Cast-shaped architectures formed by methods of intensive plastic deformation
DOI:
https://doi.org/10.37142/2076-2151/2023-1(52)50Keywords:
Lithomimetic, architecture materials, severe plastic deformation, high pressure torsion.Abstract
Beigelzimer Y., Kulagin R., Estrin Y., Davydenko O., Dmytrenko V. Cast-shaped architectures formed by methods of intensive plastic deformation.
One of the most effective concepts of modern materials science - materials with internal architecture (architectured materials), consists in the maximum possible use of those reserves that the structure of the material provides for the formation of its properties. The article describes a new approach to the creation of such materials, based on the fact that compositions of different metals are subjected to high shear under high pressure. For this, the currently well-developed methods of severe plastic deformation (SPD) are used: torsion under high pressure, equal channel angular pressing, twist extrusion, etc. Researchers have shown that SPD treatment leads to a strong connection of the components of the composition with each other and the controlled formation of multiscale structures in it. At the lower scale level, nanostructures are created, the main element of which is non-equilibrium high-angle grain boundaries with a thickness of about 1 nm. At intermediate scale levels, with a characteristic element size of the order of 1-100 μm, mesostructures are formed similar to those observed in the earth's lithosphere: folds, boudins, vortex structures, kink bands, shear bands, etc. Hence the name of the new approach - litomimetics. There is reason to believe that this way can be used to create new materials with high fracture toughness and properties that are usually not combined together, for example: high strength, high plasticity, low Young's modulus, low density, good biocompatibility, etc.
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