CN105562662A - Method for preparing bimetallic composite through combination of solid-liquid compounding and drawing of solid aluminum materials - Google Patents

Abstract

The invention discloses a method for preparing a bimetallic composite material through solid-liquid compounding and drawing combination of solid aluminum materials; the method includes the steps of preparing a bimetallic drawing blank by solid-liquid composite casting, and drawing the blank to prepare a bimetallic composite material. Material steps. The present invention is characterized in that it utilizes the technological means of solid-liquid connection after surface zinc layer protection, which solves a series of problems such as oxidized slag inclusion, gas absorption, thermal cracking, and component segregation that are easy to occur when traditional welding methods are used to connect aluminum and other materials, and overcomes It solves the problem that an oxide film is easily formed on the surface of aluminum to hinder the formation of metallurgical bonding between aluminum and other materials, and then it is formed by drawing to break the intermediate compound formed on the interface during the solid-liquid composite process, improving the bimetallic composite material. And the mechanical and physical properties of the matrix material. The invention requires no gas protection, simple composite technology, wide process conditions and easy operation, simple process equipment requirements, high interface bonding strength and good electrical conductivity.

Description

Method for preparing bimetallic composite material by solid-liquid composite and drawing combination of solid aluminum material

technical field

The invention belongs to the field of preparation of bimetallic composite materials, in particular to a method for preparing bimetallic composite materials through solid-liquid composite and drawing combination of solid aluminum materials, especially a method for preparing bimetallic composite materials through solid-liquid composite casting and drawing combination process Composite method.

Background technique

With the development of modern industrial technology, the requirements for the comprehensive performance of materials are getting higher and higher. Under many working conditions, it is difficult for a single component metal material to meet the requirements. Bimetallic composite material is a new type of composite material prepared by combining two metals with different properties through various composite technologies. Compared with single-element metal materials, bimetallic composite materials can comprehensively utilize the physical and chemical properties of the two metal materials to obtain comprehensive properties that single-element metals cannot have at the same time, which can better meet the rapid development of industry and technology. Higher and higher requirements are placed on materials.

Aluminum alloy material is one of the most widely used light metal materials in industry. Due to a series of advantages such as good electrical conductivity, thermal conductivity, high specific strength, and good corrosion resistance, it is widely used in aerospace, military manufacturing, shipbuilding, metallurgy, chemical industry, energy power, packaging anticorrosion, and daily necessities. After investigation, it is found that bimetallic composite materials between aluminum alloy materials and other materials, such as magnesium alloys, zinc alloys, and aluminum alloys, have also received extensive attention. For example, aluminum-magnesium bimetallic composite materials are applied to automobile structural parts and automobile engine blocks, taking advantage of the strength, corrosion resistance and light weight of aluminum alloys, as well as the advantages of light weight of magnesium alloy materials. Aluminum-aluminum bimetallic composites are used in automotive structural parts to integrate the different physical and chemical properties of aluminum alloys in various systems.

Various defects often occur when bimetallic composites are fabricated using traditional welding methods. For example, when preparing aluminum-aluminum bimetallic composite materials by welding, a series of problems such as oxidation slag inclusion, gas absorption, thermal cracking, and composition segregation often occur. When aluminum-magnesium bimetallic composites are prepared by welding, it often occurs that the intermediate compound is too thick to affect the properties of bimetallic composites. According to the retrieval of the prior art, it is found that the common methods besides the welding method can be divided into solid-liquid composite, solid-solid composite and liquid-liquid composite according to the state of the material. For the solid connection method, such as extrusion, the production efficiency is high, but because aluminum is very easy to oxidize in the atmosphere, especially under high temperature conditions, a dense oxide film will be formed between the two metals, and the existence of the oxide film will be serious. It hinders the interaction between the two metals, deteriorates the quality of the connection, and makes it difficult to form a good metallurgical bond. The liquid-liquid connection is often limited by the equipment, and there are very strict requirements on the shape and size of the material, which also limits the promotion and application of copper-aluminum bimetallic materials to a certain extent. Compared with solid-solid composite and liquid-liquid composite, solid-liquid composite technology has simple procedures, less constraints on shape conditions, simple process equipment requirements, and higher production efficiency, and is receiving more and more attention. However, solid-liquid composites also have certain deficiencies. After searching, it was found that Zhang et al. published Improved Interfacial Bonding in Magnesium/Aluminum Overcasting Systems by Aluminum Surface Treatments (optimizing aluminum-magnesium bimetallic materials through aluminum alloy surface treatment) in the journal "Metallurgical and Materials Transactions B" 2014,45(6):2495-2503. Interface connection) mentioned that in the liquid-solid composite process, when the pouring temperature is high, it is easy to generate a thicker intermediate compound on the interface, which affects the bonding strength and physical properties of the copper-aluminum bimetallic composite. It can be seen that each method has its unique advantages, but also has certain limitations.

