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Gradient nanostructured metal material and preparation method thereof

A technology of metal materials and nanostructures, applied in the field of precision processing, can solve the problems that the toughness and strength of metal materials cannot be improved at the same time, achieve the effect of simple and easy to operate preparation method, realize use requirements, high material strength and material toughness

Active Publication Date: 2022-07-12
SHENZHEN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of this application is to provide a gradient nanostructure material and its preparation method, aiming to solve the problem that the processing methods in the prior art can only form a partial gradient nanostructure on the surface of the metal material, which leads to the inability to simultaneously improve the toughness and strength of the metal material The problem

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  • Gradient nanostructured metal material and preparation method thereof
  • Gradient nanostructured metal material and preparation method thereof
  • Gradient nanostructured metal material and preparation method thereof

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preparation example Construction

[0034] A first aspect of the embodiments of the present application provides a method for preparing a gradient nanostructured metal material, such as figure 1 shown, including the following steps:

[0035] S01. Provide n pieces of original metal materials, and use the equal-diameter angular extrusion process to perform extrusion processing on the original metal materials in different passes to obtain n pieces of metal materials with different grain sizes, wherein n is not less than 3;

[0036]S02. The n pieces of the metal material are respectively cut by a wire cutting process, and the impurity removal treatment is carried out to obtain n pieces of metal material sheets with different grain sizes;

[0037] S03. Provide the original metal material sheet and the coarse-grained metal material sheet, and arrange the n pieces of the metal material sheet in order according to the size of the crystal grains, and use the cumulative rolling welding process to carry out the rolling pr...

Embodiment 1

[0071] Pure copper gradient nanostructured metal material and preparation method thereof

[0072] Preparation method of pure copper gradient nanostructured metal material

[0073] The preparation method of pure copper gradient nanostructure metal material comprises the following steps:

[0074] Provide pure copper original metal material, wherein the original material is selected from pure copper bars with a diameter of 15mm and an average grain size of about 7μm;

[0075] The three pure copper bars were extruded for 4 passes, 6 passes and 8 passes respectively by the equal-diameter angular extrusion process to obtain 3 metal materials with different grain sizes; The treatment temperature is room temperature 25°C, the inner mold corner Φ where the channels intersect is 90°; the mold center angle Ψ where the channels intersect is 90° for equal-diameter angular extrusion treatment. Further, the average grain size of the pure copper material subjected to 4 passes of extrusion...

Embodiment 2

[0083] 6061 aluminum alloy gradient nanostructured metal material and preparation method thereof

[0084] Preparation method of 6061 aluminum alloy gradient nanostructured metal material

[0085] The preparation method of 6061 aluminum alloy gradient nanostructure metal material comprises the following steps:

[0086] Provide 6061 aluminum alloy raw metal materials, wherein the raw materials are selected from pure copper bars with a diameter of 15mm and an average grain size of about 7μm;

[0087] The three 6061 aluminum alloy bars were extruded for 4 passes, 6 passes and 8 passes respectively by the equal-diameter angular extrusion process to obtain 3 pieces of metal materials with different grain sizes; The temperature of the pressure treatment is room temperature 25°C, the inner die corner Φ where the channels intersect is 90°; the central angle Ψ of the die where the channels intersect is 90° for equal-diameter angular extrusion treatment. Further, the average grain si...

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Abstract

The present application relates to the technical field of precision machining, and provides a method for preparing a gradient nano-structured metal material, comprising the steps of: providing n pieces of original metal material, and using an equal-diameter angular extrusion process to separate the original metal materials for different passes. to obtain n pieces of metal materials with different grain sizes; the n pieces of the metal materials are respectively cut by a wire cutting process and subjected to impurity removal treatment to obtain n pieces of metal materials with different grain sizes Sheet; provide original metal material sheet and coarse-grained metal material sheet, and stack n pieces of the metal material sheet in order according to the size of the grain size, and perform stack rolling treatment in sequence by the cumulative stack rolling process to prepare the gradient nano-structured metal Material. The preparation method is simple and convenient, and has high flexibility, so that the obtained gradient nano-structured metal material can ensure high material strength and material toughness at the same time.

Description

technical field [0001] The present application belongs to the technical field of precision machining, and in particular, relates to a gradient nanostructure metal material and a preparation method thereof. Background technique [0002] The properties of metal materials determine the scope of application of the material and the rationality of its application. The properties of metal materials are mainly divided into four aspects, namely: mechanical properties, chemical properties, physical properties, and technological properties. Based on the excellent performance of metal materials in four aspects, their application fields are becoming more and more extensive. However, a large number of studies have shown that when the internal grain size of the metal material is reduced and the material strength is enhanced, the material toughness will be greatly reduced, which is a long-standing problem in the field of metal materials research, and the existence of this problem also limi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00C21D7/02C22F1/00C22F1/04C22F1/08
CPCB23P15/00C21D7/02C22F1/00C22F1/04C22F1/08
Inventor 陆建勋程涛伍博伍晓宇李岱阮双琛
Owner SHENZHEN TECH UNIV
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