32 results about "Friction stir processing" patented technology

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 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 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 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 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.

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 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.

The application discloses a low-cost short-process preparation method of large complex components and belongs to the technical field of material processing. The method takes a cast alloy plate as an initial material, adopts friction stir welding to weld the initial material, and then adopts multi-pass friction stir processing (i.e. single-plate friction stir welding) on the large-size plate after welding to obtain a large-size component with integral superplastic forming capability, and adopts superplastic forming to prepare a large-size complex component, and the preparation process is shown in Fig. 1. The method can convert small cast alloy plates with cast defects and coarse structures into large-size fine-grain plates with integral superplastic forming capability, and finally forms large-size complex components. The method has the advantages of short preparation process, high material utilization rate, low cost and no limitation on the size of the initial plate, and can be applied to titanium alloys, steel, aluminum alloys, magnesium alloys, high-entropy alloys and other various alloys with superplasticity, and is favorable for industrial production and application of large-size complex components.

The invention provides an electrochemical corrosion resistant aluminum-based composite material and a preparation method thereof, and belongs to the technical field of electrochemical corrosion resistant materials. The preparation method comprises the following steps: slotting, polishing and cleaning an aluminum alloy plate; the grooves formed in the aluminum alloy plate are filled with polyimide particles, and a pretreated plate is obtained; edge sealing treatment of stirring friction is conducted on the pretreated plate, and polyimide particles are embedded into the aluminum alloy plate and compacted; and carrying out multi-pass stirring friction processing treatment on the plate subjected to edge sealing treatment to obtain the PI / Al-based composite material. According to the PI / aluminum-based composite material and the preparation method thereof, polyimide particles serve as a reinforcing phase, aluminum alloy serves as a matrix, a stirring friction method serves as a processing method, homogenization structure treatment is conducted on the polyimide particles, the reinforcing phase particles are effectively mixed into the matrix, the PI / aluminum-based composite material is prepared, and the prepared PI / 6061 aluminum-based composite material has the electrochemical corrosion resistance and can be applied to the corrosive seawater environment. The process is green and environment-friendly, low in cost and good in processing effect.

The invention relates to an incremental forming heterogeneous material thin-wall part and a connection interface strengthening method thereof.The method comprises the following steps that S1, a rotating hemispherical tool head is adopted to move along a set track, a corrugated structure is machined on the surface of an upper-layer plate, and grain fragmentation is formed on the surface of the upper-layer plate; s2, a solder resist layer is arranged on the upper surface of the lower auxiliary plate, and additive manufacturing powder is laid on the solder resist layer; s3, the corrugated surface is downwards placed on the additive manufacturing powder, so that the corrugated surface and the lower auxiliary plate jointly form a sandwich structure; s4, a rotating flat-bottom tool head is adopted for conducting stirring friction machining on the upper surface of the upper-layer plate, an additive manufacturing sintering curing structure is formed and connected with the corrugated face of the upper-layer plate, and meanwhile the sandwich structure is subjected to plastic deformation through axial feeding of the flat-bottom tool head; and S5, the heterogeneous material thin-wall part is obtained. Compared with the prior art, the method has the advantages that the interface bonding strength is improved, the load transmission efficiency and the cooperative deformation capacity are improved, high flexibility is achieved, and a high-quality interface is obtained.

The invention relates to a high-purity precious metal target material and a short-process preparation method thereof, and belongs to the technical field of target material preparation. The high-purity precious metal target material comprises, by mass, 0.01%-0.03% of rare earth elements and the balance precious metal. The short-process preparation method comprises the steps of vacuum melting and casting, friction stir processing, heat treatment and machining forming, rare earth elements are added into precious metal, electromagnetic stirring vacuum melting and casting and friction stir processing are carried out, and short-process preparation of the high-purity precious metal target material is achieved. According to the preparation method, the problems of low purity, low density, coarse internal crystal grains, poor crystal grain size uniformity, long preparation process and long period of a precious metal target can be solved, the high-quality target material with relatively high purity, relatively high density, uniform internal crystal grain size and small crystal grain size is obtained, and the application in electronic products is realized.

The invention discloses a self-adaptive low-temperature strong crushing device and method for an aluminum-steel interface intermetallic compound, and belongs to the field of aluminum-steel dissimilar metal welding. According to the method, after the aluminum and the steel are subjected to melt-brazing, the aluminum-steel intermetallic compound is treated by combining a mechanical crushing mechanism and a low-temperature cooling mechanism, and IMC refining and uniform distribution are achieved in the friction stir machining process, so that the mechanical property of a joint is remarkably improved, and even a major breakthrough that the strength of the joint exceeds that of an aluminum base material is achieved. According to the stirring friction processing device, stirring and cooling can be conducted at the same time, a constant pressure detection and feedback control system is integrated, the resistance borne by the strong deformation needle during stirring is obtained according to the pressure sensor, a control instruction is sent to the stirring friction processing device, and the stirring friction processing device can conduct stirring and cooling at the same time. And parameters such as position and rotating speed of the stirring head are controlled. According to the method, active regulation and control of the aluminum-steel interface IMC are achieved, and a reliable new medium plate welding scheme is formed on the process level.

