Effect of Phase-Structure Evolution on Mechanical Properties of Cr2AlC Coating
Received date: 2022-09-05
Revised date: 2022-10-30
Online published: 2022-11-10
Supported by
National Natural Science Foundation of China(52025014);National Natural Science Foundation of China(52171090);National Natural Science Foundation of China(52101109);Ningbo Natural Science Foundation(2021J220)
With the rapid advancements in high-tech aeroengines and gas turbines, surface protective coatings are of increasing interest for enhancing the mechanical and corrosive performances of blade components under harsh high-temperature conditions. Owing to the unique nanolaminate structure, Cr2AlC coating, a typical Cr-Al-C ceramic comprising MAX phases, provides an excellent combination of metallic and ceramic properties, including high-temperature oxidation resistance and superior damage tolerance. In this work, Cr2AlC coatings were achieved on nickel-based superalloy substrates using a hybrid deposition system with a cathodic arc and magnetron sputtering source and subsequent annealing. Particularly, the effect of microstructure evolution on the mechanical properties of Cr2AlC coating was studied under various thermal annealing temperatures of 1073, 1123, 1173, and 1223 K for 2 h. The phase structure, surface morphology, cross-sectional morphology, and elemental distribution of the coatings were characterized by XRD, SEM, and EDS. The mechanical properties, including the hardness and toughness of the coatings, were tested by nanoindentation and Vickers indentation. The results showed that the Cr2AlC MAX phase was decomposed and transformed into Cr2Al, Cr7C3, and Cr27C6 phases at higher annealing temperatures, and element diffusion of the coatings was also observed. Moreover, it was noted that the transition in the phase structure did not lead to the misfit of the interface, and the coatings maintained both a high hardness of 11 GPa and elastic modulus of 280 GPa, regardless of the annealing process. The slight decrease in toughness for annealed coatings could be attributed in the formation of brittle chromium carbides and Al element diffusion. Such Cr2AlC MAX phase coatings are promising candidates as protective materials for wide applications in harsh high-temperatures applications.
YUAN Jianghuai , WANG Zhenyu , MA Guanshui , ZHOU Guangxue , CHENG Xiaoying , WANG Aiying . Effect of Phase-Structure Evolution on Mechanical Properties of Cr2AlC Coating[J]. Acta Metall Sin, 2023 , 59(7) : 961 -968 . DOI: 10.11900/0412.1961.2022.00438
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