220 results about "Alloy composition" patented technology

Provided are a solder alloy, a solder paste, a solder ball, and a solder joint which have a low melting point, are excellent in ductility, shear strength, and heat cycle resistance, further suppress the occurrence of open defects, and in addition, have reduced residual voids even at the time of joining in a large area. A solder alloy has an alloy composition of, by mass %, Bi: 35.0 to 68.0%, Sb: 0.1 to 2.0%, Ni: 0.010 to 0.050%, Ge: 0.007 to 0.090%, with the balance being Sn. Preferably, the alloy composition further contains, by mass %, at least one of Co, Ti, Al, Mn, As, Fe, Pd, Zn, Zr, Pb, In, Ce, P, and Ga: 0.1% or less in total. Further, this solder alloy can be suitably used for solder pastes, solder balls, and solder joints.

This invention provides a powder material that improves flowability and particle breakage strength compared to existing technologies. The powder material of this invention has a dendritic structure (1). The dendritic structure (1) has a superhard alloy composition or a cermet composition.

This invention provides a method for preparing a titanium-tin master alloy with tin segregation suppression and a cooling device. The preparation method includes: (1) pressing a molten blank; (2) smelting and refining to obtain an alloy melt; (3) casting and cooling: after turning on the cooling device, the alloy melt is poured into the cooling device, cooled, and then demolded to obtain a titanium-tin master alloy; the outer surface and the interior of the cooling device are equipped with water-cooling units. This invention utilizes the raw material structure of "titanium-tin core" to effectively reduce the occurrence of tin seepage in the crucible, reduce tin raw material loss, and improve the accuracy of alloy composition; combined with the cooling device to achieve internal and external synergistic cooling, it can effectively suppress tin atom diffusion, prevent the occurrence of tin element anti-segregation in the traditional smelting process, enhance the uniform distribution of tin element in the titanium-tin alloy ingot, and control the tin element content deviation in the titanium-tin alloy ingot within 2wt%.

The application provides an amorphous alloy magnetocaloric performance prediction method and system based on interpretable machine learning, relates to the technical field of material science and engineering, and comprises the following steps: step 1, constructing an amorphous alloy magnetocaloric performance data set, wherein the data set comprises alloy composition data, physical and chemical descriptors, external conditions and structural characteristics of a plurality of amorphous alloy samples and corresponding experimental values of maximum magnetic entropy change and Curie temperature; step 2, screening and optimizing the features in the data set, eliminating the collinearity between the features and performing recursive feature elimination to determine the final feature subsets for predicting the maximum magnetic entropy change and the Curie temperature respectively; and step 3, establishing machine learning models for predicting the maximum magnetic entropy change and the Curie temperature respectively through the final feature subsets, and training and optimizing the models to obtain the trained prediction models. The application realizes a closed loop of high-precision performance prediction, physical mechanism analysis and directional composition design.

This invention relates to the field of casting technology, and more particularly to a high-strength drive wheel casting process. The steps include: Step 1, alloy material preparation; Step 2, melting and micro-alloying treatment; Step 3, mold preparation and pouring; Step 4, solidification and cooling staged control; and Step 5, heat treatment process. By optimizing the alloy composition, improving the mold structure, precisely controlling melting and pouring, and adapting the heat treatment process, this invention solves the technical problems of insufficient strength, high defect rate, and poor forming accuracy in existing drive wheels. The invention also improves the structure and adapts the cooling chamber to the process, combining a controlled atmosphere cooling chamber with a staged cooling process. It incorporates partition isolation components, waste heat recovery components, and a temperature control unit, achieving independent partitioned cooling of the casting, precise temperature control, and waste heat reuse. This solves the problems of "airflow interference, uneven cooling, and energy waste" in existing cooling chambers.

