35 results about "Ce element" patented technology

The invention relates to the technical field of aluminum alloy materials, and provides a high-thermal-conductivity 6xxx aluminum alloy, a preparation method thereof and an electronic product structural part. Wherein the 6xxx aluminum alloy comprises the following components in percentage by mass: 0.3 to 0.5 percent of Mg, 0.2 to 0.35 percent of Si, 0.08 to 0.12 percent of Ce, less than or equal to 0.10 percent of Cu, less than or equal to 0.15 percent of Fe, less than or equal to 0.05 percent of Mn, less than or equal to 0.10 percent of Zn, less than or equal to 0.05 percent of Ti, less than or equal to 0.15 percent of total impurities and the balance of Al; and Mg / Si is in the range of 1.3 to 1.5. According to the 6xxx aluminum alloy and the preparation method thereof, the content and the mass ratio of Si and Mn are accurately regulated and controlled, meanwhile, a trace Ce element is added, the thermal conductivity and the anodic oxidation performance of the 6xxx aluminum alloy are improved, solid solution and aging processes are further matched, the beta ''phase and the grain size are controlled, and the alloy has the excellent anodic oxidation performance while having the high thermal conductivity.

The invention discloses a titanium alloy seamless tube and a preparation method thereof. The titanium alloy seamless tube comprises the following chemical components in percentage by mass: 5%-6.5% of Al, 1.5%-3% of Mo, 1.5%-2% of V, 3%-4% of Zr, 2.5%-3.6% of Sn, 0.5%-1.5% of Nb, 0.2%-0.5% of Si, 0.4%-0.6% of B, 0.8%-1.2% of Ce and the balance of Ti and other inevitable impurity elements. The preparation method comprises the working procedures of titanium alloy smelting, pipe blank casting, forging, heat treatment and cold rolling. According to the titanium alloy seamless tube, on the basis of TA15 alloy, components are optimized, the proportion of all the elements is regulated and controlled, and B and Ce elements in a specific proportion are further added; the preparation method is matched with the titanium alloy component, the structure uniformity and the surface quality of the pipe are improved, and the prepared titanium alloy seamless pipe has the excellent performance of high strength and high toughness.

The present application relates to the technical field of steel continuous casting, and particularly relates to a low-reactivity continuous casting protective slag for rare earth steel with high rare earth content and a preparation method thereof. The continuous casting protective slag of the present application comprises the following components in terms of mass fraction: CaO 16-22%, SiO2 22-28%, Al2O3 4-5%, MgO 1-2%, Na2O 9-12%, F ‑ 18-20%, Ce2O3 5-20%, and C 6-8%, and the rest is inevitable impurities. The continuous casting protective slag of the present application has suitable melting temperature, viscosity and surface tension, and the addition of rare earth oxide Ce2O3 can effectively inhibit the reaction between the Ce element in the molten steel and the components of the protective slag, and can be well applied to the rare earth steel with the Ce content in the range of 0.02-0.03%. After use, the physicochemical properties of the protective slag remain stable, and the continuous casting process is effectively ensured to run smoothly and the surface quality of the casting blank is ensured.

The invention provides a copper alloy pipe and a preparation method thereof. The copper alloy pipe is prepared from the following elements in percentage by mass: 0.5 to 2.1 percent of Al element, 0.5 to 2.0 percent of Si element, 0.5 to 2.0 percent of Ni element, 0.05 to 0.08 percent of Ce element, 0.05 to 0.1 percent of Cr element, 0.05 to 0.08 percent of V element, less than or equal to 0.02 percent of inevitable impurities and the balance of Cu element, an alpha phase and a beta phase exist in the copper alloy pipe, and the mass ratio of the alpha phase to the beta phase is (40-80): (20-60). The copper alloy pipe can give consideration to high strength, high conductivity and corrosion resistance, directional regulation and control of the double-phase proportion can be achieved by controlling the mass ratio of the alpha phase to the beta phase, optimization and adjustment are conducted according to the strength and conductivity requirements, and then the copper alloy pipe can be better applied to sea optical cable connecting pieces, underwater equipment connectors and other use scenes.

