Growth of Al2O3/Al composites from Al-Zn alloys13

Hanabe, Murali and Jayaram, V and Bhaskaran, TA (1996) Growth of Al2O3/Al composites from Al-Zn alloys13. Acta Materialia, 44 (2). pp. 819-829.

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Abstract

Observations are presented here of the initiation and growth of an A1 203 /Al composite by the directed oxidation of a molten binary Al-Zn alloy with and without preforms. The oxidation behaviour into free space begins with the formation of ZnO on the melt surface followed by a second stage of relatively high growth rate associated with the constant presence of ZnO and a final region of slow growth rate during which the surface consists of both ZnO as well as A1 203 . Composite formation is explained13; on the basis of a cyclic formation and reduction by molten aluminium of ZnO. Oxidation was carried out with ternary Mg additions into A12O3 preforms of different particle sizes. The infiltration of an A1 203 preform is governed by reaction induced wetting between alloy and ZnO. Nucleation of the alumina is epitaxial with respect to particles of the preform and growth rates are higher than that for composite growth into free space.

Item Type:	Article
Additional Information:	Copyright belongs to Elsevier
Uncontrolled Keywords:	Alloys;Nucleation:Molten aluminium;epitaxial
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User:	Mr. N A
Date Deposited:	02 Jun 2006
Last Modified:	13 Aug 2015 07:59
URI:	http://nal-ir.nal.res.in/id/eprint/1561

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