An intermetallic compound layer composite containing residual aluminum and a preparation method and application thereof

Abstract

The application provides an intermetallic compound layered composite material containing residual aluminum and a preparation method and application thereof, and belongs to the technical field of composite materials. The composite material provided by the application comprises n TC4 layers, n-1 Al layers and 2n-2 intermetallic compound layers; the TC4 layers and the Al layers are arranged alternately, and the intermetallic compound layers are located in the middle of the TC4 layers and the Al layers. The application can significantly offset the crack propagation path and consume crack propagation energy through a large number of heterogeneous interfaces between layers, so that the toughness of the material is enhanced. By introducing the residual aluminum layer, the elongation is improved while the high strength is obtained, and innovative design ideas and feasible technical means are provided for realizing the strengthening and toughening design of the composite material. The results of the embodiments show that the tensile strength of the composite material provided by the application can reach 640 MPa at most, and the elongation can reach 4.6% at most.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite materials, and in particular to an intermetallic compound layered composite material containing residual aluminum and a preparation method and application thereof. BACKGROUND

[0002] In recent years, Al3Ti has attracted much attention due to its low density, high Young's modulus, high high-temperature strength and excellent creep resistance. Therefore, Al3Ti has great application potential in aerospace and armor protection. However, the intermetallic compound has poor fracture toughness at room temperature, which seriously limits its further engineering application. In recent years, researchers have successfully improved the toughness of Al3Ti intermetallic compound by introducing a layered structure (Lyu S, Sun Y, et al., Effect of layer sequence on the mechanical properties of Ti / TiAl laminates [J]. Materials & Design, 2018, 143: 160-168. / Zhu H, Sun W, et al., Interfacial characteristics and mechanical properties of TiAl / Ti6Al4V laminate composite (LMC) fabricated by vacuum hot pressing [J]. Materials Science and Engineering: A, 2019, 742: 704-711.). The fracture toughness of Ti / Al3Ti intermetallic compound layered composite material composed of alternating tough titanium layers and brittle Al3Ti layers is comparable to that of high-strength steel, which is significantly improved compared to the uniform structure commonly found in Al3Ti intermetallic compounds. However, the inherent disadvantage of poor ductility (elongation rate of only 1-3%) of the layered composite material still restricts its wide engineering application. Therefore, under the stringent requirements of structural materials in important fields such as aerospace and national defense, how to provide a composite material with the advantages of light weight, high strength, high ductility and high toughness has become a technical problem to be solved in the field. SUMMARY

[0003] The present application relates to the technical field of composite materials, and in particular to an intermetallic compound layered composite material containing residual aluminum and a preparation method and application thereof.

[0004] In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions:

[0005] The application provides an intermetallic compound layered composite material containing residual aluminum, comprising n TC4 layers, n-1 Al layers and 2n-2 intermetallic compound layers.

[0006] The TC4 layers and the Al layers are arranged alternately, and the intermetallic compound layers are located in the middle of the TC4 layers and the Al layers.

[0007] Preferably, the n is a natural number greater than or equal to 3.

[0008] Preferably, the TC4 layer is a Ti-6Al-4V layer.

[0009] Preferably, the intermetallic compound layer is an Al3Ti layer.

[0010] Preferably, the thickness of the TC4 layer is independently 105.8-129.5 μm, the thickness of the Al layer is independently 33.1-119.4 μm, and the thickness of the intermetallic compound layer is independently 23.2-86.2 μm.

[0011] Preferably, the total thickness of the intermetallic compound layered composite material containing residual aluminum is 1.5-3 mm.

[0012] The application provides a preparation method of the intermetallic compound layered composite material containing residual aluminum.

[0013] (1) alternately stack TC4 foils and Al foils from bottom to top to obtain a composite material;

[0014] (2) vacuum hot-press the composite material obtained in the step (1) to obtain the intermetallic compound layered composite material containing residual aluminum.

