CN113444903A - High-gadolinium rare earth magnesium alloy bar and preparation method thereof - Google Patents
High-gadolinium rare earth magnesium alloy bar and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high gadolinium rare earth magnesium alloy bar and a preparation method thereof, wherein the bar comprises the following components in percentage by mass: 8.0-10.0% of Gd, 1-3% of Bi, 2-4% of Y, 1-3% of Sm, 0.1-0.5% of Zr, and the balance of Mg and inevitable impurities. Through the regulation and control of alloying and heat treatment processes, the extrusion forming of the high gadolinium rare earth magnesium alloy at the speed of 4.1m/min is realized under the conditions that the extrusion ratio is 10-25 and the extrusion temperature is 510-520 ℃. Gd. Sm, Y and Bi form rare earth compounds with high thermal stability and Mg3Bi2 phase in the alloy, and the hot cracking tendency of the alloy under high-temperature and high-speed extrusion is remarkably reduced. The solid solution strengthening and precipitation strengthening effects of the alloy are enhanced by the compound addition of the multiple elements. The extrusion bar can realize high strength through further heat treatment, and the highest tensile strength and yield strength of the extrusion bar can reach 383MPa and 317 MPa. The invention solves the problem of higher deformation sensitivity of the high gadolinium rare earth magnesium alloy, and provides a solution for the problem that the production cost of the high gadolinium rare earth magnesium alloy is greatly improved due to low extrusion efficiency.
Description
Technical Field
The invention relates to the technical field of magnesium alloy materials, in particular to a high-gadolinium rare earth magnesium alloy rod and a preparation method thereof.
Background
With the increasing problem of energy resources, the demand for lightweight materials is also urgent. The magnesium alloy has unique advantages in the fields of automobiles, aerospace and the like as the lightest structural material in engineering application. However, magnesium alloys have limited their wide use due to their low absolute strength and poor heat resistance. The addition of rare earth elements can effectively improve the room temperature and high temperature strength of the magnesium alloy, and the development and popularization of the rare earth magnesium alloy are combined with the advantages of national resource strategy. The rare earth magnesium alloy developed in China at present is used for the industrial production of aerospace, aviation and the like.
Extrudability is an important measure of the extrusion efficiency of an alloy and refers to the maximum extrusion rate of an extruded article before the first visible crack occurs. Therefore, the development of magnesium alloy materials with high extrudability is a precondition for realizing the commercialization of magnesium alloys at present. For commercial magnesium alloy AZ31, the die exit velocity was up to 20m/min, and for AZ91 alloy the die exit velocity was also up to 4.5 m/min. The high gadolinium rare earth magnesium alloy is the magnesium alloy system with the most excellent performance at present, the mechanical property of the high gadolinium rare earth magnesium alloy is even comparable with that of partial aluminum alloy, but the high strength performance of the high gadolinium rare earth magnesium alloy is at the cost of plastic property. Due to the close-packed hexagonal structure and a large amount of rare earth, the high gadolinium rare earth magnesium alloy has high deformation processing difficulty, the deformation efficiency is far lower than that of a commercial AZ series magnesium alloy, and the requirement of modern industrial production cannot be well met.
For the moment, the developed extrusion state high gadolinium rare earth magnesium alloy is basically realized by middle and high temperature and slow extrusion. Although this method reduces the tendency of the alloy to heat crack during extrusion, it wastes a significant amount of cost at the expense of extrusion rate and production efficiency. For example, the recently developed Mg-9Gd-3Y-1.5Zn-0.8Zr alloy of Liu et al, although having an ultra-high strength (maximum strength of 446MPa), has a high sensitivity to extrusion rate, and when the ram rate is 0.32m/min, a large number of transverse cracks are generated in the surface of the extrusion. Since the existence of the low-melting phase is a root cause of the extrusion cracking, the development of a magnesium alloy having a high-melting phase is a prerequisite for forming at high-speed extrusion.
Disclosure of Invention
The invention aims to provide a high gadolinium rare earth magnesium alloy bar which has excellent mechanical properties.
The invention also aims to provide a preparation method of the high gadolinium rare earth magnesium alloy rod, compared with the method for preparing the magnesium alloy rod in the prior art, the preparation method can extrude the high gadolinium rare earth magnesium alloy rod at a higher speed, and can ensure the perfect combination of the strength and the plasticity of the high gadolinium rare earth magnesium alloy rod.
