527 results about "Ti element" patented technology

The invention provides a titanium alloy-based composite coating structure, a method for inhibiting upward dilution of Ti during cladding of a wear-resistant layer on the surface of a titanium alloy and application of the titanium alloy-based composite coating structure. The method comprises the steps that an aluminum bronze barrier layer is formed on a titanium alloy substrate, the phase structure of the aluminum bronze barrier layer comprises a Cu phase and a Cu2TiAl phase, the Cu phase and the Cu2TiAl phase are each of an FCC crystal structure, and the Cu2TiAl phase is formed by reacting Ti in the titanium alloy substrate with Cu and Al; the volume ratios of a Cu phase and a Cu2TiAl phase in the aluminum bronze barrier layer are 40%-45% and 55%-60% respectively; and forming the transition alloy wear-resistant layer on the titanium alloy substrate with the aluminum bronze barrier layer by adopting a laser cladding technology. The aluminum bronze barrier layer is arranged to reduce upward dilution of Ti elements in the cladding process of the transition alloy wear-resistant layer, generation of a large number of hard brittle phases is avoided, the difference between the wear-resistant layer and a titanium alloy matrix in the thermophysical property aspect is relieved, and coating cracking is reduced.

The invention discloses a high-entropy alloy wear-resistant coating with a silicon-containing transition layer for improving the wettability of a copper surface and a laser cladding method, and relates to the technical field of alloy coatings. The method comprises the following steps: providing silicon-containing transition layer alloy powder and CoCrFeNiTi series high-entropy alloy powder; providing a copper base material, and cleaning the surface to be cladded of the copper base material; cladding silicon-containing transition layer alloy powder on the surface of the copper base material by adopting a laser cladding process under a protective atmosphere to form a silicon-containing transition layer; and under the protective atmosphere, CoCrFeNiTi series high-entropy alloy powder is cladded on the surface of the silicon-containing transition layer through a laser cladding process, and the high-entropy alloy wear-resistant coating is formed. According to the high-entropy alloy coating disclosed by the invention, the Si element in the transition layer can be subjected to interface reaction with a copper substrate to form a Cu-Si solid solution phase with low interface energy, so that the interface tension between copper and a subsequent cladding coating is remarkably reduced, and the wettability between the copper substrate and a coating material is fundamentally improved; the high-entropy alloy coating is successfully cladded on the copper surface with poor wettability.

The application discloses a composite precipitation strengthening type high-entropy alloy and a preparation method thereof, and belongs to the field of metal material preparation. The high-entropy alloy is composed of Al, Co, Cr, Fe, Ni, Cu, V and Ti elements, and a general formula thereof is Al a Co b Cr c Fe d Ni e Cu f V g Ti h , wherein 2 <= a <= 4, 16 <= b <= 20, 16 <= c <= 20, 16 <= d <= 20, 35 <= e <= 40, 0 <= f <= 3, 0 <= g <= 3, 0 <= h <= 3, and a + b + c + d + e + f + g + h = 100. The high-entropy alloy is prepared through vacuum arc melting and heat treatment, and has excellent mechanical properties. The various metal raw materials used are environment-friendly, the preparation process is relatively safe, and the high-entropy alloy can be industrially produced.

The invention discloses a CuCr contact and a preparation method thereof, and belongs to the field of alloy contact manufacturing, the CuCr contact is divided into an arc contact area, a transition area and a conductive connection area, and the Cr content of each area is in gradient distribution and is sequentially reduced, so that interface stress concentration can be avoided, and the structural compatibility and mechanical reliability of the whole contact are improved; meanwhile, integrated forming is achieved through the 3D printing technology, the size and the component boundary of each area can be accurately controlled, the complex structure design requirement of the contact is met, and the problems that in the prior art, performance gradient cannot be achieved according to the function requirements of different parts of the contact, and the material utilization rate is low are solved; the printed contact does not have the phenomena of composition segregation, agglomeration, uneven pores and the like, and the problems that in the prior art, Cr elements are difficult to distribute uniformly in a Cu matrix, Cr particles are prone to segregation and agglomeration, local ablation resistance is insufficient, and burning resistance is low are solved.

