High-strength and high-toughness aluminum alloy conical pipe fitting as well as preparation method and application thereof

Abstract

The invention discloses a high-strength and high-toughness aluminum alloy conical pipe fitting and a preparation method and application thereof, and belongs to the technical field of aluminum alloy deformation machining.The high-strength and high-toughness aluminum alloy conical pipe fitting is prepared by sequentially conducting two-stage homogenization treatment on an aluminum alloy cast ingot to obtain a homogenized cast ingot, conducting extrusion treatment on the homogenized cast ingot to obtain an aluminum alloy bar, and conducting reverse extrusion forging on the aluminum alloy bar to obtain the high-strength and high-toughness aluminum alloy conical pipe fitting. The high-strength and high-toughness aluminum alloy inclined-wall conical forge piece is successfully prepared by adopting a composite forming process of casting rod extrusion cogging, slitting, reverse extrusion die forging and heat treatment, and the high-strength and high-toughness aluminum alloy inclined-wall conical forge piece is excellent in comprehensive mechanical property and suitable for manufacturing torpedo shells; and the existing machining and welding process by using bars or plates is replaced, so that the utilization rate of materials is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy deformation processing technology, and in particular to a high-strength and high-toughness aluminum alloy tapered tube fitting, its preparation method, and its application. Background Technology

[0002] To reduce drag and improve corrosion resistance during underwater travel, torpedo casings are typically designed with a tapered shape. Therefore, the bow section is usually required to be a tapered component. Since this involves connections between different sections of the torpedo, large end frames or flange ring structures must be designed for bolted connections. Currently, this type of tapered body cannot be manufactured using spinning processes; therefore, torpedoes are usually made from machined aluminum plates, and the two are typically connected by bolts. This method involves the use of a large amount of aluminum and steel (titanium, aluminum) rivets (bolts), resulting in a complex assembly process, a large overall casing mass, and a low yield rate.

[0003] Aluminum alloys are among the lightest industrially available structural metals, exhibiting both high strength and good ductility. The shape of forgings significantly influences the selection of forming processes, the formulation of process routes, and mechanical properties. Therefore, how to prepare complex tapered aluminum alloy forgings with excellent comprehensive mechanical properties is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the first objective of this invention is to provide a method for preparing a high-strength and high-toughness aluminum alloy tapered tube.

[0005] The second objective of this invention is to provide a high-strength and high-toughness aluminum alloy tapered pipe fitting prepared by the above-described preparation method.

[0006] The third objective of this invention is to provide an application of a high-strength and high-toughness aluminum alloy tapered tube prepared by the above-described preparation method.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This invention discloses a method for preparing high-strength and high-toughness aluminum alloy tapered pipe fittings. The method involves sequentially subjecting an aluminum alloy ingot to a two-stage homogenization process to obtain a homogenized ingot, then extruding the homogenized ingot to obtain an aluminum alloy bar, and finally forging the aluminum alloy bar by reverse extrusion to obtain a tapered pipe blank. The tapered pipe blank is then subjected to solution treatment, water quenching, and aging treatment to obtain the aluminum alloy tapered pipe fitting.

[0009] In existing technologies, aluminum alloy tapered tubes are all manufactured by machining and welding sheet metal or by bolting, resulting in insufficient strength of the finished product seams. This invention achieves more effective microstructure homogenization by subjecting aluminum alloy ingots to a two-stage homogenization process. The ingots are then first extruded to form aluminum alloy bars. During the extrusion process, the dendrites, compound segregation, and defects in the ingots are severely broken down by thermal deformation, laying the foundation for subsequent reverse extrusion forging. Then, a tapered tube blank is directly extruded and forged during the reverse extrusion forging process. Due to the prior extrusion treatment, the flow is more uniform during the reverse extrusion forging process, enabling the formation of a tapered tube blank and a uniform ultrafine grain structure. Finally, through heat treatment, a high-strength and high-toughness aluminum alloy tapered tube with multi-scale second phases is obtained, which can be directly used in torpedo casings.

