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Dynamic plastic deformation of metal-matrix composites

The mode of dynamic plastic deformation of metal-matrix composites based on aluminum and titanium is realized by the method of multiple magnetic-pulse pressing of powders. To obtain a different degree of deformation, the height of the compacts or the multiplicity of the pressing were varied. The initial powders with the “metal core - strong shell” structure were obtained by the method of electric explosion of the corresponding wires, followed by passivation. It was found that as a result of plastic deformation, these shells are destroyed and their fragments uniformly strengthen the metal matrix. This effect is enhanced by additional heating of the powder to 400°C during pressing. This approach makes it possible to increase the microhardness of pure Al and Ti by a factor of 5 to 1.2 and 5.7 GPa, respectively. In this case, the electrical resistance of aluminum and the plasticity of titanium composites are comparable with the corresponding characteristics of pure metals.