78 results about "Supersaturated solid solution" patented technology

The invention belongs to the technical field of steel production, and relates to a method for producing a low-cost high-strength galvanized sheet based on thin-strip cast rolling. After molten steel is subjected to thin-strip continuous casting to obtain a casting strip, the casting strip is rolled into a thin strip in a single pass mode, the thin strip is coiled after being cooled through aerial fog, then hot-dip galvanizing is conducted on a continuous hot-dip galvanizing production line after acid pickling is conducted, the annealing temperature of a galvanizing section is 640-720 DEG C, and then the thin strip is placed at the room temperature for more than 35 days after leveling is conducted. According to the method, supersaturated solid solution of C and N atoms in the thin strip casting and rolling sub-rapid solidification process is fully utilized, the high solid solution state is maintained by combining hot rolling and galvanizing section short-time and low-temperature design, finally, strength jump is driven by means of natural aging after production, and the high-strength galvanized plate with good stamping performance is obtained under a simple C-Si-Mn component system. The problems that the high-strength galvanized plate forming capacity of a traditional high-carbon route is insufficient, and the alloy cost of a low-carbon microalloy route is high are solved, and meanwhile carbon emission in the product production process is greatly reduced.

According to the stainless steel and titanium alloy welded joint strengthening method based on CFD simulation, a stainless steel component is a cylindrical tube shell, one end of the cylindrical tube shell is completely open, and a through hole is formed in the other end of the cylindrical tube shell; the titanium component is a thin plate, and the thin plate is arranged in the cylindrical tube shell and is fastened by applying pressure; a FLOW-3D simulation platform is adopted, boundary conditions applied to six surfaces of a computational domain are all constant-pressure boundary conditions, and laser power, pulse frequency, defocusing amount, welding speed and material attributes serve as input to predict temporal and spatial changes of temperature, fluid flow and element distribution in a molten pool; and based on the prediction result of the FLOW-3D simulation platform, the nanometer laser is incident from one side of the thin plate at the predicted laser power, pulse frequency, defocusing amount and welding speed, the laser scanning track is a circular path, cooling is conducted to the room temperature after welding is completed, a supersaturated solid solution in a welding seam is reserved, and the situation that intermetallic compounds are separated out again is avoided.

The invention belongs to the technical field of nickel-based alloy material processing and forming, and particularly relates to a preparation method and application of a powder metallurgy and isothermal forging In738 disc shaft ring piece. The hot isostatic pressing technology is adopted for preforming the blank, internal gaps and cracks of the material are eliminated, the structure is homogenized, element segregation is improved, the fatigue life is prolonged, and a plastic blank is provided for subsequent isothermal forging. Furthermore, the temperature difference between the blank and the mold is reduced through preheating treatment, deformation resistance sudden change caused by local chilling is avoided, and microcrack initiation is inhibited. In addition, dynamic recrystallization is promoted through isothermal forging, a fine equiaxed crystal structure is obtained, and the high-temperature strength is improved; and through solution treatment, grain coarsening is inhibited, a supersaturated solid solution is reserved, and driving force is provided for aging precipitation. And then a dual-mode gamma'phase strengthening system is formed through a two-stage aging process, and the endurance life is optimized. Therefore, the high-temperature comprehensive mechanical property of the In738 nickel-based alloy is improved, and the use requirement of the In738 nickel-based alloy at high temperature is met.

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 provides a 6063 aluminum alloy gas cylinder forging bar extrusion production method which comprises the steps of burdening, casting, cast bar homogenization, extrusion, quenching, online drawing, fixed-length cutting and finished product annealing, in the extrusion process, an extrusion die comprises a flow guide plate and a die which are connected with each other, a flow guide pit is formed in the center of the flow guide plate and is a cylindrical through hole, and the flow guide hole is communicated with the die. The working chamber comprises a first conical area, a second conical area and a cylindrical area which are sequentially connected. By optimizing the alloy component proportion, extrusion stripes and oxidation flaws are reduced, the overall strength and subsequent machinable plasticity and turning performance of the bar for gas cylinder forging are improved, the supersaturated solid solution degree after quenching is inhibited by reducing the ingot casting homogenizing temperature and the extrusion cooling rate, and the yield of the bar for gas cylinder forging is improved. The ductility and the uniformity of the bar for forging the gas cylinder are greatly improved, and mechanical lines cannot be generated on the surface of the gas cylinder obtained after forging.

