累积叠轧SiC_p/MWCNTs混杂增强镁基纳米复合材料的组织与性能

Microstructure and properties of hybrid SiC_p/MWCNTs reinforced magnesium matrix nanocomposite fabricated by accumulative roll bonding

通过累积叠轧(ARB)成功制备了带有不同混杂比例的nano-SiC_p和MWCNTs纳米颗粒增强镁基纳米复合材料,其中增强相总质量分数为2%,ARB过程共进行14道次。研究结果发现,在混杂增强相添加后,纯镁基体的晶粒尺寸得到明显细化;当SiC_p/MWCNTs质量混杂比为5∶5或7∶3时,混杂增强相在纯镁基体中呈现弥散分布;混杂增强相较两种单一增强相更加强烈地抑制了基体的再结晶。以综合性能作为标准,当SiC_p/MWCNTs的混杂质量比为7∶3时混杂增强复合材料的综合性能表现最优。

Magnesium hybrid nanocomposite reinforced with different hybrid ratios of SiCp/MWCNTs was successfully fabricated by accumulative roll bonding（ ARB）. The total mass fraction of reinforcements was 2%,and the ARB processes were conducted for fourteen times. The results show that the grains of Mg matrix are obviously refined after adding the nanosized reinforcements; the dispersibility of reinforcement is fine at the mass hybrid ratio of 5∶ 5 or 7∶ 3 for SiCp/MWCNTs; the hybrid reinforcements further hinder the recrystallization of Mg matrix compared to monolithic SiCpor MWCNTs. Based on the comprehensive properties,the hybrid nanocomposite has the best performance at the mass hybrid ratio of 7∶ 3 for SiCp/MWCNTs.