Magnesium rolled plate with layered heterogeneous structure and preparation method of magnesium rolled plate

Abstract

The invention provides a magnesium rolled plate with a layered heterogeneous structure and a preparation method of the magnesium rolled plate, and belongs to the technical field of magnesium alloy material processing. The preparation method comprises the following steps: providing a first magnesium plate; heating the first magnesium plate to form a second magnesium plate; treating the oxide layers on the surfaces of the first magnesium plate and the second magnesium plate; alternately overlapping the first magnesium plate and the second magnesium plate to form a composite plate; the two ends of the composite board are fixed respectively; and the fixed composite board is preheated and then rolled. The preparation method has the effects of improving the preparation efficiency of the lamellar isomeric magnesium rolled plate and reducing the preparation cost of the lamellar isomeric magnesium rolled plate.

Description

Technical Field

[0001] The present disclosure relates to the technical field of magnesium alloy material processing, and in particular to a magnesium rolled plate with a layered heterogeneous structure and a preparation method thereof. Background Art

[0002] Magnesium alloys are widely used in many fields such as electronic products, automotive industry, aerospace, etc. due to their excellent properties such as light weight, high specific strength, large elastic modulus, good damping resistance and electromagnetic shielding. In order to improve the mechanical properties of magnesium alloys, plastic deformation is often used to improve the alloy structure. Rolling is one of the main methods for producing magnesium alloy sheets at present, which can refine the magnesium alloy structure and significantly improve its mechanical properties. However, rolling often forms a strong texture, reduces the elongation of the sheet and produces high anisotropy, resulting in poor strength-plasticity matching. The introduction of heterogeneous structure has become one of the solutions to this problem. Heterogeneous structure will produce a significant mutation-induced strengthening effect, which can improve the material's work hardening ability and show excellent strength and plasticity combination.

[0003] In the related art, the invention patent with patent number CN114653775A discloses "a layered heterogeneous magnesium alloy plate with coordinated strength and plasticity and a preparation method". The principle is to first subject two magnesium alloy ingots to a solid solution treatment, then extrude them into plates, and finally stack and extrude them multiple times. Although this method can obtain extruded layered heterogeneous magnesium alloy plates, it requires multiple extrusion processes, which is cumbersome to operate, has low production efficiency, and the size of the plates is easily limited. In addition, the invention patent with patent number CN114749505A discloses "a preparation system and method for laminated heterogeneous alloy plates". The principle is to place two alloy plates vertically through a special T-shaped extrusion die device for multiple extrusions and then roll them. This method is limited by the special extrusion die, and the operation is also cumbersome, with low production efficiency, and it is difficult to apply to thin plates with larger widths or smaller thicknesses, and is not suitable for industrial production.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The purpose of the present disclosure is to overcome the shortcomings of the above-mentioned prior art and provide a magnesium rolled sheet with a layered heterogeneous structure and a preparation method thereof, so as to reduce the preparation cost and preparation procedure of the magnesium rolled sheet, improve the preparation efficiency of the layered heterogeneous magnesium rolled sheet, and the preparation method has a simple process, is easy to operate and is easy to promote and apply.

[0006] According to a first aspect of the present disclosure, there is provided a method for preparing a magnesium rolled sheet having a layered heterogeneous structure, comprising:

[0007] Providing a first magnesium sheet;

[0008] heating the first magnesium plate to form a second magnesium plate;

[0009] Treating the oxide layers on the surfaces of the first magnesium plate and the second magnesium plate;

[0010] Alternately stacking the first magnesium sheet and the second magnesium sheet to form a composite sheet;

[0011] Fixing the two ends of the composite plate respectively;

[0012] The fixed composite plate is preheated and rolled.

[0013] According to an embodiment of the present disclosure, the material of the first magnesium plate is at least one of pure magnesium or a magnesium alloy.

[0014] According to an embodiment of the present disclosure, the thickness of the first magnesium plate is not greater than 4 mm.

[0015] According to an embodiment of the present disclosure, the difference in average grain size between the second magnesium plate and the first magnesium plate is between 10 and 50 microns.

[0016] According to an embodiment of the present disclosure, when the first magnesium plate is subjected to heat treatment to form the second magnesium plate, the temperature of the heating treatment is between 350 and 500° C., and the time of the heating treatment is between 7 and 20 hours.

