Failure mechanism and interfacial diffusion behavior of Ru-doped NiAlHf coatings at 1200 °C

Hongzhi Yang; Xiaoya Li; Jianpeng Zou; Qian Shi; Mingjiang Dai; Changguang Deng; Pengbo Lyu

Advanced Powder Materials (Jan 2023)

Failure mechanism and interfacial diffusion behavior of Ru-doped NiAlHf coatings at 1200 °C

Hongzhi Yang,
Xiaoya Li,
Jianpeng Zou,
Qian Shi,
Mingjiang Dai,
Changguang Deng,
Pengbo Lyu

Affiliations

Hongzhi Yang: State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China; Institute of New Materials, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Academy of Sciences, Guangzhou, 510651, China; Key Laboratory of Materials Design and Preparation Technology of Hunan Province, School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China
Xiaoya Li: State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China; Institute of New Materials, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Academy of Sciences, Guangzhou, 510651, China
Jianpeng Zou: State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China; Corresponding author.
Qian Shi: Institute of New Materials, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Academy of Sciences, Guangzhou, 510651, China; Corresponding author.
Mingjiang Dai: Institute of New Materials, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Academy of Sciences, Guangzhou, 510651, China
Changguang Deng: Institute of New Materials, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Academy of Sciences, Guangzhou, 510651, China
Pengbo Lyu: Institut Charles Gerhardt Montpellier, UMR 5253, CNRS, Université de Montpellier, Montpellier, France

Journal volume & issue: Vol. 2, no. 1
p. 100059

Abstract

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Ru-doped NiAlHf coatings were deposited on Ni-based single crystal substrate by arc ion plating technology. The failure mechanism and interfacial diffusion behavior were comparatively investigated with NiAlHf coating using scanning electron microscopy, electron probe micro-analyzer, and transmission electron microscopy. The results indicated that microstructure evolution of oxide scale induced by element diffusion process significantly affected oxidation resistance of NiAlHf/Ru coatings, resulting in formation of cracks and voids, thereby accelerating failure process. The precipitates in interdiffusion zone and secondary reaction zone of the substrate initiated by interfacial element diffusion were P phase and σ phase, respectively. And the discrepancy in content was elucidated from the perspective of thermodynamics and kinetics. Besides, microstructural evolution between NiAlHf/Ru coatings and substrate was also deliberated. The research could not only provide profound understanding of NiAlHf/Ru coatings failure mechanism, but also had significant guidance for suppressing precipitation of topological close-packed phases and facilitating development of single crystal Ni-based superalloys.

Published in Advanced Powder Materials

ISSN: 2772-834X (Online)
Publisher: KeAi Communications Co. Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/advanced-powder-materials/

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