吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (4): 1037-1041.doi: 10.13229/j.cnki.jdxbgxb201404021

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Thermodynamic analysis of Al-Fe intermetallic compounds formed by dissimilar joining of aluminum and galvanized steel

HUANG Jian-kang1, HE Cui-cui1, 2, SHI Yu1, FAN Ding1   

  1. 1.State Key Laboratory of Gansu Advanced Nonferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China;
    2.Department of Mechanical and Electrical Engineering, Langfang Yanjing Career Technical College, Langfang 065200, China
  • Received:2013-01-09 Online:2014-07-01 Published:2014-07-01

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Abstract: The interface of welding joint of aluminum and steel was analyzed using XRD, EDS and the related phase diagram. It was observed that a large number of Al-Fe Intermetallic Compounds (IMC), e. g. Fe2Al5 and FeAl3, was formed in the joint interface. In order to study the relationship between Al-Fe IMC and the welding temperature, a model for Gibbs free energy calculation in the formation of Al-Fe IMC was established based on the basic law of thermodynamics. The Gibbs free energy of Al-Fe IMC with the variation of the temperature was simulated using this model. The results show that the primary Al-Fe IMCs in the interface are Fe2Al5 and FeAl3. The Gibbs free energy for the generation of Fe2Al5 is lower than that of FeAl3, so Fe2Al5 is generated prior to FeAl3 in the welding process of joining of aluminum and galvanized steel.

Key words: metallic materials, joining of aluminum to steel, intermetallic compounds, thermodynamic analysis

CLC Number: 

  • TG111
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