[0015] Preferably, the vacuum degree of the vacuum hot-pressing in the step (2) is less than or equal to 10 -3 Pa.

[0016] Preferably, the operation of the vacuum hot-pressing in the step (2) is as follows: under a pressure of 3-5 MPa, the temperature is raised to 500-550 ℃ at a temperature raising speed of 5-8 ℃ / min and is kept for 90-180 min, then the pressure is reduced to 2-2.5 MPa, the temperature is then raised to 600-655 ℃ and is kept for 180-240 min, then the temperature is adjusted to 400-450 ℃, the pressure is reduced to 1-1.5 MPa, and is kept for 60-120 min, and finally the furnace is cooled to room temperature.

[0017] The application provides an application of the intermetallic compound layered composite material containing residual aluminum or the intermetallic compound layered composite material containing residual aluminum prepared by the preparation method in the field of aerospace and armored protection.

[0018] The application provides an intermetallic compound layered composite material containing residual aluminum, comprising n TC4 layers, n-1 Al layers and 2n-2 intermetallic compound layers; the TC4 layers and the Al layers are arranged alternately, and the intermetallic compound layers are located in the middle of the TC4 layers and the Al layers. The intermetallic compound layered composite material containing residual aluminum provided by the application comprises a plurality of TC4 layers, Al layers and intermetallic compound layers, and a large number of heterogeneous interfaces between the layers can significantly offset the crack propagation path and consume crack propagation energy, so that the toughness of the material is enhanced; by introducing the residual aluminum layer between the TC4 layer and the intermetallic compound layer, the ductility of the composite material is greatly improved while high strength is obtained, which provides an innovative design idea and a feasible technical means for realizing the strengthening and toughening design of the composite material. The results of the embodiments show that the intermetallic compound layered composite material containing residual aluminum provided by the application is tested for multiple times, the maximum tensile strength can reach 640 MPa, and the maximum elongation can reach 4.6%, compared with the traditional Ti / Al3Ti intermetallic compound layered composite material, the mechanical properties are significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A structure schematic diagram of the intermetallic compound layered composite material containing residual aluminum prepared in the embodiment 1 and the embodiment 2 of the application;

[0020] Figure 2 A temperature and pressure change curve of the vacuum hot pressing of the embodiment 1 of the application in the preparation of the intermetallic compound layered composite material containing residual aluminum with time;

[0021] Figure 3 An SEM image of the intermetallic compound layered composite material containing residual aluminum prepared in the embodiment 1 of the application;

[0022] Figure 4 A temperature and pressure change curve of the vacuum hot pressing of the embodiment 2 of the application in the preparation of the intermetallic compound layered composite material containing residual aluminum with time;

[0023] Figure 5 An SEM image of the intermetallic compound layered composite material containing residual aluminum prepared in the embodiment 2 of the application. DETAILED DESCRIPTION

[0024] The application provides an intermetallic compound layered composite material containing residual aluminum, comprising n TC4 layers, n-1 Al layers and 2n-2 intermetallic compound layers;

[0025] The TC4 layers and the Al layers are arranged alternately, and the intermetallic compound layers are located in the middle of the TC4 layers and the Al layers.

[0026] In the present application, n is preferably a natural number greater than or equal to 3, more preferably 3, 4, 5, 6, 7, 8, 9 or 10, further preferably 7, 8 or 9, and most preferably 8. By controlling the parameter n, the present application can control the number of layers of the TC4 layer, the Al layer and the intermetallic compound layer, thereby further improving the strength, elongation and toughness of the composite material.

[0027] In the present application, the TC4 layer is preferably a Ti-6Al-4V layer, and the intermetallic compound layer is preferably an Al3Ti layer. By introducing a residual aluminum layer between the TC4 layer and the intermetallic compound layer, the present application greatly improves the elongation of the composite material while achieving high strength, thereby providing an innovative design approach and feasible technical means for realizing the strengthening and toughening design of the composite material.