When using the traditional welding method to prepare bimetallic composite materials, due to the great difference in physical properties between copper alloy and aluminum alloy, such as melting point, specific heat capacity, linear expansion coefficient, etc. A series of problems such as oxidation slag inclusion, gas absorption, thermal cracking, and composition segregation appear. According to the search of the prior art, it is found that, in addition to the welding method, the common methods of copper-aluminum compounding can be divided into solid-liquid compounding, solid-solid compounding and liquid-liquid compounding according to the state of the material. For the solid connection method, such as drawing, the production efficiency is high, but because aluminum and copper are very easy to oxidize in the atmosphere, especially under high temperature conditions, a dense oxide film will be formed between the two metals, and the oxide film The presence of it will seriously hinder the interaction between the two metals, deteriorate the quality of the connection, and make it difficult to form a good metallurgical bond. The liquid-liquid connection is often limited by the equipment, and there are very strict requirements on the shape and size of the material, which also limits the promotion and application of copper-aluminum bimetallic materials to a certain extent. Solid-liquid composite is less restricted by shape conditions and requires simple process equipment, but when the pouring temperature is high, it is easy to form a thicker intermediate compound on the interface, which affects the bonding strength and physical properties of copper-aluminum bimetallic composites. Each method has its own unique advantages, but also certain limitations.

A further search of the prior art found that researchers began to prepare copper-aluminum bimetallic composites by combining two composite methods to overcome the shortcomings of a single method. Chinese patent CN102626854A discloses a method for producing all-clad copper-aluminum composite row by explosion and rolling. This technology uses the combination method of explosive welding and rolling to prepare copper-aluminum bimetallic composite materials. Two solid-solid connection methods are used in the process, and the surface is not specially treated, so there will be an oxide film on the interface of the two metals. The shape requirements are higher. Chinese patent CN101364459A discloses a production method and equipment for a copper-clad aluminum busbar. This technology uses extrusion and hot rolling to prepare copper-aluminum bimetallic composite materials, but because it uses two solid connection methods, and in order to avoid the influence of oxide film, inert gas protection is introduced in the heat treatment process. and higher preparation conditions.

Contents of the invention

In view of the defects in the prior art, the purpose of the present invention is to provide a method for preparing bimetallic composite materials by solid-liquid composite and drawing combination of solid aluminum materials, so as to solve the problem that the existing composite technology often leads to the formation of oxidized slag inclusions and gas absorption in the bonding area. , thermal cracking, composition segregation, and the existence of oxide film seriously affects the interaction between the two metals and the low performance of bimetallic composites, etc., so that the metallurgical bonding between the two aluminum alloys is formed, which has excellent mechanical properties.

The present invention is achieved through the following technical solutions:

The invention provides a method for preparing a bimetal composite material by solid-liquid compounding and drawing combination of a solid aluminum material. The method includes the steps of preparing a bimetal drawing blank by solid-liquid composite casting, and drawing the blank to prepare a bimetal composite material. A step of.

Preferably, the step of preparing a bimetallic drawing blank by solid-liquid composite casting specifically includes:

Treatment and preset: Surface treatment is performed on the solid aluminum preset material to be connected, and it is preset in the mold cavity after treatment;

Casting combination: pour the liquid material to be poured into the cavity of the mold, and cast to form a bimetallic drawing blank.

