51 results about "Superplasticity" patented technology

The invention relates to the technical field of titanium alloy pipe manufacturing, and particularly discloses a preparation method of a titanium alloy thin-walled pipe with superplasticity, comprising the following steps: S110, annealing a titanium alloy bar below a phase transformation point in a vacuum annealing furnace; s120, the annealed bar material is subjected to reciprocating extrusion treatment; s130, the bar subjected to reciprocating extrusion treatment is subjected to forward extrusion to form a pipe blank; s140, the pipe blank is subjected to superplastic bulging treatment; s150, after superplastic bulging is finished, heat preservation is stopped, and inert shielding gas continues to be blown in for cooling to the room temperature; and S160, stress relief annealing is conducted on the thin-walled pipe obtained after superplastic bulging, and the titanium alloy finished pipe with superplasticity is obtained. According to the method, the plasticity of the titanium alloy pipe is remarkably improved through reciprocating extrusion and superplastic bulging, the deformability is improved, meanwhile, the grain size is regulated and controlled, and preparation of the high-performance and high-size-precision thin-wall pipe is achieved.

The invention discloses a method for preparing a thin-wall part with a snakelike hollow channel by adopting superplastic forming / diffusion bonding. The method comprises the following specific steps: step 1, plate preparation and surface cleaning treatment; and step 2, solder resist coating: using a mask plate to deposit on a specific area of the plate and coating the solder resist according to an S-shaped shape, and removing the protective adhesive tape after spraying is completed. And 3, assembling and sealing, wherein the plates are stacked according to the design sequence, the edges are sealed and welded, and an air inlet / outlet is reserved to be connected with an air pipe. And 4, heating is conducted, specifically, the assembly is put into a mold, then the mold is uniformly put into a superplastic forming machine tool, and heating is conducted till the plate superplastic forming temperature is reached. And fifthly, diffusion bonding is conducted, specifically, uniform pressure is applied to the mold through a pressing head in the superplastic machine tool, so that diffusion bonding combination is conducted on the contact face, not coated with the solder resist, of the plate at high temperature and high pressure, and a connecting rib is formed. And 6, superplastic forming / diffusion bonding is conducted, specifically, the temperature is kept, and high-pressure inert gas is introduced into the assembly through a reserved air inlet according to an air pressure loading curve. And the plate coated with the solder resist is subjected to superplastic deformation and is attached to a mold cavity, diffusion connection between the plates is completed in the area not coated with the solder resist, and finally the needed thin-wall part with the serpentine channel cavity is formed. And 7, cooling and demolding are conducted, specifically, the thin-wall part with the snake-shaped hollow channel is taken out after cooling to the room temperature, and the residual solder resist is cleaned.

The invention discloses a method for preparing an aluminum alloy superplastic plate for rail transit through asymmetrical rolling, and belongs to the technical field of alloy material processing. In order to solve the problems that commercial 5083 aluminum alloy is poor in high-temperature superplasticity and low in strain rate, the method comprises the steps that a commercial hot-rolled aluminum alloy plate serves as an initial material, small-rolling-reduction conventional rolling and large-rolling-reduction small-asynchronous-ratio overturning asynchronous rolling are adopted, and the high-temperature superplasticity of the commercial 5083 aluminum alloy plate is obtained; and straightening, recrystallization annealing and the like are carried out to obtain the aluminum alloy fine-grain plate with good superplasticity for rail transit. According to the method, different shear stresses in the rolling direction are introduced through overturning asymmetrical rolling, thin and long crystal grains obtained through conventional rolling are broken for multiple times to form fine sub-grains, uniform and fine equiaxed crystal grains are obtained after recrystallization annealing, and preparation of the superplastic plate is achieved. According to the method, the cost of superplastic forming is reduced, and guidance is provided for industrial production of superplastic forming of the aluminum alloy for rail transit.