The invention discloses a high-strength and high-plasticity copper alloy and a preparation method thereof. The high-strength and high-plasticity copper alloy is prepared by mixing Cu-Al pre-alloyed spherical powder and CuO powder according to the mass ratio of (100-150): 1, wherein the Cu-Al pre-alloyed spherical powder and the CuO powder are different in particle size range. The solid solution state Al element part in the high-strength plastic copper alloy is oxidized into Al2O3 through CuO, and the Al2O3 exists in a Cu matrix. The preparation method comprises the following steps: (1) mixing Cu-Al pre-alloyed spherical powder with CuO powder, and drying; (2) cold isostatic pressing treatment; (3) vacuumizing, sintering at a high temperature in a protective atmosphere, and cooling; (4) vacuumizing, reducing in a reducing atmosphere, and cooling; and (5) after preheating, the copper alloy reduction blank is placed in a rotary forging die, rotary forging and air cooling are conducted, and the copper alloy is obtained. The high-strength plastic copper alloy is good in conductivity and mechanical property and high in plasticity. The method is simple in process, environmentally friendly, low in cost and suitable for industrial production.

Disclosed is a lightweight, high-strength, corrosion-resistant aluminum alloy material, including: Mg 6.0-10.0 wt %, Zn 1.0-3.5 wt %, Si 0.1-1.3 wt %, and at least one of Mn, Cu, Zr, Sc, and Ti elements with a total amount of not greater than 0.8 wt %, and a balance of Al and inevitable impurities. Further disclosed are a method of producing a deformed aluminum alloy material, a method of producing a casting aluminum alloy material, a product and a final construct. The aluminum alloy material exhibits excellent low density, high strength, corrosion resistance, and damage resistance.

The invention relates to the technical field of alloy materials, in particular to a tungsten-zirconium active material and a preparation method thereof. The tungsten-zirconium active material provided by the invention is prepared from the following elements in percentage by mass through a specific preparation method: 55-85% of W, 10-35% of Zr and 3-30% of other elements, and the other elements are more than two of Ti, Nb, Hf and Mo. The content of W is controlled to be 55-85%, so that the density of the material is 11 g / cm < 3 > or above, the high strength of the material is ensured, and the material has kinetic energy penetration capacity; the content of Zr is 10% or above, and it is guaranteed that the material has certain activity; and the addition of other elements such as Ti, Nb, Hf and Mo inhibits the generation of a W2Zr brittle phase, so that the plasticity of the tungsten-zirconium active material is improved. And by combining with a specific preparation method, the prepared tungsten-zirconium active material has high plasticity while having high strength and high density.

The invention relates to a TiC-SiC reinforced 304 stainless steel composite coating based on high-speed laser cladding and a preparation method of the TiC-SiC reinforced 304 stainless steel composite coating. The composite coating with 304 stainless steel as a metal matrix phase and TiC and SiC as ceramic reinforced phases is prepared on the surface of a steel matrix by adopting a high-speed laser cladding technology. In the cladding process, the TiC ceramic particles keep stable in structure, the SiC ceramic particles are subjected to controllable partial decomposition, the Si element released through decomposition forms a Si enrichment area on the interface of the ceramic particles and the metal matrix, and the C element released through decomposition reacts with the metal matrix to generate a carbide phase. Therefore, the composite coating which is compact in structure and good in interface bonding is obtained and is suitable for surface protection of steel components serving under the working condition of coupling abrasion and corrosion.

