2218 results about "Ta element" patented technology

The invention relates to the technical field of aluminum alloy, in particular to a high-strength corrosion-resistant aluminum alloy material and a preparation method and application thereof.The high-strength corrosion-resistant aluminum alloy material comprises, by weight, 4.5%-8.5% of Mg, 3.5%-5.5% of Zn, 0.8%-1.6% of Cu, at least two of the following elements with the total content not larger than 0.5%: 0.05%-0.15% of Mn, 0.05%-0.15% of Cr, 0.05%-0.12% of Ti, 0.06%-0.16% of Sc, 0.08%-0.14% of Er, 0.06%-0.12% of Zr and the balance Al and inevitable impurities. The total content of the impurities does not exceed 0.4%, and the balance is Al. Wherein the mass ratio of Mg to Zn is 1.1-2.0, when Sc and Zr exist at the same time, (Sc + Zr) is larger than or equal to 0.15% and smaller than or equal to 0.2%, when Er and Zr exist at the same time, (Er + Zr) is larger than or equal to 0.16% and smaller than or equal to 0.24%, and each impurity element is smaller than or equal to 0.15%. The exfoliation corrosion, stress corrosion and salt spray corrosion performance of the alloy is greatly improved by controlling the content and mass ratio of all the elements, and the exfoliation corrosion performance of the alloy is not lower than the P level; in a slow strain rate tensile test in saline water, the attenuation proportion of the elongation is not greater than 9% compared with that of an inert medium, and good stress corrosion cracking resistance is shown; in a 960h neutral salt spray corrosion test, the average corrosion rate is not greater than 0.1 g / (m < 2 >. H).

The invention relates to the technical field of aluminum alloys, in particular to a high-strength light aluminum alloy and a preparation method and application thereof. The aluminum alloy comprises the following chemical components in percentage by weight: 3.5 to 6.5 percent of Mg, 2.5 to 5.0 percent of Zn, 0.2 to 1.0 percent of Cu, 0.1 to 0.4 percent of Mn, 0.05 to 0.25 percent of Zr, 0.05 to 0.25 percent of Sc, 0 to 0.12 percent of Fe, 0 to 0.12 percent of Si and the balance of Al and inevitable impurity elements. Wherein the mass ratio of Mg to Zn is 1.0-2.0, the total content of Mn, Zr and Sc does not exceed 0.5%, the total content of Zr and Sc does not exceed 0.38%, and the mass ratio of Zr to Sc is 0.6-1.5. By accurately controlling the contents and proportions of elements such as Mg, Zn, Cu, Mn, Zr, Sc and the like, perfect combination of high strength and light weight of the alloy is realized. The density of the alloy is smaller than or equal to 2.72 g / cm < 3 >, the yield strength is larger than or equal to 350 MPa, the tensile strength is larger than or equal to 450 MPa, the ductility is larger than or equal to 10%, the welding coefficient is not smaller than 0.75, and the exfoliation corrosion performance is not lower than the EA level.

The invention relates to the technical field of alloy coatings, and discloses a laser cladding high-entropy alloy coating and a preparation method thereof.The laser cladding high-entropy alloy coating is prepared from, by mass, 25%-45% of Fe, 15%-25% of Cr, 10%-20% of Ni, 5%-15% of Mn, 3%-10% of Al, 0%-5% of Ti, 1%-5% of a nanometer reinforcing phase and 0.1%-0.5% of a flow promoter. Lorentz force generated by an alternating electromagnetic field drives melt convection, so that the diffusion coefficient of segregation-prone elements such as Cr and Ni is increased, the ultrasonic cavitation effect is matched to crush dendritic crystals and promote dispersion of nanoparticles, the segregation index of the elements is reduced, a uniform nanocrystalline-amorphous composite structure is formed through the synergistic effect, and uniform distribution of elements in a molten pool is achieved.