[0010] In a preferred embodiment, the aluminum alloy ingot has the following composition by mass percentage: Zn 5.1-6.5%, Mg 2.0-3.0%, Cu 1.2-2.7%, Mn 0.2-0.35%, Cr 0.15-0.3%, V 0.15-0.3%, Er 0.1-0.5%, Y 0.1-0.3%, Sr 0.15-0.25%, Ti≤0.15%, Zr≤0.15%, Fe≤0.05%, Si≤0.05%, with the balance being Al and unavoidable impurities.

[0011] The aluminum alloy ingot provided by this invention incorporates a significant amount of elements. Through the synergistic effect of these components, it exhibits excellent machinability. Furthermore, the process of this invention enables the formation of multi-scale second phases through interactions, ultimately resulting in high-strength and high-toughness aluminum alloy tapered tubular components. Specifically, Mg and Si form a nano-Mg2Si phase, which is the basis for precipitation strengthening; Cu and Mg form an Al2CuMg (S phase), providing high strength and heat resistance; Zn, Mg, and Cu form strengthening phases similar to the η / T phase, such as Al2Mg3Zn and Al4Cu3Zn, collectively achieving ultra-high strength. The complex (AlCuMgSiZn) multi-component phase further synergistically strengthens and enhances thermal stability. Mn, Cr, Fe, etc., form Al... 12 Mn, Al 13Intermetallic compounds such as Cr2 and Al13Fe4, despite their low solid solubility, can refine grains, improve corrosion resistance and thermal stability. Powerful grain refiners Ti and Zr form fine Al3Ti, Al3Zr, and Al3SiZr, which act as heterogeneous nucleation cores, significantly refining grains and inhibiting recrystallization, thus improving strength and toughness. Rare earth elements Y (and Er) form thermally stable phases such as Al3Y, pinning grain boundaries and significantly enhancing high-temperature performance and corrosion resistance. Trace amounts of Sr form the Al4Sr phase, effectively modifying eutectic silicon and improving alloy plasticity. These second phases constitute a multi-scale strengthening system: nano-precipitates provide core strength; micron-sized compounds refine the microstructure; and rare earth elements and modifiers optimize the microstructure. The interactions of these elements synergistically enhance the overall performance of the alloy through multiple strengthening mechanisms, including solid solution, precipitation, and grain refinement.

[0012] In a preferred embodiment, the aluminum alloy ingot is obtained as follows: each metal raw material is prepared according to the design ratio and placed in a reverberatory furnace to be melted at 735℃-765℃ to obtain an aluminum alloy melt. After filtration, the aluminum alloy melt flows into a holding furnace through a chute. In the holding furnace, degassing, composition adjustment, and refining are carried out. Then, the temperature is lowered to 720-730℃ to obtain a refined aluminum melt. This melt then flows into a bottom-feed ceramic filter through a chute and then into a crystallizer equipped with an electromagnetic stirrer. The crystallizer is first stirred at 30-50Hz for 5-10s, then stirred at 20-25Hz for 5-10s, and finally cast at a casting speed of 50-100mm / min to obtain the ingot.

[0013] In a preferred embodiment, the two-stage homogenization process involves first holding the material at 350–450°C for 4–20 hours, and then holding it at 500–540°C for 8–24 hours. Controlling the temperature of the two-stage homogenization process within the range specified in this invention results in aluminum alloy tapered tubular fittings with optimal performance.

[0014] In a preferred embodiment, the extrusion process involves first preheating the homogenized ingot at 470-520℃, and then extruding it. During extrusion, the extrusion ratio is controlled at approximately 10-13, and the extrusion speed is 0.5-6 mm / s.

[0015] In the actual operation of this invention, after extrusion is completed, the extruded bar with a diameter of 300-350mm is cut into a length of 250-300mm.

[0016] In a preferred embodiment, the reverse extrusion forging process involves heating the aluminum alloy bar to 400-500℃, holding it at that temperature for 2-3 hours, and then performing reverse extrusion forging. The reverse extrusion forging speed is controlled at 1-10 mm / s, and the deformation is 60-80%.

[0017] In a further preferred embodiment, the reverse extrusion forging die comprises an outer die with an inner wall bevel angle, a bottom core, and a punch.

[0018] In a further preferred embodiment, the material of the reverse extrusion forging die is H13 steel.

[0019] In a preferred embodiment, the solution treatment temperature is 460–550°C, preferably 500–550°C, and the solution treatment time is 1–12 hours, preferably 2–3 hours.

