155 results about "Specific strength" patented technology

The invention belongs to the technical field of metal material engineering, and relates to a light high-toughness low-cost aluminum alloy and a preparation method thereof.The alloy comprises, by mass, 7.0%-9.2% of Mg, 2.5%-4.0% of Zn, 0.06%-0.20% of Zr, 0.01%-0.03% of Sb, main impurities including Fe smaller than or equal to 0.15%, Si smaller than or equal to 0.12%, other single impurities smaller than or equal to 0.05%, the total impurity smaller than or equal to 0.15% and the balance Al. Compared with 2xxx series and 7xxx series aluminum alloys, the alloy has certain advantages in the aspects of density, specific strength, ductility, corrosion resistance and the like, and has a remarkable cost advantage compared with a low-density aluminum-lithium alloy, so that the core competitiveness of an alloy product is improved, and the alloy product has the potential of becoming a next-generation commercial aluminum alloy.

The invention discloses an intelligent detection system and method for the fracture specific strength of cotton fibers, and relates to the technical field of cotton fiber detection, and the intelligent detection system for the fracture specific strength of the cotton fibers comprises a sampling module, an image acquisition module, a resistance measurement module, a strength measurement module and a central control module. The sampling module is used for sampling on a cotton fiber sample and constructing the sample into a to-be-detected cotton fiber bundle; the image acquisition module is used for acquiring image information of a to-be-detected cotton fiber bundle; the resistance measurement module is used for measuring resistance information of the to-be-detected cotton fiber bundle; the strength measurement module is used for snapping the to-be-detected cotton fiber bundle from a fracture area of the to-be-detected cotton fiber bundle and recording real-time tension information and displacement information of the fracture area; the central control module is in communication connection with the image acquisition module, the resistance measurement module and the strength measurement module. According to the invention, the detection of the cotton fiber fracture specific strength in a non-standard laboratory environment can be realized.

The invention relates to the technical field of metal materials, and discloses a light high-strength zinc alloy and a preparation method and application thereof.The zinc alloy takes aluminum and magnesium as main alloy elements, scandium-yttrium pre-alloying components, cerium-lanthanum composite rare earth and a nano TiB2 particle reinforced phase are introduced, and grain refinement and interface strengthening are achieved through the synergistic effect of multiple components; the preparation method comprises the key processes of pre-alloy smelting, dynamic magnetic field assisted die casting, gradient aging treatment and the like, and the defects of melt oxidation and solidification are effectively controlled. The zinc alloy has low density, high specific strength, corrosion resistance and excellent surface treatment adaptability, is suitable for manufacturing of precise metal fasteners such as belt buckles, belt buckles and shoe buckles, can remarkably improve the anti-fatigue performance and appearance quality of products, meanwhile, reduces processing energy consumption and material loss, and meets the market requirements of light-weight and high-end hardware fittings.

The present invention discloses a carbon fiber matrix composite structure grinding wheel and a manufacturing method thereof. The carbon fiber matrix composite structure grinding wheel comprises a carbon fiber matrix, a grinding wheel piece and a monofilament pre-tightening cloth. The grinding wheel piece is sleeved on the carbon fiber matrix, and the two are bonded by gluing. The monofilament pre-tightening cloth is wound on the carbon fiber matrix. The carbon fiber matrix composite structure grinding wheel of the present invention solves the problems of large mass, low specific strength and modulus, large inertia and poor vibration resistance of existing metal grinding wheels; the present invention also discloses a manufacturing method of a carbon fiber matrix composite structure grinding wheel, by which a carbon fiber matrix composite structure grinding wheel can be manufactured.

The invention discloses an epoxy resin-based composite material with vibration damping performance and a preparation method and application thereof, and belongs to the technical field of carbon fiber reinforced composite materials. The carbon fiber reinforced epoxy resin matrix composite material is prepared from the following raw materials in parts by weight: 80-120 parts of epoxy resin, 10-50 parts of a curing agent and 5-10 parts of carbon nanotube / molybdenum disulfide and micron rubber co-embedded damping particles. The epoxy resin-based composite material disclosed by the invention is simple in raw materials, can be commercialized, and meets the low-altitude economic development requirements and the application requirements of aviation aircrafts; and the composite material has high specific strength, high damping vibration attenuation performance, electrical insulation performance and the like, and has a good application prospect in preparation of aircraft skin parts.

