CN118385274A - Cold rolling method of magnesium-aluminum composite sheet - Google Patents

Abstract

The invention discloses a cold rolling method for a magnesium-aluminum composite plate, which is specifically implemented according to the following steps: step 1, heat-treating a ZK60 magnesium alloy plate and a 1050 aluminum plate respectively; step 2, degreasing the heat-treated ZK60 magnesium alloy plate and the 1050 aluminum plate with acetone to remove pollutants; step 3, polishing the acetone-treated ZK60 magnesium alloy plate and the 1050 aluminum plate; step 4, stacking the polished 1050 aluminum plate and the ZK60 magnesium alloy plate in order from bottom to top or from bottom to top, and fixing their respective entrance ends and both sides; step 5, placing the stacked and fixed 1050 aluminum plate and the ZK60 magnesium alloy plate in a rolling device for room temperature rolling, cutting the plate after room temperature rolling from the middle, then stacking them up, and putting them in room temperature rolling again, and repeating six times. The invention solves the problem that the existing process for preparing magnesium-aluminum alloy has high environmental requirements and complex process requirements.

Description

Cold rolling method of magnesium-aluminum composite sheet

Technical Field

The invention belongs to the technical field of composite material preparation, and in particular relates to a cold rolling method for a magnesium-aluminum composite plate.

Background technique

Magnesium alloys have low plastic forming ability, insufficient rigidity, poor corrosion resistance, and low absolute strength, which greatly limit their large-scale application. Aluminum alloys are currently the most widely used non-ferrous metal structural materials in industrial production, with the characteristics of low density, good formability, high strength, and excellent corrosion resistance. Magnesium-aluminum composite materials combine the advantages of both magnesium alloys and aluminum alloys, and can obtain better comprehensive performance than a single material. They have broad application prospects in aerospace, automobiles, transportation and other fields, and have become a research hotspot in the field of light metals at home and abroad.

With the development of aerospace technology and the increasing advantages of lightweight alloys in the field of lightweight automobile applications, aluminum-copper-magnesium layered composite materials have been widely used. The promotion of aluminum-copper-magnesium metal laminates is of great significance to solving the current energy structure and lightweight problems. With the growing demand for aluminum-copper-magnesium layered composite sheets in the market, the preparation technology of aluminum-copper-magnesium composite sheets has also made great progress. Aluminum-copper-magnesium layered composite sheets combine the characteristics of low density, high specific strength, and strong surface corrosion resistance, and have physical and chemical properties that single metals do not have.

From the current research status, the use of spray deposition, reverse solidification, brazing composite and other technical routes has high environmental requirements and complex processes, and cannot guarantee uniform and good metallurgical bonding between materials. Although the interface bonding strength of the layered composite material prepared by powder metallurgy is higher than that of the cast state, its matrix strength and heat resistance are relatively weak, and the process environment requirements are high and difficult to meet. The rolling temperature of traditional magnesium alloys is usually above 300°C. Due to the large difference in plastic deformation capacity between magnesium alloys and aluminum alloys, magnesium alloys and aluminum alloys achieve good metallurgical bonding at the interface, and the rolling temperature is usually above 350°C.

Summary of the invention

The purpose of the present invention is to provide a cold rolling method for a magnesium-aluminum composite plate, so as to solve the problems of high environmental requirements and complex process requirements in the existing process for preparing magnesium-aluminum alloys.

In order to achieve the above object, the technical solution adopted by the present invention is: a cold rolling method of a magnesium-aluminum composite plate, which is specifically implemented according to the following steps:

Step 1, heat treating the ZK60 magnesium alloy plate and the 1050 aluminum plate respectively;

Step 2, degreasing the heat-treated ZK60 magnesium alloy plate and 1050 aluminum plate with acetone to remove contaminants;

Step 3, grinding the ZK60 magnesium alloy plate and the 1050 aluminum plate after acetone treatment;

Step 4, stacking the polished 1050 aluminum plate and the ZK60 magnesium alloy plate in order from bottom to top or from bottom to top, and fixing their respective inlet ends and both side edges;

Step 5, placing the stacked and fixed 1050 aluminum plates and ZK60 magnesium alloy plates into a rolling device for room temperature rolling, cutting the plates after room temperature rolling in the middle, then stacking them up, and placing them into room temperature rolling again, and repeating this for six times.

As a preferred technical solution of the present invention, in the step 1, the ZK60 magnesium alloy plate is kept at 380°C-420°C for 3h-5h to complete the heat treatment, wherein the heating rate is 2°C/min-4°C/min, and after the insulation is completed, it is cooled to room temperature with the furnace; the 1050 aluminum alloy plate is kept at 370°C-420°C for 1h-3h, then cooled to below 300°C at a rate of 30°C/min-50°C/min, and finally cooled by air.

As a preferred technical solution of the present invention, in step 1, the thickness of the 1050 aluminum plate is 0.5 mm, and the thickness of the ZK60 magnesium alloy is 1 mm.

