51 results about "Friction stir processing" patented technology

According to the metal stirring friction additive manufacturing technology and the component for controlling the precipitated phase through full-process deep cooling, in the technology, full-process deep cooling control in the aluminum alloy metal bar machining process is kept, the aluminum alloy metal bar is in a supersaturated solid solution state all the time, and therefore the precipitation phase is controlled; a temperature control system is directly applied through a stirring friction solid-phase additive stirring main shaft system, and stirring friction additive machining of metal bars is achieved under the combined action of a deep cooling temperature control environment and rotating stirring friction of a stirring friction machining head. A large number of dislocation structures introduced by strong plastic deformation in the rotary stirring friction additive machining process are combined, and the interior of an additive forming structure is rich in a large number of dislocation entanglement network structures. And a large number of precipitated phases are promoted to be uniformly precipitated in the structure, the target of controllability of the material temperature and the structure in the additive manufacturing process is achieved, the structure of the machined and formed metal 3D entity component is optimized, and the mechanical property of the metal 3D entity component is improved.

The invention discloses a dissimilar magnesium alloy composite structure and a low-cost electric arc additive manufacturing method thereof. The method comprises the following steps that 1, AZ series magnesium alloy wires and rare earth magnesium alloy wires are selected; 2, material distribution of the two kinds of wires is subjected to partition design; step 3, preheating the substrate; 4, depositing a material 1 in a single-arc and sequential wire feeding mode, and 5, depositing a material 2 in the middle: depositing the material 2 as a transition layer under a single-arc consumable electrode heat source. And step 6, interface processing. And 7, the component is preheated again, the material 2 continues to be deposited, and finally the AZ-rare earth magnesium alloy composite structure is obtained. According to the method, a single-arc, sequential wire feeding and interlayer friction stir processing cooperation strategy is adopted, the prepared composite structure has the characteristics of controllable performance, structural integration, good interface metallurgical bonding and the like, the performance limitation of a traditional single material is broken through, and the method has wide application prospects in the fields of aerospace, automobile lightweight and the like.

The invention discloses a block magnesium-based composite material capable of quantitatively regulating and controlling the content of nano-particles and a manufacturing method of the block magnesium-based composite material, and belongs to the technical field of metal-based composite material preparation. The method comprises the following steps: providing a magnesium alloy substrate and a cover plate, determining the sectional dimension of a groove of the cover plate according to the volume fraction of target nanoparticles, processing the groove, then filling the groove with the nanoparticles, assembling the cover plate on the substrate in an inverted buckling manner to form a to-be-processed assembly, performing multi-pass stirring friction processing to form a first composite material layer, and stacking the first composite material layer as a new substrate layer by layer to form a second composite material layer; and finally, the target block magnesium-based composite material is prepared. Through the correlation design of the groove size and the target volume fraction, accurate control and uniform dispersion of the nano-particle content are achieved, the problems that a traditional method is high in defect rate, limited in size and the like are solved, the strength and plasticity of the prepared material are remarkably improved, the process is green and environmentally friendly, and the method is suitable for mass production of large-size components and can be popularized to various light metal matrixes; the application prospect is wide.

The invention discloses a high-precision multi-component microalloying nickel-based alloy plate blank and a preparation method, and belongs to the technical field of high-temperature alloy materials. The nickel-based alloy plate blank is prepared from the following raw materials in percentage by mass: 16.68 to 19.76 weight percent of Cu, 0.84 to 1.57 weight percent of Pr, 0.76 to 1.64 weight percent of Se and the balance of Ni. The raw materials comprise Pr and Se, the rare earth element Pr is added, so that the grain boundary can be purified, the purity of the obtained nickel-based alloy material is improved, and a certain grain refining effect is achieved; se can form selenide, the self-lubricating effect is achieved in the subsequent machining process, and the defects caused by friction are reduced. And in the preparation process, a processing mode of combining double-sided friction stir processing and vacuum diffusion welding is adopted, so that the surface defects of the sintered plate are effectively eliminated, the thickness direction is kept highly continuous in the vacuum diffusion welding process, and the nickel-based alloy material with excellent mechanical properties is obtained.

