Microstructure and mechanical properties of Nb–Mo–ZrB2 composites prepared by hot-pressing sintering |
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作者姓名: | Yuan Gao Zong-de Liu Qi Wang Yong-tian Wang |
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作者单位: | Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China |
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基金项目: | This work was financially supported by the National Natural Science Foundation of China |
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摘 要: | 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.
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关 键 词: | metal-matrix composites microstructure mechanical properties sintering |
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