80 results about "7075 aluminium alloy" patented technology

The invention discloses a 3D printing 7xxx aluminum alloy and a preparation method thereof. The 7xxx aluminum alloy comprises, by mass, 0.1-6.0% of Si, 0-6.0% of Fe, 1.2-6.0% of Cu, 0.1-6.3% of Mn, 2.1-6.9% of Mg, 0.18-0.68% of Cr, 5.1-10.1% of Zn, 0-6.2% of Ti, 0-6.0% of Zr, 0-1% of Sc, and the balance Al. An aluminum alloy workpiece subjected to 3D printing is smooth in surface and free of cracks. Moreover, 7075 aluminum alloy powder is low in price. By adopting the 3D printing workpiece prepared from the 7xxx aluminum alloy powder prepared through the preparation method, the production costcan be saved greatly.

The invention discloses an isothermal forging forming die and method for 7075 aluminum alloy tapered casing and relates to an aluminum alloy part forming die and method to solve the problems of folding, streamline disorders, surface coarse grain defects and forming difficulties in manufacturing of 7075 aluminum alloy tapered casing in the prior art. The method comprises main steps of first, blank making, wherein a cylindrical 7075 aluminum alloy blank material is subjected to flat drilling upsetting to be manufactured into a formed blank; second, pre-forging, wherein the blank is placed in a female die of a pre-forging die for pre-forging forming to be produced into a formed pre-forged part; third, primary finish forging, wherein the primary finish forging is performed to manufacture a formed primary finished forged part; fourth, primary cleaning; fifth, damage repairing; sixth, secondary finish forging, wherein the secondary finish forging is performed to manufacture a secondary finished forged part; seventy, secondary cleaning, wherein graphite on the surface is cleared away. The isothermal forging forming die and method are used for manufacturing of 7075 aluminum alloy tapered casing.

The invention discloses a hot-top casting process for casting a large-diameter hard aluminium alloy round rod by using a wiping disc. The process comprises the following steps of: a, batching; b, melting; and c, casting, wherein the casting step is a key process. The process protected by the invention is a casting process of a largest-diameter hard aluminium alloy which is put into operation in the country currently. Namely, the process comprises: hot-top casting equipment is used; the wiping disc is configured at the same time; step type casting process parameters are adopted; the suspension height of the wiping disc and the three casting process parameters are searched; and finally, the best casting process of the 7075 aluminium alloy round rod with a diameter of phi582 mm is established. According to the process disclosed by the invention, the crack tendency in the process of casting the large-diameter hard aluminium alloy can be greatly reduced without the bottoming process; the cast round bar has good grain size, thin coarse grain layer and good surface quality; and the turning quantity on the cast rod before extruding is reduced, therefore, the production cost is reduced, and the yield is increased.

The invention relates to a dissimilar metal welding joint and a welding method thereof, and belongs to the technical field of welding. The welding joint is formed by friction stir welding of AZ31 magnesium alloy and 7075 aluminum alloy by taking tin as an interface layer, and the thicknesses range of the AZ31 magnesium alloy and the 7075 aluminum alloy is from 5 mm to 20 mm; the welding method comprises the following steps: the 7075 aluminum alloy and the AZ31 magnesium alloy are placed on an advancing side and a retreating side respectively, and fixed in a butted manner, and a tin with thickness of 0.1-0.3 mm is arranged on the welding interface; the axle center of a mixing needle deviates 10-45 percent of the diameter of the mixing needle from the AZ31 magnesium alloy; and a stirring head is inclined at an angle of 2.5-3.5 degrees, the insertion speed of the stirring head is 15-20 mm/min, when the insertion depth of the stirring head is 97-99 percent of thickness of the magnesium or the aluminum alloy, the stirring head moves after being stopped for 1-3 seconds, when the rotational speed of the stirring head is 250-450 r/min, the welding speed is 50-80 mm/min, the stirring head is stopped for 2-6 seconds, and the draw speed of the stirring head is 15-30 mm/min. The welding joint has higher strength and better forming effect; the method is stable, and no environmental pollution is realized; and the pre-welding treatment is simple.

