182 results about "Artificial aging" patented technology

The invention provides a 10.9-grade non-quenched and tempered cold heading steel wire rod and a production method thereof. The 10.9-grade non-quenched and tempered cold heading steel wire rod comprises the following chemical components: 0.23-0.27% of C, 0.30-0.50% of Si, 1.45-1.55% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 0.40-0.50% of Cr, 0.025-0.050% of Ti, 0.0025-0.0050% of B, less than or equal to 0.0050% of N and more than or equal to 0.015% of [Ti]-3.5 * [N]. According to the invention, on the basis of component design, a controlled rolling process deformation induced phase change, an online salt bath isothermal treatment cooling process and an artificial aging process are matched, so that rapid cooling and isothermal phase change of the wire rod are realized, and the prepared wire rod is uniform in through ring mechanical property, high in yield ratio, good in plasticity and long in fatigue life. The steel wire rod can be used for directly cold-drawing the steel wire without annealing, and the cold-drawn steel wire can meet the performance requirement of a 10.9-grade fastener without quenching and tempering after being formed. According to the production method of the wire rod, the production process can be simplified, the fastener production period is shortened, the cost is reduced, meanwhile, the energy consumption is reduced, and the method conforms to the current green and low-carbon development route.

The invention belongs to the field of conductive wrought aluminum alloys, and discloses a composite treatment method for synchronously improving conductivity and strength of a Fe-rich wrought aluminum alloy. The composite treatment method comprises the following steps: 1) melting the Fe-rich wrought aluminum alloy, and then carrying out microalloying treatment on B, Sr, Er and Bi; or according to the components and the content of the conductive aluminum alloy, the raw materials of pure aluminum, Fe intermediate alloy, Si intermediate alloy and B intermediate alloy of the conductive aluminum alloy are melted, then Mg intermediate alloy, Sr intermediate alloy, Er intermediate alloy and pure Bi are added, and even mixing and standing are conducted; 2) mechanical vibration casting; 3) diffusion annealing and rolling treatment; (4) solution treatment; (5) pre-aging treatment and variable-temperature rolling are conducted; and 6) artificial aging treatment. According to the method, the Fe impurity tolerance of the conductive aluminum alloy is improved, Fe-rich phase modification and refinement in the aluminum alloy are achieved, the conductivity of the alloy is remarkably improved, meanwhile, the alloy strength is improved, and regeneration and recovery of the conductive aluminum alloy are facilitated.

The invention relates to a machining method for a high-strength large thin-wall weak-rigidity aluminum alloy ring piece, and belongs to the technical field of machining. The aluminum alloy ring piece blank is subjected to solution treatment; the blank is subjected to bulging treatment; the bulged blank is subjected to artificial aging treatment; carrying out thermal vibration aging treatment on the aluminum alloy ring piece blank; rough machining is conducted on the aluminum alloy ring piece blank, and a workpiece of the aluminum alloy ring piece is obtained; performing primary destressing annealing heat treatment on the workpiece; carrying out primary semi-finishing on the workpiece; carrying out secondary destressing annealing heat treatment on the workpiece; carrying out secondary semi-finishing on the workpiece; carrying out first high-low temperature heat treatment on the workpiece; the workpiece is subjected to third-time semi-finish machining; performing secondary high-low temperature heat treatment on the workpiece; the workpiece is subjected to finish machining treatment, and an aluminum alloy ring piece product is formed; according to the method, the machining allowance is distributed, and various stress eliminating means are adopted, so that the performance and the size precision of the ring piece are guaranteed.

