CN118028671A - Rare earth magnesium alloy plate strip with good deep drawing performance and preparation method thereof - Google Patents
Rare earth magnesium alloy plate strip with good deep drawing performance and preparation method thereof Download PDFInfo
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- CN118028671A CN118028671A CN202311792410.XA CN202311792410A CN118028671A CN 118028671 A CN118028671 A CN 118028671A CN 202311792410 A CN202311792410 A CN 202311792410A CN 118028671 A CN118028671 A CN 118028671A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 98
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 47
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 58
- 230000008878 coupling Effects 0.000 claims abstract description 33
- 238000010168 coupling process Methods 0.000 claims abstract description 33
- 238000005859 coupling reaction Methods 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 238000000137 annealing Methods 0.000 claims abstract description 21
- 238000005098 hot rolling Methods 0.000 claims abstract description 15
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- 239000011777 magnesium Substances 0.000 claims abstract description 8
- 238000009749 continuous casting Methods 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 21
- 229910045601 alloy Inorganic materials 0.000 claims description 16
- 239000000956 alloy Substances 0.000 claims description 16
- 238000007670 refining Methods 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 239000011701 zinc Substances 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
- 229910052746 lanthanum Inorganic materials 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims 1
- 238000005498 polishing Methods 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 4
- 238000000265 homogenisation Methods 0.000 abstract description 2
- 238000005242 forging Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
-
- 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)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a rare earth magnesium alloy plate strip with good deep drawing performance and a preparation method thereof, wherein the rare earth magnesium alloy plate strip comprises the following components: 0.5 to 6.0 percent of Al, 0.5 to 6.0 percent of Zn, 0.1 to 1.0 percent of Mn, 0.1 to 1.0 percent of Zr and 3.0 to 12.0 percent of RE; the balance of Mg and unavoidable impurities. The preparation process comprises smelting, semi-continuous casting, homogenization heat treatment, hot rolling cogging, thermoelectric coupling rolling and annealing. The invention realizes the large deformation rolling deformation of the magnesium alloy at low temperature (less than or equal to 100 ℃), and the product meets the high-strength and high-plasticity index and simultaneously has good drawing characteristics, thereby meeting the requirements of industries such as automobiles, electronic communication, aerospace and the like on the light weight of the product and on the special performances such as high strength, high plasticity, high drawing performance and the like of the magnesium alloy.
Description
Technical Field
The invention relates to the technical field of wrought magnesium alloy, in particular to a rare earth magnesium alloy plate strip with good deep drawing performance and a preparation method thereof.
Background
The magnesium alloy has the advantages of high specific strength and specific rigidity, good heat and electric conductivity, damping and shock absorption, electromagnetic shielding, easy processing and forming, easy recovery and the like, has extremely important application value and wide application prospect in the fields of automobiles, electronic communication, aerospace, national defense and military and the like, and is known as a green engineering material in the 21 st century. Compared with cast magnesium alloy, the wrought magnesium alloy has larger development potential, and can obtain higher strength, better ductility and more diversified mechanical properties through the control of material structure and the application of heat treatment process, thereby meeting the application requirements of diversified engineering structural parts. Wrought magnesium alloys often require heating to a temperature and processing by hot forming techniques such as extrusion, rolling, forging, and the like.
However, since the magnesium alloy has a close-packed hexagonal structure, plastic deformation at room temperature is limited to basal slip and cone twinning, thereby severely limiting the deformability of the magnesium alloy at room temperature. In general, when the deformed magnesium alloy is prepared, the deformation capacity of the magnesium alloy is improved by adopting a heating treatment mode, and when the temperature exceeds 225 ℃, the cylindrical surface and conical surface sliding system is started, so that the plastic deformation capacity is greatly improved. However, the stable production of the deformed magnesium alloy foil belt is still difficult to realize at present, and the frequent heating treatment in the actual production process can oxidize the magnesium alloy, and meanwhile, the production cost and the energy consumption of the magnesium alloy are greatly increased.
In addition, the wrought magnesium alloy plate is usually applied to stamping parts, and has high requirements on the deep drawing performance of products. Therefore, how to improve the deformability and the drawing performance of the magnesium alloy has become one of the key problems to be solved in the application field of the magnesium alloy. The rare earth element (RE) has unique extra-nuclear electron arrangement and chemical characteristics, and the addition of a proper amount of rare earth element into the magnesium alloy can enhance the interatomic bonding force and change the axial ratio of the magnesium alloy, thereby being beneficial to improving the deformability of the magnesium alloy.
