Microstructure and mechanical properties of Nb–Mo–ZrB<sub>2</sub> composites prepared by hot-pressing sintering

Yuan Gao; Zong-de Liu; Qi Wang; Yong-tian Wang

doi:10.1007/s12613-018-1631-6

Volume 25 Issue 7

Jul. 2018

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International Journal of Minerals, Metallurgy and Materials > 2018 > 25(7): 824-831. > DOI: 10.1007/s12613-018-1631-6

Yuan Gao, Zong-de Liu, Qi Wang, and Yong-tian Wang, Microstructure and mechanical properties of Nb–Mo–ZrB₂ composites prepared by hot-pressing sintering, Int. J. Miner. Metall. Mater., 25(2018), No. 7, pp.824-831. https://dx.doi.org/10.1007/s12613-018-1631-6

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Research Article

Microstructure and mechanical properties of Nb–Mo–ZrB₂ composites prepared by hot-pressing sintering

Author Affilications

Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China

Funds:

This work was financially supported by the National Natural Science Foundation of China (No. 11372110).

Received: 08 November 2017; Revised: 10 February 2018; Accepted: 12 February 2018;

Graphical Abstract

Abstract

Abstract

Nb–Mo–ZrB₂ composites (V(Nb)/V(Mo)=1) with 15vol% or 30vol% of ZrB₂ were fabricated by hot-pressing sintering at 2000℃. The phases, microstructure, and mechanical properties were then investigated. The composites contain Nb-Mo solid solution (denoted as (Nb, Mo)ss hereafter), ZrB, MoB, and NbB phases. Compressive strength test results suggest that the strength of Nb–Mo–ZrB₂ composites increases with increasing ZrB₂ content; Nb–Mo–30vol%ZrB₂ had the highest compressive strength (1905.1 MPa). The improvement in the compressive strength of the Nb–Mo–ZrB₂ composites is mainly attributed to the secondary phase strengthening of the stiffer ZrB phase, solid-solution strengthening of the (Nb, Mo)ss matrix as well as fine-grain strengthening. The fracture toughness decreases with increasing ZrB₂ content. Finally, the fracture modes of the Nb–Mo–ZrB₂ composites are also discussed in detail.
- metal-matrix composites,
- microstructure,
- mechanical properties,
- sintering

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References

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