96 results about "Abnormal grain growth" patented technology

The invention discloses a heat treatment method of an iron-nickel-based high-temperature alloy, which solves the contradiction between stress relief annealing and performance maintenance through four-step temperature coordinated regulation and control: in the first step, MC type carbide is dissolved through solid solution, segregation is eliminated, and excessive growth of crystal grains is avoided; in the second step, roughening of M23C6 type carbides is inhibited through solid solution, and formation of fine and uniform carbides on grain boundaries is promoted so as to strengthen the grain boundaries; in the third step, the residual stress is reduced through stress relief annealing, and meanwhile grain boundary carbide growth and abnormal grain growth are avoided; and in the fourth step, uniform and stable precipitation of a gamma'phase is promoted through aging, the nanometer size and the high volume fraction are maintained, and coarsening is avoided. Through precise temperature connection, the residual stress is effectively reduced, grain growth, structure nonuniformity or performance degradation caused by traditional annealing are avoided, and finally the application requirement of the superhigh-temperature steam environment at the temperature of 650 DEG C or above is met on the premise that the mechanical property and the corrosion resistance are guaranteed.

The invention relates to the technical field of aluminum alloy heat treatment, and discloses a high-power tooth radiator aluminum alloy strengthening and toughening heat treatment method. Gradient temperature control solution treatment including at least two different temperature stages; step 2; carrying out electromagnetic auxiliary shape correction treatment, and applying an alternating magnetic field in the cooling process; step 3; the two-stage aging treatment comprises high-temperature first-stage aging and low-temperature second-stage aging; step 4; carrying out pulse type aging strengthening by adopting a periodic temperature fluctuation mode; step 5; and performing micro-arc oxidation surface treatment to generate an aluminum oxide layer in the electrolyte. Gradient temperature control solution treatment is adopted, a beta phase is fully dissolved, abnormal growth of crystal grains is inhibited, meanwhile, uniform nucleation of a GP region and dispersed distribution of a theta'phase are promoted through two-stage aging treatment, the strength and toughness of the alloy are improved, in addition, electromagnetic auxiliary shape correction and a composite residual stress elimination technology are combined, thermal stress deformation is effectively inhibited, residual stress is eliminated, and the performance of the alloy is improved. The size stability and the fatigue life are improved.

The invention provides a method for inhibiting abnormal grain growth of a 7xxx series aluminum alloy friction stir welding joint, which comprises the following steps: step 1), performing wire filling welding treatment on a to-be-welded aluminum alloy part to obtain a welding part; wherein the welding flux is an aluminum alloy containing a scandium element; (2) the welding part is subjected to friction stir welding treatment, and a friction stir welding head is obtained; and (3) post-treatment is conducted on the friction stir welding head. Welding materials used are characterized in that a certain amount of scandium is added, then differential friction stir welding treatment is carried out, the differential friction stir welding treatment is carried out by independently regulating and controlling the rotating speed of a shaft shoulder and the rotating speed of a stirring needle, and on the premise that the rotating speed of the stirring needle is greatly increased to improve material flowing, the welding efficiency is greatly improved. The low shaft shoulder rotating speed is applied to eliminate overheating, defects are avoided, pinning particles are dispersed, and the effect of completely inhibiting growth of abnormal crystal grains is achieved.

The invention provides a lithium-rich manganese-based precursor, a lithium-rich manganese-based positive electrode material, a preparation method of the lithium-rich manganese-based precursor, a preparation method of the lithium-rich manganese-based positive electrode material and a battery, the lithium-rich manganese-based precursor is composed of MnaNibM1-a-bO2, a is more than or equal to 0.55 and less than or equal to 0.75, and b is more than or equal to 0.2 and less than or equal to 0.4; m comprises at least three of Zr, Ru, Ga, B, Pb, As, Ba, Ce, La, Bi or Pt; the specific surface area of the lithium-rich manganese-based precursor is not less than 10m < 2 > / g. In the lithium-rich manganese-based precursor, the doping element M improves the component uniformity by adjusting the Zeta potential, forms a eutectic phase at the crystal boundary to inhibit the abnormal growth of crystal grains, enhances the structural uniformity, inhibits the structural collapse of the positive electrode material in circulation, and improves the cycle stability of the battery; meanwhile, pores of the lithium-rich manganese-based precursor provide channels for electrolyte permeation, active sites are increased due to the high specific surface area, lithium ion diffusion is accelerated jointly, and the specific discharge capacity of the positive electrode material is improved.