[0028] In the present application, the thickness of the TC4 layer is independently preferably 105.8-129.5 μm, the thickness of the Al layer is independently preferably 33.1-119.4 μm, and the thickness of the intermetallic compound layer is independently preferably 23.2-86.2 μm.

[0029] In the present application, the total thickness of the residual aluminum-containing intermetallic compound layered composite material is preferably 1.5-3 mm, more preferably 2-2.5 mm, and further preferably 2.3 mm. By controlling the total thickness of the composite material, the present application can further improve the strength, elongation and toughness of the composite material.

[0030] The residual aluminum-containing intermetallic compound layered composite material provided by the present application comprises a plurality of Ti-6Al-4V layers, aluminum layers and intermetallic compound layers. A large number of heterogeneous interfaces between the layers can significantly deviate the crack propagation path and consume crack propagation energy, thereby achieving the effect of enhancing the toughness of the material. By introducing a residual aluminum layer between the Ti-6Al-4V layer and the intermetallic compound layer, the present application greatly improves the elongation of the composite material while achieving high strength, thereby providing an innovative design approach and feasible technical means for realizing the strengthening and toughening design of the composite material.

[0031] The present application provides a preparation method of the residual aluminum-containing intermetallic compound layered composite material described in the above technical solution, comprising the following steps:

[0032] (1) Alternately stack TC4 foils and Al foils from bottom to top to obtain a composite material;

[0033] (2) Vacuum hot-press the composite material obtained in step (1) to obtain a residual aluminum-containing intermetallic compound layered composite material.

[0034] The present application alternately stacks TC4 foils and Al foils from bottom to top to obtain a composite material.

[0035] In the present application, the material of the TC4 foil is preferably Ti-6Al-4V; the thickness of the TC4 foil is preferably 140-160 μm, more preferably 150 μm; the material of the Al foil is preferably industrial pure aluminum, more preferably 1060 Al; and the thickness of the Al foil is preferably 140-160 μm, more preferably 150 μm. The present application does not have special limitations on the length and width of the TC4 foil and the Al foil, which can be determined according to the size of the desired composite material. The present application does not have special limitations on the specific source of the TC4 foil and the Al foil, and commercially available products known to those skilled in the art can be used. The use of the above-mentioned raw materials to prepare the composite material has a wide source and is non-toxic and environmentally friendly, and at the same time, the preparation of the composite material can be carried out at a relatively low temperature, which has a relatively low energy consumption, a relatively low cost, a simple and efficient preparation process and no pollution; by controlling the thickness of the TC4 foil and the Al foil, the thickness of the TC4 layer, the Al layer and the intermetallic compound layer in the Ti / Al3Ti intermetallic compound layered composite material can be controlled.

[0036] Before being alternately stacked, the present application preferably cleans the TC4 foil and the Al foil. In the present application, the cleaning method is preferably as follows: the TC4 foil and the Al foil are immersed in a mixed solution containing 5 vol% hydrofluoric acid and 5 vol% sodium hydroxide for 30 s, then ultrasonically cleaned in ethanol for 5 min, and finally dried. The above-mentioned process can remove the surface contaminants and oxides of the TC4 foil and the Al foil.

[0037] In the present application, the TC4 foil and the Al foil are alternately stacked from bottom to top, preferably TC4 foil-Al foil-TC4 foil-…-Al foil-TC4 foil. By alternately stacking the TC4 foil and the Al foil, the present application can ensure that the TC4 foil is located on both sides of the composite material, thereby ensuring its performance, and intermetallic compound layers can be formed between the TC4 layer and the Al layer during subsequent vacuum hot pressing.

[0038] After obtaining the composite material, the present application hot-presses the composite material in vacuum to obtain an intermetallic compound layered composite material containing residual aluminum. In the present application, the composite material is a Ti / Al3Ti intermetallic compound layered composite material containing residual aluminum.

[0039] The present application does not have special limitations on the equipment used for vacuum hot pressing, and commercially available equipment known to those skilled in the art can be used.

