Titanium / aluminum dissimilar alloy material and method for manufacturing the same

Abstract

The application relates to the technical field of metal processing, in particular to a titanium / aluminum dissimilar alloy material and a preparation method thereof. The titanium / aluminum dissimilar alloy material comprises one or more titanium alloy layers, one or more interlaced layers and one or more aluminum alloy layers which are sequentially stacked; each interlaced layer is alternately composed of two or more strip-shaped materials selected from titanium alloy, aluminum alloy and transition material, and the edges of the two adjacent strip-shaped materials are flush with each other; the transition material is selected from metal elements and alloy materials; and the width of each strip-shaped material accounts for 2-7% of the total width of the interlaced layer. The titanium / aluminum dissimilar alloy material can solve the problems of poor mechanical properties and a large number of intermetallic compounds in the interface of the current titanium / aluminum dissimilar metal joint.

Description

Technical Field

[0001] This invention relates to the field of metal processing technology, and in particular to a titanium / aluminum dissimilar alloy material and its preparation method. Background Technology

[0002] In the fields of aviation, aerospace, and automotive, lightweight structures have become a development trend in recent years, and are of great significance for energy conservation, emission reduction, and sustainable development. Replacing titanium alloys with high-strength aluminum alloys can significantly reduce structural weight; however, some components that need to withstand high temperatures still must be manufactured using titanium alloys or high-temperature alloys. Titanium / aluminum dissimilar alloys can fully leverage the advantages of both alloys while compensating for their respective disadvantages, making them significant for energy conservation, emission reduction, and improving the performance of key aerospace components, with broad application prospects.

[0003] In recent years, the preparation of titanium / aluminum dissimilar alloy materials has mainly relied on laser welding, electron beam welding, friction stir welding, and arc additive manufacturing. However, the formation of intermetallic compounds and cracking caused by interfacial stress are common problems in the additive manufacturing / welding of titanium / aluminum dissimilar materials.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] Currently, existing technologies for bonding dissimilar metal materials mainly address the issue by adjusting energy input, compositional gradient transitions, and interlayers to reduce the formation of intermetallic compounds to some extent. However, these methods still cannot completely prevent interface cracking, making it difficult to fabricate large and complex titanium / aluminum dissimilar material structures. This invention discovers that by controlling the area ratio of different materials in the interlayer, ensuring that the upper and lower titanium / aluminum dissimilar alloy materials have area contact with the interlayer using the same metal, it is possible to solve the problems of poor mechanical properties and easy interface cracking in current titanium / aluminum dissimilar metal joints. Simultaneously, it can significantly reduce intermetallic compounds at the titanium / aluminum interface, exhibiting high controllability.

[0006] Specifically, the present invention provides the following technical solutions:

[0007] The present invention first provides a titanium / aluminum dissimilar alloy material, comprising: 1) one or more titanium alloy layers; 2) one or more interwoven layers; 3) one or more aluminum alloy layers; each interwoven layer is composed of two or more strip-shaped materials selected from titanium alloy, aluminum alloy and transition materials, which are bonded together alternately, and the edges of two adjacent strip-shaped materials are flush with each other;

[0008] The transition material is selected from elemental metals and alloys;

[0009] In each of the interlacing layers, the width of each strip material accounts for 2 to 7% of the total width of the interlacing layer.

[0010] The present invention has found that when the above-mentioned interwoven layer is set as an intermediate layer between the titanium alloy layer and the aluminum alloy layer, the intermetallic compounds at the interface can be effectively reduced, and the generation of cracks can be avoided during the preparation of titanium / aluminum dissimilar alloy materials.

[0011] Preferably, the transition material is a high-entropy alloy, copper, niobium, nickel, nickel-based alloy, or copper-based alloy.

[0012] Preferably, each titanium alloy layer is composed of at least two strip-shaped titanium alloy materials that are bonded together, and the edges of two adjacent strip-shaped materials are flush with each other;

[0013] Each aluminum alloy layer is composed of at least two bonded strips of aluminum alloy, with the edges of two adjacent strips being flush with each other.