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 belongs to the field of wrought aluminum alloy regeneration and recovery, and discloses a method for regulating and controlling the structure and performance of a high-Fe-content 6016 regenerated aluminum alloy. The method comprises the following steps: 1) melting a 6016 aluminum alloy with high Fe content, adding a Cr-containing intermediate alloy, uniformly mixing, standing, and adding Sn to obtain a microalloyed melt; (2) the melt passes through a snake-shaped pouring gate and then enters a mold, and casting is conducted to form a cast ingot; and (3) the cast ingot is subjected to homogenizing annealing treatment, air cooling is conducted after hot rolling, then cold rolling, high-temperature solid solution treatment, cooling, natural aging and artificial aging treatment are conducted, and the regenerated aluminum alloy is obtained. According to the method, primary alpha-Al grains in the 6016 regenerated alloy are efficiently refined, the roundness is improved, and the Fe-rich phase form is effectively modified into a small Chinese character shape from a thick long needle shape. The prepared regenerated aluminum alloy is excellent in mechanical property, the harm of the impurity element Fe to the 6016 regenerated aluminum alloy is remarkably reduced, and high-quality utilization of the regenerated aluminum alloy is achieved.

The invention discloses a thermomechanical treatment preparation method of a high-toughness Al-Mg-Si alloy plate and application of the high-toughness Al-Mg-Si alloy plate in a new energy automobile covering part. The alloy comprises, by mass, 1.0%-1.5% of Si, 0.8%-1.2% of Mg, 0.4%-0.8% of Cu, 0.55%-0.95% of Mn, 0.08%-0.20% of Cr, 0.05%-0.30% of Zn and the balance Al and impurities, the ratio of Mg to Si is 1.2%-2.0%, and the ratio of Mn to Cr is 3.0%-4.5%. The preparation method comprises the following steps: smelting, cutting the head and the tail, milling the surface, carrying out graded homogenization (290-310 DEG C * 6-10 h + 550-570 DEG C * 10-14 h), carrying out hot rolling to 5-6 mm, carrying out solid solution quenching (540-570 DEG C * 0.5-1.5 h), carrying out pre-aging (70-90 DEG C * 10-14 h), carrying out cold rolling to 1-2 mm, and carrying out artificial aging (170-190 DEG C * 0.5-2 h). The method is used for new energy automobile covering parts, battery pack cover plates or automobile door anti-collision beams, and the endurance mileage is remarkably increased.

The invention belongs to the technical field of alloy preparation, and particularly discloses a double-peak heterostructure 6061 aluminum alloy and a preparation method thereof.The preparation method comprises the following steps that S1, solution treatment is conducted, specifically, the as-cast 6061 aluminum alloy is subjected to solution treatment for 4 h at the temperature of 560 DEG C, water quenching is conducted to the room temperature, and the as-cast 6061 aluminum alloy is cut into thin plates; s2, deep cooling rolling treatment is conducted, specifically, the thin plate obtained in the S2 is sequentially cooled and rolled; s3, short-time annealing treatment is conducted, specifically, annealing is conducted for 5 min at 200 DEG C, and oil cooling is conducted to the room temperature; and S4, aging treatment is conducted, specifically, artificial aging is conducted for 1-32 h at the temperature of 120-180 DEG C, and the 6061 aluminum alloy is obtained. According to the 6061 aluminum alloy with the double-peak heterostructure and the preparation method of the 6061 aluminum alloy with the double-peak heterostructure, the double-peak heterostructure of fine recrystallized grains and coarse deformed grains is obtained, then the size and the volume fraction of second-phase particles are regulated and controlled, the strengthening mechanism of the 6061 aluminum alloy with the double-peak heterostructure is disclosed, and synchronous improvement of the strength and plasticity of the 6061 aluminum alloy is achieved.

The present invention relates to an aluminum alloy welding material and a method for preparing a high-strength and tough weld, belonging to the field of welding technology. The aluminum alloy welding material of the present invention combines welding technologies such as cold metal transfer and pulse composite welding, laser welding, etc. with rapid cooling, so that elements such as Mg, Cu, and Zn in the weld are completely solid-solved and in a supersaturated state. The joint strength mainly comes from the solid-solution strengthening contribution of alloy elements such as Mg, Cu, and Zn and the precipitation strengthening contribution of the corresponding strengthening phases; then, through short-term natural aging, the solute-vacancy coupling diffusion mechanism can be realized, promoting the rapid precipitation of high-density strengthening phases in the weld, thereby realizing the strengthening and toughening of the weld, and significantly improving the weld strength and welding coefficient. Thus, the intervention of artificial aging is avoided, the welding cost is reduced, and the welding efficiency is improved.

