WO2021088612A1 - Lpso phase fortified high-damping rare earth magnesium alloy and preparation method therefor - Google Patents

Abstract

Disclosed are an LPSO phase fortified high-damping rare earth magnesium alloy and a preparation method therefor. The magnesium alloy comprises, in weight percent, 2.7-3.8% of rare earth elements, 0.8-1.5% of Zn, 0.5-1.0% of Mn, and the balance being Mg. The magnesium alloy comprises an LPSO phase having a special long period structure. The LPSO phase can enhance damping performance of the alloy while increasing comprehensive mechanical properties thereof, thus offering a tough and high-damping rare earth magnesium alloy. The LPSO phase fortified high-damping rare earth magnesium alloy is prepared by a method in which a semi-continuous casting process is employed. The rare earth magnesium alloy obtained has high mechanical properties and high damping performance, with a tensile strength of 180 MPa or higher, an elongation rate of 10% or higher and a damping value of 0.065 or higher. The magnesium alloy boasts a high product yield rate and a good machining and forming properties, is easy to industrialize, and can be widely used in sound transmission apparatuses, such as speakers and earpieces.

Description

LPSO phase strengthened high damping rare earth magnesium alloy and preparation method thereof Technical field

The invention belongs to the technical field of non-ferrous metal materials, and specifically relates to an LPSO phase strengthened high damping rare earth magnesium alloy and a preparation method thereof.

Background technique

With the rapid development of modern science and technology, vibration and noise have become one of the three major public hazards. The development and application of damping materials is an important way to solve vibration failure and noise interference. As a new type of lightweight structural material, magnesium alloy has attracted more and more attention from experts, scholars and major companies. Magnesium alloy has the characteristics of low density, high specific strength and specific rigidity, easy recycling, low energy consumption and excellent shock and noise resistance. When the strain amplitude is 10 ^-4 , the damping internal friction value Q ^{-1 of} pure magnesium can reach 0.11. Lightweight and shock-absorbing high-performance magnesium alloy structural parts are used in the shock-absorbing components of speakers and earpieces, which can reduce the adverse effects of vibration and are beneficial to the high-quality transmission of audio signals.

The general standard for judging the damping value of a metal alloy is that: when the damping value is Q ^-1 ≥0.01, the metal alloy is considered to be a high damping alloy. Currently developed relatively mature high-damping magnesium alloy systems include Mg-Zr, Mg-Ni and Mg-Cu-Mn systems, and most of them are cast magnesium alloys. Although they all have excellent damping properties, the damping value can reach more than 0.05. However, its mechanical properties are poor, and its tensile strength is only about 150MPa. For example, the damping internal friction value Q ^-1 of Mg-3Cu-1Mn alloy can reach 0.1, but its tensile strength is only 149MPa. In addition, the poor corrosion resistance of Mg-Ni alloy limits its application prospects. While the currently widely used AZ magnesium alloys have higher mechanical properties and better corrosion resistance, their damping performance is nearly 10 times lower than that of other high-damping magnesium alloys. For example, the AZ80+0.4% Ce magnesium alloy studied by Yang Yaqin et al., the tensile strength of the alloy can reach more than 250MPa, while the damping internal friction value is only about 0.012.

Rare earth magnesium alloys have the advantages of good casting performance, excellent corrosion resistance and better mechanical properties. However, the research on high damping rare earth magnesium alloys is still in its infancy. Therefore, the development of high performance rare earth magnesium alloys with excellent mechanical properties and damping properties is very important Enriching the types of damping magnesium alloys and expanding the functionality of magnesium alloys is of great significance, and at the same time can provide a way out for expanding the application fields of magnesium alloys.

Summary of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an LPSO phase-strengthened high-damping rare earth magnesium alloy and a preparation method thereof. The storage capacity of the alloy can improve the damping performance of the alloy, and achieve the characteristics of both excellent mechanical properties and damping performance; the magnesium alloy obtained by the preparation method of the magnesium alloy has a high yield, good processing and formability, easy to realize industrialization, and can be widely used in In sound transmission equipment such as speakers and earpieces.

In order to achieve the above objectives, the present invention adopts the following technical solutions to achieve:

The invention discloses a LPSO phase strengthened high damping rare earth magnesium alloy. The raw material composition and weight percentage content of the magnesium alloy are as follows:

Rare earth elements: 2.7-3.8%, Zn: 0.8-1.2%, Mn: 0.5-1.0%, the balance is Mg.