[0020] In a preferred embodiment, the aging treatment temperature is 200–250°C, and the aging treatment time is 2–6 hours.

[0021] Based on the time aging, the following second phase was obtained through analysis: Al 12 Mn, Al 18 Mg3V2, Al3SiZr, Al3Ti, Al4Sr, Mg2Si, Al2CuMg, Al 13 Cr2, Al 13 Fe4, Al3Y, Al4CuZn, Al2MgZn, (Al Cu Mg SiZn) (Al Cu Mg SiZn) 2， These second phases constitute a multi-scale strengthening system, giving the aluminum alloy tapered tube provided by this invention high strength and high toughness.

[0022] In actual operation, the aged billet is precision machined to obtain finished parts.

[0023] The present invention also provides a high-strength and high-toughness aluminum alloy tapered pipe fitting prepared by the above preparation method.

[0024] The present invention also provides an application of a high-strength and high-toughness aluminum alloy tapered tube prepared by the above preparation method, wherein the aluminum alloy tapered tube is used as a torpedo shell.

[0025] Beneficial effects

[0026] This invention employs a composite forming process of cast rod extrusion blanking + slitting + reverse extrusion die forging + heat treatment to successfully produce high-strength and high-toughness aluminum alloy inclined wall conical forgings with excellent comprehensive mechanical properties. It is suitable for manufacturing torpedo shells and replaces the existing machining and welding processes using bars or plates, thus greatly improving the utilization rate of materials. Attached Figure Description

[0027] Figure 1 A cross-sectional view of the aluminum alloy tapered tube provided by the present invention. Detailed Implementation

[0028] Example 1

[0029] S1. The aluminum alloy ingot comprises the following elements by weight percentage: Zn: 5.1%, Mg: 2.1%, Cu: 1.2%, Mn: 0.2%, Cr: 0.15%, V: 0.15%, Er: 0.1%, Y: 0.1%, Sr: 0.25%, Ti≤0.15%, Zr:≤0.15%, Fe:≤0.05%, Si:≤0.05%, with the balance being Al and unavoidable impurities; each metal raw material shall be prepared according to the above design proportions.

[0030] S2 involves melting various metal raw materials in a reverberatory furnace at 765°C to obtain an aluminum alloy melt. After filtration, the aluminum alloy melt flows through a chute into a holding furnace, where it undergoes degassing, composition adjustment, and refining before being cooled to 730°C. The resulting aluminum melt then flows through a chute into a bottom-feed ceramic filter device, and the filtered melt flows into an electromagnetic continuous casting machine equipped with electromagnetic stirring.

[0031] S3. Casting: The molten material is stirred in stages. It flows into a crystallizer equipped with an electromagnetic stirrer. It is first stirred at 30Hz for 5 seconds, and then stirred at 20Hz for 10 seconds to obtain an ingot with a diameter of 3500mm.

[0032] S4. The ingot obtained in step S3 is subjected to a two-stage homogenization process. The two-stage homogenization process is as follows: first, it is kept at 450℃ for 20 hours, and then it is kept at 500℃ for 8 hours.

[0033] S5. The ingot obtained in step S3 after two-stage homogenization and annealing is subjected to extrusion treatment. First, it is kept at 470℃ for 4 hours, and then extruded. The extrusion temperature is controlled at 500℃, the extrusion ratio is 10, and the extrusion speed is 3mm / s to obtain aluminum alloy rods. The rods with a diameter of 300mm are cut into lengths of 300mm.

[0034] S6. The aluminum alloy bar is subjected to reverse extrusion forging. The aluminum alloy bar is heated to 480°C and held for 3 hours. The deformation amount of reverse extrusion forging is 80%, and a tapered tube blank is obtained.

[0035] S7. The aluminum alloy tapered tube blank obtained in step S6 is subjected to solution treatment at a temperature of 520℃ for 10 hours, followed by water quenching and aging treatment at a temperature of 230℃ for 4 hours. The aging-treated blank is then precision machined to obtain the finished part, thus obtaining the finished aluminum alloy product.

