540 results about "Grain structure" patented technology

The invention relates to the technical field of mechanical property analysis, in particular to an inorganic mineral casting stress analysis method and system based on a virtual simulation system.The method comprises the following steps that grain voxel density difference is obtained, boundary points are screened, a boundary curve data set is generated, a defect appearance is formed through fitting, and a defect area grid model is constructed; and extracting a fatigue path node distribution diagram, screening thermal collaborative risk nodes, and drawing a concentrated stress area labeling result. According to the method, the density mutation feature is introduced as an identification basis when the grain structure boundary is obtained, boundary offset caused by traditional geometric approximation modeling is avoided, the closed curve network is established through boundary point space continuous connection, the refining degree of grain structure modeling is improved, and the modeling precision is improved. For a fatigue path calibration link, a continuous change relation of a node displacement trend is adopted to replace concentrated strain point acquisition, so that fatigue path identification is independent of single-point measurement, and the stress judgment integrity of a virtual simulation system under a multi-field condition is enhanced.

The invention relates to the technical field of additive manufacturing, and particularly provides a heat treatment method of a nickel-based superalloy for additive manufacturing. The heat treatment method comprises the following steps: S1, preparing a nickel-based high-temperature alloy forming part by adopting a selective laser melting process; s2, the formed part is subjected to homogenizing annealing treatment at the temperature ranging from 1000 DEG C to 1200 DEG C; s3, the formed part subjected to homogenizing annealing treatment is subjected to water quenching treatment and cooled to the room temperature; and S4, the formed part subjected to water quenching treatment is subjected to primary aging treatment at the temperature of 700-800 DEG C, then cooled to 600-700 DEG C, subjected to secondary aging treatment and then air-cooled to the room temperature. According to the method, the effect of simultaneously regulating and controlling the grain structure and the precipitated phase of the SLM-GH4169 alloy is achieved by increasing the homogenizing annealing heat treatment time, combining a water quenching cooling mode and cooperating with two-stage aging, and the strength and plasticity of the alloy are successfully and synergistically improved. According to the prepared SLM-GH4169 alloy, not only can the tensile strength reach 1400 MPa, but also the elongation at break can reach 22% or above.

The invention belongs to the technical field of aluminum processing, and particularly discloses a method for producing a 1235 alloy cable aluminum foil by using a continuous casting and rolling blank, which comprises the following steps of: rolling the blank by a three-stand continuous rolling mill without cooling and surface milling, performing cold rolling, trimming and intermediate annealing, and performing multi-pass rolling by an aluminum foil rolling mill until the thickness of a finished product is reached, thereby obtaining the 1235 alloy cable aluminum foil. The processing flow is shortened, the metal manufacturing time is shortened, the energy consumption is reduced, after the aluminum foil finished product produced by the continuous casting and rolling blank is annealed, the mechanical property can be stably controlled within the tensile strength of 70-90 MPa, the performance of the finished product is more stable than that of a material produced by a cast rolling method, and the grain structure of the finished product is finer and more uniform than that of the material produced by the cast rolling method.

The invention relates to the technical field of aluminum alloy wire processing, and particularly discloses a high-modulus high-conductivity heat-resistant aluminum alloy material, an aluminum wire, a preparation method and a power transmission cable. According to the high-modulus, high-conductivity and heat-resistant aluminum alloy material provided by the invention, the nanoscale TiB2 particles and the micron-sized SiC particles are compounded in the aluminum alloy powder, a dual-reinforcement system is constructed, and the mechanical property and the electrical property of an aluminum conductor are synergistically improved. The invention further provides a preparation method of the high-modulus and high-conductivity heat-resistant aluminum conductor. According to the process, a multi-stage coupling plastic processing technology of hot extrusion, continuous rolling, drawing and surface treatment is adopted. The grain structure is refined through the dynamic recrystallization effect in the series of machining processes, oxidation film defects on the surface and in the structure are damaged through plastic deformation, the rigidity and the conductivity of the aluminum wire are further optimized, and the technical bottleneck that high modulus, high conductivity and heat resistance of traditional aluminum alloy are difficult to consider at the same time is effectively solved.