The invention relates to a 5xxx series aluminum alloy additive part and a preparation method thereof, relates to the technical field of additive materials, and aims to solve the problem of urgent development of a process capable of effectively improving the strength of the 5xxx series aluminum alloy additive part without any subsequent treatment. According to the main technical scheme, the preparation method of the 5xxx-series aluminum alloy additive part comprises the following steps that 5xxx-series aluminum-magnesium-based aluminum alloy powder and CNT are subjected to powder mixing treatment, and composite powder is obtained; wherein in the 5xxx series aluminum-magnesium-based aluminum alloy powder, the mass fraction of the Mg element is larger than 4% and not larger than 12%, the mass fraction of the Si element is smaller than 0.4%, and the mass fraction of the Cu element is smaller than 0.2%; in the composite powder, the mass fraction of the CNT is greater than 0.5% and not higher than 5%; the composite powder is formed into a blank, and the blank is made into a bar; and the bar is subjected to friction extrusion deposition treatment, and the 5xxx series aluminum alloy additive part is obtained. The method is used for preparing the 5xxx series aluminum alloy additive part with excellent tensile strength and yield strength, and subsequent heat treatment is avoided.

The invention discloses a hydrogen evolution electrode for an AEM electrolytic cell cathode and a preparation method thereof, the electrode sequentially comprises a substrate net, a metal bottom layer and a catalyst layer, the substrate net is selected from a stainless steel net or a nickel net, the metal bottom layer is formed on the substrate net through physical vapor deposition, and the material is selected from Ni, Ti, alloys thereof or oxides thereof; the catalytic layer is deposited on the metal bottom layer through physical vapor deposition and sequentially comprises a catalytic bottom layer, a catalytic middle layer and a catalytic outer layer, and the porosity is gradually increased. The preparation method comprises the following steps: roughening the acid etching surface of a substrate net, forming a metal bottom layer on the substrate net through physical vapor deposition, sequentially forming a catalytic bottom layer, a catalytic middle layer and a catalytic outer layer on the surface of the metal bottom layer through physical vapor deposition to obtain a catalytic layer, and performing post-treatment on the catalytic layer through plasmas doped with elements to form a porous network structure. And the corrosion resistance and the catalytic effect of the AEM electrolytic cell cathode in an alkaline environment are greatly improved.

The invention provides an aluminum alloy material, a preparation method thereof and a cable. The aluminum alloy material is prepared from the following components in percentage by mass: 0.03 percent to 0.06 percent of Si, 0.80 percent to 1.2 percent of Fe, 0.15 percent to 0.25 percent of Cu, 0.005 percent to 0.03 percent of B, 0.001 percent to 0.02 percent of Ti, 0.05 percent to 0.15 percent of Y, 0.08 percent to 0.2 percent of the total mass of La and Ce and the balance of Al. The specific content of Fe is added into the aluminum alloy material and cooperates with the rare earth elements Y, La and Ce, and the elongation at break of the aluminum alloy material is improved; meanwhile, due to the addition amount of the Y element, the fatigue resistance of the material is further improved, the toughness of the material is improved, and the heat resistance and cold resistance of the material can be improved. A specific content of boron element is added to form nuclear particles, so that the effect of refining grains is achieved, and the tensile strength of the aluminum alloy material is improved; and meanwhile, the resistivity of the aluminum alloy material is further reduced through cooperation of the boron element and other components. And the titanium element can also play a role in refining grains, so that the tensile strength of the material is further improved. The cable prepared from the aluminum alloy material can meet the requirement of a cable torsion experiment.

The invention provides a high-strength and high-conductivity copper alloy with a fine grain structure and a preparation method of the high-strength and high-conductivity copper alloy, and belongs to the technical field of copper alloy preparation. The copper alloy comprises the following elements in percentage by mass: 2.0-12.0 wt.% of Ni, 0.4-3.0 wt.% of Si, less than or equal to 1.0 wt.% of Zn, less than or equal to 5.0 wt.% of Ti, less than or equal to 1.0 wt.% of B and the balance of Cu and inevitable impurities. According to the method, the heat treatment process is adjusted, generation of Ni16Ti6Si7 and TiB2 phases is promoted through introduction of Ti and B elements, micron-sized particles can serve as nucleation sites and pinning grain boundaries in the heat deformation process, and grain refinement is promoted. The high-strength and high-conductivity copper alloy with a fine grain structure is obtained by changing the content of Ti and B elements in the copper alloy and regulating and controlling the proportion of Ni16Ti6Si7, a TiB2 micron phase and a Ni2Si nano phase.

