摘要
Nb-Mo-ZrB2 composites （V（Nb）/V（Mo） = 1） with 15v01% or 30v01% of ZrB2 were fabricated by hot-pressing sintering at 2000~C The phases, microstxucture, and mechamcal 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 oftke stiffer ZrB phase, sol- id-solution strengthening oftke （Nb, Mo）ss matrix as well as fme-grain strengtkening. The fracture toughness decreases with increasing ZrB2 content. Finally, the fracture modes oftke Nb-Mo-ZrB2 composites axe also discussed in detail.
Nb-Mo-ZrB2 composites （V（Nb）/V（Mo） = 1） with 15v01% or 30v01% of ZrB2 were fabricated by hot-pressing sintering at 2000~C The phases, microstxucture, and mechamcal 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 oftke stiffer ZrB phase, sol- id-solution strengthening oftke （Nb, Mo）ss matrix as well as fme-grain strengtkening. The fracture toughness decreases with increasing ZrB2 content. Finally, the fracture modes oftke Nb-Mo-ZrB2 composites axe also discussed in detail.
作者
Yuan Gao
Zong-de Liu
Qi Wang
Yong-tian
yuan gao;zong-de liu;qi wang;yong-tian wang(Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education,North China Electric Power University,Beijing 102206,China)
基金
financially supported by the National Natural Science Foundation of China(No.11372110)
