CN116555650A - High-strength high-toughness deformation flame-retardant magnesium alloy and preparation method and application thereof - Google Patents
High-strength high-toughness deformation flame-retardant magnesium alloy and preparation method and application thereof Download PDFInfo
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- CN116555650A CN116555650A CN202310616590.XA CN202310616590A CN116555650A CN 116555650 A CN116555650 A CN 116555650A CN 202310616590 A CN202310616590 A CN 202310616590A CN 116555650 A CN116555650 A CN 116555650A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 62
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000003063 flame retardant Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000011777 magnesium Substances 0.000 claims abstract description 25
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052718 tin Inorganic materials 0.000 claims abstract description 5
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 5
- 239000000956 alloy Substances 0.000 claims description 36
- 229910045601 alloy Inorganic materials 0.000 claims description 35
- 239000006104 solid solution Substances 0.000 claims description 15
- 229910018503 SF6 Inorganic materials 0.000 claims description 12
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 12
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 6
- 238000001192 hot extrusion Methods 0.000 claims description 6
- 238000010791 quenching Methods 0.000 claims description 6
- 230000000171 quenching effect Effects 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 4
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 238000012360 testing method Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000243 solution 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
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
-
- 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
-
- 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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
-
- 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
Abstract
The invention belongs to the technical field of magnesium alloy, and discloses a high-strength high-toughness deformation flame-retardant magnesium alloy, a preparation method and application thereof. The magnesium alloy comprises, based on the total weight of the magnesium alloy: 5.0 to 7.0 weight percent of Al, 2.0 to 4.0 weight percent of Ca, 0 to 3.0 weight percent of Zn, 0 to 3.0 weight percent of Sn, 0.4 to 0.7 weight percent of Mn, less than 0.01 weight percent of impurity element and the balance of Mg. The invention develops the high-strength high-toughness wrought magnesium alloy which is required by rail transit, does not contain rare earth elements and has higher ignition point, and solves the problems of high cost and insufficient ignition point of the existing flame-retardant magnesium alloy.
Description
Technical Field
The invention belongs to the technical field of magnesium alloy, and particularly relates to a high-strength high-toughness deformation flame-retardant magnesium alloy, a preparation method and application thereof.
Background
Magnesium alloys are the lightest metallic structural materials, with many advantages, such as: the magnesium alloy has the advantages of high specific strength, high specific rigidity, good casting performance, good electric conduction and thermal conductivity, good electromagnetic shielding performance, excellent cutting processability and easy recycling, and can be widely applied to the fields of electronics, automobiles, aerospace and the like.
At present, in the field of rail transit, in order to realize the light weight of a vehicle body structure, a magnesium alloy material with small density is the most effective way, but the magnesium alloy is a very active metal material, and the magnesium alloy is required to have flame retardance in practical application, but the current commercial magnesium alloy brand alloy has lower ignition point and has no practical application value on the rail transit vehicle body section. Therefore, there is a need to develop a wrought magnesium alloy with excellent combination of high strength, high toughness and high fire point.
Most of the currently reported flame-retardant magnesium alloys are basically added with various RE rare earth elements: the micro-alloyed high-strength plastic flame-retardant magnesium alloy disclosed in CN 114934218A comprises the following components: al:0.5-2.0%, ca:0.5-2.5%, gd:0.5-1.0%, zr:0.2-1.0%, wherein the impurity elements comprise less than 0.005% of Fe, less than 0.015% of Cu, less than 0.002% of Ni and the balance of Mg; the room temperature tensile strength reaches 300-380MPa, the yield strength is 200-320MPa, the elongation is 10-18%, and the alloy ignition point reaches 780 ℃. Wherein Gd is rare earth element, the cost is high, and the ignition point is 780 ℃ and does not meet the practical application.
The Mg-Al-Ca series alloy has the advantages of low cost, high strength, high ignition point and the like, is a good choice as a deformation flame-retardant magnesium alloy, and the ignition point in the Mg-Al-Ca series alloy is mainly determined by the content of Ca, but the plasticity of the alloy is poor along with the increase of the content of Ca, which is also unfavorable for practical application.
