CN112143951A - High-plasticity flame-retardant die-casting magnesium alloy and preparation method thereof - Google Patents
High-plasticity flame-retardant die-casting magnesium alloy and preparation method thereof Download PDFInfo
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- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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Abstract
The invention belongs to the field of metal materials, and particularly relates to a high-plasticity flame-retardant die-casting magnesium alloy and a preparation method thereof. The composite material comprises the following components in percentage by mass: 2-8 wt.% of Sm, 2-9 wt.% of Al, 0.3-1 wt.% of Zn, 0.5-2.5 wt.% of Ca, and the balance of Mg. In the components of the magnesium alloy, Ca element and rare earth element Sm are added to effectively improve the flame retardant property of the alloy under the combined action; in addition, rare earth element Sm and aluminum element are effectively utilized to generate Al2The Sm generates a thinning effect relative to the magnesium matrix to improve the cast elongation and avoid plasticity reduction caused by the addition of Ca element. But a trace amountZn element can coordinate basal plane slippage of magnesium, so that the plasticity is improved while the strength is ensured. Under the combined action of the alloy elements, the die-casting magnesium alloy is ensured to have moderate strength and high elongation, and can be applied to die-casting production of magnesium alloy with high requirement on elongation.
Description
Technical Field
The invention belongs to the field of metal materials, and particularly relates to a high-plasticity flame-retardant die-casting magnesium alloy and a preparation method thereof.
Background
Die casting is the most important forming process of magnesium alloy parts, and the die casting process of magnesium alloy often hinders the large-scale application of the process in industrial production due to the problems of easy oxidation and burning of the melt, especially in the application occasions requiring high elongation. The main reason is that magnesium alloy has active chemical properties and is easy to oxidize at high temperature, and oxidation combustion in the magnesium alloy smelting process caused by the oxidation combustion reduces the quality of magnesium alloy products, so that the problem of flame retardance of magnesium alloy is always an important problem for hindering the development of magnesium alloy. The development of die-casting magnesium alloy which is not easy to oxidize and burn is an effective solution, and the existing research and development of series flame-retardant magnesium alloy, such as the addition of Be element, Ca element, rare earth element and the like in the magnesium alloy. Although the addition of the elements can effectively improve the ignition point of the magnesium alloy melt, the Be element has stronger toxicity and can obviously coarsen the crystal grains of the magnesium alloy; while the Ca element is non-toxic, the Ca-rich compound distributed in the grain boundary formed by the addition of the Ca element can obviously deteriorate the plasticity of the magnesium alloy; the improvement effect of adding rare earth elements into magnesium alloy on flame retardance is far less than that of Be and Ca elements, and in order to realize flame retardance equal to 1% of Ca, the addition amount of the rare earth elements needs to exceed more than 15 wt%, so that the principle of economy is not met. Therefore, in order to meet the further development of the magnesium alloy in the die casting industry, the development of the low-rare earth and high-elongation flame-retardant magnesium alloy is urgently needed while ensuring sufficient strength, and the requirement of die casting production of the high-elongation flame-retardant magnesium alloy is met.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems that the conventional cast magnesium alloy is difficult to melt and process under atmospheric conditions due to severe oxidation and combustion characteristics and the magnesium alloy die casting has low plasticity and toughness, a high-plasticity flame-retardant die-casting magnesium alloy solution with excellent performance is provided. Based on the calculation of a crystallography 'edge-edge matching' model, the invention discovers Al generated in situ in the magnesium alloy2The intermetallic compounds such as Sm can effectively refine the crystal grains of the magnesium alloy, and the size of the crystal grains can be refined from millimeter level to about 40 micrometers. The magnesium alloy refined by the method has higher as-cast elongation, for example, the as-cast elongation of the Mg-4Sm-3Al alloy can reach more than 20 percent. In addition, based on the consensus that Ca element and rare earth element improve the flame retardant property of magnesium alloy; and trace amountThe principle that the addition of Ca element can consume the surplus Al element to form a strengthening phase Al2Ca and the like to further strengthen the magnesium alloy; provides a new idea for developing novel high-plasticity flame-retardant magnesium alloy.
