183 results about "Fe element" patented technology

The invention discloses a high-entropy perovskite oxide catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The chemical general formula of the high-entropy perovskite oxide catalyst is La (MMN) O3, and M is a transition metal element with high electronegativity. M is a mixture of Ni, Cu, Co and Fe elements. The molar ratio of La to Ni to Cu to Co to Fe to Mn is (0.9 to 1): (0.15 to 0.25): (0.15 to 0.25): (0.15 to 0.25): (0.15 to 0.25): (0.15 to 0.25): (0.15 to 0.25). The La (MMN) O3 catalyst is of a rod-shaped structure formed by stacking particles. According to the high-entropy perovskite oxide catalyst as well as the preparation method and the application thereof, the B site of perovskite is doped by the high-electronegativity transition metal element, so that the Mn-O covalence is enhanced, and the catalytic performance is improved; the catalyst is prepared in an electrostatic spinning and calcining mode, a rod-shaped structure with accumulated nano-particles is obtained, the surface area of the catalyst is increased, and the catalytic effect is improved.

The invention discloses an ultra-wideband carbon / boron doped high-entropy alloy wave-absorbing material which is prepared by adjusting Fe and Ni elements, adding Si and Al elements and doping a small amount of C or B. The specific component of the wave-absorbing material is (FeaCobSicAldNie) 100-xMx. In addition, the invention also discloses a preparation method of the wave-absorbing material, and the preparation method comprises the following steps: 1, high-entropy alloy smelting; 2, preparing high-entropy alloy spherical powder; 3, carrying out flaky treatment; and 4, stress relief annealing. On the basis of FeCoNi medium-entropy alloy, the content of the Fe element with low cost is increased, the content of the Ni element with high cost is reduced, the Si element and the Al element are added at the same time, then a small amount of non-metal C and B elements are doped to serve as interstitial atoms, lattice distortion is increased, the wave-absorbing performance and corrosion resistance are improved, and the ultra-wideband carbon / boron doped high-entropy alloy wave-absorbing material is obtained.

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

The invention provides salt-spray-resistant steel, a preparation method and application of the salt-spray-resistant steel. The salt-spray-resistant steel sequentially comprises an alloy matrix, a permeable layer and an anti-corrosion coating from inside to outside. The alloy matrix comprises an Fe element; the permeable layer comprises Fe, N and O elements; the anticorrosive coating covers at least the surface of the permeable layer. The steel has the characteristics of high strength and salt spray resistance, the binding force of the coating and a matrix is good, the thickness of the anti-corrosion coating is greatly reduced under the condition that the anti-corrosion requirement of the CX grade is met, the machinable performance of a workpiece is effectively improved, and the adverse effects that the workpiece meshing force is poor, and the surface is not uniform due to the thick coating are avoided.

The invention discloses a preparation method of an aluminum alloy cast rod. The preparation method comprises the following steps: mixing and melting an intermediate alloy containing an aluminum element, an intermediate alloy containing a Mn element and an intermediate alloy containing a Fe element; an online refiner is added; carrying out refining treatment on the molten liquid, and carrying out slagging-off operation to remove impurities; an intermediate alloy containing the Ce element is added into the molten liquid obtained after refining and slagging-off, and the final adding amount of the Ce element in the aluminum alloy casting rod is 0.3-1 wt% by mass; and the melt added with the Ce element is filtered, the treated melt is cast, and the aluminum alloy cast rod is obtained. The strength, the tensile strength and the yield strength of the aluminum alloy modified through the method are all remarkably improved.

