CN112481533A - Biomedical magnesium alloy and preparation method thereof - Google Patents
Biomedical magnesium alloy and preparation method thereof Download PDFInfo
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- CN112481533A CN112481533A CN202011246464.2A CN202011246464A CN112481533A CN 112481533 A CN112481533 A CN 112481533A CN 202011246464 A CN202011246464 A CN 202011246464A CN 112481533 A CN112481533 A CN 112481533A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- 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
Abstract
The invention discloses a biomedical magnesium alloy and a preparation method thereof. The biomedical magnesium alloy comprises the following components in percentage by weight: 1.0-2.0 wt% of zinc; 0.2 to 0.4 weight percent of calcium; 2.0-4.0 wt% of lithium; the balance being magnesium. Preparation: (1) preparing a magnesium alloy blank: weighing magnesium, zinc, calcium and lithium metal particles according to the component proportion of the biomedical magnesium alloy, smelting and cooling to obtain a magnesium alloy blank; (2) homogenizing: homogenizing the magnesium alloy blank at high temperature, and cooling; (3) and (3) carrying out multi-pass lap joint friction stir processing: processing the magnesium alloy blank after homogenization treatment into a magnesium alloy plate, and carrying out multi-pass lapping, stirring and friction processing on the magnesium alloy plate, wherein in the processing process, the length of a stirring pin is 6-12 mm, the diameter of a shaft shoulder of the stirring pin is 12-24 mm, the processing length of each pass is 80-120mm, and the lapping rate among the passes is 40-60%; and removing the peripheral unprocessed area after the processing is finished to obtain the biomedical magnesium alloy. The preparation method is simple, and the prepared biomedical magnesium alloy has good mechanical property.
Description
Technical Field
The invention relates to the technical field of metal materials, in particular to a biomedical magnesium alloy and a preparation method thereof.
Background
The traditional magnesium alloy has different phases, impurities and defects, even if the element contents of different parts in the same phase are different, the surface of the magnesium alloy is difficult to achieve electrochemical uniformity, local corrosion is easy to occur, and uncontrollable failure of the biological magnesium alloy occurs in the service process.
Refining the microstructure of magnesium alloys is one of the effective measures to reduce the occurrence of local corrosion. By inducing recrystallization in the deformation process, the plastic deformation can cause obvious grain refinement, and simultaneously eliminate the defects of component segregation, air hole inclusion and the like in the cast alloy, thereby effectively improving the corrosion resistance of the magnesium alloy. The severe plastic deformation technology is a grain refining method which is widely concerned, can realize excellent grain refining effect, and develops various severe plastic deformation methods such as equal channel angular extrusion, high-pressure torsion, accumulative pack rolling, multidirectional forging and the like in succession in recent years, thereby showing great potential in the aspect of improving the corrosion resistance of the biological magnesium alloy. The friction stir processing technology is a severe plastic deformation technology developed on the basis of friction stir welding technology, and the technology utilizes severe plastic deformation, mixing, crushing and heat exposure of a material in a processing area caused by high-speed stirring of a stirring head of the friction stir welding to realize densification, homogenization and grain refinement of a microstructure of the material. Compared with other severe plastic deformation technologies, the friction stir processing technology has unique advantages of no need of heating the workpiece, no change of the shape and the size of the workpiece and no limitation of processing environment. The technology has strong adaptability in magnesium alloy due to the strong plastic deformation capability. The method for processing the fine-grain biological magnesium alloy by stirring friction is put into practical application, has certain requirements on the volume of the prepared fine-grain biological magnesium alloy, and the preparation of massive fine-grain metal materials is always a difficult problem in the technical field of severe plastic deformation. The multi-pass lapping friction stir processing technology can prepare a large block of fine-grained metal material by keeping a certain lapping rate among all pass processing areas and overlapping action areas of multiple passes, and the method is preliminarily applied to aluminum alloy and magnesium alloy. Therefore, by adopting a multi-channel lapping, stirring and rubbing processing technology, massive fine-grained biological magnesium alloy with good performance is expected to be obtained.