The invention provides a technique for improving the performances of a 7075 aluminum alloy extruding material. The technique comprises the following concrete technological steps: heating an alloy ingot manufactured from the 7075 alloy material; heating a mold and an extruding cylinder; putting the heated mold and ingot into an extruder and extruding; performing solution treatment on the extruded extruding material; quenching the extruding material which is subjected to the solution treatment; stretching the quenched extruding material; ageing the stretched extruding material. The invention also provides the alloy ingot used in the method, and the ingot comprises the following components in percentage by weight: smaller than or equal to 0.40% of Si, smaller than or equal to 0.50% of Fe, 1.5% to 2.0% of Cu, smaller than or equal to 0.3% of Mn, 2.5% to 2.9% of Mg, 0.20% to 0.28% of Cr, 5.5% to 5.9% of Zn, smaller than or equal to 0.2% of Ti, smaller than or equal to 0.05% of other single elements, other impurity elements and the balance Al, wherein the total amount of other impurity elements is smaller than or equal to 0.15%.

The invention relates to an extrusion moulding mold and method in a semi-solid state preparation method of an aluminium-coating magnesium composite pipe. The inner layer of the composite pipe is made from AZ91S magnesium alloy, and the outer layer of the composite pipe is made from 7075 aluminium alloy. The extrusion moulding method comprises preparation of blank, secondary heating and semi-solid state extrusion moulding, and specifically comprises the following steps: placing prepared aluminium alloy semi-solid state blank and magnesium alloy semi-solid state blank with solid fraction being 70%-90% into an extrusion cavity of an extrusion barrel through a hot charging process, and performing extrusion moulding to obtain the aluminium-coating magnesium composite pipe with the wall thickness of 4-8mm and the length of 1,200-3,000mm, wherein the preheating temperature of the mold is 250-300 DEG C, and the extrusion speed is 60-150mm/s. According to the invention, the bonding interface of the aluminium-coating magnesium composite pipe completely reaches the metallurgical bonding, and compared with other moulding methods, the extrusion moulding method has the advantages of high efficiency, short flow, good pipe quality, simple structure, and simplicity in implementation; the prepared aluminium-coating magnesium composite pipe is small in density, and high in specific strength and specific stiffness, the outer layer is corrosion-resistant, the inner layer is good in shock absorption and shock resistance, and the prepared aluminium-coating magnesium composite pipe is particularly suitable for the fields of manufacturing of baggage holders of high speed trains, seats, portable bicycle frames, high-grade lamps and lanterns, and the like, and has very wide application prospect.

The invention discloses 7075 aluminum alloy section bar on-line quenching method and system. Using the method, it is not necessary to carry out vertical quenching heat treatment, the productivity is improved and the cost is reduced. The method comprises the following steps: adopting hot extrusion forming method, extruding the 7075 aluminum alloy bar to 7075 aluminum alloy section bar, then carrying out heating treatment. The 7075 aluminum alloy section bar on-line quenching system comprises extruding system, on-line hollow heater and water quench tank.

The invention discloses a 7075 aluminum alloy plate creep age forming method. The method comprises the following steps: (1) carrying out solid-solution treatment on a 7075 aluminum alloy plate with a thickness of 2-40 mm for 30-90 minutes at a temperature of 466-480 DEG C, then water-quenching, subsequently carrying out 1-5 percent of pre-deformation and finally carrying out artificial aging treatment for 6-24 hours at a temperature of 80-120 DEG C; (2) carrying out retrogression treatment, wherein the retrogression treatment temperature is 160-200 DEG C, and the heat preservation time is 20-180 minutes, and then carrying out water quenching at a room temperature; (3) carrying out 1-5 percent of pre-deformation on the plate subjected to the retrogression treatment, then placing the plate in a mould and fixing; (4) carrying out creep age forming, wherein the creep age forming temperature is 120-160 DEG C, the applied stress is 200-260 MPa, and the forming time is 12-24 hours; (5) unloading the plate from the mould. When the method disclosed by the invention is utilized for processing the 7075 aluminum alloy plate, while the strength of the aluminum alloy plate is ensured, the corrosion resistance of the 7075 aluminum alloy plate can be effectively improved.

