CN115584419B - Heat-resistant biphase magnesium-lithium alloy and preparation method thereof - Google Patents
Heat-resistant biphase magnesium-lithium alloy and preparation method thereof Download PDFInfo
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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Abstract
The invention belongs to the technical field of magnesium-lithium alloy preparation, and particularly relates to a heat-resistant biphase magnesium-lithium alloy and a preparation method thereof. The invention provides a heat-resistant double-phase magnesium-lithium alloy, which realizes the purposes of heat resistance and stabilization of the alloy by adjusting the contents of various trace elements such as Si, sn, RE, sr, cu and the like on the basis of the double-phase LA magnesium-lithium alloy. The heat-resistant biphase magnesium-lithium alloy consists of the following components in percentage by mass: 6 to 9.5 percent of Li, 3 to 7 percent of Al, 0.5 to 1.0 percent of Si, 0.2 to 0.5 percent of Sn, 0.5 to 1.0 percent of Sr, 0.1 to 0.8 percent of RE and 0.05 to 0.2 percent of Cu; wherein the sum of the mass fractions of Si, sn, sr, RE and Cu is not more than 2.8%, and the balance is Mg. The invention adopts the modes of vacuum casting, high-temperature heat treatment and extrusion die forging compounding, plays roles of strengthening and stabilizing fine crystals, work hardening and the like, realizes near net forming of structural parts, can obviously improve the metallurgical quality of alloy materials, effectively inhibits the overaging softening phenomenon of magnesium-lithium alloy, and further improves the toughness and heat resistance of the magnesium-lithium alloy.
Description
Technical Field
The invention belongs to the technical field of magnesium-lithium alloy preparation, and particularly relates to a heat-resistant biphase magnesium-lithium alloy and a preparation method thereof.
Background
Magnesium-lithium alloys are currently the lightest alloy systems,density as low as 1.3g/cm 3 Has high specific strength and specific rigidity and good low-temperature impact resistance. Moreover, the magnesium-lithium alloy is very different from other metal materials, and has excellent low-temperature mechanical properties. Compared with the typical LA141 magnesium lithium alloy, the tensile strength is 166MPa, the yield strength is 110MPa, the elongation is more than 20 percent at room temperature, when the temperature is reduced to minus 253 ℃, the tensile strength is 304MPa, the yield strength is 258MPa, the elongation is more than 11 percent, the strength is improved, meanwhile, the high-level plasticity is still maintained, namely, the comprehensive mechanical property is improved along with the reduction of the temperature, and the alloy has more remarkable application advantages in a low-temperature environment scene. However, magnesium-lithium alloys have low strength and very poor heat resistance, and are generally used as non-critical parts of secondary bearing members, and have very limited applications.
The alloy elements used in the developed heat-resistant magnesium alloy mainly include rare earth elements (RE) and silicon (Si), and have excellent alloy properties, and alloys such AS AS, WE and VW have been developed. These two elements are also mainly used in magnesium-lithium alloy to try to improve heat resistance, and Mg-14Li-3Ag-5Zn-2Si heat-resistant alloy is developed in 1960s in the United states, and sigma of the alloy b 131-138 MPa, sigma s 104MPa, delta 10%, sigma at 100 DEG C b About 100MPa, and the alloy is applied to spacecraft castings, however, the alloy has limited improvement of heat-resistant effect and lower room temperature strength. The research emphasis of each country is turned to strength improvement, and research progress in heat resistance is slow.