Therefore, there is a need to propose a wrought magnesium alloy having both high strength and high plasticity at a high ignition point based on Mg-Al-Ca based alloys.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a high-strength high-toughness deformation flame-retardant magnesium alloy, a preparation method and application thereof. The invention develops the high-strength high-toughness wrought magnesium alloy which is required by rail transit, does not contain rare earth elements and has higher ignition point, and solves the problems of high cost and insufficient ignition point of the existing flame-retardant magnesium alloy.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a high-strength high-toughness wrought flame-retardant magnesium alloy comprising, based on the total weight of the magnesium alloy: 5.0 to 7.0 weight percent of Al, 2.0 to 4.0 weight percent of Ca, 0 to 3.0 weight percent of Zn, 0 to 3.0 weight percent of Sn, 0.4 to 0.7 weight percent of Mn, less than 0.01 weight percent of impurity element and the balance of Mg.
According to the present invention, preferably, the magnesium alloy includes, based on the total weight of the magnesium alloy: 5.0 to 7.0 weight percent of Al, 2.0 to 4.0 weight percent of Ca, 1.0 to 3.0 weight percent of Zn, 1.0 to 3.0 weight percent of Sn, 0.4 to 0.7 weight percent of Mn, less than 0.01 weight percent of impurity elements and the balance of Mg.
According to the invention, preferably, the high-strength high-toughness deformation flame-retardant magnesium alloy has tensile strength of 292MPa or more, yield strength of 190MPa or more, elongation of 9% or more and ignition point of 900 ℃ or more.
The second aspect of the invention provides a preparation method of the high-strength high-toughness deformation flame-retardant magnesium alloy, which comprises the following steps:
s1: polishing and first preheating treatment are carried out on pure Mg, pure Al, mg-25wt% Ca master alloy, mg-10wt% Mn master alloy, optional pure Zn and optional pure Sn;
s2: the pure Mg, pure Al, mg-25wt% Ca master alloy, mg-10wt% Mn master alloy, optional pure Zn and optional pure Sn treated in step S1 are mixed in CO 2 And SF (sulfur hexafluoride) 6 Is mixed and smelted under the protection of mixed gas, and is stirred and deflashing in sequenceSlag and heat preservation treatment are carried out to obtain alloy melt;
s3: cooling the alloy melt to obtain an ingot and removing the surface layer of the ingot;
s4: sequentially carrying out first solid solution treatment, second solid solution treatment, quenching treatment and second preheating treatment on the surface-removed cast ingot obtained in the step S3 to obtain a preheated cast ingot;
s5: and carrying out hot extrusion treatment on the preheated cast ingot to obtain the bar of the high-strength high-toughness deformation flame-retardant magnesium alloy.
The invention effectively improves the ignition point of the alloy by adding Ca element, and the alloy has very high ignition point when the Ca content reaches 3 wt%. However, when the Ca content exceeds 1wt%, a large amount of the second phase is present in the alloy, which results in poor plasticity, and therefore, in the present invention, the content of the second phase is reduced by the solution treatment twice, so that a magnesium alloy having excellent room temperature mechanical properties is obtained. Therefore, the extruded magnesium alloy has the room temperature tensile strength of 292MPa or more, the room temperature yield strength of 190MPa or more and the elongation of 9% or more, and has good room temperature mechanical property and flame retardant property.
In the present invention, as a preferable mode, in step S2, pure Mg treated in step S1 is put into an iron crucible so that the pure Mg is in CO 2 And SF (sulfur hexafluoride) 6 All melt in the resistance furnace under the protection of the mixed gas to obtain liquid pure Mg; sequentially placing pure Al, mg-25wt% Ca master alloy, mg-10wt% Mn master alloy, optional pure Zn and optional pure Sn into an iron crucible containing liquid pure Mg, and adding CO 2 And SF (sulfur hexafluoride) 6 And (3) carrying out mixed smelting under the protection of mixed gas, completely melting the alloy, and sequentially carrying out stirring, removing surface scum and heat preservation treatment to obtain an alloy melt.
According to the present invention, preferably, in step S1, the content of Mg in the pure Mg is not less than 99.98wt%, the content of Al in the pure Al is not less than 99.98wt%, the content of Zn in the pure Zn is not less than 99.97wt%, and the content of Sn in the pure Sn is not less than 99.98wt%.
