CN117888042A - Preparation method of high-strength medium-plasticity magnesium rare earth alloy plate - Google Patents
Preparation method of high-strength medium-plasticity magnesium rare earth alloy plate Download PDFInfo
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- CN117888042A CN117888042A CN202410069262.7A CN202410069262A CN117888042A CN 117888042 A CN117888042 A CN 117888042A CN 202410069262 A CN202410069262 A CN 202410069262A CN 117888042 A CN117888042 A CN 117888042A
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- rare earth
- earth alloy
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- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 110
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 108
- 239000000956 alloy Substances 0.000 title claims abstract description 108
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 71
- 239000011777 magnesium Substances 0.000 title claims abstract description 71
- -1 magnesium rare earth Chemical class 0.000 title claims abstract description 71
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000001125 extrusion Methods 0.000 claims abstract description 41
- 230000032683 aging Effects 0.000 claims abstract description 16
- 238000000137 annealing Methods 0.000 claims abstract description 16
- 238000005242 forging Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 13
- 238000004321 preservation Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 239000006104 solid solution Substances 0.000 claims description 4
- 239000013078 crystal Substances 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 6
- 229910000861 Mg alloy Inorganic materials 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011534 incubation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002431 foraging effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The embodiment of the application provides a preparation method of a high-strength medium-plasticity magnesium-rare earth alloy plate, which comprises the steps of firstly carrying out solution treatment on a magnesium-rare earth alloy cast ingot, and then carrying out back extrusion treatment on the magnesium-rare earth alloy cast ingot after the solution treatment to prepare a magnesium-rare earth alloy intermediate piece; and then annealing the magnesium rare earth alloy intermediate piece, and finally forging and aging heat treatment are carried out on the magnesium rare earth alloy intermediate piece to obtain the high-strength medium-plasticity magnesium rare earth alloy plate. The magnesium rare earth alloy plate prepared by the preparation method has the strength of 400MPa and the plasticity of 13 percent, and meanwhile, the crystal grains of the magnesium rare earth alloy plate are ultrafine grains of about 0.2 microns, the deformation temperature is lower, the deformation amount is improved, and the energy consumption can be effectively reduced.
Description
Technical Field
The application relates to the technical field of magnesium alloy processing, in particular to a preparation method of a high-strength medium-plasticity magnesium rare earth alloy plate.
Background
The magnesium alloy is the lightest metal structural material at present, has higher strength and rigidity and good damping resistance and electromagnetic shielding performance, and is known as an environment-friendly engineering material for 21 st century.
The magnesium rare earth alloy is a magnesium alloy engineering application material with the best mechanical property at present, and has better high-temperature stability.
However, the magnesium rare earth alloy plate prepared by the existing magnesium rare earth alloy has higher strength, but has poorer plasticity, and can not meet the existing requirements.
Disclosure of Invention
The embodiment of the application provides a preparation method of a high-strength medium-plasticity magnesium rare earth alloy plate, which is used for solving the problems of high strength and poor plasticity of the magnesium rare earth alloy plate prepared by the prior art.
The embodiment of the application provides a preparation method of a high-strength medium-plasticity magnesium rare earth alloy plate, which comprises the following steps:
carrying out solid solution treatment on the magnesium rare earth alloy cast ingot;
performing back extrusion treatment on the magnesium-rare earth alloy cast ingot subjected to solution treatment to obtain a magnesium-rare earth alloy intermediate piece;
annealing the magnesium rare earth alloy intermediate piece;
forging and aging heat treatment are carried out on the magnesium rare earth alloy intermediate piece, and the high-strength medium-plasticity magnesium rare earth alloy plate is prepared.
In one possible implementation, the temperature of the solution treatment is in the range of 480-540 ℃.
In one possible implementation, the back extrusion treatment is performed on the magnesium rare earth alloy ingot after solution treatment, including:
performing back extrusion treatment on the magnesium rare earth alloy cast ingot by using an extrusion cylinder;
before the back extrusion treatment of the magnesium-rare earth alloy cast ingot, graphite oil is uniformly smeared on the surfaces of the magnesium-rare earth alloy cast ingot and the extrusion cylinder.
In one possible implementation, the extrusion speed of the back extrusion process is less than 1mm/s.
In one possible implementation, the extrusion ratio of the back extrusion process is in the range of 15:1 to 25:1.
