121 results about "Mn alloy" patented technology

The invention relates to a preparation method of beryllium-copper alloy. The preparation method comprises the following steps: (S1) accurately weighing the following raw materials by mass: copper, beryllium, copper-yttrium alloy, copper-titanium alloy, copper-manganese alloy and nano ytterbium powder; (S2) the raw materials are added into a vacuum induction furnace, the temperature is increased to 1400-1600 DEG C under the inert atmosphere, after the raw materials are completely molten, a covering agent is spread on the melt, smelting, standing and slagging-off are conducted under the stirring condition, the melt is poured into a mold under the condition of 1100-1200 DEG C, and a beryllium copper alloy ingot is obtained; and (S3) the beryllium-copper alloy ingot is subjected to face milling treatment, solution treatment, cold machining deformation treatment and aging treatment in sequence, and the product beryllium-copper alloy is obtained. A small amount of metal elements are added, aging treatment is carried out under the microwave condition, and then slow cooling is carried out at the constant cooling rate, so that the overaging phenomenon can be remarkably inhibited, the hardness of the alloy is improved, and meanwhile, the mechanical property, especially the stress relaxation resistance, is also improved.

The invention discloses a low-cost, flame-retardant, high-strength, high-thermal-conductivity and corrosion-resistant Mg-Al-Ca-Mn alloy and a preparation method thereof, relates to an Mg-Al-Ca-Mn alloy and a preparation method thereof, and aims to solve the problem that an existing magnesium alloy is difficult to meet the requirements of high plasticity, corrosion resistance, thermal conductivity and flame resistance at the same time. The invention provides a low-cost, high-strength, corrosion-resistant, heat-conducting and flame-retardant Mg-Al-Ca-Mn-X alloy, X is one or a combination of more of Y, Gd, La, Ce, Sm and Nd according to any ratio, the microstructure of the alloy is regulated and controlled through alloy component optimization, rare earth microalloying, a heat treatment process and a plastic deformation process, and the mechanical property of the alloy is improved. The alloy prepared by the invention has excellent mechanical property, corrosion resistance, heat-conducting property and flame retardant property. The method is applied to the field of metal materials.

The invention relates to the technical field of metallurgy and chemical industry, in particular to a silicon-manganese alloy smelting method which comprises the following steps of raw material pretreatment, gradient reduction smelting, tapping and refining and flue gas slag cooperative treatment. In the silicon-manganese alloy smelting process, lanthanum-cerium oxide in the rare earth composite material reacts with impurities such as sulfur, phosphorus and oxygen in a melt at high temperature to form a high-melting-point compound which is separated along with slag, the impurity content is effectively reduced, meanwhile, rare earth elements are segregated at the grain boundary, atomic diffusion migration is inhibited, the alloy grain size is remarkably refined, and the alloy yield is improved. And the rare earth composite material optimizes the alloy solidification structure through the double effects of chemical purification and physical modification, the problems of impurity segregation and insufficient toughness in the traditional silicon-manganese alloy smelting process are solved, and the mechanical property of the silicon-manganese alloy is remarkably improved.

The invention discloses a cold-crack-resistant welding wire for thick-specification ultrahigh-strength steel and a welding method of the cold-crack-resistant welding wire, and belongs to the technical field of welding, a low-cost alloy system with Mn as a leading part and Cr as an auxiliary part is constructed, Mn is used for reducing the Ms point, the hardenability of Cr is improved, and the Ms point of weld metal is regulated and controlled to be in a low-temperature phase change interval of 100-150 DEG C; in the welding process, the inter-pass temperature is controlled to be higher than the Ms point all the time, all layers of welding beads are kept in the austenite state in the filling process, all the welding beads are uniformly cooled, low-temperature martensite phase transformation is synchronously generated, the situation that phase transformation of the welding beads which are firstly welded too early occurs, and consequently pressure stress relaxation is caused is avoided, and part of retained austenite is reserved is avoided. By means of the characteristics of a medium Mn alloy system, the common cold crack risk in thick plate high-restraint welding is effectively avoided, it is ensured that weld metal has the ultrahigh strength, meanwhile, the alloy cost is remarkably reduced, and therefore the technical bottleneck of thick ultrahigh-strength steel in the low-cost and efficient welding application aspect is broken through.