The present invention belongs to the technical field of aluminum processing, and specifically discloses a method for producing 1235 alloy cable aluminum foil by using continuous casting and rolling billets. The billets are rolled on a three-stand continuous rolling mill without undergoing cooling and milling, and then, after cold rolling, trimming and intermediate annealing, are rolled in multiple passes on an aluminum foil rolling mill to the thickness of the finished product. Finally, slitting, annealing and packaging are completed, thereby shortening the processing flow, reducing the metal production time and lowering energy consumption. After annealing, the finished aluminum foil produced by the continuous casting and rolling billets of the present invention can stably control the mechanical properties within a tensile strength range of 70 to 90 MPa. The performance of the finished product is more stable than that of materials produced by the casting and rolling method, and the grain structure of the finished product is finer and more uniform than that of materials produced by the casting and rolling method.

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.

The invention provides a method for improving the high-temperature crack resistance of a cupronickel alloy based on addition of an alterant, which comprises the following steps: S1, heating a cupronickel alloy raw material until the cupronickel alloy raw material is completely molten; s2, scum in the metal solution is fished out; s3, adding a copper-magnesium alloy; s4, adding pure titanium, and fully melting and reacting the pure titanium through stirring; s5, scum in the metal solution is fished out; s6, casting after the furnace front analysis is qualified; s7, obtaining a cupronickel alloy round ingot or flat ingot; the copper-magnesium alloy is added as a deoxidizing agent, so that the oxygen content of a metal solution can be reduced, oxygen is prevented from reacting with alloy elements to generate inclusions, the purity of the alloy is improved, and the crack resistance of the alloy is enhanced; the fine and uniform grain structure can effectively improve the high-temperature plasticity of the cupronickel alloy, reduce grain boundary defects, improve the high-temperature crack resistance of the cupronickel alloy and avoid cracking under high-temperature forging or hot rolling.

The invention relates to a preparation process optimization method of a zirconium alloy material with high fretting wear resistance, which comprises the following steps: setting a chemical component optimization range of a zirconium alloy, including specific proportions of tin, iron, niobium, chromium and oxygen elements; establishing a computer simulation model, and predicting the wear volume, tribological stability and microstructure evolution of the material under the fretting wear condition; then, a complete optimization scheme is output based on the model optimization homogenization treatment temperature interval, the hot working deformation range, the cold working cumulative deformation degree and the annealing system; and finally, a preparation process sequence including smelting, homogenization treatment, hot working deformation, cold working deformation and final heat treatment is implemented, the zirconium alloy material with the equiaxed grain structure is prepared, and the wear resistance of the zirconium alloy material is verified through an experimental fretting wear performance test. Compared with the prior art, the method has the advantages that through systematic component design and process parameter simulation optimization, the material performance is remarkably improved, and the application reliability is enhanced.

Methods, devices and systems are described for improving the manufacturing of components, devices, and materials. The described technique can predict microstructures including defects, such as cracks, porosity, undesirable phases, or non-optimal grain structures, segregations, and dendrite structures of alloys and superalloys manufactured by additive manufacturing, such as three-dimensional (3D) printing including laser powder bed fusion (LPBF) and laser melting deposition (LMD). Example alloys and superalloys include Rene 65, IN625, Mar-M-247, CM247LC, Rene 108, IN738, Ti-6Al-4V, AlSi10Mg, or IN718.

The invention relates to the technical field of aluminum alloy forging, in particular to a forging process capable of reducing reverse forging coarse grains of 6061 aluminum alloy, which comprises the following steps: acquiring a 6061 aluminum alloy ingot, homogenizing and annealing the 6061 aluminum alloy ingot at 480-520 DEG C for 12-16 hours, cooling to room temperature by water, performing ultrasonic flaw detection, performing turning surface treatment, and alternately forging and pressing in three directions, thereby obtaining the 6061 aluminum alloy. The method comprises the following steps: placing a fine-grain 6061 aluminum alloy forge piece in a graded heating furnace, completing sub-dynamic recrystallization, applying directional pressure stress of 50-80MPa to the 6061 aluminum alloy forge piece, analyzing grain boundary characteristic distribution by adopting an electron back scattering diffraction technology, and obtaining the grain boundary optimized 6061 aluminum alloy forge piece with a discontinuous coarse-grain structure through laser shock strengthening and stress relief annealing. According to the method, the problems that reverse forging coarse grains are caused by uneven strain distribution during forging and pressing, and fine grains and high-density nanoprecipitation cannot be effectively obtained and a grain boundary structure cannot be optimized due to the fact that follow-up forging, heat treatment and stress treatment parameters are difficult to accurately control can be solved.