The invention discloses an ultrathin / broadband / bearing wave-absorbing honeycomb sandwich multilevel structure and a preparation method thereof. The ultrathin / broadband / bearing wave-absorbing honeycomb sandwich multilevel structure is formed by connecting unit bodies of rectangular structures. Each unit body comprises a reflecting plate, a square hole honeycomb core body and a metasurface, the square hole honeycomb core body is made of a functional fiber reinforced composite material, and the reflecting plate is made of a carbon fiber composite material; wherein the metasurface and the reflecting plate are arranged on the upper surface and the lower surface of the core body respectively, the square hole honeycomb core body comprises an external square hole and a honeycomb arranged in the square hole, and the inner surface of the square hole is provided with a coating; a lattice structure made of a thermoplastic material is arranged in the honeycomb in the square hole, and the metasurface is a periodic array pattern and is made of a conductive carbon-based nano material; and each unit body is connected with the adjacent unit body in a clamping groove interlocking manner. The broadband electromagnetic absorption effect within the frequency band of 4-40 GHz is achieved, meanwhile, the high specific strength and specific stiffness of the whole sandwich structure are achieved, and an efficient way is provided for achieving a high-performance electromagnetic function structure.

The utility model discloses a composite material support with a C-shaped cross section and a negative angle and a forming die thereof, the composite material support comprises a body with a C-shaped cross section, the body comprises an upper plate, a middle plate and a lower plate, one edge of the upper plate is connected with the upper edge of the middle plate into a whole, the lower edge of the middle plate is connected with one edge of the lower plate into a whole, and the lower plate is connected with the lower plate into a whole. A C-shaped structure is defined by the upper plate, the middle plate and the lower plate, an integrated rectangular frame is defined after a C-shaped opening of the body faces outwards, the upper plate on the two opposite edges of the rectangular frame is of a negative angle structure, namely the upper plate inclines outwards and downwards, so that the included angle between the upper plate and the middle plate is an acute angle, and the lower plate and the middle plate form a right angle. The upper plates and the middle plates of the other two opposite frames of the rectangular frame are perpendicular, and the lower plates and the middle plates are perpendicular. The composite material support is low in machining cost and high in specific strength and specific stiffness.

The invention discloses an aluminum alloy material for a current-carrying friction pair and a preparation method of the aluminum alloy material, and belongs to the technical field of alloy materials. The aluminum alloy provided by the invention comprises the following components in percentage by weight: 5-10% of Cu, 0-0.3% of Sc, 0.2-0.6% of Zr and the balance of Al and inevitable impurities. The preparation method comprises the following steps: S1, weighing raw materials, and pretreating for later use; s2, raw materials are smelted and degassed, and alloy melt is obtained; s3, the alloy melt is poured into a die casting machine for die casting; and S4, the die casting is sequentially subjected to solution treatment and aging treatment and then is air-cooled to the room temperature, and the die casting is obtained. The prepared aluminum alloy material has the beneficial effects of being good in casting performance, high in specific strength, hardness, conductivity and current-carrying wear resistance and the like, and the requirement for serving as a current-carrying friction pair material of a high-speed train is met.

The application belongs to the field of high-entropy alloys, and particularly relates to a preparation method of an ultra-high strength and plasticity product Fe50Mn30Co10Cr10 alloy. Firstly, a cast slab is prepared through vacuum induction melting, then the cast slab is subjected to multi-pass hot rolling with a reduction ratio of 70% to 75%, and after pickling, the cast slab is subjected to multi-pass warm rolling with a reduction ratio of 80%, and finally, high-temperature short-time annealing is carried out at 1050 to 1150 DEG C to obtain a final annealing plate. In the application, the phase transformation behavior in the alloy deformation process is inhibited by controlling the hot rolling and warm rolling temperatures, and the rolling plasticity of the material is improved. Meanwhile, by optimizing the annealing process, the grains are refined as much as possible, and a certain dislocation density is retained, and the strength and plasticity of the alloy are improved through the comprehensive action of multiple strengthening mechanisms. The prepared Fe50Mn30Co10Cr10 alloy has a tensile strength of 1050 to 1280 MPa, an elongation of 35% to 58%, and a strength and plasticity product of 40 to 73 GPa.

