异力学性能的工程材料和结构材料具有重要意义。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.