[0014] In the titanium / aluminum dissimilar alloy material, the angle between any two adjacent strip materials in the horizontal direction is 30 to 90°; more preferably, the bonding effect is better when the angle is 60 to 90°.

[0015] In this invention, those skilled in the art can make corresponding settings according to the actual method. For example, when using laser deposition, the included angle is the included angle of the interlayer deposition direction or the printing path.

[0016] Preferably, the total height of the interwoven layers (one or more) is 0.6 to 1.2 mm, and the total height of the aluminum alloy layers (one or more) is 0.8 to 1.2 mm.

[0017] Preferably, the ratio of the number of interwoven layers to the number of aluminum alloy layers is 1:2 to 10.

[0018] Preferably, the titanium / aluminum dissimilar alloy material comprises, in sequence,: 1) one or more titanium alloy layers; 2) one to six interwoven layers; and 3) one to twenty aluminum alloy layers, wherein the number of aluminum alloy layers is greater than or equal to the number of interwoven layers.

[0019] More preferably, the number of aluminum alloy layers is greater than that of the interlaced layers, and the number of aluminum alloy layers is 4 to 10.

[0020] Preferably, the laminated structure further includes a pure transition material layer, which is distributed between the interwoven layers and the aluminum alloy layer, between the interwoven layers and the titanium alloy layer, or between the interwoven layers. A schematic diagram of the fabrication process for the pure transition material layer distributed between the interwoven layers is shown below. Figure 2 .

[0021] The present invention further provides a method for preparing the titanium / aluminum dissimilar alloy material, comprising: using laser metal deposition additive manufacturing to produce the titanium / aluminum dissimilar alloy material.

[0022] Laser metal deposition (LMD) is an advanced manufacturing technology that has emerged in recent years. It can directly and rapidly form parts of any shape and size, effectively reducing processing costs and shortening production cycles. However, based on its principle of "layered manufacturing and discrete stacking," the repeated deposition process in LMD leads to thermal cycling that significantly impacts the interface between dissimilar metals, making it more prone to interface cracking. Therefore, those skilled in the art currently still employ welding techniques with one or two heat inputs.

[0023] This invention discovers that when the interwoven layer is set as an intermediate layer between the titanium alloy layer and the aluminum alloy layer, the influence of the thermal cycle of laser metal deposition on the dissimilar metal interface can be effectively overcome, the mechanical properties are significantly improved, the intermetallic compounds at the interface are greatly reduced, and the generation of cracks during the preparation of titanium / aluminum dissimilar alloy materials can be effectively avoided.

[0024] Preferably, in the titanium alloy layer, the laser deposition power of the titanium alloy powder is 400-600W, and the overlap rate is 40-60%.

[0025] In the aluminum alloy layer, the laser deposition power of the aluminum alloy powder is 400-1000W, and the overlap rate is 40-60%.

[0026] In the interwoven layer, the laser deposition power of titanium alloy powder is 400-600W, the laser deposition power of aluminum alloy powder is 400-600W, the laser deposition power of transition material powder is 400-800W, and the overlap rate of any two materials is 0-5%.

[0027] This invention optimizes laser metal deposition process parameters such as laser deposition power, overlap ratio, and the angle between interlayer deposition directions. This can further reduce the impact of the thermal cycle of laser metal deposition itself on the dissimilar metal interface, enabling flexible and efficient integrated additive manufacturing of titanium / aluminum dissimilar alloy materials with complex shapes and excellent performance.

[0028] Preferably, the titanium alloy powder, transition material powder, and aluminum alloy powder have the same or different particle sizes, each with an independent particle size of 50–150 μm.

[0029] Furthermore, the titanium alloy powder is Ti6Al4V powder; the high-entropy alloy powder is FeCuNiTiAl powder; and the aluminum alloy powder is 2024 powder.

[0030] Preferably, the titanium alloy powder, high-entropy alloy powder, and aluminum alloy powder are pre-dried; wherein the drying temperature is 100-150°C, the vacuum degree is -0.05--0.2MPa, and the time is 1.5-2.5h.

