OBRABOTKAMETALLOV Vol. 25 No. 3 2023 technology Fig. 5. Surface expansion and pressure at the interlayer boundary during rolling of composite with reduction ratio of 30 % (a) and 45 % (b) а b subjected to a mechanical shear test to determine the bond strength, which was 43 MPa. The results of mechanical testing of the composite are presented in Table 1. The shear zone on the side of D16 alloy after testing is shown in fig. 6b, which shows characteristic “stretch lips”, indicating the cracking of oxide films, the extrusion of pure metals into cracks, and the formation of primary bonding. Similar “stretch lips” are also found in works [6, 10] devoted to the study of the bond strength between sheets from aluminum and aluminum alloys. Fig. 6b demonstrates that the “stretch lips” are located perpendicular to the rolling direction. Therefore, the cause of its appearance should be considered tensile stresses acting along the rolling direction. There are also individual particles of AMg3 alloy, which peeled off during the shear test and remained in the bond zone on the side of D16 alloy. This indicates the bonding between materials in these areas. Based on the results of computer and physical simulation, it can be seen that the primary bonding between the layer materials is achieved during rolling with a reduction of 45 %. To assess the effect of a
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