466 results about "Solid solution strengthening" patented technology

The invention discloses a formula, a coating and a method of a dual in-situ precipitation reinforced FeCoNiCr-based high-entropy alloy composite material with a low corrosion-wear synergistic effect. The Al-Co-Cr alloy material comprises the following components in atomic percent: 15 to 30 at% of Al, 10 to 25 at% of Co, 10 to 25 at% of Cr, 10 to 25 at% of Fe, 10 to 25 at% of Ni, 20 to 35 at% of Ti and 5 to 15 at% of C, the preparation method comprises the following steps: filling all metal powder and graphene powder into a ball-milling tank, adding grinding balls, filling argon, sealing, and ball-milling, so as to obtain mixed powder in which the surfaces of metal powder particles are uniformly coated with graphene. The high-entropy alloy composite material with high hardness, high wear resistance and high corrosion resistance is obtained by utilizing the solid solution strengthening effect and the multiple in-situ precipitation strengthening effect of micron-scale TiC and nano-scale precipitation B2. The prepared coating is uniform and compact in structure, is metallurgically bonded with a base material, and has excellent corrosion and friction resistance and low corrosion-wear synergistic effect.

The invention belongs to the field of stainless steel. Specifically, the invention relates to soft magnetic stainless steel containing Cr, Cu, Mo, Nb and rare earth elements, and a soft magnetic stainless steel profile and a product prepared from the soft magnetic stainless steel. The Cu element contained in the soft magnetic stainless steel can be separated out to form nano Cu when the soft magnetic stainless steel is subjected to aging treatment, so that the mechanical property of the obtained soft magnetic stainless steel profile can be effectively improved, and the soft magnetic stainless steel profile has excellent low-temperature toughness and soft magnetic property; in addition, microalloy precipitation is optimized through Nb and rare earth element compounding, so that the proper fine grain size is obtained, and the soft magnetic stainless steel profile has excellent low-temperature toughness; and meanwhile, the tensile strength of the soft magnetic stainless steel profile is improved through the solution strengthening effect of Mo, and the corrosion resistance of the soft magnetic stainless steel profile is improved. The soft magnetic stainless steel profile can be effectively applied to electromagnetic valves and related products which serve in low-temperature media and require certain strength, and has good popularization prospects and application value.

The invention relates to the technical field of magnesium alloys, in particular to a high-toughness rare earth-containing magnesium alloy and a preparation method thereof.The high-toughness rare earth-containing magnesium alloy is prepared from, by weight, 3-8 parts of Zn, 1-5 parts of RE, 0.5-3 parts of Al, 0.1-1 part of Mn, 0.05-0.3 part of Zr and the balance Mg; rE is a combination of Y, Nd and La in a mass ratio of (2-3): 1: (0.5-1). Zinc is used as a secondary main element to replace part of aluminum, efficient solid solution strengthening is achieved through high solid solubility of zinc in magnesium, meanwhile, the morphology and distribution of a precipitated phase are regulated through rare earth, a beta-MgZn2 phase is formed, the high-temperature stability is better, balance optimization of strength, toughness and corrosion resistance is achieved, meanwhile, the welding performance of the alloy is improved through combination of Y, Nd, La and Zr, and the welding performance of the alloy is improved. The hot crack tendency is reduced, the brittle phase problem of a traditional high aluminum alloy is avoided, and the corrosion resistance and the machining performance are synergistically improved.

The invention discloses a double-gradient high-temperature-resistant high-entropy alloy wear-resistant layer and an ultrasonic-assisted laser cladding preparation method thereof, and belongs to the technical field of metal material coatings and surface modification. A proper amount of refractory element W with anti-oxidation and solid solution strengthening effects is introduced into a CoCrFeNi high-entropy alloy coating, an ultrasonic-assisted laser cladding process is adopted, the wear-resistant layer with the grain size and the precipitated phase volume fraction in a gradient structure from exterior to interior is prepared, local stress concentration caused by W aggregation in the laser cladding process is improved, and the wear-resistant performance of the CoCrFeNi high-entropy alloy coating is improved. And the metallurgical bonding strength of the cladding layer and the matrix is improved, and the high-temperature friction and wear resistance of the cladding layer is enhanced. The cladding layer is fine and compact in structure, in gradient distribution, good in mechanical property and excellent in high-temperature wear resistance. The method is easy to operate and low in cost, and an effective method is provided for improving highly coordinated regulation of process-structure-performance and preparing the novel high-temperature-resistant high-entropy alloy wear-resistant layer.

