VC_p和TiC_p颗粒增强Fe_3Al基合金的显微组织和力学性能

Effects of VC and TiC particles on mechanical properties and microstructure of Fe_3Al-based alloys

采用反应铸造法制备了含VC、TiC颗粒的Fe3Al基合金 ,并研究了颗粒相的加入对Fe3Al合金组织结构和力学性能的影响。研究表明 ,TiCp 可以细化Fe3Al合金铸锭组织 ,而VCp 的作用不明显 ,但可以细化热加工后的再结晶组织 ;同时发现 ,颗粒相的加入提高了Fe3Al合金在室温和 6 0 0℃下的屈服强度 ,而延伸率有稍许下降 。

Fe 3Al based alloys containing 1.0%～1.5% VC (mole fraction) and TiC particles were fabricated by melting and casting processes, and the effects of VC and TiC particles on microstructure and mechanical properties of the alloys were investigated. It was indicated that the formation of TiC particles results in the refinement of the microstructure of the ingots while the formation of VC particles has no this effect, however, can refine the microstructure after recrystallization. Meanwhile, addition of VC and TiC particles improves the yield strength at room temperature and decrease the ductility of the alloys slightly. The SEM observations showed that the formation of the particles affects the fracture mode of the alloys.