The invention belongs to the technical field of single crystal alloys, and particularly relates to a Ni3Al-based single crystal alloy and a preparation method and application thereof. The Ni3Al-based single crystal alloy provided by the invention comprises the following element components in percentage by mass: 7.0 to 8.2 wt.% of Al, 2.4 to 3.8 wt.% of Ta, 7.9 to 9.8 wt.% of Mo, 1.5 to 3.6 wt.% of Re, 0.9 to 1.8 wt.% of Cr and the balance of Ni, the Ni3Al-based single crystal alloy comprises a gamma '-Ni3Al phase and a gamma-Ni phase. According to the invention, the contents of Al and Ta elements are increased, so that a gamma '-Ni3Al phase and a gamma-Ni phase are formed in the alloy; mo is used for replacing part of Re, the temperature bearing capacity of the single crystal alloy is improved through high-mismatch-degree alloying design, meanwhile, the cost of the alloy is remarkably reduced, and the endurance life is longer than 150 h under the conditions of 1200 DEG C and 80 MPa.

The invention discloses a nuclear zirconium alloy cladding high-temperature oxidation resistant composite coating and a preparation method thereof, and belongs to the technical field of nuclear zirconium alloy coatings. According to the preparation method disclosed by the invention, through component gradient structure design, Cr ion pretreatment activation, deposition of a pure Cr inner coating, deposition of a Cr70Al30 intermediate coating and deposition of a Cr50Al50 outer coating are sequentially carried out on the surface of a nuclear zirconium alloy cladding, and the Cr-Cr70Al30-Cr50Al50 composite coating zirconium alloy cladding with a three-layer structure is obtained. According to the method, outward migration of the Al element is effectively limited while the excellent anti-oxidation characteristics of the Cr and Al elements are fully utilized, the coating has the excellent high-temperature oxidation performance, and the requirement for the service performance of the surface coating of the zirconium alloy cladding at the extremely high temperature is met.

This invention discloses a non-heat treatable die-cast aluminum-silicon (Al—Si) alloy with high toughness and its preparation method. By controlling the Mn / Fe ratio to a specific value, the adverse effects of Fe in the alloy can be effectively suppressed. In addition, a certain proportion of rare earth elements are introduced into the alloy to effectively refine the Si and form high-temperature phases with elements such as Al and Cu, therefore improving the deformation resistance of the alloy when applied to one-piece die-cast large-scale structural parts. When taking specimens from the casting after die casting for testing, the specimens have the following properties: tensile strength 290 Mpa, yield strength 140 Mpa, and elongation 13%. The alloy also has excellent die-cast molding performance, and the energy used is clean, which meets low-carbon emission standards.

The invention provides an anodic oxidation die-casting aluminum alloy and a preparation method thereof. The anodic oxidation die-casting aluminum alloy comprises the following elements in percentage by mass: 2-4% of Mg element, 0.2-2% of Si element, 1.6-2.4% of Mn element, 0.2-0.3% of Cu element, less than or equal to 2% of Zn element, less than or equal to 0.2% of Fe element, less than or equal to 0.2% of inevitable impurities and the balance of Al, wherein the sum of the mass content of the Mg element and the mass content of the Zn element is 2-4%; the surface chromatic aberration of the anodic oxidation die-casting aluminum alloy is lt; the white brightness L is larger than or equal to 85, the tensile strength ranges from 180 MPa to 210 MPa, the yield strength ranges from 80 MPa to 120 MPa, and the elongation ranges from 3% to 5%. The anodic oxidation die-casting aluminum alloy has excellent flowability and surface glossiness, and is good in surface quality and high in yield.

