阅读说明：本技术 一种高熵合金颗粒增强金属基复合材料及其制备方法 (High-entropy alloy particle reinforced metal matrix composite material and preparation method thereof ) 是由 袁战伟 刘欢 田文斌 张学敏 于 2020-06-23 设计创作，主要内容包括：本发明公开了一种高熵合金颗粒增强金属基复合材料及其制备方法,包括以下步骤；1.取两块同等大小的金属板,将高熵合金颗粒均匀涂覆于金属板的表面,然后将两块金属板依次进行堆叠、铆接和轧制,形成复合板；2.对复合板进行累积叠轧焊,累积叠轧焊的每一道次,均进行裁剪、堆叠和铆接,直到叠层厚度达到所需厚度,形成复合材料；3.对累积叠轧焊完成后的复合材料进行热处理,使高熵合金颗粒与金属板之间形成扩散层,得到高熵合金颗粒增强金属基复合材料。得到具有强度提高且塑韧性得到良好发挥的高熵合金颗粒增强金属基复合材料。(The invention discloses a high-entropy alloy particle reinforced metal matrix composite material and a preparation method thereof, and the preparation method comprises the following steps; 1. taking two metal plates with the same size, uniformly coating high-entropy alloy particles on the surfaces of the metal plates, and then sequentially stacking, riveting and rolling the two metal plates to form a composite plate; 2. performing accumulative roll welding on the composite plate, and cutting, stacking and riveting each pass of the accumulative roll welding until the thickness of the laminated layer reaches the required thickness to form a composite material; 3. and carrying out heat treatment on the composite material after the accumulative stitch welding is finished, so that a diffusion layer is formed between the high-entropy alloy particles and the metal plate, and obtaining the high-entropy alloy particle reinforced metal matrix composite material. The high-entropy alloy particle reinforced metal matrix composite material with improved strength and good exertion of plasticity and toughness is obtained.)

1. A preparation method of a high-entropy alloy particle reinforced metal matrix composite is characterized by comprising the following steps;

step one, two metal plates (2) with the same size are taken, high-entropy alloy particles (1) are uniformly coated on the surfaces of the metal plates (2), and then the two metal plates (2) are sequentially stacked, riveted and rolled to form a composite plate;

step two, performing accumulative roll welding on the composite plate, and cutting, stacking and riveting each pass of the accumulative roll welding until the thickness of the laminated layer reaches the required thickness to form the composite material;

and thirdly, carrying out heat treatment on the composite material subjected to the accumulated stitch welding to form a diffusion layer between the high-entropy alloy particles (1) and the metal plate (2), so as to obtain the high-entropy alloy particle (1) reinforced metal-based composite material.

2. A method for preparing a high-entropy alloy particle-reinforced metal matrix composite according to claim 1, wherein in the first step, before the high-entropy alloy particles (1) are coated, the metal plate (2) is subjected to surface treatment until fresh metal is exposed on the surface.

3. A method for preparing a high-entropy alloy particle-reinforced metal matrix composite according to claim 2, wherein the surface treatment comprises the steps of:

step 1, cleaning oil stains on the surface of an aluminum plate by using acetone;

step 2, soaking the surface of the metal plate (2) cleaned by acetone in alkali liquor for 20-40 minutes, wherein the alkali liquor adopts 2% NaOH solution, and then washing and drying the alkali liquor by using deionized water;

and 3, cleaning the surface by using a steel wire brush to expose fresh metal on the surface.

4. The preparation method of the high-entropy alloy particle-reinforced metal matrix composite material as claimed in claim 1, wherein in the first step, the high-entropy alloy particles (1) are coated on the surface of the metal plate (2) in a slurry coating or slurry spraying mode.

5. A method for preparing a high-entropy alloy particle-reinforced metal matrix composite material as claimed in claim 1, wherein cold rolling is performed at a temperature of 20-500 ℃.

6. A preparation method of a high-entropy alloy particle-reinforced metal matrix composite material as claimed in claim 1, wherein the pass of the cumulative lap-welding is 4-20 passes.

7. The preparation method of the high-entropy alloy particle-reinforced metal matrix composite material as claimed in claim 1, wherein the temperature during the heat treatment is 500-1200 ℃, and the heat preservation time is 6-24 hours.

