CN113352708B

CN113352708B - Light high-strength Mg-Ta composite metal plate and room-temperature rolling forming method thereof

Info

Publication number: CN113352708B
Application number: CN202110658436.XA
Authority: CN
Inventors: 韩修柱; 罗文博; 薛志勇; 孔钦可; 许焕宾
Original assignee: North China Electric Power University; Beijing Institute of Spacecraft System Engineering
Current assignee: North China Electric Power University; Beijing Institute of Spacecraft System Engineering
Priority date: 2021-07-06
Filing date: 2021-07-06
Publication date: 2022-02-22
Anticipated expiration: 2041-07-06
Also published as: CN113352708A

Abstract

The invention belongs to the technical field of metal material processing, particularly relates to a light high-strength Mg-Ta composite metal plate, and further discloses a room-temperature rolling preparation method thereof. According to the light high-strength Mg-Ta composite metal plate, the light metal rolled pure aluminum intermediate layer is added between the magnesium alloy plate and the tantalum metal plate, and the low-temperature annealing treatment and the high-temperature diffusion connection treatment between rolling passes are assisted, so that a high-strength interface with mechanical connection and metallurgical bonding is formed between magnesium and tantalum dissimilar metals, the light high-strength magnesium-tantalum composite metal plate is successfully prepared, a new thought is provided for room-temperature forming between a light structural material and a heavy metal material, and the light high-strength Mg-Ta composite metal plate has positive significance for improving the structural technical level of a deep space exploration spacecraft.

Description

Light high-strength Mg-Ta composite metal plate and room-temperature rolling forming method thereof

Technical Field

The invention belongs to the technical field of metal material processing, particularly relates to a light high-strength Mg-Ta composite metal plate, and further discloses a room-temperature rolling forming method thereof.

Background

With the development of aerospace technology in China, the traditional aerospace big country advances to the aerospace strong country, and deep space exploration is one of important supports for realizing aerospace transformation in China. The deep space exploration is to launch manned/unmanned spacecrafts from the earth to enter the space, and carry out scientific investigation and space utilization on remote extraterrestrial stars. Therefore, based on the technical level of the existing carrying and deep space spacecraft in China at present, the multifunctional loads cannot be successfully delivered to the preset orbit, so that the structure of the spacecraft must be lightened to a certain degree, and the selection of light materials is one of the main ways for lightening the structure of the spacecraft.

In addition, for the subsequent deep space exploration in China, certain special stars can capture particles with higher energy due to the very strong electromagnetic environment surrounding the special stars, and the high-energy particles are fatal to spacecraft equipment and can effectively damage the operation of the equipment to cause the task failure. Therefore, the deep space exploration of the star body in various countries takes the protection of high-energy particles as a key technology of structure design. Based on the structure, the existing foreign related detection adopts heavy metal with higher density to carry out corresponding structure preparation, and the influence of a strong magnetic field and high-energy particles on electronic equipment is shielded through strong tough reflection, scattering and the like of the heavy metal. For example, the shielding structure is prepared by titanium alloy in the United states and pure tantalum in Europe, the weight of the whole structure is not less than 180kg, and the emission requirement of the spacecraft structure prepared by heavy metal with high density cannot be met for the current carrying capacity of China. Therefore, research and development of a composite material of light alloy (Mg alloy) and heavy metal (pure Ta) alloy need to be innovatively developed, so that the material/structure can meet the requirement of high capability of space orbit shielding and the requirement of light structure, and the structure development of novel spacecrafts in China is assisted.