This invention belongs to the field of aluminum alloy sheet design and processing, specifically relating to a high-strength, corrosion-resistant Al-Mg-Mn alloy sheet and its short-process processing method. The short-process processing method for this high-strength, corrosion-resistant Al-Mg-Mn alloy sheet combines short-process processing with micro-alloying, and employs continuous casting and rolling combined with two annealing processes. This shortens the processing flow, saves energy and costs, and comprehensively improves the mechanical strength, plasticity, and corrosion resistance of the short-processed Al-Mg-Mn alloy sheet through the synergistic effect of micro-alloying, three-pass continuous cooling rolling, and two annealing processes. The resulting alloy sheet is highly suitable for high-performance special vehicle and marine structural components.

The present invention provides an aluminum alloy for automobile pistons and a preparation method thereof, the preparation method being as follows: using aluminum ingots and crystalline silicon as raw materials to make a binary master alloy; adding magnesium ingots, Al-Cu alloy ingots and Al-Mn alloy ingots to perform a multi-element alloying process; refining the alloy material after melting and standing; adding enhanced-modified particles to stir and keep warm; refining for a second time, while starting a pulse device to apply a pulse current to the alloy melt to keep warm; cooling to 800°C and pouring into a mold; after the sample solidifies and cools, heat treatment is performed using a T6 heat treatment process. The present invention uses enhanced-modified particles to simultaneously possess mechanical enhancement and modification effects. Simply using nano-titanium boride will result in uneven distribution in the aluminum alloy, and nano-scale particles are prone to agglomeration, thereby affecting its effect. Particles prepared by electrostatic spinning can prevent the agglomeration of particles while loading the P element. In addition, enhanced-modified particles can also improve the plasticity of the aluminum alloy, an effect that cannot be achieved by simple nanoparticles.

The invention discloses a high-performance Al-Mn alloy composite material and a preparation method thereof, and belongs to the technical field of metal material preparation. The material is of a surface layer-core part-surface layer continuous gradient structure, and the surface layer is prepared from 3.5% of Mn, 0.5%-1.0% of Cu, 0.8%-1.0% of Mg, 0.3%-0.8% of Zn, 0.2%-0.3% of Sc, 0.1%-0.2% of Cr, 0.4%-0.6% of TiO2 reinforcement and the balance Al and impurities; and the core part comprises the following components: 0.1 to 0.2 percent of Zr, 0.05 to 0.1 percent of Si, 0.4 to 0.6 percent of Al2O3 reinforcement and the balance of Al and impurities. The preparation method comprises the steps of mechanical powder mixing, gradient cold press molding, hot isostatic pressing densification, homogenization treatment, hot extrusion, annealing treatment and solid solution-two-stage aging treatment. Through gradient component design and a multi-process synergistic process, the strength, toughness and corrosion resistance of the material are synergistically improved, and the material is particularly suitable for power battery shells and other high-performance light-weight structural parts.

This invention relates to the field of alloy technology improvement and provides a method for preparing aluminum-magnesium alloy welding wire, comprising: S1, adding a mixture of metallic magnesium, aluminum, aluminum-manganese alloy, and aluminum-chromium alloy to a melting furnace for heating and melting; S2, subjecting the molten mixture to grain refinement and refining treatment in the melting furnace; S3, casting and rolling the refined aluminum alloy melt to obtain an aluminum alloy wire rod; S4, subjecting the aluminum alloy wire rod to scraping, precision drawing, and precision scraping to generate an aluminum alloy welding wire that meets the required parameter standards. The aluminum alloy welding wire prepared by this method shortens the workshop production line, simplifies production equipment, reduces the cost of preparing aluminum alloy welding wire, improves production efficiency, reduces raw material consumption, and simultaneously possesses high mechanical properties, making it highly practical.

