中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 12 No. 5 October 2002 |
SO2/Al matrix composites
reinforced with in situ formation
ceramic phases
（1. School of Materials Science and Engineering,
Hebei University of Technology, Tianjin 300132, China;
(2. Command Department, Institute of Military Traffic,
Tianjin 300161, China）
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.
Key words: in situ composites; interface; microstructure
