3048 results about "Crystallite" patented technology

The invention provides a preparation method of laser cladding heterostructure stainless steel. According to the method, dried stainless steel pre-alloyed powder is subjected to laser melting deposition to form heterostructure stainless steel alloy with cross deposition of coarse grains and fine grains; the grain size of the fine crystal is 3-6 [mu] m, and the structure of the fine crystal layer is an equiaxed structure; the grain size of the coarse crystal is 20-50 [mu] m, and the structure of the coarse crystal layer is a columnar crystal formed along the Z axis. According to the method, the specific coarse grain / fine grain cross deposition heterostructure is presented in the stainless steel by changing the deposition layer process parameters and the scanning path, the material strength is improved while the material ductility is guaranteed, and the alloy has the excellent mechanical property.

The invention relates to the technical field of hot galvanizing, and discloses an automobile hot galvanizing process parameter optimization method and system based on artificial intelligence, and the method comprises the steps: carrying out window division processing on initial cooling parameters, constructing a cooling rate matrix, and finely depicting heat exchange states of different cooling sections; the problem of insufficient cooling control precision under different cooling speed alternating conditions is solved, a microscopic image is combined to extract the grain main axis direction, calculate the mean value and range of included angles, generate a consistency index set and quantitatively describe the dispersion problem in the grain growth direction, the cooling speed and the consistency index are jointly matched, and a cooling speed structure offset matrix is constructed. The method comprises the following steps: identifying a space mutation region, accurately positioning abnormal coarse or abnormal arrangement positions of crystal grains, and finally screening target cooling parameters according to a cooling index value corresponding to an abnormal region to realize local adjustment of a cooling process, thereby reducing the abnormal growth rate of the crystal grains and improving the direction consistency of the crystal grains.

The invention discloses a Ti55531 titanium alloy large-specification bar machining method. The method comprises the steps of cogging forging, intermediate forging and finished product forging. In the cogging forging process, the cast ingot alternately deforms at the temperature above and below the phase transformation point temperature, and beta grains are refined through static and dynamic recrystallization; and during recrystallization heating in the beta region, the temperature is controlled to be 30-50 DEG C above the phase transformation point so as to avoid excessive growth of beta grains. In the intermediate blank forging stage, controllable recrystallization annealing is added, and by controlling the forging temperature (15-25 DEG C below the phase transformation point), a part of primary alpha phase is properly reserved to limit rapid growth of beta crystal grains; through 2-3 times of'low + high 'circular forging at 40-60 DEG C and 15-25 DEG C below the beta transformation temperature, and in combination with beta-phase deformation recrystallization, the original beta grain size is remarkably refined, and the forging structure uniformity of a subsequent two-phase region is improved. The method for producing the Ti55531 titanium alloy large-specification (phi 350-600 mm) bar is advanced in process, short in preparation process, low in cost, good in product structure uniformity and high in batch stability.

A method to achieve a yield ratio of 0.60 or more in a component from non-heat-treated steel having bainitic microstructure. The component includes a predetermined chemical composition, in mass %, in amounts such that a value of F1 obtained by Formula (1) is 0.65% or more, with the balance as Fe and inevitable impurity. Bainitic microstructure area fraction is 85% or more and Retained austenite area fraction is 5% or less. Crystal grains of the bainitic microstructure have an average diameter of 10 μm or more and 25 μm or less, an average aspect ratio of 0.5 or more, and an average ratio of crystal grain boundary length to crystal grain circumference of 60 or less.F⁢1=C+Si / 24+Mn / 6+Ni / 40+Cr / 5+Mo / 4+V / 14(1)

The invention relates to the technical field of mineral image recognition, in particular to a training method of a mineral selection recognition model based on multi-feature fusion. The method comprises the following steps: acquiring a mineral image; mineral crystal structure information of the mineral image is identified, geometric type division is carried out on the mineral crystal structure information, and mineral crystal system types are obtained; performing mineral crystal symbiosis identification on the mineral image according to the type of the mineral crystal system, evaluating a mineral crystal symbiosis relationship, and generating mineral crystal symbiosis data; mineral crystal grain connectivity analysis is conducted on the mineral crystal symbiosis data, and the mineral porosity is detected. Performing point-line-plane defect feature detection on the mineral image according to the mineral crystal system type to generate mineral point-line-plane defect features; according to the method, the ore selection recognition model is constructed through the multi-modal feature fusion technology, so that comprehensive recognition and analysis of the crystal structure, the symbiotic relationship, the morphological features and the surface abrasion of the minerals are achieved, and therefore the accuracy and efficiency of ore selection are improved.