This invention discloses a multi-mode processing method for friction stir deposition modeling driven by cascaded electric spindles. Based on a cascaded electric spindle-driven friction stir deposition modeling die head, the die head includes a screw shaft, a first electric spindle, and a second electric spindle that drives the screw shaft to rotate; a material conveying assembly including a storage box cover and a storage cavity formed by a specific inlet and a specific first outlet; and a stirring extrusion tool, wherein the first electric spindle includes a first hollow mandrel. This invention employs a compact coaxial cascaded electric spindle design, integrating the force transmission, heat transfer, and material transfer functions of the innovative hollow electric spindle into one unit, exhibiting modular characteristics. This overcomes the current additive manufacturing process where granular materials cannot be processed using a stirring tool in a coaxial friction stir process. Based on a circumferentially distributed multi-material conveying assembly design within the electric spindle assembly, this invention features material openness, enabling friction stir deposition modeling of multiple materials or gradient materials.

The present application relates to a kind of metal matrix composite prepared by friction stir processing method, including the mixing of metal matrix composite reinforcement and substrate powder, according to the size of stir pin and shaft shoulder in the stir head of friction stir equipment, using milling cutter to open the groove on pure metal mold, the width is greater than the diameter of stir pin, the depth is greater than the length of stir pin;Reinforcement and substrate powder mixture is added to the groove and is maximized compaction, in the processing area of special friction stir welding machine, the center of stir pin of stir head is aligned with the center of groove, is prepared under the processing scheme of multiple passes variable stir head speed, obtains metal matrix composite at the groove of composite plate processing area, the obtained metal matrix composite reinforcement is uniformly distributed, and the mechanical and friction and wear performance is excellent.The present application can automatically prepare a variety of different kinds of metal matrix composite, without determining specific process parameters for different kinds of metal and reinforcement test, and is widely applicable.

A method of processing high-strength steel includes providing a first piece of high-strength steel. Friction stir processing the first piece of high strength steel is performed by pre-heating an area in advance of a friction stir welding tool and moving the friction stir welding tool between 500 mm and 300 mm per minute to attain a mixed zone having a mixed zone temperature at the mixed zone between a eutectoid temperature and a forge welding temperature from a combination of the friction from the friction welding tool and the step of pre-heating.

The present application belongs to the technical field of polymer surface metallization, and particularly relates to a preparation method of polymer surface metallization coating based on cold gas dynamic spraying and friction stir processing. The method comprises the following steps: (1) using a cold gas dynamic spraying device, spraying metal powder (such as Al, Cu, Ti, Ag, Sn, etc.) to the surface of a polymer substrate (such as PEEK, PEI, PA6, ABS and their composite materials, etc.) under certain conditions to form a cold sprayed metal coating; (2) using a friction stir welding center to perform friction stir processing on the deposited cold sprayed coating and the interface between the coating and the polymer substrate, so as to obtain a high-conductivity and high-bonding-strength metallized coating on the surface of the polymer substrate. The method combines the advantages of cold gas dynamic spraying technology and friction stir processing technology, and opens up a new process route for polymer and polymer-based composite material surface metallization.

The application relates to an alloy skin forming die and method, and belongs to the technical field of metal plastic working, and solves the problems of low profile precision, poor integrity and high cost of an alloy skin in the prior art. The alloy skin forming die comprises an upper die and a lower die, and further comprises a gas quenching die. The alloy skin forming die provided by the application can be used for aluminum alloy local large deformation skin forming, an aluminum alloy local large deformation skin is prepared through a friction stir processing / fluid forming method, the manufactured aluminum alloy local large deformation skin has high precision and good integrity, and the aluminum alloy local deformation capacity can be improved. The alloy skin forming die provided by the application can also be used for aluminum lithium alloy skin forming, an aluminum lithium alloy skin is prepared through a superplasticity / gas quenching forming method, and finally, the aluminum lithium alloy skin not only has high profile precision, but also has high tensile strength performance, the process flow is simple, the processing cost is low, and the aluminum lithium alloy skin has good integrity and consistency.