[0040] In the present application, the vacuum degree of the vacuum hot pressing is preferably ≤10 -3 Pa. By controlling the vacuum degree of the vacuum hot pressing, the present application can remove most of the air, thereby avoiding the introduction of impurities such as oxygen during the hot pressing process.

[0041] In the present application, the operation of the vacuum hot pressing is preferably: heating to 500-550℃ at a temperature rising rate of 5-8℃ / min under a pressure of 3-5MPa and keeping the temperature and pressure for 90-180min, then reducing the pressure to 2-2.5MPa, subsequently increasing the temperature to 600-655℃ and keeping the temperature and pressure for 180-240min, then adjusting the temperature to 400-450℃, reducing the pressure to 1-1.5MPa, and keeping the temperature and pressure for 60-120min, and finally cooling to room temperature with the furnace; more preferably: heating to 550℃ at a temperature rising rate of 5℃ / min under a pressure of 4MPa and keeping the temperature and pressure for 120min, then reducing the pressure to 2.4MPa, subsequently increasing the temperature to 610-650℃ and keeping the temperature and pressure for 200min, then adjusting the temperature to 450℃, reducing the pressure to 1.2MPa, and keeping the temperature and pressure for 90min, and finally cooling to room temperature with the furnace. By controlling the specific operation of the vacuum hot pressing, the present application can ingeniously introduce a residual aluminum layer between the Ti-6Al-4V layer and the intermetallic compound layer, and by keeping the temperature and pressure in the range of 600-655℃ and adjusting the temperature, the residual aluminum content in the composite material can be adjusted, so that high strength is obtained while the elongation of the composite material is greatly improved.

[0042] The raw material Ti-6Al-4V foil and Al foil used in the present application are widely sourced, non-toxic and environmentally friendly, the preparation process is carried out in a vacuum hot pressing furnace at a relatively low temperature, and the cost and energy consumption are relatively low, the preparation process is simple, efficient and pollution-free.

[0043] The present application also provides the application of the residual aluminum-containing intermetallic compound layered composite material described in the above technical solution or the residual aluminum-containing intermetallic compound layered composite material prepared by the preparation method described in the above technical solution in the field of aerospace and armored protection.

[0044] The present application does not have special limitations on the specific mode of application of the residual aluminum-containing intermetallic compound layered composite material in the field of aerospace and armored protection, and any application mode known to those skilled in the art can be used.

[0045] The technical solutions in the present application will be described clearly and completely in combination with the embodiments in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0046] Example 1

[0047] A layered composite material containing residual aluminum intermetallic compounds is composed of 8 TC4 layers, 7 Al layers, and 14 intermetallic compound layers; wherein the TC4 layers are Ti-6Al-4V layers; and the intermetallic compound layers are Al3Ti layers.

[0048] The TC4 layer and Al layer are arranged alternately, and the intermetallic compound layer is located between the TC4 layer and the Al layer; the thickness of the TC4 layer is independently 129.5 μm; the thickness of the Al layer is independently 119.4 μm; and the thickness of the intermetallic compound layer is independently 23.2 μm.

[0049] The preparation method of the intermetallic compound layered composite material containing residual aluminum specifically includes the following steps:

[0050] (1) Immerse TC4 foil and Al foil in a mixed solution containing 5 vol% hydrofluoric acid and 5 vol% sodium hydroxide for 30 s, then ultrasonically clean in ethanol for 5 min, and finally dry; then stack TC4 foil and Al foil alternately from bottom to top to obtain a composite material; the material of TC4 foil is Ti-6Al-4V; the thickness of TC4 foil is 150 μm; the material of Al foil is 1060Al; the thickness of Al foil is 150 μm; the alternating stacking of TC4 foil and Al foil from bottom to top is TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-TC4 foil-Al foil-TC4 foil-TC4 foil-Al foil-TC4 foil-TC4 foil-Al foil-TC4 foil-TC4 foil-Al foil-TC4 foil-TC4 foil-Al foil-TC4 foil-TC4 foil;