The invention discloses a preparation method of a high-strength and high-conductivity aluminum alloy profile, which comprises the following steps: 1) carrying out solution treatment on an aluminum alloy raw material to obtain a supersaturated solid solution; (2) the supersaturated solid solution is subjected to low-temperature extrusion treatment, and the aluminum alloy profile is obtained; and thirdly, the aluminum alloy profile is heated, and the high-strength and high-conductivity aluminum alloy profile is obtained. According to the method, hot extrusion is replaced by low-temperature extrusion, so that the aluminum alloy profile generates a remarkable cold hardening effect, the strength of the alloy is greatly improved, meanwhile, severe plastic deformation at the extrusion temperature generates a large number of intragranular dislocations, Mg and Si elements are promoted to be quickly and fully dispersed and separated out, the alloy generates a precipitation strengthening effect, and the conductivity is improved.

The invention belongs to the technical field of aluminum lithium alloy heat treatment, and provides a heat treatment method for improving the obdurability of an aluminum lithium alloy plate. The heat treatment method comprises the following steps: sequentially carrying out solid solution heat treatment, rolling pre-deformation treatment, pre-stretching treatment and artificial aging treatment on the aluminum-lithium alloy plate. According to the method, through optimized solid solution heat treatment, a second phase separated out of the aluminum lithium alloy plate in the cold deformation state is subjected to solid solution in a matrix, and a supersaturated solid solution of the aluminum lithium alloy plate is obtained; a large amount of dislocation is introduced in rolling pre-deformation, work hardening is introduced, the dislocation density is increased, and the aging precipitation power of the aluminum-lithium alloy plate is improved; residual stress in the rolling pre-deformation process is eliminated through pre-stretching treatment, and the aluminum-lithium alloy plate which is subjected to stress removal and is flat in appearance is obtained; a large number of strengthening phases such as T1 phases and theta'phases are separated out through artificial aging treatment, and strengthening and toughening of the aluminum-lithium alloy plate are achieved; the yield strength reaches 520 MPa or above, the tensile strength reaches 590 MPa or above, and the ductility reaches 8% or above.

The application belongs to the technical field of alloy, and particularly relates to a pulse magnetic field heat treatment method for A356 aluminum alloy. The heat treatment method provided by the application comprises the following steps: sequentially performing solid solution treatment and aging treatment on the aluminum alloy casting under the condition of a pulse magnetic field; the holding time of the solid solution treatment is 20-50 min, and the holding time of the aging treatment is 30-60 min. The pulse magnetic field is applied in the holding stage of the solid solution treatment, so as to improve the Gibbs free energy of the system, improve the dissolution and diffusion rate of strong elements such as Si and Mg in the matrix, and obtain a supersaturated solid solution in a short time. In the holding stage of the aging treatment, the pulse magnetic field reduces the thermodynamic energy barrier of the second phase precipitation of the alloy, improves the nucleation rate of the second phase, and accelerates the precipitation and growth of the second phase. The heat treatment in the pulse magnetic field greatly shortens the heat treatment time, and the heat treatment time of the A356 aluminum alloy is only 50-110 min.

The invention discloses a preparation method of an aluminum alloy conductive part. The aluminum alloy conductive part with high strength and high conductivity is prepared through continuous extrusion, online quenching, subzero treatment and aging treatment. The aluminum extrusion part is subjected to aging treatment after being subjected to subzero treatment, segregation of solute atoms and optimized distribution of precipitated phases after subzero treatment can reduce electron scattering centers, an electron conduction path is optimized, and the electric conductivity is improved; and more, finer and uniformly distributed aging phases can effectively hinder dislocation movement, so that the strength of the aluminum alloy is improved. During aging treatment, solute atoms in the supersaturated solid solution are separated out in the form of a precipitation phase, the concentration of the solute atoms in a matrix is reduced, the lattice distortion degree is reduced, and the electron scattering probability is reduced, so that the electric conductivity is improved; the formation of the precipitated phase makes the structure more refined and uniform, so that the strength and hardness of the aluminum alloy material are improved, and the prepared aluminum alloy conductive part has high strength and high conductivity.

