200 results about "Mg alloys" patented technology

The utility model discloses an electromagnetic compatibility assessment device, and belongs to the technical field of wireless communication. The equipment comprises a data processing module, a signal generator module, a low-frequency / high-frequency amplifier, a combining unit, a shielding frame and a power supply module, and accurate evaluation of the electromagnetic compatibility of the weak current equipment is realized through modular design. The signal generator module adopts a multi-band vector signal generator to generate configurable interference signals; the low-frequency amplifier and the high-frequency amplifier respectively adopt independent high-precision amplification circuits; and the combining unit couples the two paths of signals into a composite interference signal and outputs the composite interference signal. The shielding frame is made of double-layer aluminum magnesium alloy and is combined with a metal machine frame to form a composite shielding system. And the data processing module regulates and controls parameters in real time through the touch screen, analyzes response data of the tested equipment based on an FFT algorithm, and generates a visual evaluation report.

The application discloses an amorphous silicon dioxide coating prepared based on micro-arc oxidation, a preparation method and application thereof, and belongs to the technical field of metal surface protection and silicon dioxide coating. In the application, a magnesium alloy, an aluminum alloy, a titanium alloy, a titanium-aluminum base and a nickel-aluminum base are used as anodes and are placed in a micro-arc oxidation tank, a hydrolytic solution of organic silicon is used as an electrolyte, and an amorphous silicon dioxide coating with a thickness of more than 100 mu m can be prepared within 20 minutes through a step-by-step step-incremental constant potential control means. The application utilizes the advantages of the micro-arc oxidation process and the sol-gel process, avoids their shortcomings, and realizes the superimposed synergistic effect of "1+1>2". The process steps of the application are simple, and the application is very suitable for full-automatic operation and processing in industry. The amorphous silicon dioxide coating with the required thickness, wear resistance, corrosion resistance, erosion resistance, oxidation resistance and other characteristics can be prepared by changing the electrolyte concentration, the micro-arc oxidation time and the electric control parameters, or through the conventional micro-arc oxidation constant voltage and constant current control means.

The invention relates to the cross technical field of material calculation and machine learning, and discloses a magnesium alloy grain boundary segregation site determination method based on a physical information graph neural network, and the method comprises the following steps: extracting initial geometric structure information of a target grain boundary site and adjacent atoms thereof, and obtaining feature vectors of initial nodes and edges; performing message passing on the initial node and the edge feature vector based on a mathematical analysis form and an update function embedded with physical information to obtain an updated node feature vector; carrying out aggregation processing on the updated node feature vectors to generate a grain boundary structure descriptor used for representing the local atomic environment of the grain boundary site; and inputting the grain boundary structure descriptor into a pre-trained machine learning regression model to obtain a solute segregation performance predicted value of the target grain boundary site. According to the method, the calculation of segregation energy is converted into efficient machine learning prediction from high-cost physical simulation, and the calculation efficiency is greatly improved.

The invention relates to an advantageous composition for its use in a glass manufacturing process, comprising (i) at least a calcium raw material and (ii) at least a calcium-magnesium raw material, with when CaO is ≥ 4*MgO in said composition, said calcium-magnesium raw material is hydrated dolime; and when CaO is < 4*MgO in said composition, said calcium raw material is hydrated lime.

The invention discloses a preparation method of a hydrogen-responsive composite multilayer magnesium-based film surface self-wrinkle pattern. The preparation method comprises the following steps: A, preparing a polymer elastic layer on the surface of a supporting substrate; b, depositing a plurality of layers of metal-based films on the polymer elastic layer by adopting a magnetron sputtering method; and C, exposing the prepared sample in a hydrogen-containing atmosphere, and forming a wrinkle pattern of which the recognizable size is in a range of 10nm-1000mu m on the surface through hydrogenation reaction at normal temperature. According to the method, the surface of the thin film can be deformed by exposing the thin film to the hydrogen-containing atmosphere environment, so that the three-dimensional wrinkle texture can be quickly realized, and the three-dimensional wrinkle morphology can be accurately regulated and controlled by adjusting the element components, sputtering time, sputtering power, working gas flow and hydrogen treatment parameters of the magnesium or magnesium alloy hydrogen-sensitive reaction film layer. The pattern features of the prepared wrinkle pattern can be recognized through characterization means such as an optical microscope, a scanning electron microscope, an atomic force microscope or a diffraction light-variable device.