The invention discloses a vertical-horizontal mixed enhanced selective laser melting lattice structure based on a face-centered cube (FCC) and a preparation method of the vertical-horizontal mixed enhanced selective laser melting lattice structure. According to the method, starting from a basic FCC lattice unit, firstly, an in-plane enhanced transition lattice structure FCC-H (FCC-Horizon) is formed through a crossed structure of an inclined main rod and an auxiliary rod perpendicular to the main rod; the secondary auxiliary rods are distributed in a radial mode to construct a continuous bridging grid by further optimizing the rod piece connecting mode and the diameter proportion, and finally the vertical-horizontal mixed enhanced FCC-VH (FCC-Vertical Horizon) lattice structure is obtained. According to the structure, through the synergistic effect of the inclined main rods and the auxiliary rods perpendicular to the main rods, the compressive strength, the specific stiffness, the specific strength and the specific energy absorption of the structure are remarkably improved while the light weight is kept. According to an experiment, 316L stainless steel powder is adopted, an FCC-VH lattice structure is prepared through a selective laser melting (SLM) technology, the compression deformation mode of the FCC-VH lattice structure is converted into multi-node cooperative bearing from local buckling of a basic FCC, and the overall compression performance is more remarkably improved.

The present invention discloses a heterogeneous metal laminated composite armor and a preparation method thereof, comprising the following steps: A. Prepare different heterogeneous metal elements respectively and stack them along the thickness direction; B. Vacuum package the periphery of the interface of the stacked heterogeneous metal elements; C. Achieve metallurgical bonding of the heterogeneous metal interfaces through stacked forging and heat preservation diffusion treatment; D. Obtain a heterogeneous metal laminated composite armor with specific specifications through forging and precision rolling. The present invention uses a high-strength metal as the face plate and a high-toughness metal as the back plate, and at least one of the two metals is a high specific strength material. Through stacked forging and heat preservation diffusion treatment, strong metallurgical bonding is achieved at the heterogeneous metal interfaces, and combined with subsequent forging and precision rolling processes, a lightweight metal composite armor plate with excellent anti-ballistic performance is prepared, improving the anti-multi-projectile strike ability and comprehensive protection performance of the armor, and solving the problem of weak interfacial bonding strength of heterogeneous materials.

The invention discloses an automatic temperature control composite material storage device for an aircraft, which belongs to the technical field of aircraft storage and transportation and comprises a storage device body, a split air conditioner, a temperature control system and an internal aircraft trailer. The storage device body is made of a composite material, the specific strength is high, light weight is achieved, and the effective transportation load is improved; an aerogel layer is added to a composite interlayer of the device, so that the passive heat preservation capacity of the device is greatly improved; the split type air conditioner is arranged and can work under the working condition that the air pressure in the storage device is positive pressure, and the air tightness in the device is guaranteed; the temperature control system has high environmental adaptability, can provide good mechanical and natural environments for the aircraft, and has the advantages of automatic temperature control, light weight, high environmental adaptability, excellent air tightness and the like.

The invention relates to the technical field of transmission shaft machining, in particular to a kinetic energy transmission shaft body and a machining process integrating pultrusion, weaving, winding and glue injection, the kinetic energy transmission shaft body comprises a shaft body, the shaft body is formed by winding a continuous composite material reinforced thermosetting resin prepreg tape, and a composite material comprises a reinforcing material, a base material, a functional additive and filler; a plurality of limiting grooves are formed in the inner wall of the shaft body, the limiting grooves extend in the axial direction of the shaft body, the length of the limiting grooves is consistent with that of the shaft body, and pultrusion, weaving, winding and glue injection processes are organically integrated, so that the manufactured kinetic energy transmission shaft body has high specific strength, high torsional rigidity, excellent interlayer bonding performance and good dynamic stability; meanwhile, a limiting groove can be precisely machined in the inner wall of the shaft body, the high-precision torque transmission requirement is met, and the defects that a traditional metal shaft body is heavy and prone to corrosion and layers of a single composite material shaft body are prone to layering are overcome.