The Chinese patent application with publication number of CN115074588A discloses a preparation process of a high-strength plastic rare earth magnesium alloy and the high-strength plastic rare earth magnesium alloy, wherein the main chemical components of the magnesium alloy are as follows: gd:5.5 to 10.5 percent, Y:2.5 to 5.5 percent of Mn:0.4 to 1.0 percent of Sc:0.2 to 0.5 percent and the balance of Mg. The product is a high-strength plastic rare earth magnesium alloy, the high strength and high plasticity of the magnesium alloy are concerned, but the drawing performance of the magnesium alloy is not involved.
The Chinese patent application with publication number CN110394391A discloses a device and a method for improving the drawing performance of magnesium alloy by utilizing a two-dimensional current field, which take the electro-plastic effect of current on the material forming process into consideration, and utilize an external direct current power supply to play an auxiliary role on the drawing forming process of magnesium alloy forging stock; by electrifying the forging stock, the coupling of a two-dimensional current field formed in the forging stock and a stress field in the drawing process of the forging stock is realized, and the plasticity performance of the forging stock is improved. It is related to how to improve the drawing performance of magnesium alloy, but is mainly applied to magnesium alloy forging stock, unlike the present invention.
Disclosure of Invention
The invention provides a rare earth magnesium alloy plate strip with good drawing performance and a preparation method thereof, which realize the rolling deformation of magnesium alloy with large deformation at low temperature (less than or equal to 100 ℃), and the product meets the high-strength and high-plasticity index and simultaneously has good drawing characteristics, thereby meeting the requirements of industries such as automobiles, electronic communication, aerospace and the like on the light weight of the product and on the special performances such as high strength, high plasticity, high drawing performance and the like of the magnesium alloy.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the rare earth magnesium alloy plate strip with good drawing performance comprises the following components in percentage by mass: 0.5 to 6.0 percent of Al, 0.5 to 6.0 percent of Zn, 0.1 to 1.0 percent of Mn, 0.1 to 1.0 percent of Zr and 3.0 to 12.0 percent of RE; wherein, the proportion of Gd element in RE component is 50% -90%, the rest is more than one of La, ce, sm, nd, gd/Al is 1.0-5.0, gd/Zn is 1.0-5.0; the balance of Mg and unavoidable impurities.
Further, the thickness of the rare earth magnesium alloy plate and strip finished product is 1.0-3.0 mm.
Further, the properties of the rare earth magnesium alloy plate and strip finished product are as follows: the yield strength is more than or equal to 240MPa, the tensile strength is more than or equal to 360MPa, the elongation after fracture is more than or equal to 30%, and the ultimate draw ratio LDR is more than or equal to 2.0.
The preparation method of the rare earth magnesium alloy plate strip with good drawing performance comprises the following steps of smelting, semi-continuous casting, homogenizing heat treatment, hot rolling cogging, thermo-electric coupling rolling and annealing; the preparation method comprises the following specific steps:
1) Smelting; according to the set mass percentage, firstly feeding industrial pure magnesium ingots into a crucible, and introducing inert gas for protection and heating and melting; feeding an industrial pure aluminum ingot and an industrial pure zinc ingot when the furnace temperature reaches 680-730 ℃, and feeding an Mg-RE intermediate alloy, an Mg-Mn intermediate alloy and an Mg-Zr intermediate alloy when the furnace temperature rises to 760-800 ℃; after the materials are completely melted, a refining agent is scattered into the melt for refining, wherein the refining temperature is 760-800 ℃, and the refining time is 20-40 min; then deslagging and standing to obtain magnesium alloy liquid;
2) Casting; casting the magnesium alloy liquid by adopting a semi-continuous casting process, wherein the casting temperature is 700-760 ℃; the pulling speed of the ingot is 120-180 mm/min, and a magnesium alloy ingot is obtained;
3) Homogenizing heat treatment and hot rolling cogging; placing the magnesium alloy cast ingot into a heating furnace for homogenizing heat treatment, wherein the temperature of the heating furnace is 450-600 ℃, and the heat preservation time is 10-20 h; adopting multi-pass hot rolling cogging to obtain magnesium alloy plate material with thickness of 10-20 mm; preheating a rolling mill roller to 250-350 ℃ before hot rolling and cogging;
4) Performing temperature electric coupling rolling and annealing; rolling magnesium alloy plate material by thermal-electric coupling, and preheating a rolling mill roller to 100-200 ℃ before the thermal-electric coupling rolling; the rolling speed of the rolling mill is 10-50 m/min, and the rolling passes are 3-15; the single-pass rolling reduction is 0-50%, and the total rolling deformation rate is more than or equal to 70%; wherein, when the rolling reduction rate of single pass is 0, the process is a thermal-electric coupling annealing process; when in thermal-electric coupling rolling, the electric pulse frequency is 100-2000 Hz, the voltage is 10-100V, the pulse width is 50-120 mu s, the root mean square current density is 20-120A/mm 2, and the temperature of the magnesium alloy plate is less than or equal to 100 ℃; when in thermal-electric coupling annealing, the electric pulse frequency is 100-1000 Hz, the voltage is 20-70V, the pulse width is 50-120 mu s, the root mean square current density is 5-50A/mm 2, and the temperature of the magnesium alloy plate is less than or equal to 100 ℃; and obtaining the rare earth magnesium alloy plate strip after the thermo-electric coupling rolling.