As a preferred technical solution of the present invention, in step 5, the room temperature rolling is as follows: the pressing amount is 50% each time.

As a preferred technical solution of the present invention, in step 5, the total thickness of the 1050 aluminum plate and the ZK60 magnesium alloy plate stacked together is 1.5 mm, and during the room temperature rolling process, they are pressed down by 50%; in step 6, the stacking is cut open to maintain the thickness of the multi-layer plate after rolling at 0.75 mm.

The beneficial effects of the present invention are as follows: during the rolling process, the ZK60 magnesium alloy and the 1050 pure aluminum are subjected to a large deformation cumulative rolling process to generate an Mg17Al12 intermediate phase at the interface, thereby improving the bonding strength between the 1050 pure aluminum and the ZK60 magnesium alloy, and ensuring that the magnesium-aluminum layers of the two metals are tightly bonded and not stratified under the condition of a large amount of reduction. The finished product has a layer of aluminum alloy attached to the surface, which shows the unique surface treatment ability of the aluminum alloy (i.e., it is not easy to oxidize, and has a good surface treatment effect. At the same time, the density of the composite plate is controlled at. Heat treatment is used to make the material structure more uniform and reduce its strength, which can better regulate the plastic deformation ability of the metal, so that the materials are more tightly bonded after rolling. The rolling process adopted by the present invention is simple in preparation and has low requirements on the production environment. The obtained product is mechanically bonded, has high tensile strength and heat resistance, and this solution can be used for the production of plates with a thickness of 0.5-10 mm.

BRIEF DESCRIPTION OF THE DRAWINGS

1 to 6 are schematic diagrams showing the effects of the magnesium-aluminum composite plate after the first to sixth rolling passes;

FIG. 7 is a stress-strain diagram of the magnesium-aluminum composite plate after the first to sixth rolling passes.

Detailed ways

The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

The cold rolling method of the magnesium-aluminum composite plate of the present invention is specifically implemented according to the following steps:

Step 1, 0.5 mm 1050 aluminum alloy plate was kept at 370 ° C for 3 hours, then cooled to 300 ° C at a rate of 30 ° C / min, and finally cooled by air; 1 mm ZK60 magnesium alloy plate was kept at 380 ° C for 5 hours to complete the heat treatment, wherein the heating rate was 2 ° C / min, and after the insulation was completed, it was cooled to room temperature with the furnace;

Step 2, degreasing the heat-treated ZK60 magnesium alloy plate and 1050 aluminum plate with acetone to remove contaminants;

Step 3, grinding the ZK60 magnesium alloy plate and the 1050 aluminum plate after acetone treatment;

Step 4, stacking the polished 1050 aluminum plate and the ZK60 magnesium alloy plate in order from bottom to top or from bottom to top, and fixing their respective inlet ends and both side edges;

Step 5, placing the stacked and fixed 1050 aluminum plates and ZK60 magnesium alloy plates into a rolling equipment for room temperature rolling, the room temperature rolling is as follows: the first pass has a reduction of 50%; after intermediate shearing, stacking, placing the aluminum surface on the outer layer, and performing the second pass with a reduction of 50%; repeating the shearing again and stacking for the third pass with a reduction of 50%, and repeating the above for the fourth, fifth, and sixth passes.

From the observations in Figures 1 to 7, it can be seen that from the third pass, the ZK60 layer begins to shear and neck, and from the fourth pass, it begins to neck and break, and the mechanical composite properties are enhanced. From the fifth pass, Mg17Al12 phase is generated, which effectively improves the mechanical properties and elongation of the magnesium plate.

The performance test was carried out using 1050 aluminum plate, ZK60 magnesium alloy and the magnesium-aluminum composite plate obtained in Example 1 with the same thickness. The results are shown in Table 1:

Table 1

The cold rolling method of the magnesium-aluminum composite plate of the present invention adopts the rolling technology to roll the ZK60 magnesium alloy with high metal strength. The industrial 1050 pure aluminum has low strength and high plasticity, and is difficult to combine under room temperature cold rolling in the actual production process. Therefore, large deformation and multi-pass rolling are adopted to improve the bonding strength between the 1050 pure aluminum and the ZK60 magnesium alloy, and ensure that the magnesium-aluminum layers of the two metals are tightly bonded and not stratified under the condition of a large reduction amount. The finished product has a layer of aluminum alloy attached to the surface, which shows the unique surface treatment ability of the aluminum alloy (i.e., it is not easy to oxidize, and has a good surface treatment effect. At the same time, the density of the composite plate is controlled to be less than 3.0g/ ^cm3 . Heat treatment is adopted to make the material structure more uniform and reduce its strength, and the plastic deformation ability of the metal can be better regulated, so that the materials are more tightly bonded after rolling. The rolling process adopted by the present invention is simple in process and has low requirements on the production environment. The obtained product is mechanically bonded, has high tensile strength and heat resistance, and the technical solution of the present invention can be used for the production of plates with a thickness of 0.5-10mm.

