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METHOD FOR IMPROVING THE MECHANICAL CHARACTERISTICS OF NANOSTRUCTURED POLYCRYSTALINE METAL MATERIALS BY SEVERE PLASTIC DEFORMATION
METHOD FOR IMPROVING THE MECHANICAL CHARACTERISTICS OF NANOSTRUCTURED POLYCRYSTALINE METAL MATERIALS BY SEVERE PLASTIC DEFORMATION
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机译：严重塑性变形改善纳米结构多晶金属材料力学性能的方法
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摘要
The invention relates to a method for improving the final mechanical characteristics of polycrystalline materials, such as Young elasticity module or stretching resistance, which are nanostructured by severe plastic deformation, by using controlled multidirectional shearing. According to the invention, the method consists in changing the parameters of the severe plastic deformation, such as deformation path and deformation rate in metal materials having grain sizes of less than 50 nm, the optimal values of said parameters being calculated based on the correlation between the evolution of the deformation degree applied to the material to be nanostructured, on the one hand, and the evolution of the energetic profile of the dislocation channel, calculated as a free Gibbs potential energy, on the other hand, where the dislocation channel is assimilated with Chymotrypsin Inhibitor 2 protein chain which passes through a series of foldings-unfoldings marked in the energetic profile by state transitions, taking over from the protein the energetic profile which represents the entire folding-unfolding evolution over the considered interval, where the values of the parameters to be applied to a severe plastic deformation process can be determined so that the evolution of dislocation within the said material is similar to the geometrical evolution of the protein from its native folded state of maximal energy, to the denatured unfolded state of minimal energy and, finally, to a cumulation of known paths of the dislocation channels thereby resulting in ordered atom structures similar to the structures of native folded protein chains.
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