Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 8, Pages 4658-4665Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.03.027
Keywords
MAX phase; High-entropy; Mechanical properties; Solid solution; Hot-pressing
Categories
Funding
- National Natural Science Foundation of China [11905194]
- China National Science and Technology Major Special Project [2015ZX06004-001]
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A novel strategy was developed to fabricate compositionally complex MAX phases, yielding solid solutions with distinct properties. These complex MAX phase solid solutions exhibit typical layered structures and show improved mechanical properties, providing a new avenue for tailoring the properties of these materials.
A novel strategy of fabricating compositionally complex MAX phases was successfully developed. Multicomponent 413 MAX phase solid solutions (Ti0.36Nb0.27Ta0.37)4AlC2.8 and (Ti0.28Nb0.26Ta0.28V0.18)4AlC2.9 simultaneously containing 3 and 4 transition-metal elements at M site were experimentally synthesized via hot pressing equimolar mixture of 211 type MAX phase powders. By elemental analysis and structural characterization, it can be verified that those uniform compositionally complex solid solutions can be obtained only in the presence of Cr2AlC in raw powders. Those compositionally complex MAX phase solid solutions exhibit typical layered structures with distinct elongated grains. This discovery further enriches the MAX phases family and provide a new avenue for tailoring the properties of these materials. MAX phase composites containing around 87.5 vol.% (Ti0.36Nb0.27Ta0.37)4AlC2.8 exhibit a high flexural strength of 720 MPa and a high fracture toughness of 9.5 MPa m0.5.
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