This invention provides a magnesium anode material with a dislocation density gradient structure based on asynchronous rolling, its preparation method, and its application, relating to the field of anode material technology. The magnesium anode material of this invention is prepared by raw material melting and casting, solution treatment, extrusion molding, and asynchronous rolling. The magnesium anode material includes no more than 0.1 wt.% zirconium, with the balance being magnesium and unavoidable impurities. The dislocation density of the magnesium anode material increases gradient from the surface to the core. This invention introduces a dislocation density structure with a gradient from the surface to the core into magnesium alloy sheets through asynchronous rolling, thereby obtaining a magnesium anode material with both high discharge activity and good corrosion resistance, improving its overall discharge performance in magnesium-air batteries. The preparation process of the magnesium anode material of this invention is simple, highly controllable, and easy to scale up, possessing good industrialization potential.

This invention provides a micro-arc oxidation electrolyte for magnesium alloy surface treatment and a method for preparing a micro-arc oxidation film. The micro-arc oxidation electrolyte is an aqueous solution containing sodium silicate, sodium hydroxide, potassium fluoride, and titanium boron carbon nitride conductive nanoparticles; or, an aqueous solution containing sodium silicate, potassium hydroxide, potassium fluoride, and titanium boron carbon nitride conductive nanoparticles. This invention also discloses a method for preparing a micro-arc oxidation film using the aforementioned micro-arc oxidation electrolyte for magnesium alloy surface treatment. The micro-arc oxidation electrolyte of this invention contains conductive ceramic nanoparticles—titanium boron carbon nitride conductive nanoparticles. Using these nanoparticles to perform a micro-arc oxidation reaction on the magnesium alloy surface can improve the microstructure of the micro-arc oxidation film, while simultaneously enhancing the corrosion resistance and wear resistance of the magnesium alloy after micro-arc oxidation treatment, significantly improving the surface protection capability of the magnesium alloy, and extending its service life.

The utility model relates to a large area contact type thread type degradable magnesium alloy aortic blood vessel anastomat, including the conical inner ring, conical outer ring and sleeve outer ring that set gradually from inside to outside, be provided with blood vessel clamping space between the conical inner ring and conical outer ring, it is the thread cooperation between conical outer ring and sleeve outer ring, adjust the size of blood vessel clamping space through the rotation sleeve outer ring, sleeve outer ring. The utility model simple structure, reasonable in design, convenient to use, adjust the size of blood vessel clamping space through the rotation conical outer ring and sleeve outer ring to fixed blood vessel, realize blood vessel anastomosis fast, avoid the mode of the traditional everted type through end face combination simultaneously, greatly increase the contact area between blood vessel and prevent the occurrence of blood leakage.

The application relates to the technical field of metal surface protection materials, in particular to a magnesium alloy surface protection material, a preparation method and application thereof, which contains 40-60 parts of a fluorocarbon resin matrix, 30-50 parts of functional fillers, 5-10 parts of corrosion inhibitors, 3-8 parts of cross-linking agents, 0.5-2 parts of catalysts and 1-3 parts of additives; the functional fillers are modified to form a 'core-shell' structure, graphene is loaded with nano zinc oxide, and fluorophosphoric calcium whiskers are coated with rare earth cerium salt; the preparation process comprises resin interpenetrating network formation, filler pretreatment, pre-crosslinking, catalytic crosslinking and grinding; the material forms a three-dimensional protection system, the hardness is greater than or equal to 3H, the adhesion is less than or equal to 1 grade, the salt mist resistance is greater than or equal to 1000h, the self-repairing efficiency is greater than or equal to 90%, and the high-low temperature cycle resistance is excellent. The application has comprehensive protection performance, synergistic effects of physical shielding, chemical corrosion inhibition and self-repairing, good adhesion and weather resistance, strong high-low temperature resistance and corrosion resistance, and stable process, and can provide reliable and long-acting protection for magnesium alloys.

