159 results about "Al element" patented technology

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.

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 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 belongs to the technical field of aluminum alloy materials and preparation thereof, and relates to a high-strength and high-toughness die-casting aluminum alloy and a preparation technology and application thereof.The aluminum alloy comprises Si, Mg, Cu, Mn, Zn, Fe, Cr, Ti, Zr, Sr, Sb, B, La, Ce, Be, P, smaller than or equal to 0.05% of other single elements, smaller than or equal to 0.15% of other impurity elements in total and the balance Al element, the content of Sr and the content of Sb cannot be larger than or equal to 0.005% at the same time, and the balance Al element. According to a singly-cast sample prepared from the high-toughness die-casting aluminum alloy, the tensile strength at the room temperature is 380-450 MPa, the yield strength is 250-350 MPa, the ductility is 3-8%, the brinell hardness is larger than or equal to 105 HB, the electric conductivity is larger than or equal to 19 MS / m, and the heat conductivity is larger than or equal to 140 W / m.K; and at the temperature of 200 DEG C, the tensile strength ranges from 280 MPa to 350 MPa, the yield strength ranges from 220 MPa to 290 MPa, and the ductility ranges from 5% to 10%.

The invention mainly provides a nuclear fuel cladding composite material and a preparation method thereof. The nuclear fuel cladding composite material comprises a zirconium alloy matrix, the niobium-rich diffusion barrier layer is formed on the surface of the zirconium alloy matrix; the Cr coating covers the niobium-rich diffusion barrier layer; and an Al-rich layer formed on the surface of the Cr coating. The preparation method comprises the following steps: firstly, carrying out surface pretreatment on the zirconium alloy matrix; a niobium-rich diffusion barrier layer is formed on the surface of the zirconium alloy matrix through ion implantation; then depositing a Cr coating on the niobium-rich layer; and finally, an Al element is injected into the surface of the Cr coating, and an Al-rich layer is formed so that an Al2O3 protective layer can be formed under the high-temperature working condition. According to the technical scheme, interface mutual diffusion can be effectively inhibited, the stability of the coating is improved, meanwhile, the Cr coating structure is optimized, the oxidation process is delayed, a gradient protection system is constructed, and the oxidation resistance of a high-temperature material is enhanced.

The invention relates to a TiAl alloy additive manufacturing method. The TiAl alloy additive manufacturing method comprises the steps that TiAl alloy powder is selected; establishing a three-dimensional model; a scanning path is planned; when the section width of the part is smaller than the preset partition width, a standard scanning line length is adopted for scanning; on the contrary, the section of the part is subjected to region division, and the partition scanning line length is adopted for scanning; the standard scanning line is longer than the partition scanning line; and the TiAl alloy powder is loaded into a powder bin of electron beam additive manufacturing equipment, and scanning melting is carried out. According to the method, the content of the Al element in the TiAl alloy powder is controlled, so that the alloy solidification process is carried out according to a beta solidification path, and formation of fine isometric crystals is facilitated; by controlling the content of the B element, borides which are distributed in a dispersed mode are formed, and the effect of refining the microscopic structure is achieved; by setting the preset partition width, the partition lap joint width and the partition offset width, the structure and performance difference caused by remelting at the partition scanning lap joint is solved.

The invention relates to the technical field of material protection, in particular to a lead-bismuth-resistant coating and a preparation method thereof.The coating is composed of a metal bonding layer, a functional transition layer and a corrosion-resistant layer, the metal bonding layer is formed by compounding a high-entropy alloy and a medium-entropy alloy, a component gradient transition structure is formed, the high-entropy alloy is a near-equal-atomic-ratio alloy of Fe, Co, Ni, Cr and Al, and the medium-entropy alloy is a near-equal-atomic-ratio alloy of Fe, Co, Ni, Cr and Al. %, and the medium-entropy alloy is a FeCoNiCr system quaternary alloy, and the content of the Al element is 5-10 at. The functional transition layer is a transition metal nitride layer; and the corrosion-resistant layer is an eutectic composite layer of rare earth oxide and stabilized oxide. Therefore, the problems of insufficient bonding strength, limited corrosion resistance, poor process stability and the like in the prior art are solved.