The invention relates to the technical field of metal material surface strengthening, in particular to a TC4 titanium alloy surface gradient nanostructure construction method based on high-temperature ultrasonic rolling, which comprises the following steps: constructing a thickness-controllable gradient nanostructure layer on a TC4 titanium alloy surface through a thermal-mechanical coupling effect, refining surface grains to be less than 100nm, forming submicron transition grains on a subsurface layer, and forming a gradient nanostructure on the surface of the TC4 titanium alloy. And the core part retains a coarse grain structure. According to the method, the fatigue resistance, fretting fatigue resistance and high-temperature creep resistance of the TC4 titanium alloy can be remarkably improved, meanwhile, the equipment cost and energy consumption are reduced, and the method is suitable for aero-engine manufacturing and overhaul environments and has the high industrialization advantage.

The invention discloses a welded joint treatment method based on laser remelting and ultrasonic shot peening synergistic strengthening, and relates to the technical field of additive manufacturing. An optical fiber laser is adopted for conducting remelting treatment on the welding seam, the laser power ranges from 800 W to 1500 W, the scanning speed ranges from 0.5 m / min to 2 m / min, the light spot diameter ranges from 0.5 mm to 2 mm, microdefects are eliminated, and grains are refined; and then surface impact strengthening is conducted on the remelting area through ultrasonic shot peening equipment, the diameter of a shot ranges from 0.8 mm to 2 mm, the frequency ranges from 20 kHz to 40 kHz, the amplitude ranges from 30 micrometers to 80 micrometers, and a gradient pressure stress layer is formed. According to the method, through the alternating effect of ultra-fast laser low-heat input remelting and gradient particle size bullet impact, a nanocrystalline layer is formed on the surface layer of the material, the microhardness is improved, meanwhile, an ultra-fine grain structure is reserved in a transition area, gradient performance matching of hard outside and tough inside is achieved, and the method is particularly suitable for high-performance manufacturing of high-strength aluminum alloy (such as 7075-T6 and 2024-T3) welding components for aerospace.

The invention discloses a high-Al and Ti difficult-to-deform high-temperature alloy hot working method, which avoids the melting risk of low-melting-point intermetallic compounds through high-temperature diffusion on one hand, and can realize effective and uniform diffusion of chemical elements on the other hand; on the other hand, through gradual heating number cooling forging, a high-temperature small-deformation forging process is carried out in an as-cast structure interval, and a low-temperature large-deformation process is adopted after the as-cast structure is crushed, so that an ideal uniform and fine recrystallized grain structure is finally realized, and the problems of high possibility of cracking, non-uniform forging structure, coarse grains and the like in a high-temperature alloy forging process are solved; and the high-quality requirement for use of downstream aero-engine components is met.

The invention relates to the technical field of ceramic materials, in particular to a preparation method of a zirconium oxide toughened aluminum oxide ceramic substrate, which comprises the following steps: 1, pretreating a powder material; step 2, preparing slurry; step 3, tape casting; step 4, stamping and forming; and 5, sintering. Before the slurry is prepared, the aluminum oxide powder and the zirconium oxide powder are uniformly mixed and then subjected to plasma treatment, so that the surface activity of the mixed powder of the aluminum oxide and the zirconium oxide is improved, the grain structure of the mixed powder of the aluminum oxide and the zirconium oxide is changed, and the toughening effect of the zirconium oxide on the aluminum oxide ceramic substrate is improved.