Preferably, the rare earth element includes:

One of Y and Ce or a combination of the two, the weight percentage content of Y in the magnesium alloy is 2.2-2.8%, and the weight percentage content of Ce in the magnesium alloy is 0.5-1.0%.

Preferably, the mass ratio of Y to Zn is 2.3 to 2.8.

The invention discloses a preparation method of the above-mentioned LPSO phase strengthened high damping rare earth magnesium alloy, which comprises the following steps:

Step 1: Take magnesium ingots, Zn ingots, magnesium rare earth master alloys and MnCl ₂ particles as raw materials, weigh and prepare materials according to mass percentage;

Step 2: Preheat and dry the magnesium ingot in Step 1, and then heat and melt the magnesium ingot to form a magnesium liquid. Add the preheated Zn ingot, magnesium rare earth intermediate alloy and MnCl ₂ particles to the magnesium liquid in sequence, and add them while stirring The refining agent is smelted, the slag is removed after smelting, and finally the ingot is obtained by semi-continuous casting process, which is the LPSO phase strengthened high damping rare earth magnesium alloy.

Preferably, the mass percentage in step one is:

Rare earth elements: 2.7-3.8%, Zn: 0.8-1.2%, Mn: 0.5-1.0%, the balance is Mg.

Preferably, the magnesium rare earth master alloy in step 1 is one or a combination of Mg-25Y master alloy and Mg-20Ce master alloy.

Preferably, the weight percentage content of Y in the magnesium alloy in the magnesium rare earth master alloy is 2.2-2.8%, and the weight percentage content of Ce in the magnesium alloy is 0.5-1.0%.

Preferably, the temperature of the smelting process in step 2 is 650 to 720°C, and the temperature is maintained for 20 to 30 minutes.

Preferably, the addition amount of the refining agent in the smelting process of step two is 1 kg and 75-125 g of the refining agent is added to the raw material of step one.

Preferably, in step 1, the content of magnesium in the magnesium ingot is greater than 99.5 wt%, and the content of Zn in the Zn ingot is greater than 99.5 wt%.

Compared with the prior art, the present invention has the following beneficial effects:

The invention discloses a LPSO phase reinforced high damping rare earth magnesium alloy. The magnesium alloy adopts a Mg-RE (rare earth element)-Zn series alloy formula. RE mostly exists as a hard and brittle phase at the network grain boundary. The RE element and Zn are adjusted. The ratio of the elements obtains a rare earth magnesium alloy with high strength and high damping; on the one hand, the addition of trace Mn element can remove the harmful impurity element Fe, on the other hand, it can refine the grain.

Furthermore, by combining the light rare earth element Ce and the heavy rare earth element Y, the comprehensive strengthening effect of the light and heavy rare earths is exerted. Due to the difference in the solid solubility of light and heavy rare earths, light rare earth elements with smaller solid solubility can preferentially gather at the front of the solidification interface to refine the grains and achieve the effect of fine-grain strengthening. The solid solubility of heavy rare earth elements is large, and they can be dissolved in the magnesium matrix to improve the ratio of lattice constant c/a, and increase the probability of starting other slip systems outside the base surface, so as to achieve solid solution strengthening while improving Alloy plasticity.

Furthermore, the type of eutectic phase formed in the magnesium alloy during solidification depends on the ratio of Y element to Zn element. When the mass ratio of Y/Zn in the alloy is greater than 2.2, the main precipitated phase in the microstructure obtained is the LPSO phase. Therefore, by controlling the mass ratio of heavy rare earth elements Y and Zn in the range of 2.3 to 2.8, a rare earth magnesium alloy with LPSO phase (also called X-phase) as the main precipitation phase can be obtained. While the LPSO phase exerts the strengthening of the second phase by hindering the movement of dislocations, its own plastic deformation ability can slow down the stress concentration and improve the plasticity of the alloy. Therefore, the LPSO phase has been recognized as an effective strengthening phase for improving the comprehensive mechanical properties of magnesium alloys in recent years. While improving the strength, it is also beneficial to improve the plasticity of the alloy. The damping mechanism of magnesium alloy is a dislocation type damping mechanism, and the increase in the number of movable dislocations in the alloy can improve the damping performance. Because the LPSO phase has the ability to store dislocations, its own deformation can effectively increase the number of movable dislocations, which is beneficial to energy absorption, increases the internal friction value, and can improve the damping performance of the magnesium alloy. In addition, the Y element solid dissolved in the magnesium matrix can form a dislocation hysteresis loop through the process of pinning and unpinning by hindering the movable dislocation, thereby improving the damping performance of the alloy. Through the mechanical performance and damping performance test results, it is known that the alloy not only exhibits excellent comprehensive mechanical properties, but also has high damping performance.

