116 results about "Mn element" patented technology

The invention provides a high-dielectric low-loss X7P type dielectric ceramic material and a preparation method and application thereof, and relates to the technical field of functional ceramic materials, the dielectric ceramic material is composed of a perovskite type compound as a main component and an auxiliary component; wherein the perovskite type compound contains a Ba element and a Ti element, and the auxiliary components comprise a first auxiliary component containing an Mg element, a second auxiliary component containing SiO2, a third auxiliary component containing an Mn element and a fourth auxiliary component containing a rare earth element R. According to the invention, barium titanate is doped and modified, so that the excellent performance of combining different compounds is realized, the dielectric constant and temperature stability of the dielectric ceramic material are improved, and the dielectric loss is reduced.

The invention provides a high-dielectric low-loss ceramic composition as well as a preparation method and application thereof, and relates to the technical field of functional ceramic materials, the high-dielectric low-loss ceramic composition comprises a perovskite type compound serving as a main component and an auxiliary component; wherein the perovskite type compound contains a Ba element and a Ti element, and the auxiliary components comprise a first auxiliary component containing an Mg element, a second auxiliary component containing an Nb element, a third auxiliary component containing an Mn element, a fourth auxiliary component containing a rare earth element R, and a fifth auxiliary component containing SiO2. According to the present invention, the ratio of the main components to the auxiliary components is subjected to design optimization, the ratio of the Nb element in the second auxiliary component to the Mn element in the third auxiliary component is adjusted, and the material preparation process parameters are subjected to optimization control, such that the dielectric constant and the temperature stability of the dielectric ceramic material are improved, and the dielectric loss is reduced.

The present invention discloses a preparation method of cold-rolled medium manganese QP steel based on Mn inhomogenization regulation, belonging to the field of preparation of medium manganese QP steel. The method comprises the following steps: increasing the Mn content of traditional QP steel to obtain an experimental steel; performing smelting, forging and rolling on the experimental steel to obtain a cold-rolled plate; pre-treating the cold-rolled plate to obtain initial lath martensite; sequentially performing critical region annealing treatment and rapid austenitization treatment on the steel plate containing the initial lath martensite to obtain a steel plate with non-uniform distribution of Mn element; and performing quenching and partitioning treatment on the steel plate with non-uniform distribution of Mn element to form a medium manganese QP steel with a core-shell structure.

The invention belongs to the technical field of low-carbon dehydrogenation aids, and particularly relates to a heat balance aid as well as a preparation method and application thereof. The heat balance auxiliary agent comprises Al, Ca, Si, Cu and Mn elements existing in an oxide form; wherein the Al2O3, the CaO and the SiO2 jointly form a skeleton structure of the auxiliary agent, and the CuO and the MnO2 are used as active components and are attached to the skeleton structure; the molar ratio of metal elements in the heat balance auxiliary agent is as follows: Al: Ca: Si: Cu: Mn = (49-78.9): (15-25): (1-10): (5-15): (0.1-1). The heat balance additive prepared by the invention shows excellent anti-sintering capability, long service life and stable heat supply performance under harsh reaction conditions such as propane dehydrogenation, and can effectively improve the selectivity of target olefin and reduce the generation of byproducts such as methane.

The present invention relates to a high-strength and high-plastic quenching-partitioning steel based on Mn chemical inhomogeneity and a preparation method thereof, which belongs to the field of third-generation advanced high-strength steel; its chemical composition mass percentage is: C: 0.2-0.4%, Mn: 2-5%, Si: 1-3%, P: ≤ 0.005%, S: ≤ 0.005%, and the balance is Fe and unavoidable impurities. By optimizing process parameters such as critical annealing temperature and time, it is ensured that a reasonable volume fraction of poor / rich Mn zone and Mn content are obtained; and by utilizing rapid heating and extremely short austenitization and heat preservation, the diffusion of Mn element is suppressed, the uneven distribution of Mn is retained, and a high-temperature austenite consisting of polygonal Mn-poor austenite and polygonal Mn-rich austenite is formed. Due to the uneven distribution of Mn elements, the martensitic phase transformation temperature range is increased, and martensitic lath refinement is achieved using a lower quenching temperature. The present invention achieves martensitic lath refinement while retaining more residual austenite, and the yield strength of the material is significantly improved.