[0031] Preferably, the additively manufactured substrate is a titanium alloy substrate or an aluminum alloy substrate, with a thickness greater than 10 mm; wherein,

[0032] When the substrate for additive manufacturing is a titanium alloy substrate, a titanium alloy layer, a high-entropy alloy layer and an aluminum alloy layer are sequentially additively manufactured on the substrate.

[0033] When the substrate for additive manufacturing is an aluminum alloy substrate, an aluminum alloy layer, a high-entropy alloy layer, and a titanium alloy layer are sequentially additively manufactured on the substrate.

[0034] That is, the substrate material is the same as the material of the metal layer it is in direct contact with.

[0035] Preferably, the substrate is pre-polished with sandpaper and cleaned with acetone 1-3 times; the above-mentioned pretreatment of the substrate can effectively remove impurities such as oxide film on the substrate surface, making the substrate surface smooth and glossy.

[0036] Preferably, the titanium alloy powder, high-entropy alloy powder, and aluminum alloy powder are respectively processed by a powder feeder for additive manufacturing; the carrier gas flow rate of the powder feeder is controlled at 10-15 L / min, and the powder feeding speed is 4-6 g / min.

[0037] In this invention, the laser cladding head can be a coaxial powder feeder or a lateral powder feeder; wherein, the coaxial powder feeder laser cladding head can be a ring-shaped, two-way, three-way, or four-way powder feeder nozzle.

[0038] Preferably, the focal length of the laser is such that the diameter of the laser spot on the substrate is larger than the diameter of the powder convergence point;

[0039] The laser is a fiber laser, a CO2 laser, an Nd:YAG laser, or a semiconductor laser.

[0040] As a preferred technical solution of the present invention, the preparation method includes:

[0041] (1) A three-dimensional model of the target titanium / aluminum dissimilar alloy structure was created to determine the deposition height of the titanium alloy layer, the interlacing layer and the aluminum alloy layer and the deposition path of each layer; a total of 7-28 layer paths were planned, including 1-12 titanium alloy layers, 2-6 interlacing layers and 4-10 aluminum alloy layers. Each layer path was a straight line of 30±2mm, and the spacing between adjacent paths was 1±0.2mm. A reciprocating printing method was adopted.

[0042] (2) Titanium alloy powder, aluminum alloy powder and transition material powder are used as printing raw materials and dried at 100~150℃ and -0.05~-0.2MPa for 1.5~2.5h, and then cooled naturally.

[0043] (3) Select a titanium alloy plate or aluminum alloy plate with the same or similar composition as the metal powder for printing substrate. Polish the substrate with sandpaper and clean it with acetone 1 to 3 times, and fix the substrate on the worktable.

[0044] (4) The powder processed in step (2) is fed into the powder cylinder of the carrier gas powder feeder, the spatial position of the laser cladding head and the substrate is determined, and the powder feeder is set so that the powder convergence point is located on the substrate surface; the carrier gas flow rate of the powder feeder is controlled at 10-15L / min, and the powder feeding speed is 4-6g / min.

[0045] (5) Turn on the laser and focus it so that the diameter of the laser spot on the substrate is slightly larger than the diameter of the powder aggregation point;

[0046] (6) Set the laser additive manufacturing parameters, control the movement of the cladding head, and print layer by layer according to the set deposition path. After completing all layers, the target titanium / aluminum dissimilar alloy structural part is obtained; where:

[0047] In the titanium alloy layer, the laser deposition power of the titanium alloy powder is 400-600W, the overlap rate is 40-60%, and the layer height is 0.6-0.8mm;

[0048] In the aluminum alloy layer, the laser deposition power of the aluminum alloy powder is 500-1000W, the overlap rate is 40-60%, and the layer height is 0.8-1.2mm;

[0049] The printing path angle for each of the titanium alloy layer and the aluminum alloy layer is 30° to 90°.