The invention is realized by the following technical scheme:
the invention provides a high-plasticity flame-retardant die-casting magnesium alloy, which comprises the following alloy elements in percentage by mass:
Sm 2％～8％；
Al 2％～9％；
Zn 0.3％～1％；
Ca 0.5％～2.5％；
the total amount of impurity elements is less than or equal to 0.2 percent;
the balance being magnesium.
The working principle of the invention is as follows: the Al element is the most commonly used system of the magnesium alloy, and a certain amount of Al in the cast magnesium alloy can obviously improve the fluidity of molten metal during filling. Ca is a proper flame-retardant element in the magnesium alloy, and the mechanism is that the Ca is a surface active element in the magnesium alloy during high-temperature smelting, a large amount of Ca in a high-temperature liquid state is eccentrically gathered on the surface of the magnesium alloy, and the Ca is preferentially combined with oxygen to generate CaO compared with magnesium. When Al element is simultaneously present, MgO + CaO + Al can be generated2O3And (6) compounding a protective film. The composite oxide film is attached to the surface of liquid magnesium, can effectively inhibit further oxidation of magnesium melt, plays a role in flame retardance, and improves the ignition temperature. The flame retardant research on the Mg-Ca binary alloy shows that the ignition point of the magnesium alloy containing 1 wt% of Ca can be increased by 250 ℃, and meanwhile, the density of the magnesium alloy is not increased by adding Ca into the magnesium alloy. The rare earth element Sm can play a strong role in strengthening the aging of the magnesium alloy, and is helpful to improve the flame retardant property of the magnesium alloy in the smelting process. In the solidification process of the die-casting process, Sm and Al react in situ to generate Al2The Sm phase can perform the function of refining grains of Mg, improve the strength of the alloy and improve the plasticity and toughness of the alloy. The mechanical property of the material can be improved by adding Zn element in trace amount on the premise of not influencing the casting property.
The preparation process comprises the following steps:
all raw materials are goldPreheating the ingot at 180-220 deg.c for over 3 hr, preheating the crucible in well-type resistance furnace to 300 deg.c, putting magnesium ingot in the crucible, introducing SF6With CO2Mixed protective atmosphere (SF)6With CO2The volume ratio is 1: 100) and heating to 700 ℃ to melt the mixture.
And after the magnesium ingot is completely melted, adding pure Zn, pure A1 and pure Ca ingot, and preserving heat for 5-15 minutes. And (3) heating to 730 ℃, uniformly stirring, then putting the preheated Mg-Sm intermediate alloy into a crucible, and preserving heat for 15-25 minutes.
And after the alloy elements are completely melted and uniformly mixed, heating to 750-780 ℃, and adding a JDMJ refining agent to refine the alloy liquid for 10-15 minutes. After refining, the power is cut off, and the metal is cooled to 730-750 ℃. Keeping the temperature for 15 minutes and removing slag.
Keeping the temperature of the alloy liquid at 730-750 ℃, spraying the coating on the die cavity of the die-casting die, preheating to 150-300 ℃, casting the molten metal into the die by adopting a tundish, and starting the die-casting process. The pressure in the die casting process is 50-100 MPa, the pouring temperature is 680-750 ℃, the pressure maintaining time is 3-30 s, and the mold leaving time is 10-15 s.
