Method for preparing large nanocrystalline magnesium alloy through small deformation

A magnesium alloy and nanocrystalline technology, which is applied in the field of preparation of new nanocrystalline materials, can solve problems such as cracking, unobvious mechanical properties, and poor surface quality of magnesium alloy plates, so as to reduce recrystallization temperature, inhibit grain growth, The effect of suppressing the growth of crystal grains

Inactive Publication Date: 2016-10-26
BEIJING UNIV OF TECH
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Problems solved by technology

However, this surface nanotechnology can only form an influence layer of several hundred microns on the surface of the sample. If the thickness of the plate is relatively thick, the influence of this nano-scale fine-grained layer on the overall mechanical properties of the material is very insignificant.
Moreover, the surface quality of the magnesium alloy sheet prepared by surface nanotechnology is poor, and there are a lot of surface oxidation and cracking.

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  • Method for preparing large nanocrystalline magnesium alloy through small deformation
  • Method for preparing large nanocrystalline magnesium alloy through small deformation
  • Method for preparing large nanocrystalline magnesium alloy through small deformation

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Embodiment Construction

[0026] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0027] Such as figure 1 As shown, the following embodiments involve a three-step process including: alloy smelting, room temperature rolling and low temperature short-term heat treatment, wherein:

[0028] In the smelting process of the magnesium alloy, 5% by weight of Ag particles is added, and the addition temperature is 720° C., and at (both volume ratio) 98% CO 2 +2% SF 6 Fully stir the magnesium melt under the smelting protective atmosphere and cast it after standing for 15 minutes. The casting temperature of the alloy is 700°C, and the preheating temperature of the metal mold used for casting is 200°C. Su...

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Abstract

The invention provides a method for preparing a large nanocrystalline magnesium alloy through small deformation. The method includes three processes of magnesium alloy smelting, cold plasticity deformation and low-temperature short-time thermal treatment. The method is characterized in that a small amount of Ag is added in the alloy smelting process; after casting and ingot forming, the small-deformation cold plastic deformation is applied at the room temperature; and a sample is subjected to thermal treatment for a short time at the lower temperature after deformation, and after 1 pass to 8 passes of repeated cold plastic deformation and thermal treatment, the nanocrystal magnesium alloy material with the even grain size is obtained finally, wherein the grain size ranges from 40 nm to 100 nm.

Description

technical field [0001] The invention relates to a preparation technology of a novel nanocrystalline material, in particular to a technology suitable for magnesium alloys with small deformation for preparing bulk nanocrystalline materials. Background technique [0002] Magnesium alloy is currently the lightest metal structure material in practical application, and it is being increasingly widely used in the fields of national defense, aerospace, automobile, electronic communication and so on. Compared with other light metal structural materials such as aluminum alloys and titanium alloys, magnesium alloys have poorer strength and toughness. In order to improve the strength of magnesium alloys, it is an effective means to refine the grains of magnesium alloys by plastic deformation. Large plastic deformation technology (SPD) has a remarkable ability to refine grains, and can refine the grain structure of materials to submicron or even nanometer levels. The most promising met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C23/00C22F1/06
CPCC22C1/02C22C23/00C22F1/06
Inventor 周浩肖礼容沙学超王立华毛圣成韩晓东张泽
Owner BEIJING UNIV OF TECH
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