CN115627399B - Low-rare-earth high-strength Mg 98.5 Y 1 Zn 0.5 Preparation method of magnesium alloy - Google Patents
Low-rare-earth high-strength Mg 98.5 Y 1 Zn 0.5 Preparation method of magnesium alloy Download PDFInfo
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- 239000011777 magnesium Substances 0.000 title claims abstract description 35
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 34
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000001125 extrusion Methods 0.000 claims abstract description 69
- 239000011701 zinc Substances 0.000 claims abstract description 33
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 22
- 239000000956 alloy Substances 0.000 claims abstract description 22
- 238000005266 casting Methods 0.000 claims abstract description 18
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 12
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 10
- 238000007670 refining Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 16
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 239000000395 magnesium oxide Substances 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 7
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 239000006104 solid solution Substances 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 description 10
- 238000003756 stirring Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 239000003973 paint Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 244000137852 Petrea volubilis Species 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000002519 antifouling agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002828 effect on organs or tissue Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 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
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/001—Extruding metal; Impact extrusion to improve the material properties, e.g. lateral extrusion
-
- 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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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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)
- Extrusion Of Metal (AREA)
Abstract
The invention discloses a low rare earth high strength Mg 98.5 Y 1 Zn 0.5 A preparation method of magnesium alloy, belonging to the technical field of high-strength magnesium alloy preparation; the method comprises the following steps: according to Mg 98.5 Y 1 Zn 0.5 Preparing pure magnesium, pure zinc and Mg-30Y intermediate alloy from alloy components; sequentially adding pure zinc and Mg-30Y intermediate alloy into the melted magnesium ingot for refining and pouring; carrying out solution treatment on the casting piece obtained by casting, wherein the temperature of the solution treatment is 530-550 ℃; performing forward extrusion on the test piece subjected to solution treatment; the extrusion temperature of the forward extrusion is 380-420 ℃; the extrusion speed is 0.3-0.5mm/s, the extrusion ratio is 23-26:1, and the extrusion angle is 30-40 degrees; the low rare earth high strength Mg prepared by the invention 98.5 Y 1 Zn 0.5 The comprehensive performance index of the toughness level of the magnesium alloy is obviously improved; meanwhile, the cost of the rare earth magnesium alloy is reduced.
Description
Technical Field
The invention belongs to the technical field of preparation of high-strength magnesium alloy, and relates to a low-rare-earth high-strength Mg 98.5 Y 1 Zn 0.5 A preparation method of magnesium alloy.
Background
With the exhaustion of energy sources, the demand for weight reduction is increasing in the fields of aviation, aerospace, automobiles and the like, and magnesium alloy has been expected to be a lightest structural material because of its advantages of high specific strength, high specific stiffness, good electrical conductivity, electromagnetic shielding, easy processing and forming and the like. However, with the development of science and technology, higher requirements are put on the performance of materials, and the magnesium alloy has the defects of low absolute strength, low plasticity, poor high-temperature performance and the like, so that the application of the magnesium alloy is severely limited.
Through continuous efforts of researchers, a series of high-performance magnesium alloys, particularly rare earth magnesium alloys, such as WE43 developed abroad, mg-Gd-Y series magnesium alloys developed at home and the like, have been developed at present, and have excellent mechanical properties. In particular, the extruded WE43 magnesium alloy has an elongation of 20% or more, but has a low tensile strength of about 225 MPa. In addition, the tensile strength of the high-strength as-cast Mg-14Gd-3Y-1.8Zn-0.5Zr magnesium alloy developed by Song Zhang et al can reach 366MPa, but the elongation is extremely low, only 2.8%, but the rare earth content is up to 17%. At present, in the process of developing magnesium alloy, on the premise of ensuring high strength and high plasticity, reducing the usage amount of rare earth is still a hot topic.