According to the present invention, preferably, in step S2:
the CO 2 And SF (sulfur hexafluoride) 6 CO in a mixed gas of (a) 2 And SF (sulfur hexafluoride) 6 The volume ratio of (99.4-99.6): (0.4-0.6);
the temperature of the mixed smelting is 700-800 ℃ and the time is 15-25min;
the stirring treatment time is 1-3min;
the heat preservation treatment time is 15-25min.
According to the invention, preferably, in step S3, the alloy melt is cooled to 20-30 ℃.
According to the present invention, preferably, in step S4:
the temperature of the first solid solution treatment is 350-450 ℃ and the time is 12-18h;
the temperature of the second solid solution treatment is 460-550 ℃ and the time is 36-60h;
the quenching treatment comprises the steps of putting the cast ingot subjected to the second solid solution treatment into water with the temperature of 40-60 ℃ and cooling to 20-30 ℃;
the temperature of the second preheating treatment is 300-400 ℃ and the time is 0.5-1.5h.
According to the present invention, preferably, in the step S5, the extrusion temperature of the hot extrusion treatment is 300 to 400℃and the extrusion speed is 0.1 to 0.15mm/S, and the extrusion ratio is (10-14): 1.
According to the invention, the diameter of the bar is preferably 8-12mm.
The third aspect of the invention provides application of the high-strength high-toughness deformation flame-retardant magnesium alloy as a structural section of a rail transit vehicle body.
The technical scheme of the invention has the following beneficial effects:
1. the flame-retardant magnesium alloy disclosed by the invention is free from adding rare earth elements, has lower cost, has higher ignition point, and simultaneously has excellent room-temperature mechanical properties, and has great significance for further lightening rail transit.
2. The flame-retardant magnesium alloy prepared by the method has higher ignition point, does not burn at 900 ℃, and has good flame-retardant property; meanwhile, the extruded magnesium alloy has the room temperature tensile strength of 292MPa or more, the room temperature yield strength of 190MPa or more and the elongation of 9% or more, and has good room temperature mechanical property and flame retardant property.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
Fig. 1 shows a microstructure image of a high strength, high toughness, deformed, flame retardant magnesium alloy of example 1 of the present invention.
Fig. 2 shows a microstructure image of a high strength, high toughness, deformed, flame retardant magnesium alloy of example 3 of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
The embodiment provides a high-strength high-toughness deformation flame-retardant magnesium alloy, which comprises the following components in percentage by weight: 5.03wt% of Al, 2.55wt% of Ca, 1.55wt% of Zn, 0wt% of Sn, 0.65wt% of Mn and 90.22wt% of Mg.
The preparation method of the high-strength high-toughness deformation flame-retardant magnesium alloy comprises the following steps:
s1: grinding pure Mg, pure Al, mg-25wt% Ca intermediate alloy, mg-10wt% Mn intermediate alloy and pure Zn to remove oxide scale, and performing primary preheating treatment;
s2: placing pure Mg treated in the step S1 into an iron crucible, and enabling the pure Mg to be in CO 2 And SF (sulfur hexafluoride) 6 Is protected by the mixed gas of (a)Completely melting in a resistance furnace at 750 ℃ to obtain liquid pure Mg; sequentially placing pure Al, mg-25wt% Ca intermediate alloy, mg-10wt% Mn intermediate alloy and pure Zn into an iron crucible containing liquid pure Mg, and adding CO 2 And SF (sulfur hexafluoride) 6 Carrying out mixed smelting for 20min under the protection of mixed gas, fully melting alloy, stirring for 1-3min, removing surface scum and preserving heat for 10-20min in sequence to obtain alloy melt;
the CO 2 And SF (sulfur hexafluoride) 6 CO in a mixed gas of (a) 2 And SF (sulfur hexafluoride) 6 Is 99.5:0.5;
s3: taking out the alloy melt from the resistance furnace, pouring the alloy melt into a graphite crucible, cooling to room temperature, obtaining an ingot and removing the surface layer of the ingot;
s4: sequentially carrying out first solid solution treatment, second solid solution treatment, quenching treatment and second preheating treatment on the surface-removed cast ingot obtained in the step S3 to obtain a preheated cast ingot;
the temperature of the first solid solution treatment is 403 ℃ and the time is 16h;
the temperature of the second solid solution treatment is 500 ℃ and the time is 48 hours;
the quenching treatment comprises the steps of putting the cast ingot subjected to the second solid solution treatment into warm water and cooling to room temperature;
the temperature of the second preheating treatment is 350 ℃ and the time is 1h;
s5: and carrying out hot extrusion treatment on the preheated cast ingot to obtain the bar of the high-strength high-toughness deformed flame-retardant magnesium alloy, wherein the extrusion temperature of the hot extrusion treatment is 350 ℃, the extrusion speed is 0.1mm/s, the extrusion ratio is 12:1, and the diameter of the bar is 10mm.