The invention relates to the technical field of preparation of silicon carbide ceramic special-shaped beams, in particular to a pressureless sintered silicon carbide ceramic special-shaped beam and a preparation method thereof.The pressureless sintered silicon carbide ceramic special-shaped beam comprises the following components and structures: material composition: a base material is silicon carbide powder, the particle size is in bimodal distribution, a main phase is 3-5 microns, and a nanophase is 0.5-1 micron; a composite sintering aid; through innovative design of material composition and structure, multi-scale synergistic reinforcement and surface gradient protection are realized, bimodal distributed silicon carbide powder is adopted as a matrix, and through the synergistic effect of a micron-sized particle skeleton and nano-particle filling pores, internal cracks caused by uneven shrinkage of a special-shaped section are remarkably reduced, so that the surface gradient protection performance is improved. And meanwhile, the composite sintering aid can inhibit abnormal growth of crystal grains, synergistically reduce the sintering temperature and reduce the deformation risk of the multi-cavity structure, the crack propagation resistance of the corner angle is greatly improved through the gradient reinforcement phase, and the problem that a hardened layer at the special-shaped corner angle is not uniform is solved through deep siliconizing reinforcement.

The invention provides a preparation method of a hard alloy material based on a high-entropy alloy bonding phase, and relates to the field of hard alloy materials, and the preparation method comprises the steps of S1, tungsten carbide powder pretreatment, S2, preparation of a WC-coated TiN core-shell structure, S3, in-situ synthesis of an interface wetting agent (Ti, Zr, Mo) CN, S4, wet high-energy ball milling and mixing, and S5, preparation of the hard alloy material. According to the hard alloy material prepared through the method, the limitation that traditional cobalt serves as a bonding phase is overcome, interface bonding between the high-entropy alloy and a tungsten carbide matrix is remarkably improved, abnormal growth of crystal grains is inhibited, generation of a brittle phase is avoided, and the hardness, toughness and high-temperature stability of the hard alloy material are remarkably improved.

The invention relates to a ceramic capacitor dielectric material and a preparation method and application thereof, and belongs to the field of ceramic capacitor dielectric materials. The problems that an X7R / X8R type ceramic capacitor material cannot meet the high-temperature application requirement, loss is high, and stability is insufficient are solved. The invention provides a dielectric material for a ceramic capacitor. The dielectric material is prepared from the following components in percentage by weight: 96.5 percent of BaTiO3, 3.5 percent of CaZrO3, 1.26 percent of NiO: Nb2O5 and 0.3 to 0.5 percent of MnCO3. According to the ceramic capacitor dielectric material, the capacitance change rate delta C / C25 DEG C is smaller than or equal to + / -15% within the range of-55 DEG C to 200 DEG C, and the X9R standard is met; the dielectric constant is as high as 4265, and the dielectric loss is as low as 0.012; the step-by-step pre-sintering and gradient sintering process inhibits abnormal growth of crystal grains, the density is improved, and the repeatability is high; the method does not need complex equipment and is suitable for industrial production.

The invention belongs to the technical field of rare earth permanent magnet materials, and particularly relates to a sintered neodymium-iron-boron magnet easy for grain boundary diffusion and a preparation process thereof. According to the process, the synergistic effect of grain growth and densification is regulated and controlled through the dynamic temperature gradient, the densification rate is preferentially increased in a high-temperature interval, and the magnet is rapidly densified and grain boundary coarsening is restrained by means of the characteristic that densification kinetics is faster than grain growth; reducing the temperature to a low-temperature interval for heat preservation, and continuing densification and restraining abnormal growth of crystal grains by utilizing an atomic diffusion limitation characteristic; cooling and heating are performed again, densification power is provided by temperature difference, and further densification is realized; the grain size is regulated, the grain boundary number is increased through the grain refinement effect, more channels are provided for grain boundary diffusion, and therefore the diffusion efficiency and the heavy rare earth element utilization rate are remarkably improved. The coercive force (Hcj) of the magnet is higher than 18 kOe, the magnetic energy product (BH) m can completely meet the commercial application requirement, the production cost is reduced, and the technological process is shortened.