The invention discloses a high-oxygen-storage zirconium solid solution material and a preparation method, and belongs to the technical field of rare earth catalytic materials, and the method comprises the following steps: precursor preparation, ultrasonic dispersion, double-gradient precipitation, ultrasonic aging, solid-liquid separation, three-section roasting and furnace cooling. Through the synergistic effect of double-gradient precipitation and ultrasonic aging, coarse grains and non-uniform particle size distribution are avoided, and the material is not prone to abnormal growth of the grains and structural collapse in long-term high-temperature service. Meanwhile, according to the gradient roasting process, through step-by-step regulation and control of crystal densification and crystal lattice reconstruction, separation of a fluorite phase and a pyrochlore phase easily occurring in traditional low-temperature single-section roasting is reduced, a stable crystal phase structure is maintained, it is ensured that the material can still keep sufficient active surface and pore channel structures under the working conditions of high temperature and thermal shock alternation, and the performance of the material is improved. The oxygen storage capacity and the long-term durability of the catalyst carrier are obviously improved.

The invention relates to the technical field of additive manufacturing, and discloses an additive manufacturing hot-crack-free precipitation strengthening high-temperature alloy and a preparation method thereof.The method comprises the steps that a laying layer is divided into a plurality of parallel scanning strips according to the preset translation direction and the scanning strip interval, strip type scanning is conducted in a laser autorotation and translation motion coupling mode, and the high-temperature alloy is obtained; molten pool disturbance is remarkably enhanced, periodic shear fracture of the tip of dendritic crystal is achieved, epitaxial growth of columnar crystal is broken, grain equiaxalization is achieved, and anisotropy is weakened; in addition, laser scanning is a high-speed scanning strategy with the translation speed larger than or equal to 1500 mm / s, a shallow molten pool is formed through regulation and control of the high scanning speed, surface tension in the shallow molten pool is utilized, convection in the molten pool is enhanced, dendritic crystals are refined, columnar crystals in the high-temperature alloy are further reduced, and anisotropy of mechanical properties is remarkably eliminated; and the transverse strength and creep resistance at high temperature are improved. The isometric crystals can effectively prevent cracks from expanding in the orientation direction of the columnar crystals, and the fatigue life and the damage tolerance are remarkably prolonged.

The invention is applicable to the field of photovoltaic technology, and provides a solar cell, a cell module and a photovoltaic system, the solar cell comprises a silicon substrate, the silicon substrate comprises a first area and a second area, a P-type polycrystalline silicon layer is arranged in the first area, and an N-type polycrystalline silicon layer is arranged in the second area; the P-type polycrystalline silicon layer comprises a plurality of P-type crystal grains, a first crystal boundary is arranged between adjacent P-type crystal grains, the N-type polycrystalline silicon layer comprises a plurality of N-type crystal grains, a second crystal boundary is arranged between adjacent N-type crystal grains, and the width of the first crystal boundary is smaller than that of the second crystal boundary. According to the invention, recombination of holes at the grain boundary is reduced, the transmission efficiency of electrons is enhanced, the photoelectric conversion efficiency of the solar cell is improved, the overall stress of the silicon wafer is more balanced, the bending possibility of the silicon wafer is reduced, and the manufacturing yield of the solar cell is finally improved.