The invention also discloses a preparation method of LPSO phase-strengthened high-damping rare-earth magnesium alloy. The method obtains a series of high-damping rare-earth magnesium alloys with LPSO structure through reasonable heating and melting and semi-continuous casting processes. The tensile strength of the magnesium alloy is Engineering stress can reach 180MPa, the elongation Engineering strain can reach more than 10%, and the internal friction value of damping

Up to 0.065.

The magnesium alloy of the present invention can efficiently exert the high damping functionality of rare earth elements in the magnesium alloy, and at the same time has excellent comprehensive mechanical properties, is easy to realize industrialization, and can be widely used in sound transmission equipment components.

Description of the drawings

Figure 1a is an SEM image of a magnesium alloy in Example 1;

Figure 1b is an SEM image of the magnesium alloy in Example 2;

Figure 1c is an SEM image of the magnesium alloy of Example 3;

Figure 1d is an SEM image of a magnesium alloy in Comparative Example 1;

Figure 1e is an SEM image of a comparative example of two magnesium alloys;

Figure 2 is a graph showing the damping performance test curve of the magnesium alloy of the embodiment and the comparative example;

Fig. 3 is a graph showing the tensile properties of magnesium alloys of Examples and Comparative Examples.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the implementation of the present invention and the accompanying drawings. Obviously, the described embodiments are only the present invention. Invented a part of the embodiments, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

It should be noted that the terms “first” and “second” in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those clearly listed. Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

The present invention will be further described in detail below in conjunction with the accompanying drawings:

The composition of the raw material of the refining agent and its weight percentage content are: 55%-60% KCl, 2%-5% CaF ₂ , the rest is BaCl ₂ , the amount of refining agent added is 75 per kg of raw material -125g.

Example one

This embodiment provides an LPSO phase strengthened high damping rare earth magnesium alloy. The raw material composition and weight percentage content are: rare earth element: 2.7%, Zn: 0.8%, Mn: 0.5%, and the balance is Mg.

The rare earth elements in this embodiment include Y and Ce, the weight percentage of Y in the magnesium alloy is 2.2%, and the weight percentage of Ce in the magnesium alloy is 0.5%. The mass ratio of Y and Zn is 2.75.

The preparation method of the LPSO phase strengthened high damping rare earth magnesium alloy includes the following steps:

Step 1: Use pure magnesium ingot (99.5wt% or more), pure Zn ingot (99.5wt% or more), Mg-25Y master alloy (that is, the composition content of the master alloy is: 25wt% Y, the balance is Mg) and Mg- 20Ce master alloy and MnCl ₂ particles as raw materials, weigh and prepare the materials according to the mass percentage of Y 2.2wt%, Ce 0.5wt%, Zn 0.8wt%, Mn 0.5wt%, and the balance Mg, the total amount of raw materials is 1kg;

Step 2: Preheat and dry the pure magnesium ingots in step 1 at 180°C, then heat the pure magnesium ingots in a crucible in a resistance furnace to 650°C and gradually melt them. After the magnesium ingots are completely melted, a magnesium liquid will be formed. The pure Zn ingot preheated at 180℃, Mg-25Y master alloy, Mg-20Ce master alloy and MnCl ₂ particles are added to the magnesium liquid for smelting. While stirring, slowly add 75g of refining agent, control the smelting temperature at 720℃, and keep warm. 30min, after removing the slag, the semi-continuous casting process is used to cast the ingot, which is an LPSO phase strengthened high damping rare earth magnesium alloy.

The LPSO phase-strengthened high-damping rare earth magnesium alloy obtained in this example is scanned as shown in Fig. 1a. The damping performance of the alloy is tested by DMA850, and the damping value of the alloy can reach 0.065 at room temperature; the MTS810 mechanical test system is used for the alloy mechanics The performance is tested, the tensile strength of the alloy is 187MPa, and the elongation is 10.0%.