Different biomedical magnesium alloy application occasions have different requirements on the corrosion resistance of the magnesium alloy, and how to realize effective regulation and control of the corrosion resistance of the biomedical magnesium alloy by regulating and controlling alloy components is also a difficult problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a biomedical magnesium alloy and a preparation method thereof, the preparation of the biomedical magnesium alloy is realized by adopting the steps of smelting to prepare a magnesium alloy blank, homogenizing treatment, multi-channel lapping, stirring, rubbing and processing and the like, and the biomedical magnesium alloy prepared by the method has good mechanical property and can effectively regulate and control the corrosion resistance of the magnesium alloy through magnesium alloy components.
The invention is realized by the following technical scheme:
the biomedical magnesium alloy is characterized by comprising the following components in percentage by weight: 1.0-2.0 wt% of zinc; 0.2 to 0.4 weight percent of calcium; 2.0-4.0 wt% of lithium; the balance being magnesium. According to the biomedical magnesium alloy, the lithium element is added on the basis of the traditional magnesium-zinc-calcium biological magnesium alloy, and the corrosion resistance of the biological magnesium alloy can be adjusted by changing the content of the lithium element because the chemical property of the lithium element is relatively active; according to the invention, the lithium element is added on the basis of the traditional magnesium-zinc-calcium biological magnesium alloy, so that the plastic deformation capacity of the magnesium alloy can be improved, and the requirement of severe plastic deformation in the friction stir processing process can be met.
Furthermore, the purity of the metal zinc, calcium, lithium and magnesium is not less than 99.9%.
A preparation method of biomedical magnesium alloy comprises the following steps:
(1) preparing a magnesium alloy blank: weighing magnesium, zinc, calcium and lithium metal particles with the purity of not less than 99.9 percent according to the component proportion of the biomedical magnesium alloy, smelting the metal particles in an inert atmosphere, and cooling to obtain a magnesium alloy blank;
(2) homogenizing: homogenizing the magnesium alloy blank at high temperature in an inert atmosphere, and then cooling;
(3) and (3) carrying out multi-pass lap joint friction stir processing: processing the magnesium alloy blank after homogenization treatment into a magnesium alloy plate, and performing multi-pass lapping friction stir processing on the magnesium alloy plate in a friction stir welding mode, wherein in the multi-pass lapping friction stir processing process, the length of a stirring pin is 6-12 mm, the diameter of a shaft shoulder of the stirring pin is 12-24 mm, the processing length of each pass is 80-120mm, and the lapping rate among the passes is 40-60%; and removing the peripheral unprocessed area after the processing is finished, thus obtaining the biomedical magnesium alloy.
Further, the step (1) of preparing the magnesium alloy blank: accurately weighing magnesium, zinc, calcium and lithium metal particles with the purity of not less than 99.9 percent according to the component proportion of the biomedical magnesium alloy, then placing the magnesium, zinc, calcium and lithium metal particles in a vacuum induction smelting furnace to be smelted for 0.4-0.6 h at the temperature of 680-720 ℃, and naturally cooling the smelted particles to room temperature along with the furnace after smelting is finished to obtain the magnesium alloy blank.
Further, the step (2) of homogenization treatment: placing the obtained magnesium alloy blank in a high-temperature resistance furnace, carrying out homogenization treatment under the protection of argon, and then carrying out water quenching and cooling; the temperature of the homogenization treatment is 600-630 ℃, and the time of the homogenization treatment is 12-24 hours. The biomedical magnesium alloy avoids the formation of a low-melting-point second phase in the design, so that the alloy can be homogenized at the temperature of 600-630 ℃, and alloying elements can be uniformly distributed in the magnesium alloy to the greatest extent.
Further, the step (3) is a plurality of times of lap joint friction stir processing: processing the homogenized magnesium alloy blank into a magnesium alloy plate with the thickness of 6-12 mm, and then carrying out multiple-pass lap joint friction stir processing on the magnesium alloy plate by adopting a friction stir welding machine; in the multi-pass lapping friction stir processing process, the length of the stirring pin is 6-12 mm, the diameter of the shaft shoulder of the stirring pin is 12-24 mm, the rotating speed of the stirring pin is 800-; the processing length of each pass is 80-120mm, and the lap joint rate between passes is 40-60%; in the multi-pass lapping, stirring and rubbing processing process, ice water is sprayed on the surface of the magnesium alloy plate to promote the cooling of the magnesium alloy plate; and removing the peripheral unprocessed area after the processing is finished, thus obtaining the biomedical magnesium alloy. The invention adopts a multi-channel lapping friction stir processing technology, overcomes the limitation that the traditional friction stir processing technology is difficult to prepare bulk fine-grained materials, and realizes the preparation of bulk fine-grained biomedical magnesium alloy plates.