[0017] According to an embodiment of the present disclosure, when fixing the two ends of the composite sheet respectively, one end of the composite sheet is drilled, and a rivet is inserted into the drilled hole to rivet one end of the composite sheet; the other end of the composite sheet is detachably fixed.

[0018] According to an embodiment of the present disclosure, when fixing both ends of the composite board and drilling one end of the composite board, the drilling position is located in the middle of the composite board along the width direction.

[0019] According to an embodiment of the present disclosure, when the fixed composite sheet is preheated and rolled, the preheating time of the composite sheet is between 15 and 30 minutes, and the rolling temperature of the composite sheet is between 350 and 450°C.

[0020] According to an embodiment of the present disclosure, when the fixed composite sheet is preheated and rolled, the rolling rate of the composite sheet in a single rolling pass is between 30% and 60%, and the rolling speed of the composite sheet is between 10 and 20 m / min.

[0021] According to another aspect of the present disclosure, a magnesium rolled plate having a layered heterogeneous structure is provided, which is prepared by the method for preparing a magnesium rolled plate having a layered heterogeneous structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0023] Figure 1 The present invention is a schematic diagram of a preparation process of a method for preparing a magnesium rolled plate having a layered heterogeneous structure in one embodiment of the present invention.

[0024] Figure 2 This is the microstructure diagram of the first magnesium plate.

[0025] Figure 3 This is the microstructure diagram of the second magnesium plate in Example 1.

[0026] Figure 4 This is the microstructure diagram of the second magnesium plate in Example 2.

[0027] Figure 5 Schematic diagram of the microstructure of the composite plate after rolling. DETAILED DESCRIPTION

[0028] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0029] In the related art, there are generally the following preparation methods: First, the two magnesium alloy ingots are first subjected to a solid solution treatment, then extruded into plates, and finally stacked and extruded multiple times. Although this preparation method can obtain extruded layered heterogeneous magnesium alloy plates, it requires multiple extrusion processes, the operation is cumbersome, the production efficiency is low, and the plate size is easily limited. Second, the two alloy plates are placed vertically through a special T-shaped extrusion die device for multiple extrusions and then rolled. This method is limited by the special extrusion die, the operation is also cumbersome, the production efficiency is low, and it is difficult to apply to thin plates with larger widths or smaller thicknesses, and it is not suitable for industrial production.

[0030] Based on this, the present disclosure provides a method for preparing a magnesium rolled sheet having a layered heterogeneous structure. Figure 1 , the preparation method includes steps S1 to S6.

[0031] Step S1: providing a first magnesium plate.

[0032] Step S2: heating the first magnesium plate to form a second magnesium plate.

[0033] Step S3: treating the oxide layers on the surfaces of the first magnesium plate and the second magnesium plate.

[0034] Step S4: alternately stacking the first magnesium plate and the second magnesium plate to form a composite plate.

[0035] Step S5: fix the two ends of the composite plate respectively.

[0036] Step S6: preheating and rolling the fixed composite plate.

[0037] The preparation method of magnesium rolled sheet with layered heterogeneous structure provided by the present disclosure can make the grain of the first magnesium sheet grow to form a second magnesium sheet by heating the first magnesium sheet; then remove the oxide layer on the surface of the first magnesium sheet and the second magnesium sheet, and alternately overlap the first magnesium sheet with the oxide layer removed and the second magnesium sheet to form a composite sheet; then fix the two ends of the composite sheet respectively, and then preheat the fixed composite sheet and perform rolling treatment to form a magnesium rolled sheet with layered heterogeneous structure. The preparation method has a relatively simple operation process and is easy to operate. It can not only improve the preparation efficiency of magnesium rolled sheet, but also reduce the preparation cost of magnesium rolled sheet. At the same time, the preparation method is easy to promote and apply, and is suitable for industrial production of magnesium rolled sheet with layered heterogeneous structure (for example, it can be suitable for wide-width plates and thin plates with small thickness).

[0038] The preparation method of the magnesium alloy sheet provided by the present disclosure will be described in detail below.