The application provides a method for regulating degradation rate of biomagnesium alloy in urinary system. The method comprises the following steps: S1, melting magnesium alloy raw material under protective atmosphere to obtain magnesium alloy ingot; S2, homogenizing the magnesium alloy ingot under inert atmosphere to obtain base material after cooling; S3, stirring friction processing the base material to obtain biomagnesium alloy with predetermined size, wherein the magnesium alloy raw material is composed of the following components by weight percentage: Y: 2-3 wt.%, Nd: 1-2 wt.%, Gd: 0-1 wt.%, Zn: 0-1 wt.%, Ca: 0-1 wt.%, Sr: 0-1 wt.%, and the balance is magnesium and impurity elements. The method can regulate the degradation rate of biomagnesium alloy in urinary system.

The application provides a method for additive manufacturing composite friction stir processing ordered construction of ultra-fine grain network structure, which is characterized by the following steps: through synchronous friction stir processing in electric arc wire additive manufacturing, strong plastic deformation of the friction stir processing is utilized to cause mechanical crushing of the deposited state organization, and a cross friction stir processing mode is combined to obtain an ultra-fine grain network structure; a repeated deposition process causes the organization which has been subjected to strong plastic deformation to undergo recovery recrystallization and grain growth, different span friction stir processing is utilized to cause ordered construction of the deposited state organization grain gradient, and finally, the construction of the component material of the ultra-fine grain three-dimensional network structure is realized.

The invention provides a eutectic high-entropy alloy and a preparation method thereof, and relates to the technical field of high-entropy alloys, and the preparation method comprises the following steps: carrying out stirring friction processing on a eutectic high-entropy alloy matrix, so that the eutectic high-entropy alloy matrix obtains an equiaxed structure with an ultra-fine grain size, and carrying out a cold rolling and heat treatment process on the basis to obtain the eutectic high-entropy alloy with the ultra-fine grain size. An equiaxed structure with a nanocrystalline size is obtained; the crystal grains of the equiaxed structure are nanocrystalline, and the phase structure is a double-phase or multi-phase structure; the double-phase or multi-phase structure under the nanometer equiaxed structure has a low-energy coherent interface, and the grain growth driving force at the high temperature can be remarkably reduced by replacing a high-energy high-angle grain boundary with the low-energy coherent interface. Therefore, the nano eutectic high-entropy alloy disclosed by the invention has excellent mechanical properties and thermal stability. The tensile strength exceeds 1800 MPa under the room temperature condition, and the grain growth temperature exceeds 0.6 time of the melting point.

The invention discloses a method for processing and modifying a zirconium-based alloy structure based on cross friction stir. The method comprises the following steps: S1, mounting a zirconium-based alloy plate on friction stir equipment; s2, the zirconium-based alloy plate is subjected to first-time stirring friction machining; s3, the zirconium-based alloy plate is subjected to second-time stirring friction machining, the machining direction of the second-time stirring friction machining and the machining direction of the first-time stirring friction machining intersect to form an angle alpha, the heat input quantity of the second-time stirring friction machining is smaller than the heat input quantity of the first-time stirring friction machining, and the heat input quantity is the rotating speed and the advancing speed of the stirring head; s4, repeating the steps S2 and S3 for 2-5 times; and S5, stress relief annealing treatment is conducted on the zirconium-based alloy plate. The modified structure is more uniform, grain refinement and equiaxalization are achieved, good plasticity is kept while high strength is obtained, and the technical problem that strength and plasticity are inverted in a traditional severe plastic deformation method is solved.