The invention has the beneficial effects that:
(1) the biomedical magnesium alloy of the invention is added with lithium element on the basis of the traditional magnesium-zinc-calcium biological magnesium alloy, and the corrosion resistance of the biological magnesium alloy can be adjusted by changing the content of the lithium element because the chemical property of the lithium element is more active; according to the invention, the lithium element is added on the basis of the traditional magnesium-zinc-calcium biological magnesium alloy, so that the plastic deformation capacity of the magnesium alloy can be improved, and the requirement of severe plastic deformation in the friction stir processing process can be met.
(2) The biomedical magnesium alloy avoids the formation of a low-melting-point second phase in the design, so that the alloy can be homogenized at the temperature of 600-630 ℃, and alloying elements can be uniformly distributed in the magnesium alloy to the greatest extent.
(3) The preparation method of the biomedical magnesium alloy is simple, adopts a plurality of overlapping friction stir processing technologies, overcomes the limitation that the traditional friction stir processing technology is difficult to prepare bulk fine-grained materials, and realizes the preparation of bulk fine-grained biomedical magnesium alloy plates.
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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The biomedical magnesium alloy is characterized by comprising the following components in percentage by weight: 1.0 wt% of zinc; 0.2 wt% of calcium; 2.0 wt% of lithium; the balance being magnesium; the purities of the metal zinc, calcium, lithium and magnesium are all 99.9%.
The preparation method of the biomedical magnesium alloy comprises the following steps:
(1) preparing a magnesium alloy blank: accurately weighing magnesium, zinc, calcium and lithium metal particles with the purity of 99.9 percent according to the component proportion of the biomedical magnesium alloy, then mixing the metal particles in an argon atmosphere, putting the mixture into a vacuum induction smelting furnace, smelting at 680 ℃ for 0.6 hour, and naturally cooling the mixture to room temperature along with the furnace after smelting is finished to obtain a magnesium alloy blank;
(2) homogenizing: and (2) placing the obtained magnesium alloy blank into a high-temperature resistance furnace, and carrying out homogenization treatment under the protection of argon, wherein: the temperature of the homogenization treatment is 630 ℃, the time of the homogenization treatment is 12 hours, and water quenching and cooling are carried out after the homogenization treatment is finished;
(3) and (3) carrying out multi-pass lap joint friction stir processing: processing the homogenized magnesium alloy blank into a magnesium alloy plate with the thickness of 6 mm, and performing multi-pass lapping friction stir processing on the magnesium alloy plate by adopting a friction stir welding machine; in the multi-pass lapping friction stir processing process, the length of the used stirring pin is 6 mm, the diameter of the shaft shoulder of the stirring pin is 12 mm, the processing length of each pass is 80 mm, the rotating speed of the stirring pin is 800 r/min, the feeding speed of the stirring pin is 40 mm/min, and the lapping rate among the passes is 40%; in the multi-pass lapping, stirring and rubbing processing process, ice water is sprayed on the surface of the magnesium alloy plate to promote the rapid cooling of the magnesium alloy plate; and removing the peripheral unprocessed area after the processing is finished, thus obtaining the biomedical magnesium alloy.
The tensile strength of the biomedical magnesium alloy prepared in the example 1 is 269MPa according to GB/T228-2010 metallic Material tensile test. The Corrosion performance test was carried out according to ASTMG31-1972(2004) Standard Practice for Lab Immersion Testing of Metals, the Corrosion medium was a simulated body fluid, the temperature was maintained at 36.5 + -0.5 deg.C, the simulated body fluid was replaced every 24 hours, and the Corrosion rate of the biomedical magnesium alloy was measured to be 0.24 mm/year.
Example 2
The biomedical magnesium alloy is characterized by comprising the following components in percentage by weight: 1.5 wt% of zinc; 0.3 wt% of calcium; 3.0 wt% of lithium; the balance being magnesium; the purities of the metal zinc, calcium, lithium and magnesium are all 99.9%.