The invention relates to the technical field of high-speed cable shielding materials, and discloses a manufacturing method of rolled copper foil for high-speed cable shielding. The method comprises the following steps: preparing a copper plate; performing multi-pass cold rolling on the copper plate to form an elongated grain structure oriented along the rolling direction; performing controlled annealing on the cold-rolled copper foil to recover plasticity and inhibit complete recrystallization; the target thickness is obtained through finish rolling; carrying out finishing rolling on at least one surface of the copper foil by adopting a mirror surface working roller so as to reduce the surface roughness; and performing surface smoothing or passivating treatment to inhibit oxidation and performance degradation. Therefore, the obtained rolled copper foil has good ductility, structural stability and high-frequency performance.

The invention discloses a modeling method for a transition area microstructure of a dual-performance turbine disc of an aero-engine. The method comprises the following steps: carrying out EBSD analysis and post-treatment on a microstructure of a transition region to obtain the area ratio and orientation distribution of a coarse grain structure and a fine grain structure in the transition region; open source Dream.3D software is used for inputting orientation distribution and corresponding area proportions of all the parts in a program control coarse grain part and a program control fine grain part respectively, and meanwhile by inputting strengthening phase structure size distribution and the area proportions, corresponding strengthening phases can be inserted in grain boundary parts; and a Python script is operated through ABAQUS finite element analysis software to carry out material attribute endowing on the model, so that the modeling process is completed. According to the method, modeling of the microstructure of the transition area of the dual-performance disc and modeling of microstructures of different parts of the transition area are achieved, and the strengthening phase structure is inserted into the grain boundary part, so that the real morphology of the microstructure of the alloy is better met.

The invention provides a preparation method of a copper target material, and belongs to the technical field of metal target material preparation. According to the preparation method of the copper target material, the copper blank is subjected to hot rolling, thick columnar crystals in an original as-cast structure of the copper blank are crushed into fine grains through hot rolling, and the grain structure is more uniform; and the total volume of gaps among crystal grains is rapidly reduced, an original loose structure is compacted into a compact structure, densification treatment of the copper blank is achieved, and the dislocation density of the copper blank is increased. And then the copper target blank is cooled to 25-40 DEG C and then is subjected to cold rolling, crystal grains in the copper target blank are further rearranged, gaps between the crystal grains are further compressed, the crystal grain structure of the copper target blank is more compact, and the dislocation density is further improved. And finally, a temperature stepped annealing process is adopted, so that internal stress generated in the hot rolling and cold rolling processes can be effectively eliminated, and the hardness of the copper target blank cannot be excessively reduced due to the annealing process.

The invention discloses an efficient welding method for an exhaust silencer of a motorcycle. According to the invention, breakthrough improvement of manufacturing quality and efficiency is realized through multi-dimensional technical innovation. A high-frequency electromagnetic field resonance stress relief technology is creatively introduced, the metal crystallization behavior is intervened in real time in the welding process, and the thermodynamic equilibrium state of traditional welding is fundamentally reconstructed. Electromagnetic energy directly acts on molten metal in a microscopic particle vibration mode, lattice defects are promoted to be spontaneously repaired in the liquid stage, the deformation cracking risk caused by thermal stress accumulation in a traditional technology is avoided, and microstructure optimization is more synchronously completed. According to the dynamic energy field regulation and control means, the welding strength and toughness of the complex curved surface structure of the silencer are synergistically enhanced, a uniform and compact fine grain structure is formed in a welding seam area, the anti-fatigue performance of a product under the impact of high-temperature tail gas is remarkably improved, meanwhile, the necessary annealing procedure after traditional welding is integrated into in-situ treatment, and the production efficiency is improved. And the production period is greatly shortened.

