Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 4    April 2010

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Microstructure of in situ Al3Ti/6351Al composites fabricated with electromagnetic stirring and fluxes
LI Gui-rong(李桂荣), WANG Hong-ming(王宏明), ZHAO Yu-tao(赵玉涛),
CHEN Deng-bin(陈登斌), CHEN Gang(陈 刚), CHENG Xiao-nong(程晓农)

Institute of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China

Abstract: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 ℃ 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 μm to 2−4 μm, 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 μm to 1−2 μm due to the formation of Ca2Si.

 

Key words: 6351 Al alloy; microstructure; in situ particle reinforced aluminum composites; electromagnetic stirring; fluxes

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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