High entropy six-component solid solution (Ti0.5Nb0.15Zr0.1Mo0.1Ta0.1W0.05)2AlC: A novel synthesis approach and its mechanical properties

High-entropy MAX phase (Ti0.5Nb0.15Zr0.1Mo0.1Ta0.1W0.05)2AlC was synthesized via current-assisted sintering using Ti/Al/NbC/ZrC/MoC/TaC/WC as the raw material. The phase composition, microstructure, and elemental distribution are analyzed by X-ray diffraction, scanning electron microscope and transm...

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Bibliographic Details
Published in:Ceramics international 2023-12, Vol.49 (23), p.39719-39723
Main Authors: Li, Mingling, Gao, Huamin, Wang, Xiaodong, Hu, Feng, Ji, Jun
Format: Article
Language:English
Subjects:
High-entropy ceramic
MAX phase
Mechanical properties
Solid solution
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Summary:High-entropy MAX phase (Ti0.5Nb0.15Zr0.1Mo0.1Ta0.1W0.05)2AlC was synthesized via current-assisted sintering using Ti/Al/NbC/ZrC/MoC/TaC/WC as the raw material. The phase composition, microstructure, and elemental distribution are analyzed by X-ray diffraction, scanning electron microscope and transmission electron microscope with energy-dispersive spectrometer elemental analysis. The results obtained indicate that the as-synthesized bulk exhibits high purity with minimal elemental segregation at the grain boundary. The doped atoms caused numerous dislocations and severe lattice distortions in the crystal structure. By means of mechanical properties tests, the hardness, flexural strength, and fracture toughness of (Ti0.5Nb0.15Zr0.1Mo0.1Ta0.1W0.05)2AlC are determined to be 9.3 ± 0.2 GPa, 433 ± 27 GPa, and 8.9 ± 0.3 MPa m1/2, respectively. These findings demonstrate notable enhancements in terms of hardening, strengthening, and toughening effects compared to the Ti2AlC phase.
ISSN:0272-8842
DOI:10.1016/j.ceramint.2023.09.254