8. A method for producing a high entropy alloy particle reinforced metal matrix composite material according to claim 1, wherein the metal plate (2) is made of one or more of Al, Mg, Cu, Ti, Ni, Fe, Au and Ag.

9. A method for preparing a high-entropy alloy particle-reinforced metal matrix composite material according to claim 1, wherein the high-entropy alloy particles (1) are selected from Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn and Mo.

10. The high-entropy alloy particle reinforced metal matrix composite is characterized by comprising a high-entropy alloy particle layer and a metal plate (2) which are overlapped in a staggered mode in sequence.

Technical Field

The invention belongs to the field of metal-based composite materials, and relates to a high-entropy alloy particle reinforced metal-based composite material and a preparation method thereof.

Background

The particle reinforced metal-based composite material is a heterogeneous mixture which takes metal and alloy thereof as a matrix and takes metal or nonmetal particles as a reinforcing phase. The key to the superior performance of the composite material is whether good interfacial bonding is produced at the interface between the matrix phase and the reinforcement phase. At present, the main components frequently used for the particle-reinforced metal matrix composite reinforcement include silicon carbide particles, boron nitride particles and the like, most of which are non-metallic particles, and are difficult to form a stable and effective metallurgical interface with metal particles. In recent years, metal-based reinforcements, such as magnesium-based, iron-based, zirconium-based amorphous materials and the like, have been developed to form a stable and effective bonding interface with a metal matrix, but due to the limitation of the crystallization temperature of the amorphous material, the sintering process is difficult to be performed at a higher temperature, which affects the densification of the material, whereas high-entropy alloys containing various components have good bonding with the metal matrix and can realize the densification of composite materials.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a high-entropy alloy particle reinforced metal matrix composite material and a preparation method thereof, so that the high-entropy alloy particle reinforced metal matrix composite material with improved strength and good plasticity and toughness is obtained.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

a preparation method of a high-entropy alloy particle reinforced metal matrix composite material comprises the following steps;

step one, taking two metal plates with the same size, uniformly coating high-entropy alloy particles on the surfaces of the metal plates, and then sequentially stacking, riveting and rolling the two metal plates to form a composite plate;

step two, performing accumulative roll welding on the composite plate, and cutting, stacking and riveting each pass of the accumulative roll welding until the thickness of the laminated layer reaches the required thickness to form the composite material;

and step three, carrying out heat treatment on the composite material after the accumulative stitch welding is finished, so that a diffusion layer is formed between the high-entropy alloy particles and the metal plate, and obtaining the high-entropy alloy particle reinforced metal matrix composite material.

Preferably, in the first step, before the high-entropy alloy particles are coated, the metal plate is subjected to surface treatment until fresh metal is exposed on the surface.

Further, the surface treatment step is:

step 1, cleaning oil stains on the surface of an aluminum plate by using acetone;

step 2, soaking the surface of the metal plate cleaned by the acetone in an alkali liquor for 20-40 minutes, wherein the alkali liquor adopts a 2% NaOH solution, and then washing and drying the metal plate by using deionized water;

and 3, cleaning the surface by using a steel wire brush to expose fresh metal on the surface.

Preferably, in the step one, the high-entropy alloy particles are coated on the surface of the metal plate in a slurry coating or slurry spraying mode.

Preferably, the rolling is carried out by cold rolling, and the cold rolling temperature is 20-500 ℃.

Preferably, the number of pass of the cumulative lap welding is 4-20.

Preferably, the temperature for the heat treatment is 500-.

Preferably, the metal plate is made of one or more of Al, Mg, Cu, Ti, Ni, Fe, Au and Ag.

Preferably, the high-entropy alloy particles are selected from Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn and Mo elements.

A high-entropy alloy particle reinforced metal matrix composite comprises a high-entropy alloy particle layer and a metal plate which are sequentially overlapped in a staggered mode.

