Unexpected carbide formation in the FeCoNiCr high-entropy alloy under prolonged high temperature ion irradiation

IF 5.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2026-04-01 Epub Date: 2026-02-02 DOI:10.1016/j.intermet.2026.109193

Da Chen , Yingming Sang , Zhaoyi Cheng , Jianrong Sun , Shaofei Liu , Guma Yeli , Ji-Jung Kai

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引用次数: 0

Abstract

In this study, the solid solution FeCoNiCr high-entropy alloy (HEA) was heavily irradiated by 3 MeV Ni ions to ∼ 107 dpa at 873 K. Transmission electron microscopy characterizations revealed that the multicomponent carbides of M₂₃C₆ (M = Cr, Fe, Co, Ni) formed at a specific depth range adjacent to the peak radiation damage layer. The grain boundaries were more sensitive to precipitation where the carbides showed a larger size, denser distribution and higher Cr-concentration. For the underlying mechanisms, carbon contaminations from irradiation chamber were believed to introduce C which diffused into the alloy during high-temperature irradiation. Meanwhile, the radiation induced supersaturation of Cr-interstitials supplied the necessary solutes for precipitation. The kinetic stability of carbides was controlled by radiation cascade damage against the thermodynamic driving force for phase formation. It explains why precipitates appeared at a defined depth.

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FeCoNiCr高熵合金在长时间高温离子辐照下意外形成碳化物

在本研究中，采用3mev Ni离子在873 K下重照射FeCoNiCr高熵合金（HEA）至~ 107 dpa。透射电镜表征表明，M23C6的多组分碳化物（M = Cr, Fe, Co, Ni）在峰值辐射损伤层附近的特定深度范围内形成。晶界对析出更敏感，碳化物尺寸更大，分布更密，cr浓度更高。在高温辐照过程中，辐照室的碳污染将C引入合金，并扩散到合金中。同时，辐射诱导的cr间隙过饱和为沉淀提供了必要的溶质。碳化物的动力学稳定性是由相形成的热力学驱动力的辐射级联损伤控制的。它解释了为什么沉淀出现在一定的深度。

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

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.