However, for two materials, namely light Mg alloy and pure Ta, due to the difference of essential attributes such as the difference of melting points of dissimilar metals (the melting point of tantalum is about 2995 ℃ and the melting point of magnesium is about 650 ℃), different lattice structures (the tantalum is BCC and magnesium HCP), the problems of interface deformation incompatibility, thermal-physical property mismatch and the like in the cumulative tandem rolling process, interface non-combination, insufficient tandem rolling deformation, premature cracking of plates and the like are easily caused. Moreover, the mutual solubility of the Mg and the Ta is very small (less than 0.1 wt%), and as shown in a Mg-Ta binary phase diagram shown in FIG. 1, no matter what proportion is adopted between the two elements of the Mg and the Ta below 650 ℃, the diffusion between the elements can not occur, so that a metallurgical bonding interface with a certain depth can not be formed by the pure Mg and the Ta, and the technical bottleneck of the room-temperature rolling forming of the Mg/Ta composite plate is caused. Therefore, the patent provides a novel room-temperature rolling method for a magnesium/tantalum composite plate added with a pure aluminum intermediate layer, and related reports are rarely reported at home and abroad in the research in the direction.

At present, in the aspect of rolling and forming of Mg/Ta in China, for example, in the preparation method of the heterogeneous shielding type magnesium-tantalum multilayer composite plate disclosed in Chinese patent CN112742870A, when the rolling and forming of Mg/Ta are carried out, a sheathing way is adopted to carry out hot rolling and forming of magnesium alloy and pure tantalum, although the formed Mg/Ta composite plate can be obtained, the service performance, particularly the strength performance, is not very ideal, and the hot rolling and forming process influences the engineering production efficiency of the composite plate.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to provide a light high-strength Mg-Ta composite metal plate formed by shrimp rolling at room temperature, wherein the plate is formed by additionally arranging a rolling intermediate layer, so that magnesium and tantalum metals are connected through a special intermediate layer light metal, and the plate has the advantages of light weight, high strength, mechanical and metallurgical bonding interface and the like;

the second technical problem to be solved by the invention is to provide the room temperature rolling forming method of the light-weight, high-strength and good interface bonding Mg-Ta composite metal plate.

In order to solve the technical problem, the room-temperature roll forming plate of the light high-strength Mg-Ta composite metal plate comprises a magnesium alloy plate layer, a pure aluminum intermediate layer, a pure tantalum plate layer, a pure aluminum intermediate layer and a magnesium alloy plate layer which are sequentially compounded, wherein a diffusion interface exists between the adjacent plate layers.

Specifically, in the light high-strength Mg-Ta composite metal plate:

the thickness of the pure aluminum intermediate layer is 0.05-0.15 mm;

the thickness of the magnesium alloy plate layer is 0.3-1.0 mm;

the thickness of the pure tantalum plate layer is 0.6-1.5 mm.

The invention also discloses a room temperature rolling forming method of the light high-strength Mg-Ta composite metal plate, which comprises the following steps:

(1) annealing the selected magnesium alloy plate and the pure tantalum plate; preprocessing the selected pure aluminum plate, the annealed magnesium alloy plate and the annealed pure tantalum plate for later use;

(2) stacking the magnesium alloy plate, the pure aluminum plate and the pure tantalum plate in sequence according to the structure of the composite metal plate, and performing cold rolling forming at room temperature to obtain a composite plate;

(3) carrying out vacuum low-temperature annealing treatment on the rolled composite board in a protective atmosphere;

(4) and (3) carrying out high-temperature diffusion heat treatment on the composite board subjected to the vacuum low-temperature annealing treatment to obtain the composite board.

Specifically, in the step (2), the control parameters of the room-temperature cold rolling forming step include: the speed range of the roller is controlled to be 50r/min-90r/min, and the rolling amount is controlled to be 40% -70%.

Specifically, in the step (3), in order to eliminate the residual stress generated due to the inconsistent deformation between the magnesium alloy and the tantalum alloy between the passes and improve the stability of the metal interface of the next pass, low-temperature annealing treatment needs to be performed between the two passes, wherein the low-temperature annealing treatment is to perform heat treatment on the plate at the temperature of 145-200 ℃, and the heat preservation time is 0.5-4 h.

Specifically, in the step (4), in order to improve the stability of the metal interface and promote metallurgical bonding of the interface, the high-temperature diffusion heat treatment step is to perform heat preservation treatment on the plate at the temperature of 400-470 ℃, the heat preservation time is 0.5-1.5 h, and the pressure maintaining pressure is 0.05-0.1 MPa.