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

The invention discloses a manufacturing process of a corrosion-resistant aluminum alloy flange plate. The manufacturing process comprises the following steps that S1, alloy smelting and component control are conducted; s2, homogenizing heat treatment; s3, hot die forging forming; s4, solution treatment; s5, multi-stage artificial aging; and S6, surface treatment. According to the flange plate and the manufacturing method thereof, through the unique alloy component design and the combination of the whole-process optimization technology of precise smelting, homogenization, die forging, solid solution, multi-stage aging and micro-arc oxidation, cooperative regulation and control of intracrystalline strengthening and grain boundary purification are achieved on the microstructure, and finally the flange plate product with excellent comprehensive performance is obtained.

Disclosed is a method for manufacturing an Al—Zn—Mg—Cu series aluminum alloy plate. The method comprises: (1) preparing an Al—Zn—Mg—Cu series aluminum alloy ingot; (2) sequentially performing homogenization, hot rolling, cold rolling, solid solution quenching and artificial aging on the Al—Zn—Mg—Cu series aluminum alloy ingot to obtain a T6-state aluminum alloy plate; (3) performing heating, warm forming, in-mold quenching, pre-aging and paint baking treatment on the T6-state aluminum alloy plate to obtain a finished aluminum alloy plate. Further disclosed is an Al—Zn—Mg—Cu series aluminum alloy plate, made using the above manufacturing method. The present invention standardizes the production process and process parameters of the Al—Zn—Mg—Cu series aluminum alloy plate, and the Al—Zn—Mg—Cu series aluminum alloy plate prepared by said manufacturing method has high tensile strength, yield strength and elongation, can be applied to automobiles, and has good popularization prospects and application value.

The application provides a high-strength rare earth magnesium alloy based on a room-temperature rotary swaging composite process and a preparation method thereof.The method comprises the following specific steps: according to designed components, raw materials are smelted to obtain a semi-continuous casting ingot, the rare earth magnesium alloy ingot is subjected to homogenization treatment, then is preheated and kept warm to be subjected to differential temperature extrusion, the extruded rare earth magnesium alloy is subjected to multi-pass rotary swaging treatment with a small deformation at room temperature, and finally is subjected to artificial aging treatment.Through the composite process with the room-temperature rotary swaging, the grains can be refined, the texture can be improved, and a large number of dislocations and twins can be introduced into the grains, so that the nucleation sites and precipitation power of precipitated phases in the aging process are improved, the aging strengthening capacity is more excellent, and the high-strength rare earth magnesium alloy is obtained.The application of the light-weight high-strength rare earth magnesium alloy in the fields of aerospace, rail transportation and automobiles can be accelerated.

The invention discloses a high-strength and high-toughness Al-Cu-Sc aluminum alloy and a preparation method, and belongs to the technical field of aluminum alloy materials, and the Al-Cu-Sc aluminum alloy is composed of the following components by mass percent: 5.0% of Cu, 5.0% of Sc, 5.0% of Al, 5.0% of Sc and the balance of Al. 0.3% of Sc; and the balance is aluminum and inevitable impurity elements with extremely low content. By increasing the Cu content, adding trace Sc elements and matching high-deformation rolling with proper artificial aging, a high-density nanoscale precipitated phase is formed in the material, and the mechanical property of the aluminum alloy is improved.

The invention discloses a process for regulating and controlling precipitated phase distribution of regenerated 6XXX series aluminum alloy based on an electromagnetic-ultrasonic composite field, and relates to the technical field of metal material processing. The method comprises the following steps: introducing a carboxyl modified polyaryletherketone-siloxane copolymer assistant in a solid-phase temperature zone, applying ultrasonic waves to synchronously act with a pulsed magnetic field, and then carrying out artificial aging. According to the method, the aging peak time is remarkably shortened, the precipitated phase is refined and homogenized, the mechanical property is obviously improved, and an innovative and efficient path is provided for improving the structure stability and performance consistency of the regenerated aluminum alloy.

