CN115572926A - Heat treatment method of magnesium-lithium alloy - Google Patents
Heat treatment method of magnesium-lithium alloy Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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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
- 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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Abstract
The invention provides a heat treatment method of a magnesium-lithium alloy, which comprises the steps of preserving heat of the deformed magnesium-lithium alloy for 0.5 to 4 hours at 260 to 330 ℃ to obtain the preserved magnesium-lithium alloy; cooling the magnesium-lithium alloy after heat preservation to room temperature to obtain a heat-treated magnesium-lithium alloy; the magnesium-lithium alloy comprises the following components in percentage by weight: li:9.5-11.5%, al:2.0-4.0%, zn:0.2-1.0%, RE:0.05 to 4.0 percent of magnesium, other inevitable impurity elements and the balance of magnesium; and RE is a rare earth element. Through rare earth alloying and alloy element proportion regulation and control, and simultaneously combining the phase change and precipitation rules of a new alloy system, a heat treatment process matched with the new alloy system is developed, and the magnesium-lithium alloy material with low density and excellent room-temperature and high-temperature mechanical properties can be obtained through a simple heat treatment step. The magnesium-lithium alloy material obtained by heat treatment has good plastic deformation capability and high yield, and is suitable for batch production.
Description
Technical Field
The invention relates to the technical field of magnesium-lithium alloy, in particular to a heat treatment method of ultralight heat-resistant magnesium-lithium alloy.
Background
Weight reduction is an important development direction in the fields of materials, machinery and the like, and extremely high requirements are made on weight reduction in the fields of aerospace and the like. The density of the magnesium-lithium alloy is lower than that of the common magnesium-aluminum and magnesium-zinc system, and the magnesium-lithium alloy has great potential in the field of light weight.
Researches show that the single addition of Gd element or the mixed addition of Gd element and other RE elements is beneficial to improving the mechanical property and high-temperature property of the magnesium-lithium alloy, and trace Gd element can be dissolved in an alpha-Mg matrix to realize solid solution strengthening and enhance the creep resistance of the alloy; proper increase of Gd content can form high melting point Mg in the alloy 3 AlGd 2 And the performance of the alloy is enhanced through the coordination of fine grain strengthening and second phase strengthening. In the existing patent, the chinese patent with application number CN101429611 discloses a Gd-doped magnesium-lithium alloy, and doping of Gd promotes the alloy to maintain excellent room-temperature comprehensive mechanical properties under high Li content, but fails to further improve the high-temperature properties of the alloy by microalloying.
The micro-alloying can effectively improve the microstructure and the mechanical property of the magnesium-lithium alloy with high Li content (more than 9.5 wt.%), and realize the balance between low density and high strength. However, in the prior art, the types and the added contents of elements are more, so that the cost is increased, the alloy density is difficult to further reduce due to the increase of the content of heavy elements, and the difficulty in subsequent heat treatment processing is increased due to the element segregation behavior which is difficult to regulate.
The heat treatment process in CN104131247A "a heat treatment process for inhibiting plastic instability of quasicrystal reinforced magnesium-lithium alloy" is a secondary heat treatment: solid solution is carried out at 330-470 ℃, the temperature is kept for 4-8 hours, water quenching is carried out to cool to the room temperature, aging is carried out for 12-24 hours at 100-200 ℃, and then water quenching is carried out to cool to the room temperature. The heat treatment process of CN108456813A 'an Mg-Li-Al-Zn-Y series cast magnesium-lithium alloy and a heat treatment method thereof' is three-stage heat treatment: firstly, solid dissolving the magnesium-lithium alloy ingot at 280-420 ℃ for 2-8 hours, then solid dissolving at 200-270 ℃ for 0-16 hours, and finally aging the magnesium-lithium alloy ingot at 50-150 ℃ for 0-40 hours. The heat treatment process is complex, long in time consumption and low in production efficiency.
Although magnesium is presentCompared with other magnesium alloys, the lithium alloy has lower density and more obvious advantage of light weight, but has relatively lower mechanical property. In general, the higher the Li content in the Mg-Li alloy, the lower the material density and the lower the tensile strength of the material, which is 1.50 to 1.6g/cm for the current density 3 For the deformed magnesium-lithium alloy, the tensile strength after heat treatment is generally between 190 and 220MPa, the mechanical property is lower, and the requirement of engineering application is difficult to meet.