The invention relates to the technical field of metal material additive manufacturing, in particular to an additive manufacturing TiAl alloy structure homogenization method. According to the method, 1.5 at.%-2.5 at.% of an Al element is added into a TiAl alloy for compensation, then TiAl alloy powder is prepared, electron beam selective melting printing is carried out, short-time circulating heat treatment is carried out after hot isostatic pressing treatment is carried out, the temperature in the short-time circulating heat treatment process is 5-20 DEG C higher than T alpha / (alpha + gamma), and heat preservation is carried out for 3-10 min; according to the method, the problem of non-uniform structure of the TiAl alloy formed by SEBM is synergistically solved by compensating the content of Al element and a short-time circulating heat treatment process, a uniform and fine lamellar structure can be obtained without a complicated process parameter optimization process, the size of a lamellar cluster is smaller than 100 microns and is far lower than that of a lamellar cluster prepared by conventional heat treatment, and the method is suitable for large-scale production. The room-temperature tensile strength of the alloy is at least improved by 150MPa, and the tensile strength at 750 DEG C is at least improved by 80MPa. The process method is simple and high in adaptability, and can be widely applied to additive manufacturing of the TiAl alloy.

The present disclosure relates to an accelerator lead-out window and a preparation method thereof, wherein an overall structure of the accelerator lead-out window is integrally formed by adopting an additive manufacturing method; a window film is made of titanium alloy, and each component ratio is calculated by a weight percentage, wherein Al:4.5-7.5%, Mo:4.1-6.9%, V:4.1-6.9%, Nb:3.1-4.5%, Cr 1.5-3.5%, Ta:0.5-1.5%, and the remaining amount is titanium and other unavoidable elements. A window frame is made of aluminum alloy, and each component ratio is calculated by a weight percentage, wherein Zn:5.1-6.9%, Mg:2.1-3.9%, Cu:1.2-3.9%, Cr:0.18-0.28%, Fe≤0.30%, Si≤0.15%, Ti≤0.15%, Mn≤0.10%, and the remaining amount is Al and other unavoidable elements.

The invention belongs to the technical field of metal materials, and particularly relates to a high-strength corrosion-resistant heat-treatment-free die-casting aluminum alloy and a preparation method thereof. The aluminum alloy comprises, by mass, 5.5%-7.1% of Mg, 2.5%-3.5% of Si, 0.5%-0.75% of Mn, 0.11%-0.7% of Cu, 0.08%-0.15% of Fe, 0.05%-0.1% of Mo, 0.02%-0.05% of V, 0.01%-0.05% of Zr, 0.03%-0.09% of Y and the balance Al and inevitable impurity elements, the content of a single impurity element is smaller than or equal to 0.02%, and the total content of the impurity elements is smaller than or equal to 0.2%. And the mass ratio of the Mg element to the Cu element in the aluminum alloy components is in the range of (10: 1)-(50: 1). The heat-treatment-free die-casting aluminum alloy provided by the invention is high in yield strength and obvious in weight reduction effect.

The application discloses a preparation method of a high-strength cast magnesium alloy, the alloy containing two non-rare-earth strengthening alloy elements of Sr and Ti, wherein the Ti element is preferentially combined with Al to form AlTi or Al3Ti intermetallic compounds and is gathered along the grain boundary, hindering the growth of alpha-Mg grains, the remaining Al element is combined with Mg to form a beta phase, the grain size is reduced, the morphology of the beta phase is improved, and thus the mechanical properties are improved; the Sr element can strengthen the beta phase on one hand, and can consume the Al element at the solidification front by forming a new Al4Sr phase, so that the volume fraction of the beta phase is reduced; in addition, the Sr element can form an adsorption film of strontium on the grain growth interface as a surface active element, so that the grain growth speed is reduced, the alloy has more time to generate more crystal nuclei when solidifying, and the grains are refined; under the synergistic effect of the two elements, the strength of the magnesium alloy is significantly improved.

The invention relates to a material for a cutting tool used in an irradiation environment and a preparation method of the material, belongs to the technical field of mechanical tools, and aims to solve the problem of short service life caused by insufficient wear resistance and toughness of the cutting tool used in the irradiation environment in the prior art. The material for the cutting tools used in the irradiation environment is prepared by adopting a specific element ratio, WC or WC and TiC serve as a hard phase, it is ensured that the material has good wear resistance, and Fe, Ni, Cr, C, Mo and Ce serve as bonding phases, so that the material has high toughness. According to the method, firstly, Fe serves as a matrix, a small amount of elements such as Cr, Ni and Mo are added, Fe-based alloy powder is formed through a metallurgical chemistry method, then the alloy powder and a hard phase are mixed and subjected to cold isostatic pressing forming, then vacuum liquid phase sintering is adopted, and the steel bond hard alloy with steel as the matrix and WC or WC and TiC as the hard phase is formed. The material uniformity is good, the production efficiency is high and the cost is low.

