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2616433 
Journal Article 
Microstructure of in situ Al3Ti/6351Al composites fabricated with electromagnetic stirring and fluxes 
Li Gui-rong; Wang Hong-ming; Zhao Yu-tao; Chen Deng-bin; Chen Gang; Cheng Xiao-nong 
2010 
1 
Transactions of Nonferrous Metals Society of China
ISSN: 1003-6326 
20 
4 
577-583 
WOS:000278013200007 
The 6351 wrought aluminum alloy and K2TiF6-CaF2-LiCl components were selected as raw materials to fabricate in situ Al3Ti particulate reinforced aluminum alloy at 720 degrees C via direct melt reaction method with electromagnetic stirring (EMS). CaF2 and LiCl acted as fluxes to lower the reaction temperature of the system. It is shown that the electromagnetic stirring and fluxes accelerate the emulsion process of K2TiF6. Optical microscopy, scanning electron microscopy, transmission electron microscopy and energy dispersive spectrum were utilized to analyze the microstructure and components of composites. Compared to composites fabricated without EMS and fluxes, the sizes of endogenetic Al3Ti are refined from 10-15 mu m to 2-4 mu m, which are often accompanied with silicon element. The morphology of Al3Ti or Al3TiSi0.22 exhibits triangle, quadrilateral and other clumpy patterns. Because of the Ca elements from CaF2, the sizes of Mg2Si decrease from 8-10 mu m to 1-2 mu m due to the formation of Ca2Si. 
6351 Al alloy; microstructure; in situ particle reinforced aluminum composites; electromagnetic stirring; fluxes