1539 results about "Magnesium alloy" patented technology

The invention provides a magnesium alloy electric drive main shell mold machining precision control method and system, and belongs to the field of precision numerical control machining. The method comprises the steps that dynamic milling force, key point temperature and position signals of all shafts are synchronously collected through a multi-source sensor; a recursive least square method is adopted to identify the dynamic rigidity and damping coefficient of the tool-workpiece system on line, and the thermal deformation drift distance is calculated in combination with a temperature signal; predicting a three-dimensional deformation error vector in real time based on the dynamic model, thermal deformation and geometric errors, and constructing a space compensation field; macro motion compensation is achieved by modifying numerical control program coordinate points, and meanwhile high-frequency micro-amplitude compensation is conducted through a spindle tail end fast tool servo system. And establishing an adaptive disturbance observer to perform online estimation on unmodeled disturbance and feed-forward compensation, and realizing online self-tuning of model parameters in combination with in-situ measurement feedback. Real-time sensing, full-band dynamic compensation and closed-loop self-adaptive control of multi-source errors are achieved, and the machining precision and long-term stability of the mold are remarkably improved.

The invention belongs to the technical field of material processing, and discloses a magnesium alloy casting semi-solid injection molding method and application, and the method comprises the following steps: checking and adjusting a semi-solid injection machine, a casting mold and other equipment to be in a normal state, and placing magnesium alloy particles in a designated area of a hopper; putting a long nozzle of the semi-solid injection platform into the center of a mold sprue; setting the temperature of each section of a mold temperature controller, a charging barrel and a nozzle; preserving heat for a period of time after the temperature of the charging barrel reaches a set value, so that the temperature of materials in the charging barrel is uniform; setting the injection rate, the cooling time, the material return distance and the melt pressure of the semi-solid injection machine; and after a release agent is quantitatively sprayed to the mold, a semi-solid injection program is started, and a casting is obtained. The AS41B magnesium alloy particles with good heat resistance are adopted as the raw material, the semi-solid injection molding method is combined, a melting furnace is not needed, only heating to the semi-solid state is needed, the melt temperature is low, energy is saved, the service life of a mold is prolonged, protective gas is not needed, and the manufactured casting is good in mechanical property and high in heat resistance.

The invention provides a flame-retardant magnesium alloy with efficient forming diversification and a preparation method of the flame-retardant magnesium alloy. The flame-retardant magnesium alloy comprises the following components in percentage by mass: 4.0-10.0% of Al, 0.2-1.6% of Ca, 0.01-0.5% of Mn, 0.1-1.5% of RE, less than or equal to 0.05% of inevitable impurities and the balance of Mg, and the added RE is one or any combination of Ce, Sm, La and Sr. The preparation method comprises the following steps: smelting and casting, granulating and pulping, and performing pressure injection molding. According to the preparation method, diversified efficient forming of complex curved surfaces, thin-wall parts, special-shaped components and the like can be achieved through cooperative regulation and control of components, the process and the structure, and the obtained flame-retardant magnesium alloy is compact in structure, has the multi-level structural characteristics including a spherical primary solid phase, a fine solidification secondary phase and a grain boundary net-shaped eutectic phase and meanwhile has good flame retardance and mechanical performance; the ignition point is 750-1200 DEG C, the yield strength is 130-200 MPa, the tensile strength is 230-300 MPa, the ductility is 5-20%, and the aluminum alloy is suitable for industrial production.

The invention relates to the technical field of die-casting production and manufacturing of metal parts, in particular to a magnesium alloy die-casting die device. The mold comprises a mold mechanism, the mold mechanism comprises a first mold assembly, a second mold assembly and a feeding mechanism, a plurality of receding openings are formed in the peripheral sides of the first mold assembly and the second mold assembly, liquid pouring gates and cavities are formed in the first mold assembly and the second mold assembly, and the feeding mechanism comprises a feeding barrel and a sprue spreader; when the first mold assembly and the second mold assembly are closed, the mold core is located in the mold cavity; the core pulling assembly comprises a fixing frame connected with the mold core and a driving device connected with the fixing frame; the overflow discharging system comprises an overflow groove, an exhaust channel and an exhaust mechanism; and the pre-jacking mechanism is configured to act on the die-casting metal part during die opening. The technical problems of turbulence air entrapment, shrinkage cavity shrinkage porosity, demolding damage and the like are effectively solved, and the production quality and efficiency of magnesium alloy die-casting parts are improved.