The application discloses an alloy cushion block for a large walking beam heating furnace and a preparation method thereof, and the preparation method comprises the following steps: S1, determining the melting point of the alloy cushion block based on the atomic penetration depth of an alloy B containing FeO on multiple different alloy A with a melting point higher than that of the alloy B; S2, studying the load-bearing condition of the alloy cushion block to determine the required compressive strength; S3, designing the composition of the alloy cushion block; and S4, carrying out the industrial design of the alloy cushion block and starting smelting. Through reasonable alloy composition and production process design, the application provides a high-temperature heat-resistant alloy cushion block, improves the strength and melting point of the alloy cushion block, enables the alloy cushion block to maintain high strength at high temperature, solves the problem of FeO bonding in a molten state, reduces the phenomenon of heating furnace nodulation, and has universality and is suitable for various casting processes.

This invention relates to a design method and system for multi-principal element alloys with enhanced L12 phase dissolution temperature based on multi-scale features. The method obtains the optimal alloy composition by constructing a neural network model. This model uses the alloy composition-atomic scale descriptor L12 phase performance characteristics as input features, and the L12 phase interface fracture energy, L12 phase local thermal vibration entropy, and L12 phase interface phonon density of states overlap integral as output targets. The initial weights and thresholds of the neural network model are optimized using a genetic algorithm. The optimized weights and thresholds are then used to train the neural network model, resulting in a regression model for predicting L12 phase performance. This invention comprehensively demonstrates the enhanced thermal stability of the L12 phase from three dimensions—interface fracture resistance, atomic thermal vibration stability, and interface phonon matching—by outputting three unique physical parameters. This provides a new approach for the design of high-performance heat-resistant alloys and can be applied to the material development of hot-end components such as aero-engine turbine blades and gas turbine combustors.

This invention discloses a high thermal conductivity duplex cast steel housing for a high-speed permanent magnet motor and its preparation method. The high thermal conductivity duplex cast steel housing for a high-speed permanent magnet motor comprises the following components by weight percentage: C 0.3-0.45%, Cr 5-10%, Si 0.4-0.7%, Mn 0.5-1.5%, Mo 1-2%, Ni 2-3%, W 0.8-1.8%, Ti 0.05-0.1%, with the balance being iron and unavoidable impurities. This invention optimizes the alloy composition and controls the content of each element, while simultaneously applying a thermally conductive coating to the surface of the housing. This results in a housing with both excellent heat dissipation capacity and high-temperature strength, solving the problems of excessive temperature rise and thermal deformation of the housing under high-speed motor operation.

This invention provides a multi-element high-performance rapid extrusion magnesium alloy, its preparation method, and its applications. The multi-element high-performance rapid extrusion magnesium alloy, by mass percentage, comprises: 4-6 wt.% bismuth; 2-4 wt.% aluminum; 1.5-3.5 wt.% zinc; 0.2-1.2 wt.% tin; 0.2-1.2 wt.% element X, wherein element X is copper and / or silicon; magnesium; and unavoidable impurities. The preparation method of the multi-element high-performance rapid extrusion magnesium alloy includes: melting, two-stage homogenization heat treatment, and differential extrusion forming. This invention employs a non-rare earth multi-element alloying composition design combined with a two-stage homogenization + differential high-speed extrusion process. The resulting magnesium alloy is rare earth-free, low-cost, exhibits excellent synergistic strength and plasticity (tensile strength ≥340 MPa, elongation ≥15%), high processing efficiency and yield, a short process flow, compatibility with existing industrial equipment, and great potential for large-scale application.

The present invention provides solder alloys, solder pastes, solder balls, solder preforms, and solder joints that have excellent resistance to drop impact and heat cycling, suppress the occurrence of chipping, bridging, and icicle formation, and also suppress the occurrence of electromigration. [Solution] The solder alloy has an alloy composition consisting of, by mass%, Ag: 0.3~1.9%, Cu: 0.40~1.00%, Bi: 0.5~4.9%, P: 0.00100~0.02000%, and the remainder being Sn. The alloy composition may further contain Ge, Co, and Ga in amounts of 0.06% or less by mass, and at least one of each. The alloy composition may also further contain As, In, Zr, Mn, Ti, Zn, Fe, Al, Ni, Au, Mg, Cr, and Pt in amounts of 0.06% or less by mass, and at least one of each.

