A method for preparing high-strength beryllium / aluminum composite material plate

Abstract

A method for preparing a high-strength beryllium / aluminum composite material sheet is disclosed. The purpose is to address the current difficulties in forming and low strength of beryllium / aluminum composite materials. The method first prepares the beryllium / aluminum composite material using pure aluminum as a matrix, then produces a beryllium / aluminum composite sheet by rolling. The beryllium / aluminum composite sheet is then alloyed with a metal foil by laminating and diffusing the sheet at high temperature, thereby strengthening the beryllium particles and successfully producing the high-strength beryllium / aluminum composite sheet. The beryllium / aluminum composite material is first prepared using pure aluminum as a matrix. Aluminum, as a matrix, has low strength but high plasticity, making it easy to form, thus addressing the difficulty in forming beryllium / aluminum composite materials. The high-strength beryllium / aluminum composite sheet produced by the present invention exhibits a tensile strength exceeding 534 MPa, a yield strength exceeding 468 MPa, and an elongation exceeding 5.6%.

Description

Technical Field

[0001] The invention relates to a method for preparing a high-strength beryllium / aluminum composite material plate. Background Art

[0002] Due to their unique properties, beryllium / aluminum composites exhibit excellent performance characteristics of high strength, high stiffness, and low density, making them a highly promising structural material. The lightweight nature of beryllium / aluminum composites enables them to excel in the aerospace and defense science and technology fields, effectively meeting the stringent material performance requirements of these industries. In the aerospace field, beryllium / aluminum composites can be used to manufacture key components such as aircraft fuselages and wings, which have extremely high requirements for strength and stiffness while minimizing weight to improve flight performance and fuel efficiency. In defense science and technology, this material is also suitable for the manufacture of various weapons, equipment, and protective devices, providing a solid foundation for improving overall combat capabilities.

[0003] With the development of technology and the deepening of its application, the market demand for beryllium / aluminum composite materials is becoming more urgent. The research and development of new beryllium / aluminum composite materials to improve their processability, specific stiffness and yield strength has become a key research direction in the industry. However, there are still difficulties in how to prepare high-strength beryllium / aluminum composite materials. The choice of aluminum matrix alloy in beryllium / aluminum composite materials has a significant impact on the performance of the material. For example, when the 2XXX series is selected as the matrix, the strength of the beryllium / aluminum composite material can be significantly improved, but it will lead to a decrease in plasticity, making it difficult to achieve sheet forming. When pure Al is used as the matrix, the formability of the beryllium / aluminum composite material can be improved, but the strength cannot meet the requirements. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of difficult forming and low strength of current beryllium / aluminum composite materials, and to prepare beryllium / aluminum composite material plates efficiently and at low cost by adopting a method of realizing solid composite material alloying through high temperature diffusion.

[0005] The preparation method of the high-strength beryllium / aluminum composite material plate of the present invention is carried out according to the following steps:

[0006] Step 1: Preparation of Be / Aluminum Composite Material

[0007] A beryllium / aluminum composite material is prepared by a self-exhaust pressure infiltration method; the volume fraction of beryllium powder in the beryllium / aluminum composite material is 20% to 70%, and the aluminum matrix in the beryllium / aluminum composite material is pure aluminum;

[0008] Step 2: Thermal preheating of the beryllium / aluminum composite material and rolling mill rolls

[0009] First, the beryllium / aluminum composite material is preheated to a temperature of 400-600°C, and then kept at 400-600°C for 0.5-6 hours; the rolling mill roller is preheated to a temperature 10-100°C lower than the preheating temperature of the beryllium / aluminum composite material and kept at this temperature for 0.5-6 hours;

[0010] Step 3: Hot rolling to prepare beryllium / aluminum composite material sheets

[0011] The preheated beryllium / aluminum composite material is subjected to multiple hot rolling passes through a rolling mill, and the beryllium / aluminum composite material is annealed after each hot rolling pass to obtain a beryllium / aluminum composite material plate with a thickness of 0.5 to 5 mm;

[0012] Step 4: Preparation of layered metal foil and beryllium / aluminum composite material

[0013] A plurality of beryllium / aluminum composite material plates are stacked and metal foil is placed between adjacent beryllium / aluminum composite material plates to obtain a layered beryllium / aluminum composite material plate, which is then hot-rolled to a thickness of 0.5 to 5 mm;

