219 results about "Intermetallic" patented technology

The invention provides a core-shell structure magnetic abrasive and a preparation method thereof, and belongs to the technical field of magnetic abrasive preparation. According to the core-shell structure magnetic abrasive provided by the invention, through the arrangement of the core-shell structure, the magnetic abrasive has regular morphology and size, and irregular morphology and uncontrollable particle size caused by later processing are avoided; the transition bonding layer is arranged on the surface of the ferromagnet core, so that the hard phase is uniformly distributed on the surface of the ferromagnet, and the problem of uneven distribution of the hard phase is avoided; the transition bonding layer is connected with the hard phase through metallurgical bonding, the ferromagnet and the hard phase are tightly connected together, a magnetic channel is established through the formed intermetallic compound interface diffusion layer, the magnetic dilution effect of the hard phase is weakened, and the magnetic performance of the magnetic abrasive is remarkably enhanced.

Particular embodiments may provide an anode material, comprising a compound of formula Li2—X—Y, wherein: X and Y are each independently a metal atom or a metalloid atom; the anode material has a discharge potential of less than about 0.4 V vs. Li / Li+; and the molar ratio of Li:X:Y is 2:1:1.

The invention discloses an anti-oxidation packaging material for hot rolling of thermoelectric materials and a preparation method of the anti-oxidation packaging material, and relates to the technical field of new materials. The packaging material is of a three-layer composite tubular structure and sequentially comprises, from inside to outside, an anti-oxidation barrier layer which is a composite material with an Fe-Al intermetallic compound as a matrix and Y2O3 particles dispersed and distributed; the transition layer is a Ni-Cr-Fe-Mn-C series solid solution alloy with Ni as a matrix; and the structure supporting layer is made of microalloyed low-carbon bainite steel. The layers are metallurgically bonded through hot isostatic pressing, and then the hollow composite pipe is manufactured through cold drawing. The packaging material has excellent high-temperature oxidation resistance, good plastic deformation capacity and structural strength, can effectively isolate oxygen, coordinate strain and maintain overall integrity in the high-temperature hot rolling process, is suitable for protection and densification of Bi2Te3-based, PbTe-based and SiGe-based thermoelectric materials and the like, and remarkably improves thermoelectric performance and production consistency of the thermoelectric materials.

The invention belongs to the technical field of hydrogen fuel cell catalysis, and particularly relates to a self-supporting film based on intermetallic PtCu nanowire clusters and a preparation method and application thereof. The preparation method of the intermetallic PtCu nanowire cluster self-supporting thin film comprises the following steps: preparing a precursor solution, preparing a PtCu alloy nanowire cluster catalyst, preparing a self-supporting PtCu nanowire cluster thin film, and preparing the self-supporting PtCu nanowire cluster thin film coated with a SiO2 protective layer on the surface (soaking the self-supporting PtCu nanowire cluster thin film in a solution of tetraethoxysilane and formic acid, and drying the self-supporting PtCu nanowire cluster thin film to obtain the intermetallic PtCu nanowire cluster self-supporting thin film. The self-supporting PtCu nanowire cluster film coated with the SiO2 protective layer on the surface is subjected to heat treatment in a reducing atmosphere, and the heat treatment temperature is 400-800 DEG C. The self-supporting film provided by the invention is high in mechanical strength and mild in method condition, and the output power of the fuel cell is improved.

The invention provides a surface modification method of intermetallic compound powder. The surface modification method comprises the following steps: S1) pretreating the intermetallic compound powder; s2) performing high-frequency thermal plasma treatment on the intermetallic compound powder obtained in the step S1), and cooling; and S3) carrying out jet milling treatment on the intermetallic compound powder obtained in the step S2). The invention further provides application of the intermetallic compound powder subjected to surface modification in additive manufacturing. According to the surface modification method provided by the invention, micro powder of the powder is eliminated through high-frequency thermal plasma treatment, meanwhile, the sphericity degree of the powder is improved, high-speed collision and friction are generated among the powder and the surface roughness of the powder is increased by continuously combining jet milling treatment, so that the friction force of mutual contact among the powder is increased; and the powder blowing phenomenon in the electron beam selective melting forming process is inhibited, and the intermetallic compound powder which is difficult to melt and machine and suitable for the electron beam selective melting forming additive manufacturing technology is obtained.