Preferably, the preset solid aluminum material includes pure aluminum, cast aluminum alloy, and deformed aluminum alloy, and the casting material is a metal or an alloy of the metal whose melting point is lower than or equal to the solid aluminum material; wherein, the metal includes Aluminum, magnesium, zinc, etc. When the pouring material is aluminum, because there are many types of aluminum, although they are all aluminum, you can choose different types of aluminum, and you can also combine the different performance advantages of different aluminum to obtain a dual-purpose aluminum alloy with excellent performance. metal composites.

Preferably, in the pre-treatment step, the surface treatment specifically refers to a galvanized protective layer;

Preferably, the implementation of the galvanized protective layer includes electroplating, chemical plating, hot-dip galvanizing, thermal spraying, vapor deposition, etc.; the thickness of the zinc protective layer is 0.1-50 μm. If the zinc layer is too thin, it will vaporize before pouring, and the surface will then oxidize, which cannot play a protective role. An excessively thick zinc layer cannot completely dissolve into the castable material, resulting in a failure to form a metallurgical bond. Or there is zinc aggregation at the metallurgical bonding interface, which will affect the performance of the bimetallic composite.

Preferably, in the step of combining casting, the casting method includes sand casting, metal casting, low pressure casting, high pressure casting, vacuum casting, squeeze casting, centrifugal casting and the like.

Preferably, in the step of casting bonding, the pouring temperature is 450-800°C; if the pouring temperature is lower than 450°C, it may cause difficulty in filling the mold, and at the same time, it is difficult to melt the surface zinc layer, so metallurgical bonding cannot be formed. Higher than 800°C may cause severe melting of the aluminum strip, which loses its significance as a high-performance pre-material; further preferably, the pouring temperature is 450-720°C.

Preferably, in the step of drawing the blank to prepare a bimetallic composite material, the drawing method includes one or a combination of straight drawing, continuous straight drawing, coil drawing, spinning, and tube rolling processing methods The drawing temperature is -100 to 100°C below the melting point of the castable material; the drawing diameter reduction ratio is 1/100 to 90/100; the drawing diameter reduction speed is 10 to 400m/min. When the drawing temperature is lower than -100°C, the formability is poor, and defects such as cracks will appear during the drawing process. Castable materials and even solid aluminum prefabricated materials may melt at temperatures above the upper limit. If the diameter reduction ratio is lower than 1/100, there is basically no deformation effect, and the damage effect on the intermediate compound is very weak. There will be a thicker intermediate compound on the interface of the obtained material, which will affect the performance. The diameter reduction ratio is higher than 90/100, which requires high molding performance of equipment/materials, and is prone to defects such as cracks. The diameter reduction is higher than 400m/min, the deformation speed is fast, and defects such as cracks are prone to occur. And below 10m/min, the production efficiency is low. More preferably, the drawing temperature is 200-500°C.

Preferably, the step of drawing the blank to prepare the bimetallic composite material further includes annealing the obtained bimetallic composite material after drawing, and taking up the wire.

Preferably, the temperature of the annealing treatment is 100° C. to 100° C. below the melting point of the casting material, and the time of the annealing treatment is 5 to 300 minutes. When the temperature is lower than 100°C or the time is less than 5 minutes, the effect of stress relief cannot be achieved, and the effect is weak, and it is difficult to react, resulting in poor performance of the bimetallic composite. When the temperature is higher than the upper limit or the time is longer than 300min, the two metals react violently, and the thickness of the intermediate compound layer will be very thick. The hard and brittle nature of the intermediate compound will affect the performance of the bimetallic composite material, or cause the casting material or even the solid aluminum to preset. The material melts and cannot form the desired bimetallic composite. Further preferably, the temperature of the annealing treatment is 100-500°C.

Preferably, the step of drawing the blank to prepare the bimetallic composite material further includes annealing the obtained bimetallic drawn blank before drawing.

Preferably, the temperature of the annealing treatment is 100° C. to 100° C. below the melting point of the casting material, and the time of the annealing treatment is 0 to 300 minutes. Drawing can be performed without heat treatment before drawing. Such as heat treatment before drawing and pressing, when the temperature is less than 100 ℃, the effect of stress relief cannot be achieved. When the temperature is higher than the upper limit or the time is longer than 300min, the two metals react violently, the thickness of the intermediate compound layer will be very thick, and defects such as cracks may appear, which will affect the drawing process and the performance of the obtained bimetallic composite material, or cause Castable materials and even solid aluminum preforms melt and cannot form the desired bimetallic composite.

