Aluminum alloy rod having a gradient-strengthened composite structure

Abstract

This utility model relates to the field of metal material processing technology, and in particular to an aluminum alloy rod with a gradient-strengthened composite structure. The rod includes a main body comprising a core support layer, a toughening intermediate layer, and a strengthening outer layer arranged sequentially from the inside out. The core support layer has a honeycomb-shaped reinforcing skeleton composed of interconnected hexagonal prisms. The toughening intermediate layer covers the outer surface of the core support layer and includes an aluminum alloy matrix and toughening reinforcing particles. The toughening reinforcing particles are generally microspheres, disposed within the aluminum alloy matrix, and are arranged in multiples. The toughening reinforcing particles are uniformly gradient-distributed radially from the core support layer to the strengthening outer layer, with a volume fraction increasing from 5% to 15%. The surface of the strengthening outer layer also has a texture. This utility model achieves a synergistic improvement in high strength, high toughness, and wear resistance through multi-layer structural design and optimized material gradient distribution.

Description

Technical Field

[0001] This utility model relates to the field of metal material processing technology, and in particular to an aluminum alloy rod with a gradient-strengthened composite structure. Background Technology

[0002] With increasingly stringent requirements for material performance, traditional homogeneous aluminum alloys are struggling to meet the demands of complex operating conditions. Especially in applications requiring high loads, good toughness, and wear resistance simultaneously, single-structure aluminum alloys often fail to satisfy all performance requirements. First, simply increasing strength often leads to a decrease in toughness, while enhancing wear resistance increases material weight. Second, multi-layered composite aluminum alloy bars suffer from insufficient interlayer bonding and discontinuous performance transitions, making it difficult to meet the stringent comprehensive performance requirements of aerospace, high-end machinery manufacturing, and other fields. Therefore, there is an urgent need to develop an aluminum alloy bar structure that can achieve a gradient distribution of performance, improve interlayer bonding, and optimize comprehensive mechanical properties. Utility Model Content

[0003] To address some of the problems existing in the prior art, this utility model provides an aluminum alloy rod with a gradient-strengthened composite structure. Through multi-layer structural design and optimized material gradient distribution, this aluminum alloy rod achieves a synergistic improvement in high strength, high toughness, and wear resistance, exhibiting excellent comprehensive mechanical properties and broad industrial application prospects.

[0004] To achieve the above objectives, this utility model provides an aluminum alloy rod with a gradient-strengthened composite structure, comprising a rod body, the rod body comprising a core bearing layer, a toughening intermediate layer, and a strengthening outer layer arranged sequentially from the inside out; the core bearing layer is provided with a honeycomb-shaped reinforcing skeleton, the reinforcing skeleton being composed of interconnected hexagonal prisms; the toughening intermediate layer covers the outer surface of the core bearing layer, the toughening intermediate layer comprising an aluminum alloy matrix and toughening reinforcing particles; the toughening reinforcing particles are generally microspheres, the toughening reinforcing particles are disposed within the aluminum alloy matrix and are arranged in multiples; the toughening reinforcing particles are uniformly gradient-distributed radially from the core bearing layer to the strengthening outer layer, with the volume fraction increasing from 5% to 15%; the surface of the strengthening outer layer is also provided with a texture.

[0005] In operation, the core load-bearing layer of the bar body bears the main load through its internal honeycomb-shaped reinforcing skeleton. This reinforcing skeleton is composed of interconnected hexagonal prisms. Micropores on the sidewalls of the prisms reduce the weight of the core load-bearing layer while enhancing its bonding with the outer toughening intermediate layer. Microspherical toughening reinforcing particles are distributed within the aluminum alloy matrix of the toughening intermediate layer. These particles are uniformly gradient-distributed radially from the core load-bearing layer to the reinforced outer layer, with a volume fraction increasing from 5% to 15%. This ensures a continuous transition of toughness from the inside to the outside of the bar, adapting to different working conditions. Force variation; the regularly arranged groove texture on the surface of the reinforced outer layer and the wear-resistant coating on its inner side can improve the wear resistance of the bar surface. The spirally distributed glass fiber bundles in the layer form a three-dimensional crack-resistant network, which enhances the tensile strength and fatigue resistance of the bar. The wavy transition layer between the core load-bearing layer and the tough intermediate layer, and between the tough intermediate layer and the reinforced outer layer, coordinates the strain of each layer through periodic deformation, avoids stress concentration caused by right angle transition, further strengthens the bonding force between each layer, and finally realizes the gradient transfer of load and energy dissipation, ensuring the stability and reliability of the overall performance of the bar.

[0006] The beneficial effects of this utility model are as follows: The honeycomb-shaped reinforcing skeleton of the core bearing layer not only reduces the weight of the rod but also enhances the bonding force with the toughness intermediate layer through the micropores on the sidewalls of the column; the microspherical toughness-enhancing particles in the toughness intermediate layer are distributed radially with increasing volume fraction, enabling a continuous transition of toughness from the core to the outer surface of the rod, effectively improving the overall impact resistance; the regular groove texture and wear-resistant coating of the reinforced outer surface layer improve surface wear resistance, while the spirally distributed glass fiber bundles enhance tensile strength and fatigue resistance; the wavy transition layer between layers, through specific peak height and wavelength design, further strengthens the interlayer bonding force and avoids delamination.