The application relates to the technical field of material processing, and particularly discloses an aluminum alloy processing method through cumulative pack rolling, contact heating and artificial aging. The processing technology of the application comprises the following steps: (1) homogenizing treatment is performed on aluminum alloy material; (2) the surface of the aluminum alloy material is cleaned; (3) pre-deformation is applied to the aluminum alloy material by using a cumulative pack rolling method, and water quenching treatment is performed after the pack rolling is completed; (4) the upper and lower molds of a contact heating device are preheated to the solid solution temperature of the aluminum alloy material, and the aluminum alloy material is placed between the upper and lower molds to perform contact heating so as to realize solid solution treatment; (5) stamping forming quenching treatment; (6) the aluminum alloy material after the stamping quenching is transferred to a heating furnace to perform artificial aging treatment. The aluminum alloy processing method through cumulative pack rolling-contact heating-artificial aging can greatly shorten the solid solution time and aging time of the aluminum alloy, improve the strength and hardness of the aluminum alloy, and does not cause loss of the elongation rate of the aluminum alloy.

The application relates to a rapid air-cooling aluminum alloy cylinder cover heat treatment method and an aluminum alloy cylinder cover, which comprises sequentially performing solid solution treatment, rapid air-cooling quenching treatment and artificial aging treatment on an aluminum alloy cylinder cover casting to obtain the aluminum alloy cylinder cover; the rapid air-cooling quenching treatment comprises: cooling the aluminum alloy cylinder cover casting through air cooling, and the cooling speed between 430 DEG C and 260 DEG C is 7+ / -2 DEG C / min. The application utilizes air-cooling quenching, designs corresponding cooling speed, has little influence on strength and elongation, and better cutting performance. T6 uses water cooling, has no speed requirement, and the actually obtained strength and elongation are much higher, leading to poor cutting performance, great influence on mass production cost and efficiency. After the technology is adopted, the heat treatment process parameters are solidified, the performance detection result of the cylinder cover verified through multiple rounds of debugging is good, the stable and reliable method effectively avoids broken chip defects, abnormal tool wear or breakage, the tool has good broken chip effect, and waste loss and machining cost are reduced.

The utility model discloses a square box intelligent saw for cutting broken bridge aluminum profiles, which comprises a base and machine heads arranged on the base side by side, the machine head on the right side moves on the base, and each machine head comprises a base supported on the base and a rotating frame arranged on the base and rotating on the base. A motor is arranged on the rotating frame, a cutting saw blade is arranged on an output shaft of the motor, a front vertical plate, a rear vertical plate and a bottom plate of the base are cast into a whole, a reinforcing beam is additionally arranged, and a cast square box is formed. The casting square box is machined through a machine tool, and the position precision of all installation holes is guaranteed. After being subjected to artificial aging treatment, the cast square box is stable in structure and not prone to deformation, and the stability of equipment is improved. After integral casting, a large number of screw joint, pin hole and adjusting procedures are omitted, installation and adjustment are more convenient, the skill requirement for assemblers is lowered, and the assembling efficiency is improved.

The invention provides a high-strength titanium component hot forming and quenching integrated method based on pressure-displacement-spray quenching intensity flexible regulation and control, the method comprises four steps of heating and heat preservation treatment, rapid transfer treatment, shape property coordination control treatment and artificial aging treatment, and the shape property coordination control treatment comprises three procedures of rapid pressing, rapid spray cooling and pressure maintaining shape control. According to the method, the technical scheme of speed regulation cooling, mold and component gap adjustment and pulse pressure regulation and pressure maintaining is mainly adopted in the shape property coordination control treatment step, so that the problems of local forming cracking, three-dimensional instability deformation, non-uniform and unstable performance and the like in the existing high-strength titanium component hot forming quenching process are effectively avoided; the high-strength titanium hot forming and quenching integrated treatment disclosed by the invention can be realized by utilizing the existing equipment such as a high-strength steel hot forming press, a manipulator and a heating furnace.