The invention relates to a method for driving impurity iron to enrich and purify aluminum alloy return scrap and a product, the aluminum alloy return scrap is placed in a crucible, is heated in a resistance furnace and is subjected to heat preservation for a period of time, so that the return scrap is fully molten, and a melt is obtained; continuously preserving the heat of the melt, connecting two parallel electrodes with a pulse power supply, vertically inserting the two parallel electrodes into the melt, and preheating for a period of time; setting a first pulse voltage, a first pulse current and a first pulse frequency according to the impurity iron content of the aluminum alloy return scrap; second pulse voltage, second pulse current and second pulse frequency are set according to different heat preservation temperatures during melt electric pulse treatment, and electric pulse treatment is applied to the melt for a period of time in the heat preservation stage; and closing the resistance furnace and the pulse power supply after treatment, and cooling the melt along with the furnace to obtain a sample. The method effectively solves the problem of malignant accumulation of impurity iron elements in the aluminum alloy resource recycling process. The method is short in treatment time and high in iron removal efficiency, and the production cost can be greatly reduced.

A ferrite-austenite duplex stainless steel material having a composition containing, by mass, 0.001 to 0.050% of C, 0.01 to 0.50% of Si, 1.0 to 4.5% of Mn, 0.050% or less of P, 0.030% or less of S, 1.5 to 3.5% of Ni, 19.6 to 24.0% of Cr, 0.01 to 1.00% of Mo, 0.01 to 1.20% of Cu, 0.010 to 0.090% of N, less than 0.130% of C + N, and the balance of Fe and impurities. The ferrite-austenite duplex stainless steel material has a metal structure in which the value of Md represented by formula (1) is 50.0-150.0 DEG C and the austenite phase is 25-49 vol%. In addition, the value of Md, which is represented by formula (1), of the austenite phase is 35.0-100.0 DEG C. Md = 551-462 (C + N)-9.2 Si-8.1 Mn-29 (Ni + Cu)-13.7 Cr-18.5 Mo (1) In the formula, the element symbols represent the content (mass%) of each element.

The present invention relates to a heat-treatment-free, high-strength and high-toughness die-casting aluminum alloy, a product prepared therefrom, and a preparation method therefor. The die-casting aluminum alloy includes, in addition to Al and unavoidable impurity elements, the following chemical components by mass percentage: 6.5-9.5% of Si, 0.1-0.3% of Fe, 0.4-0.85% of Mn, 0.1-0.6% of Mg, 0.1-0.9% of Cu, 0.02-0.12% of Ti, and 0.05-0.15% of Sb; at the same time, said components satisfy the following equations: Fe + Mn ≥ 0.65%, Mn / Fe = 2.0-6.6, each element symbol in the equations representing the mass percentage content of the corresponding element. The present invention solves the problem with this type of heat treatment-free die-casting alloy that Sb deteriorates and causes a melt to absorb gas, leading to elongation not being stable, thus enabling an aluminum alloy die-cast piece to obtain a structure having no significant holes or porosity defects at any location within, thereby ensuring an elongation of 10% or greater at every position of the part while tensile strength is 230 MPa or greater and yield strength 150 MPa or greater.

The invention discloses die steel powder with high corrosion resistance. The die steel powder comprises the following chemical components in percentage by mass: 17.0%-18.5% of Ni, 8.0%-9.5% of Co, 4.5%-5.0% of Mo, 1.8%-2.5% of Cr, 0.4%-0.7% of Cu, 0.06%-0.12% of Y, 0.6%-0.9% of Ti, 0.06%-0.12% of Al and the balance of Fe. The invention further discloses a gas atomization preparation method of the high-corrosion-resistance die steel powder. The gas atomization preparation method comprises the following steps: (1) burdening and charging; (2) vacuumizing and gas replacement; (3) staged smelting: carrying out medium-frequency induction heating on the smelting crucible, raising the temperature to 1650-1720 DEG C at the speed of less than or equal to 10 DEG C / min, and keeping the temperature for 15 minutes after the matrix alloy is molten; adding high-purity elemental metals of Y, Ti and Al elements through a secondary feeding device 5-8 minutes before pouring is started, and realizing uniform diffusion of the elements by matching with argon covering and stirring; (4) argon atomization; and (5) powder post-treatment. According to the powder, the corrosion resistance is greatly improved by reasonably designing the components and the percentage thereof. According to the powder obtained through the gas atomization preparation method, the corrosion resistance is larger than or equal to 700 hours, the oxygen content is smaller than or equal to 50 ppm, the density is larger than 99.8%, and therefore the requirements of high-end optical molds are met.