Compared with other existing technologies, the present invention has the following beneficial effects:

1. Compared with the traditional welding method, it avoids the occurrence of problems such as oxidation slag inclusion, gas absorption, thermal cracking, and composition segregation;

2. Compared with the single liquid-liquid composite method, it has lower requirements for equipment, and lower requirements for the shape and size of materials;

3. Compared with the single solid-solid composite method, the problem of surface oxide film is solved, and a uniform and continuous zinc layer can be formed on the surface of the solid aluminum prefabricated material, so that the physical properties of the bimetallic composite material can reach a higher level;

4. Compared with the single solid-liquid composite method, it solves the problem that a thicker intermediate compound will be formed on the interface when the pouring temperature is not well controlled, and improves the mechanical and physical properties of the bimetallic composite material. Compared with the single solid-liquid composite method Composite, the shear performance has nearly doubled. At the same time, the properties of aluminum and castable matrix materials have also been improved.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

Fig. 1 is a schematic diagram of preparing a bimetallic composite material by combining solid-liquid composite casting and drawing after solid aluminum material is preset; wherein, 1 is the solid aluminum preset material, and 2 is the pouring material.

detailed description

The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

Fig. 1 is a schematic diagram of the preparation of a bimetallic composite material by solid-liquid composite casting and drawing combination in the following embodiment; wherein, 1 is the solid aluminum preset material, and 2 is the pouring material.

Example 1

This embodiment relates to a method for preparing a bimetallic composite material by solid-liquid compounding and drawing combination of solid aluminum, including the following steps:

Step 1. Perform thermal spraying zinc surface treatment on the solid 6101 extruded aluminum alloy material to be connected, and the thickness of the zinc layer is 10 μm;

Step 2. Presetting the surface-treated solid 6101 extruded aluminum alloy at the required position in the mold cavity;

Step 3: Melt the AZ91 magnesium alloy in the resistance furnace and pour it into the mold cavity. Using the processing technology of squeeze casting, the pouring temperature is 700 ° C, and the squeeze casting pressure is 60 MPa to form a metallurgical bond between aluminum and magnesium;

Step 4: Perform annealing treatment on the obtained 6101-AZ91 aluminum-magnesium bimetal drawing blank before drawing, the annealing temperature is 100°C, the annealing time is 300min, and then the drawing process is continued, the process is direct drawing, and the drawing temperature is 200°C, the diameter reduction ratio is 30/100, and the drawing speed is 30m/min;

Step 5. Put the obtained aluminum-magnesium bimetallic composite material into an annealing furnace for post-drawing annealing treatment. The annealing temperature is 200° C. and the annealing time is 30 minutes, and then the finished product is taken up.

After testing, it was found that there were no defects such as oxidized slag inclusions, air suction, and thermal cracks in the bonding area. A metallurgical bond is formed between the two materials, and there is a continuous distribution of intermetallic compounds in the interface area, indicating that a metallurgical bond is formed between the two metals (see Figure 1). After testing, the mechanical properties of the aluminum-magnesium bimetal composite are good, and the shear strength is 46MPa.

Example 2

This embodiment relates to a method for preparing a bimetallic composite material by solid-liquid compounding and drawing combination of solid aluminum, including the following steps:

Step 1. Electrogalvanizing surface treatment is performed on the solid A356 cast aluminum alloy preset material to be connected, and the thickness of the zinc layer is 0.1 μm;

Step 2, presetting the surface-treated solid A356 cast aluminum alloy in the required position in the mold cavity;

Step 3: Melt the AZ31 magnesium alloy in the resistance furnace and pour it into the mold cavity. Using the processing technology of squeeze casting, the pouring temperature is 660°C, and the squeeze casting pressure is 30MPa, so that the metallurgical bond between aluminum and magnesium is formed;

Step 4: Perform annealing treatment on the obtained A356-AZ31 aluminum-magnesium bimetallic drawing blank before drawing, the annealing temperature is 300°C, the annealing time is 50min, and then continue the drawing process, the process is continuous straight drawing, the drawing temperature The temperature is 200℃, the diameter reduction ratio is 60/100, and the drawing degree is 20m/min;

Step 5. Put the obtained aluminum-magnesium bimetallic composite material into an annealing furnace for post-drawing annealing treatment. The annealing temperature is 100° C. and the annealing time is 50 minutes, and then the finished product is taken up.