The magnesium-lithium alloy has the remarkable advantage of light weight, so that the magnesium-lithium alloy has a very high application prospect in the fields of aerospace and national defense war industry, but many practical application scenes in the fields face the requirement of high-temperature performance, and the magnesium-lithium alloy has low high-temperature performance and poor high-temperature service stability, which becomes an important factor restricting the application of the magnesium-lithium alloy.
How to obtain the magnesium alloy material with low density, excellent room temperature and high temperature mechanical properties with low cost and simple process is a technical problem in the industry.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for preparing a magnesium-lithium alloy with excellent high-temperature mechanical property, low density and low cost by using a low-cost and simplified process flow.
The invention provides a heat treatment method of a magnesium-lithium alloy, which comprises the following steps:
preserving the heat of the deformed magnesium-lithium alloy at 260-330 ℃ for 0.5-4 hours to obtain the preserved magnesium-lithium alloy;
cooling the magnesium-lithium alloy after heat preservation to room temperature to obtain a heat-treated magnesium-lithium alloy;
the magnesium-lithium alloy comprises the following components in percentage by weight:
Li：9.5-11.5％、
Al：2.0-4.0％、
Zn：0.2-1.0％、
RE：0.05-4.0％；
other inevitable impurity elements, and the balance of magnesium;
and RE is a rare earth element.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the deformed magnesium-lithium alloy is subjected to heat preservation at 280-310 ℃ for 1-3 hours to obtain the heat preserved magnesium-lithium alloy.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the step of cooling the magnesium-lithium alloy after heat preservation to room temperature adopts a water cooling or air cooling mode.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, the method preferably further comprises a step of preparing a deformed magnesium-lithium alloy, and the step of preparing the deformed magnesium-lithium alloy comprises a step of preparing the deformed magnesium-lithium alloy by adopting a multidirectional forging mode.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the step of preparing the deformed magnesium-lithium alloy comprises the steps of preheating and insulating the cast rod before forging, wherein the preheating temperature is 200-350 ℃, and the insulating time is 6-10 hours.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the step of preparing the deformed magnesium-lithium alloy comprises the steps of preheating a forging chopping block to 230-290 ℃, carrying out multidirectional forging with a single-pass deformation amount of 10-30%, carrying out 20-30 passes on forging, and carrying out axial transformation on an ingot blank for 1-3 times.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the step of preparing the deformed magnesium-lithium alloy comprises air cooling the material after forging.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, the magnesium-lithium alloy preferably contains inevitable impurity elements such as Si, fe, cu and the like, wherein Si is less than or equal to 0.05%, fe is less than or equal to 0.005%, cu is less than or equal to 0.005%, and the total content of the rest other elements is less than or equal to 0.30%.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, the mass percentage of Li in the alloy component is preferably 9.8-11.0%.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, the mass percentage of Al in the alloy component is preferably 2.5-3.5%.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the mass percentage of the alloy component Zn is as follows: 0.4 to 0.8 percent.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the alloy component RE comprises Gd, Y or a mixed element of Gd and Y, and the mass percentage is 0.1-3.0%.
Advantageous effects
According to the invention, through rare earth alloying and alloy element proportion regulation and control, and simultaneously combining with the phase change and precipitation rules of a new alloy system, a heat treatment process matched with the new alloy system is developed, and the magnesium-lithium alloy material with low density and excellent room-temperature and high-temperature mechanical properties can be obtained through a simple heat treatment step.
Other technical features and advantages of the present invention may be seen in the detailed description.
Detailed Description
The following describes the embodiments of the present invention in detail. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For numerical ranges, each range between its endpoints and individual point values, and each individual point value can be combined with each other to give one or more new numerical ranges, and such numerical ranges should be construed as specifically disclosed herein.
Throughout the present invention, unless otherwise specified, the contents of the respective components are all weight percentages, and the ratios of the respective components are all weight percentages.