[0039] In some embodiments of the present disclosure, the material of the first magnesium plate is at least one of pure magnesium or a magnesium alloy. For example, the material of the first magnesium plate is pure magnesium or a magnesium alloy. It should be noted that in other embodiments of the present disclosure, the material of the first magnesium plate may not be limited thereto.

[0040] Of course, as an example, the material of the first magnesium plate may also be a composite of pure magnesium or a magnesium alloy, which is not limited in the embodiments of the present disclosure.

[0041] In some embodiments of the present disclosure, the thickness of the first magnesium plate is not greater than 4 mm. For example, the thickness of the first magnesium plate is 4 mm, 3 mm, 2 mm, or 1 mm.

[0042] In some embodiments of the present disclosure, the difference between the average grain size of the second magnesium plate and the first magnesium plate is between 10 and 50 microns. For example, the difference between the average grain size of the second magnesium plate and the first magnesium plate is 10 microns, 30 microns, 40 microns or 50 microns. It should be noted that in other embodiments, the difference between the average grain size of the second magnesium plate and the first magnesium plate is not limited to this.

[0043] In some embodiments of the present disclosure, when the first magnesium sheet is heated to form the second magnesium sheet, the temperature of the first magnesium sheet is between 350° C. and 500° C. For example, the temperature of the first magnesium sheet is 350° C., 400° C., 450° C. or 500° C. It should be noted that in other embodiments of the present disclosure, the temperature of the first magnesium sheet is not limited thereto.

[0044] In some embodiments of the present disclosure, when the first magnesium sheet is subjected to heat treatment to form the second magnesium sheet, the first magnesium sheet is subjected to heat treatment for a period of 7 to 20 hours. For example, the treatment time of the first magnesium sheet is 7 hours, 12 hours, 17 hours or 20 hours. It should be noted that in other embodiments of the present disclosure, the treatment time of the first magnesium sheet is not limited thereto.

[0045] As an example, when the first magnesium plate is subjected to heat treatment to form the second magnesium plate, the temperature of the heat treatment is between 350° C. and 500° C., and the time of the heat treatment is between 7 and 20 hours.

[0046] In some embodiments of the present disclosure, when fixing both ends of the composite sheet respectively, one end of the composite sheet is drilled, and a rivet is inserted into the drilled hole to rivet and fix one end of the composite sheet.

[0047] Here, it should be noted that in some other embodiments of the present disclosure, drilling can also be performed on the same end of the first magnesium plate and the second magnesium plate, and then the first magnesium plate and the second magnesium plate are alternately overlapped to form a composite plate with a drilled hole at one end. In this way, it is necessary to ensure that the drilled hole at one end of the first magnesium plate and the drilled hole at one end of the second magnesium plate are concentrically arranged, so that the first magnesium plate and the second magnesium plate can be better fixed, thereby improving the preparation quality of the magnesium rolled plate.

[0048] In some embodiments of the present disclosure, when the two ends of the composite board are fixed respectively, the other end of the composite board is detachably fixed. It should be noted that the other end of the composite board mentioned here refers to the end opposite to the end of the composite board with a hole.

[0049] In some embodiments of the present disclosure, the other end of the composite sheet can be detachably fixed by binding with metal wires. For example, the metal wires can be copper wires, aluminum wires, or silver wires. It should be noted that in other embodiments of the present disclosure, the metal wires are not limited to this, and any metal wire that can achieve detachable fixation of the other end of the composite sheet can be used, and the embodiments of the present disclosure will not be elaborated on this.

[0050] As an example, when fixing both ends of the composite plate respectively, one end of the composite plate is drilled, and a rivet is inserted into the drilled hole to rivet one end of the composite plate; the other end of the composite plate is detachably fixed.

[0051] In some embodiments of the present disclosure, when fixing both ends of the composite board and drilling one end of the composite board, the drilling position is located in the middle of the composite board along the width direction.

[0052] In the embodiment of the present disclosure, by setting the drilling position in the middle of one end of the composite plate, only one drilling hole is needed to achieve the fixation between the multiple first magnesium plates and the multiple second magnesium plates, which helps to reduce the preparation process of the magnesium rolled plate (compared to drilling holes in the remaining parts) and improve the preparation efficiency of the magnesium rolled plate.