Example two

This embodiment provides an LPSO phase strengthened high damping rare earth magnesium alloy. The raw material composition and weight percentage content are: rare earth element: 3.2%, Zn: 1.0%, Mn: 0.6%, and the balance is Mg.

The rare earth elements in this embodiment include Y and Ce, the weight percentage of Y in the magnesium alloy is 2.5%, and the weight percentage of Ce in the magnesium alloy is 0.8%. The mass ratio of Y and Zn is 2.5.

The preparation method of the LPSO phase strengthened high damping rare earth magnesium alloy includes the following steps:

Step 1: Use pure magnesium ingot (99.5wt% or more), pure Zn ingot (99.5wt% or more), Mg-25Y master alloy, Mg-20Ce master alloy and MnCl ₂ particles as raw materials, according to Y 2.5wt%, Ce 0.8wt %, Zn 1.0wt%, Mn 0.6wt%, and the balance is the weight percentage of Mg. The total amount of raw materials is 1kg;

Step 2: Preheat and dry the pure magnesium ingots in step one at 230°C, then heat the pure magnesium ingots in a crucible in a resistance furnace to 680°C and gradually melt them, and form magnesium liquid after the magnesium ingots are completely melted. The pure Zn ingots, Mg-25Y master alloy, Mg-20Ce master alloy and MnCl ₂ particles preheated at 230℃ are added to the magnesium liquid for smelting. While stirring, the refining agent is added to smelt 100g, the smelting temperature is 680℃, and the holding time is 25min. After slag removal, a semi-continuous casting process is used to cast an ingot, which is an LPSO phase strengthened high damping rare earth magnesium alloy.

The LPSO phase-strengthened high-damping rare earth magnesium alloy obtained in this example is scanned as shown in Fig. 1b. The damping performance of the alloy is tested by DMA850, and the damping value of the alloy can reach 0.068 at room temperature; the MTS810 mechanical test system is used for the alloy mechanics The performance was tested, the alloy's tensile strength was 185MPa, and the elongation was 10.2%.

Example three

This embodiment provides an LPSO phase strengthened high damping rare earth magnesium alloy. The raw material composition and weight percentage content are: rare earth element: 3.8%, Zn: 1.2%, Mn: 1.0%, and the balance is Mg.

The rare earth elements in this embodiment include Y and Ce, the weight percentage of Y in the magnesium alloy is 2.8%, and the weight percentage of Ce in the magnesium alloy is 1.0%. The mass ratio of Y and Zn is about 2.33.

The preparation method of the LPSO phase strengthened high damping rare earth magnesium alloy includes the following steps:

Step 1: Use pure magnesium ingot (99.5wt% or more), pure Zn ingot (99.5wt% or more), Mg-25Y master alloy, Mg-20Ce master alloy and MnCl ₂ particles as raw materials, according to Y 2.8wt%, Ce 1.0wt %, Zn 1.2wt%, Mn 1.0wt%, and the balance is the weight percentage of Mg. The total amount of raw materials is 1kg;

Step 2: Preheat and dry the pure magnesium ingots in step one at 230°C, then heat the pure magnesium ingots in a crucible in a resistance furnace to 680°C and gradually melt them, and form magnesium liquid after the magnesium ingots are completely melted. The pure Zn ingots, Mg-25Y master alloy, Mg-20Ce master alloy and MnCl ₂ particles preheated at 230℃ are added to the magnesium liquid for smelting. Slowly add 125g refining agent while stirring. The smelting temperature is 650℃ and the temperature is kept for 20min. After slag removal, a semi-continuous casting process is used to cast an ingot, which is an LPSO phase strengthened high damping rare earth magnesium alloy.

The LPSO phase-strengthened high damping rare earth magnesium alloy obtained in this example is scanned as shown in Fig. 1c. The damping performance of the alloy is tested by DMA850, and the damping value of the alloy can reach 0.071 at room temperature; the MTS810 mechanical test system is used for the alloy mechanics The performance was tested, the alloy's tensile strength was 181MPa, and the elongation was 10.9%.

Comparative example one

The first comparative example provides a W-phase reinforced rare earth magnesium alloy. The raw material composition and weight percentage content are: rare earth element: 3.5%, Zn: 4.6%, Mn: 0.6%, and the balance is Mg.

The rare earth elements in this embodiment include Y and Ce, the weight percentage of Y in the magnesium alloy is 2.5%, and the weight percentage of Ce in the magnesium alloy is 1.0%. The mass ratio of Y and Zn is 0.54.