[0051] (2) The composite material obtained in step (1) is subjected to vacuum hot pressing to obtain a layered composite material containing residual aluminum intermetallic compounds; the vacuum degree of the vacuum hot pressing is 10. -3 Pa; The vacuum hot pressing operation is as follows: under a pressure of 4 MPa, the temperature is increased to 550°C at a heating rate of 5°C / min and held at the temperature and pressure for 120 min. Then the pressure is reduced to 2.4 MPa, the temperature is increased to 600°C and held at the temperature and pressure for 200 min. Next, the temperature is adjusted to 450°C, the pressure is reduced to 1.2 MPa and held at the temperature and pressure for 90 min. Finally, the furnace is cooled to room temperature.

[0052] A schematic diagram of the intermetallic compound layered composite material containing residual aluminum prepared in Example 1 is shown below. Figure 1 As shown. By Figure 1 As can be seen, in the composite material provided by the present invention, the Ti-6Al-4V layer and the Al layer are arranged alternately, while the intermetallic compound layer Al3Ti is located between the Ti-6Al-4V layer and the Al layer.

[0053] The temperature and pressure of vacuum hot pressing in the preparation of the intermetallic compound layered composite material containing residual aluminum in Example 1 change with time as shown in Figure 2 .

[0054] The intermetallic compound layered composite material containing residual aluminum provided in Example 1 was observed by a scanning electron microscope, and the cross-sectional SEM micrograph obtained is shown in Figure 3 . Figure 3 It can be seen that the Ti-6Al-4V layer, the aluminum layer and the intermetallic compound layer in the composite material are tightly combined, and the thickness of the layers is uniform. In addition, the thickness of the Ti-6Al-4V layer, the aluminum layer and the intermetallic compound layer is 129.5 μm, 119.4 μm and 23.2 μm, respectively.

[0055] The mechanical properties of the composite material provided in Example 1 were tested, and the test method was as follows: the tensile test referred to “GB / T 228.1-2021 Metal Materials, Tensile Test, Part 1: Room Temperature Test Method”. The axial tensile displacement loading rate was 0.2 mm / min, the tensile strength perpendicular to the lamination direction was 601 MPa, and the ultimate strain was 4.6%, which significantly improved the comprehensive mechanical properties compared with the composite material provided by the prior art.

[0056] Example 2

[0057] An intermetallic compound layered composite material containing residual aluminum, which is composed of 8 TC4 layers, 7 Al layers and 14 intermetallic compound layers; the TC4 layer is a Ti-6Al-4V layer; the intermetallic compound layer is an Al3Ti layer;

[0058] The TC4 layer and the Al layer are arranged alternately, and the intermetallic compound layer is located in the middle of the TC4 layer and the Al layer; the thickness of the TC4 layer is independently 124.8 μm; the thickness of the Al layer is independently 80.7 μm; and the thickness of the intermetallic compound layer is independently 47.8 μm;

[0059] The preparation method of the intermetallic compound layered composite material containing residual aluminum, specifically comprising the following steps:

[0060] (1) Immerse TC4 foil and Al foil in a mixed solution containing 5 vol% hydrofluoric acid and 5 vol% sodium hydroxide for 30 s, then ultrasonically clean in ethanol for 5 min, and finally dry; then stack TC4 foil and Al foil alternately from bottom to top to obtain a composite material; the material of TC4 foil is Ti-6Al-4V; the thickness of TC4 foil is 150 μm; the material of Al foil is 1060Al; the thickness of Al foil is 150 μm; the alternating stacking of TC4 foil and Al foil from bottom to top is TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-TC4 foil-Al foil-TC4 foil-Al foil-TC4 foil-TC4 foil-Al foil-TC4 foil-TC4 foil-Al foil-TC4 foil-TC4 foil-Al foil-TC4 foil-TC4 foil-Al foil-TC4 foil-TC4 foil-Al foil-TC4 foil-TC4 foil;