In order to achieve the purpose, the invention adopts the specific scheme that:
a high gadolinium rare earth magnesium alloy bar comprises the following components in percentage by mass: 8.0-10.0% of Gd, 1-3% of Bi, 2-4% of Y, 1-3% of Sm, 0.1-0.5% of Zr, and the balance of Mg and inevitable impurities.
A preparation method of a high gadolinium rare earth magnesium alloy bar mainly comprises the following steps:
(1) pure magnesium ingot, pure bismuth ingot, Mg-30% Gd, Mg-25% Y, Mg-30% Sm and Mg-30% Zr intermediate alloy are used as raw materials, and the raw materials are respectively heated for 0.5-1.5 h at 100-150 ℃ for drying treatment;
(2) placing the pure magnesium ingot in a preheated crucible, placing the crucible in a medium-frequency electromagnetic induction furnace filled with protective gas, heating to 730-750 ℃, and preserving heat for 5min after the pure magnesium ingot is completely melted;
(3) placing the rest raw materials except the pure magnesium ingot into a crucible in a medium-frequency electromagnetic induction furnace, heating to 760-780 ℃, continuing to preserve heat for 15-25 min after the alloy is completely melted into alloy liquid, and then cooling along with the furnace;
(4) when the temperature of the alloy liquid is reduced to 740-760 ℃, pouring the alloy liquid into a preheated casting mold to obtain a casting blank;
(5) homogenizing the cast blank obtained in the step (4) at 510-520 ℃ for 10-14 h;
(6) selecting a proper extrusion die, cutting the cast blank subjected to homogenization treatment into a size matched with a die cavity in the extrusion die to obtain a plurality of intermediate blanks, heating the intermediate blanks to 510-520 ℃ and preserving heat for 1-2 h, preheating the extrusion die to 380-420 ℃ and preserving heat for 2h, lubricating a female die and a male die of the extrusion die by using lubricating liquid, putting the heated intermediate blanks into the lubricated extrusion die on a reverse extruder for extrusion, wherein the extrusion ratio is 10-25, and the extrusion speed is 4.1 m/min; after extruding to obtain a high gadolinium rare earth magnesium alloy rod, performing water quenching treatment on the high gadolinium rare earth magnesium alloy rod by using hot water at the temperature of 80-100 ℃;
(7) and (4) carrying out aging treatment on the high gadolinium rare earth magnesium alloy rod obtained in the step (6).
Further, in the step (2), the adopted protective gas is CO2-SF6Mixed gas, CO2And SF6The gas volume ratio was 99: 1.
Further, in the step (2), the preheating temperature of the crucible is 400-450 ℃.
Further, in the step (4), the preheating temperature of the casting mold is 200-300 ℃.
Further, in the step (7), the temperature of the aging treatment is 200-250 ℃, and the time is 6-30 h.
Has the advantages that:
1. in the prior art, most rare earth magnesium alloy bars are formed by extrusion at medium-low temperature and low speed. The invention adopts a high-temperature rapid extrusion method, and realizes the great surpass of the low extrusion rate of the original high gadolinium rare earth magnesium alloy. The alloy can be formed into magnesium alloy bars by adopting a high-temperature rapid extrusion process, and is mainly attributed to the following steps: (1) the addition of Gd and Bi forms a large amount of high melting Mg5Gd and Mg3Bi2The phase (the melting point is 823 ℃) enables the alloy to have higher high-temperature stability, and further reduces the hot cracking tendency during extrusion; (2) after heating at the high temperature of 500-520 ℃, the plasticity of the intermediate blank is obviously improved, and the speed of the die extrusion opening can be effectively improved by utilizing backward extrusion. (3) The addition of a small amount of Y can promote the non-basal surface slippage of the magnesium alloy and improve the deformability. In addition, the addition of Sm can reduce the solid solubility of Gd in Mg, further promote the precipitation of a rare earth phase and further improve the high-temperature stability of the alloy; (4) the synergistic effect of the multi-element alloy elements also ensures good solid solution and aging strengthening effects, so that the high-gadolinium rare earth magnesium alloy rod can be extruded at a high rate, and meanwhile, the high-strength performance is ensured.