The invention discloses a high-strength and high-toughness Al-Zn-Mg-Cu aluminum alloy profile for an ultra-large aircraft wing rib and a preparation method of the high-strength and high-toughness Al-Zn-Mg-Cu aluminum alloy profile, the Al-Zn-Mg-Cu aluminum alloy profile comprises the following alloy components in percentage by mass: 5.5-5.8% of Zn, 1.6-1.9% of Mg, 1.9-2.5% of Cu, 0.2-0.3% of Mn, 0.1-0.2% of Zr, 0.1-0.2% of Cr, 0.1-0.2% of Ti, less than or equal to 0.12% of Fe, less than or equal to 0.1% of Si and the balance of Al and inevitable impurities, and the content of a single impurity is not more than 0.05%. The total content of impurities does not exceed 0.15%; the preparation process comprises the steps of smelting casting, two-stage homogenizing annealing, extrusion, solution treatment, stretch straightening and two-stage artificial aging, a mold adopted during extrusion is a double-mold-hole mold, and mold holes of the mold are distributed left and right and are in central symmetry. According to the Al-Zn-Mg-Cu aluminum alloy and the preparation method thereof, by optimizing the alloy components, adjusting the layout of the die holes of the die and the solid solution and aging process, the grain structure of the profile is fine and uniform in distribution, and the Al-Zn-Mg-Cu aluminum alloy guarantees excellent strength while the fracture toughness is improved.

The invention discloses a method for eliminating a mixed crystal structure of medium-carbon alloy steel, and belongs to the technical field of heat treatment of steel. The mixed crystal structure eliminating method comprises the following steps: S1, heating to-be-treated medium-carbon alloy steel to Ac1-Ac3, and then preserving heat; s2, the steel obtained after heat preservation is completed is rapidly cooled to the room temperature; s3, repeating the operation for multiple times according to the steps S1 to S2; and S4, the steel treated in the step S3 is heated to be subjected to high-temperature tempering treatment and then air-cooled to the room temperature, and the medium-carbon alloy steel with the uniform grain structure is obtained. According to the method, the defects in production can be overcome, the problem of crystal mixing easily caused by large size, deformation and uneven cooling in the large die steel production process is particularly solved, and a mixed crystal structure with the original grain size level of 4-8 can be adjusted into a uniform structure with the grain size level of about 8.

The invention provides a rolling pre-deformation method for improving toughness and plasticity of 2-series aluminum alloy, and belongs to the technical field of aluminum alloy material processing. The rolling pre-deformation method comprises the following steps: sequentially carrying out solid solution quenching treatment, ultralow-temperature transverse rolling pre-deformation, rolling pre-deformation and aging treatment on a 2-series aluminum alloy hot-rolled plate. The quenching-state 2-series aluminum alloy is sequentially subjected to transverse and rolling-direction variable-temperature pre-deformation, the grain structure, dislocation configuration and distribution can be well regulated and controlled, a fine and uniform precipitated phase is obtained after aging, and the strength, toughness and forming performance of the 2-series aluminum alloy are improved while the anisotropy of the plate is reduced. The method is simple in process, convenient to operate and easy to industrialize.

The invention belongs to the field of profile steel production, and particularly relates to a rolling method of hot-rolled Q450NQR1 weather-resistant H profile steel, which adopts a reversible cogging mill and a universal finishing mill group for rolling: after the cogging mill rolls for 3-5 passes for cogging, a universal continuous rolling mill is adopted for finish rolling 9 continuous rolling, and the arrangement sequence of finish rolling hole patterns is U1-U2-U3-E4-U5-U6-U7-E8-U9; wherein the U3 and the U6 are curved web hole patterns, and the vertical roll is in drum-shaped design. The method has the advantages that one BD cogging mill is used for large-rolling-reduction rolling to crush crystal grains, and then the nine-rack universal continuous rolling mill is used for finish rolling, so that the metal flowing and steel biting conditions are improved. The grain structure is refined through large rolling reduction and low-temperature rolling, the problems that the Q450NQR1 weathering resistant steel is poor in metal fluidity, prone to cracking and the like due to alloy elements are effectively solved, and meanwhile the mechanical property, the size precision and the surface quality of products are guaranteed.