The invention provides a method for additive forming of a high-performance Ti2AlNb three-period minimal curved surface lattice structure in a nitrogen atmosphere, and belongs to the technical field of additive manufacturing. Comprising the following steps: step 1) modeling an implicit function of a TPMS configuration: designing a CAD model of the TPMS configuration and exporting the CAD model as an STL file; 2, pretreatment of the Ti2AlNb lattice structure formed through L-PBF, wherein an STL file is subjected to slicing treatment, and technological parameters are set; 3, L-PBF forming of the Ti2AlNb lattice structure is conducted, specifically, in the nitrogen-argon mixed atmosphere, the Ti2AlNb lattice structure is formed through the L-PBF technology; and (4) the TPMS configuration Ti2AlNb lattice structure is subjected to surface treatment. According to the method, the Ti2AlNb lattice structure with the TPMS configuration is designed through implicit function modeling, the Ti2AlNb lattice structure with the TPMS configuration is formed through L-PBF in the nitrogen-argon reaction atmosphere, the problems that in traditional particle strengthening, reinforcements are distributed unevenly, and the solid solution strengthening effect is limited are solved, and good matching of the strength, plasticity and toughness of the lattice structure is achieved.

The invention discloses a nickel-based single-crystal high-temperature alloy with high structure stability and a preparation method thereof, and relates to the technical field of high-temperature alloys. The nickel-based single crystal high-temperature alloy provided by the invention is prepared from the following components in percentage by mass: 5 to 7 percent of Al, 7.5 to 10 percent of Co, 5 to 7 percent of Cr, 0.1 to 0.2 percent of Hf, 0 to 2 percent of Mo, 5.5 to 7.5 percent of Ta, 0 to 1 percent of Ti, 8 to 10 percent of W, 0.02 to 0.05 percent of C, 0.003 to 0.005 percent of B and the balance of Ni. According to the invention, by controlling the ratio of elements and avoiding the addition of Re, the precipitation temperature of a harmful TCP phase is obviously reduced to about 840 DEG C on the basis of maintaining a sufficient solid solution strengthening effect, and the long-term stability of the structure is greatly improved. The high-temperature mechanical property of the alloy provided by the invention reaches the level equivalent to that of a traditional Re-containing second-generation single-crystal alloy and is remarkably superior to that of foreign Re-free single-crystal alloys MD2 and Rene N500, and the nickel-based single-crystal high-temperature alloy with high structure stability successfully realizes the unification of low cost and high performance, and is suitable for industrial production. And a reliable material solution is provided for manufacturing the heavy-duty gas turbine blade with higher market competitiveness.

The invention relates to the technical field of aluminum alloy casting, and discloses a rare earth alloying modified 3102 aluminum alloy semi-solid casting method which comprises the following steps: S1, preparing ingredients: firstly preparing a raw material of a 3102 aluminum alloy and then preparing a rare earth element, S2, smelting: sequentially putting the raw material of the 3102 aluminum alloy into smelting equipment according to a sequence, S3, adding the rare earth element, and S4, casting. After the 3102 aluminum alloy raw material is smelted, S4, preparing semi-solid slurry, namely, cooling and stirring a smelted solution through stirring equipment, and adding a grain refiner while stirring until the smelted solution is formed into the semi-solid slurry, S5, performing die casting or injection molding, injecting the semi-solid slurry into a die casting mold of die casting equipment, and S6, cooling and demolding. And S7, heat treatment is conducted, specifically, the demolded casting is subjected to solution treatment, and a protective atmosphere is added. The yield strength and tensile strength of the alloy are improved through mechanisms such as solid solution strengthening, copper and aluminum can form an intermetallic compound to achieve dispersion strengthening, hardness increasing and wear resistance improving, silicon is beneficial for reducing melt viscosity and improving fluidity, and the alloy body performance is further improved through mixing of multiple materials, and the alloy is suitable for being used in various scenes.