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 discloses a 7-series aluminum alloy material and a preparation method thereof, and belongs to the field of aluminum alloy preparation.The 7-series aluminum alloy material and the preparation method thereof have the advantages that on the basis of optimizing components of 7-series aluminum alloy, the proportion and the process of the components are properly adjusted, it can be guaranteed that the tensile strength, the yield strength and the ductility meet the use requirements on the whole, and the corrosion resistance can be further improved; by adding the Zn element and the Mg element, the strength and hardness of the 7-series aluminum alloy can be remarkably improved, a proper Cu or Cr ratio can reduce residual phases (a T-Al2Mg3Zn3 phase, an AlZnMgCu phase or an AlZnMgCr phase), but after solution treatment, the residual phases gradually disappear, all alloy elements can be dissolved in a matrix in a solid mode, an AlFe phase is reduced, then corrosion sites are reduced, and by combining the synergistic effect of the Mn element and the V-containing refiner, the corrosion resistance of the 7-series aluminum alloy is improved. The crystalline phase in the 7-series aluminum alloy is refined, so that the mechanical property of the 7-series aluminum alloy can be obviously improved, and the corrosion resistance of the 7-series aluminum alloy can be obviously improved.

The application discloses high-temperature piezoelectric ceramics for high-power scenes and a preparation method thereof, and belongs to the technical field of piezoelectric ceramics. The high-temperature piezoelectric ceramic is Mn-doped lead zirconate titanate-based piezoelectric ceramic; the lead zirconate titanate-based piezoelectric ceramic is a three-phase solid solution of Pb(Yb 1 / 2 Nb 1 / 2 )O3, PbZrO3 and PbTiO3; and the doping mode of the Mn element is metal oxide MnO2 doping or composite oxide Pb(Mn 1 / 3 Nb 2 / 3 )O3 doping. The application solves the process problems existing in material industrialization by controlling the composition of the material, overcomes the problem that high piezoelectric performance and high Curie temperature and high mechanical quality factor are difficult to be compatible, and obtains high-power high-temperature piezoelectric ceramics with excellent comprehensive performance.

The invention discloses a low-cost, high-strength and low-yield-ratio wire rod for a rivet nut and a preparation method of the wire rod, and belongs to the field of metallurgical production of wire rods. The wire rod comprises the following chemical components in percentage by weight: 0.19 to 0.23 percent of C, 0.35 to 0.55 percent of Si, 1.30 to 1.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.25 to 0.35 percent of Cr, 0.002 to 0.020 percent of Al and the balance of Fe and inevitable impurities. The preparation method comprises the steps of smelting and casting, cogging, wire rod controlled rolling, cooling and the like, and the grain size of a wire rod is controlled to be 5-6 levels by optimizing component design (solution strengthening is mainly conducted on low-cost Si and Mn elements) and technological parameters (high-temperature heating, precise controlled rolling and controlled cooling, low-Al design and the like); the tensile strength of the rivet nut manufactured through follow-up modification, cold heading and annealing treatment reaches 530-610 MPa, the yield strength ranges from 320 MPa to 360 MPa, the yield ratio is smaller than or equal to 0.6, the 10.9-level requirement is met after riveting hardening, the production cost is remarkably reduced, and the problems that an existing high-level rivet nut depends on precious metal, the yield ratio is high, and cracking is likely to happen are solved.

The invention relates to the technical field of high-performance aluminum alloy materials, in particular to a high-strength heat-resistant A < l >-Cu alloy based on an interface stabilization strategy and a preparation method thereof.The high-strength heat-resistant A < l >-Cu alloy comprises, by mass, 5.03% of Cu, 0.29% of Sc, 0.22% of Zr, 0.31% of Mn, smaller than or equal to 0.05% of single impurity elements, smaller than or equal to 0.15% of total impurity elements and the balance A < l >; after 1000 hours of thermal exposure at the temperature of 300 DEG C, the tensile strength is still larger than or equal to 300 MPa and is far superior to that of a traditional Al-Cu alloy, back-to-back synergistic segregation of Sc and Mn elements is achieved for the first time, theta '-phase coherent and semi-coherent interfaces are synchronously stabilized, the coarsening path is comprehensively blocked, the utilization rate of the Sc element is increased through the pre-aging technology, premature consumption of the Sc element is avoided, and the actual use cost of the expensive Sc element is reduced.