The application discloses a method for preparing high-purity superfine tungsten powder by series impurity removal and microwave calcination, and relates to the technical field of refractory metal powder metallurgy. The method uses 99% and below industrial-grade ammonium paratungstate as raw material, and sequentially performs pyrolysis, two-stage physical purification, ultrasonic synergic acidolysis deep purification, microwave uniform calcination and sectional reduction. Firstly, the ammonia solution-evaporation crystallization method and the chemical precipitation method are connected in series to realize deep impurity removal, and the chemical precipitation method is used to directly obtain a nano tungsten oxide precursor, so that the morphology of the tungsten powder is guaranteed for subsequent reduction; secondly, the microwave calcination process is introduced to realize fast and green and environment-friendly uniform heating, and the hard agglomeration of the precursor is significantly reduced; finally, the sectional reduction method is adopted to effectively block the CVT effect in the reduction process, and abnormal grain growth is avoided. The method solves the problems of incomplete purification, sintering agglomeration of the precursor during reduction and out-of-control reduction particle size in the prior art, and the prepared tungsten powder has high purity and small average particle size.

A method is provided for forming a large metallic component using a friction stir welded blank. A first and second metallic plate are positioned in an abutting arrangement with corresponding faying surfaces. A backing plate is attached across the abutment. The plates are friction stir welded along the faying surfaces, the friction stir weld including a weld root that terminates in the backing plate. After welding, the backing plate is removed, including the weld root, to create a welded blank. The blank is then formed into a desired component shape, heat treated and aged to produce the final large metallic component. The resulting friction stir weld has a stable microstructure with minimal or no abnormal grain growth during high-temperature forming, heat treatment, or aging.

The invention relates to the technical field of special ceramic product preparation, and discloses a zirconium oxide secondary densification process in special ceramic part processing, which comprises the following steps: a vacuum pressure infiltration step: driving an aluminosilicate-based precursor to infiltrate into microcracks on the surface layer of a zirconium oxide workpiece by using pressure difference; a phase change interval critical rate heating step: controlling the heating rate to match the volume shrinkage of the zirconium oxide from monoclinic phase to tetragonal phase transformation, and generating a grain boundary gap to drive the precursor to deeply permeate; an in-situ reaction densification step: inducing the precursor in-situ reaction at high temperature to generate an aluminosilicate solid phase and filling crystal boundary trident points; according to the method, through a phase change coupling permeation mechanism, reactive healing of microcracks is achieved on the premise that abnormal growth of crystal grains is not caused, and the fracture toughness and the anti-aging performance of the zirconia ceramic are improved.

This invention discloses a high-boron Y–Ce–Co co-substituted nanocrystalline material and its preparation method. The general chemical formula of the nanocrystalline material, expressed as a percentage by mass, is: [RE x (Y y Ce 1‑y ) 1‑x ] z Fe 100‑z‑u‑v‑w Co u M v B w The composition is defined as follows: 0 ≤ x ≤ 0.9, 0.05 ≤ y ≤ 0.9, 25 ≤ z ≤ 35, 5 ≤ u ≤ 50, 0 ≤ v ≤ 3, 1.7 ≤ w ≤ 3. This invention utilizes Y–Ce–Co co-substitution to synergistically regulate the lattice occupancy, elemental valence states, and magnetic exchange interactions of the main phase, significantly improving the temperature stability of the Ce-rich system. Addressing the issues of abnormal grain growth and excessive Laves phase precipitation caused by Co introduction, increasing the mass percentage of B significantly enhances the alloy's amorphous forming ability, refines the main phase grains, and suppresses the formation of harmful second phases. Based on this compositional design, a low-linear-velocity melt rapid quenching process (12 to 18 m / s) can directly prepare materials with uniform nanocrystalline structures without subsequent crystallization annealing, achieving high coercivity and high temperature resistance while significantly reducing raw material costs.