The invention discloses a gradient degradation type personalized absorbable sternum fracture fixing plate and a preparation process, and belongs to the technical field of medical implant materials. Comprising an anatomical adaptive plate body and an integrated locking assembly, the plate body is of a partitioned structure of a middle supporting area and an edge buffering area, a gradient pore array penetrating through the thickness direction is formed in the surface of the plate body, and a hydroxyapatite-collagen composite coating is loaded on the inner wall of a pore; the plate body is made of a composite absorbable material through 3D printing forming and hot pressing post-treatment, and the composite absorbable material comprises, by weight, 60%-70% of polylactic acid-glycolic acid copolymer (PLGA, LA / GA = 75 / 25), 15%-20% of silanized magnesium alloy microwires, 5%-10% of hydroxyapatite nano-particles and 5%-10% of polycaprolactone (PCL). Space-time matching of the degradation rate and the bone healing process is achieved through the partition gradient structure, the magnesium alloy microwires enhance the mechanical property and release active ions to promote osteogenesis, and the method has the advantages of personalized adaptation, gradient degradation, bone regeneration promotion and the like.

Composition, characterized in that: —it comprises, in a solution of demineralized water: between 10 and 80, preferably between 15 and 20, more preferably 17, g / l of a composition of phosphoric acid H3PO4, and between 2 and 15, preferably between 4 and 8, more preferably 6, g / l of a composition of potassium permanganate KMnO4, —the weight ratio H3PO4 / KMnO4 is between 1.5 and 10, preferably between 1.8 and 5, mote preferably equal to 2.8, —said composition has a pH between 2.4 and 3, preferably 2.5.

The application discloses a degradable fracture fixation device, which comprises a fixing part, a suture and a tensioning mechanism, one end of the suture is connected with the fixing part, the other end of the suture is connected with the tensioning mechanism after passing through a separation site and a bone body, and the tensioning mechanism is used for tightening the suture so as to fix the separation site on the bone body; the tensioning mechanism comprises a positioning cylinder, a tensioning part is movably arranged in the positioning cylinder, and the tensioning part is connected with the suture. The fixing part and the tensioning mechanism are both made of degradable materials, and the degradable materials are any one of magnesium or a magnesium alloy or a magnesium-based composite material, zinc or a zinc alloy or a zinc-based composite material, and iron or an iron alloy or an iron-based composite material. The fixing device has the advantages of simple structure, convenient use, simplified operation process, shortened operation time, favorable operation completion of doctors, good fixing effect on the separation site, prevention of tearing of the separation site, promotion of post-operation recovery of patients and the like.

This invention belongs to the field of metallurgical technology and relates to a method for preparing crude cadmium from cadmium-containing flue dust, comprising the following steps: S1, neutral leaching of cadmium-containing flue dust with deionized water to obtain filter residue and filtrate 1; then acid leaching of the filter residue with sulfuric acid to obtain lead slag and filtrate 2; S2, mixing filtrate 1 and filtrate 2, adding an oxidant and iron salt for primary purification to obtain arsenic-antimony slag and filtrate 3; adding zinc powder twice to filtrate 3 for secondary purification to obtain copper-nickel slag and filtrate 4; S3, concentrating filtrate 4 to obtain cadmium-rich solution, then aging at 70-85℃; subsequently cooling to 50-65℃, adding polyethylene glycol, and adding aluminum-magnesium alloy powder under high-speed stirring for a displacement reaction; after the reaction, obtaining filtrate and crude cadmium. This invention deeply removes impurities such as arsenic, antimony, and lead from cadmium-containing flue dust and obtains high-purity, dense crude cadmium particles with the aid of morphology modifiers, high-speed stirring, and aluminum-magnesium alloy powder.