[0061] (2) The composite material obtained in step (1) is subjected to vacuum hot pressing to obtain a layered composite material containing residual aluminum intermetallic compounds; the vacuum degree of the vacuum hot pressing is 10. -3 Pa; The vacuum hot pressing operation is as follows: under a pressure of 4 MPa, the temperature is increased to 550°C at a heating rate of 5°C / min and held at the temperature and pressure for 120 min. Then the pressure is reduced to 2.4 MPa, the temperature is increased to 610°C and held at the temperature and pressure for 200 min. Next, the temperature is adjusted to 450°C, the pressure is reduced to 1.2 MPa and held at the temperature and pressure for 90 min. Finally, the furnace is cooled to room temperature.

[0062] A schematic diagram of the structure of the intermetallic compound layered composite material containing residual aluminum prepared in Example 2 is shown below. Figure 1 As shown. By Figure 1 As can be seen, in the composite material provided by the present invention, the Ti-6Al-4V layer and the Al layer are arranged alternately, while the intermetallic compound layer is located between the Ti-6Al-4V layer and the Al layer.

[0063] Example 2: The temperature and pressure variations over time during vacuum hot pressing in the preparation of intermetallic compound layered composite materials containing residual aluminum are shown in the figure. Figure 4 As shown.

[0064] The intermetallic compound layered composite material containing residual aluminum provided in Example 2 was observed using a scanning electron microscope. The obtained cross-sectional SEM microimage is shown below. Figure 5 As shown. By Figure 5 It can be seen that the Ti-6Al-4V layer, aluminum layer, and intermetallic compound layer in the composite material are tightly bonded and have uniform thickness. Furthermore, the thicknesses of the Ti-6Al-4V layer, aluminum layer, and intermetallic compound layer are 124.8 μm, 80.7 μm, and 47.8 μm, respectively.

[0065] As can be seen from the comparison between Example 1 and Example 2, by adjusting the temperature in the range of 600-655℃ during the vacuum hot pressing process, the residual aluminum content in the composite material can be controlled, thereby greatly improving the elongation of the composite material while obtaining high strength.

[0066] The mechanical properties of the composite material provided by Example 2 were tested, and the test method was the same as that of Example 1. The axial tensile displacement loading rate was 0.2 mm / min, the tensile strength perpendicular to the lamination direction was 640 MPa, and the ultimate strain was 3.6%. Compared with the composite material in the prior art, the comprehensive mechanical properties were significantly improved.

[0067] Comparative Example 1

[0068] A method for preparing a Ti / Al3Ti intermetallic compound layered composite material without residual Al, from Lyu et al. (Lyu S, Sun Y, et al., Effect of layer sequence on the mechanical properties of Ti / TiAl laminates [J]. Materials & Design, 2018, 143: 160-168.), specifically comprising the following steps:

[0069] (1) First, remove the surface oxide layer of the Ti foil and the Al foil, then rinse with acetone solution for 30 min, then stack the Ti foil and the Al foil alternately from bottom to top to obtain a composite material; the thickness of the Ti foil is 90 μm; the material of the Al foil is 1060 Al; the thickness of the Al foil is 27 μm; the number of layers of the Ti foil is 50, and the number of layers of the Al foil is 49; the Ti foil and the Al foil are stacked alternately from bottom to top as Ti foil-Al foil-Ti foil-Al foil-Ti foil-......-Al foil-Ti foil;

[0070] (2) The composite material obtained in step (1) is pre-sintered at 50 MPa pressure and 500℃ for 30 min, then pretreated at 900℃ without pressure for 30 min to make Al completely consumed, and finally kept at 50 MPa and 1000℃ for 60 min, thereby obtaining a Ti / Al3Ti intermetallic compound layered composite material without residual Al.