The invention discloses a management control method for abnormal grain growth of an electronic aluminum foil, and the method comprises the steps: building an intermediate annealing-dislocation density attenuation model, a cold rolling-dislocation density proliferation model and an abnormal grain growth probability model through detecting the dislocation density in cold rolling and intermediate annealing processes; the model is used for calculating the real-time dislocation density and pre-judging the abnormal grain growth probability, the cold rolling machining amount and intermediate annealing process adjustment can be guided, the limitation brought by traditional tentative process adjustment is solved, production is promoted to be converted into data driving, and the method is suitable for medium-high voltage electronic aluminum foil production.

This invention relates to the field of special ceramics preparation technology, and discloses a process for preparing high thermal conductivity ceramic materials for high-nickel ternary cathode sintering, including: preparing magnesium aluminum spinel green blanks containing magnesium oxide, yttrium oxide and titanium oxide composite additives; performing cyclic variable oxygen pressure sintering at 1420℃ to 1480℃, controlling the furnace atmosphere to periodically switch between the first and second oxygen partial pressure states. This invention utilizes the oxygen potential difference to drive the grain boundary liquid phase to alternate between low viscosity wetting and high viscosity pinning characteristics, eliminating the rheological quiescent zone at the end of sintering, effectively suppressing abnormal grain growth while ensuring high material density, and improving the thermal conductivity and lithium erosion resistance of the ceramic sagger.

The invention relates to the technical field of alloy materials, in particular to a hard alloy material for high-speed cutting and a preparation method thereof. The material comprises a hard phase and a binding phase, wherein the hard phase is tungsten carbide particles distributed in a bimodal mode, and a gradient diffusion layer is formed on the surface of the hard phase through a shell layer containing vanadium and chromium on the interface; and the binding phase is a multi-component alloy containing cobalt, chromium, iron, nickel, molybdenum and ruthenium. The preparation method comprises the following steps: carrying out dopamine pretreatment on tungsten carbide, carrying out pyrolysis on tungsten carbide and a metal organic precursor to form a shell layer, preparing binding phase powder, mixing and granulating, forming and dewaxing, sintering and carrying out hot isostatic pressing treatment. Abnormal growth of crystal grains is inhibited through the core-shell structure, high-temperature stability and interface bonding are enhanced through the multi-element binding phase, the material has high hardness, high toughness and thermal shock resistance at the same time, the wear resistance of a tool in high-speed cutting is remarkably improved, and the service life of the tool in high-speed cutting is remarkably prolonged.

The invention relates to the technical field of silicon carbide material preparation, in particular to a reaction sintering method of a large-size silicon carbide material, which comprises the steps of raw material preparation, slip casting and reaction sintering, the gradient heating and cooling process in the reactive sintering process is divided into five stages: a low-temperature stage, a medium-temperature stage, a high-temperature stage, a cooling stage and a tempering stage. Through the synergistic effect of staged gradient heating, tempering treatment after sintering, high-pressure argon pressure sintering and silicon nitride nano powder grain boundary regulation and control, the technical problems of cracking, non-uniform density and abnormal grain growth in the sintering process of the large-size silicon carbide material are effectively solved.

The invention relates to the technical field of magnetic material processing, discloses a feeding speed adjusting method for magnetic material processing and a control system, and mainly solves the problems of abnormal growth of crystal grains and inconsistent magnetic properties caused by non-uniform temperature distribution in traditional processing. The method comprises the following steps: arranging 6-8 multispectral cameras and a 16-point magnetic sensor array in a sintering furnace, and constructing a three-dimensional thermal field monitoring network with 0.05 mm / pixel resolution; a double-channel model is adopted to predict the deformation trend, a machining area is divided into independent control grids of 5 cm * 5 cm, partition speed regulation is achieved through a multi-channel servo system, and smooth transition is conducted on adjacent grids through a linear interpolation algorithm. The control system comprises a data acquisition module, an edge calculation unit and an execution mechanism, has the functions of raw material pre-inspection, real-time monitoring and exception handling, and can realize 50ms-level quick response and + / -1.5 DEG C temperature control precision. Compared with a traditional method, the machining efficiency is improved by 25% or above, the product percent of pass is improved, and reliable technical support is provided for production of high-performance magnetic materials.

