Welding of Al Alloys Through In Situ Fabrication of Al₃Ni Intermetallic Compound Using Combustion Synthesis

Abstract

The exothermic reactions in Al+Ni system were used as a power source for welding of Al1100 alloy so that the obtained joint was reinforced with in situ produced Al₃Ni intermetallic compound, simultaneously. Due to the combustion heat, the surfaces of the plates were melted down which, in turn, eventuated in formation of a strong surficial bond. The cross sections of joints were analyzed using optical microscopy, EDS-equipped scanning electron microscopy (SEM), and X-ray diffraction experiments. XRD and EDS results represented the Al₃Ni intermetallic compound as the reaction product. The compressive shear strength of the joint was 20 MPa.

Keywords:

• aluminum
• combustion synthesis
• intermetallics
• welding

Acknowledgments

The authors wish to thank vice president for research and technology of Ferdowsi University of Mashhad because of financial support (Grant No. 2.16121).