Abstract
The peculiarities of joint formation in vacuum diffusion bonding through an intermediate multilayer foil (MF) of Al/Si produced by electron beam physical vapour deposition (EB-PVD) in vacuum were studied on SiCр/Al aluminium matrix composites with different alloying systems of the aluminium matrix. It is shown that Al/Si interlayer enables making permanent joints without degradation of the composite properties at the temperature of 500°С, which corresponds to the start of intensive plastic deformation of the interlayer at thermomechanical loading. It is found that the microstructure and phase composition of the joint zone (JZ) depend on the interlayer and aluminium matrix of the composite. It is demonstrated that reduction of the bilayer thickness of Al/Si MF and its alloying by manganese ensures intensive mass transfer of the components in the butt joint and equivalent joint formation. The maximum value of shear strength was 105 MPa in the case of an interlayer with a nano-scale period of the layers.
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