Phase-specific corrosion responses of FeCrNiAl dual-phase HEA to oxygen variations in lead-bismuth eutectic

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-09-22 DOI:10.1016/j.corsci.2025.113354

Yuxin Lou , Zhao Shen , Ziye Dong , Kun Zhang , Jiaqi Li , Yiheng Wu , Zhenfei Jiang , Hao Wang , Yang Ding , Xintao Zhang , You Wang , Kai Chen , Xiaoqin Zeng

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Abstract

This study elucidates the phase-specific corrosion mechanisms of a FeCrNiAl dual-phase high-entropy alloy (DP-HEA) in lead-bismuth eutectic (LBE) at 500 °C under two representative oxygen concentrations (10⁻⁴ wt% and 10⁻⁷ wt%). Through systematic multi-scale characterization, we reveal a sharp mechanistic transition from oxidation to selective dissolution governed by the dissolved oxygen content. In oxygen-saturated LBE, the Al-rich BCC matrix phase preferentially oxidizes to form a porous FeAl₂O₄ spinel network, while the FCC matrix phase exhibits superior oxidation resistance owing to the formation of Cr-rich oxides. Conversely, in oxygen-deficient LBE, the FCC phase undergoes rapid Ni depletion, structural destabilization, and phase transformation into BCC, whereas the BCC phase—stabilized by B2-NiAl and Fe–Cr intermetallics—remains largely intact. These findings demonstrate the opposing roles of FCC and BCC matrix phases in resisting oxidation and dissolution, respectively, and highlight the importance of oxygen activity in dictating corrosion pathways. A unified mechanistic framework is proposed to describe the corrosion evolution under varying oxygen conditions, providing critical insights for the design of LBE-compatible structural materials for lead-cooled fast reactors.

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fe2o3双相HEA对铅铋共晶中氧变化的相特异性腐蚀响应

本研究阐明了一种FeCrNiAl双相高熵合金（DP-HEA）在500°C铅铋共晶（LBE）中在两种代表性氧浓度（10⁻⁴wt%和10⁻⁷wt%）下的相特异性腐蚀机制。通过系统的多尺度表征，我们揭示了由溶解氧含量控制的从氧化到选择性溶解的急剧机制转变。在氧饱和LBE中，富al的BCC基体相优先氧化形成多孔FeAl₂O₄尖晶石网络，而FCC基体相由于形成富cr氧化物而表现出优异的抗氧化性。相反，在缺氧LBE中，FCC相经历了快速的Ni耗尽、结构不稳定和向BCC的相变，而BCC相由B2-NiAl和Fe-Cr金属间化合物稳定，基本保持完整。这些发现证明了FCC和BCC基质相在抗氧化和抗溶解方面的相反作用，并强调了氧活性在决定腐蚀途径中的重要性。提出了一个统一的机制框架来描述不同氧条件下的腐蚀演变，为设计lbe兼容的铅冷快堆结构材料提供了重要的见解。

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

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.