Compared with the prior art, the invention has the following beneficial effects:
aiming at the problem that magnesium alloy developed in the background technology is particularly poor in plasticity, Al2Sm phase refined magnesium alloy matrix is formed by adding Al and Sm, partial Ca-rich phase is consumed in grain boundary residue, and the plasticity deterioration phenomenon caused by adding Ca is weakened. Namely, a flame-retardant magnesium alloy with high plasticity is developed. Meanwhile, the small amount of Ca and part of Sm are added in a compounding way to synergistically improve respective flame retardant effects, so that economic consideration is also provided. The Mg-Sm-Al-Ca-Zn alloy provided by the invention has good flame retardant effect and high plasticity in an as-cast state, has good casting fluidity and mechanical property, is suitable for production of a die-casting process, and has good industrial application prospect.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of the optical metallographic structure of a material sample obtained by melting and casting a Mg-2 wt.% Sm-9 wt.% Al-0.3 wt.% Zn-0.5 wt.% Ca alloy;
FIG. 2 is a schematic diagram of the optical metallographic structure of a material sample obtained by melting and casting a Mg-4 wt.% Sm-6 wt.% Al-0.8 wt.% Zn-1.5 wt.% Ca alloy;
FIG. 3 is a schematic diagram of the optical metallographic structure of a material sample obtained by melting and casting a Mg-6 wt.% Sm-3 wt.% Al-0.5 wt.% Zn-2.5 wt.% Ca alloy;
FIG. 4 is a schematic diagram of the optical metallographic structure of a material sample obtained by melting and casting an alloy of Mg-8 wt.% Sm-2 wt.% Al-1 wt.% Zn-0.5 wt.% Ca.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The magnesium alloy used in the embodiment of the invention is Mg-Sm-Al-Zn-Ca flame-retardant magnesium alloy which comprises the following components in percentage by weight: 2-8 wt.% of Sm, 2-9 wt.% of Al, 0.3-1 wt.% of Zn, 0.5-2.5 wt.% of Ca, less than or equal to 0.2% of total amount of impurity elements, and the balance of Mg.
The specific embodiment is as follows:
example 1:
the embodiment provides a high-plasticity flame-retardant die-casting magnesium alloy which comprises the following components in percentage by mass: 2% of Sm, 9% of Al, 0.3% of Zn, 0.5% of Ca, less than or equal to 0.2% of total amount of impurity elements and the balance of Mg, and the preparation process comprises the following steps:
preheating raw material metal ingot at 180-220 ℃ for more than 3 hours, placing a crucible in a well-type resistance furnace for preheating to 300 ℃, then placing the magnesium ingot in the crucible, and introducing SF6With CO2And heating to 700 ℃ to melt the mixture.
And after the magnesium ingot is completely melted, heating to 700 ℃, adding pure Zn, pure A1 and pure Ca ingot, and preserving heat for 5-15 minutes. And (3) heating to 730 ℃, uniformly stirring, then putting the preheated Mg-Sm intermediate alloy into a crucible, and preserving heat for 15-25 minutes.
And after the alloy elements are completely melted and uniformly mixed, heating to 750-780 ℃, and adding a JDMJ refining agent to refine the alloy liquid for 10-15 minutes. After refining, the power is cut off, and the metal is cooled to 730-750 ℃. Keeping the temperature for 15 minutes and removing slag.
Keeping the temperature of the alloy liquid at 730-750 ℃, spraying boron nitride coating on a die cavity of the die-casting die, preheating to 150-300 ℃, casting the molten metal into the die by adopting a tundish, and starting the die-casting process. The injection pressure during die casting is 50MPa, the pouring temperature is 680 ℃, the pressure maintaining time is 3s, and the mold retaining time is 10 s.
When a standard test bar die is used for a die-casting test, the schematic diagram of the optical metallographic structure of the magnesium alloy prepared in this example is shown in fig. 1, and it can be seen that Al in a square or polygon shape is present2The Sm granular phase is used as a heterogeneous nucleation core of magnesium grains, the grain size is about 25-30 microns, and the Sm granular phase has a certain refining effect compared with the conventional die-casting magnesium alloy; the as-cast room-temperature tensile property and the flame retardant property of the alloy are listed in Table 1, the as-cast elongation reaches 20 percent and exceeds the as-cast elongation of most of die-cast magnesium alloys, and meanwhile, the flame retardant property is obviously improved compared with magnesium-aluminum alloys.
Example 2:
the embodiment provides a high-plasticity flame-retardant die-casting magnesium alloy which comprises the following components in percentage by mass: 4% of Sm, 6% of Al, 0.8% of Zn, 1.5% of Ca, less than or equal to 0.2% of total amount of impurity elements and the balance of Mg, and the preparation process comprises the following steps:
preheating raw material metal ingot at 180-220 ℃ for more than 3 hours, placing a crucible in a well-type resistance furnace for preheating to 300 ℃, then placing the magnesium ingot in the crucible, and introducing SF6With CO2And heating to 700 ℃ to melt the mixture.