[0014] The hot rolling process comprises: first preheating the layered beryllium / aluminum composite material plate to a temperature of 400-600° C. and keeping the temperature at 400-600° C. for 0.5-6 hours; preheating the rolling mill rollers to a temperature 10-100° C. lower than the preheating temperature of the layered beryllium / aluminum composite material plate and keeping the temperature for 0.5-6 hours; passing the preheated layered beryllium / aluminum composite material plate through a rolling mill for multiple hot rolling passes, and annealing the layered beryllium / aluminum composite material plate after each hot rolling pass;

[0015] Step 5: Alloying of Be / Aluminum Composite Materials

[0016] The hot-rolled layered beryllium / aluminum composite material plate obtained in step 4 is placed in a muffle furnace and kept at 300-600° C. for 0.5-100 hours to diffuse the alloy elements in the metal foil into the beryllium / aluminum composite material, thereby obtaining a high-strength beryllium / aluminum composite material plate.

[0017] The present invention has the following beneficial effects:

[0018] 1. The present invention first prepares a beryllium / aluminum composite material using pure aluminum as a matrix, then obtains a beryllium / aluminum composite material sheet by rolling, and then alloys the matrix by laminating the beryllium / aluminum composite material sheet with metal foil and performing high-temperature diffusion, thereby achieving the effect of strengthening the beryllium particles and successfully preparing a high-strength beryllium / aluminum composite material sheet. The beryllium / aluminum composite material is first prepared using pure aluminum as a matrix. Aluminum as a matrix has low strength and high plasticity, making it easy to form, thus solving the problem of difficult forming of beryllium / aluminum composite materials. The high-strength beryllium / aluminum composite material sheet prepared by the present invention has a tensile strength of over 534 MPa, a yield strength of over 468 MPa, and an elongation of over 5.6%;

[0019] 2. The present invention provides an efficient and low-cost method for preparing high-strength beryllium / aluminum composite sheet materials. This method is simple, easy to operate, and readily adaptable for industrial production and application. The self-exhausting pressure infiltration method employed in the present invention allows the composite material to be prepared in an atmospheric environment, without the need for inert gas protection. The sheet material preparation process utilizes only one thermal processing step, requiring minimal equipment. The entire process requires only a rolling mill and a muffle furnace, resulting in a low-cost process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Energy spectrum point analysis and surface analysis pictures of copper element diffusion into the matrix and reinforcement of beryllium / aluminum composite material. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is not limited to the specific implementation methods listed below, but also includes any reasonable combination of the specific implementation methods.

[0022] Specific embodiment 1: The preparation method of the high-strength beryllium / aluminum composite material plate of this embodiment is carried out according to the following steps:

[0023] Step 1: Preparation of Be / Aluminum Composite Material

[0024] A beryllium / aluminum composite material is prepared by a self-exhaust pressure infiltration method; the volume fraction of beryllium powder in the beryllium / aluminum composite material is 20% to 70%, and the aluminum matrix in the beryllium / aluminum composite material is pure aluminum;

[0025] Step 2: Thermal preheating of the beryllium / aluminum composite material and rolling mill rolls

[0026] First, the beryllium / aluminum composite material is preheated to a temperature of 400-600°C, and then kept at 400-600°C for 0.5-6 hours; the rolling mill roller is preheated to a temperature 10-100°C lower than the preheating temperature of the beryllium / aluminum composite material and kept at this temperature for 0.5-6 hours;

[0027] Step 3: Hot rolling to prepare beryllium / aluminum composite material sheets

[0028] The preheated beryllium / aluminum composite material is subjected to multiple hot rolling passes through a rolling mill, and the beryllium / aluminum composite material is annealed after each hot rolling pass to obtain a beryllium / aluminum composite material plate with a thickness of 0.5 to 5 mm;

[0029] Step 4: Preparation of layered metal foil and beryllium / aluminum composite material

[0030] A plurality of beryllium / aluminum composite material plates are stacked and metal foil is placed between adjacent beryllium / aluminum composite material plates to obtain a layered beryllium / aluminum composite material plate, which is then hot-rolled to a thickness of 0.5 to 5 mm;

[0031] The hot rolling process comprises: first preheating the layered beryllium / aluminum composite material plate to a temperature of 400-600° C. and keeping the temperature at 400-600° C. for 0.5-6 hours; preheating the rolling mill rollers to a temperature 10-100° C. lower than the preheating temperature of the layered beryllium / aluminum composite material plate and keeping the temperature for 0.5-6 hours; passing the preheated layered beryllium / aluminum composite material plate through a rolling mill for multiple hot rolling passes, and annealing the layered beryllium / aluminum composite material plate after each hot rolling pass;

[0032] Step 5: Alloying of Be / Aluminum Composite Materials

[0033] The hot-rolled layered beryllium / aluminum composite material plate obtained in step 4 is placed in a muffle furnace and kept at 300-600° C. for 0.5-100 hours to diffuse the alloy elements in the metal foil into the beryllium / aluminum composite material, thereby obtaining a high-strength beryllium / aluminum composite material plate.