The application provides a feeding stirring friction processing device based on double-shaft retractable, which comprises a shell, a compression ring with a feeding hole, a shearing sleeve and a stirring needle are installed at the bottom end of the shell, the stirring needle and the shearing sleeve are axially, rotationally and complexly movable, a material guiding mechanism or a material cutting mechanism is arranged between the compression ring and the shearing sleeve, and the bottom surface of the shearing sleeve and the stirring needle is provided with a groove-shaped stirring structure; the application provides a multi-position processing method using the processing device, a flexible filler high-performance repairing method and a method for solving the shaft movement and vibration in the solid phase stirring process. The application avoids the phenomenon of tool blockage, realizes multi-position additive manufacturing, realizes accurate control of the filler and efficient repair of complex defects, and solves the problems of joint thinning, inability to immediately fill the filler after stopping the furnace and inability to once-form flexible filler repair in the prior art.

The application discloses a kind of high-efficiency electric arc-friction stir processing additive manufacturing system and method, it is related to welding additive manufacturing technical field.Therein, manufacturing system includes control device, friction stir processing device, high-efficiency electric arc device and ultrasonic device, it has unique advantage to the processing of large engineering to be additive sample piece, effectively solve the problem of many blowholes of ordinary electric arc additive manufacturing and avoid the influence that heat input increases and causes performance to be poor.The cost of manufacturing system is low, production line is easy to copy, and can realize the additive manufacturing process of automation, in line with modern industrial production demand.Single system control is used, manufacturing process method is simple, the problem that electric arc additive quality stability is poor, large component additive efficiency is low is solved, and high-quality and high-efficiency additive manufacturing process of large component is realized.

The invention discloses a uniform superplastic deformation method and device for a multi-pass stirring friction processed titanium alloy plate, and belongs to the technical field of titanium alloy superplastic deformation. The method comprises the following steps: firstly, optimizing friction stir processing parameters by adopting an iterative method combining numerical simulation and experiments to obtain optimized friction stir processing parameters, carrying out multi-pass friction stir processing on a titanium alloy plate by adopting the optimized friction stir processing parameters to obtain a fine-grain titanium alloy plate, and then carrying out superplastic deformation on the fine-grain titanium alloy plate to obtain the fine-grain titanium alloy plate. And in the deformation process, a plurality of cooling pipes and laser emitters are distributed along the multi-pass stirring friction machining area and the interface area to carry out micro-area rapid cooling and rapid heating regulation and control on the superplastic deformation process, so that uniform superplastic deformation of the titanium alloy plate subjected to multi-pass stirring friction machining is realized. According to the method for optimizing the stirring friction machining process parameters, the titanium alloy stirring friction machining process parameters are optimized in a numerical simulation mode, and the barrier that the stirring friction machining process parameters are selected through experience traditionally is broken through.

The invention discloses a preparation method of a particle reinforced aluminum-based composite material with a sandwich structure, which comprises the following steps of: pretreating a pure aluminum plate and a high-entropy alloy particle reinforced aluminum-based prefabricated plate; then, the pure aluminum plates, the high-entropy alloy particle reinforced aluminum-based prefabricated plates and the pure aluminum plates are alternately stacked and fixed in a clamp of stirring friction machining equipment in the sequence of the pure aluminum plates, the high-entropy alloy particle reinforced aluminum-based prefabricated plates and the pure aluminum plates; the high-entropy alloy particle reinforced aluminum-based prefabricated slab is formed by taking aluminum as a base body, obtaining a high-entropy alloy particle reinforced aluminum-based composite material sintered ingot by adopting a powder metallurgy process and then slicing the high-entropy alloy particle reinforced aluminum-based composite material sintered ingot; and the three stacked plates are subjected to single-pass processing preparation through a stirring friction processing technology, and the particle reinforced aluminum matrix composite with the sandwich structure is obtained. The particle-reinforced aluminum-based composite material is combined with a laminated structure, the novel particle-reinforced aluminum-based composite material with a sandwich structure is constructed by utilizing a stirring friction processing technology, and the mechanical property of the prepared material is remarkably improved.

The invention belongs to the technical field of high-entropy alloy gradient coating preparation, and particularly relates to a high-entropy alloy gradient coating preparation method based on layer-by-layer solid phase densification, which comprises the following steps: S1, selecting a metal material as a matrix, and cleaning and roughening the surface of the matrix; s2, quantitative calculation and layer number determination of gradient coating components are carried out, and the total layer number n of the coating is larger than or equal to 3; s3, cyclic manufacturing of layer-by-layer spray deposition-solid phase densification; and S4, final surface treatment. According to the method, the plasma spraying technology and the stirring friction machining technology are combined and alternately circulated, through the circulation construction mode of layer-by-layer spraying and layer-by-layer solid phase densification, interlayer defects are effectively eliminated layer by layer, the component gradient is constructed, the densification degree is high, the bonding strength is high, and the thickness is controllable.