Compared with the prior art, the invention has the following beneficial effects:

the method carries out accumulative overlaying and rolling welding on the metal plate and the high-entropy alloy particle layer, the composite plate subjected to accumulative overlaying and rolling welding has extremely high density, the high-entropy alloy particles and the metal plate layer are alternated, then the composite plate is obtained after accumulative overlaying and rolling welding and heat treatment, in the heat treatment process, the high-entropy alloy reinforcement and the metal plate are subjected to good phase diffusion, excellent interface bonding strength is obtained, the mechanical bonding and infiltration and dissolution bonding modes of the high-entropy alloy reinforcement and the metal plate are realized, the process flow is greatly simplified, the production period is shortened, and the production efficiency is greatly improved.

Furthermore, the composite material can be densified in the preparation process at low temperature by rolling at low temperature, the deformation amount is large in the forming process, the crystal grains of the metal matrix are finer, and the distribution of the high-entropy alloy particle reinforcement is more uniform.

Furthermore, the thickness of the lamination is controlled by controlling the pass of the accumulated overlaying rolling welding, so that the operation is simple and the economy is excellent.

Furthermore, the mode of adding the cushion block and adjusting the flattening roller spring is adopted, so that the metal plate can be prevented from swinging left and right in the rolling process when the metal plate is too thin in the rolling process.

Drawings

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a metallographic microstructure of example 1 of the present invention before heat treatment;

FIG. 3 is a metallographic microstructure of the sample of example 1 of the present invention after heat treatment;

FIG. 4 is the distribution of elements after heat treatment in example 1 of the present invention.

Wherein: 1-high entropy alloy particles; 2-metal plate.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

as shown in fig. 1, the invention is a flow chart of a preparation method of the sandwich-like structure high-entropy alloy particle reinforced metal matrix composite material, and the preparation method comprises the following steps:

step one, two metal plates 2 with the same size are taken, a metal sheet is adopted in the embodiment, and the metal plates 2 are subjected to surface treatment, wherein the surface treatment comprises the following steps:

step 1, cleaning oil stains on the surface of an aluminum plate by using acetone;

step 2, soaking the surface of the material cleaned by acetone in alkali liquor, then washing with deionized water and drying;

and 3, cleaning the surface by using a steel wire brush to expose fresh metal on the surface.

The high-entropy alloy particles 1 are uniformly coated on the surfaces of the metal plates 2, slurry coating or slurry spraying is adopted as a spraying mode, then the two metal plates 2 are sequentially stacked, riveted and rolled to form the composite plate, and cold rolling is adopted for rolling.

The riveting finger is used for punching two metal sheets with the same size at the same position of one end, and riveting the two metal sheets at the position of the punched hole by using a rivet made of a metal sheet material.

The metal plate 2 is made of one or more of Al, Mg, Cu, Ti, Ni, Fe, Au, and Ag.

The high-entropy alloy particles 1 are selected from Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn and Mo elements.

And step two, performing accumulative roll welding on the composite plate, wherein each pass of the accumulative roll welding is subjected to middle cutting, stacking and riveting until the thickness of the laminated layer reaches the required thickness, so as to form the composite material. The thickness of the lamination is controlled by the rolling pass in the accumulative roll welding process, the rolling pass is 4-20 passes according to different requirements of the thickness of the lamination, and the mechanical combination of the high-entropy alloy particles 1 and the metal plate 2 is realized. When the metal plate 2 is too thin in the rolling process, a cushion block is added at the bottom of the metal plate 2, the spring of the flattening roller is adjusted, when the distance between the flattening rollers is too large, the spring of the flattening roller is screwed, and when the distance between the flattening rollers is too small, the spring of the flattening roller is loosened.

And step three, carrying out heat treatment on the composite material after the accumulated stitch welding is finished, and selectively realizing two combination modes of mechanical combination, mechanical combination-infiltration and dissolution. The temperature during heat treatment is the temperature during heat treatment, the heat preservation time is the time during which the diffusion of elements between the reinforcement of the high-entropy alloy particles 1 and the aluminum matrix is realized by adjusting the heating temperature and the heat preservation time, so that a diffusion layer is formed between the high-entropy alloy particles 1 and the metal plate 2, the infiltration and dissolution combination of the high-entropy alloy particles 1 and the metal plate 2 is realized, the interface bonding strength is improved, and finally the sandwich-structure-like high-entropy alloy particle reinforced metal matrix composite material is obtained.