The invention relates to the technical field of aluminum alloy materials, and discloses a high-strength regenerated aluminum alloy profile for an automobile anti-collision beam and a preparation process of the high-strength regenerated aluminum alloy profile for the automobile anti-collision beam, and the profile is 6063 alloy and comprises the following raw materials in percentage by mass: 45-55% of waste aluminum and 0.3-0.6% of Si; 0.5%-0.8% of Mg; 0 to 0.1 percent of Zn; 0 to 0.08% of Cu; 0 to 0.08% of Mn; 0.2%-0.45% of Fe; 0.01%-0.06% of Ti, and the balance Al and impurities with the content lower than 0.05%. The profile is obtained by carrying out casting, homogenization, extrusion, straightening, solid solution treatment and aging treatment on raw materials. According to the high-strength regenerated aluminum profile prepared through the scheme, the adding proportion of the waste aluminum can reach 45%-55%, the highest Fe content can reach 0.35% of the upper limit in the range of GB / T 3190-2020, the technical bottleneck that under the condition of the high waste proportion, the Fe element is excessive, thick intermetallic compounds are easily formed, and consequently the formability of the profile is poor is broken through, and harmless or beneficial conversion of the Fe element is achieved. And the section bar obtained by the scheme is a regenerated aluminum section bar with higher strength, high forming performance and low carbon emission factors, and unification of technology, economy and environment is realized.

The invention provides an aluminum alloy wire and a preparation method thereof. The aluminum alloy wire comprises the following elements in percentage by mass: 0.1 to 7.0 percent of Zn element, 0.2 to 9.6 percent of Mg element, 0.1 to 6.0 percent of Cu element, 0.01 to 1.2 percent of Mn element, 0.1 to 2.0 percent of Fe element, 0.1 to 2.5 percent of Si element, less than or equal to 0.15 percent of inevitable impurities and the balance of Al element, the surface brightness L of the aluminum alloy wire is greater than 60, and the surface brightness color difference E is less than or equal to 0.5; the average roughness Sa is less than or equal to 0.4 mu m, and the maximum peak height Sp is less than or equal to 2.0 mu m; the aluminum alloy wire does not crack after 85% compression deformation; under the test conditions that the temperature is 35 DEG C, and the aluminum alloy wire is placed in a mixed solution of a 57g / L NaCl solution and a 10mL / L H2O2 solution to be soaked for 6 hours, the corrosion depth of the aluminum alloy wire is smaller than or equal to 10 micrometers.

The present invention discloses a non-heat-treated high-toughness Al-Si alloy die-casting material and its manufacturing process. The alloy can effectively suppress the adverse effect of Fe element by controlling the Mn / Fe ratio within a certain range. In addition, rare earth is introduced at a certain ratio to effectively refine the Si in the material and form a high-temperature phase together with elements such as Al·Cu, so that the material can improve the deformation resistance when applied to large structural parts integrally molded by die-casting. After sampling and testing the main body of a large die-casting product, the F material of the alloy can reach a tensile strength of 290 MPa, a yield strength of 140 MPa, and an elongation of 13%, which not only has excellent die-castability, but also meets the standard of low carbon emissions due to the use of clean energy.

The invention provides a regeneration method of an aluminum-silicon alloy, a regenerated silicon-aluminum alloy and an iron-rich phase alloy. The regeneration method comprises the steps that S1, raw materials of the aluminum-silicon alloy are smelted, and a first melt is obtained; s2, an aluminum-manganese intermediate alloy and an aluminum-chromium intermediate alloy are added into the first melt, and a second melt is obtained; the second melt contains Fe element, Mn element and Cr element; s3, refining treatment is conducted on the second melt, and a third melt is obtained; and S4, the third melt is added into a casting mold, mechanical vibration is conducted on the casting mold under the vibration condition so that the third melt can be solidified, and the regenerated aluminum-silicon alloy and the iron-rich phase alloy are obtained. Vibration equipment is used for applying a vibration field to the casting mold, and meanwhile, the proportion of alloy elements and the smelting process are accurately controlled in a matched mode, so that preparation of the low-iron secondary aluminum-silicon alloy is achieved.