The invention mainly belongs to the field of plastic molding machining of metal materials and particularly relates to a heat treatment method for improving the hot punching moldability of 7075 aluminum alloy. The heat treatment method comprises the steps of solution treatment, cold mould molding, pressure-retaining quenching and ageing. The heat treatment method further comprises the step of sheetmetal forced cooling performed between the step of solution treatment and the step of cold mould molding. According to the step of forced cooling, sheet metal is cooled to a certain temperature and then deformed. By adopting the heat treatment method, the hot punching moldability of the aluminum alloy can be improved. By adopting the heat treatment method that after solution treatment, the sheetmetal is fast cooled to a molding temperature, the ductility of a material under a high temperature is fully used, and the moldability of the component is further improved on the basis of an existingaluminum alloy hot punching process.

The invention relates to a metallic material and the technical field of the processing of the metallic material, in particular to a high-strength layered composite aluminum alloy material with excellent shaping performance and a preparation method; wherein, 6009 aluminum alloy with excellent shaping performance serves as the external layer of the material and 7075 aluminum alloy with high tenacious degree serves as the internal layer; a transition layer with a thickness of millimeter magnitude and components varying in gradient is arranged between the two layers; the contents of zinc and magnesium contained in the components of internal aluminum alloy are lowered in gradient from inside to outside; the material has excellent shaping performance as 6009 aluminum alloy does; besides, the anti-corrosion performance of the material corresponds to that of 6009 aluminum alloy, while the strength is 50 % higher than that of 6009 aluminum alloy. The material has the advantages of good shaping performance, anti-corrosion and high strength and can be widely used in the fields of automobile, petrochemical industry, aviation, etc.

The invention discloses a preparation method of reclaimed 7075 aluminum alloy containing rare earth. The invention belongs to the technical field of materials. the method comprises steps that: surface impurities are removed from waste 6063 aluminum; smelting material alloys are prepared; metal aluminum is heated until melted; a mixed salt is added to the melted aluminum; the waste 6063 aluminum is added to the mixture, and the mixture is melted; metal silicon, Al-30Cu alloy, Al-10Mn alloy, Al-2Cr alloy and Al-3Ti alloy are pressed in the mixture and are melted; Al-RE alloy, metal magnesium and excess metal magnesium and metal zinc are added to the mixture; the mixture is melted and heated; mixed gas of argon and nitrogen is delivered into the mixture; the mixture is settled and used for casting; a cast ingot is subject to preheating and hot rolling; the rolled material is subject to a solid solution treatment and water quenching; then the material is subject to an aging treatment for 15-20h under a temperature condition of 110-115 DEG C. With the method, the consumption of industrial pure aluminum is reduced, waste aluminum is cyclically utilized, and sustainable development of aluminum industries can be realized. The method has advantages of high recovery rate, low cost, and low pollution.

The invention discloses a micro-nano particle reinforced aluminum alloy core filler wire for welding a 7075 aluminum alloy, and belongs to the technical field of material processing engineering. A pure aluminum strip or a 5052 aluminum alloy strip is adopted as a coating layer, alloy powder in the core comprises pure magnesium powder, manganese powder, chromium powder, titanium-aluminum alloy powder and the like, and ceramic particles such as TiC, ZrC, TiN, SiC and the like with micro-nano sizes are added into the core. When the aluminum alloy core filler wire is used, the aluminum alloy corefiller wire is placed in a groove or a welding seam, and the aluminum alloy core filler wire is welded by adopting a conventional MIG method. Compared with the prior art that an aluminum alloy solid-core welding wire is independently used for welding, the welding seam strength of the 7075 aluminum alloy can be improved, the strength matching degree of a welding joint is further improved, the sensitivity of hot cracks and air holes is reduced, the operation process is simple, and the welding process performance is excellent.