The invention discloses a titanium-magnesium nail plate system capable of promoting fracture healing and a manufacturing and forming method. The manufacturing and forming method comprises the steps that a bone fracture plate digital model containing a bone trabecula simulation porous area and a partition filling cavity is established according to a bone anatomical structure, and a titanium-based workpiece of a porous structure is manufactured through selective laser melting forming; a titanium-zinc-calcium component gradient transition layer is constructed layer by layer on the surface of the porous inner wall of the titanium-based workpiece through a directional deposition process, interface bonding is strengthened through low-temperature heat treatment, and the titanium-based workpiece with a gradient interface is obtained; the titanium-based workpiece with the gradient interface is placed in an inert atmosphere, after heating is conducted, molten magnesium or magnesium alloy is injected into all the cavities through a partitioned vacuum pressure injection technology, and after cooling is conducted, a titanium-magnesium composite workpiece is formed; through a customized and interface-controllable manufacturing method, a high-strength titanium skeleton and a degradable healing-promoting magnesium material are firmly combined, and integrated design and manufacturing of mechanical support and biological activity of the internal fixation device are achieved.

This invention discloses a method for preparing a Schiff base corrosion inhibitor for AZ91D magnesium alloy coolant. The method involves adding an ethanol or acetone solution of the ketone-containing heterocyclic compound dropwise to an aqueous solution of the alkaline amino acid at a molar ratio of 1:1 to 1.5. The reaction is carried out at 40–80°C for 4–36 hours, followed by concentration, extraction with glacial ethyl acetate, washing with glacial ethyl acetate, and drying to obtain the corrosion inhibitor. Further, the corrosion inhibitor is formulated into a coolant specifically for AZ91D magnesium alloy. This coolant is composed of a mixture of raw materials with the following weight percentages: 0.1–2% corrosion inhibitor, 39–60% deionized water, and 39–60% ethylene glycol. This invention features a simple preparation process, and the obtained corrosion inhibitor can be stored for a long time, exhibits good thermal stability, strong oxidation resistance, low conductivity, high corrosion inhibition efficiency, and good corrosion inhibition effect on AZ91D magnesium alloy.

The application provides a medical biological magnesium alloy material containing trace light rare earth elements, which comprises: Nd 1.0-5.0%, Ag 0.5-1.8%, Pr 0.15-0.65%, Pm 0.15-0.65%, and the balance is Mg. The application also provides a preparation method of the medical biological rare earth magnesium alloy material and application thereof. The medical biological rare earth magnesium alloy material provided by the application has excellent mechanical properties, uniform degradation performance and processing performance by adding appropriate alloying elements Nd, Ag, Pm and Pr which meet a certain relationship formula and using a specific preparation method, and can meet the requirements of being used as a medical implant material and being processed into related medical devices; the medical biological rare earth magnesium alloy material has excellent biological safety and biocompatibility, and also has the biological functions of inhibiting and killing bacteria, resisting inflammation and resisting infection, and can also activate cells, promote tissue repair and wound healing.

The utility model relates to the technical field of vacuum melting, in particular to a protection device for magnesium alloy vacuum melting, which comprises a two-stage rotary vane vacuum pump, a roots vacuum pump, a low-vacuum electromagnetic pressure difference inflation valve, a vacuum stop valve, a vacuum pipeline, a pressure air storage tank and a vacuum ball valve. A low-vacuum electromagnetic pressure difference inflation valve is connected between the two-stage rotary vane vacuum pump and the roots vacuum pump, a vacuum stop valve is connected above the roots vacuum pump, the top of the vacuum stop valve is connected with a vacuum pipeline, the right side of the vacuum pipeline is connected with a pressure air storage tank, and the right side of the pressure air storage tank is connected with a vacuum ball valve. And meanwhile, high-temperature magnesium liquid or gas is prevented from entering the two-stage rotary vane vacuum pump and the roots vacuum pump, so that the overall safety of the device is improved.