The invention relates to a corrosion-resistant alloy welding wire, in particular to an ERNi CrMo-3 corrosion-resistant alloy welding wire and a preparation method thereof. The steel comprises the following chemical components in percentage by mass: greater than or equal to 64% of Ni, 21%-23% of Cr, 8.5%-10% of Mo, less than or equal to 0.2% of Fe, 0.1%-0.3% of Ti, 0.1%-0.25% of Al, 3.5%-4.15% of Nb, less than or equal to 0.2% of Cu, less than or equal to 0.02% of C, less than or equal to 0.5% of Mn, less than or equal to 0.35% of S i, less than or equal to 0.005% of S and less than or equal to 0.005% of P. By adopting vacuum induction melting and electroslag remelting, the content of all elements in the alloy can be accurately controlled, the content of impurity elements (H, O, N, S, P and the like) is effectively reduced, the content of oxygen and nitrogen is controlled to be not larger than 20 ppm, alloy components are more uniform and stable, and therefore the corrosion resistance and the high-temperature mechanical property of the welding wire are improved.

The invention belongs to the technical field of welding materials, and relates to a welding wire for aluminum-based or aluminum-silicon-based coating hot stamping steel and a preparation and use method of the welding wire. The welding wire for the aluminum-based or aluminum-silicon-based coating hot stamping steel is composed of the following chemical components of, by weight, 0.12%-0.28% of C, 0.6%-1.2% of Si, 1.9%-2.7% of Mn, 0.4%-2.0% of Cr, 0.5%-1.0% of Mo, 1.6%-3.5% of Ni, 0.05%-0.1% of Zr + Ti + Nb, 0%-0.02% of RE, smaller than or equal to 0.010% of P and the balance Fe and inevitable impurities. The welding wire can prevent a welding seam from forming high-temperature delta ferrite, and meanwhile complete austenitizing of the welding seam during hot stamping is achieved by precisely regulating and controlling the content of the elements. The invention further provides a preparation method and a use method of the welding wire for the aluminum-based or aluminum-silicon-based coating hot stamping steel.

The invention relates to an AB2 type hydrogen storage alloy and a preparation method and application thereof, the AB2 type hydrogen storage alloy comprises a matrix metal and a second metal, and the composition general formula of the matrix metal is Ti Zr Cr < c > Mn < d >; wherein 0.76 < = a < = 0.9, 0.16 < = b < = 0.24, 0.76 < = c < = 0.84, 1.05 < = d < = 1.2, and a + b + c + d = 3; and the second metal is metal except Ti, Zr, Cr and Mn. The composition of the matrix metal in the AB2 type hydrogen storage alloy is limited, the number of atoms of all elements is limited, meanwhile, the second metal is added, the prepared AB2 type hydrogen storage alloy is high in effective hydrogen storage capacity and small in hydrogen absorption and desorption platform hysteresis, and the high hydrogen storage capacity can still be kept after 3000 times of hydrogen absorption and desorption circulation.