The invention discloses an IWCO composite target material and a preparation method thereof, and belongs to the technical field of transparent conductive oxide target materials. The method comprises the following steps: providing In2O3 powder, WO3 powder and CeO2 powder according to an atomic ratio of In: W: Ce of 1: (0.03-0.07): (0.02-0.04); carrying out plasma activation treatment on the WO3 and CeO2 powder to obtain active composite powder; dissolving In2O3, mixing with the active composite powder, generating a ternary coprecipitate through a coprecipitation reaction, washing, drying, calcining and converting into IWCO precursor powder, and grinding and granulating to obtain IWCO particles; carrying out gradient pressure forming to obtain a biscuit; and finally, the IWCO composite target material is prepared through a step-by-step sintering process including air degreasing, inert atmosphere presintering, reducing atmosphere hot-pressing densification sintering and air annealing. According to the method, Ce element atomic-level uniform solid solution is achieved through activation, coprecipitation and calcination, and the segregation degree is smaller than or equal to 0.4 at%; the sintering temperature is reduced by 120-180 DEG C in combination with step-by-step sintering, and the W volatilization rate is smaller than or equal to 0.7 The relative density of the obtained target material is greater than or equal to 99.2%, the resistivity is less than or equal to 1.9 * 10 <-4 > omega.cm, and the target material is suitable for photoelectric devices such as HJT solar cells and flexible OLEDs.

The application discloses a vacuum die-casting motor rotor casting aluminum alloy and a preparation method thereof. According to mass percentage, the vacuum die-casting motor rotor casting aluminum alloy comprises the following components: 3.0-6.5% of Ni elements, 0.3-1.0% of Fe elements, 0.2-0.4% of Mg elements, 0.02-0.1% of B elements, 0.1-0.6% of Ce elements, and the rest is Al, and the rest is impurity elements; wherein, the content of a single impurity element is less than 0.03%, and the total content of the impurity elements is less than 0.2%.

The application discloses a rare earth cerium micro-alloyed high-entropy alloy material and a preparation method thereof, and belongs to the technical field of rare earth alloy new materials. The method takes FeCoCrNiMn high-entropy alloy with an atomic ratio of 1:1:1:1:1 as a matrix, and adds 0.01%-0.1% of rare earth Ce elements in mass percentage; the alloy ingot is cast by vacuum induction melting and under the condition of circulating water cooling; then, the alloy ingot is subjected to homogenization annealing, secondary cold rolling and three times of annealing treatment, so that the rare earth cerium micro-alloyed high-entropy alloy material is obtained. The method significantly improves the strength and toughness of the alloy by combining the rare earth cerium micro-alloying with the multi-stage cold rolling and annealing process. The yield strength of the obtained high-entropy alloy is increased by 127 MPa at most, the tensile strength is increased by 164 MPa at most, and the fracture strain rate is increased by more than 2%. The method is stable in process, simple in operation and suitable for large-scale production.

The present application relates to the technical field of H13 steel chemical heat treatment, in particular to a method for preparing a diffusion layer by ion implantation Fe-Ce alloy assisted plasma nitriding of H13 steel and application thereof, first, the H13 steel is polished, then different doses of Fe-Ce elements are implanted on the surface of the H13 steel by ion implantation technology, and finally the implanted H13 steel is subjected to plasma nitriding. The purpose of the present application is to use high-energy ion implantation technology to preposition crystal defects such as vacancies and dislocations on the surface of H13 steel, promote the adsorption of nitrogen and facilitate solid solution strengthening, so as to improve the surface hardness; selecting Ce element implantation can reduce the energy barrier of N diffusion to the surface of iron, improve the thickness of the diffusion layer and accelerate the nitriding efficiency; therefore, under the same nitriding conditions, ion implantation Fe-Ce can realize thicker diffusion layer and higher surface hardness, which is helpful to improve the mechanical and friction and wear properties of H13 steel, and is applied to the mold of key parts in the production of automobile, aerospace and precision instrument field.