The preparation method of the W-containing phase strengthened rare earth magnesium alloy includes the following steps:

Step 1: Use pure magnesium ingot (99.5wt% or more), pure Zn ingot (99.5wt% or more), Mg-25Y master alloy, Mg-20Ce master alloy and MnCl ₂ particles as raw materials, according to Y 2.5wt%, Ce 1.0wt %, Zn 4.6wt%, Mn 0.6wt%, and the balance is the weight percentage of Mg for weighing and preparing materials, the total amount of raw materials is 1kg;

Step 2: Preheat and dry the pure magnesium ingots in step 1 at 180°C, then heat the pure magnesium ingots in a crucible in a resistance furnace to 650°C and gradually melt them. After the magnesium ingots are completely melted, a magnesium liquid will be formed. The pure Zn ingot, Mg-25Y master alloy, Mg-20Ce master alloy and MnCl ₂ particles preheated at 180℃ are added to the magnesium liquid for smelting. Slowly add 120g of refining agent while stirring. The smelting temperature is 700℃ and the temperature is kept for 25min. After slag removal, a semi-continuous casting process is used to cast to obtain an ingot, which is a W-phase reinforced rare earth magnesium alloy.

The scan diagram of the W-phase reinforced rare earth magnesium alloy obtained in this example is shown in Figure 1d. The damping performance of the alloy is tested by DMA850, and the damping value of the alloy can reach 0.027 at room temperature; the mechanical properties of the alloy are measured by the MTS810 mechanical test system When tested, the alloy has a tensile strength of 196MPa and an elongation of 8.7%.

Comparative example two

The second comparative example provides a rare earth magnesium alloy containing Mg-RE phase. The raw material composition and weight percentage content are: rare earth element: 3.8%, Mn: 1.0%, and the balance is Mg.

The rare earth elements in this embodiment include Y and Ce, the weight percentage of Y in the magnesium alloy is 2.8%, and the weight percentage of Ce in the magnesium alloy is 1.0%. The mass ratio of Y and Zn is 0.54.

The preparation method of the rare earth magnesium alloy containing Mg-RE phase includes the following steps:

Step 1: Take pure magnesium ingot (above 99.5wt%), Mg-25Y master alloy, Mg-20Ce master alloy and MnCl ₂ particles as raw materials, according to Y 2.8wt%, Ce 1.0wt%, Mn 1.0wt%, the balance is The weight percentage of Mg is weighed and prepared, and the total amount of raw materials is 1kg;

Step 2: Preheat and dry the pure magnesium ingots in step one at 230°C, then heat the pure magnesium ingots in a crucible in a resistance furnace to 680°C and gradually melt them, and form magnesium liquid after the magnesium ingots are completely melted. Mg-25Y master alloy, Mg-20Ce master alloy and MnCl ₂ particles preheated at 230℃ were added to the magnesium liquid for smelting. While stirring, slowly add 110g refining agent. The smelting temperature was 650℃ and the temperature was kept for 20 minutes. The semi-continuous casting process is cast to obtain an ingot, which is a rare earth magnesium alloy containing Mg-RE phase.

The Mg-RE phase-strengthened rare earth magnesium alloy obtained in this example is scanned as shown in Fig. 1e. The damping performance of the alloy is tested by DMA850, and the damping value of the alloy can reach 0.060 at room temperature; the MTS810 mechanical test system is used for the alloy The mechanical properties were tested, and the alloy's tensile strength was 138MPa, and the elongation was 6.9%.

The main chemical components and preparation parameters of all the examples are shown in Table 1:

Table 1 The main chemical components and preparation parameters of the magnesium alloy of the embodiment

alloy	Y/%	Ce/%	Zn/%	Mn/%	Mg	Melting temperature/℃	Holding time
Example 1	2.2	0.5	0.8	0.5	margin	720	30
Example 2	2.5	0.8	1.0	0.6	margin	680	25
Example 3	2.8	1.0	1.2	1.0	margin	650	20
Comparative example 1	2.5	1.0	4.6	0.6	margin	680	25

Comparative example 2

2.8

1.0

0

1.0

margin

650

20

To sum up, referring to Figure 1a, Figure 1b, Figure 1c, Figure 1d, Figure 1e and Figure 2, compare Example 2 with Comparative Example 1. When the formulation of the raw materials is changed, the obtained Example 2 The magnesium alloy contains LPSO phase, while the magnesium alloy in Comparative Example 1 does not contain LPSO phase and contains W-phase. While the alloys in Example 2 and Comparative Example 1 have considerable comprehensive mechanical properties, the damping of the magnesium alloy in Example 2 The performance is much higher than that of the W-phase strengthened rare earth magnesium alloy in Comparative Example 1.