In a copper alloy bonding wire for semiconductor devices, the bonding longevity of a ball bonded part under high-temperature and high-humidity environments is improved. The copper alloy bonding wire for semiconductor devices includes in total 0.03% by mass or more to 3% by mass or less of at least one or more kinds of elements selected from Ni, Zn, Ga, Ge, Rh, In, Ir, and Pt (first element), with the balance Cu and inevitable impurities. The inclusion of a predetermined amount of the first element suppresses production of an intermetallic compound susceptible to corrosion under high-temperature and high-humidity environments at the wire bonding interface and improves the bonding longevity of a ball bonded part.

The invention provides a Cu-Ti alloy and a preparation method thereof. The Cu-Ti alloy comprises the following components in percentage by mass: 3.0-3.5 wt% of Ti element, less than or equal to 0.05 wt% of B element, less than or equal to 0.05 wt% of Zr element and the balance of Cu element, the Cu-Ti alloy comprises a beta '-Cu4Ti precipitation phase with the size being 3 nm to 7 nm, a beta'-Cu4Ti precipitation phase with the size being 8 nm to 12 nm and a beta '-Cu4Ti precipitation phase with the size being 13 nm to 20 nm. The precipitated phases comprise microstructures with the size ranges of 3-7 nm, 8-12 nm and 13-20 nm, the microstructures jointly act on an alloy matrix, the strength, plasticity and conductivity of the Cu-Ti alloy material are remarkably improved, and therefore the problem that the Cu-Ti alloy material is difficult to give consideration to excellent strength, conductivity and plasticity at the same time is solved.

The application discloses a method for eliminating thermal cracks in nickel-based alloy additive repair, which comprises the following steps: firstly, quantitatively analyzing elements contained in the nickel-based alloy, and simulating a solidification curve based on thermodynamics according to the elements; secondly, obtaining a CSI-fs curve based on the solidification curve; thirdly, designing a heat treatment system through thermodynamic simulation, and performing composition homogenization treatment on the nickel-based alloy; and finally, performing electron beam additive repair. Results show that the nickel-based alloy treated by the method does not produce cracks during the additive repair, i.e., the thermal cracks are eliminated, the connection is stable, and the crack-free additive repair is successfully realized.

This invention provides a 590MPa grade solid welding wire, a laser-arc hybrid welding process, and a welded joint. The composition system of this invention is precisely adapted to the rapid heating and cooling thermal cycle characteristics and the burn-off law of key alloying elements in laser-arc hybrid welding of 590MPa grade marine engineering steel. By strictly controlling the content of highly hardenable elements such as C, Mn, Ni, and Mo, the formation of hardened structures in the weld metal is avoided. A certain amount of Ti element is added to provide nucleation points within the grains, directionally inducing the formation of a highly oriented and complex acicular ferrite matrix structure, thereby simultaneously improving strength and toughness through grain refinement. At the same time, an appropriate amount of V element is added to further improve the strength margin of the weld metal through microalloying. This welding wire has excellent welding processability and crack resistance, and can achieve room temperature welding without preheating or post-heating, providing material support for the high-quality and high-efficiency construction of marine engineering equipment.

The invention provides a method for testing the copper diffusion depth of an aluminum alloy clad aluminum plate. The method comprises the following steps: pretreating the aluminum alloy clad aluminum plate; and carrying out line scanning on the pretreated aluminum alloy clad aluminum plate by utilizing an energy disperse spectroscopy, and obtaining the copper diffusion depth of the aluminum alloy clad aluminum plate according to an obtained Cu element curve. According to the test method provided by the invention, the concentration distribution gradient of the Cu element in the coating layer of the aluminum alloy coated aluminum plate is reflected by utilizing energy disperse spectroscopy line scanning, the influence caused by test operations such as etching is avoided, the copper diffusion depth of the coating layer can be truly reflected, and the accuracy of copper diffusion depth data is ensured.