An embodiment of the present invention provides a heat treatment method of a magnesium-lithium alloy, including:
preserving the heat of the deformed magnesium-lithium alloy at 260-330 ℃ for 0.5-4 hours to obtain the magnesium-lithium alloy after heat preservation;
cooling the heat-preserved magnesium-lithium alloy to room temperature to obtain a heat-treated magnesium-lithium alloy;
the magnesium-lithium alloy comprises the following components in percentage by weight:
Li：9.5-11.5％、
Al：2.0-4.0％、
Zn：0.2-1.0％、
RE：0.05-4.0％；
other inevitable impurity elements and the balance of magnesium;
and RE is a rare earth element.
The heat treatment scheme of the invention is simple, short in time consumption and easy to operate, and can greatly simplify the production flow, improve the production efficiency and accelerate the production period.
In general, the higher the Li content in the Mg-Li alloy, the lower the density of the material, and the lower the tensile strength of the material, which is 1.50-1.6g/cm for the existing density 3 For the deformed magnesium-lithium alloy, the tensile strength after heat treatment is generally between 190 and 220MPa, the mechanical property is lower, and the requirement of engineering application is difficult to meet. The heat treatment method in the scheme of the invention can obviously improve the tensile mechanical property of the deformed magnesium-lithium alloy, greatly improve the tensile mechanical property of the magnesium-lithium alloy at room temperature and expand the application range of the magnesium-lithium alloy. Meanwhile, the high-temperature stability of the magnesium-lithium alloy can be effectively improved, the high-temperature mechanical property of the magnesium-lithium alloy is improved, and the use requirements of the magnesium-lithium alloy under various working conditions are met.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the deformed magnesium-lithium alloy is subjected to heat preservation at 280-310 ℃ for 1-3 hours to obtain the heat preserved magnesium-lithium alloy.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the step of cooling the heat-preserved magnesium-lithium alloy to room temperature adopts a water cooling or air cooling mode.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, the method preferably further comprises a step of preparing the deformed magnesium-lithium alloy, and the step of preparing the deformed magnesium-lithium alloy comprises a step of preparing the deformed magnesium-lithium alloy by adopting a multidirectional forging mode.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the step of preparing the deformed magnesium-lithium alloy comprises the steps of preheating and insulating a cast rod before forging, wherein the preheating temperature in the preheating and insulating step is 200-350 ℃, and the insulating time is 6-10 hours.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the preheating and heat preservation step is carried out in a resistance furnace.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the step of preparing the deformed magnesium-lithium alloy comprises the steps of preheating a forging cutting board to 230-290 ℃, carrying out multidirectional forging with the single-pass deformation of 10-30%, carrying out 20-30 forging passes, and carrying out axial transformation on an ingot blank for 1-3 times.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the step of preparing the deformed magnesium-lithium alloy comprises the step of air cooling the material after forging.
The Mg-Li-Al-Zn-RE series ultra-light heat-resistant magnesium-lithium alloy realizes the great reduction of the density by improving the mass fraction of Li element, forms a solid solution strengthening and strengthening phase by adding main strengthening elements of Al and Zn, and forms Mg by adding one RE element or a plurality of RE elements separately and mixing 3 AlRE 2 Heat-resistant strengthening phase, and improves the thermal stability of the magnesium-lithium alloy. On the premise of keeping high Li content, the structure and performance of the as-cast alloy are optimized, and the formability of the plastic processing of the alloy is improved.
Researches find that the performance of the magnesium-lithium alloy in the heat treatment process is completely different from that of the magnesium alloy with the conventional HCP structure, the magnesium-lithium alloy has natural aging and quenching effects, and the dominant strengthening mechanism is changed into solid solution strengthening. Metastable MgLi in magnesium-lithium alloy 2 Based on the fact that the phase change rule of the metastable phase in the heat treatment process is complex, the metastable phase can be redissolved and separated out along with the temperature change, and the influence on the mechanical property is great, when the heat treatment process is formulated, the concept of high temperature and rapid cooling is tried to be adopted to improve the solid solution strengthening and aging strengthening effects to the maximum extent, and the high comprehensive mechanical property is obtained.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, the magnesium-lithium alloy preferably contains inevitable impurity elements such as Si, fe, cu and the like, wherein Si is less than or equal to 0.05%, fe is less than or equal to 0.005%, cu is less than or equal to 0.005%, and the total content of the rest other elements is not more than 0.30%.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, the mass percentage of the alloy component Li is preferably 9.8-11.0%.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the mass percentage of Al in the alloy component is 2.5-3.5%.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the mass percentage of the alloy component Zn is as follows: 0.4 to 0.8 percent.