[0053] In some embodiments of the present disclosure, when the fixed composite sheet is preheated and rolled, the preheating time of the composite sheet is between 15 and 30 minutes. For example, the preheating time of the composite sheet is 15 minutes, 20 minutes, 25 minutes or 30 minutes. It should be noted that in other embodiments of the present disclosure, the preheating time of the composite sheet is not limited to this.

[0054] In some embodiments of the present disclosure, when the fixed composite sheet is preheated and rolled, the rolling temperature of the composite sheet is between 350 and 450° C. For example, the rolling temperature of the composite sheet is 350° C., 380° C., 410° C. or 450° C. It should be noted that in other embodiments of the present disclosure, the rolling temperature of the composite sheet is not limited thereto.

[0055] As an example, when the fixed composite plate is preheated and rolled, the preheating time of the composite plate is between 15 and 30 minutes, and the rolling temperature of the composite plate is between 350 and 450°C.

[0056] In some embodiments of the present disclosure, when the fixed composite sheet is preheated and rolled, the rolling reduction rate of the composite sheet in a single rolling pass is between 30% and 60%. For example, the rolling reduction rate of the composite sheet in a single rolling pass is 30%, 40%, 50% or 60%. It should be noted that in other embodiments of the present disclosure, the rolling reduction rate of the composite sheet in a single rolling pass is not limited to this.

[0057] In some embodiments of the present disclosure, when the fixed composite sheet is preheated and rolled, the rolling speed of the composite sheet is between 10 and 20 m / min. For example, the rolling speed of the composite sheet is 10 m / min, 13 m / min, 16 m / min or 20 m / min. It should be noted that in other embodiments of the present disclosure, the rolling speed of the composite sheet is not limited thereto.

[0058] As an example, when the fixed composite plate is preheated and rolled, the rolling rate of the composite plate in a single rolling pass is between 30% and 60%, and the rolling speed of the composite plate is between 10 and 20 m / min.

[0059] In the embodiment of the present disclosure, a magnesium rolled plate with a layered heterogeneous structure is also provided, and the magnesium rolled plate is prepared by the above-mentioned preparation method. The magnesium rolled plate can further control the width of the heterogeneous layer structure by changing the number, thickness and rolling times of the composite riveting of the first magnesium plate and the second magnesium plate with different grain sizes, and obtain a microstructure with different interlayer spacing of the heterogeneous layer structure.

[0060] The method for preparing the magnesium rolled plate with layered heterogeneous structure provided by the embodiment of the present disclosure is further described below in combination with different embodiments and corresponding drawings.

[0061] Embodiment 1:

[0062] The layered heterogeneous magnesium rolled plate of Example 1 is prepared by the following steps 1 to 6.

[0063] Step 1: providing a first magnesium plate.

[0064] Specifically, a plurality of first magnesium plates with a thickness of 1 mm are provided. In this step, the model of the magnesium plates is AZ31. Figure 2 This is the microstructure diagram of the first magnesium plate. Figure 2 , the average grain size of the first magnesium sheet is about 9.4 microns.

[0065] Step 2: heat the first magnesium plate to form a second magnesium plate.

[0066] Specifically, when the first magnesium plate is subjected to heat treatment to form the second magnesium plate, the first magnesium plate is heated at 430° C. for 9 hours. Figure 3 This is the microstructure diagram of the second magnesium plate in Example 1. Figure 3 , the average grain size of the second magnesium sheet is about 22.6 μm.

[0067] Step 3: Treating the oxide layers on the surfaces of the first magnesium plate and the second magnesium plate.

[0068] Specifically, the oxide layers on the surfaces of the first magnesium plate and the second magnesium plate are polished and removed. By removing the oxide layers on the surfaces of the first magnesium plate and the second magnesium plate, the bonding effect between the first magnesium plate and the second magnesium plate can be improved, thereby improving the preparation quality of the magnesium rolled plate.

[0069] Step 4: Alternately stack the first magnesium plate and the second magnesium plate to form a composite plate.

[0070] Specifically, a plurality of first magnesium plates and second magnesium plates are alternately stacked to form a composite plate.

[0071] As an example, the first magnesium sheet and the second magnesium sheet are alternately stacked in five layers.