The invention discloses a preparation method of an ultralight high-performance flame-retardant magnesium-lithium alloy bar, which comprises the following steps: 1) smelting a magnesium-lithium alloy raw material, and casting and molding; (2) the magnesium-lithium alloy cast ingot is preheated and subjected to hot extrusion forming; and (3) the magnesium-lithium alloy extruded bar is subjected to deformation treatment of cold rotary swaging, and the ultra-light high-performance flame-retardant magnesium-lithium alloy bar is obtained. The Al element for improving the mechanical property of the alloy and the Ca element for improving the flame retardant property of the alloy are added into an Mg-Li alloy system, the comprehensive performance of the magnesium-lithium alloy is cooperatively regulated and controlled, meanwhile, the atomic number of the Al element and the atomic number of the Ca element are low, and when the Al element and the Ca element are added into the magnesium-lithium alloy, the characteristics of the ultra-light structure alloy of the magnesium-lithium alloy are kept; meanwhile, the subsequent extrusion-rotary swaging composite deformation process is combined to improve the mechanical property of the alloy, the alloy has excellent mechanical property at room high temperature, and the room temperature tensile strength of the alloy series is 210-240 MPa; the elongation rate is 4.1 to 5.1 percent; the performance is stable at the medium-high temperature of 100 DEG C, and the tensile strength is 160-240 MPa; and the elongation rate is 17.2 to 22.1 percent.

The invention discloses a high-strength and high-conductivity copper alloy and a preparation method thereof. The high-strength and high-conductivity copper alloy is prepared by mixing Cu-Al pre-alloyed spherical powder and CuO powder according to the mass ratio of (100-400): 1. The mass fraction of Al in the Cu-Al pre-alloyed spherical powder is 0.1-0.5%, and the balance is copper; the Al element in the solid solution state in the high-strength and high-conductivity copper alloy is partially oxidized into Al2O3 through CuO and exists in a Cu matrix in the form of Al2O3. The preparation method comprises the following steps: (1) powder mixing: firstly mixing Cu-Al pre-alloyed spherical powder with CuO powder, and then carrying out vacuum drying; (2) isostatic pressing treatment is conducted, specifically, the mixture is injected into a mold, and hot isostatic pressing treatment is conducted after cold isostatic pressing forming is conducted; and (3) carrying out hot extrusion to obtain the high-strength and high-conductivity copper alloy. The high-strength and high-conductivity copper alloy is good in conductivity and mechanical property. The method is simple in process, environmentally friendly, low in cost and suitable for industrial production.

The invention discloses a positive electrode material with a coating layer, a preparation method of the positive electrode material and a lithium ion battery. The positive electrode material with the coating layer comprises a positive electrode inner core and the coating layer coated on the surface of the positive electrode inner core, wherein the chemical composition of the positive electrode inner core is Li [alpha] Ni [x] Co [y] Al [z] A [m] O [2]; the coating layer contains an element Co and an element X, and the mass ratio of the element X in the coating layer to the element Co in the coating layer is 50%-100%; x is a metal element different from Co, and 50 wt.% or more of X is an Al element; the positive electrode core comprises a coating layer, the coating layer comprises a lithium cobalt oxide, the lithium cobalt oxide comprises specific contents of Li Co < 1-a > Co < 2 > O < 4 >, Li Co < 1-b > O and Li < Co > O < 2 >, and by taking the total mass of the positive electrode core as a reference, the content of Co element in the coating layer is 1000-4000 ppm. According to the invention, the positive electrode material can give consideration to both low heat production and gas production.

The invention discloses a preparation method of a multistage strengthened coating on the surface of zirconium alloy, a multilayer film with CrTaNbSiO multi-component oxide layers and CrAlTaNbSi multi-component metal layers distributed alternately is prepared on a Zry-4 substrate through a magnetron sputtering method, and the thickness of each layer is 0.8-1.2 microns. The CrAlTaNbSi layer provides plasticity and toughness buffering through a high-entropy effect; the CrTaNbSiO layer takes amorphous SiO2 as a matrix, and a CrTaO4 / CrNbO4 nanocrystalline phase is embedded, so that the cooperation of oxygen diffusion blocking and nanometer strengthening is realized, and relatively high hardness and wear resistance are provided; the Al element in the multi-component metal layer diffuses into the oxide layer under the specific oxygen partial pressure to form a continuous Al2O3 layer, diffusion of the element is further hindered, the interface self-strengthening effect is achieved, and the coating is prevented from being peeled off.