The invention relates to the technical field of alloys, in particular to a magnesium alloy spraying pretreatment process. According to the process, after alkali washing and acid activation are conducted on magnesium alloy, pre-adsorption and main conversion treatment are conducted in sequence. Both the pre-adsorption liquid A and the main conversion liquid B contain polyether / zwitterionic modified colloidal silicon dioxide mother liquor, the mother liquor is obtained through amination, polyether, tertiary amination and zwitterionic modification of colloidal silicon dioxide, and the dispersion stability and interfacial compatibility of the colloidal silicon dioxide in an acidic fluorine-containing environment are remarkably improved. A uniform and compact conversion film is formed on the surface of the treated magnesium alloy, and the coating is high in binding force, high in corrosion resistance, excellent in appearance and suitable for high-end application such as 3C product shells.

A biodegradable stent is disclosed. The stent includes a tubular member formed of a plurality of interwoven filaments. The filaments comprise a magnesium alloy, preferably a WE22 magnesium alloy. The magnesium alloy may consist essentially of 1.9-2.1 wt. % Yttrium, 1.4-1.6 wt. % Neodymium, 0.4-0.6 wt. % Zinc, and the balance Magnesium. The filaments may have an ultimate tensile strength of 60 to 80 KSI and / or an elongation at break in the range of 2% to 20%, preferably 2% to 10%.

The application provides a controllable degradation medical orthopedic magnesium-ceramic glass composite stent and a preparation method thereof. The preparation method comprises the following steps: mixing a magnesium alloy powder and a ceramic glass powder; printing a composite material stent by using a laser powder bed melting technology; and performing surface treatment on the composite material stent, and then performing high polymer coating surface treatment, so that the controllable degradation medical orthopedic magnesium-ceramic glass composite stent is obtained; wherein the magnesium alloy is a Mg-Y-Gd-Zr magnesium alloy; and the ceramic glass is selected from hydroxyapatite, beta-tricalcium phosphate, bioglass, ZrO2 and the like. The stent structure suitable for bone defect model construction is prepared by using the laser powder bed melting technology, the surface treatment technology is used for realizing the regulation and control of the mechanics and biological activity of the stent, the magnesium-ceramic glass composite stent with good hydrophilicity, controllable degradation, high strength and good bone conduction is successfully prepared, and the urgent needs of the stent material for long-term mechanical support, controllable degradation and good osteogenic induction effect of the medical orthopedic implant material can be met.

The invention discloses a magnesium-based medical material containing a CaP-CS / diamond-like carbon composite coating and a preparation method and application thereof.The magnesium-based medical material is composed of a magnesium alloy, the diamond-like carbon coating and the CaP-CS coating, the diamond-like carbon coating is attached to a magnesium alloy substrate, and the CaP-CS coating is attached to the diamond-like carbon coating. The method comprises the following steps: preparing a diamond-like coating on the surface of a magnesium alloy substrate, and soaking the diamond-like coating in a CaP-CS solution to obtain the magnesium-based medical material containing the CaP-CS / diamond-like composite coating. According to the composite coating structure, high hardness and chemical inertness of the diamond-like coating and excellent biocompatibility and osteoinductivity of the CaP-CS coating are integrated, collaborative optimization of corrosion resistance and biocompatibility of the magnesium alloy is achieved, good film-substrate binding force is achieved, and application of the magnesium alloy in the field of biomedical implant materials is promoted.