The application relates to the field of damping alloy, and particularly discloses an iron-manganese damping alloy with high damping performance at low strain amplitude and a preparation method thereof. The preparation method comprises the following steps: establishing an iron-manganese alloy lattice structure model by using a three-dimensional modeling software; performing slice processing on the iron-manganese alloy lattice structure model; taking iron-manganese powder as a matrix material, and preparing an iron-manganese alloy lattice structure by using a selective laser melting additive manufacturing process; and performing heat treatment on the iron-manganese alloy lattice structure, wherein the heat treatment comprises solid solution treatment and aging treatment performed in sequence. By means of the additive manufacturing and heat treatment processes, the iron-manganese damping alloy with high strength and damping performance is prepared, and the alternating strain is amplified through the lattice structure, so that the iron-manganese damping alloy also has excellent damping performance at low strain amplitude. The damping performance tan phi of the iron-manganese alloy at a strain amplitude of 2*10 ‑4 -4 can reach 0.047, which helps to expand the application prospect of the iron-manganese alloy in the micro-vibration sensitive field.

An alloy anode for a seawater based aqueous battery and a universal strategy for preparing anodes for use in seawater based aqueous batteries. Zn-M alloys (where M can be manganese or other transition metal) were prepared by co-electrodeposition in the presence of hydrogen bubble formation to produce a porous nanostructured alloy that can serve as an anode for a seawater based aqueous battery. Exemplary Zn—Mn alloy anodes achieved stability over thousands of cycles even under harsh electrochemical conditions, including testing in seawater-based aqueous electrolytes and using a high current density of 80 mA cm−2. The anode design strategy allows for the production of durable electrodes for aqueous batteries and other applications.

A method for preparing a large-sized copper-iron alloy ingot is provided, which adopts continuous or semi-continuous casting, and adopts the following treatments during the casting process: (1) component alloying: adding an alloying modifier to the copper-iron alloy melt, the alloying modifier is composed of a mixture of copper-calcium alloy, copper-aluminum alloy, copper-manganese alloy and copper-cobalt alloy, and the composition weight percentage of the alloyed ingot obtained after adding the alloying modifier is as follows: 0.002~0.01wt.% calcium, 0.02~0.12wt.% aluminum, 0.05~1.0 wt.% manganese, 0.01-0.2wt.% cobalt, 15-80wt.% iron, and the balance copper; (2) adding a nucleating agent: continuously adding a rare earth nucleating agent to the molten pool during the casting process, wherein the rare earth nucleating agent is composed of a mixture of a copper-cerium alloy and a copper-scandium alloy, and the mass percentage of the rare earth nucleating agent is: 6-13wt.% cerium, 10-35wt.% scandium, and the balance copper; (3) strong magnetic field suppression: applying a strong magnetic field around the crystallizer, including a constant magnetic field and a pulsed magnetic field. The present invention can effectively improve the uniformity of the distribution of iron elements and iron-rich phases in large-sized ingots through the above-mentioned treatment measures.

The present invention provides a method and device for preparing silicon nitride manganese alloy, wherein high-purity nitrogen is continuously introduced into a vertical furnace, and the oxygen in the vertical furnace is completely replaced by nitrogen, and the pressure of the nitrogen in the vertical furnace is maintained to be greater than the atmospheric pressure; according to the target smelting silicon nitride manganese alloy component requirements, electrolytic manganese, silicon manganese alloy, and high silicon ferrosilicon are mixed according to the calculated component ratio and then put into the vertical furnace; the mixed material in the vertical furnace is ignited by electric arc ignition, and when the temperature of the reaction zone in the furnace reaches 850°C to 1200°C, a nitriding reaction is performed to obtain silicon nitride manganese alloy powder, and the prepared silicon nitride manganese alloy powder is discharged from the bottom of the vertical furnace body by sedimentation; after the above steps are completed, a self-propagating reaction is performed to obtain silicon nitride manganese alloy. The present application enables the nitrogen content of the generated silicon nitride manganese alloy to be stabilized at a relatively high state.

