Microstructure and enhanced mechanical properties of ZrC/Zr composites added by in-situ Y2O3 reinforced particles
The in-situ hybrid particle-reinforcements are a novel strengthening mode for the advanced metal matrix composites . In this study, Zr matrix composites incorporating the fixed amount of ZrC particles with the different amounts of Y 2 O 3 particles were prepared by the in-situ reaction among Zr, graphite, Y, and ZrO 2 during the arc-melting. Results revealed that the graphite/Zr reaction produced the uniform in-situ ZrC particles in the Zr matrix, and the Y/ZrO 2 reaction formed the Y 2 O 3 particles. In-situ Y 2 O 3 addition refined the Zr matrix and led to the polygonal morphology of the ZrC particle. The coarser Y 2 O 3 grew in bulk, and some fine Y 2 O 3 dendrites were formed along Zr boundaries. The influence of different contents of Y 2 O 3 reinforcements on the hardness and compressive properties were analyzed. Compared with the single ZrC reinforcements, the hybrid Y 2 O 3 introduction resulted in a higher hardness and enhanced compressive strength . This hybrid structures were believed to be favorable to mechanical responses in the composites, and the relevant mechanisms for the hardening and strengthening effect of such hybrid forms were discussed.
危险品化学品经营许可证（带存储）