The Effect of Heat Treatment (T62) on the Tensile Shearing Test of Explosively Welded Layered Material AA2519-AA1050-Ti6Al4V

The article presents the results of shear testing during tensile loading of a layered material composed of: AA2519-AA1050-Ti6Al4V, before and after heat treatment. The described material was produced using a high-energy explosive welding method utilizing the detonation of ANFO (mixture of NH4NO3 and fuel oil). The research was based on monotonic loading of the material with increasing uniaxial load until separation between the gripping parts of the specimen was achieved. During the analysis of the research results, the obtained curves were compared, and a visual analysis of the obtained fractures was conducted. As a result of the conducted research, a significant impact of heat treatment on the described mechanical characteristics was demonstrated. The average value of maximum shear stresses decreased from 77.6 MPa for untreated specimens to an average of 66.3 MPa for heat-treated specimens. The heat treatment caused a slight but noticeable decrease in the tensile shear strength of the examined material. Fractures of the specimens obtained from the experiment confirm that, in studied cases, separation of individual fragments of specimens exhibited cohesive characteristics within interlayer material, regardless of whether material was heat treated. Results of this work is elimination of main doubts related to explosive welding of materials by indicating location of damage in technical objects. As demonstrated by the conducted research, in the case of the presented material, potential local post-weld delamination will not have a critical impact on the composite's strength. The separation-type damage is most likely to exhibit a cohesive nature within the mechanically weakest material (aluminum alloy 1050).