Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 9 No. 4 December 1999|
（School of Materials Science and Engineering; Harbin Institute of Technology; Harbin 150001; P. R. China；
State Key Laboratory of Metal Matrix Composites; Shanghai Jiao Tong University; Shanghai 200030; P. R. C）
Abstract:Aging behaviors of submicron Al2O3p/6061 composite were investigated by Vickers hardness (HV) measurement and transmission electron microscope (TEM) observation. The results showed that there was an idiographic microstructure and aging characteristic in the composite. Addition of fine Al2O3 particulates would strongly restrain the precipitation and reduce the thermal mismatch dislocation density due to the difference of coefficient of thermal expansion (CTE) between the matrix and the reinforcemertt.
Key words: composite materials; particulates; aging; precipitation; vacancies