The application relates to a high-entropy alloy component design method and system covering the whole element periodic table, and the method comprises the following steps: collecting general material database resources in advance, extracting the core features and crystal graphs of the materials, and training a pre-trained large model; collecting and obtaining performance data of multi-element alloys, and constructing a probe test set; the probe test set is divided into multiple subspaces according to element types and phase structures; the pre-trained large model is used for alloy performance prediction in each subspace, and high-performance subspaces are screened out according to the prediction results; an optimization algorithm is used for alloy component optimization in each high-performance subspace; the restrictions on raw material elements and target alloy characteristics are added to ensure the solid solution of the target alloy; the verification is carried out through a theoretical calculation and an experimental verification method, and if the verification is passed, the high-entropy alloy component is finally obtained. Compared with the prior art, the application has the advantages of reducing the data cost of high-entropy alloy component design, being accurate and being able to effectively guide experiments.

The present application relates to the process for eliminating the aluminum scraps on the surface of the continuous extruded aluminum alloy flat tube, by optimizing the aluminum alloy composition: Cu: 0.09-0.12%, Si: 0.03-0.05%, Fe: 0.12-0.17%, Fe: Si >= 3, Ti: 0.006-0.0075%, Ce and La mixed rare earth: 0.045-0.055%, the balance being Al, to improve the aluminum rod casting performance and the uniformity of the structure; at the same time, the refining process of adding rare earth in the furnace and adding aluminum titanium boron wire online is combined, so as to ensure that the porosity of the aluminum rod reaches 1 level. The ultra-high-speed online homogenization heat treatment is adopted, so that the chemical composition of the aluminum rod is homogenized in a very short time, and the intracrystalline segregation is eliminated. While improving the fluidity of the metal, the extrusion process parameters are optimized, the mold cooling process is changed, the extrusion temperature fluctuation is ensured to be in the minimum range, and constant temperature extrusion is realized; and the surface of the flat tube is treated online after the product is formed, and finally the technical purposes of eliminating the aluminum scraps on the surface of the aluminum flat tube and reducing the pressure pit defects are achieved.

This invention relates to the field of alloy forming technology, specifically to a method for preparing Ti-Al medium-entropy alloys based on selective laser melting. The method includes preparing raw material rods, gas atomization powder preparation, 3D modeling, preheating and forming the matrix, powder spreading and leveling, 3D printing pretreatment, pre-powder spreading, and laser printing. This method features high melting rate and high solidification rate, forming unique microstructures such as ultrafine grain structure, metastable phases, and supersaturated solid solutions. By combining alloy composition design, gas atomization powder preparation, and selective laser melting, the resulting parts possess excellent comprehensive mechanical properties and can be used to prepare complex structural parts. Furthermore, it features a short preparation cycle, high material utilization, and rapid forming.

This invention relates to a method for producing support roll steel, belonging to the field of metallurgical industry, and solves the problems of high cost and severe shrinkage porosity in existing support roll steel. The method for producing support roll steel includes: smelting, deoxidizing, desulfurizing, and refining the support roll steel ingot raw material, adjusting the alloy composition to obtain a first portion of support roll steel molten steel, tapping the steel, vacuum casting, and solidifying to obtain a solidified billet shell and liquid steel inside the billet shell; smelting, deoxidizing, desulfurizing, and refining the support roll steel ingot raw material, adjusting the alloy composition to obtain a second portion of support roll steel molten steel, tapping the steel, mixing the second portion of support roll steel molten steel with the liquid steel inside the billet shell within the solidified billet shell of the first portion of support roll steel, vacuum casting, solidifying to obtain a complete support roll steel ingot, demolding, removing the sprue, forging, removing the riser, heat treating, and machining to obtain the support roll steel; the composition of the first portion of support roll steel and the second portion of support roll steel molten steel differs.