The present invention discloses a process and a plate for three-dimensionally weaving a plate with channels, comprising: arranging yarns on a three-dimensional weaving base according to the shape of the plate, not arranging yarns in the empty positions of the channels, and weaving the plate with channels in three dimensions according to a four-step method. In the present invention, a three-dimensional weaving plate with channels is made using three-dimensional weaving technology. This plate has good structural integrity and strong load-bearing performance. It will not delaminate after being subjected to force. The design of its channels can reduce the weight of the plate while also having the function of thermal insulation. Furthermore, the shape, arrangement, and number of the channels in the present invention can be designed according to the working conditions of the product, which is conducive to reasonably improving the mechanical contribution rate of the fiber. The plate with channels of the present invention has high specific strength and high specific modulus, and can be matched with the selection of materials to meet the needs of aerospace, rail transportation, sports and leisure, construction and other fields for different composite material plates.

According to the high-toughness superstructure manufacturing method based on gradient bionic spiral construction, a composite material superstructure with the excellent mechanical property is constructed through the synergistic effect of gradient bionic spiral laying layer design and a Z-pin anchoring technology, in a gradient bionic spiral laying layer, the spiral angle changes in a gradient mode, Z-pin anchoring penetrates through a composite material laminated plate, and the Z-pin anchoring technology is used for anchoring the composite material laminated plate. According to the manufacturing method, a three-dimensional reinforced network is formed, the interlayer strength and impact resistance are remarkably improved, the high-toughness superstructure is manufactured through an autoclave forming process, cooperative reinforcement of gradient bionic spiral construction and a Z-pin anchoring effect is achieved, and the prepared superstructure has high specific strength, high toughness and excellent layering resistance.

The application discloses a high specific strength high-elongation 6-series aluminum alloy anti-collision beam, which comprises a base, the upper side walls of the base are symmetrically fixedly connected with vertical plates, the opposite sides of the two vertical plates are fixedly connected with support plates, the upper side walls of the two support plates are fixedly connected with a smelting furnace, a stirring mechanism is arranged on the smelting furnace, a feeding port is formed in the upper side wall of the smelting furnace, and arc-shaped blocks are arranged on the inner bottom wall of the smelting furnace. The anti-collision beam combines the advantages of 6082 alloy and 7003 alloy, has good extrusion forming performance, the strength is greater than 340 MPa, the elongation is greater than or equal to 15%, and the elongation is improved by more than 10% compared with the 6082 alloy. The rare earth rhenium is added to refine the grains and improve the alloy strength, and the 6-series profile is subjected to double-stage aging strengthening, so that the elongation of the alloy is further improved.

The application discloses a preparation method of a high-temperature / high-strength / high-toughness heterogeneous structure Ti6Al4V alloy, which takes a Ti6Al4V alloy forge piece as a matrix, takes Ti6Al4V alloy powder and Ti6.5Al3,5Mo1,5Zr0.3Si alloy powder as deposition materials, controls the alloy powder output by adjusting the rotating speed of a powder feeding barrel, continuously changes the Ti6.5Al3,5Mo1,5Zr0.3Si mass percentage doped into the Ti6Al4V powder in the thickness direction, and prepares a symmetric gradient heterogeneous structure titanium alloy by laser deposition. The application fully utilizes the high specific strength of the Ti6Al4V alloy and the high-temperature characteristics of the Ti6.5Al3,5Mo1,5Zr0.3Si alloy, and the heterogeneous structure Ti6Al4V alloy prepared by the method has excellent tensile strength and impact toughness. The application is suitable for the preparation process of the 3D printing heterogeneous structure Ti6Al4V alloy which is easy to realize.