The invention relates to the technical field of railway steel production, and particularly discloses a Si-RE synergistically modified electric arc spraying zinc-aluminum-magnesium coating steel rail and a preparation method thereof.The preparation method comprises the steps that the steel rail is pretreated, and a clean steel rail with the cleanliness and roughness meeting the requirements is obtained; alloy coating spraying is conducted on the clean steel rail, and a coated steel rail is obtained; rare earth zinc aluminum magnesium alloy wires are adopted for alloy coating spraying and comprise Al, Mg, Si, Ce, Ti and the balance Zn. By adding trace Si and Ce elements into the alloy coating, the density of the coating is increased, the porosity of the coating is effectively reduced, the hardness, wear resistance and corrosion resistance of the coating are enhanced, hole sealing treatment does not need to be conducted again, the process is environmentally friendly, the prepared alloy coating is low in surface porosity and has the self-repairing capacity, and the service life of the alloy coating is prolonged. The steel rail has high binding force and excellent corrosion resistance, the service life of the steel rail can be remarkably prolonged, and a powerful guarantee is provided for railway transportation safety.

The invention discloses a pearlitic steel rail and a welding method of a joint thereof, the pearlitic steel rail is added with a specific amount of Ce element, and a specific joint welding method is adopted, so that the rail bottom pushing convex crack size of the obtained steel rail joint is reduced from more than 156 [mu] m to less than 25 [mu] m, and the average size of the pushing convex crack is reduced by more than 80%; the other structure properties of the joint meet TB / T 1632, meanwhile, the properties are remarkably improved, the average impact property is larger than 12.6 J, and the average hardness of the section hardness of the welded joint reaches 94%-98% of the average hardness of base metal.

The invention discloses a multi-stage combined rolling method for stainless steel resistant to corrosion of sulfate reducing bacteria. The multi-stage combined rolling method specifically comprises the steps that a Cu and Ce element synergistically doped stainless steel cast ingot prepared through a medium-frequency induction melting method is put into a heat treatment resistance furnace for heat preservation, water quenching treatment, grinding, cleaning and blow-drying; rolling the pretreated stainless steel cast ingot for the first time; rolling the stainless steel cast ingot rolled for the first time for the second time; carrying out third rolling on the stainless steel cast ingot subjected to the second rolling; putting the stainless steel cast ingot subjected to three-stage rolling into a furnace for heat preservation, and carrying out acid pickling and passivating treatment; and the stainless steel cast ingot subjected to passivation treatment is subjected to cold rolling and polishing, and the sulfate reducing bacteria corrosion resistant stainless steel is obtained. According to the method, the problems that the Cu and Ce-containing stainless steel is poor in hot working performance, easy to crack and easy to corrode when serving in an extreme environment are solved, and meanwhile, the tensile strength and the elongation of the stainless steel are synergistically improved.

The invention provides a calcium-based CO2 adsorbent as well as a preparation method and application thereof, and relates to the technical field of calcium-based adsorbents. The adsorbent is prepared by performing ultrasonic pickling on the carbide slag and doping one or more metal elements of Ce, Mg, Zr and Mn, preferably, the Ce element is doped, and the effect is optimal when the doping proportion of CeO2 is 10-15%. According to the adsorbent prepared by adopting the preparation method provided by the invention, due to the introduction of the metal oxide with high tower temperature, the pore structure of the adsorbent is obviously improved, CaO particles can be effectively anchored and isolated by an interfacial effect formed by the metal oxide and CaO, and the reaction activity of the adsorbent is enhanced; in the cyclic CO2 trapping process, the sintering resistance characteristic and the cyclic trapping performance are remarkably improved.