An additive manufacturing method based on micro-selective laser melting technology. By using a spot size of 30 μm or less, a metal powder layer thickness of 10 μm or less and ultrafine metal powders having a D90 particle size of 30 μm or less, and in combination with the control of a scanning laser power, a scanning rate, a linear energy density and a volumetric energy density within specific ranges, the method can print complex-structured metal parts having extremely high resolutions and surface smoothness, and can obtain a high-density internal structure of a component even under a relatively low energy density or power condition, thereby effectively protecting an optical system. Moreover, a printed component exhibits a defect-free microstructure, and has excellent electrical properties, thermal properties and mechanical properties. Particularly, ultrafine grains and a high dislocation density provide superior mechanical properties compared to conventional manufacturing materials. An infrared laser device can be used, thereby achieving low costs.

The invention relates to the technical field of glass, in particular to microcrystalline glass and a preparation method thereof, reinforced microcrystalline glass and a preparation method thereof, and a glass product. The invention provides microcrystalline glass which comprises the following components in percentage by mass based on the total mass of 100%: 58.21-70.63% of SiO2; the content of Al2O3 is 6.46 to 7.83 percent; zrO2: 3.23% to 3.92%; 1.86%-2.3% of P2O5 (P2O5); 0.4 to 0.5 percent of B2O3; 1.9 to 14.4% of a rare earth metal oxide; an alkali metal oxide: 10.86 to 12.99%; wherein the rare earth metal oxide is prepared from Y2O3 and La2O3; the alkali metal oxide comprises Na2O and Li2O. According to the microcrystalline glass disclosed by the invention, the link of a glass network is enhanced by utilizing the rare earth metal oxide and Al2O3 together to form a high-density network structure, uniform nucleation is induced through the nucleating agent, fine grains are generated, grain boundary defects are reduced according to a multi-step nucleation-crystallization system, and the mechanical property is remarkably improved.

The invention discloses a method for automatically evaluating the average grain size of a metal material by using a cross-point method, and relates to the field of metal material metallographic image analysis, and the method comprises the following steps: selecting an identification model according to a tested material; inputting the optical microscope image pic into a system with an identification model; extracting scale information of the input image pic by using mask extraction and Hough straight line detection: firstly extracting a scale region by using a mask, then extracting a scale length by using a Hough straight line detection algorithm, and finally extracting a scale value by using a KNN classifier; and identifying the grain boundary pixels of the input image by using the selected identification model: classifying each pixel of the input optical microscope image pic by using UNet, judging whether the pixel is the grain boundary pixel, finally performing optimization, performing intercept method rating according to the optimized grain boundary image, counting the number of intersections per unit length, and calculating the grain size G. According to the method, the precision and consistency of grain size evaluation are remarkably improved.

The invention discloses a method for estimating the boundary shear stress of a salt rock single crystal sliding face, belongs to the technical field of geotechnical engineering mechanics and material mechanics, and establishes a frame capable of directly estimating the boundary shear stress of the salt rock single crystal sliding face based on the Hall-Pearch theory. The mapping from the measurable macromechanical parameters to the boundary shear stress of the microcosmic single crystal slippage surface is realized. The method only needs conventional cold pressing preparation, EBSD grain size data and uniaxial compression test results, and does not need to depend on high-cost FIB microcolumn compression or in-situ nanoindentation tests. The method can provide more accurate material mechanical parameters for salt cavern design, creep stability analysis and underground engineering safety evaluation, and has good engineering applicability and wide engineering application prospects.

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 discloses a spinning forming dislocation evolution prediction and process optimization method based on multi-scale modeling, which combines three calculation methods with different scales and levels, namely macroscopic finite element simulation, microcosmic crystal plasticity simulation and microcosmic dislocation dynamics simulation. A complete perspective from macroscopic mechanical behaviors to microscale mechanical response and dislocation density evolution and then to microscale single dislocation motion and interaction mechanism can be provided, so that the plastic forming process of the metal material can be understood more comprehensively. Not only are the prediction precision and reliability improved, but also the understanding depth of the material deformation behavior and the influence factors thereof is enhanced. By integrating information of different scales, key characteristics such as macroscopic stress, strain distribution, grain deformation response, dislocation density evolution and movement and interaction of a single dislocation of the material in the plastic forming process can be predicted more accurately. Meanwhile, in combination with multi-scale simulation, process parameters can be optimized to obtain better forming quality and performance.