Specifically, in the step (1), in order to eliminate the residual stress of the original magnesium alloy and the pure tantalum material, annealing treatment needs to be performed before rolling the composite plate. Preferably, the annealing temperature of the magnesium alloy plate is controlled to be 225-300 ℃, the heat preservation time is 1.5-3.5 h, and after the heat preservation time is finished, the magnesium alloy plate is quickly taken out and air-cooled to the room temperature; controlling the annealing temperature of the pure tantalum plate to be 1040-1480 ℃, keeping the temperature for 2.5-5.5 h, and after the heat preservation time is finished, rapidly taking out and air-cooling to the room temperature.

In the step (1), the pretreatment step includes the steps of polishing and cleaning the pure tantalum plate and the annealed magnesium alloy plate, and the step of cleaning the pure aluminum plate.

Specifically, in order to increase the contact area between the magnesium alloy and the intermediate layer of pure aluminum, the pure tantalum material and the intermediate pure aluminum, an angle grinder is adopted to polish the surface of the material. And (3) polishing by adopting a traditional angle grinder, wherein the polishing time of the surface of the magnesium alloy is 0.5min, the polishing time of the surface of the pure tantalum material is 1min, and no scratch with the depth of more than 0.1mm is observed on the surface visually after polishing. The pure aluminum was not polished.

Specifically, the surface of the polished magnesium alloy and pure tantalum material is cleaned, and the cleaning step is to wipe the polished surface of the material with absolute ethyl alcohol to remove oil stains left by polishing and the like. And uniformly wiping the surface of the material for about 2min by dipping a cotton ball in absolute ethyl alcohol, and quickly compounding the magnesium alloy, the pure aluminum and the pure tantalum material after water stain on the surface is dried after wiping is finished.

Preferably, according to the room-temperature rolling forming method of the light high-strength Mg-Ta composite metal plate, after the first-pass rolling is successful, the second-pass rolling is performed, namely, after the step (4), the rolling steps of the steps (2) to (4), the vacuum low-temperature annealing treatment and the high-temperature diffusion heat treatment are repeated, so that the step of the second-pass rolling is completed, and the rolling reduction of the second-pass rolling is controlled to be 20% -35%.

Preferably, according to the room-temperature rolling forming method for the light-weight high-strength Mg-Ta composite metal plate, after the second-pass rolling is successful, the third-pass rolling is performed, namely, after the step (4), the rolling steps of the steps (2) to (4), the vacuum low-temperature annealing treatment and the high-temperature diffusion heat treatment are repeated, so that the step of the third-pass rolling is completed, and the rolling reduction of the third-pass rolling is controlled to be 15% -25%.

The invention also discloses an application of the light high-strength Mg-Ta composite metal plate or the light high-strength Mg-Ta composite metal plate obtained by the method in the field of aerospace.

According to the light high-strength Mg-Ta composite metal plate, the conventional dissimilar metal rolling thought is used for reference, and the interface diffusion between magnesium and aluminum and between tantalum and aluminum is promoted by additionally rolling the pure aluminum interlayer, so that the magnesium and the tantalum are connected through the interlayer. Because the light metal such as metal aluminum and the like also has lower density and good extensibility, the composite material is suitable for being combined with other metals. The research of the scheme of the invention shows that the magnesium-aluminum binary phase diagram shown in figure 2 can realize element diffusion between magnesium and aluminum from 0 ℃, and solid solution can be completely formed between two metal components with any component proportion at about 450 ℃, so that the bonding performance between the two materials is excellent. The binary phase diagram of aluminum-tantalum shown in fig. 3 shows that aluminum and tantalum are more easily diffused into tantalum as the content of aluminum decreases, and can be completely dissolved into tantalum components at about 300 ℃ at the lowest when the content of aluminum is extremely low, while when the content of aluminum increases, compounds between aluminum and tantalum appear in the binary phase diagram, and solid solution structures between aluminum and tantalum are generated at a lower temperature.

