Effect of magnesium and silicon on the DIMOX processing of aluminum alloys
- Southwest Jiaotong Univ., Chengdu (China). Dept. of Materials Engineering
This paper deals with the reaction mechanisms of the DIMOX processing of aluminum alloys. Emphasis is placed on the distribution of Mg and Si in the products so that the behaviors of these two crucial elements for the oxidation aluminum could be revealed. Alterative methods, including optical and SEM microscopy, electron-probing and wave spectrum analysis were applied to specify the microstructure characters of the products and locate the position of both Mg and Si in the reaction products. It is shown that the products can be divided into four regions from where directly connected to the residual bulky metals to the surface area distinguished by microstructure. Both Mg and Si are rather concentrated in specific regions than homogeneously distributed in the whole products. The contents of Mg and Si in the surface region are not as high as expected with most of the Mg being concentrated in the region directly neighboring to the bulky metals and most of the Si in the residual bulky metals, although the contents of these two elements in the surface region are a little higher than the regions next to the surface. These characters, combined with other investigations, lead to the suggestion that circulated reactions could be a possible mechanism to explain the decisive role of the slight amount of Mg and Si in the nucleation and growth of Al{sub 2}O{sub 3}.
- OSTI ID:
- 77958
- Report Number(s):
- CONF-950201-; ISBN 0-87339-283-3; TRN: IM9531%%8
- Resource Relation:
- Conference: Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Las Vegas, NV (United States), 12-16 Feb 1995; Other Information: PBD: 1995; Related Information: Is Part Of In situ reactions for synthesis of composites, ceramics, and intermetallics; Barrera, E.V.; Marquis, F.D.S.; Frazier, W.E.; Fishman, S.G.; Thadhani, N.N.; Munir, Z.A.; PB: 226 p.
- Country of Publication:
- United States
- Language:
- English
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