The present invention discloses a metal superplasticity testing device and testing method, which relates to the technical field of metal property detection. The device comprises two clamps, each comprising a clamping component and a sample loading component, wherein the sample loading component comprises a connecting body, a base and a fixing plate. The clamping component is fixed to the connecting body, a base is provided on one side of the connecting body, a fixing plate is provided on the side of the base away from the connecting body, a fixing groove is formed between the fixing plate and the connecting body, a sample loading hole is provided on the fixing plate that passes through the upper and lower end faces and the front end face, a positioning hole is provided on the base that passes through the upper and lower end faces, and the sample loading hole is connected to the positioning hole. By adopting an I-shaped specimen, processing cost and efficiency are saved. A clamp is connected to each of the two high-temperature connecting rods, so that a smaller-sized specimen can be used to perform a high-temperature tensile test on a high-temperature tensile testing machine, thereby avoiding affecting the accuracy of the test. Therefore, the research test of metal superplasticity can be smoothly carried out using a traditional high-temperature tensile testing machine.

The invention discloses an aluminum alloy material and a preparation method and application thereof, and relates to the technical field of aluminum alloy materials, and the aluminum alloy material comprises the following element components by mass percent: 5.5-6.5% of Zn; 2.8% to 3.2% of Mg; cu: 1.0%-1.3%; 0.12% to 0.18% of Zr; 0.08% to 0.12% of Sc; 0.02% to 0.04% of Ti; and Al: the balance. The preparation method of the aluminum alloy material comprises the steps of smelting, casting, homogenizing, multi-pass hot rolling, intermediate annealing, solution treatment, aging treatment and the like. The problems that an existing superplastic aluminum alloy is high in forming temperature and large in energy consumption, strength and plasticity after forming are difficult to consider at the same time, grain size control is unstable, and consequently the surface quality of a formed part is poor are solved.

The invention provides a low-temperature superplastic titanium alloy. The low-temperature superplastic titanium alloy comprises, by mass, 4.5%-5.5% of Al, 2.5%-3.5% of V, 0.5%-1.5% of Mo, 0.5%-1.5% of Cr, 1%-2% of Fe, 0-0.3% of Ni, 0-0.5% of Si and the balance titanium and inevitable impurities. The balance is titanium and inevitable impurities; wherein the equivalent weight of # imgabs 0 is larger than 6, the equivalent weight of # imgabs 1 is smaller than 6, and the sum of the content of Fe, Ni, Cr and Si is smaller than or equal to 3%. According to the low-temperature superplastic titanium alloy provided by the invention, component design is carried out by comprehensively considering factors such as strength, cost, diffusion rate, density and two-phase proportion, and two-phase region hot rolling is combined, so that the obtained alloy material is uniform and fine in microscopic structure, the grain size of an annealed plate is 0.86-1.5 mu m, and the grain size of the annealed plate is 0.86-1.5 mu m at the temperature of 650-750 DEG C; the elongation of the material is 935-2150% under the deformation condition that the tensile strength of the material ranges from 5 * 10 <-3 > / s to 5 * 10 <-4 > / s and the strain rate ranges from 5 * 10 <-3 > / s to 5 * 10 <-4 > / s, and the material has the advantages of being low in superplastic forming temperature, low in flow stress and the like and has potential application value in the field of aviation superplastic forming The invention further provides a preparation method of the low-temperature superplastic titanium alloy plate and the titanium alloy plate.

The application discloses a preparation process of superplastic magnesium alloy, which comprises the following steps: magnesium alloy waste is treated by low-temperature ball milling to prepare nanoscale powder, the low-temperature ball milling temperature is less than or equal to 200 DEG C, the powder particle size after ball milling is less than or equal to 100 nm, and argon gas is introduced to protect the ball milling process to inhibit oxidation; the nanoscale powder is mixed with 5-8% mass ratio of Mg-Zn-Ca alloy powder, densification is carried out by adopting spark plasma sintering (SPS) at 350-400 DEG C, the sintering pressure is 20 MPa, the holding time is 10 min, and the density after sintering is greater than or equal to 98%; the sintered blank is subjected to equal channel angular pressing (ECAP) treatment, the extrusion temperature is 300 DEG C, the extrusion pass is 4 times, the mold channel included angle is 90 DEG, and the superfine-grained magnesium alloy with an average grain size of 2.1 mu m is obtained; the application realizes grain superfine of 1.5-2.1 mu m through a multi-field coupling process, activates a non-basal slip system at room temperature, the strain rate sensitivity index m is greater than or equal to 0.35, the elongation at 250 DEG C reaches 280%, and the superplastic magnesium alloy has high strength and superplastic deformation capacity.