Examples 2 to 4
Examples 2-4 provide a high strength, high toughness, wrought flame retardant magnesium alloy, examples 2-4 differ from example 1 only in that: the percentages of the metal elements are different, and are shown in table 1.
TABLE 1
| Examples | Al/wt％ | Ca/wt％ | Zn/wt％ | Sn/wt％ | Mn/wt％ | Mg/wt％ |
| Example 1 | 5.03 | 2.55 | 1.55 | 0 | 0.65 | 90.22 |
| Example 2 | 5.14 | 3.00 | 2.54 | 0 | 0.51 | 88.81 |
| Example 3 | 6.59 | 3.65 | 0 | 1.99 | 0.67 | 87.1 |
| Example 4 | 6.85 | 3.73 | 0 | 2.95 | 0.62 | 85.85 |
Test example 1
The bars phi 10mm x 10mm of the high strength and high toughness deformed flame retardant magnesium alloys of examples 1-4 were used for fire point testing (the testing method is one known to those skilled in the art and easy to implement), and the M10 tensile bars were used for mechanical property testing (national standard GB/T228.1-2021 was used), and the test results are shown in table 2.
As can be seen from Table 2, the magnesium alloy of the present invention has good strength, elongation and flame retardant properties; the rare earth element is not contained, and the cost is low; no combustion occurs at 900 c and a higher ignition point is achieved. Therefore, the high-strength high-toughness deformation flame-retardant magnesium alloy can be used for the vehicle body structural material for track traffic.
TABLE 2
| Examples | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Ignition condition |
| Example 1 | 319 | 266 | 11 | Unburned at 900 DEG C |
| Example 2 | 292 | 190 | 11.5 | Unburned at 900 DEG C |
| Example 3 | 300 | 238 | 12 | Unburned at 900 DEG C |
| Example 4 | 304 | 236 | 9 | Unburned at 900 DEG C |
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (10)
1. A high-strength high-toughness deformation flame-retardant magnesium alloy, characterized in that the magnesium alloy comprises, based on the total weight of the magnesium alloy: 5.0 to 7.0 weight percent of Al, 2.0 to 4.0 weight percent of Ca, 0 to 3.0 weight percent of Zn, 0 to 3.0 weight percent of Sn, 0.4 to 0.7 weight percent of Mn, less than 0.01 weight percent of impurity elements and the balance of Mg.
2. The high strength, high toughness, wrought flame retardant magnesium alloy of claim 1, wherein the magnesium alloy comprises, based on the total weight of the magnesium alloy: 5.0 to 7.0 weight percent of Al, 2.0 to 4.0 weight percent of Ca, 1.0 to 3.0 weight percent of Zn, 1.0 to 3.0 weight percent of Sn, 0.4 to 0.7 weight percent of Mn, less than 0.01 weight percent of impurity elements and the balance of Mg.
3. The high-strength high-toughness deformed flame-retardant magnesium alloy according to claim 1 or 2, wherein the high-strength high-toughness deformed flame-retardant magnesium alloy has a tensile strength of 292MPa or more, a yield strength of 190MPa or more, an elongation of 9% or more, and a fire point of 900 ℃ or more.
4. A method for preparing the high-strength high-toughness deformed flame-retardant magnesium alloy according to any one of claims 1 to 3, wherein the preparation method comprises the following steps:
s1: polishing and first preheating treatment are carried out on pure Mg, pure Al, mg-25wt% Ca master alloy, mg-10wt% Mn master alloy, optional pure Zn and optional pure Sn;
s2: the pure Mg, pure Al, mg-25wt% Ca master alloy, mg-10wt% Mn master alloy, optional pure Zn and optional pure Sn treated in step S1 are mixed in CO 2 And SF (sulfur hexafluoride) 6 Carrying out mixed smelting under the protection of mixed gas, and sequentially carrying out stirring, scum removal and heat preservation treatment to obtain alloy melt;
s3: cooling the alloy melt to obtain an ingot and removing the surface layer of the ingot;
s4: sequentially carrying out first solid solution treatment, second solid solution treatment, quenching treatment and second preheating treatment on the surface-removed cast ingot obtained in the step S3 to obtain a preheated cast ingot;
s5: and carrying out hot extrusion treatment on the preheated cast ingot to obtain the bar of the high-strength high-toughness deformation flame-retardant magnesium alloy.