This invention discloses a hot-rolled steel sheet for vacuum train tubes that exhibits excellent yield strength, weldability, low-temperature toughness of the welded portion, vibration damping ratio, and is free from hot cracking. The hot-rolled steel sheet according to this invention is characterized in that its alloy composition, by weight percent, comprises: C: less than 0.06% (more than 0%), Si: 0.5-1.5%, Mn: 1.2-2.2%, Cu: 0.5-1.5%, Ni: more than 0.25%, Ti+Nb+V: less than 0.02% (inclusive of 0%), the balance being Fe and unavoidable impurities.

This invention relates to a high-temperature corrosion-resistant Fe-Cr-Mo-Ni alloy, its preparation method, and its applications. The alloy composition is 37%–40% Ni, 19%–29% Cr, and 5%–10.27% Mo, with the balance being Fe and trace impurities. X-ray diffraction of the alloy reveals a single-phase face-centered cubic structure. After holding at 800℃ for 400 hours, the area fraction of the σ phase in the microstructure does not exceed 5%. The breakdown potential in 3.5% NaCl solution is as high as 1.029 V, and its pitting corrosion resistance is superior to commercial 904L stainless steel. This alloy shows great promise for industrial application in the preparation of high-temperature resistant structural components operating under high corrosion conditions above 400–900℃, especially in service environments containing chloride ions, fluoride ions, or sulfides.

The application discloses a high-temperature-resistant beryllium copper alloy for microswitches and a preparation method thereof, and belongs to the technical field of electronic component manufacturing. The alloy composition is as follows in terms of percentage by weight: Be 0.20%-0.50%, Co 1.20%-1.30%, Ni 3.20%-3.50%, W 0.30%-0.50%, Fe 0.12%-0.15%, Zr 0.16%-0.20%, Y 0.12%-0.15%, B 0.010%-0.015%, Pb≤0.003%, Sn≤0.003%, total impurities≤0.01%, and the balance being Cu. The preparation method comprises the following steps: 1280-1300 DEG C. smelting, 1620-1650 DEG C. high-temperature refining, homogenization treatment, hot rolling, annealing, solid solution, twice cold rolling and intermediate annealing, two-stage aging treatment, and finally, a strip with a thickness of 0.5-2.0 mm and an average grain size of 5-7 um is obtained. The obtained product has a yield strength of ≥980 MPa, a tensile strength of ≥1200 MPa, an elongation of ≥5%, and an elastic modulus of ≥115 GPa, and has excellent high-temperature strength, elastic stability and stress relaxation resistance.

This invention proposes a method to improve the grain size uniformity of GH2026 bars. The method employs vacuum induction + low-temperature casting electrode + electroslag remelting. In the vacuum induction stage, the alloy composition is precisely controlled, with the Ti / Al ratio limited to 10–12 to reduce the risk of uneven γ′ phase precipitation. Trace amounts of B and Zr are added to refine grain boundaries and inhibit solute segregation. In the electroslag remelting stage, a CaF2-Al2O3-CaO slag system is used to reduce the content of harmful elements and alleviate macroscopic segregation. The casting process uses a lower-than-conventional casting temperature of 1420–1450℃ to avoid excessive dendrite growth, break up nascent dendrite arms, and promote uniform diffusion of solute elements. Two homogenization annealing processes are performed before and after forging to further improve dendrite segregation, resulting in GH2026 bars with a grain size of grade 9, significantly improving their service performance for fasteners.

The application discloses a low magnetic permeability amorphous alloy, characterized in that the low magnetic permeability amorphous alloy is formed by segmental magnetic field heat treatment of an iron-based alloy disordered structure strip, and the alloy composition of the iron-based alloy disordered structure strip is Fe-Si-B-M, wherein M is one or more of C, Co, Nb, Mn, Cu and Ni. The application reduces the dislocation dipole density of the alloy, improves the structural disorder, effectively releases the internal stress, and combines the uniform magnetic anisotropy induced by the segmental magnetic field, so as to realize the low magnetic permeability and low loss of the amorphous alloy. The application further discloses a preparation method of the low magnetic permeability amorphous alloy and application of the low magnetic permeability amorphous alloy to a hybrid magnetic circuit distribution transformer.