This invention provides a low-alloy-content fine-grained superplastic magnesium alloy and its preparation method. The magnesium alloy, by mass percentage, comprises: Al 0.6-1.1%, Ca 0.2-0.4%, Mn 0.3-0.5%, unavoidable impurities ≤0.05%, and the balance being Mg. The preparation method of the magnesium alloy mainly includes: (1) casting the magnesium alloy melt to obtain an ingot; (2) homogenizing the ingot and then extruding it; (3) performing multiple low-temperature variable extrusion rate equal-diameter angular extrusion treatments. Without adding rare earth elements, the low-alloy-content fine-grained superplastic magnesium alloy prepared by this invention has a uniform fine-grained structure and excellent high-temperature tensile properties. The alloy exhibits an elongation >320% at 325℃. This invention realizes the preparation of low-alloy-content rare-earth-free superplastic magnesium alloys, reduces processing temperature, eliminates the solution treatment before equal-diameter angular extrusion and the annealing step after equal-diameter angular extrusion, and improves alloy performance while contributing to the economical production of superplastic magnesium alloys.

A non-heat treated cold rolled super plastic low density steel sheet comprising by weight 0.12% ≤ carbon ≤ 0.5%,3% ≤ manganese ≤ 9%,5% ≤ aluminum ≤ 9%,0% ≤ silicon ≤ 2%,0% ≤ phosphorus ≤ 0.1%,0% ≤ sulfur ≤ 0.03%,0% ≤ nitrogen ≤ 0.1%, 0 ≤ niobium ≤ 0.03%, 0 ≤ titanium ≤ 0.2%, 0% ≤ molybdenum ≤ 0.5%, 0% ≤ chromium ≤ 0.6%, 0% ≤ copper ≤ 2.0%, 0% ≤ nickel ≤ 3.0%, 0% ≤ calcium ≤ 0.005%, 0% ≤ boron ≤ 0.01%, 0% ≤ Magnesium ≤ 0.005%, 0% ≤ Zirconium ≤ 0.005%, 0% ≤ Cerium ≤ 0.1%,and the balance including iron and unavoidable impurities, the steel sheet having a microstructure comprising, in area fraction, 50% to 100% ferrite and 0% to 50% of austenite.

The invention discloses a method for improving superplasticity of a TC4 titanium alloy laser welding joint, relates to the field of alloys, and aims to solve the problem that the superplasticity of an existing TC4 titanium alloy laser welding joint is poor. The method comprises the steps that TC4 titanium alloy powder and Yb2O3 powder are mixed, ball-milled, subjected to laser welding and then subjected to superplastic forming; the high-temperature dynamic environment of a laser molten pool is utilized, Yb2O3 directly participates in the nucleation and growth process of weld grain, and beta grains are fundamentally refined (not repairing coarse grains after welding); and the extra cost and the deformation risk of post-welding treatment are avoided.

The application discloses a method for improving superplasticity of Ti65 high-temperature titanium alloy plate, which comprises the following steps: firstly, heat treating the Ti65 high-temperature titanium alloy plate in a muffle furnace; and then, hot-rolling the Ti65 high-temperature titanium alloy plate on a rolling mill. The Ti65 high-temperature titanium alloy plate is solid-solution treated in the muffle furnace at a temperature of 1050 DEG C for 120 min, and then water-cooled; then, the Ti65 high-temperature titanium alloy plate is aging treated in the muffle furnace at a temperature of 520 DEG C to 720 DEG C for 60 min to 80 min, and then air-cooled. Finally, the Ti65 high-temperature titanium alloy plate is polished on sandpaper to eliminate surface oxides, and Ti-1 antioxidant is uniformly coated on the surface of the Ti65 high-temperature titanium alloy plate to protect the Ti65 high-temperature titanium alloy plate from high-temperature oxidation. The Ti65 high-temperature titanium alloy plate prepared through the simple rolling and heat treatment process has excellent superplasticity, and the tensile elongation is up to 600% to 700%, so that the Ti65 high-temperature titanium alloy plate can meet the hot working forming requirement of complex-geometric-shape components and can fully realize the hot working forming of the complex-geometric-shape components in an airplane, and has good practicability.