The preparation method of the biomedical magnesium alloy comprises the following steps:
(1) preparing a magnesium alloy blank: accurately weighing magnesium, zinc, calcium and lithium metal particles with the purity of 99.9 percent according to the component proportion of the biomedical magnesium alloy, then mixing the metal particles in an argon atmosphere, putting the mixture into a vacuum induction smelting furnace, smelting for 0.5 hour at 700 ℃, and naturally cooling the mixture to room temperature along with the furnace after smelting is finished to obtain a magnesium alloy blank;
(2) homogenizing: and (2) placing the obtained magnesium alloy blank into a high-temperature resistance furnace, and carrying out homogenization treatment under the protection of argon, wherein: the temperature of the homogenization treatment is 615 ℃, the time of the homogenization treatment is 18 hours, and water quenching and cooling are carried out after the homogenization treatment is finished;
(3) and (3) carrying out multi-pass lap joint friction stir processing: processing the homogenized magnesium alloy blank into a magnesium alloy plate with the thickness of 8 mm, and performing multi-pass lapping friction stir processing on the magnesium alloy plate by using a friction stir welding machine; in the multi-pass lapping friction stir processing process, the length of the used stirring pin is 8 mm, the diameter of the shaft shoulder of the stirring pin is 16 mm, the processing length of each pass is 100 mm, the rotating speed of the stirring pin is 1200 r/min, the feeding speed of the stirring pin is 60 mm/min, and the lapping rate among the passes is 50%; in the multi-pass lapping, stirring and rubbing processing process, ice water is sprayed on the surface of the magnesium alloy plate to promote the rapid cooling of the magnesium alloy plate; and removing the peripheral unprocessed area after the processing is finished, thus obtaining the biomedical magnesium alloy.
The tensile strength of the biomedical magnesium alloy prepared in the above example 2 was measured to be 281MPa according to GB/T228-2010 metallic Material tensile test. The Corrosion performance test was carried out according to ASTMG31-1972(2004) Standard Practice for Lab Immersion Testing of Metals, the Corrosion medium was a simulated body fluid, the temperature was maintained at 36.5 + -0.5 deg.C, the simulated body fluid was replaced every 24 hours, and the Corrosion rate of the biomedical magnesium alloy was measured to be 0.27 mm/year.
Example 3
The biomedical magnesium alloy is characterized by comprising the following components in percentage by weight: 2.0 wt% of zinc; 0.4 wt% of calcium; 4.0 wt% of lithium; the balance being magnesium; the purities of the metal zinc, calcium, lithium and magnesium are all 99.9%.
The preparation method of the biomedical magnesium alloy comprises the following steps:
(1) preparing a magnesium alloy blank: accurately weighing magnesium, zinc, calcium and lithium metal particles with the purity of 99.9 percent according to the component proportion of the biomedical magnesium alloy, then mixing the metal particles in an argon atmosphere, putting the mixture into a vacuum induction smelting furnace, smelting for 0.4 hour at 720 ℃, and naturally cooling the mixture to room temperature along with the furnace after smelting is finished to obtain a magnesium alloy blank;
(2) homogenizing: and (2) placing the obtained magnesium alloy blank into a high-temperature resistance furnace, and carrying out homogenization treatment under the protection of argon, wherein: the temperature of the homogenization treatment is 600 ℃, the time of the homogenization treatment is 24 hours, and water quenching and cooling are carried out after the homogenization treatment is finished;
(3) and (3) carrying out multi-pass lap joint friction stir processing: processing the homogenized magnesium alloy blank into a magnesium alloy plate with the thickness of 12 mm, and performing multi-pass lapping friction stir processing on the magnesium alloy plate by using a friction stir welding machine; in the multi-pass lapping friction stir processing process, the length of the used stirring pin is 12 mm, the diameter of the shaft shoulder of the stirring pin is 24mm, the processing length of each pass is 120mm, the rotating speed of the stirring pin is 1600 revolutions per minute, the feeding speed of the stirring pin is 80 mm per minute, and the lapping rate among the passes is 60%; in the multi-pass lapping, stirring and rubbing processing process, ice water is sprayed on the surface of the magnesium alloy plate to promote the rapid cooling of the magnesium alloy plate; and removing the peripheral unprocessed area after the processing is finished, thus obtaining the biomedical magnesium alloy.
