骨架结构对SiC/Al双连续相复合材料的影响

用挤压铸造法制备了不同结构的SiC泡沫增强ZL109双连续相复合材料,研究了增强体骨架结构(筋的结构、泡沫孔和体积分数)对复合材料压缩性能和弯曲性能的影响。结果表明:SiC泡沫增强体的筋的结构影响了界面的结合,影响了材料的压缩性能;当筋具有三明治结构时,复合材料的强度最大;当筋具有双层结构时,复合材料的强度最低;随着SiC泡沫孔径的增大,复合材料的压缩强度、弹性模量和屈服强度都有所提高,材料的屈服应变减小,弯曲强度先升高后降低,弯曲强度在泡沫孔径为1.5 mm时达到最大值;复合材料的压缩强度随着增强体体积分数的增大而提高,屈服应变随着体积分数的增大而减小。

Effect of preform structure on SiC/Al co-continuous composites

The SiC/AI co-continuous composites reinforced by different structure SiC foam were fabricated, and the effects of preform structure on the mechanical properties were investigated. The results show that the structures of SiC foam strut play an important role to the compressive property of composites for changing the interface bond. The compressive strength of the composite reinforced by SiC foam with sandwich-structure strut is the highest, and that of the composite reinforced by SiC foam with double-layer strut is the lowest. With the increase of SiC foam aperture, the compressive strength, elastic modul and yield strength of the composites increase, but the ratio of compress decreases. The flexural strength gets the peak value when the aperture is 1.5 mm. With the increase of the volume fraction of SiC foam reinforcement, the compressive strength increases, but the ratio of compress decreases.