The invention provides a remanufacturing repair method for generating a high-entropy effect in situ under the synergistic effect of multiple laser beams. When the surface of the damaged TiAl alloy blade is repaired, firstly, a first laser beam A is used for preheating a TiAl alloy in the repairing advancing direction, so that the TiAl alloy is molten to form a molten pool D rich in Ti and Al elements; secondly, a second beam of laser B is used for heating and melting Mo, Nb and Ta mixed powder sent out by the laser cladding head, and a molten pool E rich in Mo, Nb and Ta elements is formed; and along with advancing of the laser B in the repairing direction, the molten pool D and the molten pool E are combined to form a molten pool F rich in Mo, Nb, Ta, Ti and Al elements. And then a third beam of laser C is used for making a spiral line according to a preset route to swing and heat the molten pool F, and the stirring effect is achieved, so that the five elements of Mo, Nb, Ta, Ti and Al are evenly distributed in the molten pool, and the high-entropy effect after element mixing is enhanced. And finally, after the molten pool F is cooled, the MoNbTaTiAl high-entropy alloy coating is formed on the surface of the TiAl alloy. According to the method, the high-entropy effect is generated in situ through the additional elements and the matrix elements, and high-quality repairing of the surface of the TiAl alloy blade can be achieved.

The invention relates to the technical field of metal materials, in particular to a negative enthalpy duplex stainless steel material with high strength, high plasticity and high corrosion resistance and a preparation method. The negative enthalpy duplex stainless steel material is Fe Cr N < c > Mo < d > Mn < e > C < f > Si < g > Ti < h > Al V < j >; wherein a, b, c, d, e, f, g, h, i and j respectively correspond to the mass percentage of each element, a is equal to 60-70 wt%, b is equal to 15-20 wt%, c is equal to 10-15 wt%, d is equal to 0-5 wt%, e is equal to 1-5 wt%, f is equal to 0.015 wt%, g is equal to 0-1 wt%, h is equal to 0-3 wt%, i is equal to 0-0.5 wt%, and d, g, h, i and j are all not equal to 0. The series of negative enthalpy duplex stainless steel materials structurally contain ferrite and austenite, and the microscopic structure and the mechanical property of the alloy can be regulated and controlled by adjusting the proportion of different metal elements. The series of negative enthalpy duplex stainless steel materials show high-strength and high-plasticity mechanical properties. Meanwhile, the negative enthalpy duplex stainless steel material shows excellent corrosion resistance.

The invention discloses a high-heat-resistance and high-conductivity copper alloy and a preparation method and application thereof. The copper alloy comprises 0.001 wt%-0.01 wt% of Ag; the content of P is 0.0005 wt%-0.002 wt%; the copper alloy comprises the following components in percentage by weight: 0.003 to 0.008 percent of X and the balance of Cu and impurities. The preparation process of the high-heat-resistance and high-conductivity copper alloy comprises the steps of smelting, casting, continuous extrusion, solid solution treatment, drawing, low-temperature annealing, sizing and packaging. The preparation method comprises the following steps: proportioning and smelting according to the mass percent of each element of the copper alloy; and in the low-temperature annealing process, the annealing temperature is 150-350 DEG C, and the heat preservation time is 2-10 h.

The invention discloses a high-strength and high-toughness nickel-based multi-principal-element alloy and a preparation method thereof, and belongs to the technical field of novel metal materials and preparation thereof.The preparation method comprises the following steps that raw materials are cleaned and matched according to the mass percent of composition elements of the high-strength and high-toughness nickel-based multi-principal-element alloy; smelting the proportioned raw materials in a vacuum arc furnace, and carrying out suction casting to obtain a multi-principal-element alloy block; and the multi-principal element alloy block is subjected to homogenizing annealing treatment, rolling deformation and subsequent heat treatment, and then the high-toughness nickel-based multi-principal element alloy is obtained. The preparation method is simple, the heat treatment method is simple and convenient, good matching of strength and toughness is achieved, the mechanical property of the multi-principal-element alloy subjected to aging treatment for 12 hours is optimal, the yield strength is 925.5 MPa, the ultimate tensile strength is 1268.6 MPa, and the ductility is 24.1%.