The application relates to an alloy skin forming die and method, and belongs to the technical field of metal plastic working, and solves the problems of low profile precision, poor integrity and high cost of an alloy skin in the prior art. The alloy skin forming die comprises an upper die and a lower die, and further comprises a gas quenching die. The alloy skin forming die provided by the application can be used for aluminum alloy local large deformation skin forming, an aluminum alloy local large deformation skin is prepared through a friction stir processing / fluid forming method, the manufactured aluminum alloy local large deformation skin has high precision and good integrity, and the aluminum alloy local deformation capacity can be improved. The alloy skin forming die provided by the application can also be used for aluminum lithium alloy skin forming, an aluminum lithium alloy skin is prepared through a superplasticity / gas quenching forming method, and finally, the aluminum lithium alloy skin not only has high profile precision, but also has high tensile strength performance, the process flow is simple, the processing cost is low, and the aluminum lithium alloy skin has good integrity and consistency.

This invention discloses a high-temperature titanium alloy phase change superplastic diffusion bonding method, belonging to the field of material welding technology. The bonding method is as follows: the surface of the high-temperature titanium alloy sample to be welded is pretreated and chemically etched sequentially, followed by magnetron co-sputtering to sputter a layer of iron-nickel composite film onto the surface, obtaining an intermediate sample. The intermediate sample is then annealed to obtain a sample to be welded with the iron-nickel composite film layer; the iron-nickel composite film accounts for 0.55%~0.80% of the mass of the high-temperature titanium alloy sample; the mass ratio of iron to nickel in the iron-nickel composite film is (70:30)~(90:10); the sample to be welded with the iron-nickel composite film layer is then welded through multiple cycles of heating and cooling within a preset temperature range using a phase change superplastic diffusion process. This phase change superplastic diffusion bonding method solves the technical problems of low efficiency and unstable mechanical properties of welds in traditional isothermal diffusion welding.

The invention discloses a low-temperature superplastic TiAl alloy with a double-phase fine grain structure and a preparation method of the low-temperature superplastic TiAl alloy, and belongs to the technical field of TiAl alloy plastic processing. According to the preparation method, firstly, powder of elemental Ti, Al and the like is subjected to mechanical alloying through high-energy ball milling, and then the TiAl alloy with the double-phase fine grain structure is prepared through vacuum hot pressing sintering. According to the TiAl alloy superplastic forming method, the designed TiAl alloy is of an equiaxial double-phase fine grain structure, it can be guaranteed that the TiAl alloy is subjected to superplastic deformation at the low temperature, the preparation process is very simple, high-end equipment is not needed, other complex follow-up treatment is not needed for the formed alloy, and the TiAl alloy superplastic forming method is low in energy consumption and pollution and suitable for industrial production. And a new path is provided for realizing the superplasticity of the TiAl alloy through powder metallurgy.

The present invention belongs to the technical field of metallurgical materials and relates to a preparation method for a superplastic heterogeneous steel of twinned martensite and nano austenite. The method of the present invention is as follows: molten steel is cast by sub-rapid solidification technology to obtain a casting sample; the casting sample is heated to the full austenitizing temperature range for short-time isothermal annealing, and then air-cooled to 800-900 °C for hot rolling, with a reduction ratio of 25-70%; the hot-rolled steel strip is air-cooled to a temperature range 50-100 °C below the Ms temperature for short-time isothermal tempering, and then immediately water-quenched to obtain the finished steel. The yield strength of the obtained product is 700-900 MPa, the tensile strength > 1000 MPa, the elongation after fracture > 33%, and the product of strength and plasticity is 34-40 GPa%. The present invention significantly expands the dimension of advanced high-strength steel material design, provides new research ideas and directions for the development of new advanced high-strength carbon steels with low cost and high thermal stability, and has broad application prospects.

The invention discloses a superplastic inflatable forming hydraulic machine, which relates to the technical field of inflatable forming, and comprises a mold locking hydraulic machine system, a high-pressure air source system, a blank heating system, a mold system and an auxiliary system, the mode locking hydraulic machine system is composed of a mode locking hydraulic machine and a lateral pushing cylinder servo material supplementing sealing mechanism. The high-pressure gas source system is composed of a low-pressure gas compression system, a low-pressure gas generator, a low-pressure gas storage system, a high-pressure pressurization system, a high-pressure gas storage system, a gas pressure control system, a gas cooling system and a gas silencing and exhausting system. Through cooperation of the blank heating system and the high-pressure air source system, the aim of rapidly and evenly heating the whole blank can be achieved through a heating electrode of the self-resistance heating system, the problem that lattice slippage of light alloy is difficult at the normal temperature is effectively solved, the forming difficulty is reduced, superplastic air bulging forming is adopted, and the forming quality is improved. Blanks can be conveniently and evenly attached to the inner cavity wall of the die, and the quality of formed products is effectively improved.

