中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 6 No. 3 September 1996 |
(Department of Materials Science and Engineering,Central South University of Technology, Changsha 410083)
Abstract:The evolution of microstructure in the oxidative growth of Al2O3/Al alloy composites was examined metallographically and analyzed by electron microprobe technique. The development of a nonprotective surface layer of MgO/MgAl2O4 allowed the continuous formation of an Al2O3-matrix composite containing an interpenetrating network of metal microchannels at 1 373 K. The role of Mg in the composite growth process was discussed by means of the lgaO2-YMgphase diagram assuming that local equilibrium was established at the phase boundaries.
Key words: oxide layer Al2O3/Al alloy composites oxygen activity