The addition of Zn element in Mg-Re system can form Long Period Stacking Ordered (LPSO) special structure, wherein rare earth Gd and Y are mainly added, but compared with Y, gd has larger relative atomic mass, and the requirement of light weight cannot be met. LPSO exists in a variety of structures, with 18R-LPSO and 14H-LPSO being most common. The 18R-LPSO is of a block structure, has high strength and high hardness, is a hard and brittle phase, is easy to cause stress concentration in the stress process, causes microcrack formation, and has adverse effects on tissues; 14H-LPSO is a stacked layered structure with high strength and good toughness, which is an advantageous structure. 18R-LPSO is generally formed in the as-cast state, whereas 14H-LPSO is formed only by solid phase transformation. In the heat treatment process, when the temperature is lower than 500 ℃, the treatment time is long, the growth of crystal grains is easy to be caused, and the conversion from 18R-LPSO to 14H-LPSO is incomplete; when the temperature is higher than 500 ℃, alloy burnout is liable to occur.
Forward extrusion is a common method for improving the mechanical properties of magnesium alloys. A large number of fine dynamic recrystallization grains can be obtained through forward extrusion, and the structure can be improved to a certain extent, shrinkage porosity and shrinkage cavity can be reduced, and the structure is compact. At present, forward extrusion is mainly concentrated in 300-400 ℃, when the extrusion temperature is lower than 250 ℃, the forward extrusion is easy to cause workpiece cracking in the extrusion process, and a large amount of internal stress is formed, so that plasticity is reduced.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a low rare earth high strength Mg 98.5 Y 1 Zn 0.5 A preparation method of magnesium alloy. In order to achieve the above purpose, the present invention is realized by the following technical scheme.
Low-rare-earth high-strength Mg 98.5 Y 1 Zn 0.5 The preparation method of the magnesium alloy comprises the following steps:
1) According to Mg 98.5 Y 1 Zn 0.5 Preparing pure magnesium, pure zinc and Mg-30Y intermediate alloy from alloy components;
2) Sequentially adding pure zinc and Mg-30Y intermediate alloy into the melted magnesium ingot for refining and pouring;
3) Carrying out solution treatment on the casting piece obtained by casting, wherein the temperature of the solution treatment is 530-550 ℃;
4) Performing forward extrusion on the test piece subjected to solution treatment; the extrusion temperature of the forward extrusion is 380-420 ℃; the extrusion speed is 0.3-0.5mm/s, the extrusion ratio is 23-26:1, and the extrusion angle is 30-40 degrees.
Preferably, the extrusion temperature of the forward extrusion is 400 ℃; extrusion speed 0.4mm/s, extrusion ratio 25:1, extrusion angle 30 deg.
Preferably, the refining is to cut off the power supply after the furnace temperature is kept at 780 ℃ for 15 min, and to take off the slag on the surface of the molten liquid and refine after the temperature is reduced to 750 ℃; and then, uniformly spreading a covering agent, closing a furnace cover, and preserving heat for 20 min at the furnace temperature of 750 ℃.
Preferably, the casting is to cast the magnesium alloy melt into a preheated die after slag skimming after heat preservation is carried out for 20 min at 750 ℃; after the mold temperature was naturally cooled to room temperature, the sample was taken out of the mold to obtain a casting rod having a diameter of 80 mm.
Preferably, the casting piece obtained by casting and the dried magnesia powder are jointly wrapped in tinfoil for compaction, and then are put into a ceramic pot; and then wrapping the ceramic tank with tinfoil, finally placing the ceramic tank in an iron tank, filling magnesia powder around the ceramic tank, compacting, and then placing the wrapped test piece in a heat treatment furnace for solid solution treatment.
Preferably, the temperature of the solution treatment is 530 ℃; and incubated for 10 hours, and then cooled to room temperature with the oven.
