Co 分布对富钼镍基单晶超级合金中铝化物涂层氧化行为的影响

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2024-10-18 DOI:10.1016/j.intermet.2024.108531

X.Y. Chen , Y. Liu , H. Zhang , S.K. Gong , Y.L. Pei , S.S. Li

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引用次数: 0

摘要

通过无电解电镀和气相镀铝（VPA）技术，在富钼镍基单晶超级合金上制备了三种不同钴含量分布的钴改性涂层。随后在 1000 °C 下对这些涂层进行了长达 500 小时的静态氧化试验，以揭示其氧化行为。研究结果表明，在涂层中加入 Co 会阻碍铝和钼在渗透层中的扩散，从而导致涂层在 1000 °C 氧化过程中的抗氧化性略有下降。此外，在氧化初期，Co 还加速了 θ 到 α Al2O3 的相变。为了阐明氧化动力学以及与不同 Co 浓度下铝涂层扩散行为相关的基本机制，我们进行了一项综合分析。

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Effect of Co distribution on the oxidation behavior of aluminide coatings in Mo-rich Ni-based single-crystal superalloy

Three Co-modified coatings with different Co content distribution were prepared by electroless plating and vapor phase aluminizing (VPA) technique on Mo-rich Ni-based single-crystal superalloy. These coatings were subsequently subjected to prolonged static oxidation tests at 1000 °C for a duration of 500 h to reveal their oxidation behavior. The findings of this study indicated that the incorporation of Co within the coatings impeded the diffusion of Al and Mo within the infiltration layer and results in a slight decrease in the oxidation resistance of the coatings during the oxidation at 1000 °C. Additionally, Co accelerated the θ-to-α Al₂O₃ phase transformation at the initial oxidation stage. A comprehensive analysis was conducted to elucidate the oxidation kinetics and the underlying mechanisms associated with the diffusion behavior of the aluminide coatings in the presence of varying Co concentrations.

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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.