[0034] This embodiment has the following beneficial effects:

[0035] 1. This embodiment first prepares a beryllium / aluminum composite material using pure aluminum as a matrix, then obtains a beryllium / aluminum composite material sheet by rolling, and then alloys the matrix by laminating the beryllium / aluminum composite material sheet with metal foil and performing high-temperature diffusion, thereby achieving the effect of strengthening the beryllium particles and successfully preparing a high-strength beryllium / aluminum composite material sheet. The beryllium / aluminum composite material is first prepared using pure aluminum as a matrix. Aluminum as a matrix has low strength and high plasticity, making it easy to form, thus solving the problem of difficult forming of beryllium / aluminum composite materials. The high-strength beryllium / aluminum composite material sheet prepared in this embodiment has a tensile strength of over 534 MPa, a yield strength of over 468 MPa, and an elongation of over 5.6%;

[0036] 2. This embodiment provides an efficient and low-cost method for preparing high-strength beryllium / aluminum composite sheet materials. This method is simple, easy to operate, and readily adaptable for industrial production and application. The self-exhausting pressure infiltration method employed in this embodiment allows for the preparation of composite materials in an atmospheric environment, without the need for inert gas protection. The sheet material preparation process utilizes only one thermal processing step, requiring minimal equipment. The entire process requires only a rolling mill and a muffle furnace, resulting in a low-cost process.

[0037] Specific embodiment 2: This embodiment differs from specific embodiment 1 in that: the purity of the beryllium powder in step 1 is greater than 99%, and the average particle size is 5 to 800 μm.

[0038] Specific embodiment three: This embodiment differs from specific embodiments one or two in that: the beryllium powder in step one is one or more of irregular shape, spherical shape and beryllium turning chips.

[0039] Specific embodiment 4: This embodiment differs from any one of specific embodiments 1 to 3 in that: the hot rolling rate in step 3 is 100 mm / min to 100 m / min.

[0040] Specific embodiment 5: This embodiment differs from any one of specific embodiments 1 to 4 in that the deformation amount of each pass in step 3 is 1% to 20%.

[0041] Specific embodiment 6: This embodiment differs from any one of specific embodiments 1 to 5 in that the temperature of the annealing treatment in step 3 is 200-600°C.

[0042] Specific embodiment seven: This embodiment differs from any one of specific embodiments one to six in that the metal foil in step four is steel foil, copper foil, titanium foil, nickel foil, gold foil, silver foil or zinc foil.

[0043] Specific embodiment eight: This embodiment differs from any one of specific embodiments one to seven in that: the thickness of the metal foil in step four is 1 to 200 μm.

[0044] Specific embodiment 9: This embodiment differs from any one of specific embodiments 1 to 8 in that: the hot rolling rate in step 4 is 100 mm / min to 100 m / min; and the deformation amount of each pass is 1% to 20%.

[0045] Specific embodiment ten: This embodiment differs from any one of specific embodiments one to nine in that the temperature of the annealing treatment in step four is 200-600°C.

[0046] Example 1

[0047] The preparation method of the high-strength beryllium / aluminum composite material plate of this embodiment is carried out according to the following steps:

[0048] Step 1: Preparation of Be / Aluminum Composite Material

[0049] A beryllium / aluminum composite material is prepared by a self-exhaust pressure infiltration method; the volume fraction of beryllium powder in the beryllium / aluminum composite material is 60%, and the aluminum matrix in the beryllium / aluminum composite material is pure aluminum;

[0050] The purity of the beryllium powder is 99.5%, and the average particle size is 50 μm; the beryllium powder is industrial beryllium powder with irregular shape;

[0051] The method for preparing beryllium / aluminum composite materials by self-exhaust pressure infiltration is as follows:

[0052] ① Weigh 60% beryllium powder and 40% pure aluminum by volume, load the beryllium powder into a steel mold, and press it into a preform at a pressure of 50 kN for 4 minutes. Then, place the steel mold containing the beryllium powder preform into a preheating furnace and preheat it at 600°C for 2 hours. ② Melt the pure aluminum at 880°C to obtain liquid aluminum, which is then poured into the preheated steel mold in step ①. ③ Move the pressing head downward at a pressure of 50 MPa and a speed of 5 mm / min to allow the liquid aluminum to penetrate into the gaps in the beryllium powder. The pressure is maintained at a pressure of 25 MPa for 3 minutes, and then cooled by circulating water to obtain a beryllium / aluminum composite material.

