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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 5    October 2007

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Synthesis and grain growth kinetics of in-situ FeAl matrix nanocomposites(Ⅰ): Mechanical alloying of Fe-Al-Ti-B composite powder
REN Rong(任 榕), WU Yu-cheng(吴玉程), TANG Wen-ming(汤文明), WANG Feng-tao(汪峰涛), WANG Tu-gen(王涂根), ZHENG Zhi-xiang(郑治祥) School of Materials Science and Engineering,

Hefei University of Technology, Hefei 230009, China

Abstract:Three nanocrystalline alloys, Fe50Al50, Fe42.5Al42.5Ti5B10 and Fe35Al35Ti10B20 (molar fraction, %), were synthesized from elemental powders by high-energy ball milling. The structural evolutions and morphological changes of the milled powders were characterized by X-ray diffractometry(XRD), transmission electron microscopy(TEM) and scanning electron microscopy(SEM). The effects of different Ti, B additions on the structure and phase transformation in these alloys were also discussed. It is observed that the diffusion of Al, Ti, B atoms into Fe lattice occurs during milling, leading to the formation of a BCC phase identified as Fe(Al) or Fe(Al, Ti, B) supersaturated solid solution. Fe-based solid solution with nanocrystalline structure is observed to be present as the only phase in all the alloy compositions after milling. Furthermore, the contents of Ti, B affect the formation of mechanical alloying products, changes in the lattice parameter as well as the grain size.

 

Key words: FeAl; composite; mechanical alloying; structural evolution; nanocrystalline

ISSN 1672-7029
CN 43-1423/U

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