Further, in the step 1), the crucible is preheated before smelting, and the preheating temperature is 440-600 ℃; the raw material ingot is firstly dried, and the drying temperature is 100-200 ℃.
Further, in the step 1), in the Mg-RE intermediate alloy, the mass percentage content of RE is 20% -50%; in the Mg-Mn intermediate alloy, the mass percentage content of Mn is 10% -40%; in the Mg-Zr intermediate alloy, the mass percentage content of Zr is 10-40%.
Further, in the step 1), the standing temperature is 700-760 ℃ and the standing time is 30-90 min.
Further, the casting mold has a diameter of 100 to 200mm.
Further, in the step 2), the cast magnesium alloy ingot is cut, turned and polished.
Compared with the prior art, the invention has the beneficial effects that:
1) The chemical components of the rare earth magnesium alloy plate and strip take Al, zn and Gd as main elements, the components are required to meet the conditions of Gd/Al=1.0-5.0 and Gd/Zn=1.0-5.0, the elements are matched for application, the extensibility and the deep drawing performance of the magnesium alloy are obviously improved, the alloy component design is simple, and the cost is low.
2) The invention adopts smelting-semicontinuous casting-homogenization heat treatment, hot rolling cogging-temperature electric coupling rolling and annealing processes to prepare the rare earth magnesium alloy plate strip with good deep drawing performance, has simple process and strong operability, and can realize industrialized mass production.
3) The invention adopts the thermo-electric coupling rolling (the high-energy electric pulse coupling heating rolling process is simply called as 'thermo-electric coupling rolling', is a novel composite rolling process provided on the basis of traditional warm rolling and electro-plastic rolling) and an annealing process, realizes that the total deformation rate of the magnesium alloy is more than or equal to 70 percent at low temperature (less than or equal to 100 ℃), and compared with the traditional magnesium alloy adopting the hot rolling and annealing processes, avoids surface oxidation and high energy consumption caused by repeated heating, thereby reducing the production cost;
4) Under the coupling effect of thermal effect and non-thermal effect brought by the temperature electric coupling rolling and annealing effect, an additional recrystallization driving force is introduced, so that the total recrystallization driving force is increased, and the migration rate and nucleation rate of the grain boundary are improved; the magnesium alloy can cause local resistivity difference due to dislocation density non-uniformity after cold deformation, so that coupling effect generated by electric pulse action is non-uniformly distributed in a microscopic region, namely, the selection effect of electric pulse is promoted to preferentially nucleate and recrystallize in severe deformation regions such as twin crystals, shearing bands and the like, therefore, the application of temperature electric coupling rolling and annealing technology can obviously improve the microstructure of the deformed magnesium alloy, and further, the plastic deformation capability of the magnesium alloy at low temperature (less than or equal to 100 ℃) is greatly improved.
5) The rare earth magnesium alloy plate strip with good deep drawing performance prepared by the invention has the thickness of 1.0-3.0 mm, the total rolling deformation rate of more than or equal to 70%, the yield strength of more than or equal to 240MPa, the tensile strength of more than or equal to 360MPa, the elongation after fracture of more than or equal to 30%, the ultimate deep drawing ratio of LDR of more than or equal to 2.0, and the rare earth magnesium alloy plate strip has good comprehensive properties such as high strength, high plasticity, good deep drawing performance and the like.