[0053] Step 2: Thermal preheating of the beryllium / aluminum composite material and rolling mill rolls

[0054] The beryllium / aluminum composite material was preheated to 540°C and then kept at 540°C for 3 hours; the rolling mill rolls were preheated to 450°C and then kept at 450°C for 3 hours;

[0055] Step 3: Hot rolling to prepare beryllium / aluminum composite material sheets

[0056] The preheated beryllium / aluminum composite material is subjected to multiple hot rolling passes through a rolling mill, and the beryllium / aluminum composite material is annealed after each hot rolling pass to obtain a beryllium / aluminum composite material plate with a thickness of 1 mm;

[0057] The hot rolling rate is 240 mm / min;

[0058] The deformation of each pass is 3%;

[0059] The annealing temperature is 345°C;

[0060] Step 4: Preparation of layered metal foil and beryllium / aluminum composite material

[0061] A plurality of beryllium / aluminum composite material plates are stacked and metal foil is placed between adjacent beryllium / aluminum composite material plates to obtain a layered beryllium / aluminum composite material plate, which is then hot rolled to a thickness of 1.2 mm;

[0062] The metal foil is copper foil;

[0063] The thickness of the metal foil is 50 μm;

[0064] The hot rolling process comprises the following steps: preheating the layered beryllium / aluminum composite material plate to a temperature of 540° C. and maintaining the temperature at 540° C. for 3 hours; preheating the rolling mill rollers to 450° C. and maintaining the temperature for 3 hours; passing the preheated layered beryllium / aluminum composite material plate through the rolling mill for multiple hot rolling passes, and annealing the layered beryllium / aluminum composite material plate after each hot rolling pass; the hot rolling rate is 240 mm / min; the deformation of each pass is 3%; and the annealing temperature is 345° C.

[0065] Step 5: Alloying of Be / Aluminum Composite Materials

[0066] The hot-rolled layered beryllium / aluminum composite material plate obtained in step 4 is placed in a muffle furnace and kept at 495° C. for 24 hours to allow the alloy elements in the metal foil to diffuse into the beryllium / aluminum composite material, thereby obtaining a high-strength beryllium / aluminum composite material plate.

[0067] The high-strength beryllium / aluminum composite material plate obtained in this embodiment has a tensile strength of 592 MPa, a yield strength of 521 MPa, and an elongation of 5.6%. Figure 1 Energy spectrum point analysis and surface analysis pictures of copper element diffusion into the matrix and reinforcement of beryllium / aluminum composite material. Figure 1 It can be explained that after rolling and high temperature diffusion, copper elements successfully diffused into the beryllium / aluminum composite material and were evenly distributed, and the spectrum Figure 1 Point analysis shows that some copper elements diffused into the beryllium particles, which played a reinforcing role.

[0068] Example 2

[0069] The preparation method of the high-strength beryllium / aluminum composite material plate of this embodiment is carried out according to the following steps:

[0070] Step 1: Preparation of Be / Aluminum Composite Material

[0071] A beryllium / aluminum composite material is prepared by a self-exhaust pressure infiltration method; the volume fraction of beryllium powder in the beryllium / aluminum composite material is 45%, and the aluminum matrix in the beryllium / aluminum composite material is pure aluminum;

[0072] The purity of the beryllium powder is 99.1%, and the average particle size is 80 μm; the beryllium powder is an irregularly shaped industrial beryllium powder.

[0073] The method for preparing beryllium / aluminum composite materials by self-exhaust pressure infiltration is as follows:

[0074] ① Weigh 45% beryllium powder and 55% pure aluminum by volume, load the beryllium powder into a steel mold, and press it into a preform at a pressure of 70 kN for 10 minutes. Then, place the steel mold containing the beryllium powder preform into a preheating furnace and preheat it at 620°C for 2 hours. ② Melt the pure aluminum at 860°C to obtain liquid aluminum, which is then poured into the steel mold preheated in step ①. ③ Move the pressing head downward at a pressure of 30 MPa and a speed of 6 mm / min to allow the liquid aluminum to penetrate into the gaps in the beryllium powder. The pressure is maintained at 30 MPa for 5 minutes, and then cooled by circulating water to obtain a beryllium / aluminum composite material.