The application discloses a kind of high-damping Fe-Mn series alloy materials, the component of alloy and the mass fraction of each component are as follows: Mn 16.5-17.5%, doping metal 0.5-0.8%, TiB2 0.02-0.03%, C0.01-0.015%, Si 0.015-0.02%, Fe remainder.The high-damping Fe-Mn series alloy material provided by the application, by optimizing the composition of alloy material and improving the process, using the method of combination of forging, stage solid solution and stage aging, the Fe-Mn series alloy material prepared has the comprehensive performance of high damping, high strength and good toughness;Add specific ratio of Ni, Zr, Mo doping metal and a small amount of TiB2, wherein, Ni improves the stacking fault energy, stabilizes austenite and solid solution strengthening, Zr and Mo form intermetallic compound to carry out precipitation strengthening and refine grain, TiB2 promotes grain refinement, C and Si affect the strength, plasticity and processing performance of alloy, synergistic effect of each element, the balance of high damping, high strength and good low-temperature toughness of Fe-Mn series alloy is realized.

The invention relates to a method for preparing a copper-aluminum-manganese composite material, in particular to a method for preparing an aluminum oxide particle reinforced copper-aluminum-manganese composite material through combination of laser powder bed melting and in-situ reaction. The invention aims to solve the problem of insufficient hyperelasticity of the existing copper-aluminum-manganese alloy and the problem that a fine-crystalline pure austenite structure cannot be prepared in the sintering preparation process of the traditional aluminum oxide reinforced copper alloy. The method comprises the following steps: 1, preparing CuAlMn and Cu2O composite powder; 2, carrying out vacuum sealing and in-situ reaction at high temperature; and 3, laser printing forming. The method is used for preparing the aluminum oxide particle reinforced copper-aluminum-manganese composite material through combination of laser powder bed melting and in-situ reaction.

The invention discloses a process for improving toughness of exported American standard SS steel rails, and belongs to the technical field of metallurgical materials. The production technology comprises the steps of smelting, rolling, cooling bed cooling and machining. According to the steel rail rolling process, the heating time is 2.5-3.0 hours, the initial rolling temperature is larger than or equal to 1030 DEG C, and the final rolling temperature is 870-930 DEG C; and the steel rail cooling bed cooling process comprises the steps that the steel rail interval is larger than or equal to 550 mm, the steel rails are naturally cooled, the initial cooling temperature ranges from 840 DEG C to 880 DEG C, after the steel rails are cooled to the temperature smaller than or equal to 60 DEG C, the steel rails are straightened, and after straightening, machining, preparing and sampling are conducted for mechanical property inspection. By reasonably designing the components and adding optimal Si and Mn alloy elements into the steel rail, the steel rail produced by the production process has the advantages of high cleanliness, high toughness, unique production process, high production efficiency, energy conservation, environment friendliness, high economic benefit, suitability for large-scale production and wide application prospect, and the strength, the elongation, the tread hardness and other properties of the steel rail produced by the production process meet the standards. Good popularization values are realized.

The invention relates to the technical field of spacers, and particularly discloses a high-toughness aluminum alloy and a preparation method and application thereof. The high-toughness aluminum alloy provided by the invention is composed of Si, Mn, Mg, Zr, Sr, Er, Fe, nano # imgabs 0 # and aluminum according to a specific proportion, pure aluminum, Al-Si alloy, Al-Mn alloy, Al-Zr alloy, Al-Er alloy, # imgabs 1 # alloy and Al-Sr alloy according to a specific proportion are molten in batches, then refining treatment is performed, and finally the high-toughness aluminum alloy is obtained. The prepared high-toughness aluminum alloy has high compressive strength and good flexibility, and can adapt to an existing vacuum die-casting process; in addition, the invention further provides a spacer frame prepared from the high-toughness aluminum alloy and a die-casting die, and the spacer frame also has excellent compressive strength and flexibility. Therefore, the prepared high-toughness aluminum alloy and the spacer frame are better in strength and flexibility, the actual application requirements can be better met, and the problems that an existing die-casting alloy is low in strength and poor in toughness are solved.

Provided is an Fe-Mn alloy having a low magnetic susceptibility and excellent workability. The Fe-Mn alloy includes, by mass, more than 30.0% but not more than 35.0% manganese (Mn), 1.0% to 8.0% aluminum (Al), 0.5% to 1.5% carbon (C), 5.0% to 10.0% chromium (Cr), and 2.5% to 5.0% nickel (Ni) in terms of composition, the remainder being iron (Fe). As a crystal structure, the Fe-Mn alloy has a γ-Fe phase or a β-Mn phase, and the sum of the area fractions of the γ-Fe and β-Mn phases is 50% or more.