Referring to Figure 1a, Figure 1b, Figure 1c, Figure 1d, Figure 1e, Figure 2 and Figure 3, compare Example 3 and Comparative Example 2. When the formula in the raw material ratio is changed, the magnesium alloy in Example 3 is obtained Contains LPSO phase, while the magnesium alloy in Comparative Example 2 does not contain LPSO phase and contains a small amount of Mg-RE phase. The tensile strength of the magnesium alloy in Example 3 and Comparative Example 2 when the alloy has comparable damping properties And the elongation is much higher than that of the rare earth magnesium alloy containing Mg-RE phase in Comparative Example 2.

The above content is only to illustrate the technical ideas of the present invention, and cannot be used to limit the scope of protection of the present invention. Any changes made on the basis of the technical solutions based on the technical ideas proposed by the present invention fall into the claims of the present invention. Within the scope of protection.

Claims (10)

1. An LPSO phase strengthened high damping rare earth magnesium alloy, characterized in that the raw material composition of the magnesium alloy and its weight percentage content are:

   Rare earth elements: 2.7-3.8%, Zn: 0.8-1.2%, Mn: 0.5-1.0%, the balance is Mg.
2. The LPSO phase strengthened high damping rare earth magnesium alloy according to claim 1, wherein the rare earth element comprises:

   One of Y and Ce or a combination of the two, the weight percentage content of Y in the magnesium alloy is 2.2-2.8%, and the weight percentage content of Ce in the magnesium alloy is 0.5-1.0%.
3. The LPSO phase strengthened high damping rare earth magnesium alloy according to claim 2, wherein the mass ratio of Y to Zn is 2.3 to 2.8.
4. A method for preparing the LPSO phase strengthened high damping rare earth magnesium alloy according to any one of claims 1 to 3, characterized in that it comprises the following steps:

   Step 1: Take magnesium ingots, Zn ingots, magnesium rare earth master alloys and MnCl ₂ particles as raw materials, weigh and prepare materials according to mass percentage;

   Step 2: Preheat and dry the magnesium ingot in Step 1, and then heat and melt the magnesium ingot to form a magnesium liquid. Add the preheated Zn ingot, magnesium rare earth intermediate alloy and MnCl ₂ particles to the magnesium liquid in sequence, and add them while stirring The refining agent is smelted, the slag is removed after smelting, and finally the ingot is obtained by semi-continuous casting process, which is the LPSO phase strengthened high damping rare earth magnesium alloy.
5. The method for preparing an LPSO phase-strengthened high-damping rare earth magnesium alloy according to claim 4, wherein the mass percentage in step one is:

   Rare earth elements: 2.7-3.8%, Zn: 0.8-1.2%, Mn: 0.5-1.0%, the balance is Mg.
6. The method for preparing an LPSO phase strengthened high damping rare earth magnesium alloy according to claim 4, wherein the magnesium rare earth master alloy in step one is one of Mg-25Y master alloy and Mg-20Ce master alloy Or a combination of the two.
7. The method for preparing LPSO phase-strengthened high damping rare earth magnesium alloy according to claim 6, wherein the weight percentage content of Y in the magnesium alloy in the magnesium rare earth master alloy is 2.2 to 2.8%, and Ce The weight percentage content in the magnesium alloy is 0.5-1.0%.
8. The method for preparing an LPSO phase-strengthened high-damping rare earth magnesium alloy according to claim 4, characterized in that the temperature of the smelting process in step two is 650-720°C, and the holding time is 20-30 minutes.
9. The method for preparing an LPSO phase-strengthened high-damping rare earth magnesium alloy according to claim 4, wherein the amount of the refining agent added in the smelting process of step 2 is 1 kg and the raw material of step 1 is added with a refining agent 75~ 125g.
10. The method for preparing an LPSO phase-strengthened high-damping rare earth magnesium alloy according to claim 4, wherein the content of magnesium in the magnesium ingot is greater than 99.5% by weight, and the content of Zn in the Zn ingot is greater than 99.5% by weight .

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