The invention relates to the related technical field of magnetic materials, and discloses a magnetic material formula and a preparation technology thereof.The magnetic material comprises, by mass, 0.85%-0.95% of B, 0.1%-0.3% of Cu, 0.5%-1% of Al, 0.5%-1% of Co, 0.1%-0.5% of Ga, 0.5%-1.5% of Ho, 0.2%-1% of Dy, 18%-25% of PrNd and 8%-10% of Ce. Compared with a traditional formula, the Ce element lower in price in the formula is greatly used, the cost price of the formula is greatly reduced, and the cost is reduced by about 10%; it is found that the comprehensive magnetic performance is optimal at the second-stage aging temperature of 520 DEG C, in a conventional magnet, a large number of CeFe phases can be formed in the magnet due to addition of a high Ce element, the comprehensive magnetic performance of the magnet is greatly damaged, the adverse effect of Ce element doping is eliminated to the maximum extent through the synergistic effect of multiple elements under the optimal technological condition, and the comprehensive magnetic performance of the magnet is greatly improved. And the amplitude is reduced by 10% under the condition that the magnetic performance is not influenced.

The invention discloses a preparation method of a GH4698 alloy bar for improving room temperature and impact performance. The preparation method comprises the following steps: preparing a high-temperature alloy ingot by adopting a vacuum induction and vacuum self-consumption double-vacuum melting mode; and the bar with the specification of phi 200mm is prepared by adopting a high-temperature homogenization and fast forging forming mode. According to the method, the high-performance GH4698 bar is creatively prepared by optimizing the Ce element content, purifying the impurity content of the grain boundary, not weakening the pinning effect of grain boundary carbide, reducing the crack cracking tendency of the grain boundary and remarkably improving the bonding strength of the grain boundary through the mode of double vacuum smelting, homogenization and fast forging forming; the problem that the warm tensile property and the impact property of the current GH4698 bar do not meet the technical requirements is solved.

The embodiment of the application discloses a chemical analysis method for residual cerium oxide of a glass substrate, comprising the following steps: placing the peeled glass substrate into an acidic solution and uniformly covering the surface of the glass substrate, taking out the glass substrate after standing and cleaning the surface of the glass substrate with ultrapure water, pouring the cleaned liquid into the original soaking hydrofluoric acid to form a soaking solution; transferring the soaking solution into a polytetrafluoroethylene digestion tank and placing it on an electric heating furnace for heating and drying, adding concentrated hydrochloric acid for multiple times for dissolving after the liquid is completely dried, and cooling and cleaning after dissolving to configure a solution; formulating a standard solution configuration table for the configured solution, measuring the Ce element concentration C Ce of the to-be-measured solution according to the element detection spectral line condition, and measuring the Ce element concentration C Ce0 of the reagent blank solution, wherein the method is used for pre-treating the glass, and the content of the residual cerium oxide on the surface of the glass substrate is rapidly analyzed after grinding.

The invention discloses a high-entropy rare earth cerate ceramic coating for shielding neutrons and X-rays and a preparation method of the high-entropy rare earth cerate ceramic coating, and belongs to the technical field of radiation protection materials. The general formula of the chemical composition of the coating is (Sm < 0.2 > Gd < 0.2 > Er < 0.2 > Tm < 0.2 > Yb < 0.2 >) 2Ce2O7, and the coating has an A2B2O7 type pyrochlore or defective fluorite structure. A site is formed by atomic-scale mixing of five rare earth elements including Sm, Gd, Er, Tm and Yb, the molar content of each element is 5%-35%, and neutron and X-ray shielding functions are synergistically exerted through high-entropy design; and B site is Ce element. The preparation method comprises the following steps: proportioning corresponding oxides in proportion, performing ball milling, performing high-temperature sintering to synthesize high-entropy ceramic powder, performing spray drying granulation, and performing deposition on the surface of a matrix treated by the NiCoCrAlY bonding layer by adopting an atmospheric plasma spraying technology to form the coating. Atomic-scale uniform distribution of multiple functional elements is achieved through high entropy, a shielding blind area of a traditional composite material is eliminated, and the coating has the advantages of efficient cooperative shielding, excellent anti-radiation stability and environment friendliness and is suitable for radiation protection in the fields of aerospace, nuclear energy, medical treatment and the like.

