87 results about "Al element" patented technology

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 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 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 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.

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 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 discloses a novel high-hardness Mg-Al-Ti alloy as well as a preparation method and application thereof. The novel high-hardness Mg-Al-Ti alloy comprises an Mg element, an Al element and a Ti element, and the mass fraction of the Mg element is 30%-50% by weight, the mass fraction of the Al element is 30%-50% by weight, and the mass fraction of the Ti element is 8%-20% by weight. The preparation method comprises the following steps: uniformly grinding raw materials containing an Mg element, an Al element and a Ti element, and pressing into a blank body; the preparation method comprises the following steps: preparing a blank body, heating the blank body to a temperature required by sintering in an inert atmosphere at a heating rate of 4-5 DEG C / min, a temperature required by sintering of 410-435 DEG C and a sintering time of 1-1.5 h, and carrying out in-situ sintering on the blank body to prepare the novel high-hardness Mg-Al-Ti alloy, with the heating rate of 4-5 DEG C / min, the sintering temperature of 410-435 DEG C and the sintering time of 1-1.5 h. The high-hardness novel Mg-Al-Ti alloy provided by the invention is high in density, uniform in component and excellent in mechanical property, and can be widely applied to the fields of aerospace, automobile traffic and electronic products.

The application discloses a kind of corrosion-resistant magnesium alloy based on high Zn, Al content and preparation method thereof, the magnesium alloy includes the following mass percentage components: Zn 5%~8%, Al 5%~15%, Y 0.1%~3%, Mn 0.1%~2%, the balance is Mg and inevitable impurities.The application utilizes the synergistic effect of Al and Zn, Y element, forms dispersed distribution Al2Y, Mg-Al-Y-Zn and Mg-Al-Y phase in as-cast structure, effectively refines grain and blocks corrosion propagation channel, meanwhile, the solid solution effect of Al element promotes the formation of continuous and dense composite protective film on the substrate surface.The alloy does not need complex surface treatment or heat treatment, and the hydrogen evolution corrosion rate in 3.5% NaCl solution can be as low as 0.3 mm / a.The application not only significantly improves the intrinsic corrosion resistance of high Zn, Al content corrosion-resistant magnesium alloy, but also has low cost and simple process, providing a new idea for the large-scale application of corrosion-resistant as-cast magnesium alloy.

The application discloses a high-strength and high-plasticity Mg-Y-Zn-Si-Li-Al alloy and a preparation method thereof, and relates to the technical field of light alloy processing. 97.5 Y1Zn 0.5 In the Mg 97.5 Y1Zn 0.5 Si1base alloy, the Si element is combined with the Y element to form a YSi hard and brittle phase, which is easy to hinder the elongation of the alloy; the addition of the Li element plays a grain refining role on the one hand, effectively improves the strength of the alloy, and optimizes the second phase form on the other hand, promotes the transformation of the second phase to the nanometer level, provides more slip paths for dislocation movement, and avoids plasticity deterioration; the Al element is further combined with the Y element to form a high-strength Al2Y strengthening phase, which not only reduces the precipitation of the hard and brittle phase, but also stabilizes the organizational structure through the pinning effect at the grain boundary.

The invention provides a copper alloy pipe and a preparation method thereof. The copper alloy pipe is prepared from the following elements in percentage by mass: 0.5 to 2.1 percent of Al element, 0.5 to 2.0 percent of Si element, 0.5 to 2.0 percent of Ni element, 0.05 to 0.08 percent of Ce element, 0.05 to 0.1 percent of Cr element, 0.05 to 0.08 percent of V element, less than or equal to 0.02 percent of inevitable impurities and the balance of Cu element, an alpha phase and a beta phase exist in the copper alloy pipe, and the mass ratio of the alpha phase to the beta phase is (40-80): (20-60). The copper alloy pipe can give consideration to high strength, high conductivity and corrosion resistance, directional regulation and control of the double-phase proportion can be achieved by controlling the mass ratio of the alpha phase to the beta phase, optimization and adjustment are conducted according to the strength and conductivity requirements, and then the copper alloy pipe can be better applied to sea optical cable connecting pieces, underwater equipment connectors and other use scenes.