In one possible implementation, the temperature range of the annealing process is 200-300 ℃;
and/or the time of the annealing treatment is 2-6 h.
In one possible implementation, during the forging process, the magnesium-rare earth alloy intermediate piece has a forging deformation of less than 10% each time;
and/or the deformation times of the magnesium-rare earth alloy intermediate piece are 1 to 5 times.
In one possible implementation, the temperature range of the aging heat treatment is 150-250 ℃;
and/or the time of the aging heat treatment is in the range of 20-40 h.
In one possible implementation, the preparation method further comprises the step of carrying out heat preservation treatment on the magnesium rare earth alloy cast ingot after the solution treatment.
In one possible implementation, the incubation time for the incubation process is in the range of 8h to 16h.
The embodiment of the application provides a preparation method of a high-strength medium-plasticity magnesium-rare earth alloy plate, which comprises the steps of firstly carrying out solution treatment on a magnesium-rare earth alloy cast ingot, and then carrying out back extrusion treatment on the magnesium-rare earth alloy cast ingot after the solution treatment to prepare a magnesium-rare earth alloy intermediate piece; and then annealing the magnesium rare earth alloy intermediate piece, and finally forging and aging heat treatment are carried out on the magnesium rare earth alloy intermediate piece to obtain the high-strength medium-plasticity magnesium rare earth alloy plate. The magnesium rare earth alloy plate prepared by the preparation method has the strength of 400MPa and the plasticity of 13 percent, and meanwhile, the crystal grains of the magnesium rare earth alloy plate are ultrafine grains of about 0.2 microns, the deformation temperature is lower, the deformation amount is improved, and the energy consumption can be effectively reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the present application and do not constitute a limitation on the invention.
In the drawings:
FIG. 1 is a schematic flow chart of a method for preparing a high-strength medium-plasticity magnesium rare earth alloy plate according to an embodiment of the present application;
fig. 2 is a diagram of a process for preparing the high strength medium plasticity magnesium rare earth alloy sheet of fig. 1.
Detailed Description
In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
In this application, unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and include, for example, either permanently connected, removably connected, or integrally formed; may be a mechanical connection; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature "above" and "over" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under," "under" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.
The magnesium alloy is the lightest metal structural material at present, has higher specific strength and specific rigidity and good damping resistance and electromagnetic shielding performance, and is known as an environment-friendly engineering material for 21 st century.
The magnesium rare earth alloy is a magnesium alloy engineering application material with the best mechanical property at present, and has better high-temperature stability.
However, the magnesium rare earth alloy plate prepared by the existing magnesium rare earth alloy has higher strength, but has poorer plasticity, and can not meet the existing requirements. Specifically, the main reason that the magnesium rare earth alloy plate prepared by the existing magnesium rare earth alloy has poor plasticity is that the rare earth second phase is mostly a hard and brittle phase, the atomic radius of the rare earth element is larger, and the pinning effect on the grain boundary is stronger. After aging treatment, the density of the precipitated phase is further increased, the pinning effect becomes stronger, and the ability to block dislocation movement becomes stronger.
In order to solve the above problems, the embodiments of the present application provide a method for preparing a high-strength medium-plasticity magnesium rare earth alloy sheet, and the following will describe the solution provided in the embodiments of the present application in detail with reference to the accompanying drawings.
The embodiment of the application provides a preparation method of a high-strength medium-plasticity magnesium rare earth alloy plate, which is used for solving the problems of high strength and poor plasticity of the magnesium rare earth alloy plate prepared by the prior art.
FIG. 1 is a schematic flow chart of a method for preparing a high-strength medium-plasticity magnesium rare earth alloy plate according to an embodiment of the present application; fig. 2 is a diagram of a process for preparing the high strength medium plasticity magnesium rare earth alloy sheet of fig. 1.
Referring to fig. 1 and 2, the embodiment of the application provides a preparation method of a high-strength medium-plasticity magnesium rare earth alloy plate, which comprises the following steps:
s100: and carrying out solid solution treatment on the magnesium rare earth alloy cast ingot.
Specifically, the magnesium-rare earth alloy ingot is transferred to a solution furnace for solution treatment. The temperature range of the solution treatment can be 480-540 ℃, then the heat preservation is carried out for 8-16 h, and after the heat preservation is finished, the treated magnesium-rare earth alloy cast ingot is cooled by air.