The invention relates to the technical field of heat treatment of steel and iron materials, and discloses a structure-performance cooperative control production method of a seamless steel tube for a 40Cr hollow anchor rod, which comprises the following steps: performing hot piercing on round steel to prepare a hollow tube blank; spheroidizing annealing is conducted on the hollow pipe blank; cold finish rolling is carried out after acid pickling, the total true strain is set, and the lt is calculated through a pass distribution coefficient according to a formula; 111gt, 111gt; a crystal orientation texture index; recrystallization annealing is conducted, the recrystallization annealing temperature is determined according to the spheroidizing annealing temperature in combination with the collaborative relational expression, and the heat preservation time is determined according to the total true strain in combination with the collaborative relational expression; and straightening and sizing cutting are performed to obtain a finished steel pipe. Aiming at the defect of mechanical property fluctuation caused by existing parameter isolation, a multi-process quantitative constraint model is established, and growth of abnormal grains is effectively inhibited through matching of a thermodynamic state and deformation dynamic compensation, so that a high-index oriented texture is formed in a pipe body, batch mechanical property fluctuation is reduced, and product consistency is improved.

The invention provides an automatic temperature control method for heat treatment annealing of a target material. The automatic temperature control method for heat treatment annealing of the target material comprises the step of placing the target material to be treated in an automatic temperature control device for heat treatment annealing, the automatic temperature control device controls the temperature in the device to be 150-380 DEG C for first heat treatment annealing, and then controls the temperature in the device to be 200-430 DEG C for second heat treatment annealing. The heat treatment annealing step is carried out in the automatic temperature control device, so that the problem that the qualified rate of the target material is reduced due to manual operation errors is avoided; and two-stage heat treatment annealing is adopted, stress relief and a microstructure are optimized, and deformation or abnormal grain growth caused by stress sudden release during one-time high-temperature annealing is avoided.

The invention discloses a preparation method of a high-tensile-strength and high-extensibility yttrium oxide particle reinforced tantalum-based composite material, and belongs to the field of refractory metal-based composite materials. The yttrium oxide particles are added, so that abnormal growth of tantalum grains in the powder metallurgy process can be effectively inhibited, and the grain size of the tantalum-based composite material is regulated and controlled. The engineering stress and deformation capacity of the tantalum-based composite material are remarkably improved in the high-temperature service process of the yttrium oxide particle reinforced tantalum-based composite material. According to the method, the content of yttrium oxide with different volume fractions can be accurately regulated and controlled in a large range. The yttrium oxide particle reinforced tantalum-based composite material prepared by the method has the advantages of fine crystal grains, inhibition of abnormal growth of the crystal grains, high engineering stress and high deformation elongation. The relative density gt of the yttrium oxide particle reinforced tantalum-based composite material; the tensile strength of the alloy is 100-650 MPa, the elongation is 98%, the room-temperature hardness is 1.6-2.1 GPa, the tensile strength is 100-650 MPa, and the ductility is 2%-27%.

The invention belongs to the field of metal materials, and provides a high-strength plastic magnesium alloy based on isothermal annealing under constant stress and a preparation method. The magnesium alloy is prepared from the following components in percentage by mass: 1.2 to 1.5 percent of Al, 0.2 to 0.4 percent of Ca, 0.5 to 0.8 percent of Gd, less than or equal to 0.05 percent of inevitable impurities and the balance of magnesium. The preparation method of the high-strength plastic magnesium alloy comprises the steps of casting, stepped homogenization treatment, hot extrusion, high-temperature solid solution treatment, rolling and isothermal annealing treatment under constant stress. Rapid recrystallization and texture weakening are achieved under the low-temperature and short-time conditions, a large number of high-thermal-stability nano Al-Gd and Al-Ca phases exist in the alloy, the strength is improved, meanwhile, the defects of uneven tissue, abnormal grain growth and the like caused by traditional high-temperature heat treatment are overcome, and the heat treatment cost is remarkably reduced. The finally obtained alloy has a weak texture which deflects in the rolling direction RD and the transverse direction TD, and the peak strength is smaller than or equal to 6.8 mrd. The recrystallization area fraction is larger than or equal to 63.8%, the average grain size is smaller than or equal to 7.7 micrometers, the tensile strength is larger than or equal to 234.6 MPa, the ductility is larger than or equal to 17.9%, and excellent strength and plasticity matching is achieved.