The invention relates to the field of titanium metallurgy, in particular to a vacuum consumable smelting method for a titanium alloy cast ingot and the titanium alloy cast ingot obtained through the method. According to the vacuum consumable smelting method for the titanium alloy cast ingot, based on the VAR titanium alloy smelting technology, an electrode block partition differentiation batching mode is adopted for the problem of component uniformity of the Fe element and the O element in the titanium alloy cast ingot, the segregation degree of the Fe element and the O element in the titanium alloy cast ingot is effectively controlled, and the quality of the titanium alloy cast ingot is improved. And the target requirement of the high-homogeneity cast ingot on the uniformity of Fe and O element components is met. The method is suitable for smelting different specifications of TC4 and TC4ELI titanium alloy ingots, the metallurgical quality of the ingots is improved, high practicability and generalization performance are achieved, a raw material guarantee is provided for the downstream material forming machining procedure, application and popularization of TC4 and TC4ELI titanium alloy products in the aviation and medical field are effectively promoted, and the method is suitable for popularization and application of the TC4 and TC4ELI titanium alloy products in the aviation and medical field. Therefore, certain economic benefits are created for enterprises.

The invention relates to the technical field of preparation of high-entropy alloy coatings, in particular to a preparation method of a high-entropy alloy coating, which comprises the following steps: by taking a Q235 carbon steel plate as a substrate, carrying out cladding operation on a high-entropy alloy stranded welding wire only containing four components of Al, Co, Cr and Ni through laser cladding; wherein the AlCoCrFeNi high-entropy alloy coating with different Fe proportions is prepared by changing the wire feeding speed of the laser cladding. According to the method, the proportion of the Fe element of the substrate in the high-entropy alloy coating can be controlled by changing the wire feeding speed of laser cladding, the components of the coating are regulated and controlled, the high-entropy alloy coating with different mechanical properties and corrosion resistance can be prepared, the requirements of different application scenes are met, the laser fuse cladding method is adopted, and the production cost is reduced. The method has the advantages of high efficiency, accuracy and automatic operation, and avoids the problem of component deviation of the high-entropy alloy coating caused by the dilution rate.

The invention discloses a high-temperature-resistant austenite heat-resistant casting alloy material and an application method thereof, and belongs to the technical field of austenite heat-resistant casting alloy materials. The alloy material comprises C, Si, Mn, Cr, Al, Nb, Ti, Zr, N, Mo, W, Y, Ni and Fe elements with specific mass percentage content. Wherein the mass percentage contents of the C, Cr, Al and Ti elements meet the condition that the value of f1 obtained by the calculation model 1 meets the condition that f1% is larger than or equal to 2%, and f1% represents the volume percentage content of an M23C6 precipitated phase of the alloy material at the application temperature of 1100 DEG C or above. The alloy material obtained by the invention has remarkable high-temperature creep resistance in an extreme high-temperature environment, has a stable and compact oxidation film and reinforced carbide, and can keep excellent structural stability and high-temperature mechanical properties under a long-term service condition.

The invention provides an aluminum alloy and a preparation method thereof, and the aluminum alloy comprises the following elements in percentage by mass: 0.30-0.50 wt.% of Si, 0.30-0.50 wt.% of Fe, 0.30-0.50 wt.% of Cu, 0.30-0.50 wt.% of Mn, 0.30-0.50 wt.% of Mg, 0.30-0.50 wt.% of Zn, 0.30 0.45 wt.% to 0.65 wt.% of Fe; 0.40 wt.% to 0.80 wt.% of Cu; mn: 1.25 wt.% to 1.35 wt.%; less than or equal to 0.05 wt% of Mg and less than or equal to 0.10 wt% of %, 0.02 wt.% to 0.05 wt.% of Ti; other single impurities: less than or equal to 0.05 wt.%; the total of other impurities is less than or equal to 0.15 wt.%; and Al: the balance. According to the aluminum alloy and the preparation method thereof, the content of high-strength elements in the aluminum alloy is increased, the content of Mn elements and the content of Fe elements are increased, meanwhile, the Si element is added and matched with the Fe element, the strength and hardness of the aluminum alloy can be effectively improved, and especially the remarkable effect is achieved after cold machining such as rolling; and meanwhile, it is guaranteed that the aluminum alloy has good ductility, the tensile strength of the aluminum alloy is larger than 150 MPa, the ductility of the aluminum alloy is lower than 17%, and the aluminum alloy has good mechanical performance.