The invention discloses a neodymium-iron-boron magnet and a preparation method thereof. Raw materials of the neodymium-iron-boron magnet comprise a neodymium-iron-boron magnet base body and slurry containing a heavy rare earth element RE '. The component composition of the neodymium iron boron magnet base body is REx (Fe < 100-a > Ma) < 100-x-y > By, wherein RE is at least two of La, Ce, Pr and Nd and certainly contains Pr, and the mass of Pr in RE accounts for 25%-35% of the total mass of RE; m is selected from at least one of Co, Cu, Al, Nb, Ti, Zr and Ga; a, x and y represent numerical values obtained by multiplying the weight percentage of each element by 100, 28.5 < = x < = 31, 0.85 < = y < = 1.02, and 1.9 < = a < = 4.4; rE'is at least one of Pr, Gd, Tb, Dy, Ho and Er. After raw materials are made into neodymium iron boron alloy powder, a neodymium iron boron magnet base body is obtained through magnetic field forming, sintering and aging treatment, then the surface of the magnet base body is coated with slurry, elements in the slurry permeate into the interior from the surface of a flaky magnet through grain boundary diffusion, and the neodymium iron boron magnet is obtained. The use of heavy rare earth elements can be reduced, and meanwhile, the magnetic performance of the magnet is improved.

The invention discloses a high-entropy alloy particle reinforced copper-based contact material and a preparation method and application thereof, and belongs to the technical field of contact materials. The reinforced-phase high-entropy particles are added into the copper matrix to improve the ablation resistance of the contact material. Powder of five different elements is mixed, subjected to ball milling and annealed to obtain high-entropy alloy powder, then copper powder and the high-entropy powder are mixed and subjected to ball milling to obtain Cu-HEAs composite powder, and finally the high-entropy alloy reinforced copper-based contact material is obtained through the SPS hot pressing sintering technology. The Cu-HEAs contact material has excellent physical and mechanical properties, the arc erosion resistance of the copper-based contact material is enhanced, and the service life of a contact is prolonged.

The invention discloses a nickel-based single-crystal high-temperature alloy with high structure stability and a preparation method thereof, and relates to the technical field of high-temperature alloys. The nickel-based single crystal high-temperature alloy provided by the invention is prepared from the following components in percentage by mass: 5 to 7 percent of Al, 7.5 to 10 percent of Co, 5 to 7 percent of Cr, 0.1 to 0.2 percent of Hf, 0 to 2 percent of Mo, 5.5 to 7.5 percent of Ta, 0 to 1 percent of Ti, 8 to 10 percent of W, 0.02 to 0.05 percent of C, 0.003 to 0.005 percent of B and the balance of Ni. According to the invention, by controlling the ratio of elements and avoiding the addition of Re, the precipitation temperature of a harmful TCP phase is obviously reduced to about 840 DEG C on the basis of maintaining a sufficient solid solution strengthening effect, and the long-term stability of the structure is greatly improved. The high-temperature mechanical property of the alloy provided by the invention reaches the level equivalent to that of a traditional Re-containing second-generation single-crystal alloy and is remarkably superior to that of foreign Re-free single-crystal alloys MD2 and Rene N500, and the nickel-based single-crystal high-temperature alloy with high structure stability successfully realizes the unification of low cost and high performance, and is suitable for industrial production. And a reliable material solution is provided for manufacturing the heavy-duty gas turbine blade with higher market competitiveness.

The invention relates to the technical field of alloys, in particular to a Ni3Al-based alloy, a test bar, a turbine disc and a preparation method of the Ni3Al-based alloy. The invention discloses a Ni3Al-based alloy which comprises the following components in percentage by mass: 7%-9% of Al, 7%-8.5% of Cr, 0.13%-0.24% of C, 0.5%-2% of Ti, 3%-6% of Mo, 1%-3% of W, 1%-2% of Hf, 0.005%-0.03% of B and the balance of Ni. According to the Ni3Al-based alloy disclosed by the invention, all the elements are coordinated and matched, so that the Ni3Al-based alloy has a long-range ordered crystal structure, a stable high-temperature phase structure and excellent oxidation resistance, mechanical property and high-temperature property.