And after the magnesium ingot is completely melted, heating to 700 ℃, adding pure Zn, pure A1 and pure Ca ingot, and preserving heat for 5-15 minutes. And (3) heating to 730 ℃, uniformly stirring, then putting the preheated Mg-Sm intermediate alloy into a crucible, and preserving heat for 15-25 minutes.
And after the alloy elements are completely melted and uniformly mixed, heating to 750-780 ℃, and adding a JDMJ refining agent to refine the alloy liquid for 10-15 minutes. After refining, the power is cut off, and the metal is cooled to 730-750 ℃. Keeping the temperature for 15 minutes and removing slag.
Keeping the temperature of the alloy liquid at 730-750 ℃, spraying boron nitride coating on a die cavity of the die-casting die, preheating to 150-300 ℃, casting the molten metal into the die by adopting a tundish, and starting the die-casting process. The injection pressure during die casting is 80MPa, the pouring temperature is 700 ℃, the pressure maintaining time is 30s, and the mold retaining time is 15 s.
When a standard test bar die is used for a die-casting test, the schematic diagram of the optical metallographic structure of the magnesium alloy prepared in this example is shown in fig. 2, and it can be seen that Al in a square or polygon shape is present2The Sm particle phase is used as a heterogeneous nucleation core of magnesium grains, the particle density of the Sm particle phase is obviously increased compared with that of example 1, and the Sm particle phase is further refined compared with that of example 1; the as-cast room-temperature tensile properties and flame retardancy of the alloy are shown in Table 1, and compared with example 1, the as-cast elongation is reduced due to the higher Ca content, but the plasticity of the alloy is still much higher than that of the alloy with the equivalent Ca content in the conventional alloy; meanwhile, the flame retardant property is greatly improved.
Example 3:
the embodiment provides a high-plasticity flame-retardant die-casting magnesium alloy which comprises the following components in percentage by mass: 6 percent of Sm, 3 percent of Al, 0.5 percent of Zn, 2.5 percent of Ca, less than or equal to 0.2 percent of impurity elements and the balance of Mg, and the preparation process comprises the following steps:
preheating raw material metal ingot at 180-220 ℃ for more than 3 hours, placing a crucible in a well-type resistance furnace for preheating to 300 ℃, then placing the magnesium ingot in the crucible, and introducing SF6With CO2And heating to 700 ℃ to melt the mixture.
And after the magnesium ingot is completely melted, heating to 700 ℃, adding pure Zn, pure A1 and pure Ca ingot, and preserving heat for 5-15 minutes. And (3) heating to 730 ℃, uniformly stirring, then putting the preheated Mg-Sm intermediate alloy into a crucible, and preserving heat for 15-25 minutes.
And after the alloy elements are completely melted and uniformly mixed, heating to 750-780 ℃, and adding a JDMJ refining agent to refine the alloy liquid for 10-15 minutes. After refining, the power is cut off, and the metal is cooled to 730-750 ℃. Keeping the temperature for 15 minutes and removing slag.
Keeping the temperature of the alloy liquid at 730-750 ℃, spraying boron nitride coating on a die cavity of the die-casting die, preheating to 150-300 ℃, casting the molten metal into the die by adopting a tundish, and starting the die-casting process. The injection pressure during die casting is 100MPa, the pouring temperature is 720 ℃, the pressure maintaining time is 30s, and the mold retaining time is 15 s.
When a standard test bar die is used for a die-casting test, the schematic diagram of the optical metallographic structure of the magnesium alloy prepared in the embodiment is shown in fig. 3, and compared with the magnesium alloy prepared in the embodiments 1 and 2, the magnesium alloy prepared in the embodiment has the advantages that the Al with higher particle density and smaller size is observed2The Sm granular phase is used as a heterogeneous nucleation core of magnesium grains, and the grains are correspondingly further refined. The as-cast room-temperature tensile properties and flame retardancy of the alloy are shown in Table 1, and compared with examples 1 and 2, the yield strength is obviously improved due to grain refinement and rare earth content increase, while the Ca content exceeds the solid solution limit of the Ca in magnesium, so that the as-cast elongation is reduced, but the plasticity of the alloy is far higher than that of the alloy with the equivalent content of Ca element in the conventional alloy; meanwhile, the flame retardant property is greatly improved.