The invention relates to a preparation method of a magnesium alloy stent composite coating, and belongs to the technical field of biomedical materials. The composite coating with the piezoelectric-pH synergistic protection function is provided for solving the technical problems that an existing polyester coating is degraded to produce acid, and corrosion of a magnesium alloy stent is accelerated. The coating comprises a PVDF (Polyvinylidene Fluoride)-g-APTES ( The pH regulation and control middle layer is composed of PVDF, PDLLA and alkaline nanoparticles; and a drug-loaded PDLLA outer coating layer. The pH value of the interface is actively increased to a passivation region through on-demand release of the alkaline nanoparticles, and a positive feedback mechanism that protection is achieved when stress is increased is achieved through the piezoelectric effect. Compared with the prior art, the dynamic corrosion resistance is enhanced by 40% or above, the protection effect is improved by 60% or above through the synergistic effect, piezoelectric and alkaline synergistic protection is achieved, and a comprehensive solution with long-acting corrosion resistance and intelligent response is provided for a degradable magnesium alloy implantation instrument.

The utility model relates to a kind of 3D printing's embedded titanium-magnesium alloy bone repair body, belong to bone repair body field, solve the existing single titanium alloy bone repair body elastic modulus and human skeleton difference in prior art is larger, it is prone to stress shielding effect, and the single magnesium alloy bone repair body mechanical strength and corrosion resistance is poor.The utility model includes titanium alloy cylinder, magnesium alloy structure and inlay structure, magnesium alloy structure is connected with titanium alloy cylinder by inlay structure;Multiple evenly distributed inlay grooves are equipped along the circumference of titanium alloy cylinder, both sides of inlay groove are equipped with directional slide, magnesium alloy structure is arranged in inlay groove, both sides of magnesium alloy structure are equipped with limit protrusion, limit protrusion and directional slide sliding connection.The utility model inlay magnesium alloy structure in titanium alloy cylinder, rely on titanium alloy cylinder to provide mechanical support, magnesium alloy structure gradually degrades to promote bone growth, the defect of single material is effectively avoided by the combination of both.

A biodegradable stent is disclosed. The stent includes a tubular member formed of a plurality of interwoven filaments. The filaments comprise a magnesium alloy, preferably a WE22 magnesium alloy. The magnesium alloy may consist essentially of 1.9-2.1 wt. % Yttrium, 1.4-1.6 wt. % Neodymium, 0.4-0.6 wt. % Zinc, and the balance Magnesium. The filaments may have an ultimate tensile strength of 60 to 80 KSI and / or an elongation at break in the range of 2% to 20%, preferably 2% to 10%.

The invention relates to a kitchen fan magnesium alloy component riveting device, which belongs to the technical field of fan assembly, and comprises a machine body, a rotary worktable, a support frame, a pressing driving cylinder, a stamping rod piece, a cutting sleeve II, a liftable support base and a liftable cutting sleeve I, the cutting sleeve II and the cutting sleeve I which can be linked are arranged at the upper end and the lower end correspondingly, during riveting, the downward pressing driving air cylinder drives the cutting sleeve II and the cutting sleeve I on the rising supporting base to conduct punching, an insulating tape located between the cutting sleeve II and the cutting sleeve I is synchronously punched into an annular gasket, and then a punching rod piece continues to conduct downward pressing; according to the punching and riveting device, the annular gasket is tightly pressed between the rivet and the magnesium alloy part, integrated linkage of punching and riveting actions of the insulating gasket is achieved, direct contact between the magnesium alloy part and the rivet is effectively isolated, electrochemical corrosion is fundamentally avoided, meanwhile, the machining procedure is simplified, and the production efficiency and the riveting quality are improved.

The application relates to a method for preparing graphene by solid-liquid in-situ reaction and graphene prepared by the method. The method comprises the following steps: heating and melting magnesium or a magnesium alloy in a crucible to obtain a melt; adding solid hexachloroethane into the melt at a speed of 1 g / min to 20 g / min and performing mechanical stirring, and then standing to obtain a mixture containing graphene above the melt; the mass amount of the solid hexachloroethane is 2% to 5% of the mass of the melt; separating the obtained mixture containing graphene from the melt; and performing post-treatment on the mixture containing graphene separated from the melt to obtain graphene. The application provides a method for preparing graphene in large quantities at low cost, with high production efficiency and high quality; the method has the advantages of simple operation, simple production equipment, low production cost, high yield, high graphene quality, fewer defects and impurities, excellent product performance and the like.