According to the room-temperature forming method of the light high-strength Mg-Ta composite metal plate, on the basis of a cold rolling forming process, in order to promote the smooth proceeding of interface metallurgical bonding and rolling between magnesium alloy and pure tantalum, low-temperature annealing and high-temperature diffusion processes are respectively adopted between two passes, so that the residual stress between the rolled plates between the passes can be further reduced, the interface atomic diffusion and fusion are effectively promoted, effective metallurgical bonding is quickly formed, a mechanical and metallurgical coexisting high-strength interface is formed, and the rolling forming of the next pass is further promoted. In conclusion, the aluminum layer metal is used as a rolling combination medium of the magnesium metal and the tantalum metal, low-temperature and high-temperature heat treatment between passes is achieved, rolling forming at room temperature is achieved between dissimilar metal magnesium alloy and other metals, compared with products under the traditional hot rolling forming process, the production efficiency is higher, and strength performance is better on the basis of guaranteeing light weight performance.

According to the light high-strength Mg-Ta composite metal plate, the light metal rolled pure aluminum intermediate layer is additionally arranged between the magnesium alloy plate and the tantalum metal plate, and low-temperature and high-temperature heat treatment is additionally arranged between rolling passes, so that good mechanical and metallurgical interfaces are formed between magnesium and tantalum metal through the selected light metal, the magnesium-tantalum composite plate with the advantages of light weight and high strength is successfully prepared, the blank of room-temperature rolling forming of the magnesium-tantalum composite metal plate at home and abroad is filled, and meanwhile, support is provided for developing a special shielding structure of a deep space exploration spacecraft.

Drawings

In order that the present disclosure may be more readily and clearly understood, the following detailed description of the present disclosure is provided in connection with specific embodiments thereof and the accompanying drawings, in which,

FIG. 1 is a binary phase diagram of Mg-Ta;

FIG. 2 is a Mg-Al binary phase diagram;

FIG. 3 is a binary phase diagram of Al-Ta;

FIG. 4 is a flow chart of the room temperature rolling process of the magnesium-aluminum-tantalum composite plate according to the present invention;

FIG. 5 is a scanning electron micrograph of the interface of a 45% (first pass) rolled sheet; wherein (a) is magnesium alloy non-annealed (comparative example 1), left side is magnesium, right side is aluminum; (b) annealing treatment of magnesium alloy (example 1), wherein magnesium-aluminum-tantalum is sequentially arranged above, in the middle and below;

FIG. 6 is a graph of the diffusion width of the magnesium-aluminum interface of the 45% (first pass) reduction composite sheet; wherein, (a) is a magnesium-aluminum interface diffusion width diagram of the composite board after diffusion heat treatment (example 1); (b) a graph of the magnesium-aluminum interface diffusion width of the non-diffusion heat-treated composite plate (comparative example 2);

FIG. 7 is a stress-strain curve of the composite plate obtained in example 1 in each pass;

FIG. 8 is a schematic view of a magnesium/tantalum composite metal plate after a first pass rolling;

FIG. 9 is a shape diagram of the magnesium/tantalum composite metal plate after the second pass rolling;

fig. 10 is a view showing the magnesium/tantalum composite metal plate after the third rolling.

Detailed Description

In the following embodiments of the invention, the preparation material of the light high-strength Mg-Ta composite metal plate comprises an AZ31B magnesium alloy plate, a 1060 metal aluminum plate and an experimental high-purity tantalum plate, wherein the tantalum plate comprises the following components: c-0.01%, H-0.015%, O-0.015%, Nb-0.05%, Fe-0.005%, W-0.01%, Mo-0.01%, Si-0.005%, and the balance of Ta.