The invention discloses a VPSC model construction method based on an ABAQUS sub-model, and belongs to the field of computational material science and engineering.The VPSC model construction method comprises the steps that a global model is established according to the size of a part, and an ABAQUS input file is generated; selecting a local area of a part in the global model, determining a unit number of the area, constructing a crystal plasticity constitutive model through UMAT, and adding a plurality of randomly oriented crystal grains to the local area in an ABAQUS input file to form a reference model; grain nodes and orientation information in the reference model are read through an ABAQUS script, a grain model is created, corresponding orientation is given to sub-models, sub-model boundary conditions consistent with global model deformation are applied to grain geometric boundaries, and a VPSC model is constructed. According to the method, the grain orientation is locally refined through the sub-model technology, and the VPSC sub-model is automatically generated in combination with the script, so that the calculation complexity is remarkably reduced.

The invention discloses a material deformation collaborative acquisition test method, device and equipment and a storage medium, and relates to the technical field of material testing, and the method comprises the following steps: carrying out EBSD calibration on the sample surface of a to-be-tested sample; preparing speckles on the surface of the sample and carrying out in-situ loading so as to carry out DIC determination; removing speckles on the target to-be-tested sample, and returning to execute the step of EBSD calibration based on the to-be-tested sample after speckle removal until in-situ loading of the target to-be-tested sample reaches a preset loading target; and determining an EBSD test result and a DIC test result based on the obtained measurement results of the internal grain orientation information and the material strain information of each sample to be tested. The method does not need to consider the influence of DIC on EBSD calibration, breaks through the limitation of the electron beam on the size of speckle particles or the size of a DIC observation area in EBSD calibration, and improves the test efficiency of material deformation collaborative collection.

The invention discloses a preparation method of a nano HZSM-5 molecular sieve, and belongs to the technical field of nano molecular sieve preparation, the preparation method comprises the following steps: 1, adding a silicon source, an aluminum source and a template agent into a supercritical crystallization reaction kettle, heating, stirring, and carrying out a melting reaction on the raw materials to obtain a seed crystal mixed material; introducing absolute ethyl alcohol into the seed crystal mixed material obtained by the melting reaction, heating, stirring, and carrying out crystallization reaction to obtain a reaction product; and cooling, washing, drying and roasting the obtained reaction product to obtain the nano HZSM-5 molecular sieve. According to the present invention, the melting reaction and the supercritical ethanol crystallization reaction technology are introduced into the preparation of the nanometer HZSM-5 molecular sieve for the first time, and the prepared nanometer HZSM-5 molecular sieve has advantages of small grain size, uniform distribution, large specific surface area and high yield.

The invention relates to the technical field of vacuum physical vapor deposition, and provides a preparation method of a porous structure low-density IWO evaporation target material based on current calcination, which comprises the following steps: firstly, carrying out current calcination on raw materials, promoting WO3 crystal grains to preferentially grow along the 111 crystal orientation by utilizing a Joule effect, forming a long-range ordered structure, increasing the density after calcination, and then crushing to retain the crystal form, so as to obtain the low-density IWO evaporation target material with the porous structure. The preparation method comprises the following steps of: adding a 15wt% PVA ethanol solution, then carrying out ball-milling cold isostatic pressing molding, then carrying out distributed sintering, volatilizing PVA to form a porous framework through first-step sintering, carrying out second-step sintering to obtain crystal grains with a continuous porous structure, and finally carrying out RPD film coating under specific parameters, so that the powder falling rate is reduced, and the TCO film is good in uniformity; through the processes of current calcination, crushing, binder forming and sintering, on the premise that the low density of the target material is kept, cooperative control over directional connection of a porous structure and crystals is achieved, the powder falling rate is reduced by 60%, the regular porous structure and ordered crystal arrangement effectively disperse thermal stress, and structural collapse is avoided; the evaporation stability is improved, and the surface roughness is reduced to Ralt; the evaporation rate fluctuates by + / -5%, and the film uniformity reaches + / -2.0%.