The application discloses a copper and copper alloy crack repairing method based on friction stir repair, and relates to the technical field of defect repairing, and comprises the following steps: step S1, pretreating copper material, and machining irregular cracks into regular grooves; step S2, selecting welding wire, feeding the welding wire into the groove, and pre-connecting the welding wire and the groove by arc preheating; step S3, performing friction stir processing on the pre-connected part of the welding wire, and repairing the groove by the thermal-mechanical coupling effect; and step S4, repeatedly performing steps S2 and S3 according to the groove depth and width to realize single-layer or multi-layer repairing of the welding wire in the groove until the groove is completely repaired. The application realizes the friction stir repairing process of large-size cracks and irregular cracks by combining cutting processing, arc preheating processing and friction stir repair, has low heat input, high repairing quality and a wider application range.

The invention provides a stirring friction processing pretreatment method for a wire material, and relates to the technical field of metal plastic processing, and the stirring friction processing pretreatment method comprises the following steps: S1, configuring a stirring head: the stirring head comprises a stirring shaft and a stirring needle arranged at the end part of the stirring shaft; s2, material pretreatment is conducted, specifically, a material groove is formed in the surface of the to-be-machined metal plate, and the material groove is filled with a composite material; s3, stirring friction processing: driving a stirring head to rotate through a motor, carrying out stirring friction processing on an area containing the material groove on the metal plate to be processed, and forming a stirring area in the metal plate; and S4, blank cutting, wherein in the stirring area, a blank plate with the rectangular cross section in the horizontal direction is cut. Through plastic deformation of stirring friction processing and the configured special stirring needle, deep and uniform rheology of the material can be realized, the problem of insufficient plasticity of the material is effectively avoided, and the problems of interface reaction and grain coarsening caused by a traditional pretreatment mode are avoided.

The present application belongs to the technical field of laser additive manufacturing, in particular to a method for reducing anisotropy of titanium alloy by laser additive manufacturing and friction stir processing. The method comprises the following steps: step one, obtaining TC11 powder and performing drying treatment; step two, using a set laser scanning strategy, laser powder deposition is performed on the dried TC11 powder in a layered form to obtain a first laser cladding layer; step three, friction stirring is performed on the first laser cladding layer according to a set stirring path until the first laser cladding layer is completely processed; and step four, steps two to three are repeated to complete laser cladding and friction stir processing layer by layer to obtain a formed part. The present application combines the forming advantages of laser additive manufacturing and the microstructure modification advantages of friction stir processing, adopts an "interlayer instant compounding" mode, and constructs a composite manufacturing process, thereby efficiently reducing the anisotropy of TC11 titanium alloy components without additional alloying or complex heat treatment.

A method of processing high-strength steel includes providing a first piece of high-strength steel. Friction stir processing the first piece of high strength steel is performed by pre-heating an area in advance of a friction stir welding tool and moving the friction stir welding tool between 500 mm and 300 mm per minute to attain a mixed zone having a mixed zone temperature at the mixed zone between a eutectoid temperature and a forge welding temperature from a combination of the friction from the friction welding tool and the step of pre-heating.

The application discloses a kind of high-strength low-sawtooth rheological 5xxx aluminum alloy plate and its preparation method and application, belong to metal material processing technical field.The application adopts three-stage synergistic process: step 1: 5xxx aluminum alloy plate alloy is carried out two-stage high-temperature annealing pretreatment;Step 2: 5xxx aluminum alloy plate after step 1 processing is carried out friction stir processing (FSP);Step 3: 5xxx aluminum alloy plate after step 2 processing is carried out rolling deformation.The processing method of the application, process is simple, short cycle, low energy consumption, can make 5xxx aluminum alloy plate yield strength ≥389 MPa, tensile strength ≥407 MPa, elongation ≥7.5%;The average amplitude of sawtooth is reduced to low level of 0.28 MPa simultaneously, the application has high strength, good plasticity and the comprehensive performance of extremely inhibiting sawtooth rheological, provides new way for high service reliability 5xxx aluminum alloy plate preparation.