Example 1

The room-temperature rolling forming method (one-pass rolling) for the light high-strength Mg-Ta composite metal plate comprises the following steps:

(1) preparing AZ31B magnesium alloy, 1060 aluminum alloy and pure tantalum plates, wherein the thickness of the magnesium alloy plate is 1 +/-0.2 mm, the thickness of the 1060 aluminum alloy is 0.1 +/-0.03 mm, the thickness of the pure tantalum plate is 1 +/-0.2 mm, the chemical compositions of the AZ31B material and the pure aluminum intermediate layer meet the regulations of national standards GB/T5153-2016 and GB/T3190-2020, the chemical compositions of the pure tantalum are shown in table 1, and the sizes of the materials are shown in table 2 below;

TABLE 1 pure tantalum composition Table

Element(s)	C	H	O	Nb	Fe	W	Mo	Si	Ta
										(wt％)	0.010	0.015	0.015	0.050	0.005	0.010	0.010	0.005	Bal.

TABLE 2 magnesium/aluminum/tantalum sheet size diagram

Material	Long (mm)	Width (mm)	Thickness (mm)
				AZ31B	150(±1)	150(±1)	1(±0.1)
Ta	150(±1)	150(±1)	1(±0.1)
				Al	150(±1)	150(±1)	0.5(±0.02)

Annealing the magnesium alloy plate, namely, keeping the temperature at the constant temperature of 270 ℃ for 2.5 hours in a vacuum tube type high-temperature furnace, and then performing air cooling treatment for later use;

polishing the surfaces of the AZ31 magnesium alloy (after annealing) and the pure tantalum plate (after annealing) by using an angle grinder to remove an oxide film on the surface of the material, wherein the surface of the magnesium alloy is polished for about 0.5min, and the surface of the pure tantalum plate is polished for about 1 min; subsequently, wiping the polished surface of the material with absolute ethyl alcohol to remove oil stains left by polishing and the like; the pure aluminum interlayer is not polished;

(2) stacking the processed plate samples according to the sequence of AZ31 magnesium alloy plate, pure aluminum plate, pure tantalum plate, pure aluminum plate, AZ31 magnesium alloy plate from bottom to top, wherein the speed of a roller is 50r/min-90r/min, the rolling reduction is 45%, and passing the stacked samples through a rolling mill at room temperature to manufacture an alloy composite plate;

(3) because the rolled plate is seriously deformed and has larger stress inside, in order to remove the residual stress, the rolled plate is placed in a vacuum heat treatment furnace and is subjected to heat preservation annealing treatment for 3 hours at 200 ℃ in the argon atmosphere;

(4) in order to optimize the rolled composite plate interface and obtain a material with good metallurgical bonding at the interface, the embodiment performs diffusion heat treatment on the annealed rolled plate, that is, performs heat preservation heat treatment at 450 ℃ for 1h under uniform pressure of 0.07MPa, so as to obtain the composite plate.

Comparative example 1

The method of manufacturing a light Mg — Ta composite metal plate according to this comparative example is the same as example 1 except that the magnesium alloy plate is not subjected to the low-temperature annealing treatment in the step (3).

Comparative example 2

The preparation method of the light-weight high-strength radiation-proof Mg-Ta/Al composite metal plate in the comparative example is the same as that in the example 1, only the step (4) is carried out without diffusion heat treatment.

As shown in fig. 5, which is a scanning electron micrograph of the interface of the rolled sheets of example 1 and comparative example 1 with 45% (first pass) reduction, the magnesium/aluminum interface is tightly bonded and the mechanical connection is good under the observation of the scanning electron microscope; the aluminum/tantalum interface is equally tight and the mechanical connection is good. Thus, at 45% reduction in pass 1, good mechanical connection was achieved at all three material interfaces.

As shown in fig. 6, line scanning is performed on the magnesium-aluminum interface of the composite metal plate samples in example 1 and comparative example 2, and at the magnesium-aluminum interface, the macroscopic region of the line scanning curve is smooth, which indicates that partial element diffusion occurs in the magnesium-aluminum composite plate at the interface; the magnesium-aluminum interface of the two samples was observed and no significant interdiffusion layer was found to form. After high-temperature diffusion heat treatment, the line scanning result shows that the diffusion width of the diffused atoms is increased, which indicates that the combination at the magnesium-aluminum interface is enhanced. The diffusion widths at the magnesium-aluminum interface were line-scanned by energy spectrum analysis, and found to be 5.2 μm and 3.2 μm, respectively, for the magnesium-aluminum interface after the high-temperature diffusion treatment and the untreated sample. Therefore, after high-temperature diffusion treatment, the diffusion width at the magnesium-aluminum interface is obviously increased, which shows that the metallurgical bonding of the interface of the rolled plate is obviously increased by diffusion heat treatment.