[0007] As a further improvement of this utility model, in order to optimize the thickness ratio of each layer and balance the material performance and lightweight requirements, the thickness ratio of the core bearing layer, the tough intermediate layer and the reinforced outer layer is 5:3:2.

[0008] As a further improvement of this utility model, in order to achieve a balance between lightweight and strength, both reducing the weight of the core and enhancing the mechanical bonding force with the tough intermediate layer; the wall thickness of the hexagonal prisms in the reinforcing skeleton is 0.05mm to 0.2mm, and the center distance between adjacent prisms is 0.3mm to 1mm; a number of micropores are opened on the sidewalls of the hexagonal prisms, and the diameter of the micropores is 0.01mm to 0.05mm, which are used to reduce the weight of the core load-bearing layer while enhancing its bonding force with the tough intermediate layer.

[0009] As a further improvement of this utility model, in order to increase the contact area with the aluminum alloy matrix, improve the interfacial bonding strength, avoid stress concentration caused by traditional particle reinforcement, and enhance the overall toughness of the material, the toughness-enhancing particles are thermoplastic elastomers, and the surface of the toughness-enhancing particles is uniformly provided with several protrusions to increase the contact area with the aluminum alloy matrix.

[0010] As a further improvement of this utility model, in order to achieve synergistic reinforcement of texture and coating, improve wear resistance and extend service life, the texture is a regularly arranged groove with a depth of 0.1mm to 0.5mm; the inner surface of the groove is also coated with a wear-resistant coating with a thickness of 0.02mm to 0.1mm.

[0011] As a further improvement of this utility model, in order to enhance the overall tensile strength and fatigue resistance, a number of fiber bundles are uniformly embedded in the reinforced outer layer, and the fiber bundles are distributed in a spiral shape; the fiber bundles are glass fibers with a diameter of 0.1mm to 0.5mm and a winding pitch of 1mm to 5mm.

[0012] As a further improvement of this utility model, in order to absorb interlayer stress through periodic deformation, avoid stress concentration caused by right-angle transitions, significantly improve the fatigue life of the composite structure, strengthen the interlayer bonding force, and prevent delamination, a transition layer is provided between the core bearing layer and the tough intermediate layer, and between the tough intermediate layer and the reinforced outer layer. The transition layer is wavy. The peak height of the transition layer is 0.05 mm to 0.2 mm, and the wavelength is 0.2 mm to 0.8 mm. Attached Figure Description

[0013] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings:

[0014] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model.

[0015] The structure consists of: 1 core bearing layer, 11 reinforcing skeleton, 2 toughness intermediate layer, 21 aluminum alloy matrix, 22 toughness reinforcing particles, 3 reinforced outer layer, 31 texture, 32 fiber bundle, and 4 transition layer. Detailed Implementation

[0016] like Figure 1The aluminum alloy rod shown has a gradient-strengthened composite structure and includes a rod body. The rod body includes a core bearing layer 1, a toughening intermediate layer 2, and a strengthening outer layer 3 arranged sequentially from the inside out. The core bearing layer 1 is provided with a honeycomb-shaped reinforcing skeleton 11, which is composed of interconnected hexagonal prisms. The toughening intermediate layer 2 covers the outer surface of the core bearing layer 1 and includes an aluminum alloy matrix 21 and toughening reinforcing particles 22. The toughening reinforcing particles 22 are generally microspheres. The toughness-enhancing particles 22 are disposed within the aluminum alloy matrix 21, and a plurality of such particles are disposed therein. The toughness-enhancing particles 22 are uniformly distributed in a gradient from the core bearing layer 1 to the reinforced outer surface layer 3 in a radial direction, with the volume fraction increasing from 5% to 15%. The surface of the reinforced outer surface layer 3 is also provided with a texture 31. The thickness ratio of the core bearing layer 1, the toughness intermediate layer 2, and the reinforced outer surface layer 3 is 5:3:2. The wall thickness of the hexagonal prisms in the reinforcing skeleton 11 is 0.05mm to 0.2mm, and the center-to-center distance between adjacent prisms is 0.3mm to 1mm. mm; the hexagonal prism has several micropores on its sidewalls, the diameter of which is 0.01mm to 0.05mm, used to reduce the weight of the core load-bearing layer 1 while enhancing its bonding force with the tough intermediate layer 2; the toughness-reinforcing particles 22 are thermoplastic elastomers, and the surface of the toughness-reinforcing particles 22 is uniformly provided with several protrusions to increase the contact area with the aluminum alloy substrate 21; the texture 31 is a regularly arranged groove, the depth of which is 0.1mm to 0.5mm; the inner surface of the groove It is also coated with a wear-resistant coating with a thickness of 0.02 mm to 0.1 mm; a plurality of fiber bundles 32 are uniformly embedded in the reinforced outer layer 3, and the fiber bundles 32 are distributed in a spiral shape; the fiber bundles 32 are glass fibers with a diameter of 0.1 mm to 0.5 mm and a winding pitch of 1 mm to 5 mm; a transition layer 4 is provided between the core bearing layer 1 and the tough intermediate layer 2, and between the tough intermediate layer 2 and the reinforced outer layer 3, and the transition layer 4 is wavy; the peak height of the transition layer 4 is 0.05 mm to 0.2 mm, and the wavelength is 0.2 mm to 0.8 mm.