In recent decades, with the progress of research and production of domestic magnesium-lithium alloy, the research of high strength, corrosion resistance and high plasticity is fully developed, and the heat resistance of the alloy is also seen by researchers again. The Chinese patent with publication number of CN104046869A discloses a magnesium-lithium-silicon alloy and a preparation method thereof, wherein the mass percentages of each component of the alloy are as follows: 7-9%, si: 1-3%, RE: 1-5%, sr: 0.5-2% of Mg and the balance of Mg, wherein the alloy has tensile strength of 118-150 MPa, yield strength of 83-103 MPa and elongation of 20-40% and is a medium-strength heat-resistant double-phase magnesium-lithium alloy, the heat resistance of the alloy is improved mainly by the composite addition of three elements of Si, RE and Sr, however, excessive addition of Si, RE and Sr has great influence on the consistency of a structure. Because the solid solubility of Si in the magnesium alloy is extremely small, the Si generates a Mg2Si phase, and when the content is more than 1%, redundant Si exists as massive simple substance particles, so that the integrity of a fracture structure is improved; RE can refine Mg2Si phase and generate REAlSi phase, but the content is too much, so that the heat resistance is improved only limited, and the density is increased and the elongation is reduced; however, excessive Sr content also causes a decrease in plasticity.
With the development of the times, the light weight is a future development trend of industries such as aerospace, automobiles, 3C and the like. The light weight of short range hypersonic missiles with certain requirements on heat resistance is also proposed, and the requirements on the heat resistance temperature are only 100-150 ℃. As the lightest metal structural material, the weight reduction effect of the magnesium-lithium alloy is particularly remarkable. Therefore, the development of the medium-strength heat-resistant ultra-light magnesium lithium alloy with certain heat stability has important significance in providing raw material selection for aerospace parts.
Disclosure of Invention
Aiming at the problems of low absolute strength, poor heat resistance and low heat stability of the magnesium-lithium alloy, the invention provides a heat-resistant double-phase magnesium-lithium alloy, and the purposes of heat resistance and stabilization of the alloy are realized by adjusting the contents of various trace elements such as Si, sn, RE, sr, cu on the basis of the double-phase LA magnesium-lithium alloy.
The invention also provides a preparation method of the heat-resistant biphase magnesium-lithium alloy.
The invention further provides application of the heat-resistant biphase magnesium-lithium alloy.
Based on the above purpose, the invention adopts the following technical scheme:
the heat-resistant biphase magnesium-lithium alloy consists of the following components in percentage by mass: 6 to 9.5 percent of Li, 3 to 7 percent of Al, 0.5 to 1.0 percent of Si, 0.2 to 0.5 percent of Sn, 0.5 to 1.0 percent of Sr, 0.1 to 0.8 percent of RE and 0.05 to 0.2 percent of Cu; wherein the sum of the mass fractions of Si, sn, sr, RE and Cu is not more than 2.8%, the total amount of impurity elements such as Fe, ni and the like is less than 0.05%, and the balance is Mg.
Specifically, RE is one or two of rare earth elements Y and Gd.
Further, the heat-resistant biphase magnesium-lithium alloy comprises the following components in percentage by mass: 6-9.5% of Li, 3-7% of Al, 0.5-1.0% of Si, 0.2-0.5% of Sn, 0.5-1.0% of Sr, 0.3-0.8% of Y+Gd and 0.05-0.2% of Cu; wherein the sum of the mass fractions of Si, sn, sr, RE and Cu is not more than 2.8%, si+Sn is not more than 1.3%, the total amount of impurity elements such as Fe, ni and the like is less than 0.05%, and the balance is Mg.
The preparation method of the heat-resistant biphase magnesium-lithium alloy comprises the following steps:
(1) Vacuum casting: proportioning the raw materials of each component of the magnesium-lithium alloy according to the mass percentage, placing the mixture in a vacuum induction furnace, vacuumizing to below 10Pa for smelting, and then casting to obtain an ingot;
(2) Extruding the preform at a medium and high temperature: placing the magnesium-lithium alloy cast ingot obtained in the step (1) into a table furnace for solution treatment at 350-400 ℃, and then cooling to 280-350 ℃ by air cooling or water cooling for bar extrusion to prepare a preform;
(3) And (3) low-temperature die forging integrated forming: cutting the preform obtained in the step (2) into required lengths, then placing the lengths into a heat treatment furnace, heating the lengths to 150-230 ℃ for 2-3 h, performing die forging near net forming, and demolding to obtain the heat-resistant dual-phase magnesium-lithium alloy structural member.
