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

Vol. 31    No. 9    September 2021

[PDF]    [Flash]
Effect of Si content on interfacial reaction and properties between solid steel and liquid aluminum
Tian-peng Zou1, Gao-yang Yu1, Shu-hai Chen1, Ji-hua Huang1, Jian Yang1, Zhi-yi Zhao1, Ji-ping Rong1, Jin Yang2
(1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
)
Abstract: The effect of Si content on the microstructures and growth kinetics of intermetallic compounds (IMCs) formed during the initial interfacial reaction (<10 s) between solid steel and liquid aluminum was investigated by a thermophysical simulation method. The influence of Si addition on interfacial mechanical properties was revealed by a high-frequency induction brazing. The results showed that IMCs layers mainly consisted of η-Fe2Al5 and θ-Fe4Al13. The addition of Si reduced the thickness of the IMCs layer. The growth of the η phase was governed by the diffusion process when adding 2 wt.% Si to the aluminum melt. When 5 wt.% or 8 wt.% Si was added to aluminum, the growth was governed by both the diffusion process and interfacial reaction, and ternary phase τ19-(Al,Si)5Fe3 was formed in the η phase. The apparent activation energies of the η phase decreased gradually with increasing Si content. The joint with pure aluminum metal had the highest tensile strength and impact energy.
Key words: intermetallic compounds; Si content; solid steel; liquid aluminum; interfacial reaction; mechanical properties
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU) 湘ICP备09001153号-9