Example 4:
the embodiment provides a high-plasticity flame-retardant die-casting magnesium alloy which comprises the following components in percentage by mass: 8 percent of Sm, 2 percent of Al, 1 percent of Zn, 0.5 percent of Ca, less than or equal to 0.2 percent of impurity element total amount and the balance of Mg, and the preparation process comprises the following steps:
preheating raw material metal ingot at 180-220 ℃ for more than 3 hours, placing a crucible in a well-type resistance furnace for preheating to 300 ℃, then placing the magnesium ingot in the crucible, and introducing SF6With CO2And heating to 700 ℃ to melt the mixture.
And after the magnesium ingot is completely melted, heating to 700 ℃, adding pure Zn, pure A1 and pure Ca ingot, and preserving heat for 5-15 minutes. And (3) heating to 730 ℃, uniformly stirring, then putting the preheated Mg-Sm intermediate alloy into a crucible, and preserving heat for 15-25 minutes.
And after the alloy elements are completely melted and uniformly mixed, heating to 750-780 ℃, and adding a JDMJ refining agent to refine the alloy liquid for 10-15 minutes. After refining, the power is cut off, and the metal is cooled to 730-750 ℃. Keeping the temperature for 15 minutes and removing slag.
Keeping the temperature of the alloy liquid at 730-750 ℃, spraying boron nitride coating on a die cavity of the die-casting die, preheating to 150-300 ℃, casting the molten metal into the die by adopting a tundish, and starting the die-casting process. The injection pressure during die casting is 100MPa, the pouring temperature is 750 ℃, the pressure maintaining time is 30s, and the mold retaining time is 15 s.
When a standard test bar die is used for a die-casting test, the schematic diagram of the optical metallographic structure of the magnesium alloy prepared in the embodiment is shown in fig. 4, and compared with the magnesium alloy prepared in the embodiments 1 and 2, the magnesium alloy prepared in the embodiment has the advantages that the Al with higher particle density and smaller size is observed2The Sm granular phase is used as a heterogeneous nucleation core of magnesium grains, the grains are correspondingly further refined, and the addition of the rare earth elements also promotes the generation of other rare earth-rich rod-shaped phases, which actively contributes to the improvement of the elongation percentage. The as-cast room temperature tensile properties and flame retardant properties of the alloy are listed in table 1, and compared with the previous examples, the yield strength is obviously improved due to further refinement of crystal grains and increase of rare earth content; and the reduction of the content of Ca ensures that the product has equivalent flame retardant performance, and simultaneously, the cast elongation reaches 22 percent and the tensile strength also reaches 280 MPa.
Based on the verification of the above examples, the mechanical properties and flame retardant properties are tested as shown in table 1 below:
TABLE 1 As-cast Room temperature tensile Properties and flame retardant Properties of alloy samples of the examples
In conclusion, the high-plasticity flame-retardant die-casting magnesium alloy comprises the following components in percentage by mass: 2-8 wt.% of Sm, 2-9 wt.% of Al, 0.3-1 wt.% of Zn, 0.5-2.5 wt.% of Ca, less than or equal to 0.2% of total amount of impurity elements, and the balance of Mg. The ignition point of the high-pressure cast magnesium alloy can be improved to a great extent, and high plasticity is ensured, so that the high-pressure cast magnesium alloy has important application prospect.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (7)
1. The high-plasticity flame-retardant die-casting magnesium alloy is characterized in that the high-plasticity flame-retardant die-casting magnesium alloy comprises the following alloy elements in percentage by mass:
Sm 2％～8％；
Al 2％～9％；
Zn 0.3％～1％；
Ca 0.5％～2.5％；
the total amount of impurity elements is less than or equal to 0.2 percent;
the balance being magnesium.