The present application relates to a low-yield ratio 420MPa low-alloy high-strength steel and a preparation method, belonging to the technical field of steel manufacturing. In terms of mass fraction, the chemical composition of the low-alloy high-strength steel includes: C: 0.07% to 0.12%, Si: 0.10% to 0.40%, Mn: 1.60% to 1.80%, P: ≤0.015%, S: ≤0.010%, Alt: 0.020% to 0.060%, Nb: 0.03% to 0.05%, Ti: 0.01% to 0.03%, N≤0.005%, and matrix element Fe. The composition design gives full play to the solid solution strengthening of C and Mn and the fine grain strengthening and precipitation strengthening of Nb and Ti microalloys. At the same time, the continuous full annealing process does not require slow cooling treatment, which improves production efficiency and obtains low-cost, low-yield ratio 420MPa low-alloy high-strength (yield ratio ≤0.8) steel with both strength and excellent plasticity. This type of steel can withstand greater plastic deformation while meeting higher strength requirements without plastic instability, achieving the needs of lightweight automotive industry and excellent stamping integral forming of structural parts, and has broad application prospects.

The invention relates to the field of metal material surface strengthening, in particular to an in-situ reaction multi-element ceramic phase reinforced titanium-based composite coating and a preparation method thereof. The preparation method comprises the steps that titanium alloy powder and B4C powder are mixed, and mixed powder is obtained; the mixed powder is conveyed to a cladding focus under atmosphere protection, reaction gas is introduced, laser cladding is conducted, and the in-situ reaction multi-element ceramic phase reinforced titanium-based composite coating is formed on the surface of the metal sample; the reaction gas is nitrogen; the laser power is 1-2 kW, the scanning speed is 5-20 mm / s, and the multi-pass cladding lap joint rate is 40%-80%. By regulating and controlling the laser cladding process, optimizing the laser power, the scanning speed and the reaction gas flow and utilizing a dispersion strengthening mechanism and a solid solution strengthening mechanism of a ceramic phase generated through in-situ reaction, the hardness and the wear resistance of the composite coating are improved, the problems that a traditional titanium-based coating is low in hardness and poor in wear resistance are effectively solved, and the service life of the coating is prolonged. The method is suitable for surface strengthening of key components in the fields of aerospace, ocean engineering and the like.

The invention provides a friction-resistant high-entropy alloy composite coating and a preparation method thereof, and belongs to the technical field of metal surface modification. A FeCoCrNiMox (x is greater than or equal to 0.18 and less than or equal to 0.25) high-entropy alloy is taken as a main component of composite powder, graphene is taken as an additive phase, and the FeCoCrNiMox high-entropy alloy composite coating is prepared on the surface of a matrix by adopting a laser cladding method. The graphene added in the composite powder can generate carbides in situ under the action of laser cladding, and second phase strengthening, solid solution strengthening and fine grain strengthening are generated, so that the friction resistance of the surface of the matrix is remarkably improved. The preparation method is easy to operate and low in cost, the prepared composite coating is high in bonding strength, good in toughness and plasticity and excellent in friction resistance, the surface performance of equipment can be effectively improved, safe and stable operation of the equipment is guaranteed, the service life of the equipment is prolonged, and maintenance expenditure is reduced.

The invention provides solid solution strengthening type maraging stainless steel for a low-temperature environment and a preparation method, the stainless steel comprises the following component elements in percentage by weight: 10-12% of Cr, 8-10% of Ni, 6-7% of Co, 3-4% of Mo, 0.2-0.3% of Si, 0.15-0.3% of Mn, and a harmful element Clt; 0.023%, Slt; 0.0029%, Plt; 0.0021%, and the balance being Fe and inevitable impurities. According to the design concept of the solid solution strengthening maraging stainless steel alloy used in the low-temperature environment, solid solution strengthening is mainly used for replacing precipitation strengthening, high strength is guaranteed, and meanwhile the situation that a precipitated phase serves as a crack source to damage the low-temperature toughness and low-temperature fatigue performance of a material is avoided. The method mainly comprises the following steps: removing Ti to avoid the generation of a high-density Ni3Ti intermetallic compound precipitated phase, adding Si, Mo and other elements to reduce the precipitation rate of the Laves precipitated phase, and meanwhile, synergistically adding Co and Mo elements to improve the solid solution strengthening amount of the material and ensure the high strength of the material.