S200: and performing back extrusion treatment on the magnesium-rare earth alloy cast ingot subjected to solution treatment to obtain a magnesium-rare earth alloy intermediate piece.
And performing back extrusion treatment on the magnesium rare earth alloy cast ingot by using an extrusion die. For example, the magnesium rare earth alloy ingot may be back-extruded using an extrusion barrel. Specifically, placing the magnesium-rare earth alloy cast ingot after solution treatment in a storage bin of an extrusion cylinder, and then applying pressure to the magnesium-rare earth alloy cast ingot.
In order to ensure the smoothness during the back extrusion treatment, the temperature of the extrusion cylinder is increased to 150-300 ℃ before the back extrusion treatment is carried out on the magnesium rare earth alloy cast ingot, and graphite oil is required to be uniformly coated on the surfaces of the magnesium rare earth alloy cast ingot and the extrusion cylinder.
In addition, the extrusion speed of the back extrusion treatment is illustratively less than 1mm/s. The extrusion ratio of the back extrusion treatment is 15:1-25:1, and the magnesium rare earth alloy intermediate piece is prepared after extrusion is completed. And finally, air cooling and cooling are carried out on the extruded magnesium rare earth alloy intermediate piece so as to facilitate the continuous treatment of the magnesium rare earth alloy intermediate piece.
S300: and (5) annealing the magnesium rare earth alloy intermediate piece.
Illustratively, in this step, the magnesium-rare earth alloy intermediate piece is transferred into an annealing furnace for annealing treatment, and the temperature of the annealing treatment can be in the range of 200-300 ℃; the time of the annealing treatment can be 2-6 hours.
S400: forging and aging heat treatment are carried out on the magnesium rare earth alloy intermediate piece, and the high-strength medium-plasticity magnesium rare earth alloy plate is prepared.
Illustratively, in this step, the annealed magnesium-rare earth alloy intermediate member is subjected to forging treatment using a forging apparatus. During forging treatment, the deformation of the magnesium-rare earth alloy intermediate piece is less than 10% each time; the deformation times are 1-5 times.
And after the forging is finished, placing the treated magnesium-rare earth alloy intermediate piece in an aging furnace for aging heat treatment. The temperature range of the aging heat treatment is 150-250 ℃; the time range of the aging heat treatment is 20h-40h.
In some other examples, the preparation method further comprises heat-preserving the magnesium-rare earth alloy ingot after the solution treatment. Specifically, after the solid solution of the magnesium-rare earth alloy ingot is completed, the ingot is transferred to heat preservation equipment for heat preservation treatment. The temperature of the heat preservation can be 150-300 ℃.
The magnesium rare earth alloy plate prepared by the preparation method has the strength of 400MPa and the plasticity of 13 percent, and meanwhile, the crystal grains of the magnesium rare earth alloy plate are ultrafine grains of about 0.2 microns, the deformation temperature is lower, the deformation amount is improved, and the energy consumption can be effectively reduced.
In order to better illustrate the solution of the embodiments of the present application, a specific embodiment will be provided below.
The invention provides a preparation method of a high-strength medium-plasticity magnesium rare earth alloy plate, which comprises the following steps:
step 1: solution treatment of
And carrying out solution treatment on the Mg-Gd-Li system cast ingot at 520 ℃, preserving the heat for 12 hours, and then carrying out air cooling.
Step 2: back extrusion treatment
Carrying out heat preservation on the ingot after solution treatment for 30min at 300 ℃; the extruder was then heated to 250 ℃.
The extrusion ratio was chosen to be 25:1, extruding bars with the diameter of 30 mm. And brushing graphite lubricating oil on the surfaces of the cast ingot and the extrusion cylinder before extrusion, wherein the extrusion speed is 0.4mm/s, and performing air cooling treatment to obtain the magnesium rare earth alloy intermediate piece.
Step 3: and (3) annealing the prepared magnesium rare earth alloy intermediate piece, wherein the annealing temperature is 300 ℃, the heat preservation is carried out for 10min, and the annealing time is 4h.
Step 4: forging the annealed magnesium-rare earth alloy intermediate piece, wherein each deformation amount is 5%, and forging is carried out for 5 passes.
Step 5: and after forging, carrying out aging heat treatment on the magnesium rare earth alloy intermediate piece, wherein the aging temperature is 200 ℃, and the aging time is 20 hours.