The invention discloses a high-corrosion-resistance magnesium alloy and a preparation method and application thereof, and belongs to the technical field of magnesium alloys, the high-corrosion-resistance magnesium alloy is based on multi-element rare earth microalloying and dispersed Mg17Al12 phase synergistic regulation, in the high-corrosion-resistance magnesium alloy, a fine dispersed Mg17Al12 second phase is evenly distributed in a whole magnesium matrix, and the high-corrosion-resistance magnesium alloy has the advantages that the high-corrosion-resistance magnesium alloy is obtained; the magnesium alloy has the beneficial effects that the magnesium alloy is good in corrosion resistance, uniform corrosion of a magnesium matrix is promoted, and the micro-galvanic corrosion effect between the Mg17Al12 phase and the magnesium matrix is greatly weakened, so that serious local corrosion of the magnesium alloy in a traditional AZ91 alloy is converted into a uniform corrosion behavior, and the corrosion resistance of the magnesium alloy is greatly improved.

The invention discloses a magnesium alloy electric drive main shell mold wear detection method and system based on machine vision, and belongs to the technical field of mold predictive maintenance. According to the method, three-dimensional point cloud, a surface texture image and an infrared thermogram of a mold are synchronously collected, and point cloud data fused with multi-modal information is generated through multi-sensor joint calibration and high-precision registration; geometric, texture and thermodynamic features are extracted and fused from the features, and a cross-modal feature vector is constructed; intelligent judgment of the wear level of the mold and accurate prediction of the remaining service life are achieved through the trained LightGBM ensemble classification model and the long-short-term memory network time sequence regression model; and finally, associating and visualizing the evaluation result and the three-dimensional model, and automatically generating a structured detection report. According to the method, comprehensive quantification, intelligent evaluation and accurate prediction of mold wear are realized, and the detection efficiency and the scientificity of maintenance decision are remarkably improved.

The invention relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method of the high-temperature-resistant flux-cored wire. The high-temperature-resistant flux-cored wire containing the rare earth elements comprises a welding wire skin and a flux core. The flux core comprises the following raw materials of dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, ferro-aluminum, potassium cryolite, potassium titanate, sodium titanate, fine iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, nitrided ferrochrome, bismuth oxide, auxiliaries and the balance reduced iron powder. The auxiliary agent is a mixture of a zirconium-iron alloy, a titanium-iron alloy and an aluminum-magnesium alloy. A specific alloy auxiliary is introduced into the flux core to protect stable transition of rare earth yttrium, yttrium and multiple components synergistically optimize the weld joint performance, 253MA heat-resistant steel is matched, slag and electric arc regulation and control components and a reasonable process are matched, and the welding quality of the welding wire is improved.

The application belongs to the technical field of magnesium alloy and provides a low anisotropy magnesium alloy, which comprises the following raw materials in percentage by mass: Gd 5.80-7.20 wt%, Y 0.02-2.00 wt%, Zr 0.30-0.60 wt%, Zn 0-0.60 wt%, Mn 0-0.10 wt%, Sb 0.02-0.3 wt%, Sr 0.02-0.05 wt%, Sn 0.04-0.1 wt%, and the balance being magnesium. The application also provides a method for preparing large structural parts in a short process. The application utilizes the atomic misplacement and the difference in elastic modulus between the matrix and the Gd and Y elements to improve the mechanical properties, thereby ensuring the basic performance indicators of the alloy system, and utilizes the combined action of rare earth elements and precise control of the forming process to realize the short process preparation of large structural parts.