The invention provides a method for improving the corrosion fatigue performance of aluminum and / or magnesium alloy by combining laser peening with peak aging and an aluminum and / or magnesium alloy finished product. The method comprises the following steps: S1, carrying out solution treatment on to-be-treated aluminum and / or magnesium alloy; s2, the aluminum and / or magnesium alloy subjected to solution treatment is subjected to laser shot peening treatment; and S3, the aluminum and / or magnesium alloy subjected to laser peening treatment is subjected to peak aging treatment. According to the method, the initial nanometer precipitated phase can be dissolved through the solid solution treatment to form a single-phase supersaturated solid solution, dislocation pinning can be effectively promoted through the laser shot peening treatment, more and more stable gradient dislocation structures are reserved in the subsequent peak value aging process of the aluminum and / or magnesium alloy, power is provided for nucleation and growth of the nanometer precipitated phase, and the mechanical property of the aluminum and / or magnesium alloy is improved. And a surface layer overaging state-core peak aging state continuous transition structure is constructed in combination with subsequent peak aging treatment, and the continuous transition structure endows the aluminum and / or magnesium alloy with corrosion fatigue resistance and high strength characteristics.

The present application relates to the technical field of stainless steel thin strip continuous casting, and provides a short-process preparation method of high-strength stainless steel thin strip based on cyclic solid solution and aging precipitation, which comprises the following steps: steel liquid component design and smelting; double-roller thin strip continuous casting; afterheat hot rolling; cyclic solid solution treatment; aging strengthening treatment, and 304 stainless steel thin strip is obtained. By introducing specific amounts of Al and Ti elements into the 304 stainless steel, controlling the continuous casting and rolling process parameters, relying on the sub-rapid solidification advantage of thin strip continuous casting, omitting homogenizing annealing and multi-pass rolling, and implementing cyclic solid solution treatment after rolling, the grains are refined, and a highly uniform supersaturated solid solution and a large number of dislocations are obtained. Finally, 500-600 DEG C aging strengthening is performed, so that Al and Ti are combined with elements such as Ni in the austenitic stainless steel matrix to form a dispersed precipitate phase. Through the synergistic effect of the three of precipitation strengthening, fine-grain strengthening and dislocation strengthening, the strength level is significantly improved while the toughness of the stainless steel is maintained.

This invention relates to the field of alloy forming technology, specifically to a method for preparing Ti-Al medium-entropy alloys based on selective laser melting. The method includes preparing raw material rods, gas atomization powder preparation, 3D modeling, preheating and forming the matrix, powder spreading and leveling, 3D printing pretreatment, pre-powder spreading, and laser printing. This method features high melting rate and high solidification rate, forming unique microstructures such as ultrafine grain structure, metastable phases, and supersaturated solid solutions. By combining alloy composition design, gas atomization powder preparation, and selective laser melting, the resulting parts possess excellent comprehensive mechanical properties and can be used to prepare complex structural parts. Furthermore, it features a short preparation cycle, high material utilization, and rapid forming.

The invention discloses an aluminum alloy for simulating a neutron irradiation transmutation silicon effect and a manufacturing method thereof, and belongs to the field of aluminum alloys. The manufacturing method of the aluminum alloy for simulating the neutron irradiation transmutation silicon effect comprises the following steps: determining the Si element content in the alloy according to the state of the aluminum alloy to be simulated, and preparing a supersaturated solid solution raw material with corresponding components, an aluminum alloy bar is prepared through a powder metallurgy process, and an aluminum alloy structure for simulating the generation of the transmutation silicon effect is obtained through heat treatment. According to the aluminum alloy preparation method, the simulated alloy can be prepared to effectively simulate a precipitated phase structure formed by transmutation reaction after the aluminum alloy is irradiated by neutrons for a long time, and the aluminum alloy preparation method plays an important role in researching the influence of irradiation transmutation products on the performance of the aluminum alloy; the current situation that irradiation performance evaluation of a metal material with a solid transmutation product is extremely dependent on neutron irradiation resources is relieved, the research efficiency is improved, and therefore the design level and the safety performance of an aluminum alloy structural part in a research reactor are improved.