Preferably, the forward extrusion is to heat a heat treatment furnace to extrusion temperature, and after the temperature is reached, putting the test piece subjected to solution treatment into the furnace, and preserving the heat for 1 hour; and when the die reaches the extrusion temperature, the test piece reaches the heat preservation time, the power supply is disconnected, and the test piece is put into the die for extrusion.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts low rare earth, converts more 18R-LPSO into 14H-LPSO through high temperature and short time solid solution, simultaneously overcomes the problems of incomplete conversion and grain growth, and then obtains a large number of fine dynamic recrystallization grains through high temperature forward extrusion, reduces internal stress, improves the plasticity of alloy, thereby obtaining the low rare earth high strength Mg 98.5 Y 1 Zn 0.5 Magnesium alloy. The low rare earth high strength Mg prepared by the invention 98.5 Y 1 Zn 0.5 The extrusion temperature of the magnesium alloy is controlled at 400 ℃, the tensile strength is 330.6MPa, and the elongation is 12.8%; the comprehensive performance index representing the toughness level of the magnesium alloy is obviously improved. Meanwhile, the Mg of the invention 98.5 Y 1 Zn 0.5 The rare earth metal adopted by the magnesium alloy is obviously reduced, and the cost of the magnesium alloy is reduced.
Drawings
FIG. 1 is a solid solution Mg 98.5 Y 1 Zn 0.5 Alloy OM microstructural map.
FIG. 2 is a schematic illustration of a forward extrusion process; wherein: 1-a male die; 2-a gasket; 3-female die; 4-sample before extrusion; 5-extruding the sample; the thickness of the sample before extrusion is 30mm, and the diameter is 40mm; the diameter of the extruded sample was 8mm.
FIG. 3 is an extruded Mg 98.5 Y 1 Zn 0.5 Room temperature tensile stress-strain curves for the alloy at different extrusion parameters.
FIG. 4 is an extruded Mg 98.5 Y 1 Zn 0.5 SEM microstructure of the alloy under different extrusion parameters; wherein: (a) Extrusion temperature part of (c), (e)380 ℃,400 ℃ and 420 ℃ respectively; (b) And (d) and (f) are enlarged views of region 1 in the drawing (a), region 2 in the drawing (c) and region 3 in the drawing (e), respectively.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail by combining the embodiments and the drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. The following describes the technical scheme of the present invention in detail with reference to examples and drawings, but the scope of protection is not limited thereto.
Example 1
Designing alloy components: this example uses magnesium ingots of 99.99 wt% purity, mg-30Y master alloy, zinc of 99.99 wt% purity, and capping and refining agents. Smelting is carried out once for 1500g, wherein the Mg is 1303.8g, the Zn is 19.5g, the Mg-30Y master alloy is 176.7g, and a small amount of covering agent and refining agent, mg 98.5 Y 1 Zn 0.5 The alloy compositions are shown in Table 1.
Step 1, alloy smelting
Before smelting, the raw materials, the mould, the stirring rod and the slag removing rod are required to be preheated, the mould, the stirring rod and the slag removing rod are all made of steel materials, and in order to facilitate demoulding of castings and prevent impurities from being brought in, a mould inner wall is required to be sprayed with a mould release agent, and the mould is cleaned before spraying; in order to prevent the oxidation layer on the surfaces of the stirring rod and the slag removing rod from falling off and bringing impurities into use, the surfaces of the stirring rod and the slag removing rod are required to be coated with protective paint, the paint is a mixed solution of talcum powder, water glass and water, the stirring rod and the slag removing rod are firstly heated to 400 ℃, then the surfaces of the stirring rod and the slag removing rod are uniformly coated with the paint, the heat is preserved, and the paint is coated after the paint is dried for 3-4 times, so that the paint is firmly adhered on the surfaces of the stirring rod and the slag removing rod. In order to facilitate the addition of raw materials and reduce the introduction of impurities, the intermediate alloy of pure magnesium, pure zinc and Mg-30Y is cut into blocks with proper sizes, and oxide film impurities on the surfaces are polished clean by sand paper.