The invention relates to the technical field of aluminum alloy heat treatment, in particular to a homogenizing heat treatment process and system for an aluminum alloy battery shell for a new energy automobile. The process comprises the following steps: obtaining an Al-Mn alloy cast-rolled coiled material, and carrying out acid pickling treatment on the Al-Mn alloy cast-rolled coiled material; the Al-Mn alloy cast-rolled coiled material is cleaned; the Al-Mn alloy cast-rolled coiled material is placed in a high-temperature annealing furnace to be subjected to homogenizing heat treatment, and the temperature in the furnace is monitored in real time; after the annealing furnace is cooled, sampling is conducted on the Al-Mn alloy cast-rolled coiled material, and performance detection is conducted on a sample; the system comprises a pretreatment module, a cleaning module, a heat treatment module and a detection and evaluation module. Through homogenizing annealing treatment, composition segregation generated in the casting and rolling process of the Al-Mn alloy cast-rolled coiled material can be effectively eliminated, so that the structure is more uniform and fine, the deep drawability and mechanical property of the material are stable, the defects of cracking and wrinkling are avoided, and the quality and reliability of the battery shell are improved.

This disclosure relates to a semiconductor device and a method for manufacturing the same. The semiconductor device includes: an interlayer insulating film disposed on a substrate and having a recessed portion of the substrate exposed; a bottom electrode contact embedded in at least a portion of the recessed portion; a magnetic tunnel junction (MTJ) layer disposed on the interlayer insulating film and the bottom electrode contact; and a offset cancellation layer with a magnetization direction parallel to the antiparallel side of a fixed layer, wherein the offset cancellation layer may include a Co alloy, Fe alloy, Ni alloy, or Mn alloy comprising at least one selected from the group consisting of Al, Ga, B, Ir, Zr, Hf, and rare earth metals, or a ternary or quaternary Co alloy, Fe alloy, or Ni alloy comprising one selected from the group consisting of Pt or Pd and at least one selected from the group consisting of Cr, Al, Tb, Si, and B.

This invention belongs to the field of aluminum-based composite material preparation technology, specifically a high-strength and high-toughness aluminum-based composite material based on additive manufacturing technology and its preparation method. The composite material of this invention comprises a matrix material and a reinforcing phase. The matrix material is Al-0.1%Mg-0.6%Si-1.0%Cu-0.5%Mn alloy powder, and the reinforcing phase consists of ZnO powder and pure Cu powder. This invention uses an Al-0.1Mg-0.6Si-1.0Cu-0.5Mn alloy as the matrix and ZnO and Cu particles as the reinforcing phase, utilizing selective laser remelting (SLM) technology to form a novel, high-strength and high-toughness aluminum-based composite material. During the printing process, by performing two laser scans on each layer of metal powder, metallurgical bonding between the reinforcing particles and the matrix is ​​achieved, while simultaneously reducing the material's porosity, refining the grain structure, and significantly improving its mechanical properties.

The invention discloses a nano-porous Mn alloy / MnO2 anode with a core-shell structure and a preparation method and application thereof, and relates to the technical field of new materials.The preparation method comprises the steps that manganese powder serves as a main material, an auxiliary material I, an auxiliary material II and a pore forming agent are added, and uniform mixing is conducted to obtain a mixture; pressing into a blank; sintering the sample blank; and performing post-oxidation treatment in an air or oxygen atmosphere to obtain the catalyst. The auxiliary material I comprises at least one of Re, Co, Fe, Ni, Ag, Ce, La and Nd; the auxiliary material II comprises at least one of Ti, Ta, Ca, Sr, K, Na, Y, Eu and Dy; the pore-forming agent comprises at least one of magnesium powder, aluminum powder, stearic acid and urea. The nano-porous Mn alloy / MnO2 anode material has the beneficial effects that the nano-porous Mn alloy / MnO2 anode material with a three-dimensional open-pore structure, high permeability, high strength, large specific surface area and excellent conductivity is obtained by adding synergistic catalytic and synergistic stable elements and combining a specific preparation process.