The invention relates to a light-weight high-strength and high-toughness magnesium-lithium alloy, a preparation method and application of the light-weight high-strength and high-toughness magnesium-lithium alloy in preparation of horseshoes, the light-weight high-strength and high-toughness magnesium-lithium alloy is prepared from the following raw materials in percentage by mass: 5-13% of Li, 0.5-3.5% of Al, 0-1.5% of Y and the balance of Mg and inevitable impurities, and the total amount of the impurities accounts for less than or equal to 0.1% of the alloy. On the basis of a traditional Mg-Li binary alloy, the Al element is introduced to form AlLi and Mg2Al3 phases, the Al element and the Al2Y phase induced by the Y element are cooperated, multi-phase synergistic strengthening is achieved, the synergistic breakthrough that the tensile strength is larger than or equal to 350 MPa and the elongation is larger than 20% is achieved while the density is ultralow, and compared with a traditional Mg-Li alloy, the strength of the alloy is improved by 50% or above, and the weight reduction effect is remarkable; through a spontaneous twin crystal mechanism in an alpha + beta double-phase region alloy, dislocation proliferation induced by groove rolling is combined, the damping performance (Q1 value) of the alloy is greatly improved, the damping potential of a horseshoe made of the alloy is far better than that of a traditional aluminum product, the joint impact load during horse movement can be remarkably reduced, and the protection effect is achieved.

The invention discloses a Mg-Y-Zn-Si-Li-Al alloy with a high product of strength and elongation and a preparation method of the Mg-Y-Zn-Si-Li-Al alloy, and relates to the technical field of light alloy processing. According to the Mg-Y-Zn-Si-Li-Al alloy with the high product of strength and elongation and the preparation method of the Mg-Y-Zn-Si-Li-Al alloy, in the Mg97.5 Y1Zn0. 5Si1 basic alloy, the Si element and the Y element are combined to form a YSi hard and brittle phase, and the phase serves as a stress concentration point and is prone to hindering improvement of the elongation of the alloy; the Li element is added, on one hand, the grain refinement effect is achieved, the alloy strength is effectively improved, on the other hand, the form of a second phase is optimized, the second phase is promoted to be converted to the nanoscale, more slippage paths are provided for dislocation motion, and plasticity deterioration is avoided; the Al element is further combined with the Y element to form a high-strength Al2Y strengthening phase, precipitation of hard and brittle phases is reduced, and the structure is stabilized through the pinning effect at the grain boundary.

The invention provides an aluminum alloy plate and a preparation method thereof. The preparation method comprises the steps that smelting, casting, soaking and heating integrated treatment, hot rolling and cold rolling are sequentially conducted after ingredients of an aluminum alloy plate are prepared, and a cold-rolled coiled material is obtained; the aluminum alloy plate comprises the following components in percentage by mass: 0.6-1.3% of Si element, less than or equal to 0.5% of Fe element, 0.5-1.1% of Cu element, less than or equal to 1.0% of Mn element, 0.6-1.2% of Mg element, less than or equal to 0.25% of Cr element, less than or equal to 0.7% of Zn element, less than or equal to 0.2% of Ti element, less than or equal to 0.2% of Zr element and the balance of Al element. The cold-rolled coiled material is sequentially subjected to solid solution treatment, quenching (multi-stage cooling), straightening and pre-aging, and a first finished coiled material is obtained; and the first finished coiled material is subjected to differential temperature heating artificial aging treatment, and the aluminum alloy plate is obtained. The production efficiency of the preparation method is high, and the comprehensive performance of the obtained aluminum alloy plate is good.

The invention discloses a special high-strength titanium alloy powder core wire for additive manufacturing and a preparation method of a component of the special high-strength titanium alloy powder core wire. The method comprises the following steps: 1, selecting a TA1 titanium belt as a sheath, and selecting Al powder, Cu powder, Fe powder, C powder and LaB6 powder as internal fillers; 2, ball-milling and uniformly mixing to obtain mixed powder; thirdly, a TA1 titanium strip is rolled into a U-shaped groove, then the mixed powder is fed into the U-shaped groove, and primary wires are obtained through rolling of a roller; fourthly, after the primary wire is subjected to rotary swaging, multi-pass online annealing and rolling reducing are conducted, and the titanium alloy powder core wire is obtained; and fifthly, the titanium alloy component is obtained through additive manufacturing. C powder is introduced into the internal filler to improve the fluidity of the internal filler, rotary swaging and multi-pass low-temperature short-time on-line annealing are combined to compact gaps and gradually weaken stress, nucleation is promoted through Cu powder and Fe powder in the internal filler, the mechanical property anisotropy of a component is improved, and the mechanical property of the component is improved. And the strength of the component is improved through solid solution strengthening of the Al element and strengthening of a strengthening phase, and the method is suitable for the field of additive manufacturing.

