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. 13    Special 1    May 2003

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Microstructure and composition characteristics of transition zone in diffusion bonding of Fe3Al intermetallics to Q235 low carbon steel
WU Hui-qiang(吴会强)1, FENG Ji-cai(冯吉才)1,
LI Ya-jiang(李亚江)2, WANG Juan(王 娟)2

1. National Key Laboratory of Advanced Welding Production Technology,
 Harbin Institute of Technology,Harbin 150001, China;
2. Key Lab of Liquid Structure and Heredity of Materials,
Shandong University, Jinan 250061, China

Abstract:The sound joints of Fe3Al intermetallics and Q235 low carbon steel dissimilar materials were made by vacuum diffusion bonding process at 1050-1100℃,9.8MPa held for 1h. Microstructure and composition characteristics at the interface of Fe3Al/Q235 were studied by means of scanning electron microscopy(SEM), X-ray diffractometry(XRD), electron probe micro-analysis(EPMA) and transmission electron microscopy(TEM). The results indicate there exits FeAl phases and α-Fe (Al) solid solution near the Fe3Al/Q235 interface. Aluminum content decreases from 28% to 1.5% and corresponding phase changes from Fe3Al with DO3 type body-centered cubic (bcc) structure to α-Fe (Al) solid solution, and both structures have an orientation relationship of crystal (11-0)α-Fe(Al)(011)Fe3Al and [001]α-Fe(Al)[100]Fe3Al. Based on this, a formation mechanism of the interface structure was elucidated.

 

Key words: Fe3Al intermetallics; vacuum diffusion bonding; microstructure; element transition

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

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

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