The present invention discloses a preparation process for a high-strength and high-conductivity aluminum-magnesium-silicon-copper alloy, belonging to the technical field of lead frame material production processes. The high-strength and high-conductivity aluminum-magnesium-silicon-copper alloy described in the present invention contains, by mass percentage, 0.3-1.2% Mg, 0.5-1.4% Si, 5.0-7.8% Cu, 0.1-0.2% Ti, 0.01-0.1% B, and the remainder is Al and some unavoidable impurity elements. The method for preparing the finished material includes vacuum melting casting, pouring, forging, primary solid solution treatment, constant temperature vacuum treatment, reverse repeated asynchronous rolling treatment, secondary three-stage solid solution treatment, and incomplete artificial aging treatment. This process improves the strength and electrical conductivity of the aluminum-magnesium-silicon-copper alloy through reverse repeated asynchronous rolling treatment. Its workpieces can be used in the automotive, electronics, aerospace and other fields, and have very good industrial application prospects.

6xxx series aluminum alloys can be processed to produce aluminum alloy products with improved strength while maintaining a high elongation. For example, said processing method can include solutionizing a rolled aluminum alloy product comprising a 6xxx series aluminum alloy. Then, the solutionized aluminum alloy product can undergo a pre-aging step before a cold rolling step. The cold rolling step can reduce the gauge of the aluminum alloy product by 5% to 30%. Then, the cold rolled, pre-aged aluminum alloy product can undergo an artificially aging step that is performed at a higher temperature than the pre-aging. The resultant artificially aged aluminum alloy product can have a yield strength of 375 MPa to 475 MPa and a total elongation of 15% or greater.

The invention discloses a high-temperature-resistant composite aluminum alloy for a wave soldering jig and a preparation method of the high-temperature-resistant composite aluminum alloy, and belongs to the technical field of alloy preparation. The high-purity aluminum ingot, the aluminum-silicon alloy and the aluminum-iron alloy are mixed and heated to obtain a first molten metal material; mixing and smelting the first metal molten material, an aluminum-titanium-boron alloy, an aluminum-manganese alloy, an aluminum-lanthanum alloy, an aluminum-cerium alloy and a high-purity magnesium ingot to obtain a second metal molten material, then adding a composite slag remover, mixing, stirring, blowing and removing slag to obtain a third metal molten material; mixing, stirring and smelting the third molten metal and silicon carbide, and casting to form an aluminum alloy plate rough blank; the aluminum alloy plate rough blank is subjected to heat treatment and then rolled to obtain a pretreated aluminum alloy plate; and the pretreated aluminum alloy plate is sequentially subjected to solution treatment, water quenching and artificial aging treatment, and the high-temperature-resistant composite aluminum alloy is obtained. By designing a brand-new material ratio of the high-temperature-resistant rich composite aluminum alloy for preparing the wave-soldering jig, the high-temperature-resistant rich composite aluminum alloy has good mechanical properties in a high-temperature environment.

The invention relates to the technical field of machining, in particular to a machining method and clamp for reducing deformation of an oil chamber cover plate, after casting of the oil chamber cover plate is completed, destressing treatment is conducted, part of allowance is roughly machined, and natural aging or artificial aging is conducted; semi-finishing the end face, the outer circle and the inner hole of the oil chamber cover plate, eliminating the deformed part, and marking the position relationship among the holes; according to the method, most of holes of the oil chamber cover plate are machined based on drawing requirements, a clamp is used for clamping and finish machining of the end face of the oil chamber cover plate based on the positions of the holes, and finally, the remaining unmachined holes are finish machined, according to the method, part internal stress can be released in advance by removing stress and reducing part size or form and location tolerance out-of-tolerance caused by stress deformation, and most allowance is removed through rough machining; the special clamp is used for clamping, part deformation caused by three-jaw clamping is avoided, deformation of the part in the machining process is reduced, and meanwhile the perpendicularity and parallelism of the end face of the part and the form and location tolerance requirements of jumping of an inner hole and the like are met.