2. The extrusion bar prepared by the invention is a fine grain structure with a bimodal structure, and the average grain size is 3-7 mu m. The alloy with required strength and plasticity can be obtained by regulating and controlling the heat treatment time, the quantity of precipitated phases can be controlled by regulating and controlling the aging time, and a large amount of rare earth phases are precipitated by combining Gd, Y and Sm elements with Mg, so that the high-temperature high-strength performance is improved. In addition, Mg formed by the addition of Bi3Bi2The phase further improves the high-temperature stability of the alloy and the strength. The high gadolinium rare earth magnesium alloy bar prepared by the invention can still keep higher mechanical property under higher speed extrusion (4.1m/min), and compared with other preparation methods for extruding magnesium alloy bars, the high gadolinium rare earth magnesium alloy bar has the advantages that the extrusion efficiency is improved, and meanwhile, the excellent mechanical property is ensured. The high gadolinium rare earth magnesium alloy bar extruded by the invention has tensile strength,The yield strength and the elongation can reach 295MPa, 233MPa and 9.1 percent at most. The tensile strength, yield strength and elongation of the high gadolinium rare earth magnesium alloy bar subjected to aging treatment can reach 383MPa, 317MPa and 3.3% at most.
3. The extrusion bar prepared by the invention can realize the extrusion rate of 4.1m/min which is close to the extrusion limit of commercial AZ91 magnesium alloy under the condition that the extrusion ratio is not more than 25, the scheme solves the problems of low industrial production efficiency and increased production cost caused by low deformation rate of the extruded high gadolinium rare earth magnesium alloy bar, and finally the high gadolinium rare earth magnesium alloy bar has excellent mechanical property, the strength and the plasticity of the bar can be well regulated and controlled through further aging treatment, and the bar can be suitable for aerospace structural members, automobile parts and the like. The extrusion scheme and the material preparation process are simple, and the method has good industrial prospect.
Drawings
FIG. 1 is a metallographic structure diagram of an extruded rod prepared in example 1.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
A high gadolinium rare earth magnesium alloy bar comprises the following components in percentage by mass: 8.0-10.0% of Gd, 1-3% of Bi, 2-4% of Y, 1-3% of Sm, 0.1-0.5% of Zr, and the balance of Mg and inevitable impurities.
A preparation method of a high gadolinium rare earth magnesium alloy bar mainly comprises the following steps:
(1) pure magnesium ingot, pure bismuth ingot, Mg-30% Gd, Mg-25% Y, Mg-30% Sm and Mg-30% Zr intermediate alloy are used as raw materials, and the raw materials are respectively heated for 0.5-1.5 h at 100-150 ℃ for drying treatment;
(2) placing a pure magnesium ingot in a crucible preheated to 400-450 ℃, and placing the crucible in a crucible with a safety deviceHeating the magnesium ingot in a medium-frequency electromagnetic induction furnace of protective gas to 730-750 ℃, and preserving heat for 5min after the pure magnesium ingot is completely melted; wherein the adopted protective gas is CO2-SF6Mixed gas, CO2And SF6The gas volume ratio is 99: 1;
(3) placing the rest raw materials except the pure magnesium ingot into a crucible in a medium-frequency electromagnetic induction furnace, heating to 760-780 ℃, continuing to preserve heat for 15-25 min after the alloy is completely melted into alloy liquid, and then cooling along with the furnace;
(4) when the temperature of the alloy liquid is reduced to 740-760 ℃, pouring the alloy liquid into a casting mold preheated to 200-300 ℃ to obtain a casting blank;
(5) homogenizing the cast blank obtained in the step (4) at 510-520 ℃ for 10-14 h;
(6) selecting a proper extrusion die, cutting the cast blank subjected to homogenization treatment into a size matched with a die cavity in the extrusion die to obtain a plurality of intermediate blanks, heating the intermediate blanks to 510-520 ℃ and preserving heat for 1-2 h, preheating the extrusion die to 380-420 ℃ and preserving heat for 2h, then lubricating a female die and a male die of the extrusion die by using lubricating liquid (graphite and engine oil), placing the heated intermediate blanks into the lubricated extrusion die on a reverse extruder for extrusion, wherein the extrusion ratio is 10-25, and the extrusion speed is 4.1 m/min; after extruding to obtain a high gadolinium rare earth magnesium alloy rod, performing water quenching treatment on the high gadolinium rare earth magnesium alloy rod by using hot water at the temperature of 80-100 ℃;
(7) and (4) carrying out aging treatment on the high gadolinium rare earth magnesium alloy bar obtained in the step (6), wherein the temperature of the aging treatment is 200-250 ℃, and the time is 6-30 h.