The present invention provides a method for preparing an AgCuTi active solder, relating to the technical field of brazing materials. The preparation method comprises the following steps: pretreating a titanium foil, sequentially electroplating the surface with silver and copper, and diffusing the electroplated titanium foil in a vacuum environment at 600-700°C for 24 hours to obtain the AgCuTi solder. The method provided by the present invention can easily and conveniently prepare sheet- and strip-shaped AgCuTi active solders, and the active solders are less susceptible to the presence of CuTi intermetallic compounds while exhibiting good performance.

The invention relates to the technical field of dissimilar material connection, in particular to a method for regulating and controlling molybdenum steel brazed joint intermetallic compounds based on transition elements. According to the technical scheme, the method comprises the following steps that a transition element coating is deposited on the surface of a molybdenum matrix, transition elements are selected from one or more of Ti, V, Nb, Zr, Hf and Ta, and the molybdenum matrix and a steel matrix are brazed through boron-containing Ni-based brazing filler metal; in the brazing process, the transition element and the boron element preferentially react to generate a transition element boride, and therefore generation of MoNiBintermetallic compounds is inhibited. According to the method, the transition element coating is introduced, a brazing interface reaction path is actively intervened and reconstructed from the thermodynamic angle, and the problem of continuous generation of the brittle MoNiBintermetallic compound in the molybdenum / steel brazing joint is fundamentally solved.

The invention discloses a high-entropy alloy foil strip and a laser welding method of a titanium alloy and an aluminum alloy, and belongs to the technical field of dissimilar metal laser welding machining, the high-entropy alloy foil strip is used as a dissimilar metal welding middle layer, and the chemical formula of the high-entropy alloy foil strip is TiaFe2aCo2aNi2aCub; wherein a and b both represent atomic proportionality coefficients, b is a continuous adjustable real number parameter in a [1, 3] interval, and 7a + b = 10. The high-entropy alloy foil strip system has uniqueness in element selection, the proportion of Ti, Fe, Co, Ni and Cu is optimized by combining a Miema model and the metallurgical compatibility of base metal, a stable FCC solid solution can be formed in the welding process, the wettability and the structure stability can be improved, and therefore it is ensured that the performance of a welded joint is improved. A high-entropy alloy foil strip middle layer is introduced between two base materials, the high-entropy effect and the hysteresis diffusion effect are utilized, chemical components of a joint are regulated and controlled, generation of brittle Ti-Al intermetallic compounds in a weld joint is restrained, and therefore the mechanical property of the welded joint is improved.

The invention provides a titanium-steel cylindrical part construction method, which belongs to the technical field of metal material welding and comprises the steps of sample pretreatment, sample placement and diffusion welding. According to the method, appropriate parameters such as diffusion welding temperature, time and pressure are selected, the axial load of diffusion bonding equipment is applied to the upper end of the titanium alloy cylindrical part, flowing deformation of ceramic particles is restrained through the outermost hard alloy or graphite jacket, the axial load is converted into radial load through the fluidity of the ceramic particles, and the axial load is applied to the upper end of the titanium alloy cylindrical part. The radial load acts on a laminated structure interface through the titanium alloy layer from outside to inside, a transition solid solution can be formed at the structure interface, good interface combination is achieved, meanwhile, mutual diffusion of titanium and iron elements is prevented through the existence of the middle layer, and formation of brittle ferrotitanium intermetallic compounds is avoided. The welding joint obtained through the method has the advantages of being good in combination, free of pores and cracks and the like.