[0036] Example 2

[0037] S1. The aluminum alloy ingot comprises the following elements by weight percentage: Zn: 6.0%, Mg: 2.5%, Cu: 2.0%, Mn: 0.25%, Cr: 0.20%, V: 0.20%, Er: 0.3%, Y: 0.2%, Sr: 0.25%, Ti≤0.15%, Zr: ≤0.15%, Fe: ≤0.05%, Si: ≤0.05%, with the balance being Al and unavoidable impurities.

[0038] S2 involves melting various metal raw materials in a reverberatory furnace at 760°C to obtain an aluminum alloy melt. After filtration, the aluminum alloy melt flows through a chute into a holding furnace, where it undergoes degassing, composition adjustment, and refining. The temperature is then lowered to 730°C. The resulting aluminum melt then flows through a chute into a bottom-feed ceramic filter, and the filtered melt flows into an electromagnetic continuous casting machine equipped with electromagnetic stirring.

[0039] S3. Casting: A staged stirring process is used. The molten metal flows into a crystallizer equipped with an electromagnetic stirrer, first stirred at 30Hz for 5 seconds, then stirred at 50Hz for 10 seconds, to obtain an ingot with a diameter of 3000mm.

[0040] S4. The ingot obtained in step S3 is subjected to a two-stage homogenization process. The two-stage homogenization process is as follows: first, it is kept at 450℃ for 20 hours, and then it is kept at 500℃ for 24 hours.

[0041] S5. The ingot obtained in step S3 after two-stage homogenization and annealing is subjected to extrusion treatment. First, it is held at 450℃ for 3 hours, and then extruded. The extrusion temperature is controlled at 500℃, the extrusion ratio is 13, and the extrusion speed is 6mm / s to obtain aluminum alloy rods. The rods with a diameter of 350mm are cut into lengths of 300mm.

[0042] S6. The aluminum alloy bar is subjected to reverse extrusion forging. The aluminum alloy bar is heated to 500°C and held for 2 hours. The deformation amount of reverse extrusion forging is 70%, and a tapered tube blank is obtained.

[0043] S7. The aluminum alloy tapered tube blank obtained in step S6 is subjected to solution treatment at a temperature of 540°C for 8 hours, followed by water quenching and aging treatment at a temperature of 200°C for 2 hours. The aging-treated blank is then precision machined to obtain the finished part, thus obtaining the finished aluminum alloy product.

[0044] Example 3

[0045] A method for preparing a high-strength, high-toughness aluminum alloy inclined-walled conical forging, wherein the aluminum alloy ingot comprises the following elements by weight percentage: Zn: 6.5%, Mg: 3.0%, Cu: 2.7%, Mn: 0.35%, Cr: 0.3%, V: 0.3%, Er: 0.5%, Y: 0.3%, Sr: 0.25%, Ti≤0.15%, Zr: ≤0.15%, Fe: ≤0.05%, Si: ≤0.05%, with the balance being Al and unavoidable impurities.

[0046] S2 involves melting various metal raw materials in a reverberatory furnace at 740°C to obtain an aluminum alloy melt. After filtration, the aluminum alloy melt flows through a chute into a holding furnace, where it undergoes degassing, composition adjustment, and refining before being cooled to 720°C. The resulting aluminum melt then flows through a chute into a bottom-feed ceramic filter device, and the filtered melt flows into an electromagnetic continuous casting machine equipped with electromagnetic stirring.

[0047] S3. Casting: A staged stirring process is used. The molten metal flows into a crystallizer equipped with an electromagnetic stirrer, and is first stirred at 20Hz for 5 seconds, then at 30Hz for 10 seconds, to obtain an ingot with a diameter of 3500mm.

[0048] S4. The ingot obtained in step S3 is subjected to a two-stage homogenization process. The two-stage homogenization process is as follows: first, it is kept at 480℃ for 20 hours, and then it is kept at 520℃ for 24 hours.

[0049] S5. The ingot obtained in step S3 after two-stage homogenization and annealing is subjected to extrusion treatment. First, it is kept at 520℃ for 3 hours, and then extrusion is carried out. The extrusion temperature is controlled at 510℃, the extrusion ratio is 10, and the extrusion speed is 5mm / s to obtain aluminum alloy rods. The rods with a diameter of 300mm are cut into lengths of 300mm.

[0050] S6. The aluminum alloy bar is subjected to reverse extrusion forging. The aluminum alloy bar is heated to 520°C and held for 2 hours. The deformation amount of reverse extrusion forging is 80%, and a tapered tube blank is obtained.

