Patent Application
20240043977
This application claims priority based on Chinese patent application No. 202210921961.0 filed on Aug. 2, 2022, the entire contents of which are hereby incorporated by reference.
The present invention relates to the technical field of manufacturing and processing of metal composites, and in particular to a high interfacial bonding strength laminated aluminum alloy manufacturing method.
With the development of modern warfare, armored vehicles will be subjected to more lethal attacks on all fronts in future combat, putting forward new and higher requirements for armor material defense and survivability. Armored vehicle defense materials require good processing performance, light weight, good impact resistance, excellent welding performance, good corrosion resistance and other advantages. Homogeneous armors are difficult to be effective for all kinds of anti-armor weapons. Although increasing the thickness of homogeneous armor can improve its defense ability, it will also increase the mass of armored vehicles and reduce their flexibility. In order to further improve the ballistic performance of armored vehicles while protecting against different anti-armor weapons, the use of materials with different properties to make composite armor materials has become the main direction of armor material development. Composite armor performance with designability can be designed according to the combat environment and the use of different parts of a series of different performance, different mass and thickness of the armor, such as: research shows that the material with reinforcement structure of the ballistic performance is much higher than the ballistic performance without reinforcement structure. Nowadays, the laminated composite armor includes multi-layer aluminum alloy armor, titanium/aluminum multi-layer composite armor, steel/aluminum composite armor, etc. Although the laminated composite armor has a series of advantages, there are disadvantages such as complicated manufacturing technology, high cost, poor bonding between layers, easy to crack, etc. Moreover, the interface of the laminated aluminum alloy prepared by the traditional method is flat, and the improvement of the bonding strength between the interfaces of the components is greatly limited, and the cracking between layers is easy to occur.
Therefore, it is of great importance and practical value to develop a method for manufacturing a stacked aluminum alloy that is easy to operate, has strong interlayer bonding.
The purpose of the present invention is to provide a high interfacial bonding strength laminated aluminum alloy manufacturing method to solve the technical problem of poor interlayer bonding and easy delamination cracking of laminated aluminum alloys in the prior art.
In order to achieve the purpose of the present invention, the present invention provides the following technical scheme:
The present invention provides a high interfacial bonding strength laminated aluminum alloy manufacturing method, comprising the following steps:
In the friction stir treatment in said step (3), the stirring needle is provided with a thread, the length of the stirring needle h=hrear+hmiddle+(0.1−10) mm, wherein, hrear and hmiddle are the thickness of the rear plate and the middle plate after roll-bonding in step (2), respectively; during friction stir treatment, the stirring tool rotates into the laminated aluminum alloy from the rear plate side, and the back tilt angle of the stirring tool is 1-3°; and the feed speed is 50-250 mm/min and the rotation speed is 400-2,500 r/min.
Further, said step (1) in which the rear plate comprises 7N01 aluminum alloy or 7A52 aluminum alloy; said middle plate comprises 1-series pure aluminum alloy or 7A01 aluminum alloy; and said front plate comprises 7055 aluminum alloy or 7A62 aluminum alloy.
Further, said step (1) firstly, the rear plate, middle plate and front plate are surface treated and then combined, said surface treatment steps are: alkaline washing with 5-15 wt % NaOH solution for 3-10 min and then rinsing with 80-100° C. water, then acid washing with 5-15 wt % HNO3 solution for 3-10 min and then rinsing with 5-15° C. water, and finally blowing dry, interface sanding treatment in sequence.
Further, said step (2) in the heat treatment temperature of 400-450° C., the heat treatment time of 1 to 3 h.
Further, the thickness of the laminated aluminum alloy in step (2) is 3-60 mm.
Further, the temperature of heat treatment in said step (4) is 370-420° C. and the time of heat treatment is 1 to 2 h.
Further, the temperature of the solid solution treatment in said step (4) is 450-490° C., and the time of the solution treatment is 1 to 3 h.
Further, the temperature of aging treatment in said step (4) is 100-150° C., and the time of aging treatment is 12 to 48 h.
The present invention frictionally treats the laminated aluminum alloy by friction stir processing, and the interlayer structure in the stirred area is broken, and a three-dimensional spatial structure consisting of the nugget zone and an interlocked structural zone is formed. Since the strength of materials in the interlocked zone and the nugget zone is much higher than that of the bonding interface, therefore, the interfacial bonding strength of the laminated aluminum alloy is greatly improved.
The present invention has less welding defects, the weld microstructure is strengthened in subsequent rolling, solid solution and aging treatments, so that the overall strength of the laminated aluminum alloy can be effectively maintained.
The manufacturing method provided in the present invention is easy to operate and can be industrialized.