The invention discloses a high-toughness corrosion-resistant semi-solid injection molding magnesium alloy and a preparation method thereof, and belongs to the technical field of metal materials. The magnesium alloy comprises the following chemical components in percentage by weight: 8.6 to 11 percent of aluminum, 0.5 to 1 percent of zinc, 0.05 to 0.4 percent of manganese, 0.05 to 0.2 percent of calcium, 0.6 to 2 percent of rare earth element RE and the balance of magnesium and inevitable impurities. The preparation method of the alloy comprises the following steps: (1) adding raw materials according to the component proportion, smelting into magnesium alloy melt, pouring into a mold, and molding to obtain a magnesium alloy ingot; (2) cutting the cast ingot into magnesium alloy semi-solid blank particles; (3) performing injection molding to obtain a molded part; (4) solid solution heat treatment; and (5) performing two-stage aging heat treatment. The magnesium alloy has high toughness and corrosion resistance, and is suitable for semi-solid injection molding. The forming process can achieve near-net forming of complex components, and castings are few in defect, compact in structure and wide in application prospect.

The invention discloses a titanium-magnesium intramedullary nail and a designing and manufacturing method thereof, and the designing and manufacturing method comprises the steps that multiple working modes of the titanium-magnesium intramedullary nail are defined according to use requirements, a mode specification table is generated, and the mode specification table comprises main structure parameters, simulated bone trabecula structure parameters and a magnesium alloy filling scheme corresponding to each working mode; based on the mode specification table, optimization design of parameter mapping is conducted, a customized parameter combination of the titanium-magnesium intramedullary nail is determined, and the customized parameter combination comprises pore distribution and magnesium alloy gradient degradation configuration; a 3D digital model of the titanium-magnesium intramedullary nail is generated through modeling of the mode specification table, a titanium-magnesium intramedullary nail prototype is manufactured through a low-temperature 3D printing process, and magnesium alloy filling and micropore channel integration are completed through customized parameter combination in the period; the process of designing, optimizing, forming and compositing is achieved; according to the method, a mode specification table and parameterization mapping serve as links, the titanium-magnesium intramedullary nail integrated design and manufacturing process is constructed, and therefore multi-mode parameter customization is achieved while the manufacturing stability is guaranteed.

The invention provides a bio-based super-hydrophobic coating magnesium alloy material with anti-icing and corrosion-resistant functions as well as a preparation method and application of the bio-based super-hydrophobic coating magnesium alloy material. According to the material, a polylipoic acid-metal ion-hydrophobic carbon black coating is constructed on the surface of the pretreated magnesium alloy, so that the key problems that the corrosion rate of the magnesium alloy is high and the surface of the magnesium alloy is easy to freeze in practical application are solved. The coating is firmly combined with a matrix through multiple hydrogen bond effects, and the coating is endowed with rapid self-repairing capability by virtue of synergistic dynamic effects of disulfide bonds, hydrogen bonds and metal coordinate bonds. And meanwhile, the doped hydrophobic carbon black particles obviously improve the surface super-hydrophobic performance. The self-repairing characteristic is combined with the super-hydrophobic structure, so that corrosion medium infiltration is effectively blocked, and the corrosion process of the magnesium alloy is greatly delayed. In addition, the coating has photo-thermal and electrothermal effects, active anti-icing and efficient deicing can be achieved, and the application potential of the magnesium alloy in a severe environment is remarkably expanded.

The invention discloses a magnesium alloy die casting punching device, which belongs to the technical field of punching and comprises a base, a punching seat is slidably connected onto the base, a driving mechanism is connected onto the punching seat, the driving mechanism drives the punching seat to move, an ultrasonic vibration generator is arranged on the punching seat, and a punching tool bit is fixedly connected onto the ultrasonic vibration generator. A blanking hole is formed in the base and located under the punching tool bit, after the magnesium alloy die casting is fixed to the base, the ultrasonic vibration generator transmits vibration to the punching tool bit, and the punching tool bit punches the magnesium alloy die casting. The punching tool bit is subjected to ultrasonic vibration, burrs generated in the punching process are effectively reduced, the appearance quality and the size precision of the magnesium alloy die casting are improved, effective breakage of the roots of the burrs can be achieved, the burrs are removed more thoroughly, the qualified rate of products is increased, an additional deburring technology is not needed, the production efficiency is improved, and the production cost is reduced. And meanwhile, the production cost is also reduced.