The invention discloses a process for preparing a high-strength aluminum alloy profile through gradient cooling die-electromagnetic vibration combined extrusion, and belongs to the technical field of aluminum alloy machining. According to the technology, the uniform fine grain structure and high performance of the aluminum alloy profile are achieved through the design of the length of a die working tape and the flow gradient of a cooling channel in cooperation with an electromagnetic vibration device. After a blank is subjected to homogenization treatment, the blank is extruded through a gradient cooling die, a thin-wall area working zone is 20-25 mm, the cooling water flow is 15-20 L / min, a thick-wall area working zone is 10-15 mm, the cooling water flow is 5-10 L / min, 20-50 Hz electromagnetic vibration is applied at the same time, water mist quenching and aging treatment are conducted immediately after extrusion, zinc ions serve as heterogeneous nucleation cores to promote generation of new crystal grains, ferrocene sulfenyl is adsorbed to the surfaces of the crystal grains to inhibit growth, and the thickness of the crystal grains is 10-15 mm. The average grain size is refined, and the effect is improved.

The invention discloses a bismuth ferrite-based ceramic material with low energy consumption and high energy storage and a low-temperature rapid sintering preparation method of the bismuth ferrite-based ceramic material, a flash sintering technology is applied to 0.55 BiFeO3-0. 4SrTiO3-0.05 NaNbO3 (BFST-0. 05NN) ceramic, on one hand, the component of 0.6 BiFeO3-0. 4SrTiO3 is close to a morphotropic phase boundary (MPB) to provide high polarization, and the introduction of NaNbO3 improves the structure disorder and promotes the relaxation behavior, so that the energy storage efficiency is improved; on the other hand, by optimizing the electric field (100-250 V / cm) and the flash sintering time under the fixed current density (40 mA / mm < 2 >), reactive densification can be achieved at the very low temperature and within the ultra-short time, and compared with traditional solid sintering, the furnace temperature is reduced by nearly 500 DEG C; flash sintering can realize densification of the ceramic, inhibit grain growth of the ceramic, refine a grain structure, inhibit volatilization of volatile elements and inhibit leakage conductance current at the same time, the lead-free bismuth ferrite-based ceramic with high breakdown and high energy storage and excellent ferroelectric, piezoelectric and energy storage performance is obtained, and green development and high energy storage are realized at the same time.

The invention relates to the technical field of image processing, in particular to a wire surface defect detection method and system based on an image recognition model. The method comprises the following steps: collecting a copper wire surface image; detecting a tin coating image in the copper wire surface image, and determining a surface glossiness parameter of the tin coating image; comparing the surface glossiness parameter with a standard glossiness parameter, when the deviation of the surface glossiness parameter exceeds a preset glossiness threshold value, judging that the tin coating has a uniformity defect, and recording the defect characteristics of the tin coating; detecting a texture image in the copper wire surface image, and identifying a grain boundary of the texture image; and determining the grain arrangement condition according to the grain boundary. Through an image processing technology, the surface image of the copper wire is collected and detected, so that defect detection of a tin coating and a grain structure of the copper wire in a wire production process is realized, and finally, the accuracy of surface defect detection of the wire is improved.

The invention provides a preparation method of a large-size alloy tantalum blank, which belongs to the technical field of tantalum alloy processing, and comprises the following steps: firstly, selecting tantalum powder and doped powder, and fully and uniformly mixing to obtain alloy tantalum powder; then carrying out cold isostatic pressing molding on the alloy tantalum powder to obtain a square fillet alloy blank; the square fillet alloy blank is placed in a vacuum sintering furnace, direct current is introduced for vertical sintering, the vacuum degree ranges from 1.0 * 10 <-2 > Pa to 1.0 * 10 <-3 > Pa, the sintering temperature ranges from 2400 DEG C to 2600 DEG C, and the heat preservation time ranges from 2 h to 3 h; in the direct current sintering process, non-uniform heating of the interior of the sintered material caused by intermittence is avoided, and the grain structure in the blank is more uniform; and after sintering is completed, inert gas is firstly introduced for rapid cooling in a gradient cooling mode, non-uniformity of crystal grains in the blank caused by overgrowth of the crystal grains due to the fact that the blank is in a high-temperature stage for a long time can be avoided, and then the blank is naturally cooled to the room temperature, so that the large-specification alloy tantalum blank with the mass of 10-15 kg is obtained, and the production efficiency is improved.

