Microstructure and composition characteristics of transition zone in diffusion bonding of Fe3Al intermetallics to Q235 low carbon steel
来源期刊：中国有色金属学报(英文版)2003年第z1期
论文作者：WU Hui-qiang(吴会强) FENG Ji-cai(冯吉才) LI Ya-jiang(李亚江) WANG Juan(王 娟)
文章页码：30 - 33
Key words：Fe3Al intermetallics; vacuum diffusion bonding; microstructure; element transition
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.
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