Specifically, in the step (1), the vacuum casting process is as follows: and (3) after the alloy raw materials are proportioned, placing the alloy raw materials in a vacuum induction furnace, vacuumizing to below 10Pa, heating and melting, mechanically stirring for 2-3 times after melting, standing and preserving heat for 10-30 min at the temperature of 700-730 ℃ for smelting, and then casting.
Specifically, the ingot obtained in the step (1) is a cylindrical ingot with the diameter phi of 500-700 mm.
Specifically, the solution treatment time in the step (2) is 4-15 hours; when in extrusion, the extrusion ratio is 3.5-15, and the diameter of the obtained preform is 150-250 mm.
Specifically, before the die forging near-net forming in the step (3), the low-temperature die forging die is subjected to online isothermal heating at the preheating temperature of 150-230 ℃, and then the bar blank subjected to heat treatment is placed in the die forging die for die forging near-net forming, wherein the demoulding temperature after the die forging near-net forming is less than or equal to 100 ℃.
Specifically, the structural member finally obtained in the step (3) is a thin-wall member, a cylindrical member, a U-shaped member or a frame member.
The method prepares the medium-strength heat-resistant biphase magnesium-lithium alloy structural member by casting, extruding, die forging and large-size large plastic deformation compounding the magnesium-lithium alloy cast ingot with specific components.
The invention also provides application of the heat-resistant biphase magnesium-lithium alloy in preparing parts of an aerospace detector or a short-range high-overspeed aerospace vehicle.
Specifically, the parts are thin-wall structural parts.
According to the invention, through researching alloying elements in the magnesium-lithium alloy, the mechanical properties of the alloy can be improved by adding Al, zn and RE elements, and the primary Al generated after the composite addition 2 RE、Mg 2 Zn 3 RE 2 The isothermal stable phase is beneficial to the improvement of heat resistance, but has higher density, is easy to precipitate in magnesium-lithium alloy melt with lower density, and is extremely low in actual yield and difficult to prepare stably, so that the Al is taken as one of main elements, trace RE is added, so that a small amount of AlRE phase is generated, and the rest of the Al is mainly dissolved in a magnesium-lithium alloy structure, thereby playing roles of improving the atom mismatch degree and enhancing the atom diffusion barrier; si and Sn elements are added, so that the mechanical property is properly improved, and simultaneously, mg can be generated 2 Si、Mg 2 The Sn heat-resistant primary phase has low density, close to a matrix and high actual yield, however, the solid solubility of Si in the magnesium-lithium alloy is very small and mainly exists in the form of a compound and Si-rich particles, and particularly, the inventor researches find that when the Si content is more than 1 weight percent, the Si-rich bulk structure is rapidly increased and has bad influence on the strong plasticity, so that the trace addition range of Si and Sn is optimized; cu has small solid solubility in magnesium-lithium alloy, can generate good solid solution strengthening effect with lower addition, has small influence on plasticity, has the effects of improving structure, improving performance stability and inhibiting overaging, and provides composite addition of Sr, cu and RE according to synergistic strengthening effect, thereby refining Mg 2 Si、Mg 2 Sn is enriched in the grain boundary to prevent the diffusion of atoms, so that the thermal stability is improved. The invention is realized by the following steps ofThe reasonable collocation of each element in the alloy integrates the advantages of each element, and the improvement of the heat resistance and the stability of the prepared magnesium-lithium alloy is realized.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the heat-resistant magnesium-lithium alloy, on the basis of the biphase LA magnesium-lithium alloy, the heat resistance and stabilization effects are achieved through Si, sn, RE, sr, cu multi-element trace compound addition with the total mass fraction not exceeding 2.8%, namely through the synergistic enhancement of multiple components, and the low density characteristic is ensured.