The invention discloses a preparation method of a TC4 titanium alloy cast ingot. The preparation method comprises the following steps: determining a used residual waste component range according to target components of the TC4 titanium alloy cast ingot; the residual waste materials and the aluminum bars are evenly arranged in a feeding groove of the electron beam cold bed furnace; primary smelting is conducted through an electron beam cold bed furnace, and a primary cast ingot is prepared; and the primary cast ingot is smelted through a vacuum consumable electric arc furnace, and the TC4 titanium alloy cast ingot is prepared. Before material distribution, the loss amount in Al element smelting is calculated, and supplementation is carried out during material distribution, so that excessive loss of the Al element in EB smelting is made up, and the ingot casting quality is improved; the aluminum bars are uniformly distributed in the feeding groove, so that the burning loss of the aluminum element is balanced, the aluminum element in the cast ingot is uniformly distributed, and the phenomenon of macrosegregation is improved.

The invention relates to the technical field of metal material additive manufacturing, in particular to an additive manufacturing TiAl alloy structure homogenization method. According to the method, 1.5 at.%-2.5 at.% of an Al element is added into a TiAl alloy for compensation, then TiAl alloy powder is prepared, electron beam selective melting printing is carried out, short-time circulating heat treatment is carried out after hot isostatic pressing treatment is carried out, the temperature in the short-time circulating heat treatment process is 5-20 DEG C higher than T alpha / (alpha + gamma), and heat preservation is carried out for 3-10 min; according to the method, the problem of non-uniform structure of the TiAl alloy formed by SEBM is synergistically solved by compensating the content of Al element and a short-time circulating heat treatment process, a uniform and fine lamellar structure can be obtained without a complicated process parameter optimization process, the size of a lamellar cluster is smaller than 100 microns and is far lower than that of a lamellar cluster prepared by conventional heat treatment, and the method is suitable for large-scale production. The room-temperature tensile strength of the alloy is at least improved by 150MPa, and the tensile strength at 750 DEG C is at least improved by 80MPa. The process method is simple and high in adaptability, and can be widely applied to additive manufacturing of the TiAl alloy.

The application discloses a gallium oxide vertical device and a preparation method thereof. The gallium oxide vertical device comprises an epitaxial structure, a cathode and an anode matched with the epitaxial structure, the epitaxial structure comprises a heavily doped n-type Ga2O3 substrate, a lightly doped n-type Ga2O3 drift region, an interlayer and a p-type nitride epitaxial layer which are sequentially stacked, the lightly doped n-type Ga2O3 drift region, the interlayer and the p-type nitride epitaxial layer form a p-i-n structure, the cathode forms an ohmic contact with the heavily doped n-type Ga2O3 substrate, and the anode forms an ohmic contact with the p-type nitride epitaxial layer, wherein the material of the interlayer is an Al-containing compound, and the surface layer region of the lightly doped n-type Ga2O3 drift region close to the interlayer also has Al elements, the Al elements are diffused into the lightly doped n-type Ga2O3 drift region in the bonding process under high pressure.

The application discloses a preparation method of a high-strength cast magnesium alloy, the alloy containing two non-rare-earth strengthening alloy elements of Sr and Ti, wherein the Ti element is preferentially combined with Al to form AlTi or Al3Ti intermetallic compounds and is gathered along the grain boundary, hindering the growth of alpha-Mg grains, the remaining Al element is combined with Mg to form a beta phase, the grain size is reduced, the morphology of the beta phase is improved, and thus the mechanical properties are improved; the Sr element can strengthen the beta phase on one hand, and can consume the Al element at the solidification front by forming a new Al4Sr phase, so that the volume fraction of the beta phase is reduced; in addition, the Sr element can form an adsorption film of strontium on the grain growth interface as a surface active element, so that the grain growth speed is reduced, the alloy has more time to generate more crystal nuclei when solidifying, and the grains are refined; under the synergistic effect of the two elements, the strength of the magnesium alloy is significantly improved.

The present invention belongs to the technical field of cemented carbide manufacturing, and discloses a cemented carbide with a cobalt-aluminum intermetallic compound CoAl as a bonding phase and a preparation method thereof. The cemented carbide is composed of a cobalt-aluminum intermetallic compound CoAl as a bonding phase and a hard phase WC. When the molar ratio of the added Co element and the Al element is 1:1 or 3:2, respectively, a cemented carbide with the intermetallic compound CoAl as a bonding phase is obtained. The mixed powder is evenly mixed by ball milling, and then spark plasma sintering is performed to finally obtain a dense cemented carbide with the cobalt-aluminum intermetallic compound CoAl as a bonding phase. The material composition of the present invention is reasonably designed, the preparation process is simple and controllable, the production cost is low, and large-scale industrial production and application are possible.