The "extruded rod" and "extruded high gadolinium rare earth magnesium alloy rod" described in the present invention both represent high gadolinium rare earth magnesium alloy rods obtained through the treatment in step (6).
The technical solution of the present invention is further described below with reference to specific embodiments.
Example 1
The high gadolinium rare earth magnesium alloy rod of the embodiment comprises 9% of Gd, 3% of Bi, 2% of Y, 1% of Sm and 0.3% of Zr, and the balance of Mg and inevitable impurities.
A preparation method of a high gadolinium rare earth magnesium alloy bar mainly comprises the following steps:
(1) taking pure magnesium ingot, pure bismuth ingot, Mg-30% Gd, Mg-25% Y, Mg-30% Sm and Mg-30% Zr intermediate alloy as raw materials, respectively heating the raw materials at 100 ℃ for 40min for drying treatment;
(2) placing the pure magnesium ingot in a crucible preheated to 400 ℃, placing the crucible in a medium-frequency electromagnetic induction furnace filled with protective gas, heating to 730 ℃, and preserving heat for 5min after the pure magnesium ingot is completely melted; wherein the adopted protective gas is CO2-SF6Mixed gas, CO2And SF6The gas volume ratio is 99: 1;
(3) placing the rest raw materials except the pure magnesium ingot into a crucible in a medium-frequency electromagnetic induction furnace, heating to 780 ℃, keeping the temperature for 15min after the alloy is completely melted into alloy liquid, and then cooling along with the furnace;
(4) when the temperature of the alloy liquid is reduced to 750 ℃, pouring the alloy liquid into a casting mould preheated to 300 ℃ to obtain a casting blank;
(5) homogenizing the casting blank obtained in the step (4) at 520 ℃ for 10 hours;
(6) selecting a proper extrusion die, cutting the cast blank after homogenization treatment into a size matched with a die cavity in the extrusion die to obtain a plurality of intermediate blanks, heating the intermediate blanks to 510 ℃ and preserving heat for 2h, preheating the extrusion die to 380 ℃ and preserving heat for 2h, lubricating a female die and a male die of the extrusion die by using lubricating liquid, putting the heated intermediate blanks into the lubricated extrusion die on a reverse extruder for extrusion, wherein the extrusion ratio is 25, and the extrusion speed is 4.1 m/min; after extruding to obtain a high gadolinium rare earth magnesium alloy rod, performing water quenching treatment on the high gadolinium rare earth magnesium alloy rod by using hot water at 100 ℃;
(7) and (4) carrying out aging treatment on the high gadolinium rare earth magnesium alloy bar obtained in the step (6), wherein the temperature of the aging treatment is 225 ℃, and the time is 10 hours.
Example 2
A high gadolinium rare earth magnesium alloy bar comprises the following components in percentage by mass: 8% of Gd, 2% of Bi, 4% of Y, 1% of Sm, 0.5% of Zr, and the balance of Mg and inevitable impurities.