The invention discloses a method for improving creep resistance of a rare earth magnesium alloy, which comprises the following steps: S1, casting an ingot blank according to the mass percent of each component (0-6% of Y element, 1-3% of Nd element, 0.1-0.5% of Zr element and the balance of Mg element) in the rare earth magnesium alloy; s2, the ingot blank is subjected to solution treatment; s3, the material obtained after solution treatment is subjected to rolling deformation, the rolling deformation temperature ranges from 450 DEG C to 520 DEG C, the reduction rate ranges from 15% to 25%, and the roller linear speed ranges from 2 mm / s to 200 mm / s; and S4, the rolled and deformed material is subjected to aging treatment, the aging treatment temperature ranges from 180 DEG C to 260 DEG C, and the aging treatment time ranges from 5 h to 70 h. According to the method disclosed by the invention, an originally harmful and unavoidable precipitation-free zone formed along a grain boundary is converted into a precipitation-free zone which is beneficial to creep resistance and is uniformly distributed along an intragranular deformation zone, and the creep resistance is remarkably improved.

The present invention provides line pipe steel comprising, by wt%, 0.04-0.07% of carbon (C), 0.20-0.30% of silicon (Si), 1.2-1.35% of manganese (Mn), 0.02-0.05% of aluminum (Al), 0.10% or less (excluding 0%) of copper (Cu), 0.15-0.25% of chromium (Cr), 0.02-0.08% of molybdenum (Mo), 0.15-0.25% of nickel (Ni), 0.04-0.05% of niobium (Nb), 0.01-0.018% of titanium (Ti), 0.025%-0.035% of vanadium (V), 0.01% or less (excluding 0%) of phosphorus (P), 0.001% or less (excluding 0%) of sulfur (S), 0.0005% or less (excluding 0%) of boron (B), and the balance of iron (Fe) and inevitable impurities, wherein the relative notch tensile strength (RNTS) according to ASTM G142 is 0.86 or greater.

The invention discloses an edge-crack-free cold-rolled corrosion-resistant steel strip and a production method of the edge-crack-free cold-rolled corrosion-resistant steel strip. The cold-rolled corrosion-resistant steel strip without edge cracks comprises the following components in parts by weight: 0.05 to 0.08 part of C, 0.40 to 0.70 part of Mn, 0.50 to 1.10 parts of P, less than 0.02 part of S, 0.35 to 0.60 part of Cu, 0.015 to 0.050 part of Als, 0.05 to 0.20 part of Sb, 0.0030 to 0.0080 part of B, 0.40 to 0.80 part of Si and 0.040 to 0.060 part of Ti. The production method of the edge-crack-free cold-rolled corrosion-resistant steel strip comprises the following steps: pretreating molten steel; converter steelmaking; secondary refining is carried out, and chemical components in the molten steel are adjusted to target values; the steel ingot is heated to 1180-1250 DEG C, the high-temperature heat preservation time ranges from 80 min to 120 min, the tapping temperature ranges from 1180 DEG C to 1220 DEG C, and hot rolling is conducted; pickling, cold rolling and continuous annealing. According to the invention, a small amount of B, Si and Ti elements are added into the steel to form a cold-rolled corrosion-resistant steel strip component system without edge cracking, and a reasonable production process is matched, so that excellent cold-rolled weather-resistant corrosion-resistant steel without edge cracking can be obtained, and the problems of strip breakage and edge cracking of products caused by edge microcracks during acid rolling are solved.