The invention discloses a method for improving the quality of a laser cladding refractory high-entropy alloy coating, and belongs to the technical field of alloy coatings. The refractory high-entropy alloy coating is composed of WMoTaNb and hydride of Ti or V, the refractory high-entropy alloy coating is a single BCC phase, and the refractory high-entropy alloy coating is prepared through coaxial powder feeding laser cladding. The laser cladding refractory high-entropy alloy coating prepared through an introduction method (solid solution strengthening and in-situ deoxidation) has excellent wear resistance and high-temperature oxidation resistance, the quality and performance of the refractory high-entropy alloy coating are improved through additional powder, and the microhardness of the section of the refractory high-entropy alloy coating reaches up to 674.52 HV0. 2. The coating can be applied to the fields of aerospace, nuclear reactors and the like.

The invention discloses high-temperature-resistant high-entropy stainless steel and a preparation process and application thereof, and relates to the technical field of stainless steel. The high-temperature-resistant high-entropy stainless steel comprises the following components: 0.03 to 0.15 weight percent of C, 0.08 to 0.30 weight percent of N, less than or equal to 1.0 weight percent of Si, less than or equal to 3.0 weight percent of Mn, less than or equal to 0.015 weight percent of S, less than or equal to 0.035 weight percent of P, 16.0 to 22.0 weight percent of Cr, 9.0 to 14.0 weight percent of Ni, 0.18 to 3.6 weight percent of microalloy elements, 0.04 to 4.0 weight percent of Mo, 0.05 to 0.80 weight percent of Co and 0 to 0.10 weight percent of RE. According to the technical scheme, C, N and microalloy elements such as Ti, Zr, Hf, Ta, V, W and Nb can form nanoscale second-phase precipitates in crystals, the solid solution strengthening and precipitation strengthening effects can be achieved, and the high-temperature strength of the material is remarkably improved.

The invention discloses a heat treatment method for improving the strength and plasticity of SLM formed ODS-RAFM steel, and belongs to the field of additive manufacturing ODS-RAFM steel. The invention relates to a heat treatment method for improving the strength and plasticity of SLM formed ODS-RAFM steel. The heat treatment method comprises the steps that ODS-RAFM steel powder is adopted, and an ODS-RAFM steel part is manufactured through a powder bed melting technology; the obtained ODS-RAFM steel part is sequentially subjected to normalizing heat treatment and carbon distribution heat treatment; normalizing treatment is conducted on the sedimentary-state ODS-RAFM steel, a columnar crystal structure formed in the rapid solidification process is eliminated, and a ferrite and martensite mixed microstructure is obtained; then, carbon distribution heat treatment is adopted, and a transitional carbide precipitated phase is obtained; through dispersion strengthening generated by forming two precipitated phases in a matrix, fine grain strengthening and dislocation strengthening of a quenched structure and solid solution strengthening of part of alloy elements, the strength and plasticity of the ODS-RAFM steel are jointly improved.

The present application relates to a method for predicting the yield strength of a nickel-based polycrystalline high-temperature alloy taking into account overheating, obtaining material parameters of the material at different temperatures; based on the material parameters of the material at the overheating temperature, and according to the solid solution strengthening theory, calculating the yield strength of the material at the first overheating temperature. c The first contribution of the matrix to the yield strength; a measure of the material's initial c The volume fraction and average particle size of the phase are calculated once according to the modified form of the Ashby-Orowan equation c 'The second contribution to the relative yield strength; measure the average grain size of the material at the overheat temperature, and calculate the third contribution of the grain boundary to the yield strength based on the Hall-Petch relationship; construct a yield strength prediction model, and integrate the material parameters of the material to be tested at the overheat temperature, the first c The volume fraction and average particle size of the phase and the average particle size of the grains are input into the yield strength prediction model, and the yield strength of the material to be tested at the overheating temperature to be tested is output.

