Preparation method of ultralight magnesium-lithium alloy foil

Abstract

The invention discloses a preparation method of an ultra-light magnesium-lithium alloy foil. The method comprises the following steps: 1, carrying out homogenizing annealing treatment on a magnesium-lithium alloy ingot; secondly, the magnesium-lithium alloy cast ingot obtained after homogenizing annealing treatment is subjected to hot rolling cogging, and a magnesium-lithium alloy plate blank is obtained; thirdly, the magnesium-lithium alloy plate blank is machined, then heated for rough rolling, and after edge shearing treatment, a magnesium-lithium alloy plate is obtained; and fourthly, the magnesium-lithium alloy plate is machined and then subjected to finish rolling at the room temperature, and the ultra-light magnesium-lithium alloy foil is obtained through edge shearing and straightening bending treatment. The magnesium-lithium alloy cast ingot is subjected to homogenizing annealing treatment and then sequentially subjected to hot rolling cogging, high-temperature rough rolling and room-temperature finish rolling to obtain the ultra-light magnesium-lithium alloy foil, the plate is subjected to finish rolling under the room-temperature condition, the cost is effectively reduced, deformation is uniform, the prepared ultra-light magnesium-lithium alloy foil does not have obvious edge cracks or curls, and the service life of the ultra-light magnesium-lithium alloy foil is prolonged. And the antenna is suitable for the fields of aerospace, electronic communication and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal material forming and processing manufacturing, and particularly relates to a preparation method of an ultra-light magnesium-lithium alloy foil. Background Art

[0002] Magnesium alloys have excellent properties such as low density, high specific strength, excellent electromagnetic shielding, and good shock absorption performance. And due to the fact that 100% recycling can be achieved, they are known as "green engineering materials in the 21st century". As a metal with a close-packed hexagonal structure, pure magnesium materials have poor natural symmetry of their unit cells, and the number of slip systems that can be activated at room temperature is small, resulting in poor plasticity of pure magnesium and difficulty in deep processing. As a special element that can achieve 100% solid solution substitution with Mg, the Li element can reduce the density of magnesium alloys while also reducing their c / a axis ratio, increasing the number of slip systems during the deformation process of the alloy and significantly enhancing the deformation ability, further expanding their application fields.

[0003] In recent years, with the urgent energy and environmental problems, the development of magnesium-lithium alloys has been greatly promoted, especially in the fields of aerospace, 3C electronic products, etc. Among them, due to the excellent electromagnetic shielding performance and shock absorption performance of magnesium-lithium alloy foils, magnesium-lithium alloy foils can be used to make diaphragm materials and shielding materials in the aerospace field. However, the preparation of magnesium-lithium alloy foils is still in a bottleneck period, and a series of problems often occur during the preparation process, such as uneven deformation, the need for hot rolling to meet the processing conditions and usage requirements, and high preparation costs. Therefore, developing a preparation method of an ultra-light magnesium-lithium alloy foil with low cost and excellent quality is beneficial to the further application of magnesium-lithium alloys in the aerospace and other fields. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a preparation method of an ultra-light magnesium-lithium alloy foil in view of the deficiencies of the above-mentioned prior art. This method involves subjecting a magnesium-lithium alloy ingot to homogenization annealing treatment and then successively performing hot rolling for blooming, hot rough rolling at high temperature, and cold finish rolling at room temperature to obtain the ultra-light magnesium-lithium alloy foil. By performing finish rolling on the sheet at room temperature, the cost is effectively reduced, and the deformation is uniform. The obtained ultra-light magnesium-lithium alloy foil does not show obvious edge cracking or curling, solving the problems of complex preparation processes, high production costs of existing magnesium-lithium alloy foils, and adhesion of the foil to the roll caused by hot rolling at high temperature.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a preparation method of an ultra-light magnesium-lithium alloy foil, characterized in that the method comprises the following steps:

[0006] Step 1: Wrap the magnesium-lithium alloy ingot with tin foil and bury it in a box-type annealing furnace for homogenization annealing treatment;

[0007] Step 2: Subject the homogenized and annealed magnesium-lithium alloy ingot in Step 1 to hot rolling and blooming to obtain a magnesium-lithium alloy slab.