The present invention provides a method for preparing spherical α-Al2O3 nanoparticles, comprising the following steps: adding malic acid to an alcohol aluminum compound in a polar organic solvent, and drying to obtain an anhydrous aluminum gel; wherein the molar ratio of [AlO6] octahedron to [AlO4] tetrahedron in the anhydrous aluminum gel is 5.8-6:4-4.2; and calcining the anhydrous aluminum gel at 760-900°C to directly transform the γ-Al2O3 nanoparticles produced during the calcination into α-Al2O3 nanoparticles. The present invention aims to address the problem of abnormal grain growth that occurs during high-temperature calcination of α-Al2O3 nanoparticles by providing a method for preparing α-Al2O3 nanoparticles at low temperatures using an anhydrous sol-gel method, and to achieve effective regulation of grain morphology in the method.

The invention relates to the technical field of target materials, and provides a method for preparing a high-density PZTO target material through low-cost normal-pressure sintering, industrial-grade raw materials are adopted, and the cost is reduced by 50% compared with 99.99% of the raw materials; transition metal oxide Mn3O4 is doped, abnormal growth of crystal grains is inhibited, the mechanical strength is improved, and the hardness is larger than or equal to 8 GPa; water-based tape casting is adopted for forming, and pollution of methylbenzene and ethyl alcohol in a traditional process is avoided; sintering aids Bi2O3 and CuO are added in the sintering process to form liquid-phase sintering, and the sintering temperature is reduced to 1200 DEG C; three-stage sintering is adopted, a binder is removed in the first stage of sintering, preliminary densification is conducted in the second stage of sintering, and complete densification is conducted in the third stage of sintering; and the sintering waste is subjected to ball milling and crushing until the particle size is less than or equal to 1 mu m, and then is doped into new powder according to the proportion of 10%-20%, so that the raw material utilization rate is increased to 90%.

The application provides an aluminum alloy component and a hybrid manufacturing method, relates to the technical field of hybrid manufacturing, and comprises the following steps: solid-phase additive manufacturing is performed on an aluminum alloy raw material to obtain an additive component; plastic processing treatment is performed on the additive component to obtain the additive component after plastic processing treatment; and heat treatment is performed on the additive component after plastic processing treatment to obtain an aluminum alloy component; in the structure of the solid-phase additive component of the aluminum alloy, the grain size is small, and more grain boundary energy is stored; during solid solution heat treatment, abnormal grain growth is prone to occurring, mm-level grains appear in the structure, and the tensile property is harmed; strain energy is introduced into the additive structure through plastic processing treatment, so that recrystallization nucleation and growth are promoted during heat treatment, and the effect of limiting abnormal grain growth is achieved.

The invention provides a Fe-Mn-Al-Ni-based superelastic alloy and a preparation method thereof, and belongs to the technical field of iron-based superelastic alloys. The Co element is added, so that a gamma phase with high number density can be formed, after the gamma phase is heated to an alpha single-phase region, a sub-crystal structure with wide orientation distribution, high average orientation difference and number density is formed in alpha-phase crystal grains, abnormal growth of individual sub-crystals is caused, other sub-crystals in mother crystal grains are completely consumed by the sub-crystals which grow abnormally, and therefore the performance of the alloy is improved. A huge free energy gradient is formed between mother crystal grains and surrounding normal crystal grains with sub-crystals, so that a greater driving force is provided for the growth of abnormal crystal grains, and the growth process of the abnormal crystal grains is greatly shortened; by adding the Mo element, the width of the sub-grain low-density area can be increased, the time that the grain boundary crosses the sub-grain low-density area is prolonged, and therefore the number of abnormal grains is reduced, and the final size of the grains is increased.

This application belongs to the field of spin forming, and specifically discloses a high-temperature vacuum spin forming method and device for complex components of difficult-to-deform metals. The method specifically involves placing a split support internal mold inside the tube blank, then heating one end of the tube blank to the vacuum spin forming temperature in a vacuum environment and performing forward spin thinning forming. After reaching the forming requirements, stop. Finally, heat the other end of the tube blank to the vacuum spin forming temperature and perform reverse spin thinning forming. After reaching the forming requirements, stop. In this way, a complex component with inner ring ribs is manufactured, and an oxide layer is avoided from forming on the inner and outer surfaces of the complex component. This application can avoid the formation of an oxide layer on the inner and outer surfaces of the complex component with inner ring ribs. At the same time, the segmented spin forming can avoid the problem that the material undergoes abnormal grain growth due to being at high temperature for a long time, thereby affecting the mechanical properties. Moreover, the entire component can be formed in one heat treatment, the forming process is simple, and the mold loading and unloading are easy.