The invention discloses a nanopore dispersion strengthened metal material and a preparation method thereof, and belongs to the field of metal structure materials and porous materials. The nanopore dispersion strengthened metal material has the following characteristics that the metal comprises but is not limited to pure metal such as gold, platinum, silver, nickel, aluminum and copper and alloy materials of two or more of the pure metal; a single hole is a closed hole and is not communicated with the outside and other holes; the size between two farthest points on the surface of a single hole is larger than or equal to 1 nanometer and smaller than or equal to 1 micrometer; and the overall porosity is between 1% and 14%. The nanopore dispersion strengthened metal material disclosed by the invention can be prepared by a dealloying-compressing-sintering process. The nanopore dispersion strengthened metal material can achieve the purposes of weight reduction, strengthening and even plastic toughening at the same time without alloying, has very high specific strength, is a high-performance light structural material, and is expected to be applied to the engineering fields of aerospace and the like in the future.

This invention discloses a structural strength optimization method based on a triangular fractal algorithm, relating to the field of structural optimization design in civil engineering. The method includes the following steps: Ⅰ. Setting the geometric and material parameters of initial members and calculating their buckling critical load and specific strength; Ⅱ. Setting the geometric and material parameters of the reinforced members in the first iteration and calculating their buckling critical load and specific strength after iteration; Ⅲ. In each iteration, changing the radius of the added members, calculating the maximum specific strength of the triangular fractal structure in each iteration, and recording the corresponding member radius. The fractal structure generated after multiple iterations of this invention can withstand greater loads and has higher strength. It maintains increased strength even with further increases in the number of iterations, making the structure less prone to failure. The fractal structure generated after multiple iterations can withstand greater loads and has higher strength, which is helpful for optimizing engineering solutions.

The invention provides a carbon fiber rubber-coated roller and a wire cutting machine. The carbon fiber rubber-coated roller comprises a carbon fiber tube body, the shaft seats are arranged at the two ends in the carbon fiber tube body, and the shaft seats are combined with the carbon fiber tube body through fixing structures; each shaft seat is connected with one shaft core, and one end of each shaft core extends to the outside of the carbon fiber tube body; and the working layer covers the outer part of the carbon fiber pipe body. The carbon fiber rubber-coated roller has the advantages that compared with an existing roller made of a metal material, the whole carbon fiber rubber-coated roller is lighter in overall weight, the energy consumption of the carbon fiber rubber-coated roller in the working process can be remarkably reduced, and the carbon fiber rubber-coated roller has higher specific strength and specific modulus; the light weight of the product can be ensured under the condition of the same strength, and the strength of the product can be higher under the condition of the same weight; and meanwhile, the product also has good water resistance, rust resistance, temperature resistance and low possibility of deformation, and is good in stability.

The present invention discloses a combustible casing for an underground coal gasification channel and a preparation method thereof, belonging to the technical field of petroleum industry pipe manufacturing. The preparation process of the combustible casing is simple. The combustible casing is composed of 0.2-1.0Zr, 1.0-5.0Zn, 1.0-5.0Al, 7.0-13.0Gd, 3.0-6.0Y, 3.0-6.0Nd, and the remainder being Mg and impurities in mass percentage. After being cast and turned into an ingot, the ingot is solution treated and extruded, and then subjected to aging treatment. Finally, the combustible casing is prepared, which has sufficient space for normal operation and has the characteristic of being burned and consumed above a specific temperature. The casing has a rationally designed alloy element composition, low density, high specific strength, excellent room temperature and high temperature strength, and the characteristics of being burned and consumed above the specific temperature.

The invention relates to a composite rudder sheet for an aircraft and a forming method of the composite rudder sheet, and belongs to the technical field of composites.The composite rudder sheet comprises a base layer, an upper structural layer, a lower structural layer and a metal piece; the matrix layer is made of chopped carbon fiber prepreg; the upper structural layer and the lower structural layer are both made of carbon fiber unidirectional belt prepreg; the metal piece is made of 7075 aluminum alloy or 7050 aluminum alloy; according to the technical scheme, the reinforcing material is obtained by combining the organic compound with the silanized composite material; combining the reinforcing material with diethanol amine to obtain a hyperbranched polymer; mixing the hyperbranched polymer with the composite epoxy resin, and then adding a curing agent to obtain modified epoxy resin; impregnating the short carbon fibers with the modified epoxy resin to obtain a short carbon fiber prepreg; impregnating the carbon fiber unidirectional belt with the modified epoxy resin to obtain a carbon fiber unidirectional belt prepreg; the specific strength and the specific modulus of the composite material ostrich section are improved on the whole, the overall weight of the composite material ostrich section is reduced, and the comprehensive performance of the composite material ostrich section is improved.

