吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (5): 1534-1541.doi: 10.13229/j.cnki.jdxbgxb201705027

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Microstructures and mechanical properties of transient liquid phase diffusion bonded S355 steel/6005A aluminum alloy joint

GU Xiao-yan, LIU Ya-jun, SUN Da-qian, XU Feng, MENG Ling-shan, GAO Shuai   

  1. College of Materials Science and Engineering, Jilin University, Changchun 130022, China
  • Received:2016-12-15 Online:2017-09-20 Published:2017-09-20

Abstract: Transient liquid phase diffusion bonding of steel/aluminum alloy dissimilar metal joints was carried out with pure Cu foil as the interlayer. The microstructure and mechanical properties of the joints were analyzed by Scanning Electron Microscope (SEM), Energy Dispersion Spectrometer (EDS), X-ray Diffraction (XRD) and instron testing machine. Results show that, under the bonding condition of 580 ℃ and 15 min, layered structure appears in the joint. With the increase in holding time and bonding temperature, the width of diffusion zone increases, which indicates that sufficient reaction occurs at the interface, and the layered structure can not be observed obviously. However, cracks appear in the Fe-Al intermetallic compound layer near the steel side. The microhardness of the Fe-Al intermetallic compound layer adjacent to the steel side reaches 439 HV. When the holding time and bonding temperature are 30 min and 580 ℃, the joint shear strength reaches the highest, up to 77 MPa. At the beginning of the joining process, Cu foil added generates eutectic liquid to wet the surface of steel and aluminum alloy and blocks the interdiffusion between Fe and Al elements in the later joining process. Thus the joint quality can be ensured.

Key words: materials synthesis and processing technology, S355 steel, 6005A aluminum alloy, transient liquid phase diffusion bonding, Cu interlayer, intermetallic compounds

CLC Number: 

  • TG456.9
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