[0072] In one example, the first magnesium plate can be set at the bottom layer, so that the composite plate includes the first magnesium plate, the second magnesium plate, the first magnesium plate, the second magnesium plate and the first magnesium plate stacked in sequence. At this time, the first magnesium plate is set in three layers and the second magnesium plate is set in two layers.

[0073] In another example, the second magnesium plate can be set at the bottom layer, so that the composite plate includes a second magnesium plate, a first magnesium plate, a second magnesium plate, a first magnesium plate and a second magnesium plate stacked in sequence. At this time, the second magnesium plate is set in three layers and the first magnesium plate is set in two layers.

[0074] In some embodiments, after step three, drilling can be performed in the middle of one end of the first magnesium plate and the second magnesium plate (the same end as the first magnesium plate and the second magnesium plate), and then the first magnesium plate and the second magnesium plate after drilling are alternately stacked to form a composite plate (when the first magnesium plate and the second magnesium plate are alternately stacked, it is necessary to ensure that the drilled hole of the first magnesium plate is concentric with the drilled hole of the second magnesium plate).

[0075] In other embodiments, in step 4, a uniform drilling process may be performed on one end of a composite plate formed by alternately stacking the first magnesium plate and the second magnesium plate.

[0076] Meanwhile, in step 4, the thickness of the composite board is 5 mm.

[0077] Step 5: Fix both ends of the composite board.

[0078] Specifically, a rivet is inserted into one end of the composite plate having a drilled hole, and the plurality of first magnesium plates and the second magnesium plates are fixed by the rivet. The other end of the composite plate is bound and fixed with a thin iron wire.

[0079] Step 6: Preheat the fixed composite sheet and then roll it.

[0080] Specifically, the fixed composite plate is preheated at 400°C for 30 minutes. When the preheated composite plate is rolled, the rolling speed is 10m / min, the single-pass rolling reduction rate of the composite plate is 41.4%, and the composite plate is rolled to a thickness of 2.93 mm to obtain a magnesium rolled plate with a layered heterogeneous structure. Figure 5 Schematic diagram of the microstructure of the composite plate after rolling, see Figure 5 .

[0081] Embodiment 2:

[0082] The layered heterogeneous magnesium rolled plate of Example 2 is prepared by the following steps 1 to 6.

[0083] Step 1: providing a first magnesium plate.

[0084] Specifically, a plurality of first magnesium plates with a thickness of 1 mm are provided. In this step, the model of the magnesium plates is AZ31. Figure 2 This is the microstructure diagram of the first magnesium plate. Figure 2 , the average grain size of the first magnesium sheet is about 9.4 microns.

[0085] Step 2: heat the first magnesium plate to form a second magnesium plate.

[0086] Specifically, when the first magnesium plate is subjected to heat treatment to form the second magnesium plate, the first magnesium plate is heated at 450° C. for 7 hours. Figure 4 This is the microstructure diagram of the second magnesium plate in Example 2, see Figure 4 , the average grain size of the second magnesium sheet is about 21.1 μm.

[0087] Step 3: Treating the oxide layers on the surfaces of the first magnesium plate and the second magnesium plate.

[0088] Specifically, the oxide layers on the surfaces of the first magnesium plate and the second magnesium plate are polished and removed. By removing the oxide layers on the surfaces of the first magnesium plate and the second magnesium plate, the bonding effect between the first magnesium plate and the second magnesium plate can be improved, thereby improving the preparation quality of the magnesium rolled plate.

[0089] Step 4: Alternately stack the first magnesium plate and the second magnesium plate to form a composite plate.

[0090] Specifically, a plurality of first magnesium plates and second magnesium plates are alternately stacked to form a composite plate.

[0091] As an example, the first magnesium sheet and the second magnesium sheet are alternately stacked in five layers.

[0092] In one example, the first magnesium plate can be set at the bottom layer, so that the composite plate includes the first magnesium plate, the second magnesium plate, the first magnesium plate, the second magnesium plate and the first magnesium plate stacked in sequence. At this time, the first magnesium plate is set in three layers and the second magnesium plate is set in two layers.

[0093] In another example, the second magnesium plate can be set at the bottom layer, so that the composite plate includes a second magnesium plate, a first magnesium plate, a second magnesium plate, a first magnesium plate and a second magnesium plate stacked in sequence. At this time, the second magnesium plate is set in three layers and the first magnesium plate is set in two layers.

