Matrix-induced Cr2CTx MXene superlattice transforming coherent M23(C1-xOx)6 solid solution reinforced high-entropy alloy composite

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-09-09 DOI:10.1016/j.matchar.2025.115554

Xue Li , Zhenying Huang , Hongjie Wang , Zhexuan Zhang , Wenqiang Hu , Qun Yu , Weici Zhuang , Youbo Wu , Yang Zhou , Ziqiang Zhu

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引用次数: 0

Abstract

High-entropy alloys (HEAs) exhibit robust strength and excellent ductility, rendering them well-suited for service as metal matrices. Adding 2D materials like MXene as reinforcements can further improve their properties. In this study, a specific HEA (AlCoCrFeNi₂) was combined with Cr₂CT_x MXene in different amounts. When 0.5 wt% of MXene was added, the composite had a yield strength of 822 MPa and 9 % elongation. At a concentration of 1 wt%, MXene forms spherical particles within the composite, resulting in a yield strength of 1088 MPa and an elongation of 7 %. Additionally, the composite exhibits a 50 % increase in high-temperature strength at 1023 K compared to the base HEA. These spherical particles have a structure of oxygen-interstitial M₂₃(C_1-xO_x)₆ solid solution. The study suggests that the MXene transforms into these spherical particles through an intermediate superlattice phase, which was confirmed by advanced microscopy and DFT calculations. This new composite material shows improved high-temperature strength, making it potentially useful for applications where heat and corrosion resistance are important.

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基体诱导的Cr2CTx MXene超晶格相变相干M23(C1-xOx)6固溶体增强高熵合金复合材料

高熵合金（HEAs）具有强大的强度和良好的延展性，使其非常适合作为金属基体使用。添加MXene等2D材料作为增强材料可以进一步改善其性能。在本研究中，一种特异性HEA （AlCoCrFeNi2）以不同的量与Cr2CTx MXene结合。当MXene添加量为0.5 wt%时，复合材料的屈服强度为822 MPa，伸长率为9%。当MXene的浓度为1wt %时，复合材料内部形成球形颗粒，屈服强度为1088 MPa，伸长率为7%。此外，复合材料在1023 K时的高温强度比基体HEA提高了50%。这些球形颗粒具有氧间隙型M23(C1-xOx)6固溶体结构。该研究表明，MXene通过中间超晶格相转变成这些球形颗粒，这被先进的显微镜和DFT计算证实。这种新型复合材料显示出更高的高温强度，使其在耐热性和耐腐蚀性很重要的应用中具有潜在的用途。

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

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.