The application relates to the field of fiber preparation, and discloses a kind of ultra-high molecular weight polyethylene fibers with adsorption and its preparation method and application, the raw material of the ultra-high molecular weight polyethylene fiber prepared includes ultra-high molecular weight polyethylene powder, antioxidant and filler;Wherein, the antioxidant is 0.2-1wt% of the ultra-high molecular weight polyethylene powder, and the filler is 0.5-3wt% of the ultra-high molecular weight polyethylene powder;Wherein, the filler is obtained by reacting metal salt and polybasic acid organic ligand dissolved in a first solvent, using the technical scheme provided by the application, the ultra-high molecular weight polyethylene powder has good corrosion resistance, the adsorption performance of ultra-high molecular weight polyethylene is improved by filler, the ultra-high molecular weight polyethylene fiber with adsorption is prepared, the specific strength is high, the specific modulus is high, and the adsorption capacity is as high as 200-600mg / g.

The present invention discloses a lightweight, high-strength, high-energy-absorbing porous TWIP steel and a preparation method thereof. High-purity metal Fe, Mn powder and high-purity graphite are weighed and mixed in a certain proportion, and then mechanical alloying (MA), pore formation and high-temperature sintering are performed in sequence to obtain porous structure TWIP steel with different pore sizes and porosities. The alloy has the characteristics of light weight, high specific strength and high energy absorption, and can be used as a new generation of impact-resistant, buffering and energy-absorbing materials in many fields. At present, the research and development of porous metals mainly focuses on aluminum, copper, titanium, magnesium, nickel alloys, stainless steel, etc., and there are almost no reports on the porous preparation of TWIP steel. The present invention adopts a formed powder sintering method, and utilizes MA combined with pore formation and high-temperature sintering to realize the direct preparation of lightweight porous TWIP steel with controllable pore size and porosity. The unique TWIP effect and high work hardening ability of TWIP steel are utilized to obtain a higher specific strength and extremely high buffering and energy-absorbing ability.

The present invention provides an amorphous porous aluminum alloy material, a preparation method and an application thereof. The composition of the amorphous porous aluminum alloy material is Al 70 (CuCo x ) 20 (TiCo y )9(Sc / Er)1, where x is from 1 to 4 and y is from 1 to 2. A plurality of holes are uniformly distributed inside, the diameter of the holes is 400 - 700 μm, the porosity is 45 - 60%, and the density is 1.6 - 2.0 g / m 3 . The amorphous porous aluminum alloy material has a metal matrix composite foam preparation process with strong designability and a low error tolerance rate in the production process. It not only has a high density and porosity, but also the hole sizes are relatively uniform. It can absorb energy through the collapse of dense holes, and thus has a high impact absorption and buffer protection function. Moreover, the dense holes can increase the thermal resistance of the interface, reduce the heat conduction performance, and at the same time have a low density and excellent mechanical properties such as specific strength and specific stiffness.

The invention discloses a polymer alloy plastic bridge and a preparation method thereof, and relates to the technical field of cable bridges, the polymer alloy plastic bridge comprises a main groove body, the main groove body is integrally formed by a bottom and two side plates, the bottom and the two side plates of the main groove body are each of a three-layer composite structure, the top of the main groove body is detachably connected with a cover plate through a buckle assembly, and the cover plate is detachably connected with the bottom of the main groove body. The three-layer composite structure sequentially comprises an alloy plastic base plate, a honeycomb-shaped reinforcing rib layer and a stainless steel plate from outside to inside. Through the design of the three-layer composite structure, the performance is synergistically enhanced, compared with a traditional plastic bridge, the weight is reduced by 30% or above, the bending strength is improved by 50%, the three-layer structure is firmly combined through the co-extrusion-mold pressing-bonding technology, the limitation of a bridge made of a single material on strength, weather resistance or weight is solved, and the service life of the bridge is prolonged. The structure has high specific strength and specific stiffness, the weight of the bridge can be effectively reduced while the overall strength of the bridge is guaranteed, installation and transportation are convenient, and the construction cost is reduced.