5. The method for producing a high-strength and high-toughness wrought magnesium alloy according to claim 4, wherein in step S1, the content of Mg in the pure Mg is not less than 99.98wt%, the content of Al in the pure Al is not less than 99.98wt%, the content of Zn in the pure Zn is not less than 99.97wt%, and the content of Sn in the pure Sn is not less than 99.98wt%.
6. The method for producing a high-strength and high-toughness wrought magnesium alloy according to claim 4, wherein, in step S2:
the CO 2 And SF (sulfur hexafluoride) 6 CO in a mixed gas of (a) 2 And SF (sulfur hexafluoride) 6 The volume ratio of (99.4-99.6): (0.4-0.6);
the temperature of the mixed smelting is 700-800 ℃ and the time is 15-25min;
the stirring treatment time is 1-3min;
the heat preservation treatment time is 15-25min.
7. The method for producing a high-strength high-toughness wrought flame-retardant magnesium alloy according to claim 4, wherein in step S3, the alloy melt is cooled to 20-30 ℃.
8. The method for producing a high-strength and high-toughness wrought magnesium alloy according to claim 4, wherein, in step S4:
the temperature of the first solid solution treatment is 350-450 ℃ and the time is 12-18h;
the temperature of the second solid solution treatment is 460-550 ℃ and the time is 36-60h;
the quenching treatment comprises the steps of putting the cast ingot subjected to the second solid solution treatment into water with the temperature of 40-60 ℃ and cooling to 20-30 ℃;
the temperature of the second preheating treatment is 300-400 ℃ and the time is 0.5-1.5h.
9. The method for preparing a high-strength high-toughness wrought flame-retardant magnesium alloy according to claim 4, wherein in step S5, the extrusion temperature of the hot extrusion treatment is 300-400 ℃, the extrusion speed is 0.1-0.15mm/S, and the extrusion ratio is (10-14): 1;
the diameter of the bar is 8-12mm.
10. Use of the high-strength high-toughness deformed flame-retardant magnesium alloy according to any one of claims 1-3 as a structural section of a rail transit vehicle body.
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| CN1614063A (en) * | 2004-09-29 | 2005-05-11 | 上海交通大学 | Preparation of high-strength creep resistant deforming magnesium alloy |
| CN104480361A (en) * | 2014-11-26 | 2015-04-01 | 沈阳工业大学 | High-strength/toughness heat-resistant die casting magnesium alloy and preparation method thereof |
| CN105779834A (en) * | 2014-12-17 | 2016-07-20 | 宝山钢铁股份有限公司 | Low-cost high-strength anti-fatigue nonflammable wrought magnesium alloy and preparation method thereof |
| CN109536798A (en) * | 2017-09-22 | 2019-03-29 | 比亚迪股份有限公司 | A kind of antiflaming magnesium alloy and its preparation method and application |
| CN108118221A (en) * | 2017-11-30 | 2018-06-05 | 北京航空航天大学 | A kind of high tough wrought magnesium alloy and preparation method thereof |
| CN108330365A (en) * | 2018-02-06 | 2018-07-27 | 山西银光华盛镁业股份有限公司 | A kind of high fire-retardance wrought magnesium alloy and preparation method thereof |
| CN109182809A (en) * | 2018-11-19 | 2019-01-11 | 河北工业大学 | A kind of tough wrought magnesium alloy of high strength and low cost and preparation method thereof |
| CN110004341A (en) * | 2019-04-30 | 2019-07-12 | 上海大学 | The high-intensitive magnesium alloy and preparation method thereof containing rare earth |
| CN114438387A (en) * | 2022-02-10 | 2022-05-06 | 重庆大学 | Low-cost high-strength flame-retardant magnesium alloy and preparation method thereof |
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