The application provides an artificial aging method of a natural aging state 6xxx Al-based material, wherein the artificial aging method of the natural aging state 6xxx Al-based material comprises the following steps: heating the natural aging state 6xxx Al-based material after solid solution and quenching treatment to 170-200 DEG C at a heating rate of not higher than 2 DEG C / min; performing high-temperature artificial aging treatment on the natural aging state 6xxx Al-based material after the heating treatment at a temperature of 170-200 DEG C to obtain an under-aged state 6xxx Al-based material; cooling the under-aged state 6xxx Al-based material to 100-130 DEG C; and performing low-temperature artificial aging treatment on the under-aged state 6xxx Al-based material after the cooling treatment at a temperature of 100-130 DEG C to obtain a 6xxx Al-based material. The application controls the high-temperature artificial aging and the low-temperature artificial aging, inhibits the parking effect, promotes the transition of atomic clusters to precipitated phases, avoids the formation of coarse precipitated phases, and improves the strengthening capacity of the artificial aging of the natural aging state 6xxx Al-based material.

The invention discloses a preparation method of a high-strength corrosion-resistant Al-Mg-Zn alloy thick plate, belongs to the technical field of alloys, and particularly relates to the preparation method of the high-strength corrosion-resistant Al-Mg-Zn alloy thick plate. The invention aims to solve the technical problem that the high-Mg-content aluminum alloy with high corrosion resistance is difficult to produce at present. The method comprises the following steps: carrying out soaking treatment, hot rolling, solution treatment, quenching, cold deformation and artificial aging treatment on an Al-Mg-Zn alloy ingot. The prepared Al-Mg-Zn alloy thick plate is high in strength and excellent in corrosion resistance, the process is simple, the production cost is low, and good matching of the high strength and the corrosion resistance of the Al-Mg-Zn alloy thick plate is achieved under the existing equipment condition. The method is used for preparing the high-strength corrosion-resistant Al-Mg-Zn alloy thick plate.

The invention discloses a high-strength and high-toughness ADC12 cast aluminum alloy and a preparation method thereof, and belongs to the technical field of aluminum alloy preparation. The ADC12 cast aluminum alloy comprises the following chemical components in percentage by weight: 9.6%-12.0% of Si, less than or equal to 1.3% of Fe, 1.5%-2.5% of Cu, less than or equal to 0.5% of Mn, less than or equal to 0.3% of Mg, less than or equal to 0.5% of Ni, less than or equal to 1.0% of Zn, less than or equal to 0.2% of Sn, 0.1%-0.3% of Tb and the balance of aluminum and inevitable impurity elements. According to the ADC12 cast aluminum alloy, the content of a copper element is reduced, and meanwhile, a trace amount of rare earth terbium element is added to refine a structure, so that the strength and the toughness are improved, and the strength reduction caused by the reduction of the copper element is made up. Meanwhile, artificial aging treatment is provided, and the strength is further improved by separating out a secondary strengthening phase, so that the ADC12 material which is low in cost, high in strength and high in toughness is developed, and the high-strength requirement under the extreme condition is met.

The application provides an aluminum alloy component forging-heat treatment fusion high-quality and high-efficiency forming manufacturing process, which comprises selecting an aluminum alloy blank to perform forging at a first preset temperature to obtain an aluminum alloy forging product meeting technical requirements; wherein the first preset temperature makes the aluminum alloy blank be in a solid-liquid coexisting state. The application adopts a process route of heating-forging-quenching-artificial aging treatment, and compared with a traditional aluminum alloy casting process and a forging process, the process route fully utilizes respective advantages of the casting and the forging forming, considers the shape control and property control problems of the product, and obtains a product with a compact structure and few defects such as holes. In addition, under the premise of fully meeting the performance requirements of the product, the application shortens the product forming process, and greatly reduces the production cycle and the production cost.