[0017] In operation, the core bearing layer 1 of the main body of the bar bears the main load through its internal honeycomb-shaped reinforcing skeleton 11. The reinforcing skeleton 11 is composed of interconnected hexagonal prisms. The micropores on the sidewalls of the prisms reduce the weight of the core bearing layer 1 while enhancing its bonding force with the outer toughening intermediate layer 2. Microspherical toughening reinforcing particles 22 are distributed within the aluminum alloy matrix 21 of the toughening intermediate layer 2. These particles are uniformly gradient distributed radially from the core bearing layer 1 to the reinforced outer surface layer 3, with the volume fraction increasing from 5% to 15%, so that the toughness of the bar can be continuously transitioned from the inside to the outside to adapt to different working conditions. The stress changes; the regularly arranged groove texture 31 on the surface of the reinforced outer layer 3 and the wear-resistant coating on its inner side can improve the wear resistance of the bar surface; the spirally distributed glass fiber bundles 32 in the layer form a three-dimensional crack-resistant network, which enhances the tensile strength and fatigue resistance of the bar; the wavy transition layer 4 between the core load-bearing layer 1 and the tough intermediate layer 2, and between the tough intermediate layer 2 and the reinforced outer layer 3, coordinates the strain of each layer through periodic deformation, avoids stress concentration caused by right angle transition, further strengthens the bonding force between each layer, and finally realizes the gradient transfer of load and energy dissipation, ensuring the stability and reliability of the overall performance of the bar.

[0018] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An aluminum alloy rod with a gradient-strengthened composite structure, comprising a rod body, characterized in that: The main body of the rod includes a core support layer (1), a tough intermediate layer (2), and a reinforced outer layer (3) arranged sequentially from the inside to the outside; the core support layer (1) is provided with a honeycomb-shaped reinforcing skeleton (11), which is composed of interconnected hexagonal prisms; the tough intermediate layer (2) covers the outer surface of the core support layer (1), and the tough intermediate layer (2) includes an aluminum alloy matrix (21) and toughening reinforcing particles (22); the toughening reinforcing particles (22) are generally microspheres, and are arranged in the aluminum alloy matrix (21) and there are several of them; the toughening reinforcing particles (22) are evenly gradient distributed from the core support layer (1) to the reinforced outer layer (3) in the radial direction, and the volume fraction increases from 5% to 15%; the surface of the reinforced outer layer (3) is also provided with a texture (31).

2. The aluminum alloy rod with a gradient-strengthened composite structure according to claim 1, characterized in that: The thickness ratio of the core bearing layer (1), the tough intermediate layer (2), and the reinforced outer layer (3) is 5:3:

2.

3. The aluminum alloy rod with a gradient-strengthened composite structure according to claim 1, characterized in that: The wall thickness of the hexagonal prisms in the reinforcing skeleton (11) is 0.05mm to 0.2mm, and the center distance between adjacent prisms is 0.3mm to 1mm. Several micro-holes are provided on the sidewalls of the hexagonal prisms, and the diameter of the micro-holes is 0.01mm to 0.05mm, which are used to reduce the weight of the core bearing layer (1) while enhancing its bonding force with the tough intermediate layer (2).

4. The aluminum alloy rod with a gradient-strengthened composite structure according to claim 1, characterized in that: The toughness-enhancing particles (22) are thermoplastic elastomers, and the surface of the toughness-enhancing particles (22) is uniformly provided with several protrusions to increase the contact area with the aluminum alloy matrix (21).

5. The aluminum alloy rod with a gradient-strengthened composite structure according to claim 1, characterized in that: The texture (31) is a regularly arranged groove with a depth of 0.1mm to 0.5mm; the inner surface of the groove is also coated with a wear-resistant coating with a thickness of 0.02mm to 0.1mm.

6. The aluminum alloy rod with a gradient-strengthened composite structure according to claim 1, characterized in that: The reinforced outer layer (3) is also uniformly embedded with a number of fiber bundles (32), which are distributed in a spiral shape; the fiber bundles (32) are glass fibers with a diameter of 0.1 mm to 0.5 mm and a winding pitch of 1 mm to 5 mm.

7. The aluminum alloy rod with a gradient-strengthened composite structure according to claim 1, characterized in that: A transition layer (4) is provided between the core bearing layer (1) and the tough intermediate layer (2), and between the tough intermediate layer (2) and the reinforced outer surface layer (3). The transition layer (4) is wavy. The peak height of the transition layer (4) is 0.05 mm to 0.2 mm, and the wavelength is 0.2 mm to 0.8 mm.

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