Drawings
FIG. 1 is a photograph showing the microstructure of a rare earth magnesium alloy strip prepared in example 1 of the present invention.
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
The rare earth magnesium alloy plate strip with good deep drawing performance comprises the following components in percentage by mass: 0.5 to 6.0 percent of Al, 0.5 to 6.0 percent of Zn, 0.1 to 1.0 percent of Mn, 0.1 to 1.0 percent of Zr and 3.0 to 12.0 percent of RE, wherein the RE component takes Gd element as a main element, the proportion of the Gd element is 50 to 90 percent, the rest is more than one of La, ce, sm, nd, gd/Al is 1.0 to 5.0, and Gd/Zn is 1.0 to 5.0; the balance of Mg and a small amount of unavoidable impurities.
The preparation method of the rare earth magnesium alloy plate strip with good deep drawing performance comprises the following steps: smelting, semi-continuous casting, homogenizing heat treatment, hot rolling cogging, thermoelectric coupling rolling and annealing. The method comprises the following specific steps:
1) Smelting; firstly preheating a crucible, drying a raw material ingot and feeding; the preheating temperature of the crucible is 440-600 ℃, and the raw material ingot is fully dried at 100-200 ℃ to ensure the purity of the fused mass after smelting. According to the set mass fraction, firstly feeding industrial pure magnesium ingots, and introducing inert gas (preferably Ar gas) for protection and heating and melting. When the furnace temperature reaches 680-730 ℃, feeding industrial pure aluminum ingots and industrial pure zinc ingots, and when the furnace temperature is raised to 760-800 ℃, feeding Mg-RE intermediate alloy (RE mass percent content is 20-50%), mg-Mn intermediate alloy (Mn mass percent content is 10-40%) and Mg-Zr intermediate alloy (Zr mass percent content is 10-40%). And after all the materials are melted, deslagging treatment is carried out, and a layer of mixed residues of magnesium oxide and covering agent on the surface of the melt are removed. And then a refining agent is sprinkled into the melt for refining, wherein the refining temperature is 760-800 ℃, and the refining time is 20-40 min. Finally, the magnesium alloy liquid is obtained through deslagging and standing treatment, the standing temperature is 700-760 ℃, and the standing time is 30-90 min.
2) Casting; adopting a semi-continuous casting process, wherein the casting temperature is 700-760 ℃; the pulling speed of the cast ingot is 120-180 mm/min, and the size specification of the crystallizer is 100X 200mm. The obtained ingot needs to be cut into small ingots by a sawing machine, and the surfaces of the initial ingots are rough and also need to be polished.
3) Homogenizing heat treatment and hot rolling cogging; placing the magnesium alloy cast ingot into a heating furnace for homogenizing heat treatment, wherein the temperature of the heating furnace is 450-600 ℃, and the heat preservation time is 10-20 h; preheating a rolling mill roller to 250-350 ℃, and performing hot rolling cogging for multiple times to obtain the magnesium alloy plate with the thickness of 10-20 mm.
4) Performing temperature electric coupling rolling and annealing; the magnesium alloy plate is formed by thermal and electric coupling rolling, the roller of a rolling mill is preheated to 100-200 ℃, the rolling speed of the rolling mill is 10-50 m/min, the rolling passes are 3-15, the rolling reduction rate of single pass is 0-50%, and the total rolling deformation rate is more than or equal to 70%; wherein, the pass reduction rate is 0, namely the thermal-electric coupling annealing process. When in thermal-electric coupling rolling, the electric pulse frequency is 100-2000 Hz, the voltage is 10-100V, the pulse width is 50-120 mu s, the root mean square current density is 20-120A/mm 2, and the temperature of the magnesium alloy plate is less than or equal to 100 ℃; when in thermal-electric coupling annealing, the electric pulse frequency is 100-1000 Hz, the voltage is 20-70V, the pulse width is 50-120 mu s, the root mean square current density is 5-50A/mm 2, and the temperature of the magnesium alloy plate is less than or equal to 100 ℃.