The invention provides a 5G50 aluminum alloy plate strip for anodic oxidation and a preparation method of the 5G50 aluminum alloy plate strip. The 5G50 aluminum alloy plate strip for anodic oxidation comprises the following elements in percentage by mass: 0.01%-0.10% of Si element, 0.04%-0.15% of Fe element, 3.0%-4.0% of Mg element, 0.2%-1.2% of Mn element, less than or equal to 0.02% of inevitable impurity element in total content, less than 0.05 wt% of single impurity element and the balance of Al. Wherein after the aluminum alloy plate strip is subjected to anodic oxidation treatment, the surface of the aluminum material has no heterochromatic stripe defect, and the chromatic aberration E is less than 0.15. The 5G50 aluminum alloy plate strip for anodic oxidation can give consideration to both high surface quality and excellent mechanical performance, is widely applied to 3C consumer electronics, and can achieve the practical effects of falling resistance, light weight and attractive appearance of the product.

The invention provides a TiB2-Al-Ce-La-Fe alloy with high elongation and high thermal conductivity and a preparation method and application of the TiB2-Al-Ce-La-Fe alloy. According to the TiB2-Al-Ce-La-Fe alloy, the mass fraction of Ce is 4%-5%; the mass fraction of the Fe element is 0.3%-0.5%; the mass fraction of the element La is 1.2%-1.7%; the mass fraction of the TiB2 is 0.01%-0.1%. The preparation method of the TiB2-Al-Ce-La-Fe alloy comprises the following steps: smelting raw materials in a well type smelting resistance furnace, adding an Al-TiB2 intermediate alloy, and casting the obtained melt into a mold, so as to obtain the TiB2-Al-Ce-La-Fe alloy. The TiB2-Al-Ce-La-Fe alloy with the high elongation rate and the high thermal conductivity is good in thermal conductivity, and the thermal conductivity of the alloy ranges from 202.96 W / (m.K) to 209.27 W / (m.K); the mechanical property is excellent, and the ductility is 23.8-31%.

The present invention discloses a laser additive manufacturing titanium-steel multi-material component, its equipment and method for improving interface bonding and forming performance by suppressing element diffusion through an intermediate layer. The laser additive manufacturing titanium-steel multi-material component includes a titanium alloy layer, an intermediate layer, and a stainless steel layer. The intermediate layer includes a single-element metal Ce layer and a single-element metal Cr layer; the titanium alloy layer, the single-element metal Ce layer, the single-element metal Cr layer, and the stainless steel layer are all sequentially deposited by a laser directed energy deposition process. It can be seen that, for the intermediate layer of the present invention, by designing the single-element metal Ce layer and the single-element metal Cr layer, the diffusion of Ti element in the titanium alloy layer and Fe element in the stainless steel layer is blocked through the mutual solubility characteristics of Ce and Cr, and good metallurgical bonding between different materials is achieved, solving the problems such as interface cracking and holes caused by brittle intermetallic compounds when titanium alloy and stainless steel are directly connected.

The invention provides an anodic oxidation die-casting aluminum alloy and a preparation method thereof. The anodic oxidation die-casting aluminum alloy comprises the following elements of, by mass, 0.01%-1% of Mg element, 0.01%-2% of Zn element, 0.01%-2% of Si element, 0.01%-1% of Ni element, 0.2%-0.5% of Fe element, 1.6%-2.4% of Mn element, 0.1%-0.2% of Cu element, 0.02%-0.2% of Ti element, the total content of inevitable impurities smaller than or equal to 0.2%, and the balance Al element. Wherein the sum of the mass content of the Mg element and the mass content of the Zn element is 1-3%, the sum of the mass content of the Si element and the mass content of the Ni element is 0.1-2.5%, and the sum of the Fe element, the Si element and the Ni element is 0.1-3%. The aluminum alloy can be better used for producing thin-wall piece products with the thickness of 0.8-1.8 mm.

