Investigation of the Effect of Melt Chemical Composition on the Mechanical Properties of Cu-Al Bimetal Obtained by Explosive Welding Near the Lower Limit of Weldability

In this work, using scanning electron microscopy, the joint zone of Cu-Al bimetal obtained by explosion welding near the lower limit of weldability was studied. Micro-X-ray spectral energy dispersive elemental analysis (EDS) of melts in the joint zone was carried out. It was revealed that the melts have a finely dispersed two-phase microstructure corresponding to the eutectic (Al) + θ. It was found that with an increase in the energy of plastic deformation W2 from 0.12 to 0.24 MJ/m2, the linear content of melts increases from 15 to 57%, and the ratio of Al/Cu elements changes from 80/20 to 50/50 At.%. In this case, the mechanical tear strength of bimetal layers with kinematic parameters corresponding to the intersection of the lower limit of weldability increases abruptly from zero to an equal strength value of 89 MPa.