The invention discloses a nickel-based alloy welding wire and a preparation method and application thereof, and relates to the technical field of alloy welding wires, and the nickel-based alloy welding wire comprises the following element components in percentage by weight: 0.005%-0.05% of C, 0.005%-0.35% of Mn, 0.001%-0.015% of P, 0.001%-0.015% of S, 0.01%-0.4% of Si, 20.5%-24% of Cr, 8.0%-9.6% of Mo, 0.05%-4% of Fe, 3.25%-4.25% of Nb, 0.005%-0.5% of Co, 0.01%-0.35% of Al, 0.01%-0.35% of Ti, 0.001%-0.01% of Ta, 0.001%-0.02% of Cu, 0.12%-0.25% of mixed rare earth elements and the balance of Ni. According to the nickel-based alloy welding wire and the preparation method and application thereof, Ni can form a tough matrix, Co, Cr, Mo and other alloy solid solution strengthening elements, the corrosion resistance of the welding wire is improved, high-temperature oxidation is reduced, and the Co element also improves the thermal stability and manufacturing performance of the welding wire. Precipitation hardening elements such as Nb, Ta, Ti and Al are added, and the rare earth elements Ce and La are added, so that the grain boundary can be purified, and the high-purity nickel-based high-temperature alloy welding wire is obtained.

The invention discloses a design and preparation method of a double-phase titanium alloy, and belongs to the field of titanium alloy materials and powder metallurgy. The double-phase titanium alloy comprises the following components: less than or equal to 0.012% of C, less than or equal to 0.015% of H, less than or equal to 0.06% of N, 0.50-0.70% of O and the balance of Ti and inevitable impurities. According to the method, an HCP-FCC double-phase titanium alloy forming part is obtained by utilizing high-oxygen titanium alloy powder and combining with a laser powder bed fusion (PBF-LB / M) technology for forming, wherein the volume fraction of an FCC phase is gt; the density of the finally obtained double-phase titanium alloy reaches 99.8% or above, the tensile strength is larger than or equal to 1100 MPa, the yield strength is larger than or equal to 1000 MPa, and the ductility is larger than or equal to 20.0%. According to the double-phase titanium alloy, a certain amount of nano FCC phase is induced to be formed through interstitial oxygen solid solution elements, the nano FCC phase and an HCP matrix have a coherent relationship, the Ti-O alloy can be effectively strengthened through the HCP-FCC double-phase structure, and the excellent plasticity is kept. The double-phase titanium alloy is excellent in mechanical property and does not depend on solid solution strengthening, second-phase dispersion strengthening or work hardening ways of expensive rare metals such as V, Mo and Nb, and green, low-carbon and low-cost preparation of the titanium alloy is facilitated.

The invention relates to a nickel-based polycrystalline superalloy yield strength prediction method considering overheating. The method comprises the following steps: acquiring material parameters of a material at different temperatures; calculating a first contribution of a material gamma matrix to the yield strength at a first overheating temperature based on the material parameters of the material at the overheating temperature according to a solid solution strengthening theory; measuring the volume fraction and the average particle size of the primary gamma'phase of the material at the overheating temperature, and calculating the second contribution of the primary gamma 'relative to the yield strength according to the correction form of the Ashby-Orowan equation; the average grain size of grains of the material at the overheating temperature is measured, and third contribution of the grain boundary to the yield strength is calculated according to the Hall-Petch relation; and constructing a yield strength prediction model, inputting the material parameters of the to-be-tested material at the to-be-tested overheating temperature, the volume fraction and the average particle size of the primary gamma'phase and the average particle size of the crystal grains into the yield strength prediction model, and outputting the yield strength of the to-be-tested material at the to-be-tested overheating temperature.

Tungsten powder, molybdenum powder, titanium carbide powder and tungsten-copper composite powder are mixed to obtain mixed powder, the mixed powder is pressed and formed to obtain a formed blank, the formed blank is sintered to obtain a ceramic reinforced tungsten framework, the ceramic reinforced tungsten framework is subjected to copper infiltration treatment, and the tungsten-infiltrated copper material is obtained. Titanium carbide and molybdenum are introduced when the tungsten framework is sintered, the strength of the tungsten framework is effectively improved through the solid solution strengthening effect of molybdenum and the second phase strengthening effect of titanium carbide, then the high-temperature strength of the tungsten infiltrated copper material is remarkably improved, meanwhile, the density of the material can be reduced, and weight reduction of tungsten infiltrated copper is achieved. Besides, in the process of sintering the ceramic reinforced tungsten framework, superfine tungsten-copper composite powder is introduced, the sintering performance of the tungsten framework can be remarkably improved, the subsequent copper infiltration effect can be optimized, and therefore the tungsten infiltrated copper material is uniform in component structure, the ablation resistance of the light ablation-resistant tungsten infiltrated copper material is excellent, and the density is greatly reduced compared with existing tungsten infiltrated copper.