The application discloses an aging strengthening aluminum alloy plate end face friction stir processing method and belongs to the technical field of aluminum alloy thick plate preparation and processing. The solid solution state aging strengthening aluminum alloy plate is butted with a dissimilar plate and is clamped and fixed, and a starting plate and a leading-out plate are arranged on the side of the aging strengthening aluminum alloy plate and the dissimilar plate. A stirring needle is arranged at the bottom end of a stirring head, the distance between the outer edge of the stirring needle and the end face of the aging strengthening aluminum alloy plate is 0.01-5 mm, the stirring head is screwed into the starting plate, the aging strengthening aluminum alloy plate is subjected to underwater friction stir processing treatment or liquid nitrogen cooling friction stir processing treatment, the processed aging strengthening aluminum alloy plate is taken down, and aging treatment is carried out. The application can improve the organization layering phenomenon of the plate through the plastic flow of the material in the plate thickness direction, improve the interlayer bonding strength of the plate, and effectively prevent the end face layering cracking of the plate.

The application discloses a kind of based on hot-pressing and friction stir processing composite preparation aluminum nickel energetic material method, aluminum powder, nickel powder and additive are weighed in proportion, then the aluminum powder, nickel powder and additive weighed are mixed evenly, and mixed material is obtained, mixed material is placed into mould and is hot-pressed by hot-pressing forming process Hot-pressing composite, prepared by metallurgical reaction with certain shape block blank;Aluminum nickel composite blank is plastically processed by friction stir processing process, and finally aluminum nickel energetic material is obtained.The application is suitable for manufacturing larger aluminum nickel energetic material structural member, and the preparation process does not need vacuum sintering, the manufacturing cycle is shorter, and the production cost is lower.The structural strength and reaction energy release density of the aluminum nickel energetic material prepared by the application are higher, meet the demand of weapon equipment for efficient damage, and have good application prospect.

The invention discloses an aluminum-based composite material-aluminum alloy connecting piece which comprises an aluminum-based composite material and aluminum alloy connected to one end of the aluminum-based composite material through friction stir welding. The aluminum-based composite material and the aluminum alloy are subjected to metallurgical bonding before friction stir welding, and a metallurgical bonding interface is formed at the bonding position of the aluminum-based composite material and the aluminum alloy; the invention further discloses a friction stir forming method of the aluminum-based composite material-aluminum alloy connecting piece, the method for connecting and forming the aluminum-based composite material and the dissimilar material is obtained in the mode that the procedures of casting, powder metallurgy, friction stir machining and the like are combined, and the problem that the aluminum-based composite material and the dissimilar metal material are difficult to connect is solved. The reliability of connection forming of the aluminum-based composite material and the dissimilar metal is improved, the service safety of the aluminum-based composite material and the dissimilar metal material under the high-low temperature alternating condition is improved, and meanwhile the production cost is reduced.

The application provides a corrosion-resistant titanium alloy β Titanium alloy and surface modification method thereof, belong to alloy modification technical field.The application includes in β A layer of nano Zn particles is laid on the surface of titanium alloy base material, a gradient structure bottom layer containing Zn is constructed by adopting a friction stir processing technology, the treated base material is handled by compression plasma flow, and a dense smooth surface layer combined with the gradient structure bottom layer containing Zn is constructed.The application constructs a gradient structure bottom layer containing Zn by adopting a friction stir processing technology, handles by compression plasma flow, constructs a dense smooth surface layer combined with the gradient structure bottom layer containing Zn, and is characterized by the following advantages: β The titanium alloy surface forms a composite modified layer with longitudinal gradient structure and low roughness surface layer.The corrosion resistance of the titanium alloy in a simulated physiological environment is significantly improved β The titanium alloy in a simulated physiological environment is significantly improved, and the process is physical modification without harmful reagents, and is suitable for the mechanical matching and biocompatibility requirements of bone implants.

