J. Mater. Sci. Technol. ›› 2023, Vol. 137: 91-99.DOI: 10.1016/j.jmst.2022.07.037

• Research Article • Previous Articles     Next Articles

A novel medium-entropy (TiVNb)2AlC MAX phase: Fabrication, microstructure, and properties

Guangqi Hea,b, Yi Zhangb,c, Pei Yaob,c, Xingchao Lid, Ke Mab, Jun Zuob, Meishuan Lib, Changsheng Liua, Jingjun Xub,*   

  1. aSchool of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;
    bShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    cSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;
    dScience and Technology on Advanced Functional Composites Laboratory, Aerospace Research Institute of Material and Processing Technology, Beijing 100076, China
  • Received:2022-05-27 Revised:2022-07-13 Accepted:2022-07-26 Published:2023-02-20 Online:2023-02-15
  • Contact: *E-mail address: jjxu@imr.ac.cn (J. Xu).

Abstract: Medium- or high-entropy materials have great potential for applications due to their diverse compositions and unexpected physicochemical properties. Herein, a novel medium-entropy (TiVNb)2AlC was synthesized via hot pressing at 1400 °C from three individual M2AlC (M=Ti, V, Nb) MAX phases. The microstructure of (TiVNb)2AlC was characterized from the microscale to the atomic scale by scanning electron microscope microscopy (SEM), scanning transmission electron microscopy (STEM), and energy dispersive spectroscopy (EDS). The results showed that Ti, V, and Nb atoms were fully solid-soluble in the M-sites of the M2AlC MAX phase. Compared with three individual MAX phases, the thermal conductivity of (TiVNb)2AlC was reduced greatly in the temperature range of 293-1473 K, and its mechanical properties (including Young's modulus, Vickers hardness, and bending strength) were all increased due to the solid solution strengthening and electronic mechanism.

Key words: Medium-entropy ceramics, MAX phases, Microstructure, Thermal properties, Mechanical properties