This invention belongs to the field of materials science and engineering, and relates to an NS-TNV40 neutron-transparent alloy for high-temperature neutron scattering experiments. The alloy's composition, by weight percentage, is 39.24% Ti, 39.24% Nb, and 21.52% V. Its preparation includes batching, melting, homogenization, and forging. The alloy has a theoretical melting point of 1716℃, exhibits no neutron diffraction peaks after holding at 1000℃ for 100 hours, and demonstrates excellent high-temperature stability. It maintains a single-phase structure without phase transformation after 100 hours of service at 1000℃. It also exhibits good high-temperature oxidation resistance, with oxidation weight gain lower than that of high-purity V and VNi alloys. Mechanically, it combines high strength and high plasticity. This alloy can avoid interference from the scattering signals of the sample container itself, improve the quality of neutron scattering data, meet the requirements of high-temperature in-situ experiments, and promote the development of high-temperature neutron scattering experimental technology.

The application discloses a high-strength 7-series aluminum alloy and a preparation method thereof. The 7-series aluminum alloy is composed of the following components in percentage by mass: Zn 6.0-6.5%, Mg 2.1-2.5%, Cu 2.0-2.5%, Mn 0.20-0.30%, Ti 0.10-0.15%, Cr 0.10-0.20%, Zr 0.10-0.15%, rare earth elements 0.02-0.10%, wherein the rare earth elements are a mixture of La and Ce, and the balance is Al and inevitable impurities, wherein Fe < 0.15% and Si < 0.15%. By optimizing the main alloy components, adjusting the trace element ratio, and adopting multiple process means such as micro-alloying and deformation heat treatment, a high-strength aluminum alloy is prepared.

This application provides a short-process heat treatment process for magnesium alloys, belonging to the field of magnesium alloy preparation. The process includes: alloy casting of magnesium alloy raw materials to obtain a magnesium alloy ingot; the chemical composition of the magnesium alloy ingot, by mass fraction, includes: Gd: 6.51%–8.99%, Y: 0.8%–1.0%, Zr: 0.3%–0.5%, impurity elements ≤0.1%, Mg, Zn; solution treatment of the magnesium alloy ingot to obtain a solution-treated magnesium alloy; the solution treatment holding temperature is 460℃–480℃, and the holding time is 6h–8h; aging treatment of the solution-treated magnesium alloy to obtain an aged magnesium alloy; the aging treatment temperature is 200℃–210℃, and the time is 10–12h. This application, through the synergistic design of alloy composition and heat treatment process, significantly shortens the heat treatment process while achieving a good balance between strength and ductility in the magnesium alloy.

The present application relates to the technical field of material performance prediction, and discloses a method for predicting high-temperature oxidation film stability of an alloy based on theoretical calculation, comprising the following steps: S1: obtaining stable oxides actually formed on the surface of the alloy, corresponding molar mass, metal atom number, density of the alloy, and average atomic weight of the alloy for the alloy composition and a preset high-temperature oxidation environment; S2: obtaining the theoretical density of the oxides according to the initial crystal structure of the oxides; S3: obtaining key parameters for evaluating the protection performance of metal oxides; S4: when the key parameters are less than or equal to a first preset value, the high-temperature oxidation film stability of the alloy is poor; when the key parameters are greater than the first preset value and less than a second preset value, the high-temperature oxidation film stability of the alloy is good; and when the key parameters are greater than or equal to the second preset value, the high-temperature oxidation film stability of the alloy is poor. The present application can efficiently, at low cost, and in advance, screen high-performance oxidation-resistant alloys.