A method of friction stir processing (FSP) includes contacting a first workpiece with a FSP tool, where the first workpiece is a low-melting temperature metal or alloy and the FSP tool is a single-body FSP tool having a diamond working surface. The method also includes rotating the FSP tool in contact with the first workpiece at an interface and generating thermal energy at the interface to heat the first workpiece. The method further includes conducting thermal energy away from the interface with the FSP tool, and friction stirring the first workpiece at a temperature of the FSP tool below 800° C.

The invention discloses an L12 type multi-principal element high-entropy intermetallic compound particle reinforced ultra-fine grain aluminum-based composite material and a preparation method thereof. According to the aluminum-based composite material, Co 38.5%, Ni 38.5%, Al 13Ti 3Ta3Nb 3.5 B 0.5 (at.%) multi-principal-element high-entropy intermetallic compound particles with an L12 ordered structure are adopted as a reinforcing phase, and aluminum alloy is adopted as a matrix. The preparation method comprises the following steps: (1) preparing L12 type multi-principal element high-entropy intermetallic compound powder; (2) carrying out ball milling and mixing to obtain composite powder; (3) surface treatment of the aluminum alloy substrate; (4) prefabricating a multi-principal-element high-entropy intermetallic compound particle reinforced aluminum matrix composite blank through a cold spraying technology; and (5) performing water-cooling-assisted friction stir processing on the prefabricated blank to obtain the ultra-fine grain aluminum-based composite material. The composite material integrates various beneficial configuration factors such as high toughness of a multi-principal-element high-entropy intermetallic compound, ultrafine grains of an aluminum alloy matrix and strong interface bonding performance, has excellent comprehensive mechanical properties, and has wide application prospects in the fields of traffic transportation, aerospace and the like.

The invention belongs to the technical field of laser additive manufacturing, and particularly relates to a method for reducing anisotropy of titanium alloy through a laser additive and friction stir composite process. Comprising the steps that 1, TC11 powder is obtained and dried; 2, a set laser scanning strategy is used, laser powder deposition is conducted on the dried TC11 powder in a layered mode, and a first laser cladding layer is obtained; step 3, performing stirring friction on the first laser cladding layer according to a set stirring path until the first laser cladding layer is completely processed; and fourthly, the second step to the third step are repeated, laser cladding and friction stir composite machining is completed layer by layer, and a formed part is obtained. According to the method, the forming advantage of laser additive manufacturing and the structure modification advantage of friction stir machining are combined, an interlayer instant compounding mode is adopted, the composite manufacturing process is constructed, and the anisotropy of the TC11 titanium alloy component is efficiently reduced under the condition that additional alloying or complex heat treatment is not needed.

The invention relates to an aluminum-based composite material and a preparation method and application thereof, and belongs to the technical field of metal material processing. The preparation method of the aluminum-based composite material comprises the following steps that an aluminum-based base metal alloy is subjected to melting treatment, high-entropy alloy particles are added when the aluminum-based base metal alloy is in a molten state, ultrasonic-assisted stirring is conducted, demolding and cooling are conducted after pouring, heat treatment is conducted after linear cutting, stirring friction machining treatment is conducted after cooling, and the aluminum-based composite material is obtained. According to the method, FeCoCrNiAlTi high-entropy alloy particles (HEAp) are added into the Al-Cu-Mg alloy, so that the aluminum-based base metal alloy and the high-entropy alloy are fully combined, and matrix grains are further refined, so that the distribution uniformity and the interface bonding capacity of the high-entropy alloy and the room-temperature and high-temperature tensile properties of the whole material are improved.

This invention provides a method for additive manufacturing of TC11 titanium alloy based on a composite additive manufacturing process of friction stir processing and laser metal deposition, belonging to the field of metal processing technology. The method includes: drying TC11 titanium alloy powder to obtain dried TC11 titanium alloy powder; grinding and cleaning a TC4 forged substrate as a matrix for laser metal deposition; depositing the dried TC11 titanium alloy powder onto the matrix using a synchronous powder feeding laser metal deposition process to obtain a deposited TC11 titanium alloy; and placing the deposited TC11 titanium alloy on a friction stir processing stage for friction stir processing to obtain a stirred TC11 titanium alloy. This invention transforms the coarse lamellar structure into a fine and uniform equiaxed α+β phase structure without changing the α / α′+β phase composition of the alloy. Compared with the pure laser metal deposition state, the microhardness of the TC11 titanium alloy is increased by 7.75%–13.31%, the tensile strength is increased by more than 5.39%, and the wear resistance is significantly improved. This invention provides an effective approach for microstructure control and performance optimization of additively manufactured titanium alloys.

