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891 results about "High entropy alloys" patented technology

High-entropy alloys (HEAs) are alloys that are formed by mixing equal or relatively large proportions of (usually) five or more elements. Prior to the synthesis of these substances, typical metal alloys comprised one or two major components with smaller amounts of other elements. For example, additional elements can be added to iron to improve its properties, thereby creating an iron based alloy, but typically in fairly low proportions, such as the proportions of carbon, manganese, and the like in various steels. Hence, high entropy alloys are a novel class of materials. The term “high-entropy alloys” was coined because the entropy increase of mixing is substantially higher when there is a larger number of elements in the mix, and their proportions are more nearly equal.

AlCoCrFeNiTix high-entropy alloy material and method for preparing same

The invention relates to a high-entropy alloy material and a method for preparing the same. The component of the high-entropy alloy material is AlCoCrFeNiTix, wherein x represents a molar ratio, and the value range is between 0.1-0.4. The method for preparing the material comprises: preparing raw materials, adopting the alloy smelting raw materials including Al, Co, Cr, Fe, Ni and Ti, and accurately weighing and proportioning according to the molar ratio; then, purifying oxide on a metal surface; putting the prepared raw materials into a tank in a water-cooling copper-formed mold smelting pool, vacuumizing, filling argon, controlling smelting current to be at about 250 ampere and smelting time for 30-60 seconds, turning an alloy block after alloys are fully mixed, putting an alloy ingot into a tank of a water-cooling copper-formed mold, regulating the smelting current, opening a suction casting air suction valve after the alloys are uniformly smelted, utilizing the negative pressure in a pump for suction casting, and taking out the alloy ingot after an alloy mould is cooled. Compared with the conventional crystalline state alloy, the high-entropy alloy material has relative high thermal stability, hardness, yield strength, breaking tenacity, plastic deformation and work hardening capacity.

Refractory high-entropy alloy/titanium carbide composite and preparation method thereof

The invention discloses a refractory high-entropy alloy/titanium carbide composite. A refractory high-entropy alloy serves as a matrix phase, and titanium carbide serves as a wild phase; and elements in the refractory high-entropy alloy are selected from at least four kinds of elements of W, Mo, Ta, Nb, V, Ti, Zr, Hf and Cr. A preparation method of the refractory high-entropy alloy/titanium carbide composite comprises the steps that at least four kinds of carbonization metal powder in tungsten carbide, molybdenum carbide, tantalum carbide, niobium carbide, vanadium carbide, the titanium carbide, hafnium carbide, zirconium carbide and chromium carbide are selected and mixed according to the equal molar ratio or the ratio close to the equal molar ratio to form high-entropy matrix powder; and after the high-entropy matrix powder and titanium powder are mixed, alloy mechanization is carried out, then spark plasma sintering or hot-press sintering is carried out, and the refractory high-entropy alloy/titanium carbide composite is obtained. The density and cost of the composite are reduced while the hardness of the composite is improved, excellent high-temperature performance is achieved, and the requirement for manufacturing a high-temperature structural component is met.

Nitrogen-strengthened TiZrHfNb-based high-entropy alloy and preparation method thereof

ActiveCN105671392AThe scope of application of large ingredientsBroad preparation conditionsCrucibleHigh entropy alloys
The invention provides nitrogen-strengthened TiZrHfNb-based high-entropy alloy and a preparation method thereof. The effect of strengthening interstitial atoms is achieved through the microalloyed N element, and thus the tensile strength of the alloy is remarkably improved. The technique comprises the following steps that metal raw materials including Ti, Zr, Hf and Nb are accurately weighed according to a molar ratio after oxide skin of the metal raw materials is removed through a mechanical method, other adding elements are accurately weighed according to a molar ratio after mechanical skin removal or ultrasonic cleaning or acid pickling is conducted on the adding elements, and the element N is added in a nitride form; and the target alloy is smelted in a non-consumable vacuum electro-arc furnace or a cold crucible shower furnace, and the alloy is obtained through vacuum suction-casting or casting equipment. According to the nitrogen-strengthened TiZrHfNb-based high-entropy alloy and the preparation method thereof, by innovatively adding the element N, the tensile property of the high-entropy alloy is remarkably improved, and particularly the tensile strength of (TiZrHfNb) 98N2.0 high-entropy alloy approximates to 1300 Mpa; and meanwhile, the plastic elongation is 10% or over, and the comprehensive tensile property of the nitrogen-strengthened TiZrHfNb-based high-entropy alloy is remarkably superior to that of existing high-entropy alloy systems.

