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Forced plasticity deforming method for preparing super fine crystal material

A technology of plastic deformation and ultra-fine grain, which is applied in the field of materials to achieve the effect of uniform and controllable deformation and simple device

Inactive Publication Date: 2007-06-27
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies and limitations of existing strong plastic deformation methods for preparing ultra-fine-grained materials, mainly the problems of process continuity and applied uniform deformation, and propose a strong plastic deformation method for preparing ultra-fine-grained materials. Rotary Shear

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  • Forced plasticity deforming method for preparing super fine crystal material
  • Forced plasticity deforming method for preparing super fine crystal material

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Embodiment Construction

[0016] The technical scheme of the present invention is further described below in conjunction with accompanying drawing and embodiment: embodiment is carried out under the premise of technical scheme of the present invention, has provided detailed implementation mode and concrete operation process, but protection scope of the present invention does not Limited to the following examples.

[0017] Find out according to Fig. 1, the mode of the shear processing material of the present invention: material plastic deformation takes place under certain pressure, then make it torsion under the effect of inner and outer ring surface friction force by the drive of mould, thereby produce Shear deformation is a strong plastic deformation method for processing materials.

[0018] Find out according to Fig. 2, the mold that the present invention uses comprises base, sleeve and torsion nut 3 parts, the position of the used aluminum ring in the mould: place the ring sample at the correspondi...

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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...

Claims

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Application Information

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IPC IPC(8): G01N1/28
Inventor 汪明亮单爱党
Owner SHANGHAI JIAO TONG UNIV
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