The application belongs to the technical field of copper wire preparation, and discloses a preparation process of high-strength and high-toughness copper wire. The preparation process comprises the following steps: mixing Ni, Co and Al element powders according to a molar ratio of 0.95-1.05:0.95-1.05:0.95-1.05, and then high-energy ball milling to obtain Ni-Co-Al middle-entropy alloy micro powder, and then vacuum arc melting or discharge plasma sintering to obtain Ni-Co-Al middle-entropy alloy; mixing the Ni-Co-Al middle-entropy alloy with tungsten copper alloy and copper ingot for melting, cooling the molten copper water through a condensing device, drawing out by a traction mechanism, annealing treatment, winding by a rewinding machine after cooling, and obtaining the copper wire. The application takes the copper ingot as a base material, the tungsten copper alloy as a reinforcing phase, and the Ni-Co-Al middle-entropy alloy as a bonding phase, and the copper wire is prepared by conventional mixed melting, so that the application has the advantages of simple processing method and low production cost.

The invention belongs to the technical field of alloy content detection, and particularly relates to a method for accurately detecting the Al content of high-manganese and high-aluminum steel by using a direct-reading spectrum instrument. According to the method, the high-purity and high-homogeneity high-manganese and high-aluminum steel standard sample is prepared through vacuum carbon deoxidation smelting, high-temperature homogenization treatment and high-temperature solution treatment; the method comprises the following steps: preparing a high-manganese high-aluminum steel standard sample solution and a series of Al concentration standard solutions, and accurately measuring the Al content of the high-manganese high-aluminum steel standard sample by using an ICP-AES instrument; exciting the high-manganese and high-aluminum steel standard sample by using a direct-reading spectrum instrument to obtain the spectral line intensity of the Al element when the Al contents are different; and finally, according to the measured Al content and the spectral line intensity of Al, establishing a working curve of the Al content in the direct-reading spectrometer. According to the method, the problem that the Al content of the high-manganese and high-aluminum steel cannot be accurately measured by a direct-reading spectrum instrument is solved, the repeatability and the stability of a measurement result are good, the requirement for rapid analysis in the production smelting process is met, and a guarantee is provided for industrial production of the high-manganese and high-aluminum steel.

The invention provides a heat treatment-free ZL101A aluminum alloy and a preparation method thereof. The heat-treatment-free ZL101A aluminum alloy is prepared from the following components in percentage by mass: 6.5 to 7.5 percent of Si element, 0.2 to 0.4 percent of Mg element, 0.05 to 0.9 percent of Sc element, 0.05 to 0.9 percent of Er element, 0.1 to 0.2 percent of Ti element, less than or equal to 0.1 percent of Mn element, less than or equal to 0.2 percent of Fe element, less than or equal to 0.2 percent of Cu element and the balance of Al element, wherein reinforcing particles are further added into the heat treatment-free ZL101A aluminum alloy, and the mass ratio of the reinforcing particles in the heat treatment-free ZL101A aluminum alloy is 0.1%-3%. According to the heat-treatment-free ZL101A aluminum alloy, the mechanical property of the heat-treatment-free ZL101A aluminum alloy is improved, and the strength and toughness of the heat-treatment-free ZL101A aluminum alloy in a cast state are improved.

The present application relates to the technical field of electrochemical hydrogen evolution reaction, in particular to a HER electrochemical cathode material based on Ni-Mo-Al composite coating. The conventional coating preparation technology has high cost, low powder utilization rate and poor bonding force between the coating and the current collector substrate. In view of the above problems, the present application provides a HER electrochemical cathode material based on Ni-Mo-Al composite coating, which is a metal composite coating formed by loading Ni, Mo and Al three kinds of metal powder on the surface of porous nickel current collector, the metal composite coating and the surface of porous nickel current collector form metallurgical bonding, and the metal composite coating is a coating obtained by coating Mo powder in the Ni-Al binary eutectic phase formed by Ni element and Al element. In the electrode material of the present application, no noble metal is used, the cost is low, the bonding force between the coating and the current collector substrate forms metallurgical bonding, the bonding force is strong, no toxic Cl2 gas is produced, and it is more environmentally friendly.