The invention provides a preparation method for multi-scale precipitation of heterogeneous aluminum alloy bars. According to the preparation method, a plurality of pure aluminum and 7075 aluminum alloy metal bars with the same length are mixed and bound, and then undergo rotating forging plastic deformation and multi-pass high-strain rotary forging deformation, so that the interfaces of initial aluminum alloy fine bars are combined to prepare pure aluminum and 7075 aluminum alloy mixed bar blanks, then multi-scale precipitation heat treatment on the bars is carried out by utilizing different age hardening behaviors of the pure aluminum and the 7075 aluminum alloy, and the heterogeneous Al and 7075 aluminum alloy bars with multi-scale precipitation phase density are finally obtained.

The invention discloses a two-stage aging treatment technology for 7075 aluminum alloy. The two-stage aging treatment technology for 7075 aluminum alloy is characterized by comprising the following steps that the 7075 aluminum alloy is kept at the temperature of 450 DEG C for 24 h to be homogenized, then the 7075 aluminum alloy is rolled to be a sheet of 5 mm thickness in a hot manner at the temperature of 420 DEG C, and the sheet is subjected to the two-stage solution treatment at the temperature of 460 DEG C for 2 h and the temperature of 480 DEG C for 1h, and finally subjected to the two-stage aging treatment at the temperature of 100-110 DEG C for 8-12 h and the temperature of 130-160 DEG C for 14-24 h. The optimal two-stage aging treatment technology is at the temperature of 105 DEG C for 8h and the temperature of 130 DEG C for 14h.

The invention relates to a preparation method of an aluminum alloy wire for metal 3D printing. The method particularly aims at a 7075 aluminum alloy wire for metal 3D printing. The preparation method of the wire comprises the steps of alloy dosing, pressing forming, vacuum induction furnace smelting, alloy pouring, forging, rotary forging, wire drawing, continuous electrolytic washing and heat treatment straightening. The surface quality of the aluminum alloy wire obtained by the adoption of the method is improved remarkably, in the 3D printing process, the wire feeding speed is stable, and strength and mobility are good.

The invention discloses a method for eliminating selective laser melting molding cracks of a 7075 aluminum alloy. The method comprises the following steps that (1), under a protective atmosphere, 7075aluminum alloy raw powder and TiB2 submicron powder are subjected to ball milling and powder mixing, and powder obtained after ball milling and powder mixing is taken out and dried; and (2), the powder dried in the step (1) is added into a powder storing cylinder of selective laser melting molding equipment, selective laser melting is conducted after working parameters of the selective laser melting molding equipment are set, a 7075 aluminum alloy molded part is obtained, and finally heating and pressurizing treatment is conducted on the 7075 aluminum alloy molded part. According to the method, the TiB2 submicron powder capable of promoting nucleation is added into the 7075 aluminum alloy raw powder, the selective laser melting molding periodic cracks of the 7075 aluminum alloy are eliminated, and the molded part is put into a heating and pressurizing furnace to be heated and pressurized to improve the density of the part.

The invention discloses a preparation method of a TiAl3 enhanced aluminum-based composite material. The preparation method is characterized by comprising the following steps: uniformly mixing cryolite powder with titanium powder according to the mass ratio of 1-0.5:1 and drying; placing a 7075 aluminum alloy into a graphite crucible and heating and melting; adding the mixed powder into a 7075 aluminum alloy melt according to the ratio that titanium accounts for 1-6 weight percent of the mass fraction of the 7075 aluminum alloy at the temperature of 830-850DEG C; extending an ultrasound amplitude transformer into the aluminum alloy melt and carrying out the ultrasound at the ultrasound power of 800-1,000W for 20-35min; and reducing the melt temperature to be 740-760DEG C and continuously carrying out the ultrasound for 2-6min. The obtained TiAl3/7075 aluminum-based composite material has fine crystal grains in the tissue; and the generated TiAl3 enhanced phase has uniform distribution, is in a fine granule shape and has no macrosegregation phenomenon. The process has the advantages of low process cost, simple flow, safety, reliability and convenient operation.