[0008] Step 3: Machine the magnesium-lithium alloy slab obtained in Step 2, then heat it for rough rolling, and after trimming, obtain a magnesium-lithium alloy sheet.

[0009] Step 4: Machine the magnesium-lithium alloy sheet obtained in Step 3, then perform finish rolling at room temperature, and after trimming and straightening and bending treatment, obtain an ultra-light magnesium-lithium alloy foil.

[0010] In the above method for preparing an ultra-light magnesium-lithium alloy foil, it is characterized in that the annealing temperature for the homogenizing annealing treatment in Step 1 is 200°C to 300°C, and the annealing time is 6h to 10h.

[0011] In the above method for preparing an ultra-light magnesium-lithium alloy foil, it is characterized in that the temperature for the hot rolling and blooming in Step 2 is 220°C to 280°C, and the total deformation amount is 55% to 65%.

[0012] In the above method for preparing an ultra-light magnesium-lithium alloy foil, it is characterized in that the temperature for the rough rolling in Step 3 is 250°C to 300°C, and the pass deformation amount is 10% to 33%.

[0013] In the above method for preparing an ultra-light magnesium-lithium alloy foil, it is characterized in that the pass deformation amount for the finish rolling in Step 4 is 10% to 20%.

[0014] In the above method for preparing an ultra-light magnesium-lithium alloy foil, it is characterized in that the thickness of the magnesium-lithium alloy sheet in Step 3 is 2mm ± 0.5mm, and the thickness of the ultra-light magnesium-lithium alloy foil in Step 4 is 0.08mm ± 0.005mm.

[0015] The present invention has the following advantages compared with the prior art:

[0016] 1. In the present invention, after the magnesium-lithium alloy ingot is homogenized and annealed, it is first subjected to hot rolling and blooming, then high-temperature rough rolling, and finally finish rolling at room temperature to obtain an ultra-light magnesium-lithium alloy foil. By performing finish rolling on the sheet at room temperature, the cost is effectively reduced, and the deformation is uniform. No obvious edge cracking or curling occurs in the obtained ultra-light magnesium-lithium alloy foil.

[0017] 2. The preparation process of the present invention is simple, the preparation cost is low, it is suitable for large-scale production and promotion, the thickness of the obtained magnesium-lithium alloy foil is uniform and the quality is light, and it can be used for manufacturing components in fields such as aerospace and electronic communication.

[0018] The technical solution of the present invention will be further described in detail below through examples. Specific Embodiments

[0019] Example 1

[0020] This example includes the following steps:

[0021] Step 1: Wrap the magnesium-lithium alloy ingot with tinfoil, bury it in a box-type annealing furnace, and perform homogenization annealing treatment at 250 °C for 8 h;

[0022] Step 2: Perform hot rolling and blooming on the magnesium-lithium alloy ingot after the homogenization annealing treatment in Step 1 at a temperature of 250 °C with a total deformation of 60% to obtain a magnesium-lithium alloy slab;

[0023] Step 3: Machine the magnesium-lithium alloy slab obtained in Step 2, then heat it to 250 °C for rough rolling with a pass deformation of 12% - 30%, anneal and hold for 10 min between passes, and after trimming, obtain a magnesium-lithium alloy sheet with a thickness of 2 mm;

[0024] Step 4: Machine the magnesium-lithium alloy sheet obtained in Step 3, then perform finish rolling at room temperature with a pass deformation of 11% - 18%, and after trimming, straightening and bending treatment, obtain an ultra-light magnesium-lithium alloy foil with a thickness of 0.079 mm.