The invention discloses a preparation method of a high-strength, high-hardness and ablation-resistant CuWTaTeAl gradient nano composite material. The method comprises the following steps: 1, mechanically mixing Cu80Al20 spherical coated powder, Cu90W10 spherical coated powder, WTe2 alloy powder, Ta powder and Cu powder, and then carrying out ball milling and mixing; 2, performing SPS (spark plasma sintering); thirdly, after soaking treatment, multi-pass hot rolling deformation is carried out, and then quenching treatment is carried out; and 4, annealing heat treatment. The binary spherical coating powder, the alloy powder and the elementary substance powder are subjected to ball milling and mixing to achieve uniform distribution of all elements, high-melting-point W and Ta are added to improve the ablation-resistant temperature of the composite material, large-scale copper dendrite powder is added to form gradient distribution nanocrystals, the proportion of all the elements is controlled, the lattice distortion degree is increased, and the ablation-resistant temperature of the composite material is improved. The high-strength, high-hardness and ablation-resistant CuWTaTeAl gradient nano composite material is suitable for the fields of contacts, switches, electrical connectors, resistance welding electrodes and the like.

The invention discloses a low-temperature high-toughness austenitic stainless steel welding wire and a preparation method thereof, and relates to the technical field of welding materials, in particular to a welding wire with high-toughness mechanical properties of formed cladding metal in a low-temperature environment and a preparation method of the welding wire. The Ti element is introduced into the welding wire, the dosage relation of the Al element and the Ti element is controlled, and the mass ratio of Al to Ti is kept to be (5-10): 1; a proper amount of Al element can play a role in purifying a molten pool during welding work, a proper amount of Ti element can effectively stabilize an austenite phase, and therefore it is guaranteed that the welding wire has the basic welding capacity, and meanwhile after the welding wire is converted into cladding metal, the welding wire is not prone to deformation. The material characteristics and the like of the material can meet the use requirements at room temperature and ultralow temperature environment, that is, the material has and keeps good tensile property, impact property and the like, so that pipelines, containers and the like prepared from the material can be used for transmitting or loading special low-temperature materials such as liquid hydrogen, liquid helium and the like.

The invention relates to the technical field of metal smelting, and particularly discloses a preparation method of a high-purity IN718 alloy material. According to the method, on the premise that the mechanical property result redundancy of the IN718 alloy material is large, the content of inclusions and formation of carbides in the steelmaking process are reduced by optimizing the content of C, N and Nb elements in the vacuum induction melting process, reducing the refining temperature and reducing the melting speed of vacuum self-consuming remelting; and in cooperation with two-heating-number upsetting and drawing deformation in the forging process, the situation that carbides in the IN718 alloy material are dispersed unevenly due to segregation is avoided. According to the high-purity IN718 alloy material and the preparation method thereof, the content of carbides in steel ingots is remarkably reduced by controlling all parameters in the duplex process, the overall level of the carbides in the high-purity IN718 alloy material is smaller than or equal to 2.0 level after homogenizing diffusion annealing, forging, machining and heat treatment, the purity of the existing IN718 alloy material is improved, and the use requirements of special equipment such as deep sea equipment and nuclear power equipment can be met.

The invention relates to the technical field of welding rods for automatic welding of 2205 duplex stainless steel, in particular to a welding rod for automatic welding of 2205 duplex stainless steel and a preparation method of the welding rod. When the residual stress at the welding seam of the 2205 duplex stainless steel is eliminated through heat treatment, the tensile strength and the corrosion resistance of the welding seam can be remarkably reduced. In order to solve the technical problems, the welding rod for 2205 duplex stainless steel automatic welding comprises a flux core and a coating, the coating is formed by evenly mixing a binding agent and welding flux powder, and titanium-iron alloy powder, zirconium-iron alloy powder and niobium-iron alloy powder are added into components of the welding flux powder at the same time; according to the method, the contents of Ti, Zr and Nb elements in the electrode coating are increased, so that the purposes of refining grains of a weld joint and stabilizing ferrite are achieved, transformation of ferrite to austenite in the high-temperature heat treatment process of the weld joint is reduced, a proper amount of iron powder is added into the electrode, and the efficiency of automatic welding is greatly improved.