The invention relates to the technical field of metallurgy, in particular to a high-toughness and high-density tungsten alloy material and a preparation method thereof. The preparation method of the high-toughness and high-density tungsten alloy material comprises the following steps that raw material powder is subjected to mechanical ball milling, and homogeneous modified composite powder is obtained; the raw material powder is tungsten powder, nickel powder, iron powder, cobalt powder and lanthanum powder; the homogeneous modified composite powder comprises refined tungsten powder and a nanocrystalline nickel-based supersaturated solid solution; performing cold isostatic pressing on the homogenized modified composite powder to obtain a cold-pressed blank; the cold-pressed blank is subjected to liquid-phase sintering, and a sintered blank is obtained; the temperature of the liquid phase sintering is 1475 to 1530 DEG C, and the heat preservation time is 60 to 130 minutes; and the sintered blank is subjected to circulating vacuum heat treatment, and the high-toughness and high-density tungsten alloy material is obtained. According to the prepared tungsten alloy material, the strength is greatly improved, and meanwhile high plasticity and toughness can still be kept.

The invention discloses low-density corrosion-resisting steel containing copper Fe-Mn-Al-C and a preparation method of the low-density corrosion-resisting steel, and belongs to the technical field of metal material preparation. The corrosion-resistant steel comprises the following chemical components in percentage by mass: 0.3 to 0.8 percent of C, 18 to 22 percent of Mn, 7 to 10 percent of Al, 2.0 to 3.5 percent of Cu and the balance of Fe and inevitable impurities. Meanwhile, the chemical components meet the corrosion-resistant synergistic coefficient K, and K is larger than or equal to 0.09 and equal to Cu / (Mn + Al) and smaller than or equal to 0.11. The corrosion-resistant steel has a single-phase austenite matrix structure, and the Cu element is distributed in a supersaturated solid solution state in the matrix. The method is used for preparing the corrosion-resisting steel, and through the reverse design of'component cooperative locking 'and'forbidden aging solid solution process', pitting corrosion inducements are eliminated while low density is guaranteed, and excellent long-acting chlorine corrosion resistance is achieved.

This invention provides a coupled method for thermal cycling control and online cooling to maintain supersaturated solid solution. By integrating multiple online cooling devices and a closed-loop temperature control strategy, it achieves precise management of interlayer temperature, effectively suppressing premature precipitation of Y and O elements during the additive manufacturing process, maintaining a high degree of supersaturation in the matrix, and providing a favorable condition for the formation of ultrafine nano-precipitates in subsequent heat treatment. Simultaneously, the linkage between interlayer temperature window control and process parameter adjustment ensures that each layer experiences a similar thermal history, significantly improving the microstructure consistency along the height direction of the component and eliminating performance gradient differences present in traditional processes. The introduction of a periodic thermal cycling management strategy further releases thermal stress, homogenizes the temperature field, and prevents precipitation coarsening through rapid cooling, thereby improving the overall mechanical properties of the material. This invention provides an efficient, controllable, and reliable process solution for the additive manufacturing of high-performance ODS-RAFM steel.

This invention relates to the field of high-nitrogen duplex stainless steel preparation technology, and provides a method for preparing high-nitrogen duplex stainless steel. The method for preparing high-nitrogen duplex stainless steel provided by this invention involves placing stainless steel powder with a nitrogen content of 0.6 wt% or greater into a laser additive manufacturing apparatus for molding. During the molding of the high-nitrogen duplex stainless steel, the laser power is set to 150W-350W, the laser scanning spacing is 60-150 μm, the laser scanning layer thickness is 30-65 μm, and the laser scanning rate is 200-1200 mm / s. During molding, the material solidification rate is 10... 5 -10 7 K / s. This invention utilizes laser additive manufacturing to produce 10 5 -10 7 K / s ultra-fast solidification of the alloy matrix, with w(N)≥0.6% supersaturated solid solution in the alloy matrix, without Cr2N precipitation, enables PREN to exceed 50 and reach 52 or more.

The application discloses a strain-induced supersaturated solid solution analysis method for a non-miscible alloy system based on mixed entropy evolution, and the method comprises the following steps: for a target A-B binary alloy, a mixed entropy-component relationship diagram of the target A-B binary alloy is drawn; the average component and the initial equilibrium phase component point of the target A-B binary alloy are calibrated in the diagram; based on the increase of the mixed degree of the entropy generation driving force, the two-phase components are predicted to evolve in the entropy increase direction during a severe plastic deformation process, until a single-phase supersaturated solid solution is formed. Based on the irreversible thermodynamic principle, the severe plastic deformation process is defined as a continuous external entropy generation source for driving the evolution of the system, through the analysis of the dynamic competition mechanism of element mixing and element demixing dominated by the entropy generation source, the formation mechanism of the supersaturated solid solution is revealed, and the application provides a universal theoretical tool for understanding and predicting the supersaturated solid solution behavior of the non-miscible alloy system under the severe plastic deformation.