High-entropy alloy hot-end part manufacturing method of turbine engine on basis of selective laser melting

ActiveCN104308153AMeet the requirements of gas temperature to form a large thrustSatisfy the requirement of increasing the gas temperature to form a large thrustTurbinesIncreasing energy efficiencySelective laser meltingSelective laser sintering
The invention discloses a high-entropy alloy hot-end part manufacturing method of a turbine engine on the basis of selective laser melting and belongs to the technical field of manufacture of hot-end parts of the turbine engine. The high-entropy alloy hot-end part manufacturing method includes firstly selecting five or more of eight kinds of high-melting metal powder of tungsten, titanium, zirconium, hafnium, vanadium, niobium, tantalum and molybdenum, and mixing the powder uniformly according to a certain mole ratio to obtain high-entropy alloy powder; setting up a three-dimensional solid model of a hot-end part of the turbine engine, slicing and layering by software to obtain profile data of various sections, and importing the data into a quick forming device; quickly forming a hot-end part blank of the turbine engine by the SLM technology; thermally treating and finely processing the blank to obtain the high-temperature high-entropy alloy hot-end part of the turbine engine. The formed hot-end part of the turbine engine has high compactness and excellent high temperature performance, has high forming accuracy and surface accuracy and can be quickly and accurately manufactured.

High-entropy alloy particle reinforced aluminum base composite material and stirring casting preparation process thereof

ActiveCN105478724AAvoid interfacial chemical reactionsAvoid formingHigh entropy alloysToughness
The invention discloses a high-entropy alloy particle reinforced aluminum base composite material and a stirring casting preparation process thereof. The preparation process adopts mechanical alloying to prepare high-entropy alloy powder and screen to obtain high-entropy alloy particles; the high-entropy alloy particles are sealed by adopting an aluminum alloy pipe having the same material with a basal body; the aluminum alloy pipe weighed in a segmented manner is added in the molten basal body; the high-entropy alloy particles are dispersed by a stirring mode; and the high-entropy alloy particle reinforced aluminum base composite material is prepared by a casting process. The high-entropy alloy particles are 0.1-35%; aluminum alloys are 65-99.9%; and the sum of the two is 1. The high-entropy alloy particles in the structure of the prepared composite material are uniformly dispersed; the high-entropy alloy and aluminum alloy interface bonding compatibility is excellent; the strength and the toughness are excellent; the preparation process is simple; the powder has no need to be treated; the cost is low; the stability is good; and the composite material is suitable for large-batch production and standard production, and is excellent in promotion and application prospect.

High-entropy alloy powder containing amorphous nanocrystalline and fabrication method thereof

The invention relates to high-entropy alloy powder containing amorphous nanocrystalline and a fabrication method thereof. A high-entropy alloy coating is composed of, by atomic percent, 14.3% of Al, 14.3% of Fe, 14.3% of Co, 14.3% of Ni, 14.3% of Cr, 14.3% of Mo and 14.2% of Si, and the total percentage is 100%. The fabrication method includes the following steps: S1, high-entropy alloy master alloy is fabricated through a medium-frequency induction smelting technique, wherein weighed metallic raw materials are put in a carborundum crucible in sequence and according to melting points from low to high, then the carborundum crucible is vacuumized until the pressure is lower than 6.0*10MPa; argon gas is inflated in the carborundum crucible, the metallic raw materials are melted under the condition that the pressure of the argon air is 3*10-2 Pa, the smelting current is 75A, the melting time is 25min, the alloy composition is segregated with the assistance of electromagnetic stirring, the alloy composition is poured into a magnesia framework after the alloy composition is melted completely, and the high-entropy alloy master alloy which is even in ingredients is obtained; S2, high-entropy alloy powdered materials are fabricated through gas atomization equipment. The fabrication method of the high-entropy alloy powder is used for fabricating the high-entropy alloy coating containing the amorphous nanocrystalline or bulk alloy materials of more superior performance.

High-entropy alloy for sewage degradation and preparing method thereof

ActiveCN105088048ARaise the ratioStrong degradation efficiencyWater/sewage treatmentIron powderHigh entropy alloys
The invention discloses high-entropy alloy for sewage degradation and a preparing method thereof. The high-entropy alloy at least comprises four components and at least comprises one active metallic element which is Mg, Ca or Zn, and the components are matched based on an equi-atomic ratio or approximate-equi-atomic ratio. The high-entropy alloy is prepared through mechanical alloying. The technology is simple, smelting is not needed, and preparing cost is low. The high-entropy alloy is different from ordinary high-entropy alloy systems in that a dinitrogen bond is broken through redox reaction between the active zero-valent metallic element and the -N=N- perssad in organic synthetic dyestuff, so that a high rate is realized for azo dyestuff and a remarkable effect is realized for degradation of materials similar to organic synthetic dyestuff, and degradation efficiency is improved by over 250 times compared with commercial iron powder which is in common use currently. The composition range of the high-entropy alloy is wide, and appropriate composition adjustment can be conducted according to actual needs. Meanwhile, the high-entropy alloy is high in structural stability and suitable for various working environments and has broad industrial application prospects in sewage treatment.
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