The invention relates to the technical field of magnesium alloy smelting, in particular to a Mg-Nd-Gd-Sb heat-resistant magnesium alloy and a preparation method thereof. According to the high-strength heat-resistant magnesium alloy containing rare earth Nd and Gd and the element Sb, on the basis that precipitation strengthening of rare earth intermetallic compounds containing Nd and Gd is used as a main strengthening mechanism, the Sb element is introduced to form a Mg3Sb2 high-temperature strengthening phase with high stability, on the premise that the total amount of rare earth is not greatly increased, the room-temperature and high-temperature strength performance indexes are improved to different degrees, and the high-strength heat-resistant magnesium alloy containing rare earth Nd and Gd is obtained. And good formability is maintained, and engineering application is easy to realize. The high-strength heat-resistant magnesium alloy containing the rare earth Nd, the rare earth Gd and the element Sb is excellent in high-temperature mechanical property, the tensile strength, the yield strength and the ductility of a heat treatment state material after casting at the temperature of 300 DEG C reach 230-245 MPa, 145-150 MPa and 5-7% correspondingly, and the requirements for the mechanical property of a light structural material in a high-temperature environment in the current fields of aerospace, rail transit and the like can be met.

The invention belongs to the field of Ti-Al intermetallic compound microstructure control, and particularly relates to a heat treatment method for preparing a uniform structure of a Ti3Al-based alloy. Firstly, Ti3Al-based alloy is subjected to heat preservation in a beta / B2 single-phase region or an alpha < 2 + > beta / B2 two-phase region, then cooling is conducted in a specific cooling speed region to obtain a subboundary-like net-shaped intermediate-state structure, then the Ti3Al-based alloy is subjected to heat preservation in the alpha < 2 + > beta / B2 two-phase region or an alpha < 2 + > O + beta / B2 three-phase region, and a uniform and low-length-width-ratio alpha < 2 > / O phase and small-size alpha < 2 > / O phase clustered microscopic structure is obtained. The method is simple and easy to implement and low in cost, the uniform alpha2 / O phase with the low length-width ratio and the small-size alpha2 / O phase cluster structure are obtained through the special subboundary-like net-shaped intermediate-state structure and subsequent heat treatment, and the problem that the alpha2 / O phase with the low length-width ratio and the small-size alpha2 / O phase cluster structure can be obtained only through deformation or complex heat treatment is solved.

The invention provides a preparation method of a cobalt-based intermetallic carbide material and application of the cobalt-based intermetallic carbide material in a preparation method of an electrocatalytic nitrate reduction electrolytic tank or a zinc-nitrate battery. The preparation method of the cobalt-based intermetallic carbide material comprises the following steps that cobalt chloride hexahydrate, indium chloride tetrahydrate, dicyandiamide and ketjen black are ground and mixed and then put into a tubular furnace for thermal annealing reduction, and the cobalt-based intermetallic carbide material is obtained. According to the method, cobalt-based intermetallic carbide material Co3InC0.75 powder is prepared into slurry, the slurry is dropped on carbon paper to be used for an electro-catalysis reaction, the material strengthens nitrate adsorption and water decomposition and inhibits a hydrogen evolution reaction, and therefore the performance of electro-catalysis of nitrate reduction to produce ammonia is improved.

The application discloses a brazing method of magnesium / aluminum dissimilar metals, which comprises the following steps: pre-electroplating nickel on a magnesium alloy base material, connecting the prepared magnesium alloy with a nickel plating layer and an aluminum alloy by using an ultrasonic-assisted brazing method, and using a brazing filler metal SAC305. The method prevents the generation of Mg-Sn intermetallic compounds (IMCs) in the process of magnesium / aluminum dissimilar metal low-temperature brazing using a Sn-based brazing filler metal. After welding, the position of the original nickel plating layer is changed into a Cu-Ni solid solution, and no large block-shaped Mg2Sn IMC is found in the brazing seam. Compared with a joint without a plating layer, the shear strength of the magnesium / aluminum dissimilar metal brazing joint based on the nickel plating layer is greatly improved, and the joint strength is strengthened by the diffusion of the nickel element into the brazing seam in the welding process. In addition, the corrosion resistance of the magnesium alloy can be improved by plating nickel on the surface of the magnesium alloy, and the service life of the magnesium / aluminum component is prolonged.