The invention discloses an electrolytic copper foil and a preparation method and application thereof. The preparation method of the electrolytic copper foil comprises the following steps that raw foil is sequentially subjected to acid pickling, grain structure optimization treatment, roughening treatment, functional layer plating and silane coupling treatment, then drying and rolling are conducted, and the electrolytic copper foil is prepared. Crude foil is subjected to grain structure optimization treatment to form a copper layer with a special grain structure, and the rough structure of the surface of the copper layer is optimized by accurately controlling rough curing treatment conditions, so that the high-frequency transmission and interface bonding performance of the electrolytic copper foil is synergistically improved; the prepared electrolytic copper foil has the characteristics of lower signal transmission loss and high peel strength, is low in warping degree and excellent in mechanical property, and can meet the use requirements of ultrahigh-speed communication on electromagnetic shielding layer materials with low transmission loss and high reliable bonding strength.

The invention provides a sheathing extrusion preparation method of powder metallurgy titanium alloy, and relates to the technical field of powder metallurgy titanium alloy preparation. The preparation method comprises the following steps: filling titanium alloy powder into a titanium sheath which is consistent with raw material components, and improving the filling density and the bonding strength of the powder by adopting a vibration powder filling and heating degassing process; then, through vacuum low-temperature presintering, it is ensured that powder particles are effectively combined, and grain growth is avoided; and finally, the pre-sintered blank is subjected to extrusion forming, the organization structure of the material is greatly improved, the compactness of the material is improved, full compactness is achieved, the fine-grain structure is guaranteed, and the fine-grain, high-strength and high-plasticity titanium alloy target profile is obtained. By means of the method, production of the high-performance titanium alloy profile in the complex shape can be achieved, multiple steps in a traditional technology are reduced, the production efficiency is remarkably improved, the manufacturing cost is reduced, and the method has important significance on application and popularization of the powder metallurgy titanium alloy profile.

The invention relates to the technical field of motor clamp springs, and particularly discloses a high-strength ultrathin titanium alloy for a motor clamp spring and a preparation method thereof.The preparation method comprises the steps that firstly, a titanium alloy cast ingot is subjected to hot forging machining, coarse and large crystal grains are crushed, then hot rolling is conducted, and in the hot rolling process, pulse current is adopted for assisting, and the high-strength ultrathin titanium alloy is obtained through the electroplastic effect; the method comprises the following steps: carrying out hot rolling to obtain a grain structure finer and more uniform than traditional hot rolling, then carrying out shot blasting treatment and carbonitriding treatment on the surface of a titanium alloy matrix to enhance the hardness, strength, wear resistance and fatigue resistance of the material, and finally, introducing a residual compressive stress field while eliminating surface defects and increasing surface compactness by adopting a heat-assisted ultrasonic rolling process, so as to improve the wear resistance of the material. The generation and expansion of fatigue microcracks are inhibited, and the anti-fatigue performance of the material is enhanced.

The invention discloses a processing method for solving grain growth in a solution treatment process of a high-temperature alloy, which comprises the following steps of: 1, obtaining a basic bar by adopting a hot working mode, specifically, carrying out forging cogging on a steel ingot, then carrying out hot working on the steel ingot through a fast forging machine or a rolling mill to obtain the required basic bar, and reserving a certain deformation amount; 2, stress relief annealing is conducted on the basic bar obtained in the step 1, and water cooling is conducted immediately after heat preservation is completed; 3, the bar obtained in the step 2 is subjected to cold drawing; and 4, the finished bar obtained after cold drawing is subjected to solution treatment. According to the method, firstly, residual cold deformation of the bar in the hot working process is eliminated through high-temperature stress relief annealing, then the bar reaches the specified size through cold drawing machining, the cold deformation of the bar is larger than critical deformation, finally, after standard solution treatment, grain structures of all parts of the bar are uniform, and abnormal growth of grains does not exist. The process has the advantages of environmental protection, convenience, flexibility and low cost.