[0075] Step 2: Thermal preheating of the beryllium / aluminum composite material and rolling mill rolls

[0076] The beryllium / aluminum composite material was preheated to 530°C and then kept at 530°C for 2 hours; the rolling mill rolls were preheated to 440°C and kept at that temperature for 3 hours;

[0077] Step 3: Hot rolling to prepare beryllium / aluminum composite material sheets

[0078] The preheated beryllium / aluminum composite material is subjected to multiple hot rolling passes through a rolling mill, and the beryllium / aluminum composite material is annealed after each hot rolling pass to obtain a beryllium / aluminum composite material plate with a thickness of 0.8 mm;

[0079] The hot rolling rate is 500 mm / min;

[0080] The deformation of each pass is 8%;

[0081] The annealing temperature is 400°C;

[0082] Step 4: Preparation of layered metal foil and beryllium / aluminum composite material

[0083] A plurality of beryllium / aluminum composite material plates are stacked and metal foil is placed between adjacent beryllium / aluminum composite material plates to obtain a layered beryllium / aluminum composite material plate, which is then hot-rolled to a thickness of 0.6 mm;

[0084] The metal foil is silver foil;

[0085] The thickness of the metal foil is 40 μm;

[0086] The hot rolling process comprises the following steps: preheating the layered beryllium / aluminum composite material plate to 530° C. and maintaining the temperature at 530° C. for 2 hours; preheating the rolling mill rollers to 440° C. and maintaining the temperature for 3 hours; hot rolling the preheated layered beryllium / aluminum composite material plate through the rolling mill for multiple passes, and annealing the layered beryllium / aluminum composite material plate after each hot rolling pass; the hot rolling rate is 500 mm / min; the deformation of each pass is 8%; and the annealing temperature is 400° C.

[0087] Step 5: Alloying of Be / Aluminum Composite Materials

[0088] The hot-rolled layered beryllium / aluminum composite material plate obtained in step 4 is placed in a muffle furnace and kept at 450° C. for 36 hours to allow the alloy elements in the metal foil to diffuse into the beryllium / aluminum composite material, thereby obtaining a high-strength beryllium / aluminum composite material plate.

[0089] The high-strength beryllium / aluminum composite material plate obtained in this embodiment has a tensile strength of 534 MPa, a yield strength of 468 MPa, and an elongation of 7.5%.

[0090] Example 3

[0091] The preparation method of the high-strength beryllium / aluminum composite material plate of this embodiment is carried out according to the following steps:

[0092] Step 1: Preparation of Be / Aluminum Composite Material

[0093] A beryllium / aluminum composite material is prepared by a self-exhaust pressure infiltration method; the volume fraction of beryllium powder in the beryllium / aluminum composite material is 40%, and the aluminum matrix in the beryllium / aluminum composite material is pure aluminum;

[0094] The purity of the beryllium powder is 99.6%, and the average particle size is 60 μm; the beryllium powder is spherical;

[0095] The method for preparing beryllium / aluminum composite materials by self-exhaust pressure infiltration is as follows:

[0096] ① Weigh 40% beryllium powder and 60% pure aluminum by volume, load the beryllium powder into a steel mold, and press it into a preform at a pressure of 90 kN for 3 minutes. Then, place the steel mold containing the beryllium powder preform into a preheating furnace and preheat it at 530°C for 2 hours. ② Melt the pure aluminum at 840°C to obtain liquid aluminum, which is then poured into the preheated steel mold in step ①. ③ Move the pressing head downward at a pressure of 30 MPa and a speed of 5 mm / min to allow the liquid aluminum to penetrate into the gaps in the beryllium powder. The pressure is maintained at 30 MPa for 3 minutes, and then cooled by circulating water to obtain a beryllium / aluminum composite material.