The present application relates to a kind of based on computational thermodynamics optimization rare earth Ce modified Al-Si-Mg base casting alloy heat treatment process method, belong to casting aluminum alloy heat treatment technical field.The steps of the method of the present application include: constructing thermodynamic database, the solid solution temperature curve of Mg2Si aging strengthening phase in the alloy to be handled, the equilibrium dissolution temperature of AlSiCe rare earth phase and the influence law of Ce element on Al matrix vacancy formation energy;Select temperature interval as solid solution treatment window, carry out solid solution treatment and quenching cooling to form supersaturated solid solution;Subsequently, artificial aging treatment is carried out, and the aging temperature is determined according to the influence law of the vacancy formation energy.The present application accurately determines the temperature window by thermodynamic calculation, which takes into account the full solid solution of Mg2Si phase and the thermal stability of AlSiCe rare earth phase, realizes the synergistic regulation of aging strengthening phase and rare earth phase, and effectively improves the comprehensive mechanical properties of alloy.

The application discloses a high-cerium-content and high-purity industrial pure iron smelting production method, and belongs to the technical field of special steel smelting in the steel metallurgy. The method realizes the "ultra-pure" pretreatment of the molten steel through a set of coupled process design, creates an "inert" environment for the addition of Ce, and then realizes the efficient and stable alloying of the Ce element through a unique addition time, mode and protection means, so that the high-cerium-content and high-purity industrial pure iron with the Ce content being greater than or equal to 0.50%, the total impurity content being extremely low and the composition being uniform is finally produced.

The invention provides an aluminum alloy and a preparation method thereof. The aluminum alloy comprises the following elements in percentage by mass: 12-16% of Ce element, 0.2-0.6% of Sc element, 0.4-0.8% of Zr element, less than or equal to 0.15% of inevitable impurities and the balance of Al element, wherein at the room temperature, the tensile strength of the aluminum alloy ranges from 500 MPa to 610 MPa, and the ductility ranges from 5% to 12%; at the temperature of 300 DEG C, the tensile strength of the aluminum alloy is 230-260 MPa, and the ductility is 8-15%; in the aluminum alloy, the mass content of an Al11Ce3 phase is 0.20%-0.28%, and the mass content of an Al3 (Sc, Zr) phase is 0.014%-0.020%. The aluminum alloy disclosed by the invention has excellent room-temperature mechanical properties and high-temperature mechanical properties, and can better meet the requirements of the aerospace field on the heat-resistant aluminum alloy.

A phosphor powder including phosphor particles which are a phosphor represented by a general formula Mx(Si, Al)2(N, O)3±y (where M is Li and one or more alkaline earth metal elements and 0.52≤x≤0.9 and 0.06≤y≤0.36 are satisfied) and in which a part of M is substituted with a Ce element, wherein a Si / Al atomic ratio is equal to or more than 1.5 and equal to or less than 6, an O / N atomic ratio is equal to or more than 0 and equal to or less than 0.1, 5 to 50 mol % of M is Li, and 0.5 to 10 mol % of M is Ce, and a total content of a Cr element, a Fe element, and a Ni element in the phosphor powder is equal to or less than 20.0 ppm.

The application provides a copper alloy pipe and a preparation method thereof. The copper alloy pipe comprises the following elements in percentage by mass: 0.5-2.1% of Al element, 0.5-2.0% of Si element, 0.5-2.0% of Ni element, 0.05-0.08% of Ce element, 0.05-0.1% of Cr element, 0.05-0.08% of V element, the total content of inevitable impurities is less than or equal to 0.02%, and the balance is Cu element; the copper alloy pipe comprises alpha phase and beta phase, and the mass ratio of the alpha phase to the beta phase is 40-80:20-60. The copper alloy pipe can have high strength, high conductivity and corrosion resistance, the directional regulation of the ratio of the alpha phase to the beta phase can be realized by controlling the mass ratio, the adjustment can be optimized according to the requirements of strength and conductivity, and the copper alloy pipe is better applied to the scene of sea optical cable connecting piece and underwater equipment joint.