On the basis of the composite plate successfully formed by rolling in the first pass in the embodiment 1, the second pass of rolling is continued according to the scheme in the embodiment 1, namely, the steps (2) and (4) are repeated, and the parameters of the method are different from the scheme in the embodiment 1 only in that the rolling reduction is controlled to be 25%, so that the magnesium/tantalum composite metal plate after the second pass of rolling is obtained.

On the basis of the magnesium/tantalum composite metal plate after the second rolling, the third rolling is continued according to the scheme in the embodiment 1, namely, the steps (2) and (4) are repeated again, and the difference of all the parameters is the same as the scheme in the embodiment 1, namely, the magnesium/tantalum composite metal plate after the third rolling is obtained by controlling the rolling reduction to be 20%.

The form diagrams of the magnesium/tantalum composite metal plate after the first pass, the second pass and the third pass of rolling are shown in fig. 8-10, and it can be seen that the form and the quality of each plate are good, which indicates that the room temperature rolling method of the invention has good operability and good effect and performance of the formed product.

As shown in fig. 7, which is the real stress-strain curves of the magnesium/tantalum composite metal plate in the first pass, the second pass and the third pass, it can be seen that the tensile strength of the composite metal plate gradually increases with the increase of the rolling passes, and the tensile strength of the composite metal plate is 37Mpa, 55Mpa and 105Mpa under the rolling passes of 1 pass, 2 passes and 3 passes, respectively.

Example 2

The room-temperature rolling method for the light high-strength Mg-Ta/Al composite metal plate comprises the following steps:

(1) AZ31B magnesium alloy, 1060 aluminum alloy and pure tantalum plate were prepared, and the properties of each plate were the same as those of example 1; annealing the magnesium alloy plate, namely, keeping the temperature of the magnesium alloy plate at a constant temperature of 230 ℃ for 2 hours in a vacuum tube type high-temperature furnace, and then performing air cooling treatment for later use;

polishing the surfaces of the AZ31 magnesium alloy (after annealing), the pure aluminum plate and the pure tantalum plate by using an angle grinder to remove an oxide film on the surface of the material, wherein the surface of the magnesium alloy is polished for about 0.5min, and the surface of the pure tantalum plate is polished for about 1 min; subsequently, wiping the polished surface of the material with absolute ethyl alcohol to remove oil stains left by polishing and the like; the pure aluminum interlayer is not polished;

(2) stacking the processed plate samples according to the sequence of AZ31 magnesium alloy plate, pure aluminum plate, pure tantalum plate, pure aluminum plate, AZ31 magnesium alloy plate from bottom to top, wherein the speed of a roller is 50r/min-90r/min, the rolling reduction is 55%, and passing the stacked samples through a rolling mill at room temperature to manufacture an alloy composite plate;

(3) because the rolled plate is seriously deformed and has larger stress inside, in order to remove the stress, the rolled plate is placed in a vacuum heat treatment furnace and is subjected to heat preservation annealing treatment for 4 hours at 150 ℃ in the argon atmosphere;

(4) in order to optimize the interface of the rolled composite plate and obtain an interface with good metallurgical bonding, the embodiment performs diffusion heat treatment on the annealed rolled plate, namely performs heat preservation heat treatment for 1.3 hours at 420 ℃ under uniform pressure of 0.05 MPa.