[0094] In some embodiments, after step three, drilling can be performed in the middle of one end of the first magnesium plate and the second magnesium plate (the same end as the first magnesium plate and the second magnesium plate), and then the first magnesium plate and the second magnesium plate after drilling are alternately stacked to form a composite plate (when the first magnesium plate and the second magnesium plate are alternately stacked, it is necessary to ensure that the drilled hole of the first magnesium plate is concentric with the drilled hole of the second magnesium plate).

[0095] In other implementations, in step 4, one end of the composite plate formed by alternately stacking the first magnesium plate and the second magnesium plate may be uniformly drilled.

[0096] In step 4, the thickness of the composite board is 5 mm.

[0097] Step 5: Fix both ends of the composite board.

[0098] Specifically, a rivet is inserted into one end of the composite plate having a drilled hole, and the plurality of first magnesium plates and the second magnesium plates are fixed by the rivet. The other end of the composite plate is bound and fixed with a thin iron wire.

[0099] Step 6: Preheat the fixed composite sheet and then roll it.

[0100] Specifically, the fixed composite plate is preheated at 400°C for 20 minutes. When the preheated composite plate is rolled, the rolling speed is 10m / min, the single-pass rolling reduction rate of the composite plate is 45%, and the composite plate is rolled to a thickness of 2.75 mm to obtain a magnesium rolled plate with a layered heterogeneous structure. Figure 5Schematic diagram of the microstructure of the composite plate after rolling, see Figure 5 .

[0101] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A method for preparing a magnesium rolled sheet having a layered heterogeneous structure, characterized in that: include: Providing a first magnesium sheet; heating the first magnesium plate to form a second magnesium plate; Treating the oxide layers on the surfaces of the first magnesium plate and the second magnesium plate; Alternately stacking the first magnesium sheet and the second magnesium sheet to form a composite sheet; Fixing the two ends of the composite plate respectively; The fixed composite plate is preheated and rolled.

2. The method for preparing a magnesium rolled sheet having a layered heterogeneous structure according to claim 1, characterized in that: The material of the first magnesium plate is at least one of pure magnesium or magnesium alloy.

3. The method for preparing a magnesium rolled sheet having a layered heterogeneous structure according to claim 1, characterized in that: The thickness of the first magnesium plate is not greater than 4 mm.

4. The method for preparing a magnesium rolled sheet having a layered heterogeneous structure according to claim 1, characterized in that: The difference in average grain size between the second magnesium plate and the first magnesium plate is between 10 and 50 microns.

5. The method for preparing a magnesium rolled sheet having a layered heterogeneous structure according to claim 1, characterized in that: When the first magnesium plate is subjected to a heating treatment to form a second magnesium plate, the heating treatment temperature is between 350 and 500° C., and the heating treatment time is between 7 and 20 hours.

6. The method for preparing a magnesium rolled sheet having a layered heterogeneous structure according to claim 1, characterized in that: When fixing the two ends of the composite plate respectively, one end of the composite plate is drilled, and a rivet is inserted into the drilled hole to rivet one end of the composite plate; the other end of the composite plate is detachably fixed.

7. The method for preparing a magnesium rolled sheet having a layered heterogeneous structure according to claim 6, characterized in that: When fixing both ends of the composite board and drilling one end of the composite board, the drilling position is located in the middle of the composite board along the width direction.

8. The method for preparing a magnesium rolled sheet having a layered heterogeneous structure according to claim 1, characterized in that: When the fixed composite plate is preheated and rolled, the preheating time of the composite plate is between 15 and 30 minutes, and the rolling temperature of the composite plate is between 350 and 450°C.

9. The method for preparing a magnesium rolled sheet having a layered heterogeneous structure according to claim 1, characterized in that: When the fixed composite plate is preheated and rolled, the rolling rate of the composite plate in a single rolling pass is between 30% and 60%, and the rolling speed of the composite plate is between 10 and 20 m / min.

10. A magnesium rolled sheet having a layered heterogeneous structure, characterized in that: The magnesium rolled sheet is prepared by the method for preparing a magnesium rolled sheet with a layered heterogeneous structure according to any one of claims 1 to 9.

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