According to the heat treatment method of the magnesium-lithium alloy provided by the invention, preferably, the alloy component RE comprises Gd, Y or a mixed element of Gd and Y, and the mass percentage is 0.1-3.0%.
When Gd and Y are mixed as the alloy component RE, the mass ratio of Gd: Y = (0.01 to 100): 1 is further provided.
The total content of impurities in the alloy components is not more than 0.05%.
Compared with the existing two-stage or multi-stage heat treatment system, the heat treatment method has the advantages of reduced solution treatment temperature, shortened heat treatment time, easy operation, greatly simplified production flow, improved production efficiency and accelerated production period.
The magnesium-lithium alloy obtained after the treatment by the heat treatment method breaks through the mechanical property of the magnesium-lithium alloy with the conventional application structure, the room temperature strength is higher than 220MPa, the 100 ℃ strength is higher than 130MPa, and the good combination of low density, excellent room temperature mechanical property and excellent high temperature mechanical property of the magnesium-lithium alloy is realized.
The requirements of reducing the density, reducing the addition amount of rare earth elements and improving the room temperature and high temperature performance of the alloy are comprehensively considered, and because the types and the addition contents of the alloy elements in the magnesium alloy have great influence on the microstructure and the mechanical property after heat treatment, the design of the small differences of the types and the addition contents of the alloy elements can cause great differences after heat treatment. In order to meet the requirements of low density, rare earth addition reduction and high temperature performance improvement, the invention designs a magnesium-lithium alloy system in a targeted manner, develops a heat treatment process corresponding to the magnesium-lithium alloy system in a targeted manner, and achieves the effects of low density, low rare earth addition and excellent high temperature performance through a simple heat treatment process.
The present invention will be described in detail below by means of specific embodiments, the following are merely examples of some embodiments of the present invention, and the scope of the present invention is not limited to the following examples.
Example 1
The embodiment provides a heat treatment method of an ultralight heat-resistant magnesium-lithium alloy, which comprises the following components in percentage by mass: li:9.8%, al:2.8%, zn:0.5%, gd:2.1%, and the impurities comprise inevitable impurity elements such as Fe, si, cu and the like, wherein the ratio of Fe:0.0033%, si:0.024%, cu:0.0011%, the total impurity content is about 0.012%, and the balance is Mg.
The preparation method of the alloy comprises three process procedures of fusion casting, plastic deformation and heat treatment. Vacuum casting is selected as a casting method, and a casting rod with the diameter of 220mm and the length of 420mm is obtained after the oxide skin is processed by turning. Then the cast rod is subjected to plastic deformation processing to prepare a magnesium-lithium alloy deformation billet with the diameter of 240mm and the length of 345 mm. The plastic deformation processing of the cast rod adopts a multidirectional forging mode, the cast rod is placed into a resistance furnace for preheating and heat preservation before forging, the preheating temperature is set to be 250 ℃, the heat preservation time is 8 hours, a forging chopping board is preheated to be 260 ℃, the deformation of a multidirectional forging single pass is 10-30%, the forging pass is 26 passes, and the ingot blank is axially transformed for 1 time. The forging was then held at 280 ℃ for 2 hours and then air cooled to room temperature. The tensile strength, yield strength and elongation at room temperature and 100 ℃ after heat treatment of the magnesium-lithium alloy are shown in table 1.