The invention relates to the technical field of softened water treatment devices, in particular to an induced crystallization granulation fluidized bed softened water treatment device. Comprising a cylinder, a stainless steel cathode layer is arranged on the inner side of the cylinder, the stainless steel cathode layer is electrically connected with a negative electrode of a power supply, an excitation system is mounted on the cylinder, a vertical vibration frame capable of vertically reciprocating is connected to the excitation system, a translation frame is slidably connected to the vertical vibration frame, and a synchronizing system for driving the vertical vibration frame and the translation frame to synchronously displace is arranged on the vertical vibration frame. The synchronous system is in transmission connection with a transmission shaft capable of alternately rotating forwards and backwards, a micro-filtration cylinder is rotationally mounted on the translation frame, an insulating shaft is rotationally mounted in the micro-filtration cylinder, the micro-filtration cylinder and the insulating shaft are driven by the transmission shaft, a plurality of guide rings are mounted on the micro-filtration cylinder, and an anode bar slides on the insulating shaft. According to the device, grain fluidization is strengthened through synchronous multi-dimensional excitation, the problem of local reaction dead angles is solved, the problems that a traditional device is low in crystallization efficiency and uneven in particle size are effectively solved, and the stability of grain settling separation is guaranteed.

The invention discloses a heat-resistant aluminum alloy material and a preparation method and application thereof, and belongs to the technical field of additive manufacturing aluminum alloy materials. The heat-resistant aluminum alloy material comprises the following components in percentage by mass: 0.5-6% of Fe, 0.5-6% of Cr, 0.5-3% of Ti, less than or equal to 2% but not equal to 0 of Mn, less than or equal to 2% but not equal to 0 of Sc, less than or equal to 2% but not equal to 0 of Zr and the balance of Al and inevitable impurities. By optimizing the component proportion, the preparation method and the like, in the microstructure of the heat-resistant aluminum alloy material, the interior of the heat-resistant aluminum alloy material is of a bimodal grain structure, the boundary of a molten pool is mainly isometric crystals, the center of the molten pool is columnar crystals, and an icosahedron nanometer quasi-crystal phase and an intermetallic compound strengthening phase are further distributed on the boundary of the molten pool and the center of the molten pool in a dispersed mode; the problems that when a traditional aluminum alloy material is used for additive manufacturing forming, hot cracks or macroscopic cracks occur, and the mechanical property of a formed product is poor are fundamentally solved.

Some implementations herein provide an optical signal redirection structure. The optical signal redirection structure includes a planar silicon surface having a <110> crystal grain orientation. The optical signal redirection structure includes a dielectric region over the planar silicon surface. The optical signal redirection structure includes a mirror structure suspended in the dielectric region, where the mirror structure is approximately parallel to the planar silicon surface.

The invention relates to a preparation method of an etching-resistant and wear-resistant Y2O3-AlxOy composite coating. The preparation method comprises the following steps: carrying out ultrasonic cleaning on a corrosion-resistant matrix; performing plasma bombardment cleaning activation on the surface of the corrosion-resistant matrix; a Y2O3 coating and an AlxOy coating are alternately deposited on a corrosion-resistant base body in a double-target magnetron sputtering mode to form the Y2O3-AlxOy composite coating, the sputtering power of a Y target is larger than that of an Al target, and the ratio of x to y in the AlxOy coating is larger than 1. According to the method, the amorphous AlxOy coating dominated by the metal state is introduced into the Y2O3 coating, growth of Y2O3 columnar crystals is continuously broken, crystal grains are refined, formation of intergranular easy-to-etch point locations is inhibited, and an yttrium aluminum oxide composite strengthening phase is formed at an interface, so that plasma etching resistance is improved; the thickness of a single-layer coating in the composite coating is very thin; under the action of growth stress, the structure of the coating presents a wave-shaped microstructure and a soft and hard alternate mechanical structure, and the soft and hard alternate mechanical structure is beneficial to inhibiting generation of transverse cracks, guiding friction crack level expansion, prolonging the friction life of the coating and reducing the wear rate.