The invention discloses a high-thermal-conductivity Mg-Zn magnesium alloy suitable for rheoforming and a preparation and processing method of the high-thermal-conductivity Mg-Zn magnesium alloy. The alloy comprises the following components in percentage by weight: 1-8% of Zn, 0.5-5% of Cu, 0.2-2% of Sn, 0.2-1% of Sc and the balance of Mg and inevitable impurities. The preparation and processing method comprises the following steps: (1) preparing raw materials according to the composition of the alloy components, and smelting by adopting a medium-frequency induction furnace and taking mixed gas of tetrafluoroethane and argon as a protective atmosphere; (2) mechanical stirring and ultrasonic synergistic stirring are combined to form a uniform melt; (3) preparing semi-solid slurry with a solid phase ratio of 35-50%; (4) forming; (5) cooling and opening the mold; (6) the obtained rheoforming blank is heated to 340-430 DEG C, heat preservation is conducted for 2-12 h, and after heat preservation is finished, quenching is conducted immediately, and cooling is conducted to the room temperature; (7) pre-aging; and (8) aging. By reasonably designing alloy components and optimizing rheoforming parameters, the defects of shrinkage, hot cracking and segregation of a conventional cast Mg-Zn alloy are overcome, and meanwhile, high heat conductivity and mechanical properties are guaranteed.

The invention belongs to the field of metal additive manufacturing, and particularly relates to a high-strength and high-toughness electric arc fuse wire additive rare earth magnesium alloy component and a preparation method thereof. The high-strength and high-toughness electric arc fuse wire additive rare earth magnesium alloy component is prepared from, by mass, 7.0%-7.4% of gadolinium, 0.6%-1.0% of yttrium, 0.4%-0.5% of zirconium and the balance Mg, wherein inevitable impurities are smaller than or equal to 0.03%. The preparation method comprises the steps of wire material preparation, electric arc fuse wire additive manufacturing, solid solution, water quenching and aging treatment, tissue refinement, texture regulation and control and strengthening phase uniform precipitation are achieved, and the comprehensive mechanical property of a component is remarkably improved. According to the obtained high-strength and high-toughness electric arc fuse wire additive rare earth magnesium alloy component, the yield strength and the tensile strength are larger than 230 MPa and 340 MPa correspondingly, the ductility is larger than 19%, and the application requirements of light-weight structural parts for high specific strength and high ductility can be met.

The invention provides a weak-texture Mg-Al-Zn-Ca-Er magnesium alloy plate and a preparation method, and relates to the technical field of design and preparation of new magnesium alloy materials. The magnesium alloy comprises the following components in percentage by mass: 1.081 to 1.215 percent of Al, 1.496 to 1.647 percent of Zn, 0.135 to 0.229 percent of Ca, 2.925 to 4.786 percent of Er and the balance of Mg and inevitable impurities. The preparation method comprises the steps of raw material weighing, raw material smelting solution treatment, clamping plate rolling and annealing treatment. According to the preparation method, the weak-texture Mg-Al-Zn-Ca-Er magnesium alloy plate is prepared through component regulation and control and process step control, the room-temperature comprehensive mechanical property and the room-temperature deformability of the weak-texture Mg-Al-Zn-Ca-Er magnesium alloy plate are synergistically improved, and the weak-texture Mg-Al-Zn-Ca-Er magnesium alloy plate has both strength and plasticity and is low in anisotropy; the preparation method is simple and easy to operate, green and environment-friendly, low in cost, short in process, high in efficiency and beneficial to industrial large-scale production and popularization.

The invention discloses a method for improving the thermal stability of a gradient nanocrystalline structure, and belongs to the technical field of metal material processing. According to the method, Mg-RE series alloy is used as a matrix, a matrix alloy ingot is heated for solution treatment, surface strengthening is carried out after water quenching and cooling, a gradient nanocrystalline layer is formed on the surface layer of an alloy sample, finally, the alloy sample is transferred into an aging oven for low-temperature aging, and cooling is carried out, so that the magnesium alloy is obtained. According to the method, the thermal stability of the magnesium alloy gradient nanocrystalline is improved through a synergistic strategy of component design and low-temperature aging, so that the grain growth rate of Mg-RE alloy gradient nanocrystalline structures treated by various different surface strengthening methods in a high-temperature environment can be remarkably reduced; the core bottleneck that a traditional magnesium alloy gradient nanocrystalline material is poor in thermal stability and single in applicable surface treatment method is solved; and the process does not need special equipment, can be seamlessly connected with various existing magnesium alloy surface strengthening production lines, and is low in process cost, simple and convenient to operate and easy to industrially popularize.

