CAJ | 학술논문

利用无压浸渗法制备高体积分数SiC的SiC_p/Al复合材料.采用XRD和SEM对复合材料的相组成、微观组织及断口形貌进行分析,研究颗粒粒径分布和基体合金成分对复合材料抗弯性能的影响.结果表明:以Al-10Si-8Mg(质量分数,%)合金为基体制备的复合材料组织均匀,致密度好,无明显气孔缺陷;界面反应产物为Mg2Si、MgAl_2O_4和Fe,其弯曲强度高于以Al-10Si合金为基体制备的复合材料的弯曲强度;SiC_p/Al复合材料的弯曲强度随着SiC颗粒粒径的增大而减小;复合材料整体上表现出脆性断裂的特征.
이용무압침삼법제비고체적분수SiC적SiC_p/Al복합재료.채용XRD화SEM대복합재료적상조성、미관조직급단구형모진행분석,연구과립립경분포화기체합금성분대복합재료항만성능적영향.결과표명:이Al-10Si-8Mg(질량분수,%)합금위기체제비적복합재료조직균균,치밀도호,무명현기공결함;계면반응산물위Mg2Si、MgAl_2O_4화Fe,기만곡강도고우이Al-10Si합금위기체제비적복합재료적만곡강도;SiC_p/Al복합재료적만곡강도수착SiC과립립경적증대이감소;복합재료정체상표현출취성단렬적특정.
The SiC_p/Al composites with high volume fraction of SiC were fabricated by pressureless infiltration technique. The microstructures and the fracture morphologies of composites were observed by SEM and the components were analyzed by XRD. The effects of the particle size distribution and the components of aluminum matrix on the bending strength of the composites were studied. The results show that the microstructures in the SiC_p/Al-10Si-8Mg(mass fraction, %) composites are quite uniform without obvious pores. The interfacial reaction products are Mg2Si, MgAl_2O_4 and Fe. The bending strength of the SiC_p/Al-10Si-8Mg composites is better than that of the SiC_p/Al-10Si composites. Besides, the bending strength of the SiC_p/Al composites decreases with increasing particle size of SiC_p. The composites have the character of brittleness fracture.