2. The invention adopts the modes of vacuum casting, high-temperature heat treatment and extrusion die forging compounding, plays roles of strengthening and toughening, work hardening, structural tissue performance integration and the like, can obviously improve the metallurgical quality of alloy materials, effectively inhibit the overaging softening phenomenon of magnesium-lithium alloy, further improve the toughness and heat resistance of the magnesium-lithium alloy, realize the preparation of high-purity magnesium-lithium alloy materials with medium strength, excellent heat resistance, good heat stability and stable quality, and has remarkable industrial application prospect.
3. According to the invention, the LA magnesium-lithium alloy is subjected to microalloying and a short-flow preparation process to be compounded, so that the low-density characteristic of the magnesium-lithium alloy is maintained, the natural aging softening of the magnesium-lithium alloy is restrained, the heat resistance and the heat stability are improved, the service life cycle of a material member is prolonged, and the application field of the magnesium-lithium alloy is enlarged. The preparation method of the heat-resistant biphase magnesium-lithium alloy can prepare the ultra-light heat-resistant biphase magnesium-lithium alloy with the tensile strength of 148MPa at the temperature of 150 ℃.
4. The heat-resistant magnesium-lithium alloy has the room-temperature tensile strength of 220MPa-270MPa and the 150 ℃ tensile strength of 120-150 MPa, can be compared with the common heat-resistant magnesium alloy, and has good application prospect.
The technology fully combines the easy deformation characteristic of the magnesium-lithium alloy, and the developed low-temperature die forging integrated forming technology not only reduces the growth tendency of recrystallized grains, but also has high material utilization rate and controllable production cost, and has good practical application prospect in the field of new aerospace materials.
Drawings
FIG. 1 is a photograph showing a metallographic structure of an extruded dual-phase magnesium-lithium alloy in example 1, wherein the mass fraction of Si is 0.9%;
FIG. 2 is a photograph showing metallographic structure of the magnesium-lithium alloy of comparative example 1 (wherein Si mass fraction is more than 1% (specifically 2%).
Detailed Description
The present invention will be described in further detail below in order to make the objects, technical solutions and effects of the present invention more clear and distinct. 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 raw materials used in the following examples are all common commercial products.
Example 1
The heat-resistant biphase magnesium-lithium alloy consists of the following components in percentage by mass: 8.8% Li, 3.6% Al, 0.9% Si, 0.3% Sn, 0.5% Y, 0.2% Gd, 0.5% Sr, 0.1% Cu, the total amount of impurity elements Fe, ni, etc. is less than 0.05%, and the balance is Mg.
The preparation method of the heat-resistant biphase magnesium-lithium alloy comprises the steps of vacuum casting, forging, extrusion and other thermomechanical treatment, and specifically comprises the following steps:
(1) Vacuum casting: proportioning the magnesium-lithium alloy elements according to the proportion, placing the mixture in a vacuum induction furnace, vacuumizing to 10Pa, heating for melting, mechanically stirring for 2 times after melting, standing at 710 ℃ for 25min for melting, and casting to obtain a cylindrical ingot with the diameter of 700 mm;
(2) Extruding the preform at a medium and high temperature: placing the magnesium-lithium alloy cast ingot obtained in the step (1) into a table furnace, carrying out solution treatment for 8 hours at the temperature of 380 ℃, then cooling to 300 ℃, extruding on a 7000t extruder, preparing a rod blank with the diameter of 250mm in a back extrusion mode, wherein the extrusion ratio is 7.8, and then cooling to room temperature;
(3) And (3) low-temperature die forging integrated forming: cutting the prefabricated extruded rod blank obtained in the step (2) into required lengths, then placing the prefabricated extruded rod blank into a heat treatment furnace, heating to 180 ℃ for heat preservation for 2 hours, simultaneously heating a low-temperature die forging die to 180 ℃ on line, placing the heat-treated rod blank into the die forging die for die forging near net forming, finally cooling to 100 ℃ and demoulding to obtain the heat-resistant biphase magnesium-lithium alloy cylindrical part.