[0050] In the interwoven layer, the deposition width of the same material in one layer accounts for 2 to 7% of the total width of the interwoven layer, the angle between the deposition directions of different interwoven layers is 30 to 90°, and the layer height of the interwoven layer is 0.8 to 1.2 mm;

[0051] In the interwoven layer, the laser deposition power of titanium alloy powder is 400-600W, the laser deposition power of aluminum alloy powder is 400-600W, the laser deposition power of transition material powder is 400-800W, and the overlap rate of any two materials in the interwoven layer is 0-5%.

[0052] When titanium alloy and aluminum alloy materials are deposited alternately, the layer height is 0.8–1.2 mm; when titanium alloy and high-entropy alloy materials are deposited alternately, the layer height is 0.6–0.8 mm; when aluminum alloy and high-entropy alloy materials are deposited alternately, the layer height is 0.9–1.1 mm.

[0053] (7) After the additive manufacturing is completed, continue to maintain an inert atmosphere environment for 0.3 to 1 hour. After the material has completely cooled down, stop the inert atmosphere protection and then take out the material.

[0054] This invention utilizes the aforementioned laser metal deposition technology to integrally manufacture titanium / aluminum dissimilar alloy materials, enabling the fabrication of complex structures, thereby shortening the production cycle and reducing production costs. Furthermore, by controlling the process parameters of each layer, especially at the interface of the interlacing layers, optimal interface metallurgical quality can be achieved through optimized process parameters. This enables the rapid fabrication of high-performance titanium / aluminum dissimilar alloy materials, which is of great significance for energy conservation, emission reduction, and improving the performance of key aerospace components, and has broad application prospects.

[0055] Based on the above technical solution, the beneficial effects of the present invention are as follows:

[0056] This invention, by setting the interwoven layer as an intermediate layer between titanium alloy and aluminum alloy, greatly reduces the brittle intermetallic compounds formed at the interface during the additive manufacturing of titanium / aluminum dissimilar alloy materials, avoids the generation of cracks during the preparation of titanium / aluminum dissimilar alloy materials, and provides a new approach for the additive manufacturing / joining of dissimilar materials with poor metallurgical compatibility. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of the preparation method of titanium / aluminum dissimilar alloy material according to Example 1 of the present invention; wherein, in each layer of material on the right side of the figure, the dashed arrows represent the printing path of titanium alloy powder, and the solid arrows represent the printing path of aluminum alloy.

[0058] Figure 2 This is a schematic diagram of a process for preparing a titanium / aluminum dissimilar alloy material provided by the present invention. The interlaced layer consists of two layers: the upper layer is formed by alternating deposition of transition material and aluminum alloy, and the lower layer is formed by alternating deposition of transition material and titanium alloy. A transition material layer is present between the interlaced layers. In each material layer on the right side of the diagram, dashed arrows represent the printing path of titanium alloy powder, solid arrows represent the printing path of aluminum alloy, and dotted-dashed arrows represent the printing path of the transition material.

[0059] Figure 3 The image shows a three-dimensional model of the titanium / aluminum dissimilar alloy material prepared in Example 1 (only two layers of aluminum alloy are shown in the figure), where black represents Ti6Al4V titanium alloy and white represents 2024 aluminum alloy;

[0060] Figure 4 Figures showing the results of preparing titanium / aluminum dissimilar alloy materials for Example 1 (Figure a) and Example 2 (Figure b);

[0061] Figure 5 Metallographic microstructure of the titanium / aluminum dissimilar alloy material prepared in Example 2;

[0062] Figure 6 Figure showing the results of preparing titanium / aluminum dissimilar alloy materials for Comparative Example 1;

[0063] Figure 7 Figures showing the results of preparing titanium / aluminum dissimilar alloy materials for Comparative Example 2 (Fig. a) and Comparative Example 3 (Fig. b);

[0064] Figure 1 , 2 Figure labels in the diagram:

[0065] 1: Laser heat source; 2: Aluminum alloy layer; 3: Interwoven layer; 4: Titanium alloy layer; 5: Titanium alloy substrate; 6: Metal powder. Detailed Implementation

[0066] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0067] Where specific techniques or conditions are not specified in the examples, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels. The following examples and comparative examples employ conventional laser metal deposition systems in this field to perform additive manufacturing of the aforementioned titanium / aluminum dissimilar alloy materials.