The invention discloses a method for improving the drawing performance of welding wire steel by using a rare earth Ce element, which comprises the following steps: during the production of the welding wire steel, controlling the initial oxygen content in the steel to be less than or equal to 50ppm and the sulfur content to be less than or equal to 0.005%; at the final stage of molten steel refining, Ce-Fe alloy wires or rare earth cerium-iron alloy are fed into molten steel through a wire feeding machine, and the adding amount of Ce is 0.005-0.010% of the mass of the molten steel; after rare earth Ce is added, soft blowing stirring is immediately carried out, the temperature of molten steel is 1550-1600 DEG C, the soft blowing stirring time is not shorter than 8 minutes, and the average particle size is controlled to be smaller than or equal to 3 microns; after the molten steel is cast, a controlled rolling and controlled cooling process is adopted, the finish rolling temperature is controlled to be 900-950 DEG C, uniform distribution of rare earth silicate inclusions is promoted, and segregation is avoided.

The application relates to the field of hard protective coatings, in particular to a rare earth modified Ti-Al-N series magnetron sputtering cutter coating preparation method. ‑3 After being heated to a background vacuum degree of less than 3*10 After being heated to a background vacuum degree of less than 3*10 After being heated to a background vacuum degree of less than 3*10 The pure Ti underlayer and the TiAl transition layer are used to realize composition gradient transition and relieve interface stress, and the Ce element is used for doping to refine the grains and make the coating change into a dense fine-grained structure, so that the film-base bonding force, hardness and wear resistance of the coating are remarkably improved.

The application relates to a copper-iron alloy strip for a lead frame, which comprises, in percentage by mass: P 0.010wt%-0.100wt%; Fe 2.0wt%-3.0wt%; RE 0.005wt%-0.05wt%; Cu and impurities; wherein the RE is selected from La or / and Ce. The copper-iron alloy strip for the lead frame of the application controls the particle size of the Fe3P second phase by controlling the mass percentage of P and Fe elements, and refines the grain by adding La elements or / and Ce elements; and the preparation method of the application can significantly reduce the surface roughness and gloss of the strip, thereby meeting the performance parameter requirements for application to the lead frame.

The application discloses a kind of cerium-rich R-T-B series sintered magnets and preparation method thereof, the preparation method includes the following steps: S1, preparation mixed powder, the mixed powder is obtained by the first R-T-B series alloy powder of cerium-rich rare earth and the second R-T-B series alloy powder of cerium-poor rare earth is mixed uniformly, wherein, the sphericity of the first R-T-B series alloy powder is not less than 0.75;S2, mixed powder is prepared into R-T-B series sintered magnet.The preparation method constructs the grain shell layer of low Ce content in the interior of cerium-rich R-T-B series sintered magnet, to improve the intrinsic coercivity of cerium-rich R-T-B series sintered magnet.By the preparation method of the application, high-performance R-T-B series sintered magnet rich in Ce element can be prepared, and the application of Ce resources in R-T-B series sintered magnet is promoted.

The application discloses a novel high-strength wear-resistant steel material and a heat treatment process and application thereof in a shield tunneling machine. The novel high-strength wear-resistant steel material comprises the following components in percentage by mass: C 0.65%-0.75%, Cr 6.50%-7.50%, V 1.70%-2.20%, Mo 2.00%-2.50%, Si 0.70%-1.20%, Mn 0.06%-0.50%, Ce 0.02%-0.03%, Ti 0.05%-0.08%, P≤0.03%, S≤0.03%, and the balance of Fe. The novel high-strength wear-resistant steel material is optimized by controlling and optimizing rare earth Ce elements and Ti elements, combined with spheroidizing annealing, high-temperature quenching and high-temperature tempering processes, so that the novel high-strength wear-resistant steel material has excellent mechanical properties, and exhibits a tensile strength of more than 2600 MPa while maintaining a hardness of more than 60HRC.