[0051] S7. The aluminum alloy tapered tube blank obtained in step S6 is subjected to solution treatment at a temperature of 530°C for 10 hours, followed by water quenching and aging treatment at a temperature of 220°C for 3 hours. The aging-treated blank is then precision machined to obtain the finished part, thus obtaining the finished aluminum alloy product.

[0052] The performance of the tapered tubes prepared in the examples was tested, and the results are shown in Table 1.

[0053]

[0054] Comparative Example 1

[0055] S1. The aluminum alloy ingot comprises the following elements by weight percentage: Zn: 5.1%, Mg: 2.1%, Cu: 1.2%, Mn: 0.2%, Cr: 0.15%, V: 0.15%, Er: 0.1%, Y: 0.1%, Sr: 0.25%, Ti≤0.15%, Zr:≤0.15%, Fe:≤0.05%, Si:≤0.05%, with the balance being Al and unavoidable impurities; each metal raw material shall be prepared according to the above design proportions.

[0056] S2 involves melting various metal raw materials in a reverberatory furnace at 765°C to obtain an aluminum alloy melt. After filtration, the aluminum alloy melt flows through a chute into a holding furnace, where it undergoes degassing, composition adjustment, and refining before being cooled to 730°C. The resulting aluminum melt then flows through a chute into a bottom-feed ceramic filter, and the filtered melt flows into a device equipped with an electromagnetic stirrer.

[0057] S3. Casting: The aluminum alloy liquid is cast into a casting.

[0058] S4. The aluminum alloy tapered tube blank obtained in step S3 is subjected to solution treatment at a temperature of 520°C for 10 hours, followed by water quenching and aging treatment at a temperature of 230°C for 4 hours. The aging-treated blank is then precision machined to obtain the finished part, thus obtaining the finished aluminum alloy product.

[0059] Comparative Example 2

[0060] S1. The aluminum alloy ingot comprises the following elements by weight percentage: Zn: 6.0%, Mg: 2.5%, Cu: 2.0%, Mn: 0.25%, Cr: 0.20%, V: 0.20%, Er: 0.3%, Y: 0.2%, Sr: 0.25%, Ti≤0.15%, Zr: ≤0.15%, Fe: ≤0.05%, Si: ≤0.05%, with the balance being Al and unavoidable impurities.

[0061] S2 involves melting various metal raw materials in a reverberatory furnace at 760°C to obtain an aluminum alloy melt. After filtration, the aluminum alloy melt flows through a chute into a holding furnace, where it undergoes degassing, composition adjustment, and refining before being cooled to 730°C. The resulting aluminum melt then flows through a chute into a bottom-feed ceramic filter, and the filtered melt flows into a device equipped with electromagnetic stirring.

[0062] S3. Casting: The aluminum alloy liquid is cast into a casting.

[0063] S4. The aluminum alloy tapered tube blank obtained in step S3 is subjected to solution treatment at a temperature of 540°C for 8 hours, followed by water quenching and aging treatment at a temperature of 200°C for 2 hours. The aging-treated blank is then precision machined to obtain the finished part, thus obtaining the finished aluminum alloy product.

[0064] Comparative Example 3

[0065] A method for preparing a high-strength, high-toughness aluminum alloy inclined-walled conical forging, wherein the aluminum alloy ingot comprises the following elements by weight percentage: Zn: 6.5%, Mg: 3.0%, Cu: 2.7%, Mn: 0.35%, Cr: 0.3%, V: 0.3%, Er: 0.5%, Y: 0.3%, Sr: 0.25%, Ti≤0.15%, Zr: ≤0.15%, Fe: ≤0.05%, Si: ≤0.05%, with the balance being Al and unavoidable impurities.

[0066] S2 involves melting various metal raw materials in a reverberatory furnace at 740°C to obtain an aluminum alloy melt. After filtration, the aluminum alloy melt flows through a chute into a holding furnace, where it undergoes degassing, composition adjustment, and refining before being cooled to 720°C. The resulting aluminum melt then flows through a chute into a bottom-feed ceramic filter, and the filtered melt flows into a device equipped with an electromagnetic stirrer.