The invention discloses an iron-aluminum intermediate alloy and a preparation method thereof. The iron-aluminum intermediate alloy comprises the following components in percentage by weight: 39-40% of Al; 58 to 64 percent of Fe; 0.30% or less of Si; o: < = 0.15; n: less than or equal to 0.04; and C: less than or equal to 0.10. According to the method, the iron and the aluminum are prepared into the iron-aluminum intermediate alloy, so that the Fe element can be more uniformly added into the smelting of the titanium alloy, and the problem that the Fe element is easy to segregate during the smelting of the titanium alloy is solved.

The invention relates to a net-shaped heterostructure cast high-entropy alloy with good mechanical properties and preparation and application thereof, and aims to solve the technical problems of high production cost and long period caused by the dependence of introduction of high-cost elements or a complex process in the conventional high-entropy alloy. The CrFexNiAl0. 28Ti0. 12 as-cast high-entropy alloy is prepared by taking CrFeNiAl0. 28 as a matrix component, optimizing the alloy design by introducing a Ti element and adjusting the content of an Fe element and combining a vacuum arc melting and suction casting process. According to the method, Ti is reasonably added into the CrFeNiAl0.28 series alloy, the content of Fe is regulated and controlled to optimize the mechanical property of the CrFeNiAl0.28 series alloy, meanwhile, adverse effects caused by the Fe are overcome or balanced, and the net-shaped bionic heterostructure as-cast high-entropy alloy which is high in strength, good in plasticity and low in cost is developed.

The invention discloses hard alloy welding powder for valve sealing surface surfacing and a preparation method of the hard alloy welding powder. The welding powder comprises 1.20%-1.40% of C element, 2.70%-3.5% of Si element, 3.00%-4.50% of Mn element, 24.00%-26.00% of Cr element, 2.00%-2.20% of Mo element, 3.50%-4.50% of Ni element, smaller than or equal to 0.20% of Co element, smaller than or equal to 0.02% of B element, smaller than or equal to 0.10% of N element and the balance Fe element. The preparation method comprises the following steps: weighing raw materials, mixing and smelting the raw materials to obtain alloy liquid; and the alloy liquid is subjected to gas atomization to prepare powder, and the hard alloy welding powder is obtained after screening. The Co element content is strictly limited, and meanwhile the hardness and other performance can meet the design requirement; the preparation method is simple and reliable in process.

The invention relates to the field of titanium alloy materials, in particular to an inactive eutectoid element regulated alpha + beta type titanium alloy and a preparation method thereof. The titanium alloy comprises the following chemical components in percentage by mass: 5.0 to 7.0 percent of Al element, 2.0 to 4.0 percent of Nb element, 1.0 to 3.0 percent of Mo element, 1.0 to 3.0 percent of V element, 1.0 to 2.0 percent of Zr element, 0.5 to 3.0 percent of Fe element and the balance of Ti. The preparation process of the titanium alloy comprises the steps of electrode pressing, cast ingot preparation, high-temperature homogenization treatment, forging, rolling, solution treatment and aging treatment. The strength and toughness of the titanium alloy are adjusted by regulating and controlling the content of the non-active strong beta stable element Fe, the alpha + beta type high-strength and high-toughness titanium alloy with different strength levels is obtained, and the alpha + beta type high-strength and high-toughness titanium alloy can be widely applied to the important fields of aerospace, ocean engineering, weaponry, petrochemical engineering, automobile industry, biomedical treatment and the like.