This invention discloses a novel ultra-thin strip of 301 stainless steel and its preparation method, belonging to the field of advanced high-strength steel technology. The strip composition by mass percentage is: 0.1–0.2% C, 0.4–0.5% Si, 1–2% Mn, 1–1.5% Al, 15–18% Cr, 8.0–9.0% Ni, 0.1–0.2% Mo, with the balance being Fe and impurities. The preparation method involves: forging the steel ingot at 1100℃–1200℃, followed by low-temperature hot rolling at 600℃–800℃, pickling, and then cold rolling at 150℃–200℃ with a pulsed current, resulting in a reduction of 90%–95%. This invention improves stacking fault energy through compositional regulation, inhibits martensitic phase transformation, and induces twinning deformation; the pulsed current promotes regular dislocation movement; and the Al element grain boundary segregation forms a micro / nano layered structure, achieving a synergistic effect of twin refinement and layered toughening. The resulting ultra-thin strip has a tensile strength of 1100MPa to 1200MPa and an elongation of 40% to 50%, overcoming the contradiction between strength and plasticity, and is suitable for high-performance elastic components in the fields of electronics and aerospace.

The application discloses a single-phase beta-phase adhesive layer alloy for high-temperature alloy and application thereof, and belongs to the technical field of material surface modification and coating. The single-phase beta-phase adhesive layer alloy is characterized by the following chemical components and mass percentages: 19.5-19.0 two percent of Al, 10.5-10.0 wt% of Co, 7.4-6.9 wt% of Cr, 1.0-0.8 wt% of Ta, 0.3-0.2 wt% of Ti, and the rest of Ni. The adhesive layer alloy is composed of single-phase beta phase at 800 DEG C. The application is based on a nickel-based high-temperature alloy, and the content of Al elements in the alloy is increased on the premise that the element composition of the beta phase is determined, and finally the composition of the single-phase beta-phase adhesive layer is determined. The beta phase is based on the NiAl phase and contains a large amount of Al elements, which can provide sufficient Al elements for generating an Al2O3 film on the surface of the adhesive layer.

In order to solve the problems existing in the prior art, common hot rolled steel, carbon manganese steel and low-carbon microalloyed steel are creatively subjected to Al alloying, the difference of free energy of transformation from austenite to ferrite is reduced through addition of the Al element, the free energy is about 140 mol / J, and the content of the Al element in the hot rolled steel is greatly reduced. During thermal deformation, austenite is subjected to phase transformation to induce ferrite phase transformation, so that the difficulty is reduced, and the possibility of deformation-induced ferrite phase transformation is improved. Besides, a certain content of ferrite delta ferrite is obtained within the thermal deformation temperature range (1200-800 DEG C) by adding the Al element, the ferrite delta ferrite is expected to be recrystallized during thermal deformation, fine crystal grains are obtained, and refining of the whole structure is achieved.

The invention provides a high-temperature-resistant anti-stripping gradient coating as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a Co-Ni-Cr-Mo-Al high-entropy alloy transition layer on a nickel-based high-temperature alloy substrate by adopting laser cladding, remelting and polishing; and then high-speed laser cladding is conducted on the surface of the transition layer, laser remelting and polishing are conducted under the specific low oxygen partial pressure, the Fe-Cr-Al-Si-B-C amorphous composite functional layer is prepared, the Al element is promoted to be preferentially oxidized through accurate control over the oxygen content, and nanometer Al2O3 particles distributed in a dispersed mode are generated in situ. The prepared coating comprises the matrix layer, the transition layer and the functional layer from bottom to top, has continuous gradient transition of components and tissues, effectively relieves thermal stress and is high in bonding strength. The coating has excellent high-temperature oxidation resistance, thermal shock resistance, high hardness and toughness, and is especially suitable for long-acting protection of aero-engine blades, gas turbine hot end components and the like in extreme environments.

The invention belongs to the technical field of titanium alloy materials, and particularly relates to a high-strength and high-plasticity alpha + beta double-phase titanium alloy based on collaborative evolution strengthening of multiple metastable phases and a preparation method of the high-strength and high-plasticity alpha + beta double-phase titanium alloy. The titanium alloy comprises the following chemical components in percentage by mass: 5.5 to 6.5 percent of Al element, 1.8 to 2.2 percent of Fe element, 2.3 to 2.7 percent of Nb element, 1.3 to 1.7 percent of Mo element, 1.3 to 1.7 percent of V element, 1.3 to 1.7 percent of Zr element and the balance of Ti. Solution quenching treatment is carried out in an alpha + beta two-phase region to obtain multiple metastable phases, and then aging treatment is carried out at 350-500 DEG C for 0.25-24 hours. According to the high-strength titanium alloy and the preparation method thereof, the alloy strength is greatly controlled and adjusted within the range of 1200-1800 MPa through cooperative regulation and control of various metastable phases, and therefore the performance bottleneck of a traditional high-strength titanium alloy in the aspect of strength and plasticity matching is broken through.

