Member, American Ceramic Society.
Formation of Al2O3/Metal Composites by the Directed Oxidation of Molten Aluminum-Magnesium-Silicon Alloys: Part II, Growth Kinetics
Article first published online: 11 JUL 2005
Journal of the American Ceramic Society
Volume 75, Issue 2, pages 455–462, February 1992
How to Cite
Nagelberg, A. S., Antolin, S. and Urquhart, A. W. (1992), Formation of Al2O3/Metal Composites by the Directed Oxidation of Molten Aluminum-Magnesium-Silicon Alloys: Part II, Growth Kinetics. Journal of the American Ceramic Society, 75: 455–462. doi: 10.1111/j.1151-2916.1992.tb08201.x
C. A. Handwerker—contributing editor
Supported in part by the Defense Advanced Research Projects Agency and Office of Naval Research under Contract No. N00014–85–C-0015.
Technology patented by Lanxide Corporation and included under the Tradename DIMOXTM directed metal oxidation technology.
- Issue published online: 11 JUL 2005
- Article first published online: 11 JUL 2005
- Manuscript No. 196770. Received April 19, 1991; approved October 31, 1991.
The growth kinetics of an Al2O3/metal composite by the directed oxidation of an aluminum alloy (10 wt% Si, 3 wt% Mg, balance Al) have been measured as a function of temperature (1398 to 1548 K) and oxygen partial pressure in O2/Ar gas mixtures. The growth rate exhibited an activation energy of ∼370 kJ/mol and a dependence on oxygen partial pressure consistent with a Po1/42 relationship. A dissolution-precipitation growth mechanism is proposed in which the growth rate is controlled by the electronic conductivity of an external Al2O3-doped MgO surface layer in conjunction with grain boundary diffusion of magnesium.