а
б
в
Figure 6. Stress distribution σ
х
on the boundary surface of aluminum and
titanium layers; a – α= 4°; b – α= 7°; в - α= 10°; =0,01
The analysis of the stress-strain state and the kinematics of the layer interaction
shows that conditions are created in the deformation zone that contribute to the
diffusion connection of the layers (Fig. 7):
- the maximum compressive stress on the limiting surface of the layers, the value
of which is close to the boundary of the layer flow with a lower yield strength;
- the difference in axial velocities of deformations and deformations of layers, as
well as the presence of shear deformations in the interaction of layers on the limiting
surface ensure the destruction of metal oxide films and the formation of juvenile
surfaces;
- alignment of the velocity of the metal layers in the zone close to the exit of the
matrix;
- the presence of heating layers to the activation temperature of their interaction.
Figure 7. Relationship of strain rates
у
,
difference the axial velocities of the
moving ∆V
у
and radial stresses
х
on the limiting surface of the layers in the
deformation cell
The process of drawing was performed for various combinations of materials,
performed on a special stamp, which provided automated measurement and recording
on the computer of the parameters of temperature, force and movement of the punch
relative to the matrix (Fig. 8). The stamp was mounted on the hydraulic press PD-476
(Fig. 9).
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