Enhanced oxidation resistance of CoNiCrAlY-MoSi2 alloy by oscillating laser-directed energy deposition: Role of (Cr,Mo)3(Co,Ni)5Si2 phase-mediated element-trapping

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

Corrosion Science Pub Date : 2025-09-25 DOI:10.1016/j.corsci.2025.113334

Yunzhen Xu , Pan Ren , Lei Qin , Cheng Deng , Delong Zeng , Shengfeng Zhou

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引用次数: 0

Abstract

To improve the oxidation resistance of CoNiCrAlY alloy, 10 wt% MoSi₂ was introduced into the material using oscillating-laser directed energy deposition (OL-DED). A comparative study of the microstructural evolution and isothermal oxidation behavior between the CoNiCrAlY and CoNiCrAlY-10MoSi₂ alloys was conducted. The results show that adding MoSi₂ with a low coefficient of thermal expansion (CTE) promotes the formation of intermetallic compounds (β and (Cr,Mo)₃(Co,Ni)₅Si₂ phase), reduces the CTE mismatch between oxide scale and CoNiCrAlY-10MoSi₂ alloy, mitigates the risks of oxide scale cracking/spalling, and increases the service temperature of CoNiCrAlY-10MoSi₂ alloy by over 100 °C (to 1100 °C). Furthermore, the (Cr,Mo)₃(Co,Ni)₅Si₂ phase in CoNiCrAlY-10MoSi₂ alloy immobilizes Cr/Mo via high-temperature element-trapping effect, suppressing volatile MoO₃ formation and inhibiting detrimental spinel oxides (e.g., Co(Ni)Cr₂O₄), maintain the oxide scale integrity. This mechanism maintains protective scale integrity and synergistically enhances oxidation resistance.

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振荡激光定向能沉积增强CoNiCrAlY-MoSi2合金的抗氧化性能：（Cr,Mo）3(Co,Ni)5Si2相介导元素捕获的作用

为了提高CoNiCrAlY合金的抗氧化性能，采用振荡激光定向能沉积法（OL-DED）将10 wt%的MoSi2引入到材料中。对CoNiCrAlY和CoNiCrAlY- 10mosi2合金的组织演变和等温氧化行为进行了比较研究。结果表明：加入低热膨胀系数（CTE）的MoSi2促进了金属间化合物（β和（Cr,Mo）3(Co,Ni)5Si2相）的形成，降低了氧化皮与CoNiCrAlY-10MoSi2合金的CTE失配，降低了氧化皮开裂/剥落的风险，使CoNiCrAlY-10MoSi2合金的使用温度提高了100℃以上（至1100℃）。此外，CoNiCrAlY-10MoSi2合金中的（Cr,Mo）3(Co,Ni)5Si2相通过高温元素捕获效应固定Cr/Mo，抑制挥发性MoO3的形成，抑制有害尖晶石氧化物（如Co(Ni)Cr2O4），保持氧化物的完整性。该机制保持了保护垢的完整性，并协同增强了抗氧化性。

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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.