The invention discloses spherical H13-TiB2 composite powder as well as a preparation method and application thereof, and belongs to the technical field of metal-based composite powder preparation. According to the preparation method disclosed by the invention, an in-situ reaction-diffusion-growth mechanism of reinforced phase particles in a traditional in-situ synthesis TiB2 particle reinforced steel-based composite material is converted into a supersaturated solid solution-nucleation-precipitation-growth mechanism of a reinforced phase forming element (Ti-B), so that the problem that in powder metallurgy and additive manufacturing, the particle size is large is solved; the problems that when traditional premixed powder is adopted as a raw material, mixing of a reinforced phase and a matrix raw material is not uniform, impurities are prone to being introduced, the sphericity degree is damaged, and reinforced phase particles in the prepared composite material are incomplete in reaction and prone to agglomeration are solved.

The present invention belongs to the technical field of aluminum alloy preparation, and specifically relates to an aluminum alloy and an ultrasonic quenching treatment method thereof. The ultrasonic quenching treatment method of the aluminum alloy includes performing quenching treatment on the supersaturated solid solution obtained after solution treatment of the aluminum alloy; and performing intermittent ultrasonic treatment on the aluminum alloy after the quenching treatment, and ensuring close contact between the aluminum alloy and the ultrasonic probe during the ultrasonic treatment; performing aging treatment on the aluminum alloy after the intermittent ultrasonic treatment, and then air-cooling to room temperature. The ultrasonic quenching treatment method of the aluminum alloy in the present invention can solve the problems of high cost, large energy consumption, long time consumption and inability to fully exert the comprehensive performance of the aluminum alloy existing in the traditional heat treatment process.

The application discloses a method for improving nucleation density of large-size single crystal diamond hetero-epitaxy based on iridium-amorphous carbon pre-implantation layer, which comprises the following steps: firstly, pretreating a single crystal silicon substrate through acid washing, acetone or ethanol ultrasonic cleaning method; sequentially epitaxially growing a nanometer-thickness yttrium stabilized zirconium oxide (YSZ) single crystal film buffer layer and an iridium single crystal film functional layer on the treated single crystal silicon surface; then, pre-implanting an amorphous carbon film on the surface of the iridium / YSZ composite substrate, and performing vacuum annealing stress relief and polishing graphite phase large particle removal treatment on the amorphous carbon film to obtain a smooth and flat surface; finally, epitaxially growing single crystal diamond on the surface of the iridium-amorphous carbon pre-implantation layer, and cutting and removing the composite substrate to obtain large-size single crystal diamond hetero-epitaxy. The method utilizes the amorphous carbon implantation layer to accelerate the dissolution-precipitation process of carbon ions entering the iridium film to form a supersaturated solid solution during bias nucleation, increases nucleation sites, and improves nucleation density, which is of great significance for preparing large-size high-quality single crystal diamond.

This invention discloses a multi-cavity thin-walled battery tray-type aluminum alloy profile for new energy vehicles and its preparation method, relating to the field of battery tray technology. The internal chemical composition of the aluminum alloy profile, by mass percentage, includes: Si: 0.65%–0.75%, Mg: 0.70%–0.85%, Cu: 0.10%–0.20%, Mn: 0.10%–0.18%, Cr: 0.06%–0.12%, Ti: 0.05%–0.10%, Sc: 0.02%–0.08%, Zr: 0.05%–0.12%, Fe≤0.20%, B≦0.10%, with the balance being Al. This invention successfully constructs a nanoscale dispersed reinforcing phase in the matrix through stepwise pretreatment of Sc / Ti elements and a two-stage aging process. Combined with an upward dual-medium quenching technology, the high-temperature zone utilizes a scandium oxide-containing water-based medium for rapid cooling, effectively freezing the supersaturated solid solution. The low-temperature zone utilizes an oil-based medium for slow cooling, eliminating harmful residual stress and significantly improving the load-bearing capacity and collision energy absorption safety of the battery tray.