Example 2
The heat-resistant biphase magnesium-lithium alloy consists of the following components in percentage by mass: 6% Li, 5.1% Al, 0.8% Si, 0.5% Sn, 0.6% Y, 0.1% Gd, 0.6% Sr, 0.2% Cu, the total amount of impurity elements Fe, ni, etc. is less than 0.05%, and the balance is Mg.
The preparation method of the heat-resistant biphase magnesium-lithium alloy comprises the steps of vacuum casting, forging, extrusion and other thermomechanical treatment, and specifically comprises the following steps:
(1) Vacuum casting: proportioning the magnesium-lithium alloy elements according to the proportion, placing the mixture in a vacuum induction furnace, vacuumizing to 10Pa, heating for melting, mechanically stirring for 2 times after melting, standing at 720 ℃ for 20min for melting, and casting to obtain a cylindrical ingot with the diameter of 550 mm;
(2) Extruding the preform at a medium and high temperature: placing the magnesium-lithium alloy cast ingot obtained in the step (1) into a table furnace, carrying out solution treatment for 4 hours at the temperature of 350 ℃, then cooling to 280 ℃, extruding on a 7000t extruder, preparing a rod blank with the diameter of 150mm in a back extrusion mode, wherein the extrusion ratio is 13.4, and then cooling to room temperature;
(3) And (3) low-temperature die forging integrated forming: cutting the prefabricated extruded rod blank obtained in the step (2) into required lengths, then placing the prefabricated extruded rod blank into a heat treatment furnace, heating to 230 ℃ for heat preservation for 3 hours, simultaneously heating a low-temperature die forging die to 230 ℃ on line, placing the heat-treated rod blank into the die forging die for die forging near net forming, finally cooling to 100 ℃ and demoulding to obtain the heat-resistant biphase magnesium-lithium alloy U-shaped piece.
Example 3
The heat-resistant biphase magnesium-lithium alloy consists of the following components in percentage by mass: 9.2% Li, 3.8% Al, 0.8% Si, 0.3% Sn, 0.3% Y, 0.1% Gd, 0.5% Sr, 0.07% Cu, less than 0.05% impurity elements Fe, ni, and the balance Mg.
The preparation method of the heat-resistant biphase magnesium-lithium alloy comprises the steps of vacuum casting, forging, extrusion and other thermomechanical treatment, and specifically comprises the following steps:
(1) Vacuum casting: proportioning the magnesium-lithium alloy elements according to the proportion, placing the mixture in a vacuum induction furnace, vacuumizing to 10Pa, heating for melting, mechanically stirring for 2 times after melting, standing at 700 ℃ for 30min for melting, and casting to obtain a cylindrical ingot with the diameter of 550 mm;
(2) Extruding the preform at a medium and high temperature: placing the magnesium-lithium alloy cast ingot obtained in the step (1) into a table furnace, carrying out solution treatment for 4 hours at the temperature of 360 ℃, then cooling to 280 ℃, extruding on a 7000t extruder, preparing a rod blank with the diameter of 180mm in a back extrusion mode, wherein the extrusion ratio is 9.3, and then cooling to room temperature;
(3) And (3) low-temperature die forging integrated forming: cutting the prefabricated extruded rod blank obtained in the step (2) into required lengths, then placing the prefabricated extruded rod blank into a heat treatment furnace, heating to 150 ℃ for 3 hours, simultaneously heating a low-temperature die forging die to 150 ℃ on line, placing the heat-treated rod blank into the die forging die for die forging near net forming, finally cooling to 100 ℃ and demoulding to obtain the heat-resistant biphase magnesium-lithium alloy frame body part.
