Exceptional mechanical properties of(Ti_(1−x)Zr_(x))_(2)AlC MAX phase coatings with amorphous-nanocrystalline oxidation layersOA
The brittleness of hard ceramic materials poses a significant challenge to their practical application because of the trade-off between hardness and toughness.Here,we propose a hierarchical structure strategy that utilizes alloying and vacuum oxidation to fabricate MAX phase coatings with an amorphous-nanocrystalline oxidation layer on the surface.Hierarchical(Ti_(1−x)Zr_(x))_(2)AlC coatings(x=0.05–0.18)were prepared via magnetron sputtering followed by vacuum annealing,and the hardness and fracture toughness increased simultaneously with increasing Zr content.A maximum hardness of 19.4 GPa and fracture toughness of 4.1 MPa·m^(1/2)were achieved in the(Ti_(0.82)Zr_(0.18))_(2)AlC coating,significantly surpassing previously reported MAX phase coatings.The enhanced hardness primarily originated from the formation of solid solutions of Zr at the M-site and second phase Zr_(3)Al_(2),whereas the exceptional toughness was attributed to the amorphous-nanocrystalline structure in the surface oxidation layer and the gradient structure of the coatings.These findings provide a pioneering approach based on alloying and oxidation for developing hard yet tough MAX phase coatings and other ceramic materials.
Kaihang Wang;Yan Zhang;Guanshui Ma;Yuxi Xu;Zhenyu Wang;Aiying Wang
State Key Laboratory of Advanced Marine Materials,Zhejiang Key Laboratory of Extreme-environmental Material Surfaces and Interfaces,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,ChinaState Key Laboratory of Advanced Marine Materials,Zhejiang Key Laboratory of Extreme-environmental Material Surfaces and Interfaces,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,ChinaState Key Laboratory of Advanced Marine Materials,Zhejiang Key Laboratory of Extreme-environmental Material Surfaces and Interfaces,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,ChinaState Key Laboratory of Advanced Marine Materials,Zhejiang Key Laboratory of Extreme-environmental Material Surfaces and Interfaces,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,ChinaState Key Laboratory of Advanced Marine Materials,Zhejiang Key Laboratory of Extreme-environmental Material Surfaces and Interfaces,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,ChinaState Key Laboratory of Advanced Marine Materials,Zhejiang Key Laboratory of Extreme-environmental Material Surfaces and Interfaces,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China
化学化工
MAX phase coatinghardness-toughnesssolid solutionamorphous-nanocrystallinegradient structure
《Journal of Advanced Ceramics》 2026 (1)
P.77-88,12
supported by the National Key R&D Program of China(No.2024YFB3816500)the National Natural Science Foundation of China(Nos.U22A20111 and 52571117)the Natural Science Foundation of Zhejiang Province(No.LR26E010004).
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