The invention discloses an aluminum magnesium alloy energy-saving melting device and method based on electromagnetic induction preheating, and belongs to the technical field of aluminum magnesium alloy preparation. The device comprises a preheating curve generation module used for determining a preheating curve based on the weight of an electromagnetic preheating station and the position of a magnesium ingot; the preheating module is used for controlling an induction heating device to carry out electromagnetic preheating on the magnesium ingot based on the preheating curve; the feeding module is used for calculating the clamping force and the acceleration of the manipulator for grabbing the magnesium ingot and the feeding angle after the manipulator reaches the target position, and controlling the manipulator to feed the magnesium ingot into the crucible based on the parameters; the air supply adjusting module is used for adjusting the air supply amount of the variable-frequency fan; and the heating control module is used for controlling the heating process of the heating device to the outside of the crucible. According to the scheme, the heating time can be shortened through electromagnetic preheating, the heat loss is reduced, and the overall energy consumption can be reduced and the melting efficiency and the alloy quality can be improved by combining real-time temperature field monitoring and molten pool recognition.

The invention discloses a method for refining a rare earth magnesium alloy structure through combination of composite Zr salt and an ultrasonic field, the composite Zr salt is added as a chemical refiner in the magnesium alloy smelting process, and low-temperature ultrasonic treatment is carried out before pouring. Low-temperature chemical refinement and physical refinement are combined, the composite Zr salt is adopted to replace a traditional Mg-Zr intermediate alloy to serve as a chemical refiner, the refinement cost is reduced, magnesium element oxidation burning loss is avoided, on the basis, an ultrasonic physical field is introduced before melt pouring, Zr element sedimentation and decline effects are effectively avoided, and the mechanical property of the alloy is improved. The yield of Zr particles and the nucleation rate of crystal grains are increased, the Zr particles can play a nucleation role, and the effects of refining the solidification structure of the rare earth magnesium alloy and purifying the melt are achieved, so that the comprehensive mechanical property of the rare earth magnesium alloy is improved, and the rare earth magnesium alloy is suitable for the aerospace field with strict requirements for light weight, high specific strength and high temperature resistance.

The invention relates to a magnesium alloy semi-solid injection molding system and a magnesium alloy semi-solid injection molding method. The magnesium alloy semi-solid injection molding system comprises an injection unit, a mold, a cooling system, a detection unit and a control unit. The mold is provided with a plurality of cooling subareas, and the cooling subareas are divided according to the wall thickness of a casting corresponding to a mold cavity. The cooling system comprises a plurality of cooling channels and a plurality of flow adjusting pieces, the cooling channels are arranged in the mold, and the cooling channels and the flow adjusting pieces are arranged in a one-to-one correspondence mode. The detection unit is used for obtaining the solid fraction of the magnesium alloy slurry in the cavity of the mold in real time. The control unit is in communication connection with the detection unit and the flow adjusting part, and the control unit and the cooling system adjust the cooling rate of each cooling channel according to the control instruction. The state of the slurry can be sensed in real time, cooling behaviors of all areas of the mold can be dynamically and accurately regulated according to the state, and the production quality of magnesium alloy semi-solid castings is improved.

The invention discloses a neutron shielding magnesium alloy plate and a preparation method thereof, and relates to the technical field of magnesium alloy materials, and the neutron shielding magnesium alloy plate comprises the following components in percentage by mass: 5-20% of Gd, and the balance of Mg and inevitable impurities. The preparation method comprises the following steps: S1, preparing the raw materials of each component, and performing pretreatment; s2, all the component raw materials pretreated in the step S1 are molten, and then a melt is subjected to deslagging, casting and cooling treatment to obtain an as-cast magnesium alloy cast ingot; s3, the as-cast magnesium alloy cast ingot prepared in the S2 is cut into a magnesium alloy plate, solution treatment is conducted, and then water cooling is conducted; s4, grinding the surface of the magnesium alloy plate subjected to solution treatment in S3, and rolling; and S5, the magnesium alloy plate rolled in the step S4 is subjected to aging treatment, and the neutron shielding magnesium alloy plate is obtained.