The application discloses a medium-high strength 7020 aluminum alloy profile with complex cross section and a preparation method thereof. The profile comprises alloy components with the following mass percentages: Si is less than or equal to 0.18%, Fe is less than or equal to 0.25%, Cu is 0.10-0.20%, Mn is 0.3-0.5%, Mg is 1.2-1.4%, Cr is 0.25-0.35%, Zn is 4.6-5.0%, Ti is 0.04-0.06%, Zr is 0.10-0.15%, and Zr+Ti is 0.15-0.20%, and the rest is Al and inevitable impurities. The preparation method comprises the following steps: melting and casting, homogenization treatment, extrusion, online quenching, stretching, sawing, artificial aging and the like. The 7020 aluminum alloy profile with high strength and good toughness and small mechanical property difference at different thickness positions of the cross section is obtained by combining the alloy components with the preparation process, and is suitable for preparing the complex cross section aluminum alloy profile.

This invention discloses a method for manufacturing a precision-cast aluminum alloy underbeam welded component for an off-road vehicle frame. The method includes: preparing an Al-Si-Mg-Mn-Zr-Ti-Sr-B series cast aluminum alloy; melting, degassing, and filtering the aluminum alloy material, followed by modification and grain refinement treatment; forming the underbeam casting blank using precision casting, and setting local feeding and / or local cooling in the welding connection area to form a refined and dense structure with a secondary dendrite spacing of no more than 35μm in the welding connection area and within 20mm to 50mm on both sides; performing solution treatment, quenching, and under-aging pre-weld heat treatment on the casting blank; performing final surface cleaning of the welding connection area before welding, and welding the underbeam casting blank to a crossbeam, reinforcement, connecting seat, mounting lug, or another underbeam segment using low heat input welding within 4 hours after cleaning; and finally performing post-weld graded artificial aging treatment. This invention improves the problems of heat-affected zone softening, weld mismatch between weld and base material properties, and fatigue cracking induced by casting defects in welded aluminum alloy vehicle frame bottom beams by coordinating material composition, casting structure, welding heat input, and post-weld structure recovery. It is applicable to off-road vehicle frame bottom beams and other aluminum alloy cast-welded composite load-bearing structural components.

The invention discloses a 7075 aluminum alloy CMT additive manufacturing process and a post-treatment method, and the method comprises the following steps: carrying out multilayer electric arc additive manufacturing by adopting CMT, selecting high-purity argon as protective gas, setting the deposition rate to be 30-45 cm / min, cooling to room temperature after deposition to obtain a deposited aluminum alloy, and carrying out a subsequent treatment process which comprises the following steps: (1) carrying out solution treatment; (2) performing subzero treatment, transferring the sample into constant-temperature water at about 25 DEG C after the treatment is completed, returning the temperature, taking out the sample, and blow-drying the sample; and (3) artificial aging is conducted, and water quenching is conducted after artificial aging is finished. According to the preparation technology and the post-treatment method for changing the performance of the 7075 aluminum alloy, the 7075 aluminum alloy containing the MgZn2 strengthening phase is obtained, the structure is stable, the performance is improved, and the requirements of existing special components can be met.

The application discloses a manufacturing method of Al-Zn-Mg-Cu system aluminum alloy plate, which comprises the following steps: (1) preparing Al-Zn-Mg-Cu system aluminum alloy ingot; (2) sequentially performing homogenization treatment, hot rolling, cold rolling, solid solution quenching treatment and artificial aging treatment on the Al-Zn-Mg-Cu system aluminum alloy ingot to obtain T6 state aluminum alloy plate; (3) performing heating, warm forming, in-mold quenching, pre-aging treatment and baking varnish treatment on the T6 state aluminum alloy plate to obtain finished aluminum alloy plate. In addition, the application further discloses an Al-Zn-Mg-Cu system aluminum alloy plate prepared by the above manufacturing method. The production process and process parameter of the Al-Zn-Mg-Cu system aluminum alloy plate are standardized, the Al-Zn-Mg-Cu system aluminum alloy plate prepared by the manufacturing method has high tensile strength, yield strength and elongation, and can be applied to automobiles, and has good popularization prospect and application value.