The application discloses a method for improving the internal quality of 280*380 mm section bearing steel continuous casting billets by using rare earth Ce elements, and the process route is KR molten iron pretreatment-top and bottom combined blowing converter-LF refining-VD vacuum degassing-CCM 280*380 mm section continuous casting machine; wherein: the LF off-site molten steel temperature is 1620 DEG C >=T>=1635 DEG C; the slag basicity R is >=6.0, and the slag TFe is <=1.0%; after entering the VD process, the vacuum extraction operation is carried out; the deep vacuum time is >=15 minutes; after breaking the vacuum, the wire feeding operation is carried out, and after the wire feeding is finished, 30% content Ce ferroalloy is added; after the rare earth alloy is added, the refining soft blowing process is started, and the post-soft blowing time is >=15 minutes; after the soft blowing is finished, the steel is poured. The application utilizes the operation of rare earth Ce in the steel to refine the solidification structure grains, selects the appropriate process, reduces the proportion of dendritic crystal zone of the continuous casting billets, improves the proportion of equiaxed crystal of the continuous casting billets, and improves the internal quality of the continuous casting billets.

The invention discloses a cerium-containing sintered Re-Fe-B permanent magnet and a preparation method and application thereof, the sintered Re-Fe-B permanent magnet contains Ce element, and the content of Ce is larger than or equal to 6 wt%; the sintered Re-Fe-B permanent magnet is provided with a CeFe2 phase, and the CeFe2 phase is located in a crystal boundary phase of the magnet. According to the method, the angle between the tundish and the quenching roller is controlled in the smelting process, uniformly-distributed columnar crystals can be obtained, the forming proportion of a harmful phase CeFe2 is controlled, meanwhile, main phase grains can be more uniformly wrapped by a Re-rich phase, and a uniform and wide grain boundary phase is formed. And through regulation and control of an aging process, the CeFe2 phase is preferentially separated out at the grain boundary of two grains instead of the interior of the main phase, meanwhile, aggregation of the CeFe2 phase at the triangular grain boundary is controlled, and the coercive force is improved through the pinning effect of the grain boundary phase, so that damage of the CeFe2 phase to the magnetic performance is reduced.

The invention discloses a high-performance rare earth maritime work steel plate and a production method thereof, and belongs to the technical field of steel and iron material processing. The marine steel comprises the following chemical components in percentage by mass: 0.09 to 0.12 percent of C, 0.20 to 0.30 percent of Si, 1.30 to 1.50 percent of Mn, less than or equal to 0.009 percent of P, less than or equal to 0.0020 percent of S, 0.10 to 0.20 percent of Ni, 0.10 to 0.20 percent of Cr, 0.015 to 0.025 percent of Nb, 0.020 to 0.040 percent of Al, 0.003 to 0.007 percent of Ce and the balance of iron and inevitable impurities. The production method comprises the working procedures of heating, rolling, rapid cooling after rolling and tempering. The maritime work steel plate with excellent comprehensive mechanical properties and good low-temperature impact toughness can be obtained by adding the Ce element and combining the two-stage controlled rolling and the after-rolling rapid cooling process, off-line quenching is not needed, the production process is simple, and the cost is low.

The invention provides a magnesium alloy with high toughness and high heat-conducting property as well as a preparation method and application thereof, and belongs to the technical field of alloy materials. The Al, Y, Gd, Nd and Ce elements are used as alloying elements, the strength of the magnesium alloy can be effectively enhanced through addition of the Al element, other rare earth elements are low in solid solubility and can easily form intermetallic compounds with the Al element, the content of solid solution elements in crystal lattices is effectively reduced, and then the heat conductivity of the magnesium alloy is improved; meanwhile, the rare earth element and the Al element form a rich intermetallic compound, the strength of the magnesium alloy can be effectively enhanced, and the grain size of the magnesium alloy is reduced. By designing alloy elements and preferably selecting high-thermal-conductivity alloying elements, the lattice distortion of a magnesium matrix is reduced, so that the high-strength and high-thermal-conductivity properties of the magnesium alloy are improved.