The manufacturing method provided by the present invention can be used for single-layer metallic materials and laminated metallic composites to prevent delamination cracking of thick metallic plates or laminated metallic composites.
The present invention provides a high interfacial bonding strength laminated aluminum alloy manufacturing method, comprising the following steps:
In the present invention, the rear plate in said step (1) includes 7N01 aluminum alloy or 7A52 aluminum alloy, preferably 7N01 aluminum alloy; said middle plate includes 1-series pure aluminum or 7A01 aluminum alloy, preferably 1-series pure aluminum; said front plate includes 7055 aluminum alloy or 7A62 aluminum alloy, preferably 7055 aluminum alloy.
According to the present invention, preferably the rear plate, middle plate and front plate in the said step (1) are combined after surface treatment, and the said surface treatment steps include: alkaline wash with 5-15 wt % NaOH solution for 3-10 min and then rinse with 80-100° C. water, then acid wash with 5-15 wt % HNO3 solution for 3-10 min and then rinse with 5-15° C. water, and finally blow dry in turn, the Interface polishing treatment; preferably with 10 wt % of NaOH solution alkaline wash 5 min after rinsing with 80° C. water, then with 10 wt % of HNO3 solution acid wash 5 min after rinsing with 10° C. water, and finally blow dry, interface polishing treatment in turn.
In the present invention, said fixing is preferably to drill holes at the front and rear ends of the combined plate and fix it by riveting with aluminum alloy rivets.
In the present invention, the temperature of heat treatment in said step (2) is 400-450° C., preferably 410-440° C., further preferably 420-430° C.; the time of heat treatment is 1-3 h, preferably 1.5-2.5 h, further preferably 2 h.
In the present invention, in the friction stir treatment in said step (3), the stirring needle is provided with a thread, the length of the stirring needle h=hrear+hmiddle+(0.1−10) mm, wherein, hrear and hmiddle are the thickness of the rear plate and the middle plate after roll-bonding in step (2), respectively; during friction stir treatment, the stirring tool rotates into the laminated aluminum alloy from the rear plate side, and the back tilt angle of the stirring tool is 1-3°, preferably 2°; and the feed speed is 50-250 mm/min, preferably 100-160 mm/min and the rotation speed is 400-2,500 r/min, preferably 1,600-2,000 r/min, further preferably 1,800 r/min.
In the present invention, the temperature of heat treatment in said step (4) is 370-420° C., preferably 380-410° C., further preferably 390-400° C.; the time of heat treatment is 1-2 h, preferably 1.5 h.
In the present invention, the temperature of the solid solution treatment in said step (4) is 450-490° C., preferably 460-480° C., further preferably 470° C.; the time of the solution treatment is 1-3 h, preferably 1.5-2.5 h, further preferably 2 h.
In the present invention, the temperature of aging treatment in said step (4) is 100-150° C., preferably 110-140° C., further preferably 120° C.; the time of aging treatment is 12-48 h, preferably 16-40 h, further preferably 20 to 36 h.
In the following, the technical scheme provided by the present invention will be described in detail with reference to the embodiments, but they should not be construed as limiting the scope of the present invention.
Firstly, the 7A52 aluminum alloy rear plate with thickness of 9 mm, the 7A01 aluminum alloy middle plate with thickness of 1 mm, and the 7A62 aluminum alloy front plate with thickness of 26 mm are subjected to surface treatment: alkaline wash with 10 wt % NaOH solution for 5 min and then rinse with 80° C. water, then acid wash with 10 wt % HNO3 solution for 5 min and then rinse with 10° C. water, and finally blow dry with hot air and use steel wire brush to polish, then combine the rear plate, middle plate and front plate, drill holes in the front and rear ends of the combined plate, and fix them with aluminum rivets to obtain the combined plate;
Conduct the first rolling compound after heat treatment of the combined plate for 2 h at 420° C., and the thickness of the laminated aluminum alloy obtained is 10 mm, wherein hrear+hmiddle is about 2.8 mm;
Set the 10 mm thick aluminum alloy weld-start plate and lead-out plate on the laminated aluminum alloy of thickness 10 mm, and then carrying out friction stir treatment, wherein the stirring needle is provided with a thread, the length of the stirring needle is 3.5 mm, the stirring needle rotates in from the side of the 7A52 aluminum alloy rear plate, the back tile angle of the stirring tool is 1.5°, the feed speed is 100 mm/min and the stirring rotation speed is 1,750 r/min during the friction stir treatment;
After the stirring treatment, the laminated aluminum alloy is heat-treated at 380° C. for 1.5 h and then rolled for the second time to obtain the laminated aluminum alloy with thickness of 8 mm, and then the laminated aluminum alloy is solid solution treated at 470° C. for 2 h and aged at 120° C. for 24 h to obtain the laminated aluminum alloy with high interfacial bond strength.