The application provides a high wear-resistant and corrosion-resistant copper alloy material and a preparation method thereof, and the material comprises the following components in percentage by weight: Cu 55-65%, Al 0.5-5%, Mn 2.0-4%, Si 2.0-5%, Fe≤0.35%, Ni≤0.25%, and the balance is Zn and inevitable impurities. By adding Mn, Si, Al and other elements in the copper alloy, a β phase matrix and a hard wear-resistant phase such as Mn-Si compound are formed, which can effectively hinder dislocation movement, improve the hardness and wear resistance of the material; the Al element can refine the grain, reduce the casting defects, and improve the yield strength and toughness. The preparation method comprises the steps of raw material weighing, smelting and centrifugal casting, and the obtained casting has a dense and uniform structure. The material has significantly improved wear resistance and corrosion resistance, and the service life can be improved by more than one time under the same working condition, and is suitable for high-load wear-resistant parts such as metallurgical rolling mills, hydraulic systems and large bearings.

A solder, and a laser welded joint and a manufacturing method therefor capable of ensuring excellent joint strength and toughness after butt welding and hot-stamping quenching of a steel sheet having an aluminum coating. During formation of the laser welded joint, when two steel sheet base metals are butt-welded by laser welding, a laser welding solder is added to a weld pool to form an initial weld seam, and the initial weld seam is quenched to form the laser welded joint. At least one of the steel sheets is a steel sheet having an aluminum coating or an aluminum alloy coating. The internal lath martensite volume fraction of the laser welded joint is not less than 90%, the average mass fraction of Ni element is not less than 1.6%, the average mass fraction of Al element is not higher than 1.6%, and the average mass fraction of C element is lower than the C content of the steel sheet base metal. A final weld seam positive reinforcement h1 and a final weld seam negative reinforcement h2 formed by the laser welded joint do not exceed 0.4 mm.

The invention relates to total-cross-section fine-grain CrNi series gear steel and a manufacturing method thereof.Compared with traditional CrNi gear steel, the gear steel has the advantages that the Si content is reduced, the problem that traditional gears are low in carburizing efficiency is effectively solved, and due to the fact that trace Nb, N and Al elements are added, AlN and Nb precipitates can be increased, and the purpose of refining the grain size is achieved. The invention further relates to a preparation method of the total cross-section fine grain CrNi series gear steel. The total cross-section grain size of the product at high temperature is small, the problem of mixed crystals is avoided, a high-temperature carburizing process can be adopted, the carburizing time is shortened, and the carburizing efficiency is improved; the hardenability fluctuation is small, and part deformation is not prone to occurring; and cutting is easy.

The invention relates to a high-strength and high-plasticity easily-processed nickel-cobalt-based wrought superalloy and a preparation method thereof. The alloy comprises 18%-25% of Co, 11%-16% of Cr, 2.4%-3.4% of Al, 4.5%-6.5% of Ti, 0.8%-2% of W, 1.6%-3.2% of Mo, 0.5%-1.5% of Ta, 0%-1.5% of Nb, 0.001%-0.1% of C, 0.001%-0.05% of B, 0.001%-0.1% of Zr, 0-0.1% of Hf and the balance Ni, and the mass percent ratio of Al to Ti is smaller than or equal to 0.6. The sum of the mass percentages of W and Mo is 3-5%; the sum of the mass percentages of Nb and Ta is 0-2%; the ratio of the mass percent of the Co element to the mass percent of W + Mo is greater than or equal to 4; the ratio of the mass percent of the Al element to the mass percent of Nb + Ta is larger than or equal to 2, and the volume fraction of a gamma'strengthening phase of the high-temperature alloy is 40%-60%. The alloy element distribution in the gamma phase and the gamma'phase is adjusted through the reasonable element proportion, on one hand, the alloy has a large machining interval while the high gamma 'phase volume fraction is kept, and on the other hand, the alloy stacking fault energy is adjusted to make full use of the strengthening effect of the interaction effect of surface defects on the alloy.

The invention relates to slag for electroslag remelting, a nickel-based heat-resistant and corrosion-resistant alloy ingot and a method for controlling burning loss of Al and Ti, and belongs to the technical field of special metallurgy. The slag comprises the following components in percentage by weight: 45%-60% of CaF2, 10%-20% of CaO, 12%-25% of Al2O3, 3%-5% of MgO, 5%-15% of TiO2, 0.2%-1.0% of TiN, less than or equal to 0.5% of SiO2 and less than or equal to 0.5% of FeO. Through the mutual cooperation of the slag components, the excessive burning loss of the single element Al or Ti can be inhibited, so that the cooperative stable control of the two key elements is realized. Compared with a traditional method, the yield of the Al element can be stably increased to 95% or above, and the yield of the Ti element can be stably increased to 90% or above.