Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 22, Issue 9, Pages 2080-2086Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(11)61431-3
Keywords
Al matrix composite; spray co-deposition; heat treatment; solid solution; aging; microstructure; interface; fracture toughness
Categories
Funding
- Hunan Provincial Science and Technology Department, China [02Gky2004]
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The ultra high strength SiC particles (SiCp) reinforced Al-10%Zn-3.6%Mg-1.8%Cu-0.36%Zr-0.15% Ni composite was prepared by spray co-deposition. Microstructures of the extruded and different heat-treated bars were analyzed by transmission electron microscopy (TEM) and energy dispersive spectrometry (EDS). Grain size of the composites prepared by two-stage solution is smaller than that by single-stage solution. After single-stage solution aging treatment, fine precipitates of both. and AlZnMgCu-rich phase can be found both intragranularly and intergranularly. While after the two-stage solution, an amorphous Si-Cu-Al-O (5 nm) layer appears at the interface. The addition of Ni and Zr modified the influence of the two-stage solution and inhibited the growth of the 7090/SiCp composite grain size. Heat treatments can significantly improve the fracture toughness of the composite. The fracture toughness first decreases then increases with the elongation of the aging time.
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