Hf改性MCrAlY粘结层合金相组成结构与抗高温氧化性能研究

doi:10.11896/cldb.24050041

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Abstract The high-temperature oxidation resistance of bond coating alloys largely depends on phase composition and structure, directly affecting the service performance and life of thermal barrier coatings they prepared. In this work, the phase composition and structure, isothermal oxidation behavior at 1 100 ℃ and Hf distribution characteristics of the Hf-modified MCrAlY bond coating alloy were comprehensively investigated through Thermo-Calc and FactSage thermodynamic calculations, coupled with X-ray diffraction, field emission scanning electron microscopy and electron probe microanalysis, etc. The obtained results showed that the equilibrium phase composition of the bond coating alloy at 400 ℃ was primarily FCC_L12 structured γ′-Ni₃Al and some BCC_B2 structured β-NiAl and α-Cr. The phase transformation of γ′-Ni₃Al+α-Cr→β-NiAl+γ-Ni happened at 857 ℃, and the dominant phase composition changed into β-NiAl and FCC_L12 structured γ-Ni. Under nonequilibrium conditions, the matrix phase at room temperature consisted of β-NiAl and some γ′-Ni₃Al, and the precipitated phase was α-Cr. Moreover, the average mass gain gradually increased from (5.83±0.515) g·m^-2 to (9.42±0.355) g·m^-2, while the oxidation rate continuously decreased from (0.23±0.021) g·m^-2·h^-1 to (0.09±0.004) g·m^-2·h^-1 as the oxidation time increased from 25 h to 100 h. Furthermore, the fitting results indicated that the kinetic characteristics of isothermal oxidation could be accurately described by a parabolic model, and the stable oxidation was divided into two stages. In the first stage ranging from 10 h to 50 h, the oxidation rate constant k_p was equal to 1.797 g²·m^-4·h^-1, and the value obviously decreased to 0.262 g²·m^-4·h^-1 in the second stage of 50—100 h. In addition, the modifying element Hf was primarily distributed at the interface of β-NiAl and γ′-Ni₃Al and brought about the stable formation of HfO₂ within the oxidation layer, which could not only effectively restrain the diffusion of Al and O, but also exert a pinning effect, consequently improving the oxidation resistance of the bond coating alloys and the anti-pee-ling property of the oxidation layer. Notably, the unevenly distributed Hf in the alloy easily resulted in large-sized HfO₂, which caused local internal oxidation.

Key words： bond coating alloy Hf-modified MCrAlY alloy system phase composition and structure high-temperature oxidation resistance

Published: 25 July 2025 Online: 2025-07-29

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TG146.4

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	Articles by authors
	FANG Pinxi
	ZHANG Jing
	XIN Wenbin
	CHANG Zhendong
	SONG Xiwen
	MU Rende

Cite this article:

FANG Pinxi,ZHANG Jing,XIN Wenbin, et al. Phase Composition and Structure and High-temperature Oxidation Resistance of the Hf-modified MCrAlY Bond Coating Alloy[J]. Materials Reports, 2025, 39(14): 24050041-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24050041 OR https://www.mater-rep.com/EN/Y2025/V39/I14/24050041

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