Journal
COMPOSITES PART B-ENGINEERING
Volume 39, Issue 2, Pages 327-331Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2007.01.010
Keywords
metal-matrix composites (MMCs); hardness; strength; powder processing; precipitation hardening
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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 degrees C was studied. In situ formed micron-sized alumina particles were present in the AI(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. (c) 2007 Elsevier Ltd. All rights reserved.
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