The tensile strength of the biomedical magnesium alloy prepared in the example 3 is 284MPa according to GB/T228-2010 metal material tensile test. The Corrosion performance test was carried out according to ASTMG31-1972(2004) Standard Practice for Lab Immersion Testing of Metals, the Corrosion medium was a simulated body fluid, the temperature was maintained at 36.5 + -0.5 deg.C, the simulated body fluid was replaced every 24 hours, and the Corrosion rate of the biomedical magnesium alloy was measured to be 0.31 mm/year.
The above-mentioned preferred embodiments of the present invention are provided for illustration only and not for the purpose of limiting the invention. Obvious variations or modifications of the present invention are within the scope of the present invention.
Claims (6)
1. The biomedical magnesium alloy is characterized by comprising the following components in percentage by weight: 1.0-2.0 wt% of zinc; 0.2 to 0.4 weight percent of calcium; 2.0-4.0 wt% of lithium; the balance being magnesium.
2. The magnesium alloy as claimed in claim 1, wherein the purity of said metals zinc, calcium, lithium and magnesium is no less than 99.9%.
3. The method for preparing the biomedical magnesium alloy according to any one of claims 1 to 2, wherein the method comprises the following steps:
(1) preparing a magnesium alloy blank: weighing magnesium, zinc, calcium and lithium metal particles with the purity of not less than 99.9 percent according to the component proportion of the biomedical magnesium alloy, smelting the metal particles in an inert atmosphere, and cooling to obtain a magnesium alloy blank;
(2) homogenizing: homogenizing the magnesium alloy blank at high temperature in an inert atmosphere, and then cooling;
(3) and (3) carrying out multi-pass lap joint friction stir processing: processing the magnesium alloy blank after homogenization treatment into a magnesium alloy plate, and performing multi-pass lapping friction stir processing on the magnesium alloy plate in a friction stir welding mode, wherein in the multi-pass lapping friction stir processing process, the length of a stirring pin is 6-12 mm, the diameter of a shaft shoulder of the stirring pin is 12-24 mm, the processing length of each pass is 80-120mm, and the lapping rate among the passes is 40-60%; and removing the peripheral unprocessed area after the processing is finished, thus obtaining the biomedical magnesium alloy.
4. The preparation method of the biomedical magnesium alloy as claimed in claim 3, wherein the step (1) of preparing the magnesium alloy blank comprises the following steps: accurately weighing magnesium, zinc, calcium and lithium metal particles with the purity of not less than 99.9 percent according to the component proportion of the biomedical magnesium alloy, then placing the magnesium, zinc, calcium and lithium metal particles in a vacuum induction smelting furnace to be smelted for 0.4-0.6 h at the temperature of 680-720 ℃, and naturally cooling the smelted particles to room temperature along with the furnace after smelting is finished to obtain the magnesium alloy blank.
5. The method for preparing the magnesium alloy for biomedical use according to claim 3, wherein the step (2) of homogenizing: placing the obtained magnesium alloy blank in a high-temperature resistance furnace, carrying out homogenization treatment under the protection of argon, and then carrying out water quenching and cooling; the temperature of the homogenization treatment is 600-630 ℃, and the time of the homogenization treatment is 12-24 hours.
6. The preparation method of the biomedical magnesium alloy according to claim 3, wherein the step (3) comprises multiple steps of lap-joint friction stir processing: processing the homogenized magnesium alloy blank into a magnesium alloy plate with the thickness of 6-12 mm, and then carrying out multiple-pass lap joint friction stir processing on the magnesium alloy plate by adopting a friction stir welding machine; in the multi-pass lapping friction stir processing process, the length of the stirring pin is 6-12 mm, the diameter of the shaft shoulder of the stirring pin is 12-24 mm, the rotating speed of the stirring pin is 800-; the processing length of each pass is 80-120mm, and the lap joint rate between passes is 40-60%; in the multi-pass lapping, stirring and rubbing processing process, ice water is sprayed on the surface of the magnesium alloy plate to promote the cooling of the magnesium alloy plate; and removing the peripheral unprocessed area after the processing is finished, thus obtaining the biomedical magnesium alloy.
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| CN114075629A (en) * | 2021-10-25 | 2022-02-22 | 江苏理工学院 | Degradable superfine crystal biological magnesium alloy and preparation method thereof |
| CN114086011A (en) * | 2021-10-25 | 2022-02-25 | 江苏理工学院 | Preparation method of component gradient magnesium-based implant material with controllable degradation |
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