A preparation method of a high gadolinium rare earth magnesium alloy bar mainly comprises the following steps:
(1) pure magnesium ingot, pure bismuth ingot, Mg-30% Gd, Mg-25% Y, Mg-30% Sm, Mg-30% Zr intermediate alloy are used as raw materials, and the raw materials are respectively heated for 1h at 120 ℃ for drying treatment;
(2) placing the pure magnesium ingot in a crucible preheated to 450 ℃, placing the crucible in a medium-frequency electromagnetic induction furnace filled with protective gas, heating to 750 ℃, and preserving heat for 5min after the pure magnesium ingot is completely melted; wherein the adopted protective gas is CO2-SF6Mixed gas, CO2And SF6The gas volume ratio is 99: 1;
(3) placing the rest raw materials except the pure magnesium ingot into a crucible in a medium-frequency electromagnetic induction furnace, heating to 760 ℃, keeping the temperature for 15min after the alloy is completely melted into alloy liquid, and then cooling along with the furnace;
(4) when the temperature of the alloy liquid is reduced to 740 ℃, pouring the alloy liquid into a casting mould preheated to 250 ℃ to obtain a casting blank;
(5) homogenizing the casting blank obtained in the step (4) at 515 ℃ for 12 hours;
(6) selecting a proper extrusion die, cutting the cast blank after homogenization treatment into a size matched with a die cavity in the extrusion die to obtain a plurality of intermediate blanks, heating the intermediate blanks to 520 ℃ and preserving heat for 2h, preheating the extrusion die to 400 ℃ and preserving heat for 2h, lubricating a female die and a male die of the extrusion die by using lubricating liquid, putting the heated intermediate blanks into the lubricated extrusion die on a reverse extruder for extrusion, wherein the extrusion ratio is 15, and the extrusion speed is 4.1 m/min; after extruding to obtain a high gadolinium rare earth magnesium alloy rod, performing water quenching treatment on the high gadolinium rare earth magnesium alloy rod by using hot water at 80 ℃;
(7) and (4) carrying out aging treatment on the high gadolinium rare earth magnesium alloy bar obtained in the step (6), wherein the temperature of the aging treatment is 200 ℃, and the time is 18 h.
Example 3
A high gadolinium rare earth magnesium alloy bar comprises the following components in percentage by mass: 10% of Gd, 1% of Bi, 3% of Y, 2% of Sm, 0.3% of Zr, and the balance of Mg and inevitable impurities.
A preparation method of a high gadolinium rare earth magnesium alloy bar mainly comprises the following steps:
(1) pure magnesium ingot, pure bismuth ingot, Mg-30% Gd, Mg-25% Y, Mg-30% Sm, Mg-30% Zr intermediate alloy are used as raw materials, and the raw materials are respectively heated for 1.5h at 150 ℃ for drying treatment;
(2) placing the pure magnesium ingot in a crucible preheated to 450 ℃, placing the crucible in a medium-frequency electromagnetic induction furnace filled with protective gas, heating to 730 ℃, and preserving heat for 5min after the pure magnesium ingot is completely melted; wherein the adopted protective gas is CO2-SF6Mixed gas, CO2And SF6The gas volume ratio is 99: 1;
(3) placing the rest raw materials except the pure magnesium ingot into a crucible in a medium-frequency electromagnetic induction furnace, heating to 780 ℃, keeping the temperature for 20min after the alloy is completely melted into alloy liquid, and then cooling along with the furnace;
(4) when the temperature of the alloy liquid is reduced to 760 ℃, pouring the alloy liquid into a casting mold preheated to 200 ℃ to obtain a casting blank;
(5) homogenizing the casting blank obtained in the step (4) at 510 ℃ for 14 h;
(6) selecting a proper extrusion die, cutting the cast blank after homogenization treatment into a size matched with a die cavity in the extrusion die to obtain a plurality of intermediate blanks, heating the intermediate blanks to 510 ℃ and preserving heat for 1.5h, preheating the extrusion die to 420 ℃ and preserving heat for 2h, lubricating a female die and a male die of the extrusion die by using lubricating liquid, putting the heated intermediate blanks into the lubricated extrusion die on a reverse extruder for extrusion, wherein the extrusion ratio is 10, and the extrusion speed is 4.1 m/min; after extruding to obtain the high gadolinium rare earth magnesium alloy rod, performing water quenching treatment on the high gadolinium rare earth magnesium alloy rod by using hot water at 90 ℃;
(7) and (4) carrying out aging treatment on the high gadolinium rare earth magnesium alloy bar obtained in the step (6), wherein the temperature of the aging treatment is 225 ℃, and the time is 12 hours.
The performance tests of the extruded bar obtained in the step (6) in the examples 1 to 3 and the high gadolinium rare earth magnesium alloy bar subjected to the aging treatment in the step (7) are performed, and the results are shown in table 1.
