Effect of pretreatment on the microstructure evolution and high-temperature oxidation of oxide dispersion-strengthened AlCoCrFeNi2.1 coatings formed by high-speed laser cladding

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

Corrosion Science Pub Date : 2025-08-11 DOI:10.1016/j.corsci.2025.113258

Peng Wang , Xianglin Zhou , Zhipei Chen , Longjun He , Shunping Liu , Qipeng Hu , Xinggang Li , Pengfei Zhang , Ziyang Wang , Xueyuan Ge

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引用次数: 0

Abstract

Oxide dispersion-strengthened (ODS) AlCoCrFeNi_2.1 eutectic high-entropy alloy (EHEA) composite coatings were pre-treated using different solution treatment times (STT) and precipitation treatment times (PTT) at 1020 ℃ and 880 ℃, respectively. Their microstructure evolution, oxidation properties, and thermally grown oxide (TGO) failure during oxidation at 1100 ℃ were characterized. The results showed that large coefficient of thermal expansion (CTE) differences, weak nano-B2 phase pinning, and longer grain boundary migration times resulted in abnormal grain growth at the bottom of the coating pre-treated at STT = 1.0 h. This slowed the diffusion and enrichment rates of Y₂Hf₂O₇ nanoparticles toward grain boundaries in the coating, whereas the coating/TGO interface remained planar. The oxidation rate constants and TGO spallation rate decreased as the STT or PTT increased because there were fewer coated grain boundaries and enriched Y₂Hf₂O₇ nanoparticles. The oxidation rate and the TGO/coating interface planarity of the pre-treated coating at STT = 1.0 h were better than those of un-pretreated coatings and NiCoCrAlY coatings. This report provides a pre-treatment method to improve the oxidation resistance of ODS AlCoCrFeNi_2.1 composite coatings.

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预处理对高速激光熔覆氧化分散增强AlCoCrFeNi2.1涂层组织演变及高温氧化的影响

采用不同的固溶处理次数（STT）和沉淀处理次数（PTT）分别在1020℃和880℃对ODS共晶高熵合金（EHEA）复合涂层进行预处理。研究了它们在1100℃氧化过程中的微观结构演变、氧化性能和热生长氧化物（TGO）失效。结果表明：在STT = 1.0 h时，较大的热膨胀系数（CTE）差异、较弱的纳米b2相钉钉和较长的晶界迁移次数导致涂层底部出现异常晶粒生长；这减缓了Y2Hf2O7纳米颗粒在涂层中向晶界的扩散和富集速率，而涂层/TGO界面保持平面。随着STT和PTT的增加，氧化速率常数和TGO剥落率降低，这是由于涂层晶界减少和Y2Hf2O7纳米颗粒富集所致。STT = 1.0 h时，预处理涂层的氧化速率和TGO/涂层界面平面度均优于未预处理涂层和NiCoCrAlY涂层。本文提出了一种提高ODS AlCoCrFeNi2.1复合涂层抗氧化性能的预处理方法。

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.