Stress-Induced Formation of μ-TCP Phase During the Early-Stage Interdiffusion Process in the NiCrAlY/NiAlCoCrW Model Coating/Superalloy System at Ambient Temperature

14 Pages Posted: 18 May 2021

See all articles by Qin Li

Qin Li

Central South University - State Key Laboratory of Powder Metallurgy

Shiyao Chen

Central South University - State Key Laboratory of Powder Metallurgy

Yueheng Zhang

Central South University - State Key Laboratory of Powder Metallurgy

Chunming Deng

Guangdong Academy of Science - Key Lab of Guangdong for Modern Surface Engineering Technology

Lijun Zhang

Central South University - State Key Laboratory of Powder Metallurgy

Abstract

In this paper, two model NiCrAlY/NiAlCoCrW coating/superalloy diffusion couples, cp0 and cp15, were prepared and subjected to annealing at 1173 K for 40 h under no stress and a uniaxial compressive stress of 15 MPa, respectively. No microstructural evolution occurred in cp0, while apparent interdiffusion zones and especially a number of TCP phases developed across the interface in cp15. The TCP precipitates, majorly consisting of Ni, Cr, Co and W, were identified as μ phase. Moreover, μ-TCP phase precipitated as small granular particles along the interface perpendicular to the loading axis, while as large needle-like ones on both coating and superalloy sides parallel to the loading direction. The formation of μ-TCP phase with complex morphologies at such early stage of interdiffusion process due to the coupled effect of compressive stress and ambient temperature may seriously reduce the creep lifetime of the coatings/superalloy system.

Keywords: Protective coating; Superalloy; Interface diffusion; Microstructure; TCP phase

Suggested Citation

Li, Qin and Chen, Shiyao and Zhang, Yueheng and Deng, Chunming and Zhang, Lijun, Stress-Induced Formation of μ-TCP Phase During the Early-Stage Interdiffusion Process in the NiCrAlY/NiAlCoCrW Model Coating/Superalloy System at Ambient Temperature. Available at SSRN: https://ssrn.com/abstract=3848996 or http://dx.doi.org/10.2139/ssrn.3848996

Qin Li

Central South University - State Key Laboratory of Powder Metallurgy

Changsha, Hunan 410083
China

Shiyao Chen

Central South University - State Key Laboratory of Powder Metallurgy

Changsha, Hunan 410083
China

Yueheng Zhang

Central South University - State Key Laboratory of Powder Metallurgy

Changsha, Hunan 410083
China

Chunming Deng

Guangdong Academy of Science - Key Lab of Guangdong for Modern Surface Engineering Technology

Guangzhou
China

Lijun Zhang (Contact Author)

Central South University - State Key Laboratory of Powder Metallurgy ( email )

Changsha, Hunan 410083
China

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