TABLE 1 Performance test results of extruded bars and aged high gadolinium rare earth magnesium alloy bars prepared in examples 1-3
As can be seen from Table 1, the tensile strength, yield strength and elongation of the extruded bar can be as high as 295MPa, 233MPa and 9.1%. After aging treatment, the maximum tensile strength, yield strength and elongation of the high-gadolinium rare earth magnesium alloy rod can reach 383MPa, 317MPa and 3.3 percent, which proves that the high-gadolinium rare earth magnesium alloy rod prepared by the preparation method provided by the invention has excellent mechanical properties.
The foregoing is merely a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (6)
1. The high gadolinium rare earth magnesium alloy bar is characterized by comprising the following components in percentage by mass: 8.0-10.0% of Gd, 1-3% of Bi, 2-4% of Y, 1-3% of Sm, 0.1-0.5% of Zr, and the balance of Mg and inevitable impurities.
2. The preparation method of the high gadolinium rare earth magnesium alloy rod is characterized by mainly comprising the following steps:
(1) pure magnesium ingot, pure bismuth ingot, Mg-30% Gd, Mg-25% Y, Mg-30% Sm and Mg-30% Zr intermediate alloy are used as raw materials, and the raw materials are respectively heated for 0.5-1.5 h at 100-150 ℃ for drying treatment;
(2) placing the pure magnesium ingot in a preheated crucible, placing the crucible in a medium-frequency electromagnetic induction furnace filled with protective gas, heating to 730-750 ℃, and preserving heat for 5min after the pure magnesium ingot is completely melted;
(3) placing the rest raw materials except the pure magnesium ingot into a crucible in a medium-frequency electromagnetic induction furnace, heating to 760-780 ℃, continuing to preserve heat for 15-25 min after the alloy is completely melted into alloy liquid, and then cooling along with the furnace;
(4) when the temperature of the alloy liquid is reduced to 740-760 ℃, pouring the alloy liquid into a preheated casting mold to obtain a casting blank;
(5) homogenizing the cast blank obtained in the step (4) at 510-520 ℃ for 10-14 h;
(6) selecting a proper extrusion die, cutting the cast blank subjected to homogenization treatment into a size matched with a die cavity in the extrusion die to obtain a plurality of intermediate blanks, heating the intermediate blanks to 510-520 ℃ and preserving heat for 1-2 h, preheating the extrusion die to 380-420 ℃ and preserving heat for 2h, lubricating a female die and a male die of the extrusion die by using lubricating liquid, putting the heated intermediate blanks into the lubricated extrusion die on a reverse extruder for extrusion, wherein the extrusion ratio is 10-25, and the extrusion speed is 4.1 m/min; after extruding to obtain a high gadolinium rare earth magnesium alloy rod, performing water quenching treatment on the high gadolinium rare earth magnesium alloy rod by using hot water at the temperature of 80-100 ℃;
(7) and (4) carrying out aging treatment on the high gadolinium rare earth magnesium alloy rod obtained in the step (6).
3. The preparation method of the high gadolinium rare earth magnesium alloy bar according to claim 2, characterized in that: in the step (2), the adopted protective gas is CO2-SF6Mixed gas, CO2And SF6The gas volume ratio was 99: 1.
4. The preparation method of the high gadolinium rare earth magnesium alloy bar according to claim 2, characterized in that: in the step (2), the preheating temperature of the crucible is 400-450 ℃.
5. The preparation method of the high gadolinium rare earth magnesium alloy bar according to claim 2, characterized in that: in the step (4), the preheating temperature of the casting mold is 200-300 ℃.
6. The preparation method of the high gadolinium rare earth magnesium alloy bar according to claim 2, characterized in that: in the step (7), the temperature of the aging treatment is 200-250 ℃, and the time is 6-30 h.
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| CN115044811A (en) * | 2022-05-25 | 2022-09-13 | 鹤壁海镁科技有限公司 | Magnesium alloy with superplasticity performance and preparation method thereof |
| CN115233010A (en) * | 2022-06-24 | 2022-10-25 | 重庆大学 | Method for efficiently preparing high-strength magnesium alloy |
| CN116099031A (en) * | 2023-01-19 | 2023-05-12 | 北京科技大学 | Degradable and absorbable magnesium alloy suture line and preparation method and application thereof |
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