[0097] Step 2: Thermal preheating of the beryllium / aluminum composite material and rolling mill rolls

[0098] The beryllium / aluminum composite material was preheated to 480°C and then kept at 480°C for 2 hours; the rolling mill rolls were preheated to 400°C and kept at that temperature for 3 hours;

[0099] Step 3: Hot rolling to prepare beryllium / aluminum composite material sheets

[0100] The preheated beryllium / aluminum composite material is subjected to multiple hot rolling passes through a rolling mill, and the beryllium / aluminum composite material is annealed after each hot rolling pass to obtain a beryllium / aluminum composite material plate with a thickness of 1.5 mm;

[0101] The hot rolling rate is 800 mm / min;

[0102] The deformation of each pass is 5%;

[0103] The annealing temperature is 380°C;

[0104] Step 4: Preparation of layered metal foil and beryllium / aluminum composite material

[0105] A plurality of beryllium / aluminum composite material plates are stacked and metal foil is placed between adjacent beryllium / aluminum composite material plates to obtain a layered beryllium / aluminum composite material plate, which is then hot-rolled to a thickness of 2 mm;

[0106] The metal foil is nickel foil;

[0107] The thickness of the metal foil is 80 μm;

[0108] The hot rolling process comprises the following steps: preheating the layered beryllium / aluminum composite material plate to 480° C. and maintaining the temperature at 480° C. for 3 hours; preheating the rolling mill rollers to 400° C. and maintaining the temperature for 3 hours; passing the preheated layered beryllium / aluminum composite material plate through the rolling mill for multiple hot rolling passes, and annealing the layered beryllium / aluminum composite material plate after each hot rolling pass; the hot rolling rate is 800 mm / min; the deformation of each pass is 5%; and the annealing temperature is 380° C.

[0109] Step 5: Alloying of Be / Aluminum Composite Materials

[0110] The hot-rolled layered beryllium / aluminum composite sheet obtained in step 4 was placed in a muffle furnace and maintained at 390°C for 24 hours to allow the alloying elements in the metal foil to diffuse into the beryllium / aluminum composite material, thereby obtaining a high-strength beryllium / aluminum composite sheet. The high-strength beryllium / aluminum composite sheet obtained in this example had a tensile strength of 562 MPa, a yield strength of 486 MPa, and an elongation of 6.2%.

[0111] Example 4

[0112] The preparation method of the high-strength beryllium / aluminum composite material plate of this embodiment is carried out according to the following steps:

[0113] Step 1: Preparation of Be / Aluminum Composite Material

[0114] A beryllium / aluminum composite material is prepared by a self-exhaust pressure infiltration method; the volume fraction of beryllium powder in the beryllium / aluminum composite material is 60%, and the aluminum matrix in the beryllium / aluminum composite material is pure aluminum;

[0115] The beryllium powder has a purity of 99.7% and an average particle size of 100 μm; the beryllium powder is of irregular shape;

[0116] The method for preparing beryllium / aluminum composite materials by self-exhaust pressure infiltration is as follows:

[0117] ① Weigh 60% beryllium powder and 40% pure aluminum by volume, load the beryllium powder into a steel mold, and press it into a preform at a pressure of 100 kN for 3 minutes. Then, place the steel mold containing the beryllium powder preform into a preheating furnace and preheat it at 600°C for 2 hours. ② Melt the pure aluminum at 840°C to obtain liquid aluminum, which is then poured into the steel mold preheated in step ①. ③ Move the pressing head downward at a pressure of 40 MPa and a speed of 5 mm / min to allow the liquid aluminum to penetrate into the gaps in the beryllium powder. The pressure is maintained at 40 MPa for 5 minutes, and then cooled by circulating water to obtain a beryllium / aluminum composite material.

[0118] Step 2: Thermal preheating of the beryllium / aluminum composite material and rolling mill rolls

[0119] The beryllium / aluminum composite material is first preheated to a temperature of 500°C and then kept at 500°C for 2 hours; the rolling mill roller is preheated to a temperature of 450°C and kept at this temperature for 2 hours;

[0120] Step 3: Hot rolling to prepare beryllium / aluminum composite material sheets

[0121] The preheated beryllium / aluminum composite material is subjected to multiple hot rolling passes through a rolling mill, and the beryllium / aluminum composite material is annealed after each hot rolling pass to obtain a beryllium / aluminum composite material plate with a thickness of 2 mm;

[0122] The hot rolling rate is 1000 mm / min;

[0123] The deformation of each pass is 6%;

[0124] The annealing temperature is 345°C;

[0125] Step 4: Preparation of layered metal foil and beryllium / aluminum composite material

[0126] A plurality of beryllium / aluminum composite material plates are stacked and metal foil is placed between adjacent beryllium / aluminum composite material plates to obtain a layered beryllium / aluminum composite material plate, which is then hot-rolled to a thickness of 2.5 mm;

[0127] The metal foil is zinc foil;

[0128] The thickness of the metal foil is 50 μm;

[0129] The hot rolling process comprises: preheating the layered beryllium / aluminum composite material plate to 500° C. and maintaining the temperature at 500° C. for 2 hours; preheating the rolling mill rollers to 450° C. and maintaining the temperature for 2 hours; passing the preheated layered beryllium / aluminum composite material plate through the rolling mill for multiple hot rolling passes, and annealing the layered beryllium / aluminum composite material plate after each hot rolling pass; the hot rolling rate is 1000 mm / min; the deformation of each pass is 6%; and the annealing temperature is 345° C.