The application discloses an accident-tolerant nuclear fuel cladding coating and a preparation method and application thereof, and belongs to the technical field of nuclear fuel cladding coating. The coating is a Cr-based binary alloy coating deposited on the surface of a zirconium alloy base, and is selected from Cr-Fe, Cr-V or Cr-Mo alloy coatings, wherein the content of Fe is 3-10 wt%, the content of V is 3-20 wt%, and the content of Mo is 1-5 wt%. The preparation method adopts a magnetron sputtering process, and is realized by controlling parameters such as vacuum degree, temperature, gas pressure, bias voltage and power. Through alloying, the application effectively inhibits the element interdiffusion between the coating and the zirconium alloy base at high temperature, reduces the formation of brittle intermetallic compounds and Kirkendall holes, significantly improves the thermal stability and service life of the coating under accident conditions, meanwhile, the process is mature, the coating quality is high, and the coating is suitable for surface protection of zirconium alloy fuel cladding of nuclear power stations.

The invention relates to a method for recovering valuable metal from lead-antimony alloy by using a vacuum distillation process, and belongs to the technical field of metallurgical engineering. The method comprises the following steps that (1) a raw material lead-antimony alloy is subjected to primary vacuum distillation in a vacuum furnace, in the primary vacuum distillation process, Pb, Sb and Bi elements with low boiling points are volatilized preferentially, and volatile matter lead-antimony-bismuth alloy mainly containing Pb, Sb and Bi and residual copper-silver alloy rich in Cu and Ag are obtained; wherein the raw material lead-antimony alloy mainly comprises the following chemical components (wt%): 38-40% of Sb, 39-42% of Pb, 1-3% of Cu, 5-7% of Bi, 0.5-3% of As and 0.5-3% of Ag; (2) carrying out secondary vacuum distillation on the volatile matter lead-antimony-bismuth alloy in a vacuum furnace to obtain a lead-antimony alloy and a bismuth alloy; wherein the process conditions of the secondary vacuum distillation in the vacuum furnace are as follows: the temperature is kept at 450 DEG C for 10-15 minutes, the temperature is kept at 500 DEG C for 10-15 minutes, the temperature is kept at 550 DEG C for 10-15 minutes, the temperature is kept at 700 DEG C for 3-5 hours, and the vacuum degree is 5-10

The present application relates to a transition metal layer for preventing interfacial element diffusion, a preparation method thereof and a nickel-based alloy / steel assembly method. The preparation method of the transition metal layer for preventing interfacial element diffusion is that raw materials of chromium, molybdenum, niobium, aluminum, titanium and nickel are mixed and melted, and then rapidly cooled and formed by a casting wheel to obtain an amorphous transition metal layer. The assembly method is that the bonding surfaces of a nickel-based alloy and a steel are polished respectively to remove the oxide layers, the transition metal layer is laid on the bonding surface of the steel, the bonding surface of the nickel-based alloy is covered on the transition metal layer, and then the whole assembly is completed. By introducing the intermediate transition metal layer, the element diffusion between the interfaces is inhibited, the actual corrosion resistance thickness of the composite plate cannot be reduced due to element diffusion, and the intermetallic compound at the interface is prevented from being generated, thereby improving the bonding force of the composite plate.

The plating layer has a chemical composition containing, in mass%, more than 10.0% but 60.0% or less of Al, 4.0-15.0% of Mg, 3.5-8.0% of Si, and the balance of Zn and impurities, and in an element distribution curve when qualitative analysis is performed by the GDS method from the surface of the plating layer toward the steel material, the element distribution curve has an element distribution curve in which the element distribution curve has an element distribution curve in which the element distribution curve has an element distribution curve in which the element distribution curve has an element distribution curve in which the element distribution curve has an element distribution curve in which the element distribution curve has an element distribution curve. Tg is the thickness of a region from the surface of the plating layer to a depth position at which Fe strength corresponding to 5% of the maximum strength of Fe is detected, and Tg is the thickness of a region from the surface of the plating layer to the depth position at which the maximum strength of Fe is detected. When Si (surf) is the average value of Si from the surface of the plating layer to Tg / 3, Si (center) is the average value of Si in the range from Tg / 3 to 2Tg / 3 starting from the surface of the plating layer, and Si (dep) is the average value of Si in the range from 2Tg / 3 to Tg starting from the surface of the plating layer, formula (1) is satisfied. Si (surf) lt; si (dep) lt; si (center)... (1)