This invention discloses a high-elongation aluminum alloy for lightweight automotive components and its preparation method, relating to the field of aluminum alloy material technology. It features a hierarchical porous structure with surface micron-sized closed pores and a core nano-sized through-pore. The Ti and Mn elements synergistically form an Al-Ti-Mn martensitic phase transformation core region with Al, and the Cr element precisely controls the martensitic phase transformation initiation temperature to room temperature, ensuring stable triggering of the austenite-to-martensitic phase transformation and energy absorption during room-temperature collisions. This invention achieves initial impact buffering and gradual collapse energy absorption through a hierarchical porous structure with surface micron-sized closed pores and a core nano-sized through-pore. This dual energy absorption mechanism significantly improves the material's strength-ductility product, far exceeding that of traditional aluminum alloys.

The application discloses a high-elasticity-modulus magnetic memory alloy prepared based on a liquid die forging method and a preparation method thereof, and belongs to the technical field of magnetic memory alloy preparation. 51‑x Ni 25 Ga 24 Gd x , wherein x=0.4-0.6. The preparation method of the high-elasticity-modulus magnetic memory alloy prepared based on the liquid die forging method comprises the following steps: taking nickel powder, manganese powder, gallium powder and gadolinium powder according to atomic percentage, ball-milling and mixing, and then sequentially performing liquid die forging and pressure forming to obtain the high-elasticity-modulus magnetic memory alloy. The application adopts trace rare earth element Gd element to replace Mn element, and adopts a liquid die forging technology to prepare a high-performance magnetic memory alloy. The magnetic memory alloy has the characteristics of high elastic modulus and small brittleness, and solves the problems of large brittleness and low elastic modulus of the existing Mn2NiGa magnetic memory alloy.

This invention relates to the field of steel tensile strength calculation technology, and in particular to a method for calculating the tensile strength of 42CrMo steel used in engineering machinery. The method involves establishing a dimensionless model through data fitting between tensile strength and quenching temperature X1, tempering temperature X2, and the mass percentage of Mn element X3: Y2 = 5404 - 2.12X1 - 4.952X2 + 540X3. This invention can accurately reflect the quantitative relationship between the heat treatment process parameters of 42CrMo steel, especially the tempering temperature, and tensile strength. It can predict tensile strength, enabling engineers to accurately predict the final properties of the material when formulating heat treatment processes, and to actively and accurately control the tensile strength of the material by adjusting process parameters.

The invention relates to the technical field of metal materials, and particularly discloses light-weight high-toughness medium manganese steel and a preparation method and application thereof. The method comprises the following steps: firstly, pre-oxidizing a hot rolled plate in a specific low oxygen partial pressure atmosphere, and forming a compact Al2O3-MnO composite oxide layer which is well combined with a matrix on the surface in situ; and then, in multi-pass warm rolling, synchronous plastic deformation of the oxide layer and the base body can be achieved, and interface stripping is avoided. And finally, in the circulating annealing process, a surface oxide layer serves as a diffusion barrier to inhibit Mn element leakage and enrich the Mn element towards the core, so that the heterogeneous structure with the continuous gradient characteristic is successfully constructed, specifically, the surface layer is superfine martensite, the transition area is an austenite-ferrite double-phase structure, and the core is Mn-rich coarse grain austenite. The gradient tissue enables the material to have high strength, high wear resistance and high plasticity at the same time, and is suitable for medical instruments with comprehensive requirements for mechanical properties, light weight and biocompatibility, such as knee joint tractor fixing braces.

The application relates to a feed for metal injection molding, a preparation method of the feed and a metal product, wherein the preparation method of the feed comprises the following steps: S1, obtaining the following components according to weight parts: 40-50 parts of Fe elements, 2-8 parts of Ni elements, 20-25 parts of Cr elements, 20-25 parts of Co elements, 2-8 parts of Mo elements, 2-8 parts of Cu elements, 0.1-3 parts of Si elements, 1-3 parts of Mn elements, mixing and then heating to melt the material, and then adopting a high-pressure water-gas combined atomization method to obtain mixed powder; S2, obtaining a forming agent; S3, preheating the mixed powder obtained in S1 under vacuum conditions, then adding the forming agent into the mixed powder for mixing, and then performing plasticizing extrusion granulation to prepare the feed. The feed can meet the size precision requirements of MIM injection, green compact degreasing sintering and related post-process machining, the existing MIM materials on the market cannot simultaneously meet the problem of high polishable hardness, and the obtained metal product has the comprehensive advantages of appearance and hardness.