[0130] Step 5: Alloying of Be / Aluminum Composite Materials

[0131] The hot-rolled layered beryllium / aluminum composite sheet obtained in step 4 was placed in a muffle furnace and maintained at 450°C for 24 hours to allow the alloying elements in the metal foil to diffuse into the beryllium / aluminum composite material, thereby obtaining a high-strength beryllium / aluminum composite sheet. The high-strength beryllium / aluminum composite sheet obtained in this example had a tensile strength of 589 MPa, a yield strength of 534 MPa, and an elongation of 5.2%.

[0132] Example 5

[0133] The preparation method of the high-strength beryllium / aluminum composite material plate of this embodiment is carried out according to the following steps:

[0134] Step 1: Preparation of Be / Aluminum Composite Material

[0135] A beryllium / aluminum composite material is prepared by a self-exhaust pressure infiltration method; the volume fraction of beryllium powder in the beryllium / aluminum composite material is 55%, and the aluminum matrix in the beryllium / aluminum composite material is pure aluminum;

[0136] The beryllium powder in step 1 has a purity greater than 99.2% and an average particle size of 300 μm; the beryllium powder is beryllium turning chips;

[0137] The method for preparing beryllium / aluminum composite materials by self-exhaust pressure infiltration is as follows:

[0138] ① Weigh 55% beryllium powder and 45% pure aluminum by volume, load the beryllium powder into a steel mold, and press it into a preform at a pressure of 110 kN for 3 minutes. Then, place the steel mold containing the beryllium powder preform into a preheating furnace and preheat it at 550°C for 2 hours. ② Melt the pure aluminum at 850°C to obtain liquid aluminum, which is then poured into the preheated steel mold in step ①. ③ Move the pressing head downward at a pressure of 40 MPa and a speed of 5 mm / min to allow the liquid aluminum to penetrate into the gaps in the beryllium powder. The pressure is maintained at 40 MPa for 4 minutes, and then cooled by circulating water to obtain a beryllium / aluminum composite material.

[0139] Step 2: Thermal preheating of the beryllium / aluminum composite material and rolling mill rolls

[0140] The beryllium / aluminum composite material was preheated to 550°C and then kept at 550°C for 2 hours; the rolling mill rolls were preheated to 510°C and kept at this temperature for 3 hours;

[0141] Step 3: Hot rolling to prepare beryllium / aluminum composite material sheets

[0142] The preheated beryllium / aluminum composite material is subjected to multiple hot rolling passes through a rolling mill, and the beryllium / aluminum composite material is annealed after each hot rolling pass to obtain a beryllium / aluminum composite material plate with a thickness of 1.5 mm;

[0143] The hot rolling rate is 300 mm / min;

[0144] The deformation of each pass is 4%;

[0145] The annealing temperature is 360°C;

[0146] Step 4: Preparation of layered metal foil and beryllium / aluminum composite material

[0147] stacking a plurality of beryllium / aluminum composite sheets and placing metal foil between adjacent beryllium / aluminum composite sheets to obtain a layered beryllium / aluminum composite sheet, which is then hot-rolled to a thickness of 1.8 mm;

[0148] The metal foil is copper foil;

[0149] The thickness of the metal foil is 100 μm;

[0150] The hot rolling process comprises the following steps: preheating the layered beryllium / aluminum composite material plate to a temperature of 550° C. and maintaining the temperature at 550° C. for 2 hours; preheating the rolling mill rollers to 510° C. and maintaining the temperature for 3 hours; hot rolling the preheated layered beryllium / aluminum composite material plate through the rolling mill for multiple passes, and annealing the layered beryllium / aluminum composite material plate after each hot rolling pass; the hot rolling rate is 300 mm / min; the deformation of each pass is 4%; and the annealing temperature is 360° C.