[0071] The Ti / Al3Ti intermetallic compound layered composite material prepared in Comparative Example 1 was observed, and it was found that the single-layer thickness of the Ti foil in the composite material was 65 μm, and the single-layer thickness of the Al3Ti intermetallic layer was 23 μm. The mechanical properties of the composite material were tested, and the axial tensile displacement loading rate was 0.2 mm / min. The results showed that the tensile strength of the composite material perpendicular to the lamination direction was 752 MPa, and the ultimate strain was 3.3%. Compared with Example 1, it was found that the intermetallic compound layered composite material containing residual aluminum obtained in Example 1 had a tensile strength decreased due to the presence of residual Al, but the tensile strength was only reduced by 25%. However, the ultimate strain of the composite material was increased by 39%. Therefore, the comprehensive mechanical properties of Example 1 were obviously improved compared with Comparative Example 1.

[0072] Comparative Example 2

[0073] In step (1), the thickness of the Ti foil was 90 μm, and the thickness of the Al foil was 54 μm. The other conditions were the same as in Comparative Example 1.

[0074] The Ti / Al3Ti intermetallic compound layered composite material prepared in Comparative Example 2 was observed, and it was found that the single-layer thickness of the Ti foil in the composite material was 63 μm, and the single-layer thickness of the Al3Ti intermetallic layer was 49 μm. The mechanical properties of the composite material were tested, and the axial tensile displacement loading rate was 0.2 mm / min. The results showed that the tensile strength of the composite material was 606 MPa, and the ultimate strain was 1.8%. Compared with Example 2, the tensile strength and the ultimate strain of the composite material provided in Comparative Example 2 were obviously lower than those of Example 2, which indicated that the technical scheme of the present application could significantly improve the comprehensive performance of the composite material.

[0075] The above only describes the preferred embodiments of the present application. It should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the scope of protection of the present application.

Claims

1. A layered composite material containing residual aluminum intermetallic compounds, comprising n TC4 layers, n-1 Al layers, and 2n-2 intermetallic compound layers; The TC4 layer and the Al layer are arranged alternately, and the intermetallic compound layer is located between the TC4 layer and the Al layer; The n is a natural number ≥ 3; The TC4 layer is a Ti-6Al-4V layer; The intermetallic compound layer is an Al3Ti layer; The thickness of the TC4 layer is independently 105.8~129.5 μm, the thickness of the Al layer is independently 33.1~119.4 μm, and the thickness of the intermetallic compound layer is independently 23.2~86.2 μm.

2. The intermetallic compound layered composite material containing residual aluminum according to claim 1, characterized in that, The total thickness of the intermetallic compound layered composite material containing residual aluminum is 1.5~3 mm.

3. A method for preparing the intermetallic compound layered composite material containing residual aluminum as described in any one of claims 1 to 2, comprising the following steps: (1) TC4 foil and Al foil are stacked alternately from bottom to top to obtain a composite material; (2) The composite material obtained in step (1) is subjected to vacuum hot pressing to obtain a layered composite material containing residual aluminum intermetallic compound.

4. The preparation method according to claim 3, characterized in that, The vacuum degree of the vacuum hot pressing in step (2) is ≤10. -3 Pa.

5. The preparation method according to claim 3, characterized in that, The vacuum hot pressing operation in step (2) is as follows: under a pressure of 3~5MPa, the temperature is raised to 500~550℃ at a heating rate of 5~8℃ / min and held at the temperature and pressure for 90~180min. Then the pressure is reduced to 2~2.5MPa, the temperature is raised to 600~655℃ and held at the temperature and pressure for 180~240min. Then the temperature is adjusted to 400~450℃, the pressure is reduced to 1~1.5MPa and held at the temperature and pressure for 60~120min. Finally, the furnace is cooled to room temperature.

6. The application of the intermetallic compound layered composite material containing residual aluminum as described in any one of claims 1 to 2, or the intermetallic compound layered composite material containing residual aluminum prepared by the preparation method described in any one of claims 3 to 5, in the fields of aerospace and armor protection.

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