The invention discloses a method for brightening the surface of a rare earth magnesium alloy wire for electric arc additive manufacturing, and belongs to the technical field of metal material forming processes. The process comprises the following steps: wetting a wire material; ultrasonically cleaning with a cleaning agent; cleaning for the second time; and drying the wire. The method is used for solving the problem that a graphite layer on the surface of the wire is difficult to peel off after high-temperature drawing, the multiple ultrasonic cleaning method is adopted, efficient cleaning of the wire is achieved, the graphite protective layer can be thoroughly removed, damage to the wire is small, the cleaning efficiency is high, the application range is wide, and the method is suitable for industrial production. And meanwhile, an oxide layer formed in the wire preparation process can be synchronously removed, so that the surface state of the wire is remarkably improved.

The invention relates to the technical field of magnesium alloys, in particular to a low-density, high-modulus and ultrahigh-strength magnesium-based composite material and a preparation method thereof.The preparation method comprises the steps that SiC reinforcement particles are pretreated; the raw materials are proportioned according to the mass percent of the components of the magnesium alloy; melting pure magnesium, sequentially adding alloy elements, uniformly stirring, cooling to a semi-solid temperature interval, adding the pretreated SiC reinforcement particles, and casting in a preheating mold to solidify, so as to obtain a magnesium-based composite material cast ingot; the cast ingot is sequentially subjected to solution treatment and extrusion forming; carrying out secondary solution treatment on the magnesium-based composite material bar subjected to extrusion forming; and performing rotary swaging deformation and intermediate annealing treatment on the magnesium-based composite material bar subjected to secondary solution treatment to obtain the ultrahigh-strength magnesium-based composite material. Therefore, the problems that in the prior art, magnesium alloy is insufficient in strength and modulus, a magnesium-based composite material easily generates casting defects and is difficult to deform at room temperature, and the performance of the material is weakened due to grain growth during high-temperature deformation are solved.

The invention discloses a hydrothermal passivation method for a calcium carbonate film layer on the surface of a magnesium alloy, and belongs to the technical field of magnesium alloy surface treatment.The hydrothermal method is adopted for conducting passivation treatment on the magnesium alloy coated in a water bath, a new compact layer is formed under an original calcium carbonate deposition film with defects, and internal passivation of the coated magnesium alloy is achieved. And the corrosion resistance of the coated magnesium alloy is obviously enhanced.

The present application discloses a magnesium alloy unit including a work table, a melting cylinder attached to the work table, a transport mechanism, and an injection unit, wherein the transport mechanism cooperates with the melting cylinder, and the injection unit cooperates with the transport mechanism, and when die-casting a magnesium alloy, the magnesium alloy unit is configured to perform a first step in which the transport mechanism transports magnesium particles to fill the melting cylinder, which then smelts the magnesium particles to form molten metallic magnesium, and a second step in which the injection unit cooperates with the transport mechanism to inject the molten metallic magnesium from the injection head of the melting cylinder into the die-casting machine body. A dual-unit die-casting machine is also disclosed.

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 relates to the technical field of magnesium steel welding, in particular to a magnesium steel ultrasonic stirring friction lap welding method based on Zn interlayer thickness adaptation, which comprises the following steps: performing surface treatment on an AZ31 magnesium alloy plate and a DP600 steel plate to realize gradient thickness Zn foil interlayer type selection; a Zn foil middle layer is flatly laid and attached to the surface of the DP600 steel, and an AZ31 magnesium alloy plate covers the surface of the DP600 steel and is aligned and fixed; through a Zn foil friction stir overlap welding experiment, a Zn middle layer with the optimal joint performance is screened; performing ultrasonic-assisted welding based on the Zn middle layer with the optimal thickness; and the joint quality is verified by adopting microstructure, comprehensive mechanical property and internal defect detection. According to the magnesium steel ultrasonic stirring friction lap welding method based on Zn interlayer thickness adaptation, a Zn interlayer thickness gradient screening and performance adaptation mechanism is established, a microstructure-mechanical property-internal defect full-dimension detection system is constructed, the core contradiction that magnesium steel is poor in metallurgical compatibility and large in melting point difference is cooperatively solved, and the interface metallurgical bonding performance is enhanced.