The present invention discloses a zinc-aluminum-magnesium coated steel sheet based on hot-dip plating and hot-forming technology, and its preparation method and application. The steel sheet is obtained by hot-dip plating and austenitizing and stamping under high-temperature conditions. The dipping solution for hot-dip plating is a Zn-Al-Mg dipping solution, and its composition is located in the zinc-rich corner of the Zn-Al-Mg ternary phase diagram, and the mass percentage meets the following requirements: the Zn content is 85-95 wt.%, the Al content is 4.5-8.5 wt.%, and the Mg content is 1-4.5 wt.%. After hot-dip plating, the steel sheet becomes a zinc-aluminum-magnesium coated steel sheet, which is composed of a steel sheet, a zinc-aluminum-magnesium coating-2, and an intermediate compound layer. Among them, the zinc-aluminum-magnesium coating contains Zn, Al, and MgZn2 phases; the zinc-aluminum-magnesium coating contains a Zn-Al two-phase eutectic and a Zn-Al-MgZn2 three-phase eutectic; the intermediate compound layer is an Fe-Al or Fe-Al-Zn intermetallic compound. After austenitizing, the zinc-aluminum-magnesium coated steel sheet becomes a steel sheet to be stamped, which is composed of a steel sheet and a zinc-aluminum-magnesium coating-3. The zinc-aluminum-magnesium coating-3 contains an α-Fe(Zn,Al) phase. As a corrosion-resistant material, the corrosion current density I corr is (1.20-1.68)×10 ‑5 A / cm 2 ; as a high-temperature mechanical material, the elongation is 38-54%.

The present invention belongs to the technical field of cemented carbide manufacturing, and discloses a cemented carbide with a cobalt-aluminum intermetallic compound CoAl as a bonding phase and a preparation method thereof. The cemented carbide is composed of a cobalt-aluminum intermetallic compound CoAl as a bonding phase and a hard phase WC. When the molar ratio of the added Co element and the Al element is 1:1 or 3:2, respectively, a cemented carbide with the intermetallic compound CoAl as a bonding phase is obtained. The mixed powder is evenly mixed by ball milling, and then spark plasma sintering is performed to finally obtain a dense cemented carbide with the cobalt-aluminum intermetallic compound CoAl as a bonding phase. The material composition of the present invention is reasonably designed, the preparation process is simple and controllable, the production cost is low, and large-scale industrial production and application are possible.

The invention discloses a friction stir welding method for aluminum-magnesium dissimilar alloy of a medium plate. Firstly, an aluminum alloy plate and a magnesium alloy plate which are equal in thickness (h) are selected, a protruding part is machined in the middle of a to-be-welded interface of the magnesium alloy plate, and meanwhile a concave part matched with the protruding part is prepared in the corresponding position of the aluminum alloy plate; then, the convex part of the magnesium alloy plate is accurately embedded into the concave part of the aluminum alloy plate to form a mechanical embedding structure; and finally, a stirring head is adopted for conducting friction stir welding along the path that the center line of the protruding part deviates towards the aluminum alloy plate side. According to the method, a material flowing track is forcibly regulated and controlled through geometric interlocking design, generation of brittle intermetallic compounds (IMC) is effectively inhibited in combination with an offset welding strategy, and the structural integrity and the mechanical property uniformity of the joint in the thickness direction are ensured.

Disclosed is a metal particle that includes a basal phase that contains Sn, an Sn—Cu alloy and Sb; and an intermetallic compound crystal that contains Sn, Cu, Ni, Ge, Si and Ti, included in the basal phase, the metal particle has a chemical composition given by 0.7 to 15% by mass of Cu, 0.1 to 5% by mass of Ni, 0.1 to 14% by mass of Sb, 0.001 to 0.1% by mass of Ge, 0.001 to 0.1% by mass of Si, 0.001 to 0.1% by mass of Ti, and the balance of Sn; the basal phase has a chemical composition given by 85 to 99.9% by mass of Sn, 5% by mass or less of Cu, and 0.1 to 14% by mass of Sb; and, at least parts of the basal phase and the intermetallic compound crystal form an endotaxial joint.