The application discloses a high-temperature high-strength high-entropy MAX phase bulk material and a preparation method thereof. The high-temperature high-strength high-entropy MAX phase bulk material is expressed as M2AX, M is a combination of any four or more of Ti, Zr, V, Nb and Ta, the atomic percentage of each component in the M sublattice is between 5% and 35%, the sum of the atomic percentages of Zr and V is less than or equal to 16.7%, A is an Al element, and X is a C element. The bulk MAX phase material is prepared by a spark plasma sintering method. The high-temperature high-strength high-entropy MAX material prepared by the application has high purity and excellent mechanical properties at room temperature and high temperature, can be used for preparing high-temperature structural parts under special working conditions, and has a wide application prospect in the high-temperature field.

The invention discloses a design method and application of a high-toughness Al-Cu series cast aluminum alloy, and relates to the technical field of cast aluminum alloys, the design method comprises the steps that alloy components are limited, and a variable temperature aging process is adopted, the alloy components comprise the Cu element, the Mg element and the Zn element; si element, Sn element and Al element; the variable-temperature aging process is executed after the alloy is subjected to conventional solution treatment, and comprises the following steps: carrying out high-temperature nucleation for the first time; first-time low-temperature growth; carrying out secondary high-temperature nucleation; and carrying out secondary low-temperature growth. Through the variable temperature aging process, nucleation and growth are decoupled, a high-density fine precipitated phase is obtained, the contradiction that strength and toughness of a traditional process are difficult to obtain at the same time is solved, and high-toughness matching is achieved.

The application discloses a single-phase gamma' phase bonding layer alloy for high-temperature alloy and application thereof, and belongs to the technical field of material surface modification and coating. The single-phase gamma' phase bonding layer alloy for high-temperature alloy has the following chemical components and mass percentages: 8.9-9.4% of Al, 7.5-8.0% of Co, 4.9-5.4% of W, 4.4-4.9% of Ta, 2.8-3.1% of Cr, 1.4-1.6% of Ti, <=0.2% of Mo, <=0.2% of Hf, and the balance of Ni. The application is aimed at a nickel-based high-temperature alloy, and a coating component is designed in combination with the concept of matching compatibility of phase composition and a matrix. Under the premise of improving the Al element content in the alloy, the composition of the bonding layer is finally determined by determining the element composition of the gamma', wherein the gamma' phase is based on the Ni3(Al, Ti) phase and is similar to the composition of the gamma' / gamma phase of the nickel-based high-temperature alloy, so as to ensure the interface compatibility of the bonding layer and the matrix.

A sintered body of an oxide contains an In element, a Ga element, and an Al element, in which an atomic composition ratio of the In element and an atomic composition ratio of the Al element respectively satisfy a formula (1) and a formula (2) below,[In] / ([In]+[Ga]+[Al])>0.70(1)[Al] / ([In]+[Ga]+[Al])>0.01.(2)

The invention provides a 7xxx series aluminum alloy plate strip for anodic oxidation with a high recovery ratio and a preparation method of the 7xxx series aluminum alloy plate strip. The 7xxx series aluminum alloy plate strip comprises the following elements of 0.06%-0.12% of Si element, 0.10%-0.25% of Fe element, 4.5%-5.5% of Zn element, 2.0%-3.0% of Mg element, 1.2%-2.0% of Cu element, 0.05%-0.15% of Mn element, 0.10%-0.15% of Er element, 0.10%-0.12% of Zr element, 0%-0.03% of Ti element and the balance aluminum element. The aluminum alloy plate strip is prepared through the steps of reclaimed material grading pretreatment, low-liquid-level semi-continuous casting, multi-stage homogenizing heat treatment, hot rolling, cold rolling, solid solution, pre-stretching, two-stage aging and the like. Through joint optimization of material components and the process, the finished plate strip has excellent mechanical performance, an oxidation film is uniform in color and luster, and salt mist resistance, friction resistance and the like are achieved.