[0068] Example 1

[0069] This embodiment provides a titanium / aluminum dissimilar alloy material, and its preparation method (e.g.) Figure 1 (As shown) includes the following steps:

[0070] (1) The titanium / aluminum dissimilar alloy material is modeled in three dimensions and layered, with a total of 13 layers planned. Among them, there is 1 layer of titanium alloy powder, 2 layers of interwoven layers, and 10 layers of aluminum alloy powder. Each path is a straight line of 30mm. The deposition width of titanium alloy powder or aluminum alloy powder in each layer of the interwoven layer is 1.5mm. The printing method is reciprocating (i.e., the end point of the previous path is the start point of the next path, and so on). The deposition direction of any two layers of material is 90° apart. The interwoven layer is the alternating deposition of titanium / aluminum in the same layer using a reciprocating printing method.

[0071] (2) The titanium alloy powder is Ti6Al4V powder and the aluminum alloy powder is 2024 powder with a powder diameter of 53-150μm. The titanium alloy powder and aluminum alloy powder are dried at 120℃ and -0.1MPa for 2h and then cooled naturally.

[0072] (3) The substrate is a Ti6Al4V titanium alloy substrate with a size of 200mm×200mm×15mm. The substrate is polished with sandpaper and cleaned with acetone three times, and then fixed on the worktable.

[0073] (4) The titanium alloy powder and aluminum alloy powder are respectively fed into the powder cylinder of the carrier gas powder feeder, the spatial position of the four-way synchronous powder feeding laser cladding head and the substrate is determined, the powder feeder is started and set so that the convergence point of the four powders is located on the substrate surface, the carrier gas flow rate of the powder feeder is controlled at 15L / min, and the powder feeding speed is 5g / min.

[0074] (5) Turn on the laser and focus it so that the diameter of the laser spot on the substrate is 3mm.

[0075] (6) Additive manufacturing is carried out under an inert atmosphere; wherein,

[0076] The laser deposition power of the titanium alloy powder (first layer) is 520W, the movement speed is 15mm / s, the overlap rate is 50%, and the layer height is 0.7mm.

[0077] The laser deposition power of the titanium alloy powder in the interlaced layer (layer 2-3) is 520W, the laser deposition power of the aluminum alloy powder is 480W, the movement speed is 15mm / s, the overlap rate is 0%, and the layer height is 1mm.

[0078] The laser deposition power of the aluminum alloy powder (layers 4-13) is 800W, the movement speed is 15mm / s, the overlap rate is 50%, and the layer height is 1mm.

[0079] (7) After the additive manufacturing is completed, continue to maintain the inert atmosphere environment for 0.5 hours. After the material has completely cooled down, stop the inert atmosphere protection and then take out the material.

[0080] A schematic diagram of the preparation method for the titanium / aluminum dissimilar alloy material is shown below. Figure 1 The three-dimensional model of the prepared titanium / aluminum dissimilar alloy material is shown in [the image]. Figure 3 The resulting images of the prepared titanium / aluminum dissimilar alloy materials are shown below. Figure 4 (Figure a)

[0081] Example 2

[0082] This embodiment provides a titanium / aluminum dissimilar alloy material, the preparation method of which includes the following steps:

[0083] (1) The titanium / aluminum dissimilar alloy material is modeled in three dimensions and layered, with a total of 24 layers planned, including 12 layers of titanium alloy powder, 2 layers of interwoven layers, and 10 layers of aluminum alloy powder. Each path is a straight line of 30 mm. The deposition width of titanium alloy powder or aluminum alloy powder in each layer of the interwoven layer is 1.5 mm. The printing method is reciprocating (i.e., the end point of the previous path is the start point of the next path, and so on). The interwoven layer is formed by the alternating deposition of titanium / aluminum in the same layer using a reciprocating printing method. The deposition direction of the two interwoven layers is 90° apart.