The embodiment of the present application relates to a kind of copper intermetallic compound porous materials and its preparation method and application, wherein, preparation method includes: metal Mg, Zn, Cu, M is mixed, is handled by induction smelting, and MgZnCuM alloy ingot is obtained;MgZnCuM alloy ingot is treated by spinning, and MgZnCuM precursor is obtained;MgZnCuM precursor is placed in gas phase de-alloying system and is treated by first vacuum heat treatment, and copper intermetallic compound porous material MgCuM is obtained;MgCuM has double continuous structure.The preparation method is simple and easy to operate, pore size is adjustable, and pore distribution is uniform, and the preparation process is environment-friendly and pollution-free.

The present invention discloses an embedded storage structure, a resistive random access memory and a method for preparing the same, belonging to the field of semiconductors. The present invention first prepares a first intermetallic dielectric layer on an interlayer dielectric layer of a first semiconductor structure; prepares a first metal circuit and a first electrode plate in the first intermetallic dielectric layer; continues to prepare a first barrier layer; uses an etching process to open the first intermetallic dielectric in an area on one side of the first electrode plate to form a first groove; deposits resistive random access material and conductive metal material in sequence; flattens and rests on the first barrier layer to obtain an embedded storage structure. The present invention prepares a resistive random access memory unit that changes the orientation of the electrode plate through a completely new process sequence, and prepares a resistive random access memory using this structure, making the resistive random access memory compact as a whole and compatible with the MOS process in the prior art. After simulation verification, the present invention has strong reliability and operability, and has a high production yield.

This invention relates to transition layer materials and welding processes for welding dissimilar steel and aluminum materials, belonging to the field of welding technology. The transition layer material for welding dissimilar steel and aluminum materials of this invention comprises a copper layer, a copper alloy layer, and a zinc alloy layer arranged sequentially; the copper layer is adjacent to the steel base material, and the zinc alloy layer is adjacent to the aluminum base material; the copper content in the copper alloy layer is 62.0%-64.0%; the zinc content in the zinc alloy layer is 89.0%-91.0%; the mass ratio of the copper layer, copper alloy layer, and zinc alloy layer is (0.9-1.1):(2.3-2.7):(1.8-2.2). By sequentially setting the copper layer, copper alloy layer, and zinc alloy layer between the steel base material and the aluminum base material, a gradual transition from the steel base material to the aluminum base material is achieved, effectively avoiding the formation of brittle Fe-Al intermetallic compounds during direct welding, and enhancing the mechanical properties and durability of the welded joint.

The invention belongs to the field of preparation of high-performance metal structure materials, and particularly relates to a method for preparing a Ti2AlNb alloy based on spherical titanium alloy powder. Commercial spherical titanium alloy pre-alloyed powder containing at least two elements of Al, Zr, Mo and V and pure niobium powder are selected as base materials, the spherical powder, the pure niobium powder and pure aluminum powder are evenly mixed according to the designed atomic proportion, a densification path of vacuum sintering or spark plasma sintering after cold isostatic pressing is adopted for preparing a consumable electrode blank, and the consumable electrode blank is prepared into a self-consumable electrode. And finally, a Ti2AlNb-based alloy cast ingot is obtained through vacuum self-consuming electric arc melting. According to the invention, not only is the technical bottleneck of inevitable gravity segregation in the smelting process of the Ti-Al intermetallic compound with high Nb content broken through, but also a brand new material preparation technical route with low cost, high performance and high stability is constructed; an industrialization feasible scheme is provided for solving the bottleneck problem of short-time high-temperature light structural materials in the aerospace field.

The present invention belongs to the technical field of porous materials, and discloses a Ni-Si intermetallic compound porous material and its preparation method and electrocatalytic application. The Ni-Si intermetallic compound porous material of the present invention is doped with Mo, Fe, Mn, Ti, W, Co, Cu or Cr elements, and comprises Ni: 30-80at.%, Si: 20-70at.%, Mo: 0-10at.%, Fe: 0-10at.%, Mn: 0-10at.%, Ti: 0-10at.%, W: 0-10at.%, Co: 0-10at.%, Cu: 0-10at.%, Cr: 0-10at.%. This kind of intermetallic compound porous material can be directly used in electrolysis of water, without the need to use carbon cloth, nickel foam or binder, and in order to further improve electrocatalytic activity, the present invention obtains more active sites and better catalytic activity by combining doping with a three-dimensional porous structure.