The present invention provides a high strain rate superplastic magnesium alloy and a short process for preparing the same. The composition of the magnesium alloy is as follows by mass percentage: 8.5-9.2% of aluminum, 0.8-1.2% of zinc, 0.4-0.7% of tin, and the balance is magnesium and additive elements, and the additive element is 0.05-0.1% of manganese. The preparation method of the alloy includes casting, solution treatment, extrusion, rolling and annealing treatment. The present invention can achieve large-scale non-uniform dynamic recrystallization, further expand the microstructural non-uniformity, and obtain a coarse / fine grain micro-layer with significantly different sizes, namely a non-uniform lamellar structure, inside the magnesium alloy structure; at high temperature and high strain rate, the superplasticity of the magnesium alloy is >600%, and the alloy can be rapidly formed at high temperature; the alloy has low cost, simple preparation process, few rolling passes and short annealing time, breaks through the technical constraints of the poor superplastic forming ability of the original commercial magnesium alloy, and can be used for industrial rapid forming of complex magnesium alloy components.

The invention is applicable to the technical field of metal plastic forming dies, and provides a cup-shaped part superplastic positive and negative gas bulging forming die which comprises a movable die and a static die, a cup-shaped molded surface is arranged at the top of the static die, a reverse pre-forming molded surface is arranged at the bottom of the movable die, a movable die sealing ring is arranged on the lower surface of the movable die, and a reverse pre-forming molded surface is arranged on the lower surface of the movable die. A static mold sealing ring is arranged on the upper surface of the static mold; a movable mold air hole is formed in the side wall of the movable mold, and a static mold air hole is formed in the side wall of the static mold. According to the device, positive and negative bidirectional active controllable gas expansion forming is firstly carried out on the upper cavity, so that the wall thickness uniformity of the deep-cavity cup-shaped part can be remarkably improved, the filling capacity of a complex structure is enhanced, wrinkling and cracking are effectively inhibited, and the material utilization rate and the quality of a formed part are improved.

This superplastic alloy contains transition metal carbides and dissimilar metal elements with respect to tungsten in amounts of 0.1-20 wt% for the dissimilar metal elements and 0.2-5.0 wt% for the transition metal carbides. One or more of the dissimilar metal elements exist as a solid solution or in a segregated manner at grain boundaries in a tungsten parent phase. One or more of the transition metal carbides are finely deposited at grain boundaries, within grains, or both at grain boundaries and within grains.

The invention relates to the field of metal material preparation, in particular to a device and a method for preparing a titanium-aluminum-based alloy plate, which are used for solving the problems of difficulty in mold filling, unstable structure property and the like in the existing preparation of a TiAl alloy plate and have the technical key points that a melt is centrifugally cast to obtain a titanium-aluminum-based alloy pipe fitting; the melt is obtained by melting raw materials for preparing the titanium-aluminum-based alloy pipe fitting in the yttrium oxide crucible. And carrying out homogenizing heat treatment on the titanium-aluminum-based alloy pipe fitting. The titanium-aluminum-based alloy pipe fitting subjected to homogenizing heat treatment is rolled, the titanium-aluminum-based alloy plate is obtained, the ductility of the rolled alloy plate is increased to 125%, and the alloy plate shows superplasticity, compared with a traditional multi-link technology, the forming process is greatly simplified, the structure uniformity and comprehensive performance of the finished plate are remarkably improved, and the production cost is reduced. The method is suitable for preparing a series of TNM series titanium-aluminum alloy plates.