[0067] S3. Casting: The aluminum alloy liquid is cast into a casting.

[0068] S4. The aluminum alloy tapered tube blank obtained in step S3 is subjected to solution treatment at a temperature of 530°C for 10 hours, followed by water quenching and aging treatment at a temperature of 220°C for 3 hours. The aging-treated blank is then precision machined to obtain the finished part, thus obtaining the finished aluminum alloy product.

[0069] The performance of the tapered tubes prepared in the comparative example was tested, and the results are shown in Table 2.

[0070]

[0071] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a high-strength, high-toughness aluminum alloy tapered tube fitting, characterized in that: The aluminum alloy ingot is subjected to a two-stage homogenization process to obtain a homogenized ingot. The homogenized ingot is then extruded to obtain an aluminum alloy bar. The aluminum alloy bar is then reverse extruded and forged to obtain a tapered tube blank. The tapered tube blank is then solution treated, water quenched, and then aged to obtain an aluminum alloy tapered tube fitting.

2. The method for preparing a high-strength and high-toughness aluminum alloy tapered tube according to claim 1, characterized in that: The aluminum alloy ingot, by mass percentage, has the following composition: Zn 5.1-6.5%, Mg 2.0-3.0%, Cu 1.2-2.7%, Mn 0.2-0.35%, Cr 0.15-0.3%, V 0.15-0.3%, Er 0.1-0.5%, Y 0.1-0.3%, Sr 0.15-0.25%, Ti ≤0.15%, Zr ≤0.15%, Fe ≤0.05%, Si ≤0.05%, with the balance being Al and unavoidable impurities.

3. The method for preparing a high-strength and high-toughness aluminum alloy tapered tube according to claim 1, characterized in that: The method for obtaining the aluminum alloy ingot is as follows: each metal raw material is prepared according to the design ratio and placed in a reverberatory furnace to be melted at 735℃-765℃ to obtain aluminum alloy melt. After filtration, the aluminum alloy melt flows into a holding furnace through a chute. In the holding furnace, degassing, composition adjustment and refining are carried out. Then, the temperature is lowered to 720-730℃ to obtain refined aluminum melt. It is then filtered through a bottom-feed ceramic filter device through a chute and then flows into a crystallizer with electromagnetic stirring. It is first stirred at 30-50Hz for 5-10s, then stirred at 20-25Hz for 5-10s, and then cast at a casting speed of 50-100mm / min to obtain the ingot.

4. The method for preparing a high-strength and high-toughness aluminum alloy tapered tube according to claim 1, characterized in that: The two-stage homogenization process involves first maintaining the temperature at 350–450℃ for 4–20 hours, and then maintaining the temperature at 500–540℃ for 8–24 hours.

5. The method for preparing a high-strength and high-toughness aluminum alloy tapered tube according to claim 1, characterized in that: The extrusion process is as follows: the homogenized ingot is preheated at 470-520℃, and then extruded. During extrusion, the extrusion ratio is controlled at 10-13 and the extrusion speed is 0.5-6mm / s.

6. The method for preparing a high-strength and high-toughness aluminum alloy tapered tube according to claim 1, characterized in that: The reverse extrusion forging process is as follows: the aluminum alloy bar is heated to 400-500℃ and held for 2-3 hours, and then reverse extrusion forging is performed. The reverse extrusion forging speed is controlled at 1-10 mm / s and the deformation is 60-80%.

7. The method for preparing a high-strength and high-toughness aluminum alloy tapered tube according to claim 6, characterized in that: The reverse extrusion forging die includes an outer die with an inner wall slope angle, a bottom core, and a punch; The die for the reverse extrusion forging is made of H13 steel.

8. The method for preparing a high-strength and high-toughness aluminum alloy tapered tube according to claim 6, characterized in that: The solution treatment temperature is 460–550°C, and the solution treatment time is 1–12 hours. The aging treatment temperature is 200~250℃, and the aging treatment time is 2-6h.

9. A high-strength and high-toughness aluminum alloy tapered pipe fitting prepared by the preparation method according to any one of claims 1-8.

10. The application of a high-strength, high-toughness aluminum alloy tapered tube prepared by the preparation method according to any one of claims 1-8, characterized in that: The aluminum alloy tapered tube is used as a torpedo casing.

Images