Si含量对Mo-Si系金属间化合物组织结构与性能的影响

Effects of Si content on microstructure and properties of intermetallic compounds for Mo-Si binary system

研究了Si含量对电弧熔炼Mo-Si系金属间化合物组织结构和室温硬度及断裂韧度的影响。结果表明:随着Si含量的增加,Mo-Si系金属间化合物的裂纹和孔隙增多、致密度下降。Si组元决定了熔炼组织过渡相的形貌,Si较少时,过渡相呈岛状弥散分布,Si较多时,过渡相呈网状分布在基体相中。室温硬度及断裂韧度随Si含量增加而下降。

Effects of Si content on microstructure, hardness and fracture toughness at room temperature of intermetallic compounds for Mo-Si binary system fabricated by are melting technology were investigated. The results show that with the increase of the Si content, the number of cracks and pores increases and relative density decreases. Si element determines the morphology of transition phases of arc-melted intermetallic compounds of the Mo-Si system. For lower content of Si, transition phase is island-like and dispersively distributed, whereas in case of higher content of Si, transition phase is retieularly distributed within matrix. Hardness and fracture toughness at room temperature decrease with increasing the content of Si.