This invention provides a high-strength, high-ductility 7075 aluminum alloy and its preparation method, belonging to the field of additive manufacturing. The alloy composition, by mass percentage, is: Zn: 7.5-8.5%, Mg: 2.7-3.7%, Zr: 1.0-3.0%, Cu: 1.5-2.5%, Ti: 0.7-1.3%, Y: 0.1-0.4%, with the balance being Al and unavoidable impurities, the impurities being ≤0.02%. The alloy preparation method includes: forming under high-purity argon protection using laser powder bed melting process, solution treatment, and aging treatment. The alloy has an average grain size ≤2.1μm and a three-peak structure, consisting of columnar crystals (5%-25% area), coarse equiaxed crystals (30%-60% area), and fine equiaxed crystals (35%-55% area). The 7075 aluminum alloy possesses high-density nanoscale η-Mg(Al,Zn,Cu)2 phase (radius ≤ 19 nm), primary L12-Al3Zr phase (radius ≤ 50 nm), and secondary L12-Al3Zr phase (radius ≤ 2.9 nm). The alloy exhibits a tensile strength ≥ 515.9 MPa and an elongation ≥ 12.7%, achieving a synergistic improvement in both strength and ductility.

Nickel-based alloy composition for additive manufacturing and additive-manufactured parts made from nickel-based alloy, comprising 36-89 wt% nickel, 4-9 wt% aluminum, 6-14 wt% cobalt, 4-26 wt% chromium, 2-5 wt% tantalum, and 3-13 wt% tungsten. The nickel-based alloy composition has a crack density of 4.0 cracks / mm². 2 To provide additive manufacturing parts having a crack density of less than 1.

The application discloses a kind of saturation magnetic induction prediction of iron-based amorphous alloy, component design and super-high saturation magnetic induction iron-based amorphous / nanocrystalline alloy. Through machine learning model XGBoost combined with SHAP analysis reveals the core role of ferromagnetic element content, alloy mixing enthalpy and electronegativity difference, while maintaining high ferromagnetic element content, without deteriorating amorphous forming ability, after annealing can obtain very low coercivity, realize high saturation magnetic induction and amorphous forming ability, the synergistic optimization of coercivity. The parameters used in the composition design criteria proposed by the application do not require experimental data and can be calculated directly from the alloy composition. Combined with machine learning model, high-performance components can be quickly screened, significantly reducing the development cycle and cost of traditional trial-and-error method, providing systematic theoretical guidance for the development of high-performance soft magnetic materials and improving industrial feasibility.

The application relates to a preparation method of a high-density graphite-based dissipation heat-resistant composite material. In order to solve the problems of high cost of the existing dissipation heat-resistant composite material and poor ablation resistance of the graphite dissipation heat-resistant composite material, the preparation method comprises the following steps: mixing multi-element dissipation agent raw materials, uniformly mixing the multi-element dissipation agent raw materials, loading the multi-element dissipation agent raw materials into a graphite crucible, processing a high-density graphite base into a shape to be prepared, mounting the high-density graphite base on a lifting rod of a vacuum infiltration furnace, preparing a dissipation agent alloy melt, and immersing the graphite base in the dissipation agent alloy melt to obtain the high-density graphite-based dissipation heat-resistant composite material. The high-density graphite-based dissipation heat-resistant composite material is prepared by using the vacuum infiltration method, high-purity graphite is used as the base, the composition of the dissipation agent alloy is adjusted, the dissipation agent is wetted with the graphite base, and the ablation resistance of the workpiece is improved. The application can be used for preparing aircraft engine nozzle throat liners, aircraft nose cones and wing leading edges and the like components.

This invention discloses a method for preparing high-temperature resistant aluminum alloy ingots based on smelting optimization control, relating to the field of aerospace aluminum alloy technology. The method includes the following steps: S1, obtaining smelting aluminum alloy raw materials, pre-treating the raw materials, and setting hard qualification index parameters for the target product. These hard qualification index parameters are divided into process safety and metallurgical performance categories. S2, obtaining the material properties of the aluminum alloy raw materials, using the material properties and hard qualification index parameters as inputs. This invention proposes a method for preparing high-temperature resistant aluminum alloy ingots based on smelting optimization control. Based on a customized differential evolution algorithm, it fully considers the strong coupling nonlinear relationship between active element burn-off, compositional segregation, brittle phase formation, and inclusion control during aluminum alloy smelting. Through a phased directional mutation search and a constraint-priority double-layer screening iterative rule, the uniformity of alloy composition is significantly improved.