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SCIENCE CHINA Materials, Volume 64 , Issue 8 : 2037-2044(2021) https://doi.org/10.1007/s40843-020-1610-9

High-entropy carbide-nitrides with enhanced toughness and sinterability

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  • ReceivedDec 2, 2020
  • AcceptedJan 6, 2021
  • PublishedMar 12, 2021

Abstract


Funded by

This research was supported by the National Natural Science Foundation of China(51671021,51961160729,1179029,51871016,51971017)

the Funds for Creative Research Groups of China(51921001)

111 Project(B07003)

the Program for Changjiang Scholars and Innovative Research Team in University of China(IRT_14R05)

the Project of SKLAMM-USTB(2019Z-01)

the Project supported by State Key Laboratory of Powder Metallurgy

Central South University

Changsha

China.


Acknowledgment

This research was supported by the National Natural Science Foundation of China (51671021, 51961160729, 1179029, 51871016 and 51971017), the Funds for Creative Research Groups of China (51921001), 111 Project (B07003), the Program for Changjiang Scholars and Innovative Research Team in University of China (IRT_14R05), the Project of SKLAMM-USTB (2019Z-01) and the Project supported by the State Key Laboratory of Powder Metallurgy, Central South University, Changsha, China.


Interest statement

All authors declare that they have no conflict of interest.


Contributions statement

Liu X and Zhang P conceived the idea. Liu X and Lu Z supervised the project. Zhang P synthesized the samples and characterized the structural and mechanical properties. Zhang P, Liu X and Lu Z wrote the manuscript. All the authors analyzed the data and commented the manuscript.


Author information

Pan Zhang is a PhD student at the State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing (USTB), under Prof. Liu’s supervision. His research focuses on the fabrication and characterization of high-entropy ceramics and related powders.


Xiongjun Liu is currently a full professor at USTB. He received his PhD degree from USTB in 2008, and worked as a post-doctoral fellow at the Hong Kong Polytechnic University for two and half years, from 2009 to 2012. His research interests mainly focus on the metallic glasses, high-entropy materials, nanoporous metals and computational materials science.


Zhaoping Lu is currently a full professor at USTB. He received his PhD degree from National University of Singapore in 2001, and worked as a post-doctoral fellow at Oak Ridge National Laboratory for three years, from 2001 to 2004. His research interests mainly focus on the metallic glasses, high-entropy materials, nanoporous metals and computational materials science.


Supplement

Supplementary information

Experimental details and supporting data are available in the online version of the paper.


References

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  • Figure 1

    XRD patterns of the as-synthesized HECs: (a) HEC-1, (b) HEC-2 and (c) HEC-3. Arrows indicate the characteristic peaks of the pristine structures of the powders, and their disappearance is an indicator of the formation of HECs.

  • Figure 2

    SEM, TEM, and APT analyses of the as-synthesized HEC-3. (a) SEM images of secondary electron and energy-dispersive X-ray spectroscopy, (b) TEM images of SAED pattern and HRTEM image, (c) STEM image and corresponding EDS compositional maps and (d) APT image.

  • Figure 3

    (a) The relationship between configurational entropy and sintering temperature and (b) the configurational entropy as a function of the cation number of HECs with different anions.

  • Figure 4

    (a) Vickers hardness and Young’s modulus of HECs with the standard deviation of the error bar; (b) fracture toughness of HECs and the data reported in the literature [10,3843] with the standard deviation of error bar; (c) SEM image of Vickers indentation initiated by a load of 98 N on the well-polished surface of HEC-3; (d) SEM image of the fracture surface of HEC-3, indicating the presence of the ball-like particle boundary; (e) EDS compositional maps of (d).

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