Chromium segregation-induced oxide evolution in Ni-10Cr alloys during high-temperature oxidation

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

Corrosion Science Pub Date : 2025-09-18 DOI:10.1016/j.corsci.2025.113332

Shuai Xiao , Ya Cai , Xiao Peng , Jianmin Chen , Yujing Liu , Canying Cai , Xiaochun Liu , Guangwen Zhou

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Abstract

The oxidation behavior of a Ni-10(wt%)Cr alloy under high-temperature O₂ conditions is investigated using transmission electron microscopy and first-principles calculations. Results reveal that chromium segregation plays a central role in driving the evolution of complex oxide phase structures during oxidation. At low Cr concentrations, Cr preferentially segregates to NiO grain boundaries or internal pores, substituting for Ni atoms and forming Ni(Cr)O solid solutions. As Cr content increases, enhanced diffusion promotes Cr penetration into the NiO lattice, leading to the formation of multiphase oxide structures. First-principles modeling corroborates these findings: at low Cr concentrations, Cr atoms favor surface and grain-boundary segregation, while higher concentrations lead to Cr aggregation within the NiO bulk. The integrated experimental-theoretical approach provides atomistic insights into Cr-mediated mass transport mechanisms during alloy oxidation and offers valuable guidance for controlling oxide growth kinetics and phase stability in Ni-Cr alloys, with implications for improving oxidation resistance in high-temperature structural applications.

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Ni-10Cr合金高温氧化过程中铬偏析诱导的氧化物演化

采用透射电镜和第一性原理计算研究了Ni-10(wt%)Cr合金在高温O2条件下的氧化行为。结果表明，在氧化过程中，铬偏析对复杂氧化相结构的演化起着核心作用。在低Cr浓度下，Cr优先向NiO晶界或内部孔隙偏析，取代Ni原子形成Ni(Cr)O固溶体。随着Cr含量的增加，扩散增强促进Cr渗入NiO晶格，形成多相氧化物结构。第一性原理模型证实了这些发现：在低Cr浓度下，Cr原子有利于表面和晶界偏析，而高浓度会导致Cr在NiO体内聚集。该综合实验-理论方法提供了合金氧化过程中cr介导的质量传递机制的原子性见解，并为控制Ni-Cr合金的氧化物生长动力学和相稳定性提供了有价值的指导，对提高高温结构应用中的抗氧化性具有重要意义。

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.