Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 9 No. 3 September 1999|
（1. Department of Materials Science and Engineering,Hebei University of Technology, Tianjin 300130, P.R.China;
2. Materials School, Harbin Institute of Technology, Harbin 150006, P.R.China）
Abstract:The preferred internal oxidation of aluminum in Cu-Al alloy was used to obtain in-situ Al2O3/Cu composites. The reinforcement particles were mainly γ-Al2O3, some θ-Al2O3 and a little α-Al2O3. Thermodynamics analyses show that the chemical reactions are 3Cu2O+2Al=6Cu+Al2O3 or 3CuO+2Al=3Cu+Al2O3. A related equilibrium diagram was drawn. The experiments and investigation show that the formation rate of Al2O3 was controlled by the diffusion of oxygen in matrix.
Key words: Al2O3/Cu composites; internal oxidation; thermodynamics; kinetics