Enhanced precipitation hardening in an alumina reinforced Al–Cu alloy matrix composite

Yu, Peng, Kwok, C. K., To, C. Y., Lia, T. K. and Ng, Dickon H. L. (2008) Enhanced precipitation hardening in an alumina reinforced Al–Cu alloy matrix composite. Composites Part B: Engineering, 39 2: 327-331. doi:10.1016/j.compositesb.2007.01.010


Author Yu, Peng
Kwok, C. K.
To, C. Y.
Lia, T. K.
Ng, Dickon H. L.
Title Enhanced precipitation hardening in an alumina reinforced Al–Cu alloy matrix composite
Journal name Composites Part B: Engineering   Check publisher's open access policy
ISSN 1359-8368
Publication date 2008-03-01
Sub-type Article (original research)
DOI 10.1016/j.compositesb.2007.01.010
Volume 39
Issue 2
Start page 327
End page 331
Total pages 5
Place of publication Oxford, U.K.
Publisher Elsevier Science
Language eng
Subject 0912 Materials Engineering
Abstract An alumina reinforced Al–Cu alloy matrix composite was prepared by reaction sintering of Al and CuO powders. Precipitation hardening by further aging the composite at 250 °C was studied. In situ formed micron-sized alumina particles were present in the Al(Cu) matrix of the un-aged composite, while additional nanometer-sized Al2Cu rods were obtained in the matrix of the aged composite. Both hardness and bending strength were enhanced after the composite was aged. In the bending test, the sample was plastically deformed before fracture. Microstructural analysis revealed that the size of dimples found in the fracture mouth of the un-aged composite was micron-sized, and that in the aged composite was much smaller. It was evident that when the composite was subjected to stress, micron-sized alumina particles were responsible for the formation of cracks in the un-aged sample, while in the aged sample, Al2Cu nanorods were the dominant nucleation sites for crack growth. Copyright © 2007 Elsevier Ltd
Keyword Metal-matrix composites (MMCs)
Hardness
Strength
Powder processing
Precipitation hardening
Q-Index Code C1
Q-Index Status Provisional Code
Additional Notes Available online 17 February 2007.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Engineering Publications
 
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