Comparative example 1
Comparative example 1 differs from example 1 in that the alloy composition is different, the alloy of comparative example 1 consisting of the following components in mass percent: 9.2% Li, 3.8% Al, 2% Si, 0.3% Y, 0.1% Gd, 0.5% Sr, 0.07% Cu, less than 0.05% of impurity elements Fe, ni and the like, and the balance of Mg. The alloy of comparative example 1 was prepared in the same manner as in example 1, except that the Si element content exceeded the range claimed by the present invention, reaching 2%. As a result of the room temperature mechanical property test of the magnesium-lithium alloy obtained in comparative example 1, the tensile strength of 278MPa, the yield strength of 251MPa and the elongation of 5.2% were poor, and the alloy in comparative example 1 was poor in plasticity.
FIG. 1 is a photograph showing a metallographic structure of an extruded dual-phase magnesium-lithium alloy in example 1, wherein the mass fraction of Si is 0.9%; fig. 2 is a photograph of metallographic structure of the magnesium-lithium alloy in comparative example 1, in which the mass fraction of Si is more than 1% (specifically, 2%), and it can be seen from fig. 1 that Mg2Si phase is fine, plays a role in improving strength and heat resistance, and has little damage to plasticity.
As can be seen from FIG. 2, the Si-rich bulk structure is drastically increased to 20 μm due to the increase of Si content, and the multi-enrichment can effectively improve strength and heat resistance, but has bad influence on strong plasticity, and has a high melting point, so that it is difficult to eliminate solid solution.
The density, room temperature mechanical properties and high temperature mechanical properties of the magnesium-lithium alloy prepared in examples 1, 2 and 3 are shown in table 1, and the test results of examples 1, 2 and 3 and comparative example 1 are obtained by referring to the method in national standard GB/T16865 samples and methods for tensile test of deformed aluminum, magnesium and alloy processed products thereof.
TABLE 1
As can be seen from Table 1, the heat-resistant magnesium-lithium alloy has the lowest tensile strength of more than 230MPa and the plasticity of more than 20% at room temperature, and has excellent room temperature mechanical properties; the tensile strength can still reach more than 120MPa at 150 ℃, and most magnesium-lithium alloys are generally below 100 MPa. Compared with comparative example 1, the alloys prepared in examples 1-3 of the present invention have good heat resistance and plasticity.
While specific embodiments of the invention have been described above, it should be understood that the invention is not limited to the particular embodiments described above. Various changes or modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention.
Claims (8)
1. The heat-resistant biphase magnesium-lithium alloy is characterized by comprising the following components in percentage by mass: 6 to 9.5 percent of Li, 3 to 7 percent of Al, 0.5 to 1.0 percent of Si, 0.2 to 0.5 percent of Sn, 0.5 to 1.0 percent of Sr, 0.1 to 0.8 percent of RE and 0.05 to 0.2 percent of Cu; wherein the sum of the mass fractions of Si, sn, sr, RE and Cu is not more than 2.8%, and the balance is Mg; RE is one or two of rare earth elements Y and Gd;
the heat-resistant biphase magnesium-lithium alloy is prepared by the following steps:
(1) Vacuum casting: proportioning the raw materials of each component of the magnesium-lithium alloy according to the mass percentage, placing the mixture in a vacuum induction furnace, vacuumizing to below 10Pa for smelting, and then casting to obtain an ingot;
(2) Extruding the preform at a medium and high temperature: performing solution treatment on the magnesium-lithium alloy cast ingot obtained in the step (1) at 350-400 ℃, and then performing air cooling or water cooling to 280-350 ℃ to perform bar extrusion to prepare a preform;
(3) And (3) low-temperature die forging integrated forming: cutting the preform obtained in the step (2), heating to 150-230 ℃ and preserving heat for 2-3 hours, performing die forging near net forming, and demolding to obtain the heat-resistant dual-phase magnesium-lithium alloy structural member.
