Advances in materials Research

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Mechanical and metallurgical properties of diffusion bonded AA2024 Al and AZ31B Mg

  • Mahendran, G. (IFET College of Engineering) ;
  • Balasubramanian, V. (CEMAJOR, Annamalai University) ;
  • Senthilvelan, T. (Podicherry Engineering College)
  • Received : 2012.05.19
  • Accepted : 2012.06.21
  • Published : 2012.06.25
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Abstract

In the present study, diffusion bonding was carried out between AZ31B magnesium and AA2024 aluminium in the temperature range of $405^{\circ}C$ to $475^{\circ}C$ for 15 min to 85 min and 5MPa to 20 MPa uniaxial loads was applied. Interface quality of the joints was assessed by microhardness and shear testing. Also, the bonding interfaces were analyzed by means of optical microscopy, scanning electron microscopy, energy dispersive spectrometer and XRD. The maximum bonding and shear strength was obtained at $440^{\circ}C$, 12 MPa and 70 min. The maximum hardness values were obtained from the area next to the interface in magnesium side of the joint. The hardness values were found to decrease with increasing distance from the interface in magnesium side while it remained constant in aluminium side. It was seen that the diffusion transition zone near the interface consists of various phases of $MgAl_2O_4$, $Mg_2SiO_4$ and $Al_2SiO_5$.

Keywords

References

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