1) Molten magnesium ingot
When the temperature of the resistance furnace is raised to 500 ℃, the preheated pure magnesium ingot is added into a crucible, the preheated covering agent is uniformly spread on the surface of the crucible, and simultaneously argon is introduced into a hearth for gas protection, because Mg is very easy to react with O in the air at high temperature 2 、N 2 And steam, the present example is protected by a method of covering agent and argon protection. When the temperature of the resistance furnace is raised to 720 ℃, the temperature is kept for 20 minutes at a constant temperature, so that the magnesium ingot can be completely melted.
2) Zinc addition
After the magnesium ingot is completely melted, the furnace cover is opened to carry out slag skimming, then preheated pure zinc is added, the covering agent is uniformly spread, and then the furnace cover is closed to start heating to 780 ℃.
3) Mg-30Y intermediate alloy
When the temperature is increased to 780 ℃, opening a furnace to remove slag, adding the preheated Mg-30Y intermediate alloy according to the test requirement, scattering a covering agent after stirring, closing a furnace cover, and keeping the temperature for 15 min after the furnace temperature is increased to 780 ℃.
4) Refining
After the furnace temperature is kept at 780 ℃ for 15 min, the power supply is disconnected, and when the temperature is reduced to 750 ℃, slag on the surface of the molten liquid is scraped off, and refining is carried out. Finally, after uniformly spreading the covering agent, closing a furnace cover, and preserving heat for 20 min at the furnace temperature of 750 ℃.
5) Pouring
After heat preservation for 20 min at 750 ℃, the magnesium alloy melt is poured into a preheated mould (200 ℃) after slag skimming. After the mold temperature was naturally cooled to room temperature, the sample was taken out of the mold to obtain a casting rod having a diameter of 80 mm.
Step 2, solution treatment
1) Cutting the casting rod obtained by casting into a cylinder with the diameter of 40 multiplied by 30mm by using a wire electric discharge machine, and polishing off a surface oxide layer by using abrasive cloth;
2) The magnesia powder was placed in a drying oven and dried at 200 ℃ for 2 hours in order to prevent water vapor from being carried in during the subsequent heat treatment;
3) After the magnesium oxide powder is dried, wrapping the cut pouring rod and the magnesium oxide powder by using tinfoil, compacting, then placing the pouring rod and the magnesium oxide powder into a ceramic pot, filling the periphery with the magnesium oxide powder and compacting, wrapping the ceramic pot with the tinfoil, finally placing the ceramic pot into an iron pot, filling the periphery of the ceramic pot with the magnesium oxide powder and compacting, covering the top of the iron pot with the tinfoil, and pricking a plurality of small holes for ventilation. The heat treatment piece is tightly wrapped by magnesia powder to prevent air and water vapor from entering and uniformly heated to prevent the piece from being burnt due to too high temperature;
4) Placing the wrapped piece into a heat treatment furnace, heating to 530 ℃ along with the furnace, preserving heat for 10 hours, and then cooling to room temperature along with the furnace;
5) And after the furnace is cooled to room temperature, taking out the piece, cleaning the piece, polishing the surface oxide layer by sand paper, and carrying out solution treatment, wherein the OM diagram is shown in figure 1.
Step 3, forward extrusion
1) After the die is assembled, heating the grinding tool by using a resistance furnace, and heating the grinding tool to an extrusion temperature;
2) Heating the heat treatment furnace to the extrusion temperature of 380 ℃ while heating the die, rapidly putting the solid solution treated piece into the furnace after the temperature is reached, and preserving the heat for 1 hour;
3) When the die reaches extrusion temperature, the heat treatment piece reaches heat preservation time, the power supply is disconnected, the extrusion piece is rapidly placed in the die, and the gasket and the extrusion rod are placed;
4) After the extrusion piece is placed, extruding at an extrusion speed of 0.4mm/s, an extrusion ratio of 25:1 and an extrusion angle of 30 degrees;
5) After the extrusion was completed, the extrusion was taken out and air-cooled to room temperature to obtain an elongated extrusion rod having a diameter of 8mm, and the forward extrusion process was as shown in FIG. 2. The diameter of the punch 1 used was 38mm and the thickness of the shim 2 was 10mm.