Firstly, 7A52 aluminum alloy rear plate with thickness of 17 mm, 7A01 middle plate with thickness of 1 mm, and 7A62 aluminum alloy front plate with thickness of 17 mm were subjected to surface treatment: alkaline washing with 5 wt % NaOH solution for 10 min and then rinsing with 100° C. water, then acid washing with 15 wt % HNO3 solution for 3 min and then rinsing with 15° C. water, finally blowing dry with hot air and polishing the interface with a wire brush and then the rear plate, middle plate and front plate are combined, and holes are drilled at the front and rear ends of the combined plate and fixed by riveting with aluminum alloy to obtain the combined plate;
Conduct the first rolling compound after heat treatment of the combined plate for 3 h at 410° C., and obtaining the laminated aluminum alloy with a thickness of 15 mm, wherein the hrear+hmiddle is about 7.7 mm;
Set the 15 mm aluminum alloy weld-start plate and the lead-out plate on the laminated aluminum alloy with the thickness of 15 mm, and then carrying out the friction stir treatment, wherein the stirring needle is provided with a thread, the length of the stirring needle is 8.5 mm, the stirring tool rotates in from the side of the 7A52 aluminum alloy rear plate, the back tilt angle of the stirring tool is 1°, the feed speed during the friction stir treatment is 150 mm/min and the stirring rotation speed is 1,500 r/min;
After the stirring treatment, the laminated aluminum alloy is heat-treated at 390° C. for 1 h and then rolled for the second time to obtain the laminated aluminum alloy with thickness of 6 mm, and then the laminated aluminum alloy is solid solution treated at 460° C. for 3 h and aged at 110° C. for 12 h to obtain the laminated aluminum alloy with high interfacial bond strength.
Firstly, 7N01 aluminum alloy rear plate with thickness of 15 mm, pure aluminum middle plate with thickness of 1 mm, and 7055 aluminum alloy front plate with thickness of 20 mm were subjected to surface treatment: alkaline washing with 15 wt % NaOH solution for 3 min and then rinsing with water at 90° C., then acid washing with 5 wt % HNO3 solution for 10 min and then rinsing with water at 5° C., finally blowing dry with hot air and using wire brush for the interface grinding, then combine the rear plate, middle plate and front plate, drill holes at the front and rear ends of the combined plate, and fix them with aluminum rivets to obtain the combined plate.
Apply heat treating to the combined plate at 450° C. for 1 h and then rolling the laminated aluminum alloy for the first time to obtain the thickness of 11 mm, wherein the hrear+hmiddle is about 4.9 mm;
Setting the 11 mm aluminum alloy weld-start plate and lead-out plate on the laminated aluminum alloy with a thickness of 11 mm, and then carrying out friction stir treatment, wherein the stirring needle is provided with a thread, the length of the stirring needle is 6 mm, the stirring tool rotates in from the side of the 7N01 aluminum alloy rear plate side, the back tilt angle of the stirring tool is 2°, the feed speed during the friction stir treatment is 250 mm/min and the stirring rotation speed is 800 r/min;
After the stirring treatment, the laminated aluminum alloy is heat-treated at 370° C. for 2 h and then rolled for the second time to obtain the laminated aluminum alloy with 8 mm thickness, and then the laminated aluminum alloy is solid solution treated at 480° C. for 1 h and aged at 120° C. for 36 h to obtain the laminated aluminum alloy with high interfacial bonding strength.
Contrast 1
The difference from Embodiment 1 is that, instead of friction stir treatment and second rolling treatment for the laminated aluminum alloy, the laminated aluminum alloy with 8 mm thickness is directly rolled after heating the combined plate for 2 h under 420° C., then the laminated aluminum alloy is subject to solid solution treatment under 470° C. for 2 h followed by 24h of aging treatment under 120° C., and other conditions are the same as those of Embodiment 1.
As being revealed from the above embodiments, the present invention provides a high interfacial bonding strength laminated aluminum alloy manufacturing method, which firstly fixes the combination of rear plate, middle plate and front plate, then performs the first roll-boding treatment after heat treatment of the combined plate, then performs friction stir treatment on the obtained laminated aluminum alloy, and finally obtains the laminated aluminum alloy with high interfacial bond strength by heat treatment, second rolling treatment, solution treatment and aging treatment. The laminated aluminum alloy prepared by the present invention breaks through the limitation of traditional laminated aluminum alloy material interface being plane, and a laminated aluminum alloy with a spatial structure is prepared and the interlayer bonding strength is greatly improved.
The foregoing is only a preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, several modifications and improvements can be made without departing from the principles of the present invention, and these modifications and improvements should also be considered as the scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202210921961.0 | Aug 2022 | CN | national |