After testing, it was found that there were no defects such as oxidized slag inclusions, air suction, and thermal cracks in the bonding area. A metallurgical bond is formed between the two materials, and there is a continuous distribution of intermetallic compounds in the interface area, indicating that a metallurgical bond is formed between the two metals. After testing, the mechanical properties of the aluminum-magnesium bimetal composite are good, and the shear strength is 56MPa.

Example 3

This embodiment relates to a method for preparing a bimetallic composite material by solid-liquid compounding and drawing combination of solid aluminum, including the following steps:

Step 1. Perform thermal spraying zinc surface treatment on the solid pure aluminum preset material to be connected, and the thickness of the zinc layer is 15 μm;

Step 2. Presetting the surface-treated solid solid pure aluminum at the required position in the mold cavity;

Step 3: Melt the ZA-12 zinc alloy in the resistance furnace and pour it into the mold cavity. Using the metal mold casting process, the pouring temperature is 700 ° C to form a metallurgical bond between aluminum and zinc;

Step 4, drawing the obtained pure aluminum-ZA-12 aluminum-zinc bimetal, the process is direct drawing, the drawing temperature is 250°C, the diameter reduction ratio is 10/100, and the drawing speed is 20m/min;

Step 5. Put the obtained Al-Zn bimetallic composite material into an annealing furnace for post-drawing annealing treatment. The annealing temperature is 300° C. and the annealing time is 20 minutes, and then the finished product is taken up.

After testing, it was found that there were no defects such as oxidized slag inclusions, air suction, and thermal cracks in the bonding area. A metallurgical bond is formed between the two materials, and there is a continuous distribution of intermetallic compounds in the interface area, indicating that a metallurgical bond is formed between the two metals. After testing, the mechanical properties of the aluminum-zinc bimetallic composite material are good, and the shear strength is 34MPa.

Example 4

This embodiment relates to a method for preparing a bimetallic composite material by solid-liquid compounding and drawing combination of solid aluminum, including the following steps:

Step 1. Perform hot-dip galvanizing surface treatment on the solid 6101 extruded aluminum alloy preset material to be connected, and the thickness of the zinc layer is 50 μm;

Step 2. Presetting the surface-treated solid 6101 extruded aluminum alloy at the required position in the mold cavity;

Step 3. Melt the Zn-0.08Pb zinc alloy in the resistance furnace and pour it into the mold cavity. Using the processing technology of squeeze casting, the pouring temperature is 540°C, and the squeeze casting pressure is 30MPa, so that the aluminum and zinc are formed metallurgical bonding;

Step 4. Perform annealing treatment on the obtained 6101-Zn-0.08Pb aluminum-zinc bimetallic drawing blank before drawing. The annealing temperature is 350° C., and the annealing time is 5 minutes. The drawing temperature is 200°C, the diameter reduction ratio is 90/100, and the drawing speed is 5m/min;

Step 5. Put the obtained Al-Zn bimetallic composite material into an annealing furnace for post-drawing annealing treatment. The annealing temperature is 100° C. and the annealing time is 20 minutes, and then the finished product is taken up.

After testing, it was found that there were no defects such as oxidized slag inclusions, air suction, and thermal cracks in the bonding area. A metallurgical bond is formed between the two materials, and there is a continuous distribution of intermetallic compounds in the interface area, indicating that a metallurgical bond is formed between the two metals. After testing, the mechanical properties of the aluminum-zinc bimetallic composite material are good, and the shear strength is 90MPa.