Finally, the rare earth magnesium alloy plate strip with the thickness of 1.0-3.0 mm, the total rolling deformation rate of more than or equal to 70%, the yield strength of more than or equal to 240MPa, the tensile strength of more than or equal to 360MPa, the elongation after fracture of more than or equal to 30%, and the ultimate drawing ratio LDR of more than or equal to 2.0 is obtained, and the finished product shows the comprehensive properties of high strength, high plasticity, good drawing performance and the like.
The following examples are given by way of illustration of detailed embodiments and specific procedures based on the technical scheme of the present invention, but the scope of the present invention is not limited to the following examples.
[ Example ]
The chemical compositions of the rare earth magnesium alloy plate and strip in each example are shown in table 1, the smelting-casting-cogging process parameters in each example are shown in table 2, the electric pulse auxiliary rolling process parameters in each example are shown in table 3, and the electric pulse auxiliary annealing process parameters and product performances in each example are shown in table 4. FIG. 1 is a photograph showing the microstructure of a rare earth magnesium alloy strip prepared in example 1.
TABLE 1 chemical composition of rare earth magnesium alloy plate and strip (mass percent,%)
| Examples | Al | Zn | Mn | Zr | RE | Gd | La | Ce | Sm | Nd | Gd/Al | Gd/Al |
| 1 | 2.41 | 1.58 | 0.34 | 0.27 | 7.67 | 6.62 | - | 0.87 | 0.18 | - | 2.75 | 4.19 |
| 2 | 1.17 | 3.46 | 0.29 | 0.53 | 5.94 | 5.13 | 0.43 | - | 0.38 | - | 4.38 | 1.48 |
| 3 | 0.87 | 1.92 | 0.56 | 0.36 | 5.63 | 4.03 | - | 0.39 | - | 1.21 | 4.63 | 2.10 |
| 4 | 4.61 | 2.73 | 0.71 | 0.19 | 9.89 | 8.62 | - | - | - | 1.27 | 1.87 | 3.16 |
| 5 | 3.62 | 1.17 | 0.68 | 0.43 | 5.94 | 5.18 | - | - | 0.76 | - | 1.43 | 4.43 |
| 6 | 1.96 | 2.39 | 0.45 | 0.55 | 9.45 | 8.35 | 0.38 | 0.72 | - | - | 4.26 | 3.49 |
| 7 | 2.19 | 4.24 | 0.84 | 0.33 | 7.42 | 6.17 | - | 0.21 | 0.18 | 0.86 | 2.82 | 1.46 |
| 8 | 1.55 | 3.66 | 0.17 | 0.62 | 5.39 | 4.44 | 0.63 | - | 0.32 | - | 2.86 | 1.21 |
TABLE 2 smelting-casting-cogging process parameters
TABLE 3 technological parameters of temperature and electric coupling rolling
TABLE 4 Process parameters and product Performance for thermal and electrical coupling annealing
As can be seen from the above examples, the rare earth magnesium alloy plate strip with the thickness of 1.0-3.0 mm, the total rolling deformation rate of more than or equal to 70%, the yield strength of more than or equal to 240MPa, the tensile strength of more than or equal to 360MPa, the elongation after break of more than or equal to 30% and the ultimate drawing ratio LDR of more than or equal to 2.0 is prepared by adopting the chemical composition design of the invention and combining the smelting, casting, homogenizing heat treatment, hot rolling cogging, thermal electric coupling rolling and annealing processes, and the product exhibits good comprehensive properties such as high strength, high plasticity, good drawing performance and the like, and can meet the special requirements of industries such as automobiles, electronic communication, aerospace and the like on the magnesium alloy on high strength, high plasticity and higher drawing performance.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (9)
1. The rare earth magnesium alloy plate strip with good drawing performance is characterized by comprising the following components in percentage by mass: 0.5 to 6.0 percent of Al, 0.5 to 6.0 percent of Zn, 0.1 to 1.0 percent of Mn, 0.1 to 1.0 percent of Zr and 3.0 to 12.0 percent of RE; wherein, the proportion of Gd element in RE component is 50% -90%, the rest is more than one of La, ce, sm, nd, gd/Al is 1.0-5.0, gd/Zn is 1.0-5.0; the balance of Mg and unavoidable impurities.
2. The rare earth magnesium alloy sheet strip with good drawing performance according to claim 1, wherein the thickness of the finished rare earth magnesium alloy sheet strip is 1.0-3.0 mm.