The invention relates to a heat-treatment-free high-toughness Al-Si series cast aluminum alloy and a preparation method and application thereof, and belongs to the field of aluminum alloys. The heat-treatment-free high-toughness Al-Si series cast aluminum alloy comprises, by mass, 6%-9% of Si, 0.1%-0.5% of Mg, 0.001%-1.2% of Cu, 0.15%-0.5% of Fe, 0.001%-0.5% of Mn, 0.001%-0.5% of Mo, 0.015%-0.025% of Sr, 0.001%-0.05% of Ca and the balance Al and inevitable impurities, the sum of the mass fractions of the impurities is smaller than or equal to 0.2%, and the mass fraction of a single impurity element is smaller than or equal to 0.05%. According to the Al-Si series heat-treatment-free cast aluminum alloy prepared through the method, in the cast state, the yield strength ranges from 110 MPa to 140 MPa, the tensile strength ranges from 220 MPa to 265 MPa, and the elongation ranges from 7% to 14%. In addition, the preparation method is simple, the performance is excellent, the alloy is suitable for large integrated die-casting automobile structural parts, in addition, the tolerance of the alloy to the Fe element is high, secondary aluminum can be directly used for production, energy consumption is reduced, and the alloy is suitable for large-scale popularization.

The invention discloses a method for improving the elongation of a high-iron-content A356 alloy, which comprises the following steps of: firstly, obtaining or retrieving data of a thermodynamic database of an existing Al-Si-Mg-Fe system through an experiment; then, obtaining a thermodynamic equilibrium phase diagram by adopting a thermodynamic calculation method; and finally, determining a solidification path according to the thermodynamic equilibrium phase diagram, and determining the value range of the Fe element content. In the A356 alloy, the content of Fe is 0.5 wt.%, the content of Sr is 0.02 wt.%, and the cooling rate is 2 DEG C / s. The specific method comprises the following steps: 1, preparing an Al-7Si-0.3 Mg-0.5 Fe alloy melt; and 2, preparation of the Al-7Si-0.3 Mg-0.5 Fe-0.02 Sr alloy is carried out. The preparation method comprises the following In the obtained high-iron-content A356 alloy, the length of eutectic Si is 20.00 [mu] m, and the length of an Fe-rich phase is 55.70 [mu] m; and the ductility of the alloy is 6.02%.

The invention provides titanium alloy metal powder and a laser melting deposition additive manufacturing method for a structural part. According to the method, a + beta double-phase titanium alloy metal powder strengthened by elements such as oxygen and iron is firstly prepared, and then deposition forming of a large-size component is completed according to a laser melting deposition additive manufacturing process. According to the method, the technological characteristics that during laser additive manufacturing, the molten metal cooling speed is high, and the element segregation degree is low are utilized, the problem that during titanium alloy component system design, the content of oxygen, iron and other elements is too high, and consequently brittleness is sharply increased is solved, and the purpose that the element O serves as an alpha-phase stable element is achieved; and designing a component system by taking Fe element as a main beta-phase stable element. The prepared large-size titanium alloy component shows good strength and toughness, the tensile strength is larger than or equal to 930 Mpa, the yield strength is larger than or equal to 850 Mpa, the percentage elongation after fracture is larger than or equal to 10%, and the percentage reduction of area is larger than or equal to 20%.

The invention belongs to the technical field of non-ferrous metal smelting, and particularly relates to a method for separating Fe impurity elements in aluminum alloy waste. Testing the components of the aluminum alloy waste, and determining the Fe content; melting the waste materials and adjusting the components. Casting an alloy ingot, cutting a cylindrical test bar, heating and solidifying; in the directional solidification process, Fe and transition metal elements are segregated towards one end of the sample, and an Fe-containing intermetallic compound is formed. The segregation of Fe impurity elements is promoted by utilizing the distribution coefficient difference of Fe impurity elements and alpha-Al solute and combining zone melting with directional solidification. And after the Fe impurity element enrichment end alloy is cut off, the process is repeated again, and the Fe impurity element content in the alloy is gradually reduced through multiple times of treatment until the alloy with the ultralow Fe impurity element content is obtained. According to the method, segregation and separation of the Fe element are achieved by combining zone melting with the directional solidification technology, the alloy with the extremely low Fe element content is obtained through multiple times of circulation, and high-quality regeneration of the aluminum alloy waste is facilitated.