Example 5

This embodiment relates to a method for preparing a bimetallic composite material by solid-liquid compounding and drawing combination of solid aluminum, including the following steps:

Step 1. Perform thermal spraying zinc surface treatment on the solid 6101 aluminum alloy preset material to be connected, and the thickness of the zinc layer is 25 μm;

Step 2, presetting the surface-treated solid 6101 aluminum alloy at the required position in the mold cavity;

Step 3: Melt commercially pure aluminum in a resistance furnace and pour it into the mold cavity. Using the sand casting process, the pouring temperature is 700°C to form a metallurgical bond between aluminum and aluminum;

Step 4. Perform annealing treatment on the obtained 6101-pure aluminum-aluminum-aluminum bimetallic drawing blank before drawing. The annealing temperature is 200°C, and the annealing time is 20 minutes. The temperature is 500°C, the diameter reduction ratio is 1/100, and the drawing speed is 5m/min;

Step 5. Put the obtained aluminum-aluminum bimetallic composite material into an annealing furnace for post-drawing annealing treatment. The annealing temperature is 500° C. and the annealing time is 10 minutes, and then the finished product is taken up.

After the solid-liquid combination of 6101 aluminum alloy and pure aluminum, there are no defects such as oxidized slag, gas absorption, thermal cracking, etc. in the bonding area; there is no obvious interface between the two aluminum alloys, forming a metallurgical bond, and the use of the surface to protect the zinc layer is very good It solves the problem that the oxide film hinders the formation of metallurgical bonding. After testing, the mechanical properties of the aluminum-aluminum bimetal composite are good, and the shear strength is 36MPa.

Example 6

This embodiment relates to a method for preparing a bimetallic composite material by solid-liquid compounding and drawing combination of solid aluminum, including the following steps:

Step 1. Electrogalvanizing surface treatment is performed on the solid 6101 extruded aluminum alloy preset material to be connected, and the thickness of the zinc layer is 15 μm;

Step 2. Presetting the surface-treated solid 6101 extruded aluminum alloy at the required position in the mold cavity;

Step 3. Melt the A356 cast aluminum alloy in the resistance furnace and pour it into the mold cavity. Using the extrusion casting process, the pouring temperature is 720°C and the extrusion casting pressure is 120MPa to form a metallurgical bond between aluminum and aluminum. ;

Step 4: Perform annealing treatment on the obtained 6101-A356 aluminum-aluminum bimetallic drawing blank before drawing, the annealing temperature is 100°C, the annealing time is 50min, and then continue the drawing process, the process is direct drawing, and the drawing temperature is 300°C, the diameter reduction ratio is 40/100, and the drawing speed is 50m/min;

Step 5. Put the obtained aluminum-aluminum bimetallic composite material into an annealing furnace for post-drawing annealing treatment. The annealing temperature is 150° C. and the annealing time is 20 minutes, and then the finished product is taken up.

After the solid-liquid combination of 6101 aluminum alloy and A356 aluminum alloy, there are no defects such as oxidized slag, gas absorption, thermal cracking, etc. in the bonding area; there is no obvious interface between the two aluminum alloys, forming a metallurgical bond, A356 dendrites directly from 6101 The growth begins on the substrate; the use of the surface protection zinc layer solves the problem that the oxide film hinders the formation of metallurgical bonding. After testing, the mechanical properties of the aluminum-aluminum bimetal composite are good, and the shear strength is 86MPa.

Comparative example 1

This embodiment relates to a method for preparing a bimetallic composite material by solid-liquid compounding and drawing combination of solid aluminum material. The technical solution is the same as that of embodiment 1, except that the thickness of the galvanized layer is 70 μm.

After testing, it was found that defects such as oxidized slag inclusions and pores appeared in the bonding area. No metallurgical bond can be formed between the two materials, no continuous and uniform intermetallic compound is formed in the interface area, and zinc elements gather at the interface, and obvious cracks appear on the interface. After testing, the mechanical properties of aluminum-magnesium bimetallic composites are poor, and the shear strength is 6MPa.

Comparative example 2

This embodiment relates to a method for preparing a bimetallic composite material by combining solid-liquid composite and drawing of a solid aluminum material. The technical solution is the same as that of Embodiment 1, except that the drawing process is not performed after solid-liquid composite casting.

After testing, it was found that there were no defects such as oxidized slag inclusions, air suction, and thermal cracks in the bonding area. A metallurgical bond is formed between the two materials, and intermetallic compounds are continuously distributed in the interface area, indicating that a metallurgical bond is formed between the two metals, but a hard and thick intermediate compound is formed between the two metals, which seriously affects the connection performance. After testing, the mechanical properties of aluminum-magnesium bimetallic composites are poor, and the shear strength is 12MPa.

