摘要
通过显微组织观察和力学性能测试 ,初步探讨了ZrO2 +SiC颗粒对MoSi2 基体材料的强韧化效果和机制。结果表明 ,材料复合具有较好的强韧化协同效应 ,复合材料中ZrO2 相和少量SiC颗粒在基体的间层作用 ,可抑制MoSi2 晶粒长大 ;断口呈现晶粒细小、裂纹扩展曲折和沿晶与穿晶混合型断裂等特征 ;ZrO2 +SiC颗粒通过弥散强化和细化晶粒使复合材料强度提高 ,通过晶粒细化、裂纹偏转和分支。
ZrO 2+SiC particles reinforced MoSi 2 matrix composites by hot pressing have been studied. Through observation of the microstructure of MoSi 2 and the measurement of bending strength, microhardness and fracture toughness, the strengthening\|toughening mechanism of this materials is revealed. It is shown that the strengthening mechanism of the composites is the effect of dispersion strengthening and grain refining, and the toughening mechanism is a synthetic effect in terms of grain refining, microcrack forming, crack deflection and crack branching.
关键词
ZrO2+SiC
MOSI2
强韧化
显微结构
复合材料
ZrO_2 particle
\ MoSi_2 composite
\ strengthening\|toughening
\ microstructure
\ mechanical property