The invention relates to a low-cost high-strength corrosion-resistant magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by mass: 6-11% of Al, 0.4-0.6% of Zn, 0.2-0.6% of Mn, 0.2-0.4% of Y, 0.2-0.6% of Ca and the balance of Mg and inevitable impurities. A small amount of Ca and Y elements are added, on one hand, an alpha-Mg matrix structure can be refined, beta phase distribution is more uniform, and the mechanical property is improved; and on the other hand, the solid solubility of the alloy element Y in an alpha-Mg matrix can be improved by adding the Ca element, the compactness of a surface oxidation film and a corrosion product film is promoted, compared with other rare earth elements, the potential difference between Al-Ca and Al-Y phases formed by Ca, Y and Al and the magnesium matrix is smaller, micro galvanic corrosion is smaller, and the corrosion resistance of the alloy is remarkably improved.

The invention relates to the technical field of alloy surface treatment, and particularly discloses a treating agent for zinc-aluminum-magnesium alloy surface corrosion prevention and a preparation method thereof.The treating agent for zinc-aluminum-magnesium alloy surface corrosion prevention is composed of a treating agent body component and a treating agent curing component, wherein the treating agent main body component comprises the following raw materials: bisphenol A epoxy resin, antioxidant toughening cellulose, a composite solvent, a flatting agent and a defoaming agent; the curing component of the treating agent comprises the following raw materials: a tackifying curing compound and a composite solvent; when acting on the surface of the zinc-aluminum-magnesium alloy, the treating agent prepared through the method has excellent adhesive force, toughness, oxidation resistance and anti-corrosion effect, the zinc-aluminum-magnesium alloy can be effectively protected, and the service life of the zinc-aluminum-magnesium alloy is long.

The invention discloses a high-toughness flame-retardant magnesium alloy and an extrusion preparation method thereof, and belongs to the technical field of metal materials. The magnesium alloy comprises the following components in percentage by mass: 4.0-8.0% of Gd, 1.5-4.0% of Y, 0.3-0.8% of Zr, 0.1-0.5% of Ca, less than or equal to 0.05% of impurities and the balance of Mg. The preparation method comprises the following steps: after smelting and casting, carrying out multi-stage homogenization heat treatment on a cast ingot; then hot extrusion is conducted, and rapid cooling is conducted immediately at the speed larger than or equal to 50 DEG C / min after extrusion; then carrying out warm finishing deformation at the temperature of 200-350 DEG C; and finally, aging treatment is conducted. Through cooperation of component design and process regulation and control, the average grain size of the alloy is smaller than 5 microns, the room-temperature tensile strength is larger than or equal to 450 MPa, the ductility is larger than or equal to 5%, the ignition point is larger than or equal to 900 DEG C, and the problem that the strength, toughness and flame retardance of the magnesium alloy are difficult to consider is effectively solved.

The invention discloses a magnesium-rare earth alloy with a grinding tooth-shaped interface structure and a preparation method and application thereof, and belongs to the technical field of magnesium alloy material processing. According to the magnesium-rare earth alloy with the meshed tooth-shaped interface structure, a W phase is directionally separated out around the boundary of an Al2 (Gd, Y) phase. The Mg-Gd-Y-Zn-Al alloy serves as a base, a high-modulus Al2 (Gd, Y) phase is introduced, directional precipitation of a W phase around the boundary of the Al2 (Gd, Y) phase is achieved through multiple times of ultrasonic vibration composite multi-axial vibration coupling and secondary solution treatment, the Al2 (Gd, Y) phase with a tooth-shaped microcosmic interface structure is constructed, compatible deformation with a magnesium matrix is achieved, the Al2 (Gd, Y) phase is refined through composite deformation machining, stress concentration is relieved, and the mechanical property of the alloy is improved. And meanwhile, the strength and plasticity of the alloy are improved through torsional deformation of the LPSO phase. Through the formation of the special microstructure, the high strength, the high modulus and the high ductility of the magnesium-rare earth alloy are synchronously improved.