The invention relates to an aluminum alloy strengthening method for high-frequency pulse nanosecond laser surface remelting after low-temperature rolling, which comprises the following steps: firstly, carrying out low-temperature rolling deformation treatment on an aluminum alloy plate to obtain an aluminum alloy material with a high dislocation density fiber structure and realize deformation strengthening; afterwards, the surface of the aluminum alloy plate is subjected to high-frequency pulse nanosecond laser remelting treatment, the aluminum alloy plate is rapidly melted by means of the characteristics of high instantaneous energy density, short acting time and the like of high-frequency pulse nanosecond laser, a small molten pool is obtained, the small molten pool has the great supercooling degree, the driving force of crystallization is increased, and ultra-rapid solidification is achieved; and submicron equiaxed crystals with the grain size ranging from 0.55 micrometer to 0.7 micrometer are obtained on the surface of the aluminum alloy, and fine grain strengthening of the surface is achieved. Through the low-temperature rolling and laser remelting processes, the aluminum alloy material with the special structure is prepared, the interior of the aluminum alloy material is of a hardened state high dislocation density structure, and the surface layer of the aluminum alloy material is of a submicron equiaxed structure.

The invention relates to the technical field of material analysis, in particular to a crystal plasticity finite element modeling method, a crystal plasticity finite element modeling device, a storage medium and electronic equipment. The crystal plasticity finite element modeling method comprises the following steps: collecting grain information of a given material sample; performing crystal grain division based on the crystal grain information to obtain a crystal grain data file, and determining grid parameters based on a crystal grain with a minimum crystal grain morphology area in the crystal grain information; creating a grain geometric model according to the grain data file, creating a grid model according to the grid parameters, and mapping the grain geometric model to the grid model to obtain a crystal plasticity finite element grid model; and endowing a boundary condition and a constitutive relation to the crystal plasticity finite element mesh model so as to realize crystal plasticity finite element simulation. According to the crystal plasticity finite element modeling method provided by the invention, the modeling calculation efficiency can be improved while the model precision is ensured.

The invention belongs to the technical field of photovoltaic solar materials, and particularly relates to a high-conversion-efficiency perovskite precursor material and a preparation method thereof. The high-conversion-efficiency perovskite precursor material is composed of phenyl ammonium cesium composite cations, metal halide, an additive, a nuclear auxiliary agent and a solvent. By compounding phenylethyl ammonium iodide and cesium iodide, phenylammonium and cesium cations are introduced into perovskite crystal lattices, organic-inorganic balance of the material is optimized, phenylammonium promotes formation of a quasi-two-dimensional structure, and damp-heat stability is enhanced; cesium ions fill A-site gaps, so that crystal lattices are tighter, and the thermal stability and the photoelectric conversion efficiency are improved; the synergistic matching addition of the metal halide realizes band gap regulation and control and spectrum matching, and quaternary ammonium salt adjusts nucleation and grain growth, so that a uniform film structure is ensured, and defects are reduced; and guanidine salt passivates defects after crystal growth, stabilizes crystal lattices, and improves charge life and device efficiency.

A lithium ion battery polycrystal / single crystal positive electrode material multi-physics field coupling modeling and failure analysis method comprises the steps that a three-dimensional positive electrode particle structure model is constructed, a polycrystal structure is generated by randomly filling spherical boundaries with non-overlapped spherical crystal grains, and single crystals are complete spheres; importing the model into a finite element simulation platform, and setting a multi-physics field coupling interface; establishing a diffusion, migration and electrochemical reaction kinetic model; establishing a lithium concentration-strain-stress coupling relation and solving the lithium concentration-strain-stress coupling relation; setting a failure criterion based on stress distribution to identify a damaged area; and outputting a simulation result and carrying out structure-performance correlation analysis. The method can reveal the evolution behavior difference of the polycrystalline positive electrode and the monocrystalline positive electrode in the electrochemical-mechanical process, provides reliable theoretical and simulation support for electrode material design, optimization and life evaluation, and provides powerful technical support for optimization design of the high-performance lithium ion battery positive electrode material.