2. The preparation method of the high-plasticity flame-retardant die-casting magnesium alloy according to claim 1, which is characterized by comprising the following specific steps:
(1) preheating all raw material metal ingots, and placing a crucible in a well-type resistance furnace for preheating;
(2) then putting the magnesium ingot into a crucible, introducing protective gas, and heating to melt the magnesium ingot;
(3) after the magnesium ingot is completely melted, adding pure Zn, pure A1 and pure Ca ingot, keeping the temperature, heating, uniformly stirring, putting the preheated Mg-Sm intermediate alloy into a crucible, and keeping the temperature;
(4) after the alloy elements are completely melted and uniformly mixed, heating, adding a refining agent to refine the alloy liquid, cutting off the power after the refining is finished, cooling the metal to a certain temperature, preserving the heat, and slagging off;
(5) and keeping the temperature of the alloy liquid, spraying the coating on the die cavity of the die-casting die, preheating the die-casting die, casting the molten metal into the die-casting die by adopting a tundish, and performing die-casting to obtain the high-plasticity flame-retardant die-casting magnesium alloy.
3. The method for preparing a highly plastic flame-retardant die-cast magnesium alloy as claimed in claim 2, wherein in the step (1), all the raw material ingots are preheated at 180 ℃ to 220 ℃ for more than 3 hours, and the crucible is placed in a well-type resistance furnace to be preheated to 300 ℃.
4. The method for preparing high-plasticity flame-retardant die-casting magnesium alloy according to claim 2, wherein in the step (2), the protective gas is SF6With CO2Mixed shielding gas of (SF)6With CO2Is 1: 100, heating to 700 ℃.
5. The preparation method of the high-plasticity flame-retardant die-casting magnesium alloy according to claim 2, wherein in the step (3), the temperature is kept for 5-15 minutes, the temperature is raised to 730 ℃, and the temperature is kept for 15-25 minutes.
6. The method for preparing the high-plasticity flame-retardant die-casting magnesium alloy according to claim 2, wherein in the step (4), the temperature is increased to 750-780 ℃; the refining agent is a JDMJ refining agent and is refined for 10-15 minutes; cooling to 730-750 deg.c and maintaining for 15 min.
7. The method for preparing a highly plastic flame-retardant die-casting magnesium alloy according to claim 2, wherein in the step (5), the temperature of the alloy liquid is maintained at 730-750 ℃, the coating is boron nitride, the die-casting mold is preheated to 150-300 ℃, the pressure during the die-casting process is 50-100 MPa, the casting temperature is 680-750 ℃, the pressure holding time is 3-30 s, and the mold holding time is 10-15 s.
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| CN113373398A (en) * | 2021-06-24 | 2021-09-10 | 重庆大学 | Flame-retardant magnesium alloy part |
| CN115449682A (en) * | 2022-09-28 | 2022-12-09 | 广东汇天航空航天科技有限公司 | Magnesium-based alloy compounded by rare earth and alkaline earth elements and preparation method thereof |
| RU2798498C1 (en) * | 2022-07-12 | 2023-06-23 | Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский государственный университет" | Method for producing magnesium alloys of the magnesium-zinc-calcium system and device for its implementation |
| CN116334462A (en) * | 2023-04-07 | 2023-06-27 | 中国科学院长春应用化学研究所 | Rare earth magnesium alloy and preparation method thereof |
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| CN113373398A (en) * | 2021-06-24 | 2021-09-10 | 重庆大学 | Flame-retardant magnesium alloy part |
| RU2798498C1 (en) * | 2022-07-12 | 2023-06-23 | Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский государственный университет" | Method for producing magnesium alloys of the magnesium-zinc-calcium system and device for its implementation |
| CN115449682A (en) * | 2022-09-28 | 2022-12-09 | 广东汇天航空航天科技有限公司 | Magnesium-based alloy compounded by rare earth and alkaline earth elements and preparation method thereof |
| WO2024066022A1 (en) * | 2022-09-28 | 2024-04-04 | 广东汇天航空航天科技有限公司 | Rare earth-alkaline earth element compounded magnesium-based alloy and preparation method therefor |
| CN115449682B (en) * | 2022-09-28 | 2024-04-26 | 广东汇天航空航天科技有限公司 | Rare earth and alkaline earth element compounded magnesium-based alloy and preparation method thereof |
| CN116334462A (en) * | 2023-04-07 | 2023-06-27 | 中国科学院长春应用化学研究所 | Rare earth magnesium alloy and preparation method thereof |
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| CN112143951B (en) | 2022-01-11 |
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