The invention discloses a production method of an ultra-supercritical unit F91 forged three-way forge piece, which sequentially comprises the steps of heating before forging, forging, annealing, rough turning, normalizing and tempering, the forge piece is made of martensite heat-resistant alloy steel with the model of ASTMA182F91, and the forge piece comprises the following components in percentage by mass: 20-30% of martensite heat-resistant alloy steel with the model of ASTMA182F91; the martensite heat-resistant alloy steel is prepared from 0.08%-0.12% of C, 0.2%-0.5% of Si, 0.3%-0.6% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.005% of S, smaller than or equal to 0.4% of Ni, 8%-9.5% of Cr, 0.06%-0.08% of Nb, smaller than or equal to 0.3% of Cu, 0.85%-1.05% of Mo, smaller than or equal to 0.02% of Al, smaller than or equal to 0.01% of Ti, 0.055%-0.068% of N, 0.18%-0.22% of V, smaller than or equal to 0.01% of Zr and the balance Fe and inevitable impurities. And the mass of the raw material piece heated before forging is 15-30 t. By setting the content of the N element to be higher and limiting the mass ratio of the N element to the Al element, the mechanical property of the forged piece at the high temperature is improved. The forging is air-cooled to a proper temperature and then is tempered, so that the production time is shortened under the condition that the high-temperature performance of the forging is basically unchanged.

The invention discloses a high-strength, high-plasticity and high-thermal-conductivity magnesium alloy and a preparation method thereof.The high-strength, high-plasticity and high-thermal-conductivity magnesium alloy is prepared from, by mass, 3%-6% of Al element, 0-0.2% of Mn element, 0.5%-3% of RE element and the balance Mg element; the RE element is any one of a Y element, a Gd element, an Er element and an Sm element; the grain of the high-strength high-plasticity high-thermal-conductivity magnesium alloy internally comprises an MgAl phase, the volume percentage of the MgAl phase is smaller than or equal to 20%, and the size is smaller than or equal to 300 nm. The high-strength high-plasticity high-thermal-conductivity magnesium alloy disclosed by the invention has the room-temperature yield strength of more than or equal to 200MPa, the tensile strength of more than or equal to 280MPa, the ductility of more than or equal to 20% and the thermal conductivity of more than or equal to 110W / (m.K), and can be applied to transportation tools such as new energy automobiles.

The present application relates to a kind of gradient nanostructured stainless steel bar and preparation method, belong to metal processing field.The stainless steel bar is gradient nanostructure, core is coarse grain, edge is nanocrystalline, and the main reason for the generation of edge nanocrystalline is that a large number of dispersed precipitates quickly refine grain in the plastic deformation process.The preparation process of the stainless steel bar introduces the precipitation alloying element Ti, Sc in matrix, introduces Al element in a certain range of bar edge, through composition alloying, cyclic cold drawing, cyclic aluminizing, aging local precipitation and the plastic deformation method of free end twist, finally obtains surface aluminum-rich layer, middle aluminum-poor precipitation hardening layer and core original layer, and the chemical composition, organizational features, grain size, precipitate phase quantity present gradient change in thickness direction.While improving the tensile strength of material, the plasticity of material can be kept basically unchanged, greatly widen the application scene of stainless steel bar.

The invention belongs to the technical field of advanced ceramics and energy storage, and particularly discloses Li-Zr double-site co-doped garnet solid electrolyte ceramic as well as a preparation method and application thereof, and the chemical formula of the Li-Zr double-site co-doped garnet solid electrolyte ceramic is Li6 (Al < 0.1 > Ga < 0.1 >) La3Zr1.6 (Nb < 0.2 > Ta < 0.2 >) O12; the Li element is from a lithium source, the Al element is from an aluminum source, the Ga element is from a gallium source, the La element is from a lanthanum source, the Zr element is from a zirconium source, the Nb element is from a niobium source, and the Ta element is from a tantalum source. According to the Li-Zr double-site co-doped garnet solid-state electrolyte ceramic as well as the preparation method and the application thereof, the Li-Zr double-site co-doped garnet solid-state electrolyte ceramic has relatively high ionic conductivity, and the cycling stability and the rate capability of a solid-state battery can be improved.

The invention discloses an embrittlement-resistant FeCrAl alloy and a manufacturing method thereof, and belongs to the field of metal materials. The invention relates to an embrittlement-resistant FeCrAl alloy, which comprises the following components in percentage by weight: 10.0 to 18.0 percent of Cr, 3.5 to 7.0 percent of Al, 0.2 to 0.8 percent of Si, 0.6 to 1.4 percent of Y, 0.4 to 1.3 percent of O, not more than 0.05 percent of C and the balance of Fe and inevitable impurities. The alloy can effectively reduce solid solution of the Al element in an alloy matrix, so that alloy embrittlement caused by segregation of Al under the high-temperature irradiation condition is reduced, the service life of a structural part adopting the alloy under the high-temperature irradiation condition is prolonged, and the reliability of the structural part adopting the alloy under the high-temperature irradiation condition is improved.