(1.合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，合肥230009；
2.安徽理工大學(xué) 材料科學(xué)與工程學(xué)院，淮南232001)
摘 要: 利用無壓浸滲法制備高體積分?jǐn)?shù)SiC的SiCp/Al復(fù)合材料。采用XRD和SEM對復(fù)合材料的相組成、微觀組織及斷口形貌進行分析，研究顆粒粒徑分布和基體合金成分對復(fù)合材料抗彎性能的影響。結(jié)果表明：以Al-10Si-8Mg(質(zhì)量分?jǐn)?shù)，%)合金為基體制備的復(fù)合材料組織均勻，致密度好，無明顯氣孔缺陷；界面反應(yīng)產(chǎn)物為Mg2Si、MgAl2O4和Fe，其彎曲強度高于以Al-10Si合金為基體制備的復(fù)合材料的彎曲強度；SiCp/Al復(fù)合材料的彎曲強度隨著SiC顆粒粒徑的增大而減小；復(fù)合材料整體上表現(xiàn)出脆性斷裂的特征。
關(guān)鍵字: SiCp/Al復(fù)合材料；微觀組織；彎曲性能；無壓浸滲
with high volume fraction of SiCp
（1.School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;
2.School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China）
Abstract:The SiCp/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 SiCp/Al-10Si-8Mg(mass fraction, %) composites are quite uniform without obvious pores. The interfacial reaction products are Mg2Si, MgAl2O4 and Fe. The bending strength of the SiCp/Al-10Si-8Mg composites is better than that of the SiCp/Al-10Si composites. Besides, the bending strength of the SiCp/Al composites decreases with increasing particle size of SiCp. The composites have the character of brittleness fracture.
Key words: SiCp/Al composites; microstructure; bending strength; pressureless infiltration