The invention belongs to the technical field of metal additive manufacturing. The invention particularly relates to an electric arc additive manufacturing process for improving the strength and plasticity of aluminum alloy, a special wire and a preparation method thereof. The wire comprises the following components in percentage by mass: 7.0 to 8.0 percent of Zn, 1.8 to 2.5 percent of Mg, 1.2 to 2.0 percent of Cu, 0.15 to 0.3 percent of Sc, 0.1 to 0.2 percent of Zr, 0.2 to 0.3 percent of TiN, less than or equal to 0.1 percent of impurity element Si, less than or equal to 0.15 percent of Fe and the balance of Al. TiN particles and aluminum powder are used as raw materials, and an Al-TiN intermediate alloy is prepared through multi-pass stirring friction processing; raw materials are added according to the components of the wire for smelting, and an aluminum alloy ingot is obtained after casting; extruding, rolling and post-processing the aluminum alloy cast ingot to obtain a finished wire; and a special wire and a CMT + P mode are adopted for electric arc additive manufacturing. According to the method, the Sc and Zr elements and the TiN particles are jointly added, the use amount of the TiN particles can be greatly reduced while the structure refining effect is guaranteed, and through the CMT + P mode in electric arc additive manufacturing, the gas content of an additive layer is obviously reduced, and the strength and plasticity of an additive component are greatly improved.

This invention relates to the field of sheet metal processing equipment, and discloses a multi-source ultrasonic friction stirring processing device, including a fixed outer cylinder, a stationary shoulder, an ultrasonic probe, an amplitude transformer, a transducer, a first ultrasonic generator, a tool holder, a stirring head, an amplitude transformer transducer, a conductive slip ring, a second ultrasonic generator, and a feeding mechanism. The lower end of the fixed outer cylinder is connected to the stationary shoulder. The tool holder is located inside the fixed outer cylinder. The stirring head is connected to the lower end of the tool holder, and the lower end of the stirring head is flush with the lower end of the stationary shoulder. A stirring needle is provided at the lower end of the stirring head. The ultrasonic probe, amplitude transformer, transducer, and first ultrasonic generator are connected sequentially, and the ultrasonic probe is connected to the stationary shoulder. The amplitude transformer transducer is located on the tool holder. The conductive slip ring is sleeved and connected to the outside of the amplitude transformer transducer and is electrically connected to the second ultrasonic generator. The feeding mechanism communicates with the interior of the stationary shoulder. This invention can smoothly promote material softening and flow, reduce material rheological stress, and prevent a significant temperature increase.

The invention provides a preparation method of a magnesium alloy with high electromagnetic shielding performance, and belongs to the field of hot working of magnesium alloy materials. The magnesium alloy comprises the following components in percentage by mass: 1.5-2.5% of zinc, 2.5-3.5% of yttrium and the balance of magnesium, according to the invention, a specific heat treatment process system is designed for a specific magnesium alloy; according to the system, the magnesium alloy is subjected to underwater friction stir (UFSP) processing, and a precipitated phase in a magnesium alloy matrix is crushed and refined; the SE values of the magnesium alloy with the high electromagnetic shielding performance at 3000 MHz and 6000 MHz are 98 dB and 93 dB, 101 dB and 91 dB and 105 dB and 92 dB respectively, the SE values of the contrast values are 74 dB and 64 dB and 84 dB and 67 dB respectively, and the problem that the electromagnetic shielding performance of the magnesium alloy within the high frequency range is poor is solved.