Research on the Oxidation Mechanism of FCC Single-Phase NiCoCrAl0.3Fe High-Entropy Alloy

IF 4.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2026-05-19 DOI:10.1007/s12540-025-02169-2

Peifeng Zhou, Yixin Xiao, Haizhong Zheng, Yongxiang Geng, Jian He, Hongbo Guo

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Abstract

The NiCoCrAl_0.3Fe high-entropy alloy is an excellent high-temperature structural material, exhibiting good phase stability and mechanical properties during service in high-temperature environments. However, there is limited research on the oxidation mechanism of NiCoCrAl_0.3Fe high-entropy alloy in high-temperature environments. In this study, NiCoCrAl_0.3Fe high-entropy alloy with a single-phase FCC structure was prepared using vacuum arc melting technology. The oxidation mechanism of NiCoCrAl_0.3Fe high-entropy alloy at 1100 °C was investigated during the initial stage of oxidation, and the results indicate that the Al element in the high-entropy alloy preferentially undergoes oxidation, followed by the Cr element. The Al element, which oxidizes preferentially, forms granular Al₂O₃ due to its content in the alloy being below the critical concentration (16.13%). Cr ions within the alloy diffuse outward along the interface between Al₂O₃ particles and the high-entropy alloy, forming a continuous Cr₂O₃ layer on the surface of Al₂O₃. During the oxidation process, Al₂O₃ particles transform into elongated Al₂O₃ structures through inward diffusion into the alloy. Subsequently, aggregation and lateral growth occur, leading to the transformation of Al₂O₃ into a continuous layer when the volume fraction of Al₂O₃ within the inner oxidation layer reaches 19.78%. This transformation hinders the outward diffusion of metal ions and the inward diffusion of external oxygen ions, further enhancing the high-temperature oxidation resistance of NiCoCrAl_0.3Fe high-entropy alloy.

Graphical Abstract

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FCC单相NiCoCrAl0.3Fe高熵合金氧化机理研究

NiCoCrAl0.3Fe高熵合金是一种优异的高温结构材料，在高温环境中具有良好的相稳定性和力学性能。然而，对NiCoCrAl0.3Fe高熵合金在高温环境下氧化机理的研究有限。本研究采用真空电弧熔炼技术制备了单相FCC结构NiCoCrAl0.3Fe高熵合金。研究了NiCoCrAl0.3Fe高熵合金在1100℃氧化初期的氧化机理，结果表明：高熵合金中Al元素优先氧化，Cr元素次之；Al元素在合金中含量低于临界浓度（16.13%），优先氧化形成粒状Al2O3。合金内部的Cr离子沿Al2O3颗粒与高熵合金的界面向外扩散，在Al2O3表面形成连续的Cr2O3层。在氧化过程中，Al2O3颗粒通过向合金内扩散转变为细长Al2O3结构。当氧化层内Al2O3的体积分数达到19.78%时，Al2O3发生聚集和横向生长，形成连续的Al2O3层。这种转变阻碍了金属离子向外扩散和外部氧离子向内扩散，进一步增强了NiCoCrAl0.3Fe高熵合金的高温抗氧化性。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.