[0084] (2) The titanium alloy powder is Ti6Al4V powder and the aluminum alloy powder is 2024 powder with a powder diameter of 53-150μm. The titanium alloy powder and aluminum alloy powder are dried at 120℃ and -0.1MPa for 2h and then cooled naturally.

[0085] (3) The substrate is a Ti6Al4V titanium alloy substrate with a size of 150mm×150mm×10mm. The substrate is polished with sandpaper and cleaned with acetone three times, and then fixed on the worktable.

[0086] (4) The titanium alloy powder and aluminum alloy powder are respectively fed into the powder cylinder of the carrier gas powder feeder, the spatial position of the four-way synchronous powder feeding laser cladding head and the substrate is determined, the powder feeder is started and set so that the convergence point of the four powders is located on the substrate surface, the carrier gas flow rate of the powder feeder is controlled at 15L / min, and the powder feeding speed is 5g / min.

[0087] (5) Turn on the laser and focus it so that the diameter of the laser spot on the substrate is 3mm.

[0088] (6) Additive manufacturing is carried out under an inert atmosphere; wherein,

[0089] The laser deposition power of the titanium alloy powder (layers 1-12) is 520W, the movement speed is 15mm / s, the overlap rate is 50%, and the layer height is 0.7mm.

[0090] The laser deposition power of the titanium alloy powder in the interlaced layer (layers 13-14) is 520W, the laser deposition power of the aluminum alloy powder is 480W, the movement speed is 15mm / s, the overlap rate is 0%, and the layer height is 1mm.

[0091] The laser deposition power of the aluminum alloy powder (layers 15-24) is 560W, the movement speed is 15mm / s, the overlap rate is 50%, and the layer height is 1mm.

[0092] (7) After the additive manufacturing is completed, continue to maintain the inert atmosphere environment for 0.5 hours. After the material has completely cooled down, stop the inert atmosphere protection and then take out the material.

[0093] The resulting images of the prepared titanium / aluminum dissimilar alloy materials are shown below. Figure 4 (Figure b), metallographic microstructure diagram is shown below. Figure 5 .

[0094] Comparative Example 1

[0095] This comparative example provides a titanium / aluminum dissimilar alloy material, the preparation method of which differs from that of Example 2 in that:

[0096] In step (1), the titanium / aluminum dissimilar alloy material is modeled in three dimensions and layered, with a total of 18 layers planned, including 12 layers of titanium alloy powder and 6 layers of aluminum alloy powder, with no intermediate interlacing layers.

[0097] The resulting images of the prepared titanium / aluminum dissimilar alloy materials are shown below. Figure 6 .according to Figure 6 It is evident that the titanium / aluminum dissimilar alloy material developed severe cracks when the heat input of the aluminum alloy layer was reduced (compared to Example 1) and there were only 6 layers, making it impossible to continue printing and resulting in poor bonding.

[0098] Comparative Example 2

[0099] This comparative example provides a titanium / aluminum dissimilar alloy material, whose layered structure and preparation method are the same as those in Example 2, except that the deposition width (width of the strip material) of the titanium alloy powder or aluminum alloy powder in the interwoven layer is 3 mm.

[0100] The resulting images of the prepared titanium / aluminum dissimilar alloy materials are shown below. Figure 7 (Figure a). According to Figure 7 (Figure a) As can be seen, macroscopic cracks appeared at the interface of the titanium / aluminum dissimilar alloy material, resulting in a poor bonding effect.

[0101] Comparative Example 3

[0102] This comparative example provides a titanium / aluminum dissimilar alloy material, whose stacked structure and preparation method are the same as those in Example 2, except that the deposition width (width of the strip material) of the titanium alloy powder or aluminum alloy powder in the interwoven layer is 6 mm.

[0103] The resulting images of the prepared titanium / aluminum dissimilar alloy materials are shown below. Figure 7 (Figure b). According to Figure 7 (Figure b) As can be seen, the titanium / aluminum dissimilar alloy material exhibits relatively high density at the interface. Figure 7 (Figure a) More obvious macroscopic cracks, poor bonding effect.