2. The heat-resistant dual-phase magnesium-lithium alloy according to claim 1, which is characterized by comprising the following components in percentage by mass: 6-9.5% of Li, 3-7% of Al, 0.5-1.0% of Si, 0.2-0.5% of Sn, 0.5-1.0% of Sr, 0.3-0.8% of Y+Gd and 0.05-0.2% of Cu; wherein the sum of the mass fractions of Si, sn, sr, RE and Cu is not more than 2.8%, si+Sn is less than or equal to 1.3%, and the balance is Mg.
3. The method for preparing the heat-resistant dual-phase magnesium-lithium alloy according to claim 1 or 2, comprising the steps of:
(1) Vacuum casting: proportioning the raw materials of each component of the magnesium-lithium alloy according to the mass percentage, placing the mixture in a vacuum induction furnace, vacuumizing to below 10Pa for smelting, and then casting to obtain an ingot;
(2) Extruding the preform at a medium and high temperature: performing solution treatment on the magnesium-lithium alloy cast ingot obtained in the step (1) at 350-400 ℃, and then performing air cooling or water cooling to 280-350 ℃ to perform bar extrusion to prepare a preform;
(3) And (3) low-temperature die forging integrated forming: cutting the preform obtained in the step (2), heating to 150-230 ℃ and preserving heat for 2-3 hours, performing die forging near net forming, and demolding to obtain the heat-resistant dual-phase magnesium-lithium alloy structural member.
4. A method of manufacture according to claim 3, wherein the vacuum casting process is: and (3) after the alloy raw materials are proportioned, placing the alloy raw materials in a vacuum induction furnace, vacuumizing to below 10Pa, heating and melting, mechanically stirring for 2-3 times after melting, then preserving heat at 700-730 ℃ for 10-30 min for smelting, and then casting.
5. The method according to claim 3, wherein the ingot obtained in the step (1) is a cylindrical ingot having a diameter of 500-700 mm.
6. The method according to claim 3, wherein the solution treatment time in the step (2) is 4 to 15 hours; when in extrusion, the extrusion ratio is 3.5-15, and the diameter of the obtained preform is 150-250 mm.
7. The method according to claim 3, wherein in the step (3), the die-forging near-net-shape-forming post-mold-release temperature is 100 ℃ or lower.
8. Use of the heat resistant dual phase magnesium lithium alloy of claim 1 or 2 in the manufacture of a part for a space probe or short range high overspeed aircraft.
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| CN114346147A (en) * | 2021-12-23 | 2022-04-15 | 重庆大学 | Rotary swaging preparation method of light high-strength magnesium alloy |
| CN114535478A (en) * | 2022-02-25 | 2022-05-27 | 重庆大学 | Rotary die forging preparation method of ultralight high-strength magnesium-lithium alloy |
| CN115161527A (en) * | 2022-07-28 | 2022-10-11 | 郑州轻研合金科技有限公司 | High-strength weldable magnesium-lithium alloy and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104046869A (en) * | 2014-07-04 | 2014-09-17 | 重庆大学 | Mg-Li-Si alloy and preparation method thereof |
| CN107904463A (en) * | 2017-12-27 | 2018-04-13 | 广州宇智科技有限公司 | Possesses the two-phase alpha+beta magnesium lithium alloy of excellent casting character and heat transfer property |
| CN114346147A (en) * | 2021-12-23 | 2022-04-15 | 重庆大学 | Rotary swaging preparation method of light high-strength magnesium alloy |
| CN114535478A (en) * | 2022-02-25 | 2022-05-27 | 重庆大学 | Rotary die forging preparation method of ultralight high-strength magnesium-lithium alloy |
| CN115161527A (en) * | 2022-07-28 | 2022-10-11 | 郑州轻研合金科技有限公司 | High-strength weldable magnesium-lithium alloy and preparation method thereof |
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