The invention discloses an alloy for hydrogen isotope gas storage and a preparation method thereof. The chemical formula of the hydrogen isotope gas storage alloy is ZrMn2-x, wherein x is more than or equal to 0.25 and less than or equal to 0.5. Compared with the prior art, the alloy has the following beneficial effects: 1, the alloy prepared by the invention has lower hydrogen absorption / desorption isotope equilibrium pressure, and when the alloy is used for tritium gas storage, the quantity of tritium remaining in a gas phase in the storage process can be greatly reduced, so that helium generated by decay of tritium remaining in the gas phase is reduced to the greatest extent; and 2, the prepared alloy does not contain catalytic active elements, and generation of tritiated methane gas in the tritium release process of the tritium storage alloy is avoided, so that the chemical purity of tritium gas is improved. And 3, the main element of the alloy is the low-cost Mn element, so that the cost of the hydrogen isotope gas storage alloy can be greatly reduced.

The present application belongs to the technical field of vacuum metallurgy, and discloses a method for precisely controlling manganese element in cobalt-based high-temperature alloy. The method calculates the designed addition amount of manganese element through an empirical formula, and controls the production process according to a specific melting process. The preparation method comprises the following steps: according to the target value of Mn element, the addition amount of Mn element is designed according to an empirical formula; the vacuum induction melting process of the alloy is designed according to the temperature and vacuum degree designed according to the empirical formula; and the production of the cobalt-based high-temperature alloy containing manganese element is carried out by using the designed melting process. The present application can realize the precise control of the manganese element in the cobalt-based high-temperature alloy, and the control error range is within ±10%, which greatly improves the quality stability of the cobalt-based high-temperature alloy master alloy.

The invention belongs to the technical field of ceramic materials, and particularly relates to a wide-temperature-range MAX-phase ceramic material and a preparation method thereof. The chemical general formula of the ceramic material is (Ti1-x-yMnxMoy) 3AlC2, the value range of x is greater than or equal to 0.15 and less than or equal to 0.25, the value range of y is greater than or equal to 0.05 and less than or equal to 0.15, and the sum of x and y is 0.3. The preparation method comprises the following steps: weighing titanium powder, manganese powder, molybdenum powder, aluminum powder and graphite powder according to a stoichiometric ratio, and additionally adding 1-3at.% of excessive aluminum powder; and carrying out ball-milling mixing, drying and sieving, and sintering by adopting a two-stage hot pressing sintering process to prepare the MAX phase ceramic material. Through Mo and Mn element solution strengthening, excessive Al adding and two-stage gradient heating sintering processes, the structural stability, the mechanical property and the tribological property of the material in the wide temperature range from the room temperature to 1600 DEG C are remarkably improved.

The invention belongs to the technical field of composite aluminum alloy, and discloses an aluminum alloy composite board and a corrosion-resistant aluminum alloy composite board. The aluminum alloy composite board is of a double-layer structure which comprises a core layer and a corrosion-resistant layer; the core layer comprises a Si element, a Fe element, a Cu element, a Mn element and a Mg element, and the anti-corrosion layer comprises a Zn element, the Si element and the Fe element; the corrosion-resistant aluminum alloy composite board is obtained by carrying out zinc impregnation treatment on the aluminum alloy composite board. And after zinc impregnation treatment, the difference value between the potential of a Zn-element-free diffusion area of the anti-corrosion layer and the potential of the innermost layer of the core layer is smaller than or equal to 150 mV. The corrosion-resistant aluminum alloy composite board shows excellent layered corrosion in a corrosion environment.

This invention relates to a low-resilience, corrosion-resistant 550MPa grade cold-rolled high-strength steel and its manufacturing method. The chemical composition of the steel plate, by weight percentage, is: C: 0.05%–0.075%, Si: 0.25%–0.3%, Mn: 1.41%–1.65%, Cr: 0.053%–0.077%, P≤0.010%, S≤0.010%, Al: 0.6%–2.8%, Ce: 0.02%–0.05%, with the balance being Fe and unavoidable impurities. The chemical composition is designed based on C, Si, and Mn elements. The addition of certain amounts of Al and Cr improves the steel's strength and corrosion resistance. The addition of a certain amount of Ce purifies grain boundaries and desulfurizes the steel. During the annealing process, the microstructure is controlled to obtain a material with a low yield strength ratio.