A preparation method of an amorphous alloy microfluidic chip master mold. First, prepare mold steel and an amorphous alloy sample, and utilize the superplasticity characteristics of the amorphous alloy for thermoplastic forming to replicate the surface topography of the mold steel mold. After cooling and demolding, an amorphous alloy microfluidic chip master mold is obtained. In addition, the amorphous alloy micro mold prepared by the above method is used for thermocompression forming of a polymer, and after cooling and demolding, a microchannel with a complete shape and clear contour is obtained. Then, the amorphous alloy micro mold is crystallized to obtain a mold with high-temperature stability, and glass is thermocompression formed at a certain temperature, and after cooling and demolding, a microchannel with a complete shape and clear contour is obtained. The present invention can prepare amorphous alloy microfluidic chip master molds of different sizes by adjusting the channel size on the surface of the mold steel, thereby thermocompression forming polymers, glass, etc., and can realize the rapid and batch production of microchannels, thereby improving efficiency and reducing costs.

The invention relates to superplastic austenite-based dual-phase light steel and a preparation method thereof, belongs to the technical field of light steel, and solves one of the problems of low elongation, poor structure stability and low industrial efficiency of high-aluminum light steel in high-strain-rate superplastic forming in the prior art. The superplastic austenite-based dual-phase light steel comprises the following components in percentage by mass: 0.3%-0.35% of C, 28.0%-36.0% of Mn, 7.0%-9.0% of Al, 0.8%-1.0% of Nb, 0.8%-1.0% of V, 0.8%-1.0% of Mo, 0.8%-1.0% of W, less than 0.03% of P, less than 0.01% of S and the balance of Fe. And the balance of Fe and inevitable trace impurities. The austenite-based dual-phase light steel prepared by the invention has good superplasticity.

The application belongs to the technical field of steel metallurgical material, and relates to a short-flow production method of superplastic thin strip steel and the superplastic thin strip steel. Molten steel is cast into a thin strip with a thickness of 2-5 mm by a double-roller thin strip continuous casting machine; the thin strip is naturally air-cooled to 950-1050 DEG C after leaving the crystallization roller, and then hot-rolled at a temperature of 850-950 DEG C with a reduction of 20-50%. The hot-rolled steel strip is cooled at a cooling speed of not less than 50 DEG C / s. The cooled thin strip is coiled at a temperature of 300-350 DEG C, and immediately water-cooled after coiling to obtain a finished steel coil. The yield strength of the final thin strip steel is 700-865 MPa, the tensile strength is 1024-1078 MPa, the elongation after fracture is 30-36%, and the product of strength and plasticity is 31-39 GPa%. The application realizes the super-high plasticity high-strength steel in a super-short flow and super-low cost mode. The process route of the application is short, efficient and low in cost, and is convenient for the industrialization and industrial application of advanced high-strength steel.

The invention discloses a high-temperature titanium alloy phase change superplastic diffusion bonding method, and belongs to the technical field of material welding. The connection method comprises the following steps: sequentially carrying out pretreatment and chemical etching treatment on a to-be-welded surface of a high-temperature titanium alloy sample, then carrying out magnetron co-sputtering treatment, sputtering a layer of iron-nickel composite film on the to-be-welded surface of the high-temperature titanium alloy sample to obtain an intermediate sample, and then carrying out annealing treatment on the intermediate sample to obtain the high-temperature titanium alloy. Preparing a to-be-welded sample plated with an iron-nickel composite film layer; the iron-nickel composite film accounts for 0.55%-0.80% of the mass of the high-temperature titanium alloy sample; the mass ratio of iron to nickel in the iron-nickel composite film is (70: 30)-(90: 10); and the to-be-welded sample plated with the iron-nickel composite film layer is welded through multiple times of cyclic heating and cooling in a preset temperature interval through a phase change superplastic diffusion process. The phase-change superplastic diffusion bonding method is used for solving the technical problems that traditional constant-temperature diffusion welding is low in efficiency and the mechanical property of a welding seam is unstable.

The name of the present invention is an enhanced superplastic forming and diffusion bonding structure. An outer panel is formed from a superplastic material, which includes an outer skin of titanium to accommodate the high thermal stresses imposed on a hypersonic transport vehicle during hypersonic flight. The outer skin is secured to a underlying enhanced framework structure, which consists of a superplastic formable reinforcement (SFR) layer, such as a titanium, zirconium, and molybdenum (TZM) alloy, which supports the outer skin when the outer skin is heated to a temperature in excess of 1200 degrees Fahrenheit. The outer panel includes a separate inner skin, which is configured for attachment to framework members, such as ribs, stringers, or spars of a hypersonic transport vehicle. A multi-cell core is sandwiched between the outer skin and the inner skin to impart tensile and compressive strength to the outer panel. In one disclosed method, the core is superplastic formed and diffusion bonded to the outer skin and the inner skin.