The invention discloses a post-treatment method for improving plasticity of a laser directed energy deposition Ti2AlNb intermetallic compound, and relates to a post-treatment method of an intermetallic compound. The problems that an existing Ti2AlNb alloy prepared through laser directional energy deposition is poor in plasticity, and traditional solid solution heat treatment is long in time are solved. According to the method, 340-420 A high-energy pulse current is selected for pulse current treatment, the interior of the alloy is rapidly heated after 12-18 s of instantaneous treatment, and the internal microstructure of the alloy is regulated and controlled through the heat effect and the non-heat effect of the pulse current; in the process that high-energy pulse current is introduced into the alloy, electron wind acts on atoms to promote element diffusion and phase change, so that a fine needle-shaped O phase is converted into a matrix phase within 12-18 s, dislocation motion is promoted, the internal stress in the alloy is released, the internal deformation resistance of the alloy is reduced, and the mechanical property of the alloy is improved. And the room-temperature ductility of the alloy is improved to 16.5% from 2% under the condition that the room-temperature tensile strength is not reduced.

The application provides a preparation method of an isotropic Ti2AlNb / TiAl-based interpenetrating composite material and belongs to the technical field of intermetallic compound-based composite materials. First, a plurality of Ti2AlNb reinforcing body skeletons in a TPMS configuration are designed by using a hidden function modeling; then, anisotropy of the TPMS configuration is studied by using finite element simulation; secondly, the Ti2AlNb reinforcing body skeleton in the TPMS configuration is prepared by using a selective laser melting process SLM; finally, the Ti2AlNb / TiAl-based interpenetrating composite material in the TPMS configuration is prepared by vacuum hot pressing sintering HPS. Thus, the strong anisotropy of a traditional fiber reinforced composite material in mechanical properties is avoided, good matching of the strength, plasticity and toughness of the composite material is realized, and a new idea and solution are provided for breaking through the application bottleneck of a TiAl in a thermal end part of a space power system.

The invention discloses a high-strength and high-plasticity martensite Ti-Al-Zr-Cr-Cu titanium alloy and a preparation method, and belongs to the technical field of high-performance alloy materials, the titanium alloy comprises, by mass, about 5.2% of Al, 4.5% of Zr, 2.8% of Cr, 2% of Cu, and the balance Ti and inevitable impurity elements. In the preparation process of the titanium alloy, a large number of dislocations generated in the hot machining (hot rolling) process are utilized, dense coherent nanometer martensite is mediated to be formed through rapid water cooling and oil cooling processes, martensite partial decomposition and nanometer intermetallic compound Ti2Cu precipitation are induced through simple aging treatment, and the titanium alloy is obtained. And more interfaces are introduced to hinder dislocation free sliding, so that the strength and plasticity of the alloy are synergistically improved.

The invention provides a method for designing a Reuleaux biangular tool and electrolytically machining a grid wallboard, and belongs to the technical field of electrolytic machining. In the process of electrolytic machining of a grid wall plate through a Reuleaux two-angle tool, the current density of the surface of a workpiece is in an intermittent state or a machining state, localized removal of materials is achieved, and the machining method comprises the following steps that according to the characteristics of a Reuleaux triangle fixed-width curve, the Reuleaux two-angle oval cathode tool is designed; the center of the tool is controlled to do regular eccentric rotation motion through planetary gear transmission, and the motion trail of the cathode tool forms a regular triangle localized electric field; a new intermittent electrolytic machining mode of the grid wall plate is formed along with the periodic turning-in / out of the machining area of the tool machining blade; the machining mode is beneficial to rapid and uniform crushing of a passivation film, and is suitable for precise machining of materials such as easily passivated titanium alloys and titanium-aluminum intermetallic compounds; electrolyte updating is facilitated, and temperature rise, bubbles and product aggregation are avoided; and the overcut phenomenon is avoided. By means of the method, high-quality electrolytic machining of the grid wall plate can be achieved.

