Interfacial microstructure of 20% SO₂/Al matrix composites reinforced with in situ formation ceramic phases

来源期刊：中国有色金属学报(英文版)2002年第5期

论文作者：孙继兵 李国彬 崔春翔 安雅琴 刘世敏 李杰民 韩瑞平

文章页码：899 - 903

Key words：in situ composites; interface; microstructure

Abstract: Al matrix composites reinforced with in situ ceramic phases by adding 20% SiO₂ were fabricated by powder metallurgy process. The interfacial microstructure of the composites was studied by means of SEM and HREM. It was shown that the ceramic phases mainly composed of spinel MgAl₂O₄ are formed in situ in the original SiO₂ particle and the size of small MgAl₂O₄ crystallites is about dozens of nanometers, which can adjacent to Al and Si. MgO could not found in original SiO₂ particle but a little in matrix and may exist with Si, Mg₂Si and Al. Si is mostly distributed in matrix and forms some segregation zones. The size of Mg₂Si is about 50~100nm and can usually be seen in the matrix.