The invention belongs to the technical field of magnesium alloy surface treatment, and discloses a pretreatment environment-friendly magnesium alloy high-corrosion-resistance coating preparation method which comprises the following steps: step 1, magnesium alloy zinc immersion; step 1.1, preparing a base material: polishing the base material; step 1.2, acid pickling; step 1.3, activation: adopting a mixed solution of ammonium bifluoride and phosphoric acid at room temperature, and forming a layer of protective film on the surface while removing an oxide layer; 1.4, zinc immersion is conducted, specifically, a zinc layer is deposited on the surface of the magnesium alloy through a replacement reaction; step 2, preparing an ionic liquid; step 2.1, preparation of an additive-free ionic liquid; 2.2, preparing an ionic liquid for electroplating an aluminum-manganese alloy coating; and step 3, post-treatment. Citric acid pickling and ammonium bifluoride-phosphoric acid activation liquid are adopted for pretreatment, and toxic chemicals are avoided; alCl-EMIC ionic liquid is used as a base, MnCl is added, an amorphous aluminum-manganese alloy coating is electroplated at the room temperature, and the corrosion resistance is remarkably improved.

The method comprises the steps of converter smelting, alloying, micro-aluminum modification and continuous casting, and specifically comprises the following steps that (1) converter smelting is conducted, and the carbon content and the oxygen content of tapping are controlled; (2) in the converter tapping process, silicon-manganese alloy is added for alloying treatment; (3) according to the oxygen content at the tapping end point, a micro-aluminum modifier is added to the surface of slag above the molten steel, and micro-aluminum modification is carried out; (4) weak argon blowing in an argon station; 5) continuous casting; and casting steel at a constant pulling speed. After converter tapping alloying, the micro-aluminum content modifier is added to the surface of the slag according to the tapping oxygen content, weak argon blowing in an argon station is combined, the steel-slag oxidability is effectively reduced, the oxygen content in the steel is reduced to 15 ppm or below, FeO in the slag is reduced to 1.5% or below, the aluminum content in the steel can be effectively controlled, stopper corrosion can be effectively relieved, and the service life of the converter is prolonged. And on the basis of ensuring the purity of the molten steel, the number of continuous casting furnaces of the deformed steel bar single tundish is obviously increased.

The utility model discloses a novel toothed roll crusher, including first toothed roll and second toothed roll, the center distance between first toothed roll and second toothed roll is greater than the sum of the radius of first toothed roll and second toothed roll, and less than the sum of the radius of first toothed roll, the radius of second toothed roll and half finished product maximum particle size size, thereby reduce the time and times of extrusion of material in the cavity formed between first toothed roll or second toothed roll, realize the purpose of reducing powder particle, after the technical improvement of above -mentioned structure, the powder particle rate of the silicon manganese alloy of crushing is close to artificial crushing, and the total crushing cost of every ton is less than artificial crushing 10 yuan or so, can replace artificial crushing completely, and can produce 200 million economic benefits for enterprise every 200 million tons output, has good popularization effect.

The utility model provides a dust removal and purification system for producing silicon-manganese alloy. The dust removal and purification system for producing the silicon-manganese alloy comprises a box body and a filter box fixedly mounted on one side of the box body, the inclined plate is fixedly arranged in the box body and is used for guiding smoke dust; the upper half part of an inner cavity of the box body is separated by the inclined plate to form a snake-shaped cavity; the group of drainage pipes are respectively arranged on the top of the inner wall of the box body and the inclined plate and are used for capturing dust particles in the smoke dust; the partition plate is fixedly mounted in the filter box and is used for partitioning the interior of the filter box into two filter cavities; the two groups of filter screens are respectively arranged in the two filter cavities in a sliding manner and are used for filtering dust; the two air inlets are formed in one side of the box body and are respectively communicated with the two filtering cavities. The dust removal and purification system for producing the silicon-manganese alloy has the advantage that the used filter screen can be taken out for cleaning operation under the condition that the box body is not stopped.

