EVOLUTION OF MICROSTRUCTURE IN OXIDATIVE GROWTH OF Al<SUB>2</SUB>O<SUB>3</SUB>/Al ALLOY COMPOSITES

ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 6 No. 3 September 1996

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EVOLUTION OF MICROSTRUCTURE IN OXIDATIVE GROWTH OF Al₂O₃/Al ALLOY COMPOSITES

Xia Changqing, Jin Zhanpeng

(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/MgAl₂O₄allowed 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 lga_O2-Y_Mgphase diagram assuming that local equilibrium was established at the phase boundaries.

Key words: oxide layer　Al₂O₃/Al alloy composites　oxygen activity

Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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