The invention belongs to the technical field of metal material surface corrosion prevention, and discloses a pitting-resistant corrosion inhibitor coated GO-Al-based composite coating as well as a preparation method and application of the pitting-resistant corrosion inhibitor coated GO-Al-based composite coating. The method comprises the following steps: adding aluminum powder into a GO aqueous solution and a corrosion inhibitor aqueous solution for ultrasonic dispersion; carrying out static settlement, filtering, washing and vacuum drying to obtain modified aluminum powder, and mixing the modified aluminum powder with alumina powder to obtain mixed powder; under the pressure of 0.6-0.8 MPa, carrying out sand blasting treatment on the magnesium alloy matrix by adopting silicon carbide to enable the surface roughness of the magnesium alloy matrix to be 1-3 microns, so as to obtain a pretreated magnesium alloy matrix; and the mixed powder is sprayed on the surface of the pretreated magnesium alloy matrix, and the corrosion inhibitor coated GO-Al-based composite coating is prepared. The composite coating releases a corrosion inhibitor at the crack defect position, a hydrophobic adsorption film is generated, invasion of a corrosion medium and pitting corrosion of the Al coating can be effectively blocked through cooperation with graphene oxide, the corrosion resistance of the Al-based coating is enhanced, and the composite coating can be applied to the field of metal surface corrosion resistance.

The invention belongs to the technical field of alloys, and particularly relates to a laser additive manufacturing magnesium alloy and a preparation method and application thereof. The invention provides a magnesium alloy laser additive manufacturing method which comprises the following steps: mixing magnesium alloy powder and a high-melting-point reinforcing phase to obtain a mixed material; the melting point of the high-melting-point reinforced phase is 2800-3900 DEG C; and the mixed material is subjected to laser additive manufacturing and then subjected to heat treatment, and the magnesium alloy is obtained. Magnesium alloy powder and high-melting-point reinforcing phases are used as raw materials for laser additive manufacturing, the high-melting-point reinforcing phases are distributed in a microscopic structure or at a grain boundary of a formed alloy in the laser additive manufacturing process, and in the subsequent heat treatment process, the dispersed reinforcing phases can generate a pinning effect to hinder migration of the grain boundary and generate resistance to the grain boundary, so that the grain boundary is prevented from being damaged. Therefore, the abnormal grain coarsening behavior of the magnesium alloy in the subsequent heat treatment process is inhibited, the microscopic structure of the magnesium alloy is improved, and the mechanical property of the magnesium alloy is improved.

This invention belongs to the field of advanced metallic materials manufacturing, and relates to the design and preparation method of a high-plasticity Mg-Sn-Al magnesium alloy. First, a candidate system of Mg-xSn-yAl alloys is established. First-principles methods based on density functional theory are used to perform VCA modeling on each candidate composition and calculate elastic constants. Combined with the Voigt-Reuss-Hill model, parameters such as bulk modulus B, shear modulus G, Poisson's ratio, Pugh ratio, and Cauchy pressure are obtained. Using a Poisson's ratio greater than 0.36, a Pugh ratio greater than 3.4, and a Cauchy pressure greater than 18 GPa as screening criteria, the composition range of the high-plasticity alloy is determined to be Mg-(1-3.2)Sn-(0.7-0.8)Al (wt.%). Subsequently, alloy plates are prepared through melting and casting, hot extrusion, staged rolling, intermediate annealing, and pulsed current post-treatment, and tensile property testing and microstructure characterization are performed. The results show that the selected alloys have superior plasticity, with the Mg-3.2Sn-0.79Al alloy achieving an elongation of 15.6%. This invention enables rapid screening and preparation of high-ductility magnesium alloys, which can reduce trial-and-error costs and improve alloy design efficiency.