Gradient nano-structure metal material and preparation method thereof

A technology of metal materials and nanostructures, which is 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, and achieve the effects of simple and easy to operate preparation methods, fulfilling use requirements, and great flexibility
CN112872722AActive Publication Date: 2021-06-01SHENZHEN TECH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHENZHEN TECH UNIV
Publication Date
2021-06-01

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Abstract

The invention relates to the technical field of precision machining, and provides a preparation method of a gradient nano-structure metal material. The preparation method comprises the following steps: providing n original metal materials, and carrying out extrusion treatment of different passes on the original metal materials respectively through an equal channel angular extrusion process to obtain n metal materials with different grain sizes; cutting the n metal materials through a linear cutting process, and carrying out impurity removal treatment to obtain n metal material sheets with different grain sizes; providing the original metal material sheets and coarse-grain metal material sheets, and sequentially stacking the original metal material sheets, the coarse-grain metal material sheets and the n metal material sheets according to the grain sizes, and sequentially carrying out ply rolling treatment on the original metal material sheets, the coarse-grain metal material sheets and the n metal material sheets through an accumulation ply rolling welding process to prepare the gradient nano-structure metal material. The preparation method is simple and convenient, and flexibility is high, so that the obtained gradient nano-structure metal material can ensure high material strength and material toughness simultaneously.
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Description

technical field

[0001] The 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 performance of metal materials determines the scope of application of materials and the rationality of applications. The properties of metal materials are mainly divided into four aspects, namely: mechanical properties, chemical properties, physical properties, and process properties. Based on the excellent performance of the four aspects of metal materials, its 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 toughness of the material will be greatly reduced. Wide range of applications of materials.

[0003] Usually one of the strategies to improve the toughness of materials is to ch...

Claims

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