The invention provides a 7xxx series aluminum alloy plate strip for anodic oxidation with a high recovery ratio and a preparation method of the 7xxx series aluminum alloy plate strip. The 7xxx series aluminum alloy plate strip comprises the following elements of 0.06%-0.12% of Si element, 0.10%-0.25% of Fe element, 4.5%-5.5% of Zn element, 2.0%-3.0% of Mg element, 1.2%-2.0% of Cu element, 0.05%-0.15% of Mn element, 0.10%-0.15% of Er element, 0.10%-0.12% of Zr element, 0%-0.03% of Ti element and the balance aluminum element. The aluminum alloy plate strip is prepared through the steps of reclaimed material grading pretreatment, low-liquid-level semi-continuous casting, multi-stage homogenizing heat treatment, hot rolling, cold rolling, solid solution, pre-stretching, two-stage aging and the like. Through joint optimization of material components and the process, the finished plate strip has excellent mechanical performance, an oxidation film is uniform in color and luster, and salt mist resistance, friction resistance and the like are achieved.

This invention discloses a high-strength, high-toughness Al-Mg-Si alloy, belonging to the field of high-strength, high-toughness aluminum alloy preparation technology. This invention optimizes the alloy composition by adding Cu, Mn, Sc, and Zr elements, and combines this with vacuum melting, homogenization treatment, asymmetric hot extrusion, solution treatment, pre-strain treatment, and three-stage aging treatment processes to synergistically achieve a significant improvement in the strength and toughness of the aluminum alloy. Compared with conventional high-strength, high-toughness aluminum alloy production, the addition of Cu, Sc, Zr, and Mn elements, and the use of asymmetric hot extrusion + solution treatment + pre-strain treatment + three-stage aging treatment processes, results in a significant increase in both strength and toughness through the synergistic effects of grain refinement strengthening, dislocation strengthening, deformation strengthening, and second-phase strengthening. This ensures that the aluminum alloy achieves improved strength and toughness simultaneously, guaranteeing the overall performance of the finished product.

According to the ceramic material, the preparation method and the application, the ceramic material is composed of aluminum oxide, Y2O3 stabilized zirconium oxide with the mole percentage being 3% and (SrxBa1-x) (Al12-yCoy / 3Cry / 2Mny / 6) O19 tabular crystals, by introducing Ba, Sr, Cr, Co and Mn elements, the ceramic material meeting the performance requirement of surgical implants is prepared, according to YY / T 1294.2-2015 (ISO 6474-2-2019) standard tests, the performance of the ceramic material is excellent, the low-temperature hydrothermal aging phenomenon can be avoided, and the service life of the ceramic material is prolonged. The performance requirements of the surgical implant ceramic material can be met.

The invention discloses a TiFe-based hydrogen storage alloy and a preparation method thereof, and belongs to the field of metal hydrogen storage materials. The general chemical formula of the TiFe-based hydrogen storage alloy is TiaNdbZrcFedNieMnf, and the atomic percent of each element is as follows: 46 to 53 at% of Ti element, 0.1 to 1.5 at% of Nd element, 1 to 6.5 at% of Zr element, 27 to 40 at% of Fe element, 2 to 10 at% of Ni element and 4.5 to 12 at% of Mn element; wherein Ti, Nd and Zr are first metal elements, Fe, Ni and Mn are second metal elements, and the ratio of the total atomic percent of the first metal elements to the total atomic percent of the second metal elements is 1.05-1.20. The TiFe-based hydrogen storage alloy can be activated at room temperature, has proper hydrogen absorption and desorption platform pressure, and keeps high hydrogen storage capacity and high hydrogen absorption and desorption rate at the same time.

The invention belongs to the field of TiAl intermetallic compounds, and particularly relates to a high-strength and high-toughness cast TiAl alloy and a preparation method thereof. The TiAl alloy comprises the following components in atomic percent: 43 to 47 percent of Al, 1.6 to 3.2 percent of Mn, 1.5 to 2.5 percent of Nb, 0.6 to 1.0 percent of B and the balance of Ti. The TiAl alloy is prepared from the following components in percentage by mass: 28.0 to 31.0 percent of Al, 2.3 to 4.5 percent of Mn, 4.0 to 5.3 percent of Nb, 0.20 to 0.28 percent of B and the balance of Ti. The alloy component has the remarkable characteristics that the neutral Mn element is adopted to replace beta-phase stabilizing elements such as Mo, Cr, W and Ta, a brittle beta / B2 phase in a matrix is eliminated, an as-cast microstructure is in a fine full-lamellar morphology, and the comprehensive performance of the material is obviously improved. The nickel-based high-temperature alloy can replace nickel-based high-temperature alloy to stably work for a long time in the range of 600-700 DEG C, has excellent tensile strength and fracture toughness, has good casting fluidity and solidification feeding performance, and is suitable for preparing hot-end components in the aerospace field through a lost-wax investment casting method or a metal hard mold casting method.