This invention provides a device and method for magnetic field-assisted plasma modification of laser cladding coatings under ultra-high pressure. A nickel-based alloy substrate is placed in a sealed working chamber. Inert gas is continuously injected into the sealed working chamber to maintain an ultra-high pressure environment. A molten pool is formed by laser irradiation of nickel-based alloy powder deposited on the surface of the substrate. Simultaneously, metal plasma is used as an element dopant in the nickel-based alloy coating. The metal plasma is sprayed onto the surface of the nickel-based alloy substrate, and the plasma-state active element dopant accumulates on the surface of the molten pool under the control of a magnetic field. Under the synergistic effect of the ultra-high pressure environment and the alternating magnetic field, the metal plasma penetrates into the molten pool and reacts with the molten material, resulting in a nickel-based alloy cladding coating with uniform active element doping. This invention achieves effective doping of the active element Hf into the nickel-based alloy coating, improving the coating's high-temperature resistance.

The invention provides a synergistically modified Cu-Ti alloy and a preparation method thereof. The synergistic modified Cu-Ti alloy comprises the following components in percentage by mass: 3.0-3.5 wt% of a Ti element, less than or equal to 0.01 wt% of a B element, less than or equal to 0.01 wt% of a Zr element and the balance of a Cu element, wherein the synergistic modified Cu-Ti alloy comprises a beta '-Cu4Ti precipitated phase with the size of 3 to 5 nm, a beta'-Cu4Ti precipitated phase with the size of 6 to 15 nm and a beta '-Cu4Ti precipitated phase with the size of 16 to 26 nm. The multi-scale precipitation phases jointly act on an alloy matrix, so that the strength, plasticity and conductivity of the synergistically modified Cu-Ti alloy material are remarkably improved.

Provided are a Cr-Ti-N alloy material, a Cr-Ti-N alloy film, a Cr-Ti-N alloy coating, an alloy film product, and a use. The Cr-Ti-N alloy material comprises a Cr element, a Ti element, and an N element. In the Cr-Ti-N alloy material, the atomic ratio of the Cr element, the Ti element, and the N element is x:y:z, wherein 27.8≤x≤62.9, 18.4≤y≤37.0, and 13.8≤z≤35.2. The Cr-Ti-N alloy material has both excellent corrosion resistance and high hardness.

The invention provides a high-strength and high-thermal-conductivity cast magnesium alloy material and a preparation method thereof. The high-strength and high-thermal-conductivity cast magnesium alloy material comprises the following elements in percentage by mass: 4.5-6.0% of Zn element, 0.55-1.65% of La element, 0.5-1.0% of Cu element, less than or equal to 0.2% of Ca element, 0.3-0.6% of Zr element, less than or equal to 0.15% of inevitable impurities and the balance of Mg element, according to the high-strength and high-thermal-conductivity cast magnesium alloy material, the thermal conductivity is 135-152 W / (mK), the tensile strength is 260-290 MPa, the yield strength is 130-155 MPa, and the ductility is 8-15%. The high-strength and high-thermal-conductivity cast magnesium alloy material has high thermal conductivity and mechanical properties, so that the performance requirements of different application fields on high-thermal-conductivity magnesium alloy heat dissipation parts are better met.

A composite cathode material precursor, its preparation method, and its application are disclosed. The composite cathode material precursor comprises an N-doped iron phosphate core and an M-doped iron phosphate coating layer covering the surface of the iron phosphate core. The N element includes at least one selected from Mn, Ni, Co, Cr, V, Mg, Sr, Nb, La, Nd, Ce, and Y, and the M element includes at least one selected from Al, Ti, and Zr. By introducing doping elements N and M into the core and coating layer of the cathode material precursor, respectively, the crystal structure of iron phosphate can be adjusted, improving its conductivity and ion diffusion rate. Furthermore, the doping elements N and M form a synergistic effect in the composite cathode material precursor, comprehensively improving the structural stability, cycle life, ion transport rate, and electrochemical performance of the cathode material by optimizing the crystal nucleus structure, enhancing the stability of the coating layer, and regulating the electronic structure.