Example 2
The embodiment provides a heat treatment method of an ultralight heat-resistant magnesium-lithium alloy, which comprises the following components in percentage by mass: li:10.2%, al:3.0%, zn:0.4%, Y:1.8%, and the impurities comprise inevitable impurity elements such as Fe, si, cu and the like, wherein the ratio of Fe:0.0018%, si:0.031%, cu:0.0007 percent, the total content of impurities is about 0.01 percent, the balance is Mg, the total content of impurities is about 0.012 percent, and the balance is Mg. The alloy is subjected to vacuum casting and turning processing to obtain a casting rod with the diameter of 220mm and the length of 420mm, and then the casting rod is subjected to plastic deformation processing to prepare a magnesium-lithium alloy deformation blank with the diameter of 240mm and the length of 345 mm. The plastic deformation processing of the cast rod adopts a multidirectional forging mode, the cast rod is placed into a resistance furnace for preheating and heat preservation before forging, the preheating temperature is set to be 250 ℃, the heat preservation time is 8 hours, a forging chopping board is preheated to be 260 ℃, the deformation of a multidirectional forging single pass is 10-30%, the forging pass is 26 passes, and the ingot blank is axially transformed for 1 time. The forging was then held at 310 ℃ for 3 hours and then air cooled to room temperature. The tensile strength, yield strength and elongation at room temperature and 100 ℃ after heat treatment of the magnesium-lithium alloy are shown in table 1.
Example 3
The embodiment provides a heat treatment method of an ultralight heat-resistant magnesium-lithium alloy, which comprises the following components in percentage by mass: li:9.8%, al:2.8%, zn:0.5%, gd:2.1%, and the impurities comprise inevitable impurity elements such as Fe, si, cu and the like, wherein the ratio of Fe:0.0033%, si:0.024%, cu:0.0011%, the total impurity content is about 0.012%, and the balance is Mg. The alloy is subjected to vacuum casting and turning processing to obtain a casting rod with the diameter of 220mm and the length of 420mm, and then the casting rod is subjected to plastic deformation processing to prepare a magnesium-lithium alloy deformation blank with the diameter of 240mm and the length of 345 mm. The plastic deformation processing of the cast rod adopts a multidirectional forging mode, the cast rod is placed into a resistance furnace for preheating and heat preservation before forging, the preheating temperature is set to be 250 ℃, the heat preservation time is 8 hours, a forging chopping board is preheated to be 260 ℃, the deformation of a multidirectional forging single pass is 10-30%, the forging pass is 26 passes, and the ingot blank is axially transformed for 1 time. The forging was then held at 310 ℃ for 3 hours and then water cooled to room temperature. The tensile strength, yield strength and elongation at room temperature and 100 ℃ after heat treatment of the magnesium-lithium alloy are shown in table 1.
Comparative example 1
The comparative example provides a heat treatment method of a magnesium-lithium alloy, and the magnesium-lithium alloy comprises the following components in percentage by mass: li:9.8%, al:2.8%, zn:0.5%, gd:2.1%, and the impurities comprise inevitable impurity elements such as Fe, si, cu and the like, wherein the ratio of Fe:0.0033%, si:0.024%, cu:0.0011%, total impurity content of about 0.012%, and the balance of Mg. The alloy is subjected to vacuum casting and turning processing to obtain a casting rod with the diameter of 220mm and the length of 420mm, and then the casting rod is subjected to plastic deformation processing to prepare a magnesium-lithium alloy deformation blank with the diameter of 240mm and the length of 345 mm. The plastic deformation processing of the cast rod adopts a multidirectional forging mode, the cast rod is placed into a resistance furnace for preheating and heat preservation before forging, the preheating temperature is set to be 250 ℃, the heat preservation time is 8 hours, a forging chopping board is preheated to be 260 ℃, the deformation of a multidirectional forging single pass is 10-30%, the forging pass is 26 passes, and the ingot blank is axially transformed for 1 time. The forging was then held at 250 ℃ for 3 hours and then water cooled to room temperature. The tensile strength, yield strength and elongation at room temperature and 100 ℃ after heat treatment of the magnesium-lithium alloy are shown in table 1.
