SiC<sub>P</sub>/AZ80镁基复合材料的界面与断口特征

SiC_P/AZ80镁基复合材料的界面与断口特征

摘要: 本文用SEM,TEM研究了SiC颗粒增强AZ80镁合金复合材料的界面结构和断口形貌。结果表明,SiC颗粒与镁合金界面结合紧密,没有发生界面化学反应,但在界面处可以观察到Mg₁₇Al₁₂共晶相在SiC表面形核生长。对复合材料断口观察表明,SiC颗粒与镁合金界面之间的粘结强度大于基体的撕裂强度,SiC颗粒的聚集、团聚是导致复合材料断裂的主要原因,且复合材料的断裂形式趋向脆性断裂。

Abstract: The interface and fracture surface of SiC_P/AZ80 composites were examined by SEM and TEM. It showed that the interface was very smooth and there was no chemical reaction, but the Mg₁₇Al₁₂ eutectic phase nucleated on SiC surface can be observed at the interface. Examination of the fracture surface indicated that the bonding strength between SiC and matrix alloy was stronger than that of matrix. The SiC particles segregation is the maincause of the SiC_P/AZ80 composite failure.