The invention relates to low-cost 460MPa-grade normalized pressure vessel steel and a preparation method thereof, belongs to the technical field of energy storage equipment, and solves the problems of low strength, high cost and complex preparation process of the existing pressure vessel steel. The pressure vessel steel comprises the following chemical components in percentage by weight: 0.12 to 0.18 percent of C, 1.2 to 1.7 percent of Mn, 0.2 to 0.4 percent of Si, 0.03 to 0.12 percent of V, 0.01 to 0.03 percent of N, 0.02 to 0.06 percent of Ti, less than or equal to 0.001 percent of Als, less than or equal to 0.002 percent of S, less than or equal to 0.01 percent of P and the balance of Fe. Compared with the prior art, the pressure vessel steel does not contain the element Ni, part of the element V is replaced with the element Ti, and the raw material cost is reduced; the content ratio of Ti to N is controlled to be lower than 3.42, so that a nanoscale Ti (C, N) strengthening phase is separated out in the preparation process of the steel; the Si-Mn alloy deoxidizer is used, so that the introduction of Al is reduced, and the precipitation of AlN is inhibited to enhance the plasticity and toughness of the steel; nitrided ferrovanadium is used for replacing ferrovanadium to directly introduce an N element, so that the technological process is reduced, and the cost is saved.

The invention discloses a high-speed extrudable magnesium alloy and a preparation method thereof, and relates to the technical field of magnesium alloy materials, the high-speed extrudable magnesium alloy comprises the following magnesium alloy components in percentage by weight: 0.8-1.2% of Ca, 0.4-0.8% of Mn and the balance of Mg and inevitable impurities, the content of impurity elements is less than or equal to 0.1%, and the preparation method comprises the following steps: step 1, preparing raw materials; step 2, alloy smelting and casting molding; step 3, alloy blank homogenization treatment; according to the high-speed extrusion magnesium alloy and the preparation method thereof, the defects that in the prior art, the magnesium alloy is low in extrusion speed, insufficient in yield strength or too high in cost are overcome, the magnesium alloy capable of being extruded at the high speed and the preparation method of the magnesium alloy are provided, by precisely regulating and controlling the component range and preparation process parameters of the Mg-Ca-Mn alloy, the alloy can be extruded at the high speed of 60 m / min, and the yield strength of the alloy is greatly improved. The yield strength reaches 200 MPa or above, meanwhile, good plasticity and formability are considered, expensive elements such as rare earth do not need to be added, the material cost is reduced, and the requirement for industrial large-scale production is met.

We provide highly aesthetically pleasing spandrels, spandrel panels, and buildings. [Solution] The spandrel comprises a metal substrate containing an Al-Mn alloy and a design layer laminated on the metal substrate, with the thickness of the metal substrate being 0.3 mm or more and 2.0 mm or less.

The application discloses a method for producing low-oxygen-content molten steel by adopting an EF+LFV process, wherein 20-30% of weight of slagging materials of smelting raw materials is added with carbon-increasing materials, so that the carbon content of the smelting raw materials reaches 1.20-1.50% of the weight of the smelting raw materials, the oxidation end point temperature is controlled to be greater than or equal to 1630 DEG C, and the carbon content at the oxidation end point is not less than the lower limit of the carbon content required by the smelted steel minus 0.05%; Si-Mn alloy, Si-Fe alloy and carbon-increasing agent are sequentially added into a refining ladle when tapping; and the molten steel is slagged and wire-feeding deoxidized during the refining period; and the molten steel produced by adopting the method has an oxygen content of less than or equal to 20 ppm, so that the purity of the molten steel is ensured to be high, and the production requirements are met.

A ribbon of elastocaloric material is provided. The ribbon is made from copper alloyed with aluminum and manganese. The ribbon has a length, a width, and a thickness. The length is a longest dimension of the ribbon, and the width is perpendicular to the length. The thickness is perpendicular to both the length and the width, and the thickness is 0.1 mm or less. Further, in a room temperature ambient environment, the ribbon increases in temperature by at least 4° C. upon application of 6% of tensile strain and cools by at least 4° C. when the tensile strain is unloaded.