[0151] Step 5: Alloying of Be / Aluminum Composite Materials

[0152] The hot-rolled layered beryllium / aluminum composite sheet obtained in step 4 was placed in a muffle furnace and maintained at 540°C for 12 hours to allow the alloying elements in the metal foil to diffuse into the beryllium / aluminum composite material, thereby obtaining a high-strength beryllium / aluminum composite sheet. The high-strength beryllium / aluminum composite sheet obtained in this example had a tensile strength of 605 MPa, a yield strength of 532 MPa, and an elongation of 5.4%.

Claims

1. A method for preparing a high-strength beryllium / aluminum composite material plate, characterized by: The preparation method of the high-strength beryllium / aluminum composite material plate is carried out according to the following steps: Step 1: Preparation of Be / Aluminum Composite Material A beryllium / aluminum composite material is prepared by a self-exhaust pressure infiltration method; the volume fraction of beryllium powder in the beryllium / aluminum composite material is 20% to 70%, and the aluminum matrix in the beryllium / aluminum composite material is pure aluminum; The average particle size of the beryllium powder is 50 to 300 μm; Step 2: Thermal preheating of the beryllium / aluminum composite material and rolling mill rolls First, the beryllium / aluminum composite material is preheated to a temperature of 400-600°C, and then kept at 400-600°C for 0.5-6 hours; the rolling mill roller is preheated to a temperature 10-100°C lower than the preheating temperature of the beryllium / aluminum composite material and kept at this temperature for 0.5-6 hours; Step 3: Hot rolling to prepare beryllium / aluminum composite material sheets The preheated beryllium / aluminum composite material is subjected to multiple hot rolling passes through a rolling mill, and the beryllium / aluminum composite material is annealed after each hot rolling pass to obtain a beryllium / aluminum composite material plate with a thickness of 0.5 to 5 mm; Step 4: Preparation of layered metal foil and beryllium / aluminum composite material A plurality of beryllium / aluminum composite material plates are stacked and metal foil is placed between adjacent beryllium / aluminum composite material plates to obtain a layered beryllium / aluminum composite material plate, which is then hot-rolled to a thickness of 0.5 to 5 mm; The hot rolling process comprises: first preheating the layered beryllium / aluminum composite material plate to a temperature of 400-600° C. and keeping the temperature at 400-600° C. for 0.5-6 hours; preheating the rolling mill rollers to a temperature 10-100° C. lower than the preheating temperature of the layered beryllium / aluminum composite material plate and keeping the temperature for 0.5-6 hours; passing the preheated layered beryllium / aluminum composite material plate through a rolling mill for multiple hot rolling passes, and annealing the layered beryllium / aluminum composite material plate after each hot rolling pass; Step 5: Alloying of Be / Aluminum Composite Materials The hot-rolled layered beryllium / aluminum composite material plate obtained in step 4 is placed in a muffle furnace and kept at 300-600° C. for 0.5-100 hours to diffuse the alloy elements in the metal foil into the beryllium / aluminum composite material, thereby obtaining a high-strength beryllium / aluminum composite material plate.

2. The method for preparing a high-strength beryllium / aluminum composite material plate according to claim 1, characterized in that: The beryllium powder in step 1 is one or more of irregular shape, spherical shape and beryllium turning chips.

3. The method for preparing the high-strength beryllium / aluminum composite material plate according to claim 1, characterized in that: The hot rolling rate in step 3 is 100 mm / min to 100 m / min.

4. The method for preparing the high-strength beryllium / aluminum composite material plate according to claim 1, wherein: The deformation amount of each pass in step 3 is 1% to 20%.

5. The method for preparing the high-strength beryllium / aluminum composite material plate according to claim 1, characterized in that: The temperature of the annealing treatment in step 3 is 200-600°C.

6. The method for preparing a high-strength beryllium / aluminum composite material plate according to claim 1, wherein: The metal foil in step 4 is steel foil, copper foil, titanium foil, nickel foil, gold foil, silver foil or zinc foil.

7. The method for preparing a high-strength beryllium / aluminum composite material plate according to claim 1, wherein: The thickness of the metal foil in step 4 is 1 to 200 μm.

8. The method for preparing a high-strength beryllium / aluminum composite material plate according to claim 1, wherein: The hot rolling rate in step 4 is 100 mm / min to 100 m / min; the deformation amount in each pass is 1% to 20%.

9. The method for preparing a high-strength beryllium / aluminum composite material plate according to claim 1, wherein: The temperature of the annealing treatment in step 4 is 200-600°C.

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