3. The rare earth magnesium alloy sheet strip with good drawing performance according to claim 1, wherein the properties of the finished rare earth magnesium alloy sheet strip are: the yield strength is more than or equal to 240MPa, the tensile strength is more than or equal to 360MPa, the elongation after fracture is more than or equal to 30%, and the ultimate draw ratio LDR is more than or equal to 2.0.
4. The method for producing a rare earth magnesium alloy sheet strip with excellent drawing performance according to any one of claims 1 to 3, characterized in that the production process comprises melting, semi-continuous casting, homogenizing heat treatment and hot rolling cogging, thermo-electric coupling rolling and annealing; the preparation method comprises the following specific steps:
1) Smelting; according to the set mass percentage, firstly feeding industrial pure magnesium ingots into a crucible, and introducing inert gas for protection and heating and melting; feeding an industrial pure aluminum ingot and an industrial pure zinc ingot when the furnace temperature reaches 680-730 ℃, and feeding an Mg-RE intermediate alloy, an Mg-Mn intermediate alloy and an Mg-Zr intermediate alloy when the furnace temperature rises to 760-800 ℃; after the materials are completely melted, a refining agent is scattered into the melt for refining, wherein the refining temperature is 760-800 ℃, and the refining time is 20-40 min; then deslagging and standing to obtain magnesium alloy liquid;
2) Casting; casting the magnesium alloy liquid by adopting a semi-continuous casting process, wherein the casting temperature is 700-760 ℃; the pulling speed of the ingot is 120-180 mm/min, and a magnesium alloy ingot is obtained;
3) Homogenizing heat treatment and hot rolling cogging; placing the magnesium alloy cast ingot into a heating furnace for homogenizing heat treatment, wherein the temperature of the heating furnace is 450-600 ℃, and the heat preservation time is 10-20 h; adopting multi-pass hot rolling cogging to obtain magnesium alloy plate material with thickness of 10-20 mm; preheating a rolling mill roller to 250-350 ℃ before hot rolling and cogging;
4) Performing temperature electric coupling rolling and annealing; rolling magnesium alloy plate material by thermal-electric coupling, and preheating a rolling mill roller to 100-200 ℃ before the thermal-electric coupling rolling; the rolling speed of the rolling mill is 10-50 m/min, and the rolling passes are 3-15; the single-pass rolling reduction is 0-50%, and the total rolling deformation rate is more than or equal to 70%; wherein, when the rolling reduction rate of single pass is 0, the process is a thermal-electric coupling annealing process; when in thermal-electric coupling rolling, the electric pulse frequency is 100-2000 Hz, the voltage is 10-100V, the pulse width is 50-120 mu s, the root mean square current density is 20-120A/mm 2, and the temperature of the magnesium alloy plate is less than or equal to 100 ℃; when in thermal-electric coupling annealing, the electric pulse frequency is 100-1000 Hz, the voltage is 20-70V, the pulse width is 50-120 mu s, the root mean square current density is 5-50A/mm 2, and the temperature of the magnesium alloy plate is less than or equal to 100 ℃; and obtaining the rare earth magnesium alloy plate strip after the thermo-electric coupling rolling.
5. The method for preparing a rare earth magnesium alloy sheet strip with good drawing performance according to claim 4, wherein in the step 1), a crucible is preheated before smelting, and the preheating temperature is 440-600 ℃; the raw material ingot is firstly dried, and the drying temperature is 100-200 ℃.
6. The method for preparing a rare earth magnesium alloy sheet strip with good drawing performance according to claim 4, wherein in the step 1), the mass percentage content of RE in the Mg-RE intermediate alloy is 20% -50%; in the Mg-Mn intermediate alloy, the mass percentage content of Mn is 10% -40%; in the Mg-Zr intermediate alloy, the mass percentage content of Zr is 10-40%.
7. The method for producing a rare earth magnesium alloy sheet and strip with excellent drawing performance according to claim 4, wherein in said step 1), the standing temperature is 700 to 760 ℃ and the standing time is 30 to 90min.
8. The method for producing a rare earth magnesium alloy sheet and strip excellent in drawing performance according to claim 4, wherein the casting mold has a diameter of 100 to 200mm.
9. The method for producing a rare earth magnesium alloy sheet and strip with excellent drawing performance according to claim 4, wherein in said step 2), the cast magnesium alloy ingot is subjected to cutting and turning polishing treatment.
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