The invention discloses a low temperature ultrasonic aginreatmentg t method for a 7075 aluminium alloy and relates to the technical field of aluminium alloy heat treatment. The low temperature ultrasonic aging treatment method for the 7075 aluminium alloy comprises the steps of oil bath liquid pre-heating, workpiece oil bath heat preservation, ultrasonic aging treatment, cooling and so on. According to the low temperature ultrasonic aging treatment method for the 7075 aluminium alloy, the aging temperature needed by 7075 aluminium alloy traditional aging heat treatment can be reduced, the aging time can be greatly shortened, and the precipitated phase number is increased, the precipitated phase distribution is more dispersed. Compared with a traditional aging heat treatment method, the lowtemperature ultrasonic aging treatment method for the 7075 aluminium alloy has the advantages that requirements on an aging process can be reduced, the heat treatment cost can be reduced, the efficiency can be enhanced, the aluminium alloy aging heat treatment structure can be improved, and the aluminium alloy comprehensive performance can be improved.

The invention discloses preparing and molding devices and preparing and molding methods of nano SiC particle enhanced 7075 aluminum matrix composite material semi-solid slurry, relates to preparing and molding devices and preparing and molding methods of semi-solid slurry, and aims at solving the problems in the currently prepared particle enhanced aluminum matrix composite material semi-solid slurry that the interfacial wettability of nano particles and aluminum matrix is poor, nano particles are easy to flocculate, and the molding method is high in cost, long in technological process and poor in shape control. The preparation device comprises an oscillating device, a thermocouple, a resistance furnace, a cover board, a stirrer, a motor, a frame and a crucible. The preparation method comprises the following steps: preparing liquid 7075 aluminum alloy; carrying out ultrasonic cleaning; mixing and carrying out ultrasonic treatment; stirring and cooling; and preparing the semi-solid slurry. The molding device comprises a template, bolts, a heater, a pressure plate, a convex die, a fixing plate, a concave die sleeve, a concave die, a mold cavity and a top rod. The molding method comprises the following steps: preheating; heating; charging; pressurizing; taking out; and cooling. The preparing and molding devices and the preparing and molding methods are suitable for preparing and molding the semi-solid slurry.

The invention relates to the technical field of alloy materials, in particular to an ultra-fine crystal aluminum alloy used for preparing a pipe fitting. Raw material compositions of the aluminum alloy comprise 0.3-0.5 wt% of crystalline phase conditioning agent and 99.5-99.7 wt% of 7075 aluminum alloy, wherein the 7075 aluminum alloy contains the following elements including, by mass, 5.25-6.58%of Zn, 2.78-2.88% of Mg, 1.25-2.14% of Cu, 0.13-0.17% of Si, 0.15-0.22% of Fe, 0.09-0.16% of Cr, 0.08-0.15% of Zr, 0.05-0.07% of Mn, 0.02-0.03% of Ti, and the balance Al and inevitable impurities. Thecrystalline phase conditioning agent is a novel additive, the crystal particle refining effect is much better than that of a normal Al-Ti-B crystal particle refining agent. The aluminum alloy material has the beneficial effects of being high in hardness, good in strength and excellent in corrosion resistant performance, and due to the good refining effect of crystal particles in fine texture, thealuminum alloy has an excellent processing characteristic.

The invention discloses a lyophobic super-lubricant interface and a preparation method thereof. The lyophobic super-smooth interface is prepared by the steps of: by taking a 7075 aluminum alloy as a substrate, performing surface corrosion in an ultrasonic treatment state with nitric acid to form micro-nano structures; performing surface grafting with fluoroalkyl silane; and finally injecting a perfluoro lubricant into the micro-nano structures. The lyophobic super-lubricant interface disclosed by the invention is prepared by using a structural metal 7075 aluminum alloy which is widely applied. The prepared lyophobic super-lubricant interface has excellent repulsive interaction to water, oil and hexane with extremely low surface tension, and has a wide application prospect in the field of construction, machine manufacturing, aerospace, navigation and the like.