Example 2

As shown in FIG1 , the cold rolling method of the magnesium-aluminum composite plate of the present invention is specifically implemented according to the following steps:

Step 1, 0.5 mm 1050 aluminum alloy plate is kept at 395 ° C for 2 hours, then cooled to below 280 ° C at a rate of 40 ° C/min, and finally cooled by air; 1 mm ZK60 magnesium alloy plate is kept at 400 ° C for 4 hours to complete heat treatment, wherein the heating rate is 3 ° C/min, and after the insulation is completed, it is cooled to room temperature with the furnace;

Step 2, degreasing the heat-treated ZK60 magnesium alloy plate and 1050 aluminum plate with acetone to remove contaminants;

Step 3, grinding the ZK60 magnesium alloy plate and the 1050 aluminum plate after acetone treatment;

Step 4, stacking the polished 1050 aluminum plate and the ZK60 magnesium alloy plate in order from bottom to top or from bottom to top, and fixing their respective inlet ends and both side edges;

Step 5, placing the stacked and fixed 1050 aluminum plates and ZK60 magnesium alloy plates into a rolling equipment for room temperature rolling, the room temperature rolling is as follows: the first pass has a reduction of 50%; after intermediate shearing, stacking, placing the aluminum surface on the outer layer, and performing the second pass with a reduction of 50%; repeating the shearing again and stacking for the third pass with a reduction of 50%, and repeating the above for the fourth, fifth, and sixth passes.

Example 3

As shown in FIG1 , the cold rolling method of the magnesium-aluminum composite plate of the present invention is specifically implemented according to the following steps:

Step 1, 0.5 mm 1050 aluminum alloy plate was kept at 420°C for 1 hour, then cooled to 250°C at a rate of 50°C/min, and finally air-cooled; 1 mm ZK60 magnesium alloy plate was kept at 420°C for 3 hours to complete the heat treatment, wherein the heating rate was 4°C/min, and after the insulation was completed, it was cooled to room temperature with the furnace;

Step 2, degreasing the heat-treated ZK60 magnesium alloy plate and 1050 aluminum plate with acetone to remove contaminants;

Step 3, grinding the ZK60 magnesium alloy plate and the 1050 aluminum plate after acetone treatment;

Step 4, stacking the polished 1050 aluminum plate and the ZK60 magnesium alloy plate in order from bottom to top or from bottom to top, and fixing their respective inlet ends and both side edges;

Step 5, placing the stacked and fixed 1050 aluminum plates and ZK60 magnesium alloy plates into a rolling equipment for room temperature rolling, the room temperature rolling is as follows: the first pass has a reduction of 50%; after intermediate shearing, stacking, placing the aluminum surface on the outer layer, and performing the second pass with a reduction of 50%; repeating the shearing again and stacking for the third pass with a reduction of 50%, and repeating the above for the fourth, fifth, and sixth passes.

Claims (5)

1. A method for cold rolling a magnesium-aluminum composite sheet, characterized in that it is implemented in the following steps: Step 1, heat treating the ZK60 magnesium alloy plate and the 1050 aluminum plate respectively; Step 2, degreasing the heat-treated ZK60 magnesium alloy plate and 1050 aluminum plate with acetone to remove contaminants; Step 3, grinding the ZK60 magnesium alloy plate and the 1050 aluminum plate after acetone treatment; Step 4, stacking the polished 1050 aluminum plate and the ZK60 magnesium alloy plate in order from bottom to top or from bottom to top, and fixing their respective inlet ends and both side edges; Step 5, placing the stacked and fixed 1050 aluminum plates and ZK60 magnesium alloy plates into a rolling device for room temperature rolling, cutting the plates after room temperature rolling in the middle, then stacking them up, and placing them into room temperature rolling again, and repeating this for six times. 2. The cold rolling method of the magnesium-aluminum composite plate according to claim 1 is characterized in that, in the step 1, the ZK60 magnesium alloy plate is kept at 380°C-420°C for 3h-5h to complete the heat treatment, wherein the heating rate is 2°C/min-4°C/min, and the plate is cooled to room temperature with the furnace after the insulation is completed; the 1050 aluminum alloy plate is kept at 370°C-420°C for 1h-3h, then cooled to below 300°C at a rate of 30°C/min-50°C/min, and finally cooled by air. 3. The cold rolling method of the magnesium-aluminum composite plate according to claim 2, characterized in that in the step 1, the thickness of the 1050 aluminum plate is 0.5 mm, and the thickness of the ZK60 magnesium alloy is 1 mm. 4. The cold rolling method of the magnesium-aluminum composite plate according to claim 3 is characterized in that, in the step 5, the room temperature rolling is: the pressing amount is 50% each time. 5. The cold rolling method of magnesium-aluminum composite plate according to claim 4 is characterized in that in said step 5, the total thickness of the 1050 aluminum plate and the ZK60 magnesium alloy plate stacked together is 1.5 mm, and during the rolling process at room temperature, the pressing amount each time is 50%; the stacking is cut apart to maintain the thickness of the multi-layer plate after rolling at 0.75 mm.