The invention discloses a high-Fe-content and high-comprehensive-performance aluminum alloy and a preparation method thereof.The specific method comprises the following steps that firstly, reasonable smelting and refining processes are adopted, three different modifiers are added to conduct Fe phase modification treatment on waste aluminum materials, and the existence form of the Fe element is controlled; and carrying out homogenization heat treatment and deformation heat treatment to obtain the high-temperature-resistant alloy. Through alloy component design and machining process optimization, the characteristics of morphology, distribution and the like of the Fe-rich phase are changed, phase change of the Fe-containing phase is achieved, the interface behavior of the Fe-containing phase is regulated and controlled, then accurate control over the microstructure of the high-Fe-content aluminum alloy is achieved, and high comprehensive performance is obtained. The high-Fe-content 6XXX series aluminum alloy prepared through the method has excellent mechanical performance and corrosion resistance, the application requirement of the high-quality 6XXX series aluminum alloy can be met, and a new way is provided for high-value utilization of secondary aluminum.

The invention belongs to the technical field of aluminum alloy die-casting, and particularly relates to a high-strength and high-toughness heat-treatment-free die-casting aluminum alloy, a structural part and a preparation method. According to the high-strength and high-toughness heat-treatment-free die-casting aluminum alloy provided by the invention, the limitation that a traditional heat-treatment-free die-casting aluminum alloy is low in Fe element tolerance and the limitation that a traditional high-Fe-content aluminum alloy is insufficient in toughness are broken through by designing an element composition system and multi-strategy cooperative regulation and control of the high-strength and high-toughness heat-treatment-free die-casting aluminum alloy. And by adopting a Ca-Sr composite modification strategy and a Cr-Mn cooperative regulation strategy, the Fe content tolerance is expanded to 0.5 wt%-1.6 wt%, and meanwhile, the recycling rate of waste materials of the die-casting aluminum alloy is high. Based on the synergistic strengthening effect of all elements in the components, the tensile strength and ductility of the high-Fe-content die-casting aluminum alloy can be synergistically improved without heat treatment, the heat-treatment-free die-casting aluminum alloy with high tensile strength and high toughness is obtained, and the heat-treatment-free die-casting aluminum alloy is suitable for preparing deep-cavity shell type, multi-fin heat dissipation type and other complex structural parts.

The invention relates to low-alloy structural steel, in particular to easy-to-bend 460MPa steel for a 20mm coal mine hydraulic support and a preparation method of the easy-to-bend 460MPa steel, and the steel is prepared from the following raw materials in percentage by mass: 0.16-0.18% of C, 0.20-0.30% of Si, 1.35-1.5% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020-0.025% of Nb and the balance of Fe and inevitable elements. According to the easy-to-bend 460MPa steel for the 20mm coal mine hydraulic support, only a small amount of Si, Mn, Al and Nb alloy is added in the component design, other precious alloy does not need to be added, heat treatment is controlled through a rolling process, the easy-to-bend steel for the 20mm 460MPa coal mine hydraulic support is manufactured, when D is equal to 1a, the easy-to-bend steel does not crack when being bent, and the tensile strength of the easy-to-bend 460MPa steel is higher than that of the 20mm 460MPa coal mine hydraulic support. And the performance of the low-alloy high-strength structural steel is superior to that of 20mm low-alloy high-strength structural steel specified by GB / T1591-2018 Low-alloy high-strength structural steel.

The invention discloses an iron-based / alpha-Fe amorphous nanocrystalline soft magnetic alloy, which is based on an iron-based amorphous strip mainly comprising Fe element, and contains Co element with atomic fraction of 6%-8%, Cu element with atomic fraction of 0.7%-1%, and the balance of trace elements which are at least one of oxygen, sulfur, phosphorus, carbon, silicon, boron and the like. And carrying out stress relief annealing on the strip with the assistance of a magnetic field, and then carrying out crystallization treatment. Different from a traditional method for regulating and controlling the magnetic performance of the alloy through precipitation of a large number of nanocrystals, the alloy only induces precipitation of a very small number of nanocrystals, and high saturation flux density and low coercive force can be obtained while the toughness of the strip is ensured.

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.