The application discloses a size-controllable carbon-supported PtZn intermetallic compound electrocatalyst and a preparation method and application thereof, and belongs to the technical field of nanometer catalysts and preparation thereof.The electrocatalyst is a long-range ordered face-centered tetragonal structure PtZn intermetallic compound, Pt and Zn are arranged alternately in atomic layers, and the atomic ratio of Pt to Zn is close to 1:1; the long-range ordered structure not only makes the regulation of transition metals fully play, but also makes the chemical bond formed by Pt atoms more stable transition metal atoms, so that the transition metal atoms are not easy to be dissolved under acidic conditions, and the catalytic activity and stability are further improved. In the application, the size-controllable carbon-supported PtZn intermetallic compound electrocatalyst can be obtained without introducing a surfactant and a protective agent, and the preparation method has the advantages of simplicity and easy implementation.

The invention belongs to the field of intermetallic compounds, and particularly discloses a Ti-Al-Mn intermetallic compound and a preparation method and application thereof. According to the invention, Zr with a specific content is introduced into a Ti-Al-Mn system with a specific content composition to form the Ti-Al-Mn intermetallic compound, the Ti-Al-Mn intermetallic compound can be used for preparing workpieces with high temperature resistance, and the preparation method is simple. The Ti-Al-Mn intermetallic compound provided by the invention has excellent oxidation resistance and hardness in a high-temperature state; meanwhile, the invention further provides a preparation method of the Ti-Al-Mn series intermetallic compound, the process is simple, and the production cost can be reduced while the Ti-Al-Mn series intermetallic compound with excellent performance is prepared; in addition, the Ti-Al-Mn intermetallic compound provided by the invention can also be applied to a workpiece, so that the stable and reliable performance of the workpiece under a high-temperature working condition is ensured.

A method of processing a powder starting material (21) including a plurality of particles to form a product, the product having a plurality of grains with a nominal grain size, the method comprising: Atomizing a base material to produce the powder material; Heat treating a powder material at a temperature in the range up to 1400°C for a period of up to 100 hours to form the powder starting material (21), wherein the plurality of particles of the powder starting material (21) includes a collection of phase particles arranged in a matrix material, the collection of phase particles having a first nominal size distribution, wherein heat treating the powder material to form the powder starting material (21) comprises nucleating the phase within the powder material and growing a phase within the powder material to form the collection of phase particles; wherein the matrix material comprises one of the following: an Al-based alloy, a Co-based alloy, an Fe-based alloy, a Ni-based alloy and a Ti-based alloy, wherein the collection of phase particles comprises one or more of the following: carbides, borides, nitrides, oxides, intermetallics and topographically close packed (TCP) phases, Forming a solid component (28) from the powder starting material (21) in an additive manufacturing process; and Producing the article of manufacture from the solid component (28), wherein the first nominal size distribution of the collection of phase particles is such that at least a portion of the collection of phase particles persists throughout the additive manufacturing process and is present as a processed collection of phase particles in the solid component (28), and wherein the processed collection of phase particles has a second nominal size distribution effective to produce the nominal grain size of the article of manufacture.

This invention discloses an antioxidant encapsulation material for hot rolling of thermoelectric materials and its preparation method, relating to the field of new materials technology. The encapsulation material is a three-layer composite tubular structure, comprising, from the inside out: an antioxidant barrier layer, a composite material with Fe-Al intermetallic compounds as the matrix and dispersed Y2O3 particles; a transition layer, a Ni-Cr-Fe-Mn-C solid solution alloy with Ni as the matrix; and a structural support layer, a micro-alloyed low-carbon bainitic steel. Each layer is metallurgically bonded by hot isostatic pressing, and then cold-drawn to form a hollow composite tube. This encapsulation material exhibits excellent high-temperature oxidation resistance, good plastic deformation capacity, and structural strength. It can effectively isolate oxygen, coordinate strain, and maintain overall integrity during high-temperature hot rolling. It is suitable for the protection and densification of Bi2Te3-based, PbTe-based, and SiGe-based thermoelectric materials, significantly improving the thermoelectric performance and production consistency of thermoelectric materials.