[0025] Example 2

[0026] This example includes the following steps:

[0027] Step 1: Wrap the magnesium-lithium alloy ingot with tinfoil, bury it in a box-type annealing furnace, and perform homogenization annealing treatment at 200 °C for 10 h;

[0028] Step 2: Perform hot rolling and blooming on the magnesium-lithium alloy ingot after the homogenization annealing treatment in Step 1 at a temperature of 220 °C with a total deformation of 60% to obtain a magnesium-lithium alloy slab;

[0029] Step 3: Machine the magnesium-lithium alloy slab obtained in Step 2, then heat it to 280 °C for rough rolling with a pass deformation of 10% - 18%, anneal and hold for 10 min between passes, and after trimming, obtain a magnesium-lithium alloy sheet with a thickness of 2.5 mm;

[0030] Step 4: Machine the magnesium-lithium alloy sheet obtained in Step 3, then perform finish rolling at room temperature with a pass deformation of 10% - 15%, and after trimming, straightening and bending treatment, obtain an ultra-light magnesium-lithium alloy foil with a thickness of 0.085 mm.

[0031] Example 3

[0032] This example includes the following steps:

[0033] Step 1: Wrap the magnesium-lithium alloy ingot with tinfoil and bury it in a box-type annealing furnace for homogenization annealing treatment at 300°C for 6 hours.

[0034] Step 2: Perform hot rolling and blooming on the magnesium-lithium alloy ingot after the homogenization annealing treatment in Step 1 at a temperature of 280°C with a total deformation of 60% to obtain a magnesium-lithium alloy slab.

[0035] Step 3: Machine the magnesium-lithium alloy slab obtained in Step 2, then heat it to 300°C for rough rolling with a pass deformation of 25% - 33%, anneal and hold for 10 minutes between passes, and after trimming, obtain a magnesium-lithium alloy sheet with a thickness of 1.5 mm.

[0036] Step 4: Machine the magnesium-lithium alloy sheet obtained in Step 3, then perform finish rolling at room temperature with a pass deformation of 14% - 20%, and after trimming, straightening and bending treatment, obtain an ultra-light magnesium-lithium alloy foil with a thickness of 0.075 mm.

[0037] The above is only a preferred embodiment of the present invention and does not impose any limitation on the present invention. Any simple modification, change and equivalent change made to the above embodiments according to the technical essence of the invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A method for preparing an ultralight magnesium-lithium alloy foil, characterized in that: The method comprises the following steps: Step 1: Wrap the magnesium-lithium alloy ingot with tin foil and bury it in a box-type annealing furnace for homogenization annealing; Step 2: hot rolling the magnesium-lithium alloy ingot after homogenization annealing in step 1 to obtain a magnesium-lithium alloy slab; Step 3: machining the magnesium-lithium alloy slab obtained in step 2, then heating it for rough rolling, and trimming it to obtain a magnesium-lithium alloy sheet; Step 4: Machining the magnesium-lithium alloy sheet obtained in step 3, and then fine-rolling it at room temperature, trimming it, and correcting the bending process to obtain an ultra-light magnesium-lithium alloy foil.

2. The method for preparing an ultralight magnesium-lithium alloy foil according to claim 1, characterized in that: The annealing temperature of the homogenization annealing treatment in step 1 is 200° C. to 300° C., and the annealing time is 6 h to 10 h.

3. The method for preparing an ultralight magnesium-lithium alloy foil according to claim 1, characterized in that: The temperature of hot rolling in step 2 is 220° C. to 280° C., and the total deformation is 55% to 65%.

4. The method for preparing an ultralight magnesium-lithium alloy foil according to claim 1, characterized in that: The temperature of the rough rolling in step 3 is 250° C. to 300° C., and the deformation amount per pass is 10% to 33%.

5. The method for preparing an ultralight magnesium-lithium alloy foil according to claim 1, characterized in that: The deformation amount of the finish rolling pass in step 4 is 10% to 20%.

6. The method for preparing an ultralight magnesium-lithium alloy foil according to claim 1, characterized in that: The thickness of the magnesium-lithium alloy plate in step three is 2 mm ± 0.5 mm, and the thickness of the ultra-light magnesium-lithium alloy foil in step four is 0.08 mm ± 0.005 mm.