The magnesium rare earth alloy plate prepared by the preparation method has the strength of 400MPa and the plasticity of 13 percent, and meanwhile, the crystal grains of the magnesium rare earth alloy plate are ultrafine grains of about 0.2 micrometer.
It is to be understood that, based on the several embodiments provided in the present application, those skilled in the art may combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments, where none of the embodiments exceed the protection scope of the present application.
The foregoing detailed description of the embodiments of the present application has further described the objects, technical solutions and advantageous effects thereof, and it should be understood that the foregoing is merely a specific implementation of the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application, and any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of the embodiments of the present application.
Claims (10)
1. The preparation method of the high-strength medium-plasticity magnesium rare earth alloy plate is characterized by comprising the following steps:
carrying out solid solution treatment on the magnesium rare earth alloy cast ingot;
performing back extrusion treatment on the magnesium-rare earth alloy cast ingot after solution treatment to obtain a magnesium-rare earth alloy intermediate piece;
annealing the magnesium rare earth alloy intermediate piece;
and forging and aging heat treatment are carried out on the magnesium rare earth alloy intermediate piece, so that the high-strength medium-plasticity magnesium rare earth alloy plate is prepared.
2. The method for producing a high-strength medium-plasticity magnesium rare earth alloy sheet according to claim 1, wherein the temperature range of the solution treatment is 480 ℃ to 540 ℃.
3. The method for preparing a high-strength medium-plasticity magnesium-rare earth alloy sheet according to claim 1, wherein the step of performing the back extrusion treatment on the magnesium-rare earth alloy ingot after the solution treatment comprises the steps of:
performing the back extrusion treatment on the magnesium-rare earth alloy cast ingot by using an extrusion cylinder;
and before the back extrusion treatment is carried out on the magnesium-rare earth alloy cast ingot, graphite oil is uniformly smeared on the surfaces of the magnesium-rare earth alloy cast ingot and the extrusion cylinder.
4. The method for producing a high-strength medium-plasticity magnesium rare earth alloy sheet according to claim 1, wherein the extrusion speed of the back extrusion treatment is less than 1mm/s.
5. The method for preparing a high-strength medium-plasticity magnesium rare earth alloy sheet according to claim 1, wherein the extrusion ratio of the back extrusion treatment is in the range of 15:1-25:1.
6. The method for preparing a high-strength medium-plasticity magnesium rare earth alloy sheet according to claim 1, wherein the annealing treatment is performed at a temperature ranging from 200 ℃ to 300 ℃;
and/or the annealing treatment time is 2-6 h.
7. The method for producing a high-strength medium-plasticity magnesium rare earth alloy sheet according to claim 1, wherein the magnesium rare earth alloy intermediate piece has a forging deformation amount of less than 10% each time during the forging treatment;
and/or the deformation times of the magnesium-rare earth alloy intermediate piece are 1-5 times.
8. The method for preparing a high-strength medium-plasticity magnesium rare earth alloy plate according to claim 1, wherein the temperature range of the aging heat treatment is 150-250 ℃;
and/or the time range of the aging heat treatment is 20-40 h.
9. The method for producing a high-strength medium-plasticity magnesium-rare earth alloy sheet according to claim 1, further comprising heat-insulating the magnesium-rare earth alloy ingot after the solution treatment.
10. The method for preparing a high-strength medium-plasticity magnesium rare earth alloy plate according to claim 9, wherein the heat preservation time of the heat preservation treatment is 8-16 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410069262.7A CN117888042A (en) | 2024-01-18 | 2024-01-18 | Preparation method of high-strength medium-plasticity magnesium rare earth alloy plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410069262.7A CN117888042A (en) | 2024-01-18 | 2024-01-18 | Preparation method of high-strength medium-plasticity magnesium rare earth alloy plate |
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| Publication Number | Publication Date |
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| CN117888042A true CN117888042A (en) | 2024-04-16 |
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|---|---|---|---|
| CN202410069262.7A Pending CN117888042A (en) | 2024-01-18 | 2024-01-18 | Preparation method of high-strength medium-plasticity magnesium rare earth alloy plate |
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| Country | Link |
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| CN (1) | CN117888042A (en) |
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- 2024-01-18 CN CN202410069262.7A patent/CN117888042A/en active Pending
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