The invention discloses a manufacturing method of a high-precision intelligent instrument measuring chip and a related device. The method comprises the following steps: firstly, performing multi-stage vacuum annealing and atomic layer reduction corrosion removal on lower-layer copper interconnection, introducing thermal-electric synergistic stress to convert a vacancy-rich layer into < 111 > preferred grains, and obtaining a bonding preparation surface with consistent crystal orientation; and then low-temperature copper-copper thermocompression bonding is completed in a controlled inert atmosphere, and interconnection initial thermoelectric force is intercepted in real time. The method comprises the following steps: establishing a vertical heat flow according to a space mapping power consumption sequence by driving an upper-layer functional region, collecting an interface voltage response, and extracting an interconnection Seebeck deviation through time sequence registration and differential processing; and according to a deviation result, synchronous fusing and parallel connection are implemented by using a programmable metal section of the rewiring layer, a thermoelectric balance interconnection network is constructed, and a zero drift calibration value is written in. According to the scheme, direction-dependent thermoelectromotive force is eliminated in a closed mode on the three levels of material, measurement and interconnection reconstruction, and therefore long-term zero drift stability of a measurement chain is guaranteed under the nanovolt-level noise condition.

The invention discloses a welding thermal stress simulation method, device, equipment and medium based on a crystal plasticity finite element, and relates to the technical field of welding thermal stress finite element simulation. The method comprises the steps that a sample is prepared according to a specific multi-phase metal material, and phase distribution and crystal orientation information of a two-dimensional plane of the material are obtained through a metallographic experiment; and a three-dimensional multi-grain model is constructed based on the two-dimensional information. According to the method, a crystal plastic constitutive model is adopted to describe the flowing behavior of the material at high temperature, crystal slippage and polycrystal interaction are considered, the influence on the material performance is reflected from the microstructure evolution level, and the problem that the influence on the macroscopic mechanical performance of a microstructure is difficult to capture in welding multiphase metal material simulation is solved; two-dimensional representation is obtained through a metallographic experiment, the Young modulus and rigidity matrix parameters are accurately calculated by combining forward stretching and shear simulation, the rigidity matrix precision is improved, a temperature field area is divided, stress evolution and residual stress are calculated by combining a thermal-elastic-plastic model, and the welding thermal stress calculation precision is improved.

The invention relates to a copper foil and a preparation method and application thereof, the copper foil comprises an electrolytic copper foil layer and secondary long copper layers located on the surfaces of the two sides of the electrolytic copper foil layer, the maximum Feret diameter average value of crystal grains of the secondary long copper layers is 2.5-3 microns, and the maximum Feret diameter average value of crystal grains of the electrolytic copper foil layer is 1-2 microns. The maximum Feret diameter average value of grains of the secondary growing copper layer on the surface of the copper foil is 2.3-3 microns, the maximum Feret diameter average value of grains of the internal electrolytic copper foil layer is 1-2 microns, a structure with the grain size of the surface layer being large and the grain size of the inner layer being small is formed, and when the copper foil is used for transmitting a high-speed high-frequency electric signal, due to the skin effect of current, the high-speed high-frequency electric signal can be transmitted. More electric signals are transmitted along the surface layer of the copper foil, the grain size of the surface layer is large, the grain boundary is correspondingly reduced, and the obstruction to current is reduced, so that the loss of the electric signals is reduced, and the transmission integrity of the electric signals is improved.

The invention discloses an evolution simulation method and system for uranium dioxide heavy structure behaviors, and relates to the technical field of crystal evolution, and the method comprises the following steps: in a current time step, solving a pore-containing polycrystalline system evolution phase field model to obtain a vacancy concentration field variable and a grain orientation sequence parameter of the current time step; correcting the pore migration speed through the temperature distribution of the next time step; correcting grain orientation sequence parameters of the different air holes based on grain orientation and generation positions of columnar crystals generated by the different air holes; iteration is carried out on the next time step based on the corrected pore migration speed and grain orientation sequence parameters; and carrying out visualization processing on the vacancy concentration field variable and the grain orientation sequence parameter after iteration is finished to obtain the morphology evolution process of the pores and the grains in the uranium dioxide heavy structure process. According to the invention, a columnar crystal generation mechanism in a uranium dioxide heavy structure process is reflected, and simulation of an evolution process of generating columnar crystals with different orientations by migration of one or more pores is realized.