The application provides a method for preparing Au-Ag multistage nano optical layer on the surface of various rigid materials. The method stacks porous anodic aluminum oxide / polishing template, polished Au-Ag alloy and mechanically / chemically treated rigid material in sequence, and after heating, pressurizing and pressure maintaining, the Au-Ag alloy is filled into the micro-holes of the template to form nanowire or mirror layer on one side, and is embedded into the microstructure on the surface of the rigid material to realize riveting on the other side; after cooling, the template is removed, and the Au-Ag primary nanowire array structure or mirror layer structure on the surface of the rigid material is prepared. The primary nanowire array structure on the surface of the material is subjected to etching treatment, secondary nanopores are constructed on the surface, multistage nano structure is formed, and the optical layer is obtained. The process flow of the application is simple, the experimental period is short, the electroplating process is not needed, the production process is green, environment-friendly and pollution-free, the controllability of the multistage nano structure is strong, and the Au-Ag multistage nano structure array, mirror layer and other optical layers can be formed on the surface of various rigid materials.

An un-heat treated cold rolled superplastic high manganese low density steel sheet comprising: 0.12% ≤ carbon ≤ 0.5%, 12% ≤ manganese ≤ 20%, 5% ≤ aluminum ≤ 9%, 0% ≤ silicon ≤ 2%, 0% ≤ phosphorous ≤ 0.1%, 0% ≤ sulfur ≤ 0.03%, 0% ≤ nitrogen ≤ 0.1%, 0 ≤ niobium ≤ 0.03%, 0 ≤ titanium ≤ 0.2%, 0% ≤ molybdenum ≤ 0.5%, 0% ≤ chromium ≤ 0.6%, 0% ≤ copper ≤ 2.0%, 0% ≤ nickel ≤ 3.0%, 0% ≤ calcium ≤ 0.005%, 0% ≤ boron ≤ 0.01%, 0% ≤ magnesium ≤ 0.005%, 0% ≤ zirconium ≤ 0.005%, 0% ≤ cerium ≤ 0.1%, the balance comprising iron and unavoidable impurities, said steel sheet having a microstructure comprising 45% to 90% ferrite and 10% to 55% austenite in area fraction, said austenite having an average grain size of 0.5 microns to 25 microns, and a residual austenite grain having an aspect ratio of 1 to 4.5.

The application belongs to the field of amorphous alloy preparation, and particularly relates to a titanium-based amorphous alloy which can be used for superplastic forming. a Er b Cr c Ni d Si e Be f ; wherein a represents the atomic percentage of Ti, 55<=a<=65; b represents the atomic percentage of Er, 9<=b<=13; c represents the atomic percentage of Cr, 15<=c<=22; d represents the atomic percentage of Ni, 4<=d<=8; e represents the atomic percentage of Si, 0<=e<=3; f represents the atomic percentage of Be, 0<=f<=8; and the sum of a, b, c, d, e and f is 100. The titanium-based amorphous alloy has a large supercooled liquid phase region, is not easy to crystallize when heated to the supercooled liquid phase region, and has superplasticity in the supercooled liquid phase region, so that the amorphous alloy is convenient to process and form.

This invention relates to the field of superplastic forming, and particularly to a method and apparatus for ultrasonic vibration-assisted superplastic forming of titanium alloys. Step S1: Select the vibration frequency of the ultrasonic generator according to the type, thickness, size, and forming shape of different titanium alloy sheets; adjust the vibration amplitude of the ultrasonic vibration; and generate a suitable ultrasonic vibration mode by changing the transducer or amplitude transformer. Adjust the heating temperature, heating time, and output pressure of the gas source system of the heating furnace. This invention incorporates ultrasonic vibration-assisted forming during the superplastic forming process of titanium alloys. Under the combined action of high-pressure argon gas and ultrasonic vibration, the high-temperature yield strength and flow stress of the titanium alloy sheet, which has reached superplasticity after heating, are reduced, shortening the superplastic forming cycle. Applying ultrasonic vibration during the forming process improves its mold adhesion, thereby increasing the contour accuracy of the formed parts and the yield rate of the finished products.