The present invention belongs to the technical field of metal materials, and particularly relates to a Cr-Fe-Mn-Ni-Al series high-specific-strength multi-scale structure high-entropy alloy and a preparation method thereof. The general formula of the alloy is Cr a Mn b Fe c Ni d Al e , a, b, c, d, e are molar ratios, a+b+c+d+e=100%. The present invention also discloses a method for preparing a high-specific-strength high-entropy alloy with a multi-scale structure, comprising distributing high-purity raw materials, evacuating and filling a certain amount of high-purity argon gas, and performing multiple arc melting to obtain the desired alloy. The alloy of the present invention has the characteristics of low density, high high-temperature hardness and high high-temperature specific strength. The higher the Al content, the higher the high-temperature strength and specific strength, which is better than the traditional Inconel 718 nickel-based alloy, and provides selection support for new high-temperature structural materials.

The invention discloses a preparation method capable of reducing the grain size and segregation layer of a 6-series alloy, and relates to the technical field of metal material preparation, the preparation method comprises the following specific steps: S100, preparing raw materials; weighing an aluminum ingot, a pure magnesium ingot and a ferrosilicon alloy according to the standard components of the 6-series alloy by using an electronic analytical balance, wherein the weighing error of each raw material is + / -0.01%; through the magnetic field constraint solidification technology, the alternating magnetic field with the specific strength and frequency is applied in the 6-series alloy solidification process, alloy grains are effectively refined, formation of a segregation layer is reduced, limitation of the traditional solidification technology is broken through, uniform distribution of solute atoms is promoted through the magnetic field effect, and the alloy quality is improved. Therefore, the overall uniformity and the mechanical property of the alloy are improved, the precise control and the high uniformity of the magnetic field intensity are ensured by combining the magnetic field constraint solidification with the superconducting magnet, and a reliable means is provided for microstructure optimization of an alloy material.

The invention provides a manufacturing and performance verification method of a spray-formed aluminum alloy forge piece for a helicopter, and the method comprises the following steps: carrying out spray forming on uniformly mixed metal powder to obtain a spray-formed aluminum alloy ingot blank; carrying out extrusion hot processing on the spray-formed aluminum alloy ingot blank; forging the ingot blank subjected to extrusion hot processing; the forged forge piece is subjected to heat treatment; and carrying out performance verification on the forged piece subjected to heat treatment. The spray-formed aluminum alloy forge piece manufactured based on the method can meet the weight reduction design requirements of typical bearing frames and other parts of helicopters, structural weight reduction is achieved, and the development requirements of ultra-light structures and high specific strength are met.

The application discloses an insect exoskeleton morphological layup composite panel, a sandwich structure and a preparation method. The sandwich structure comprises two pieces of bionic layup composite panels and a piece of aramid honeycomb core layer. The bionic layup composite panel draws lessons from the spiral stacking microstructure of the insect exoskeleton, the layup design considers the symmetry and balance requirements of the composite material, a fixed rotation angle is introduced between adjacent fiber layers, and the rotation angle is taken as a period of 180 degrees, and after a plurality of periods are laid and heat-pressed and cured, the bionic layup composite panel is obtained. The bionic layup design effectively reduces the interlaminar shear stress of the composite material, weakens the inherent anisotropy of the composite material, and improves the transverse bearing capacity and impact resistance. The bionic layup composite panel and the aramid honeycomb core layer have the advantages of high specific strength, high specific stiffness, impact energy absorption, vibration and noise reduction, electromagnetic shielding and the like, and a structure and function integrated material with more excellent comprehensive performance is obtained, and the structure and function integrated material is expected to be widely used in main load-bearing structures of various spacecrafts.