[0104] In this invention, when the interwoven layer contains a transition material, or when a pure transition material layer is distributed between the interwoven layer and the aluminum alloy layer, between the interwoven layer and the titanium alloy layer, or between the interwoven layers, no cracks appear at the interface of the prepared titanium / aluminum dissimilar alloy material, and the bonding effect is better than that of the comparative example.

[0105] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A titanium / aluminum dissimilar alloy material, characterized in that, The material comprises, in sequence, the following: 1) one or more titanium alloy layers; 2) two or more interwoven layers; and 3) one or more aluminum alloy layers. Each interwoven layer is composed of alternating strips of materials selected from titanium alloy, aluminum alloy, and transition materials. Each strip is composed of one of titanium alloy, aluminum alloy, and transition materials, and the edges of adjacent strips are flush with each other. The alternating composition means that the interwoven layers are formed by alternating deposition of strips of materials in the same layer using a reciprocating printing method. The transition material is copper, niobium, nickel, high-entropy alloy, nickel-based alloy, or copper-based alloy. In each of the interlacing layers, the width of each strip material accounts for 2-7% of the total width of the interlacing layer; In the titanium / aluminum dissimilar alloy material, the angle between any two adjacent strips of material in the horizontal direction is 30~90°.

2. The titanium / aluminum dissimilar alloy material according to claim 1, characterized in that, Each titanium alloy layer is composed of at least two strip-shaped titanium alloy materials that are bonded together, with the edges of two adjacent strip-shaped materials being flush with each other. Each aluminum alloy layer consists of at least two attached strips of aluminum alloy, with the edges of two adjacent strips flush with each other.

3. The titanium / aluminum dissimilar alloy material according to claim 1 or 2, characterized in that, The total height of the two or more interwoven layers is 0.6 to 1.2 mm, and the total height of the one or more aluminum alloy layers is 0.8 to 1.2 mm.

4. The titanium / aluminum dissimilar alloy material according to claim 1 or 2, characterized in that, The titanium / aluminum dissimilar alloy material comprises, in sequence,: 1) one or more titanium alloy layers; 2) two to six interwoven layers; and 3) four to twenty aluminum alloy layers, wherein the number of aluminum alloy layers is greater than or equal to the number of interwoven layers.

5. The titanium / aluminum dissimilar alloy material according to claim 4, characterized in that, The aluminum alloy layer consists of 4 to 10 layers.

6. The titanium / aluminum dissimilar alloy material according to any one of claims 1, 2, and 5, characterized in that, The stacked structure also contains a pure transition material layer, which is distributed between the interwoven layer and the aluminum alloy layer, between the interwoven layer and the titanium alloy layer, or between the interwoven layers.

7. A method for preparing a titanium / aluminum dissimilar alloy material according to any one of claims 1, 2, and 5, characterized in that, The titanium / aluminum dissimilar alloy material is manufactured using laser metal deposition additive manufacturing.

8. The method for preparing titanium / aluminum dissimilar alloy material according to claim 7, characterized in that, In the titanium alloy layer, the laser deposition power of the titanium alloy powder is 400~600 W, and the overlap rate is 40~60%. In the aluminum alloy layer, the laser deposition power of the aluminum alloy powder is 400~1000 W, and the overlap rate is 40~60%; In the interwoven layer, the laser deposition power of the titanium alloy powder is 400~600 W, the laser deposition power of the aluminum alloy powder is 400~600 W, and the laser deposition power of the transition material powder is 400~800 W.

9. The method for preparing titanium / aluminum dissimilar alloy material according to claim 8, characterized in that, The titanium alloy powder, transition material powder, and aluminum alloy powder have the same or different particle sizes, each independently ranging from 50 to 150 µm.

10. The method for preparing the titanium / aluminum dissimilar alloy material according to claim 8 or 9, characterized in that, The titanium alloy powder, transition material powder, and aluminum alloy powder are pre-dried; wherein the drying temperature is 100~150℃, the vacuum degree is -0.05~-0.2 MPa, and the time is 1.5~2.5 h.

Images