The invention relates to the field of TiNi-based shape memory alloy processing and preparation, in particular to a method for improving the superelasticity of a 4D printing TiNi-based shape memory alloy. The method comprises the steps that firstly, the 4D printing TiNi-based shape memory alloy is subjected to heat preservation for 1-3 h under the condition of 1000-1300 DEG C, then discharged out of a furnace and cooled to the room temperature in air, and the 4D printing TiNi-based shape memory alloy subjected to solution treatment is obtained; and the 4D printing TiNi-based shape memory alloy subjected to solution treatment is subjected to heat preservation for 0.5-200 h under the condition of 200-600 DEG C, then is discharged out of the furnace and is cooled to the room temperature, and the 4D printing TiNi-based shape memory alloy material subjected to solution aging treatment is obtained. According to the 4D printing TiNi-based shape memory alloy, the microstructure of the 4D printing TiNi-based alloy is adjusted through high-temperature solution treatment, so that the microstructure of the TiNi-based shape memory alloy is more uniform, a precipitated phase is promoted to be re-dissolved to form a supersaturated solid solution, then aging treatment is carried out, the precipitated phase is re-precipitated and uniformly distributed in a matrix, and the microstructure of the 4D printing TiNi-based shape memory alloy is obtained. And the hyperelastic performance of the 4D printing TiNi-based shape memory alloy is greatly improved.

The invention relates to the technical field of aluminum alloy strengthening, and particularly discloses a heat treatment method of an aluminum alloy. The heat treatment method of the aluminum alloy comprises the following steps: solution treatment: in a vacuum environment, placing the aluminum alloy at the temperature of 510-590 DEG C, and preserving heat for 9-15 hours; primary cooling is conducted, specifically, the aluminum alloy is cooled at the flow rate of 4000-12000 m < 3 > / h under the nitrogen pressure of 2-6 bar; aging treatment is conducted, specifically, in a vacuum environment, the aluminum alloy is placed at the temperature of 140-220 DEG C to be subjected to heat preservation for 8-16 hours; and secondary cooling is conducted, specifically, the aluminum alloy is cooled at the flow rate of 4000-12000 m < 3 > / h under the nitrogen pressure of 2-6 bar. Solution treatment enables a soluble strengthening phase in the aluminum alloy to be dissolved into an aluminum matrix to the maximum extent, and a uniform supersaturated solid solution is formed. The supersaturated solid solution structure at high temperature is frozen through primary cooling, and a metastable and supersaturated solid solution is formed. And through aging treatment, supersaturated solute atoms are separated out in a fine and dispersed form, so that the strength and hardness of the aluminum alloy are improved, and cracks and deformation of the aluminum alloy subjected to heat treatment are controlled within a reasonable range.

The invention discloses an alloy preparation method for improving mechanical properties based on 6110 aluminum alloy component optimization, and relates to the technical field of 6110 aluminum alloy preparation, and the alloy preparation method comprises the following steps: step 1, the 6110 aluminum alloy component is subjected to optimization design, and the 6110 aluminum alloy comprises the following components in percentage by weight: the balance of Al serving as a matrix element; and 0.05-0.1% of Cr, wherein the Cr is used for refining crystal grains. By controlling the proportion of Si / Mg and Cu / Fe key elements, the strengthening potential and the structure stability of the alloy are optimized, gradient heating smelting and composite refining technologies are combined, the melt purity and the component uniformity are improved, element burning loss is effectively reduced, crystal segregation is fully eliminated through multi-stage homogenization treatment, a uniform microcosmic foundation is laid for follow-up treatment, and the high-strength and high-toughness alloy is obtained. An ultrasonic external field is introduced into the dynamic solid solution process, and the cavitation and acoustic streaming effects of the ultrasonic external field are utilized to promote the dissolution of a strengthening phase, so that a supersaturated solid solution with higher saturation and more uniform components is obtained.

The application discloses a manufacturing method for improving the fatigue performance of an annular lip of an aircraft. The raw material is cold-work hardened at normal temperature, and then subjected to recrystallization heat treatment to increase equiaxed grains in the fiber direction of the raw material. After that, the raw material is deep-drawn to form a semi-finished product. The semi-finished product is locally cold-work hardened, and the materials in the annular excess area are extruded to the annular riveting area, so that the annular riveting area is flattened along the circumferential direction. Then, the semi-finished product is subjected to heat treatment and cooling treatment at a ladder temperature, so that the grains in the annular riveting area of the semi-finished product form finer aluminum-based supersaturated solid solution. Finally, the semi-finished product is subjected to normal-temperature circumferential expansion, so that more grains in the annular riveting area are subjected to tensile force along the circumferential direction, and the circumferential grain ratio and length are increased.