Example 3

(1) AZ31B magnesium alloy, 1060 aluminum alloy and pure tantalum plate were prepared, and the properties of each plate were the same as those of example 1; annealing the magnesium alloy plate, namely, keeping the temperature at the constant temperature of 250 ℃ for 1.8 hours in a vacuum tube type high-temperature furnace, and then performing air cooling treatment for later use;

polishing the surfaces of the AZ31 magnesium alloy (after annealing), the pure aluminum plate and the pure tantalum plate by using an angle grinder to remove an oxide film on the surface of the material, wherein the surface of the magnesium alloy is polished for about 0.5min, and the surface of the pure tantalum plate is polished for about 1 min; (ii) a Subsequently, wiping the polished surface of the material with absolute ethyl alcohol to remove oil stains left by polishing and the like; the pure aluminum interlayer is not polished;

(2) stacking the processed plate samples according to the sequence of AZ31 magnesium alloy plate, pure aluminum plate, pure tantalum plate, pure aluminum plate, AZ31 magnesium alloy plate from bottom to top, wherein the speed of a roller is 50r/min-90r/min, the rolling reduction is 65%, and passing the stacked samples through a rolling mill at room temperature to manufacture an alloy composite plate;

(3) because the rolled plate is seriously deformed and has larger stress inside, in order to remove the stress, the rolled plate is placed in a vacuum heat treatment furnace and is subjected to heat preservation annealing treatment for 3 hours at 180 ℃ in an argon atmosphere;

(4) in order to optimize the rolled composite plate interface and obtain an interface with good metallurgical bonding, the annealed rolled plate is subjected to diffusion heat treatment, namely, heat preservation heat treatment is carried out for 1.5 hours at 470 ℃ under the uniform pressure of 0.03 MPa.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. The room-temperature rolling forming method of the light high-strength Mg-Ta composite metal plate is characterized in that the light high-strength Mg-Ta composite metal plate comprises a magnesium alloy plate layer, a pure aluminum intermediate layer, a pure tantalum plate layer, a pure aluminum intermediate layer and a magnesium alloy plate layer which are sequentially compounded, wherein a diffusion interface exists between the adjacent plate layers;

the thickness of the pure aluminum intermediate layer is 0.05-0.15 mm;

the thickness of the magnesium alloy plate layer is 0.3-1.0 mm;

the thickness of the pure tantalum plate layer is 0.6-1.5 mm;

the method comprises the following steps:

(3) carrying out vacuum low-temperature annealing treatment on the rolled composite board in a protective atmosphere; the vacuum low-temperature annealing treatment step comprises the step of preserving heat for 0.5-4 h at the temperature of 145-200 ℃ and the step of air cooling to room temperature;

(4) carrying out high-temperature diffusion heat treatment on the composite board subjected to the vacuum low-temperature annealing treatment; the high-temperature diffusion heat treatment step comprises the steps of preserving heat for 0.5-1.5 h under the conditions of the temperature of 400-470 ℃ and the pressure of 0.05-0.1 MPa, and air cooling to room temperature;

the step of repeating the steps (2) to (4) after the step (4) to perform second-pass rolling, wherein the rolling reduction of the second pass is controlled to be 20-35%;

and (3) repeating the steps (2) - (4) to perform third rolling after the second rolling step, wherein the rolling reduction of the third rolling is controlled to be 15% -25%.

2. The room temperature roll forming method of light weight and high strength Mg-Ta composite metal plate as claimed in claim 1, wherein in the step (2), the control parameters of the room temperature cold rolling forming step comprise: the speed range of the roller is controlled to be 50r/min-90r/min, and the rolling amount is controlled to be 40% -70%.

3. The room temperature roll forming method of light weight high strength Mg-Ta composite metal plate as claimed in claim 1, wherein in the step (1):

controlling the annealing temperature of the magnesium alloy plate to be 225-300 ℃, keeping the temperature for 1.5-3.5 h, and air-cooling to room temperature;

controlling the annealing temperature of the pure tantalum plate to be 1040-1480 ℃, keeping the temperature for 2.5-5.5 h, and air-cooling to the room temperature.

4. A light weight, high strength Mg-Ta composite metal sheet formed by the method of any one of claims 1 to 3.

5. Use of the light weight, high strength Mg-Ta composite metal sheet according to claim 4 in the field of aerospace.