The invention discloses a single crystal tungsten (W) preparation method and device based on multi-physics field (force-heat-electricity) coupling, and the method comprises the following steps: (1) sample preparation: carrying out stress relief annealing on a deformed W plate, cutting the deformed W plate into a round sample, and cleaning and drying the round sample; (2) heat treatment: placing the sample in a graphite mold of a multi-physics field coupling device, regulating and controlling the working load, the heat treatment temperature and the current, and preparing a single crystal W in the sample; and (3) cutting: cutting the single crystal W in the obtained sample by adopting a linear cutting technology. According to the method, the abnormal growth behavior of the deformed W plate in the grain growth stage is strengthened through cooperation of a stress field generated by an external load, a temperature field generated by the thermal effect of current and a current field generated by a non-thermal effect, and the single crystal W with considerable size, low dislocation density, small sub-crystal number and small orientation difference among sub-grains can be obtained within the loading time of less than 20 min; and a brand-new method is provided for rapidly preparing the single crystal W with considerable size.

This invention belongs to the field of heat exchanger technology, specifically relating to a heat treatment enhancement method and system for heat exchangers. The invention employs a three-stage magnetic field design, applying specific types, parameters, and directions of magnetic fields at three key stages: 200-400℃, 600-900℃, and 900-1100℃. In the low-temperature stage, an alternating magnetic field at a 30-60° angle to the heat transfer path is used to uniformly eliminate residual stress. In the medium-temperature stage, a high-energy pulsed strong magnetic field drives dislocation movement and grain boundary migration. In the high-temperature stage, a uniformly rotating magnetic field achieves uniform distribution of the temperature and electromagnetic fields across the entire domain. This solves the problems of stress concentration, uneven recrystallization, and abnormal grain growth caused by the single direction of the magnetic field in traditional processes. It significantly optimizes the microstructure of the substrate and effectively improves the uniformity of the austenite structure and the grain refinement effect.

The invention belongs to the field of ceramic cutting tool materials, and particularly relates to a complex-phase Ti (C, N)-based ceramic material with a double-solid-solution microstructure and a preparation method of the complex-phase Ti (C, N)-based ceramic material. The prepared ceramic material is prepared by taking Ti (C, N) as a matrix and adding ZrC, NbC and Mo2C as reinforcing phases through spark plasma sintering. The addition of ZrC induces the formation of a (Ti, Zr, Nb) (C, N) second solid solution phase rich in Zr elements; the dispersed distribution of the (Ti, Zr, Nb) (C, N) second solid solution phase in the crystal and at the crystal boundary can effectively pinning the crystal boundary, inhibit the abnormal growth of the crystal grains in the sintering process, realize the spanning from a single solid solution to the multiphase ceramic, obviously improve the bending strength, hardness and wear resistance of the Ti (C, N)-based ceramic material, and greatly improve the service life of the ceramic material. And irreplaceable importance is shown in the fields of cutter materials, precision machining and the like.

The invention relates to a preparation method of a high-thermal-conductivity aluminum alloy for an energy storage battery pack, and belongs to the technical field of aluminum alloy production. The invention discloses a preparation method of a high-thermal-conductivity aluminum alloy for an energy storage battery pack. The preparation method comprises a component adjustment step, after component adjustment is completed, second-stage solid solution is carried out; aging treatment is carried out after the second-stage solid solution is completed; the component adjusting step specifically comprises the following steps: when the aluminum alloy is smelted, the temperature of a melt is 730-750 DEG C, the content of Fe is less than or equal to 0.15 wt%, the content of Cr reaches 0.05-0.10 wt%, and the content of rare earth reaches 0.05-0.15 wt%; according to the two-stage solid solution process, by accurately controlling the temperature and the time, sufficient solid solution of a second phase is guaranteed, meanwhile, abnormal growth of crystal grains and composition segregation are avoided, the purity and the structure uniformity of a matrix are improved, meanwhile, the process period is shortened, and the production efficiency is improved.