Formation of nanostructured eutectic network in alpha-Al2O3 reinforced Al-Cu alloy matrix composite

Yu, Peng, Deng, Cheng-Ji, Ma, Nan-Gang, Yau, Man-Yan and Ng, Dickon H. L. (2003) Formation of nanostructured eutectic network in alpha-Al2O3 reinforced Al-Cu alloy matrix composite. Acta Materialia, 51 12: 3445-3454. doi:10.1016/S1359-6454(03)00165-4


Author Yu, Peng
Deng, Cheng-Ji
Ma, Nan-Gang
Yau, Man-Yan
Ng, Dickon H. L.
Title Formation of nanostructured eutectic network in alpha-Al2O3 reinforced Al-Cu alloy matrix composite
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
Publication date 2003
Sub-type Article (original research)
DOI 10.1016/S1359-6454(03)00165-4
Volume 51
Issue 12
Start page 3445
End page 3454
Total pages 10
Place of publication Oxford
Publisher Pergamon-elsevier Science Ltd
Language eng
Subject 0912 Materials Engineering
Abstract We report the fabrication and characterization of an Al-Cu alloy matrix composite, which is reinforced by alpha-Al-2-O-3 particles and nanometer-sized (nm-sized) lamellar eutectic. The composite was fabricated by sintering and rapid quenching of an Al-20wt.%CuO sample. We had performed differential thermal analysis on the sample, and found that the reaction between Al and CuO took place between 580 and 700 degreesC. Results from scanning and transmission electron microscopies indicated that amorphous Al2O3 was initially formed in the reaction. It was then crystallized and transformed to the more stable alpha-Al2O3 particles at higher temperature. When the sintered sample was cooled down from 1000 degreesC, the two-phase Al(Cu)-Al2Cu eutectic was formed. The size and the distribution of the eutectic network strongly depended on the rate of cooling. The final sintered product contains alpha-Al2O3 particles and Al(Cu)-AlCu eutectic, which are embedded in the AI(Cu) matrix. In comparison, the eutectic network in the oil-quenched sample is distributed more evenly and is finer in size, with lamellar spacing as small as 200-300 nm, than that of the furnace-cooled sample. The Vickers hardness value of the oil-quenched sample has an average of 123, which is 50% higher than that of the furnace-cooled sample. (C) 2003 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
aluminum
copper
composite
in situ reaction
eutectic
Mechanical-properties
Nanocomposites
Microstructure
Fabrication
Solidification
System
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
 
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Created: Wed, 17 Oct 2007, 12:09:44 EST