OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 24 No. 3 2022 The subsequent longer soaking of the material in the furnace does not lead to the growth of the intermetallic layer, which is apparently due to the ultimate extinction of diffusion processes. The formation of intermetallic interlayers along the weld of the composite armored material after heat treatment is shown in Fig. 6. X-ray phase analysis of intermetallic interlayers on a DRON3M diffractometer showed its composition corresponding to intermetallic TiAl3 [13]. The phase composition of the composite depending on the furnace holding time is shown in Fig. 7. The highly solid intermetallic layers (TiAl3) in the composite armor structure 2 contribute to the destruction of the ballistic object 1 into smaller parts, signifi cantly reducing its kinetic energy, and the highly viscous aluminum layers of the composite effectively retain the formed fragments 5 of the ballistic object. The scheme of composite armor operation in the presence of intermetallic layers is shown in Fig. 8. The mechanism of brittle cracks localization in the structure of a composite with intermetallic layers during ballistic impact on it is similar to that described above. Upon contact with the ballistic object 1, brittle cracks arising in it are formed and developed mainly in high-solid intermetallic layers 2 located along the aluminum-titanium welding zone. Spreading from the point of contact with the ballistic object 3 and reaching the point of transition from the edge of the perforation to the welding zone of the composite viscous metal base 4, the cracks stop on it, and its propagation stops (Fig. 8). Evaluation of the strength of the composite in the state after heat treatment showed its increase in the range from 610.7 to 633.8 MPa, however, there is a slight decrease in plasticity, characterized by relative elongation in the range from 2.1 to 2.7 %. Fig. 6. Microstructure of reinforced composite material based on light metals and alloys after heat treatment ×100 Fig. 7. The phase composition of the composite after annealing at a temperature of 625°C with different furnace holding time
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