Comparative example 3

This embodiment relates to a method for preparing a bimetallic composite material through solid-liquid compounding and drawing combination of solid aluminum materials. Material and magnesium material, mechanically spliced together for drawing process.

After testing, it was found that there were no defects such as slag inclusions, air suction, and thermal cracks in the bonding area. A metallurgical bond is formed between the two materials, and there is an intermetallic compound in the interface area, indicating that a metallurgical bond is formed between the two metals, but the intermetallic compound is not continuous, and there is an oxide scale between the two metals, which is precisely due to the presence of the oxide scale The formation of a continuous intermetallic compound between the two metals is affected, resulting in poorer connection performance and conductivity than in Example 1. After testing, the mechanical properties of aluminum-magnesium bimetallic composites are poor, and the shear strength is 5MPa.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims (10)

1. the method for double metallic composite material is prepared in solid-state aluminium solid-liquid compound and drawing combination, it is characterized in that, described method comprises the step that solid-liquid composite casting prepares Slug preparing double metallic composite material described in the step of bimetallic drawing blank, drawing.

2. the method for double metallic composite material is prepared in solid-state aluminium solid-liquid compound according to claim 1 and drawing combination, and it is characterized in that, the step that solid-liquid composite casting prepares bimetallic drawing blank specifically comprises:

Process preset: surface treatment is carried out to the preset material of solid aluminum to be connected, is preset in mold cavity after process;

Casting combines: be poured in described mold cavity by material to be cast for liquid state, and casting forms bimetallic drawing blank.

3. the method for double metallic composite material is prepared in solid-state aluminium solid-liquid compound according to claim 2 and drawing combination, and it is characterized in that, described preset solid aluminum material comprises fine aluminium, Birmasil, wrought aluminium alloy; Described mould material is the metal or alloy of fusing point less than or equal to solid aluminum material.

4. the method for double metallic composite material is prepared in solid-state aluminium solid-liquid compound according to claim 2 and drawing combination, and it is characterized in that, process in preset step, described surface treatment specifically refers to zinc-plated protective layer.

5. the method for double metallic composite material is prepared in solid-state aluminium solid-liquid compound according to claim 2 and drawing combination, it is characterized in that, in the step that casting combines, the method for described casting comprises sand casting, permanent mold casting, low pressure casting, high-pressure casting, vacuum pressing and casting, extrusion casint or centrifugal casting; Described pouring temperature is 450 ~ 800 DEG C.

6. the method for double metallic composite material is prepared in solid-state aluminium solid-liquid compound according to claim 1 and drawing combination, it is characterized in that, in the step of Slug preparing double metallic composite material described in drawing, the mode of described drawing comprise directly pull out, directly pull out continuously, coil pull out, one or several combination in spinning, tube rolling processing method;

The temperature of drawing is below-100 ~ mould material fusing point 100 DEG C;

The undergauge ratio of drawing is 1/100 ~ 90/100;

The undergauge speed of drawing is 10 ~ 400m/min.

7. the method for double metallic composite material is prepared in the solid-state aluminium solid-liquid compound according to claim 1 or 6 and drawing combination, it is characterized in that, the step of Slug preparing double metallic composite material described in drawing also comprises carries out the process of drawing after annealing, take-up to gained double metallic composite material.

8. the method for double metallic composite material is prepared in solid-state aluminium solid-liquid compound according to claim 7 and drawing combination, and it is characterized in that, the temperature of described annealing in process is below 100 ~ mould material fusing point 100 DEG C, and the time of annealing in process is 5 ~ 300min.

9. the method for double metallic composite material is prepared in the solid-state aluminium solid-liquid compound according to claim 1 or 6 and drawing combination, it is characterized in that, the step of Slug preparing double metallic composite material described in drawing also comprises carries out annealing in process before drawing to gained bimetallic drawing blank.

10. the method for double metallic composite material is prepared in solid-state aluminium solid-liquid compound according to claim 9 and drawing combination, and it is characterized in that, the temperature of described annealing in process is below 100 ~ mould material fusing point 100 DEG C, and the time of annealing in process is 0 ~ 300min.