Example 2
This example is identical to the process and materials of example 1, except that the extrusion temperature is 400 ℃.
Example 3
This example is identical to the process and materials of example 1, except that the extrusion temperature is 420 ℃.
Experimental results of magnesium alloy properties prepared in examples 1 to 3:
examples 1 to 3 used three extrusion temperatures, the melting process and the solution treatment process used in the three methods all used the processes described above, except that the extrusion temperatures were 380℃and 400℃and 420℃for the respective examples 1 to 3, the extrusion speeds were 0.4mm/s, and the extrusion angles were 30 o The extrusion ratio was 25:1. When extruded at 380 ℃, the tensile strength is 339.5MPa, and the elongation is 7.5%; when extruded at 400 ℃, the tensile strength is 330.6MPa, and the elongation is 12.8%; the tensile strength at 420℃was 231.7MPa and the elongation was 17.6%, and the room temperature tensile stress-strain curve and the tensile strength and elongation of the alloy are shown in FIG. 3 and Table 2.
When the material is extruded at 380 ℃, the tensile strength is up to 339.5MPa, but the elongation is 7.5%; the tensile strength was the lowest at 420℃and 231.7MPa, but the elongation was the highest, at 17.6%. According to the product of strength and elongation (the product of strength and elongation is a comprehensive performance index representing the toughness level of the metal material, namely tensile strength is the elongation), the comprehensive performance at 400 ℃ is the best, the secondary at 420 ℃ is the lowest, and the 380 ℃ is the lowest.
The strength gradually decreases with increasing extrusion temperature, but the plasticity increases significantly, because the more complete dynamic recrystallization occurs with increasing extrusion temperature, the more recrystallized grains are particularly fine, which results in fine grain strengthening, not only in increasing strength but also in increasing plasticity, but also in decreasing strength with increasing extrusion temperature, as shown in fig. 4.
While the invention has been described in detail in connection with specific preferred embodiments thereof, it is not to be construed as limited thereto, but rather as a result of a simple deduction or substitution by a person having ordinary skill in the art to which the invention pertains without departing from the scope of the invention defined by the appended claims.
Claims (5)
1. Low-rare-earth high-strength Mg 98.5 Y 1 Zn 0.5 The preparation method of the magnesium alloy is characterized by comprising the following steps:
1) According to Mg 98.5 Y 1 Zn 0.5 Preparing pure magnesium, pure zinc and Mg-30Y intermediate alloy from alloy components;
2) Sequentially adding pure zinc and Mg-30Y intermediate alloy into the melted magnesium ingot for refining and pouring;
3) Carrying out solution treatment on the casting piece obtained by casting, wherein the temperature of the solution treatment is 530 ℃; preserving heat for 10 hours, and then cooling to room temperature along with a furnace;
4) Performing forward extrusion on the test piece subjected to solution treatment; the extrusion temperature of the forward extrusion is 400 ℃; extrusion speed 0.4mm/s, extrusion ratio 25:1, extrusion angle 30 deg.
2. A low rare earth high strength Mg according to claim 1 98.5 Y 1 Zn 0.5 The preparation method of the magnesium alloy is characterized in that the refining is to cut off the power supply after the furnace temperature is kept at 780 ℃ for 15 min, and to take off the slag on the surface of the molten liquid and refine after the temperature is reduced to 750 ℃; and then, uniformly spreading a covering agent, closing a furnace cover, and preserving heat for 20 min at the furnace temperature of 750 ℃.
3. A low rare earth high strength Mg according to claim 1 98.5 Y 1 Zn 0.5 The preparation method of the magnesium alloy is characterized in that the casting is that after heat preservation is carried out for 20 min at 750 ℃, the magnesium alloy melt is cast into a preheated mould after slag skimming; after the mold temperature was naturally cooled to room temperature, the sample was taken out of the mold to obtain a casting rod having a diameter of 80 mm.
