Forced plasticity deforming method for preparing super fine crystal material

Abstract

The mold composed of base, sleeve and torsion nut is adopted in the invention. Opening circular ring sample is placed on the base; next, sleeve is loaded and pressed; then the torsion nut is mounted. The mold with sample being loaded is placed on the platform. Using pressure acts on the sleeve vertically. When pressure reaches to a prearranged value, the pressure load is kept, and torsion nut is twisted. Thus, under action of shearing force, the material generates even plastic deformation. Afterward, under action of friction force of inner and outer toroid mold drives torsion so as to generate shearing deformation to treat material. The method generates larger amount of deformation in theory, and magnitude of amount of deformation can be controlled.

Description

technical field

[0001] The invention relates to a method in the technical field of materials, in particular to a strong plastic deformation method for preparing ultrafine-grained materials. Background technique

[0002] Since ultrafine-grained materials (including nanomaterials and submicrocrystalline materials) exhibit many unusual physical, chemical and mechanical properties (such as Curie temperature, Debye temperature, magnetic permeability, elastic modulus, diffusion coefficient, fracture strength , ductility and superplasticity at high strain rates at lower temperatures, etc.), these have gradually attracted people's attention, and the research results have been widely reported. The preparation of ultrafine-grained materials generally includes the synthesis and preparation of powder, block and thin film, and the preparation methods can be divided into three categories: chemical method, physical method and mechanical method. The mechanical method is the main method for...

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