Comparative example 2
The comparative example provides a heat treatment method of a magnesium-lithium alloy, and the magnesium-lithium alloy comprises the following components in percentage by mass: li:9.8%, al:2.8%, zn:0.5%, gd:2.1%, and the impurities comprise inevitable impurity elements such as Fe, si, cu and the like, wherein the ratio of Fe:0.0033%, si:0.024%, cu:0.0011%, the total impurity content is about 0.012%, and the balance is Mg. The alloy is subjected to vacuum casting and turning processing to obtain a casting rod with the diameter of 220mm and the length of 420mm, and then the casting rod is subjected to plastic deformation processing to prepare a magnesium-lithium alloy deformation blank with the diameter of 240mm and the length of 345 mm. The plastic deformation processing of the cast rod adopts a multidirectional forging mode, the cast rod is placed into a resistance furnace for preheating and heat preservation before forging, the preheating temperature is set to be 250 ℃, the heat preservation time is 8 hours, a forging chopping board is preheated to be 260 ℃, the deformation of a multidirectional forging single pass is 10-30%, the forging pass is 26 passes, and the ingot blank is axially transformed for 1 time. The forging was then held at 260 ℃ for 6 hours and then air cooled to room temperature. The tensile strength, yield strength and elongation at room temperature and 100 ℃ after heat treatment of the magnesium-lithium alloy are shown in table 1.
TABLE 1 mechanical Properties of magnesium-lithium alloys after heat treatment in examples 1-3 and comparative examples 1-2
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without contradiction. The invention is not described in detail in order to avoid unnecessary repetition. In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. A heat treatment method of a magnesium-lithium alloy is characterized by comprising the following steps:
preserving the heat of the deformed magnesium-lithium alloy at 260-330 ℃ for 0.5-4 hours to obtain the preserved magnesium-lithium alloy;
cooling the heat-preserved magnesium-lithium alloy to room temperature to obtain a heat-treated magnesium-lithium alloy;
the magnesium-lithium alloy comprises the following components in percentage by weight:
Li：9.5-11.5％、
Al：2.0-4.0％、
Zn：0.2-1.0％、
RE：0.05-4.0％；
other inevitable impurity elements, and the balance of magnesium;
and RE is a rare earth element.
2. The method for heat treatment of magnesium-lithium alloy according to claim 1, wherein the deformed magnesium-lithium alloy is heat-preserved at 280-310 ℃ for 1-3 hours to obtain the heat-preserved magnesium-lithium alloy.
3. The method for heat treatment of magnesium-lithium alloy according to claim 1, wherein the step of cooling the magnesium-lithium alloy after heat preservation to room temperature is a water cooling or air cooling method.
4. The method for heat treating magnesium-lithium alloy according to claim 1, further comprising the step of preparing a deformed magnesium-lithium alloy, wherein the step of preparing a deformed magnesium-lithium alloy comprises preparing the deformed magnesium-lithium alloy by multi-directional forging.
5. The method for heat-treating a magnesium-lithium alloy according to claim 4, wherein the step of preparing the deformed magnesium-lithium alloy comprises the steps of preheating and holding the cast bar at 200-350 ℃ for 6-10 hours before forging.
6. The method for heat treatment of magnesium-lithium alloy according to claim 5, wherein the step of preparing the deformed magnesium-lithium alloy comprises preheating a forging anvil to 230-290 ℃, wherein the multi-directional forging single-pass deformation is 10-30%, the forging pass is 20-30, and the ingot blank is axially transformed 1-3 times.
7. The method for heat-treating a magnesium-lithium alloy according to claim 6, wherein the step of preparing a deformed magnesium-lithium alloy comprises air-cooling the material after forging.
8. The method for heat-treating a magnesium-lithium alloy according to claim 1, wherein the magnesium-lithium alloy contains inevitable impurity elements such as Si, fe, cu and the like, wherein Si is 0.05% or less, fe is 0.005% or less, cu is 0.005% or less, and the total content of the remaining other elements is not more than 0.30%.
9. The method for heat treatment of a magnesium-lithium alloy according to claim 1, wherein the mass percent of the alloy component Li is 9.8-11.0%, the mass percent of the alloy component Al is 2.5-3.5%, and the mass percent of the alloy component Zn is: 0.4 to 0.8 percent.
10. The method for heat-treating a magnesium-lithium alloy according to claim 1, wherein said alloy component RE comprises Gd, Y or a mixture thereof in an amount of 0.1 to 3.0% by mass.
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