4.A low rare earth high strength Mg according to claim 1 98.5 Y 1 Zn 0.5 The preparation method of the magnesium alloy is characterized in that a casting piece obtained by casting and dried magnesium oxide powder are wrapped in tinfoil together and compacted, and then the ceramic pot is placed; and then wrapping the ceramic tank with tinfoil, finally placing the ceramic tank in an iron tank, filling magnesia powder around the ceramic tank, compacting, and then placing the wrapped test piece in a heat treatment furnace for solid solution treatment.
5. A low rare earth high strength Mg according to claim 1 98.5 Y 1 Zn 0.5 The preparation method of the magnesium alloy is characterized in that the forward extrusion is that a heat treatment furnace is heated to extrusion temperature, and after the temperature reaches, a test piece after solution treatment is put into the furnace and is kept for 1 hour; and when the die reaches the extrusion temperature, the test piece reaches the heat preservation time, the power supply is disconnected, and the test piece is put into the die for extrusion.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211427509.5A CN115627399B (en) | 2022-11-15 | 2022-11-15 | Low-rare-earth high-strength Mg 98.5 Y 1 Zn 0.5 Preparation method of magnesium alloy |
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| CN202211427509.5A CN115627399B (en) | 2022-11-15 | 2022-11-15 | Low-rare-earth high-strength Mg 98.5 Y 1 Zn 0.5 Preparation method of magnesium alloy |
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| Publication Number | Publication Date |
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| CN115627399A CN115627399A (en) | 2023-01-20 |
| CN115627399B true CN115627399B (en) | 2023-11-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101560622A (en) * | 2009-05-21 | 2009-10-21 | 上海交通大学 | Method for enhancing Mg97Y2Zn1 alloy by adding zirconium |
| CN102492883A (en) * | 2011-12-28 | 2012-06-13 | 东北大学 | Magnesium alloy possessing extruding characteristic at room temperature and method for preparing extrusion material |
| CN107774732A (en) * | 2017-10-27 | 2018-03-09 | 西南交通大学 | A kind of method that reciprocating extrusion prepares nanometer quasi-crystalline substance enhancing Mg Zn y alloys |
| CN114032407A (en) * | 2021-11-10 | 2022-02-11 | 中北大学 | High-strength high-toughness Mg for engineering structural member89Y4Zn2Li5Preparation method of wrought magnesium alloy |
| CN114045408A (en) * | 2021-11-10 | 2022-02-15 | 中北大学 | Preparation method of high-performance Mg-Y-Zn-Li magnesium alloy suitable for engineering structural member |
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| CN106756370A (en) * | 2016-12-10 | 2017-05-31 | 哈尔滨工业大学 | A kind of anti-flaming Mg Gd Y Zn Zr alloys of high-strength anticorrosion and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101560622A (en) * | 2009-05-21 | 2009-10-21 | 上海交通大学 | Method for enhancing Mg97Y2Zn1 alloy by adding zirconium |
| CN102492883A (en) * | 2011-12-28 | 2012-06-13 | 东北大学 | Magnesium alloy possessing extruding characteristic at room temperature and method for preparing extrusion material |
| CN107774732A (en) * | 2017-10-27 | 2018-03-09 | 西南交通大学 | A kind of method that reciprocating extrusion prepares nanometer quasi-crystalline substance enhancing Mg Zn y alloys |
| CN114032407A (en) * | 2021-11-10 | 2022-02-11 | 中北大学 | High-strength high-toughness Mg for engineering structural member89Y4Zn2Li5Preparation method of wrought magnesium alloy |
| CN114045408A (en) * | 2021-11-10 | 2022-02-15 | 中北大学 | Preparation method of high-performance Mg-Y-Zn-Li magnesium alloy suitable for engineering structural member |
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