The application discloses a TiAl alloy, a deformation heat treatment method and application, and the alloy is as follows: Ti-(43-48)Al-(0-8)X-(0-0.5)Z, wherein X is one or two or more of Nb, Mo, Cr, Ta, V and Mn elements; Z is one or two or more of Fe, C, N, O, B and Si elements; the alloy is a fine-grain duplex structure, the fine-grain duplex structure is composed of fine-size sheet group and equiaxial gamma grains; the size of the sheet group is 20-40 mu m, the size of the gamma grain is 10-20 mu m, and the volume fraction of the gamma grain is 30-60%; firstly, high-density crystal defects are generated in the original structure by controlling the deformation temperature, the deformation rate and the deformation amount of the pre-deformation treatment; and then, the fine-grain near-sheet structure or the duplex structure is obtained by controlling the holding temperature and the holding time in the isothermal heat treatment process.

The invention discloses a high-strength, high-plasticity and high-thermal-conductivity magnesium alloy and a preparation method thereof.The high-strength, high-plasticity and high-thermal-conductivity magnesium alloy is prepared from, by mass, 3%-6% of Al element, 0-0.2% of Mn element, 0.5%-3% of RE element and the balance Mg element; the RE element is any one of a Y element, a Gd element, an Er element and an Sm element; the grain of the high-strength high-plasticity high-thermal-conductivity magnesium alloy internally comprises an MgAl phase, the volume percentage of the MgAl phase is smaller than or equal to 20%, and the size is smaller than or equal to 300 nm. The high-strength high-plasticity high-thermal-conductivity magnesium alloy disclosed by the invention has the room-temperature yield strength of more than or equal to 200MPa, the tensile strength of more than or equal to 280MPa, the ductility of more than or equal to 20% and the thermal conductivity of more than or equal to 110W / (m.K), and can be applied to transportation tools such as new energy automobiles.

The invention belongs to the technical field of magnesium alloys, and relates to an ultrahigh-conductivity extruded magnesium alloy capable of conducting electricity uniformly and a preparation method of the ultrahigh-conductivity extruded magnesium alloy. Mn element microalloying modification treatment is carried out on Mg-Zn-Cu series magnesium alloys, and crystal grains of the alloys are remarkably refined in the hot extrusion process; and meanwhile, atomic aggregates formed by the Mn element and MgZnCu ternary phases are uniformly distributed on the grain boundary in the dynamic precipitation process, dislocation motion is effectively hindered, and therefore the mechanical property of the alloy is improved. In addition, due to the addition of Mn, dynamic precipitation of MgZnCu ternary phases is promoted, lattice distortion in an alpha-Mg matrix is reduced, and the conductivity of the alloy is synergistically improved. And the extrusion deformation magnesium alloy which has high strength and high conductivity and can conduct electricity uniformly is prepared.

The steel sheet according to an aspect of the present invention has a GDS profile of an Mn element and a GDS profile of an Si element, which are observed from the surface to the depth, sequentially including a maximum point and a minimum point, wherein a difference of converted concentration of Mn is 80% or more, and a difference of converted concentration of Si is 50% or more.

The application discloses a steel rail with good flash welding performance, and chemical components include C 0.60-0.74%, Si 0.30-0.60%, Mn 0.25-0.50%, Nb 0.01-0.04%, Ti 0.02-0.06%, P≤0.025%, S≤0.025%, wherein the ratio of the content of Mn element to the content of S element should be controlled to be 30-40, and the rest is Fe and inevitable impurities. The application aims to solve the problem that the Mn element gathered at the rail waist and rail bottom during the flash welding process of the steel rail for railway is easy to form oxides, resulting in more ash spot defects at the weld. The application provides a steel rail with good flash welding performance and a production method thereof. The alloy element regulation and the smelting, rolling and heat treatment process are used to realize the good matching of the welding performance and the mechanical performance of the steel rail, thereby improving the comprehensive use performance and the service life of the steel rail, and meeting the railway development requirement.