The present invention discloses a copper-clad aluminum alloy wire and its high-speed wire drawing process, which relates to the technical field of metal material processing. In the present invention, the aluminum alloy material is first subjected to cryogenic treatment and ball milling. The grains are refined, resulting in an increase in the grain boundary area, enhancing the ability to resist deformation and improving the strength. During the cryogenic treatment, high-energy ball milling is combined, so that other nano-metal particles are transformed from a supersaturated solid solution to a true solid solution, enhancing the strength and overall stability of the aluminum alloy. After copper cladding and welding in the present invention, high-temperature treatment is immediately carried out. The solute boundary layer is relatively thick and the solute components are fully diffused, so that the welded part is more stable and not easily cracked. At the same time, during the cooling process after high-temperature treatment, reduction is carried out using ethanol, so that the oxides generated in the weld seam and the bubbles generated by the metallurgical reaction at high temperature are reduced, further improving the performance of the copper-clad aluminum alloy wire while ensuring conductivity. The copper-clad aluminum alloy wire prepared by the present invention has the effect of high mechanical properties.

A high-temperature alloy precipitated phase regulation and control method based on electric field auxiliary forming comprises the steps that a precipitated phase in a matrix is dissolved through solid solution / sub-solid solution temperature pretreatment of a high-temperature alloy, and a uniform supersaturated solid solution is obtained; then performing electric field assisted high-temperature deformation on the high-temperature alloy supersaturated solid solution, applying an electric field to the high-temperature alloy to heat the high-temperature alloy to a target temperature, then performing thermal deformation, and regulating and controlling the precipitated phase of the high-temperature alloy by adjusting the strain rate and the current parameter of the auxiliary electric field in the thermal deformation process; the precipitated phase in the as-cast alloy is dissolved through pretreatment before thermal deformation, the supersaturation degree of a matrix is improved, the deformation resistance is reduced, and meanwhile a foundation is provided for regulation and control of the precipitated phase; meanwhile, by means of the influence of dislocation and an electric field on the diffusion behavior of component elements of the precipitated phase, more freedom degrees are provided for regulation and control of the precipitated phase of the high-temperature alloy by regulating and controlling the strain rate related to dislocation density, current parameters related to the electric field effect and the like.

The invention discloses a novel Al-Mg-Si-Zr-Er alloy and a preparation method thereof.According to the alloy, an Al-Mg-Si system serves as a matrix, zirconium and erbium are added according to a specific proportion, a nanoscale Al3Zr dispersed phase and an Al3Er oxidation film are formed in a microstructure through the synergistic regulation effect of elements such as manganese and zinc, and synchronous improvement of grain boundary strengthening and corrosion resistance is achieved; gravity casting is combined with a three-stage heat treatment system; dendritic segregation is effectively eliminated and uniform distribution of Zr / Er elements is promoted through homogenizing annealing; a soluble phase is fully dissolved through high-temperature solution treatment, and a supersaturated solid solution is formed; through aging treatment, nanoscale beta ''-Mg2Si and Al3 (Er, Zr) strengthening phases are induced to be dispersed and separated out; through the synergistic effect of the process, the excellent mechanical property combination that the yield strength is not smaller than 300 MPa, the tensile strength is not smaller than 360 MPa and the ductility is larger than or equal to 10% is finally achieved, meanwhile, the corrosion rate is kept to be smaller than or equal to 0.055 mm / yaar (3.5% NaCl solution), and the comprehensive performance of the Al-Mg-Si alloy is remarkably superior to that of a traditional Al-Mg-Si alloy.

The invention belongs to the technical field of metal material quenching and tempering, and particularly relates to a 7040 aluminum alloy quenching and tempering method which sequentially comprises the following steps: step 1, solution treatment: heating an aluminum alloy to enable a strengthening phase in the aluminum alloy to be fully dissolved in a matrix to form a uniform supersaturated solid solution; secondly, air mist cooling is conducted, rapid cooling is conducted after solution treatment, precipitation of a strengthening phase is restrained, meanwhile, it is guaranteed that a cooling medium evenly covers the surface of the workpiece in the cooling process, and the situation of uneven cooling is avoided; and thirdly, aging treatment is conducted, specifically, the alloy of a supersaturated solid solution is obtained through air mist cooling. The hardening and tempering process combining solution treatment, air mist cooling and aging treatment is provided, the process combination is matched with one another, the alloy performance is effectively regulated and controlled, and an existing single treatment mode is broken through.