The invention discloses nodular cast iron and a production process, and relates to the technical field of nodular cast iron preparation. The invention discloses a nodular cast iron production process. Carbon steel scrap and recirculated iron are used as main furnace materials for smelting, a spheroidizing agent and a first nucleating agent are added for a spheroidizing reaction, pouring is conducted, stream secondary inoculation is conducted, solidification cooling and heat treatment are conducted, and a casting is formed. The process route of the nodular cast iron production process is different from that of a foreign high-silicon solid solution strengthening process route for improving the elongation rate, pig iron is not adopted, only waste steel and recirculated iron are used as main raw materials, and the prepared nodular cast iron meets the requirements of casting products for high strength and high elongation rate of nodular cast iron at the same time; and no precious alloy is added in the production process, so that the production cost is greatly reduced, and the economic benefit is remarkably improved.

The invention relates to the technical field of alloy powder preparation, and particularly discloses alloy powder for laser surfacing and a preparation method thereof, and the alloy powder for laser surfacing comprises 8-12% of nickel (Ni), 4-6% of chromium (Cr), 2-3% of molybdenum (Mo), 1-2% of boron (B), 10-15% of titanium carbide (TiC), 0.5-1% of yttrium oxide (Y2O3), 0.5-1% of silicon (Si), 0.1-0.3% of carbon (C) and the balance of iron (Fe). Fe is used as a matrix, corrosion-resistant and solution strengthening elements such as Ni, Cr and Mo are accurately matched, a low-content Y2O3 rare earth element and a TiC nano strengthening phase are introduced, Y2O3 effectively inhibits grain coarsening in the surfacing process, the brittleness problem caused by the traditional high rare earth content is avoided, TiC nano particles are evenly dispersed in the matrix and form a composite strengthening structure with a Cr7C3 hard phase, the hardness of a surfacing layer is improved, and the hardness of the surfacing layer is improved. The wear-resistant life is prolonged.

A method for improving the welding performance of an aluminum alloy thick plate comprises the following steps that a Y-shaped groove is formed in an aluminum alloy plate, and the Y-shaped groove is provided with N steps; rectangular pulse wave TIG welding is adopted for conducting backing welding on the truncated edge of the bottom of the Y-shaped groove; carrying out cladding on the side part of the groove by adopting rectangular pulse wave TIG (Tungsten Inert Gas) welding; the groove is subjected to filling welding through direct current TIG welding, and after the step position of each step is completely covered, next filling welding is conducted; by adopting the welding method for welding the thick aluminum alloy plate and adopting a multi-pass welding mode, the effect of solid solution strengthening on a welding line of the last pass is achieved, a large amount of heat input at a time is dispersed into multiple times of input, the effect of reducing the peak temperature of a material is achieved, and therefore the strength and the ductility of a connector are further improved on the whole.

The invention relates to Sn-Bi-In-Ag-Zn high-reliability high-entropy alloy low-temperature solder for advanced packaging and a preparation method of the Sn-Bi-In-Ag-Zn high-reliability high-entropy alloy low-temperature solder, and belongs to the technical field of electronic packaging materials. The solder comprises, by atomic percent, 25%-35% of tin, 25%-35% of bismuth, 25%-35% of indium, 5% of silver and 5%-10% of zinc, and preparation of the solder is achieved in an induction melting mode. Main phases of the Sn-In-Bi-Ag-Zn high-reliability high-entropy alloy low-temperature solder for electronic packaging are the tin-based solid solution and the indium bismuth phase, bismuth and indium atoms are subjected to high solid solution in the tin-based solid solution, and solid solution strengthening of the solder is promoted. The melting point is only 80-90 DEG C, and the warping problem caused by CET mismatching can be effectively reduced due to the extremely low melting point. The low-temperature wettability is good, and the wetting angle is smaller than or equal to 33 degrees when the copper substrate is wetted at 120 DEG C. Meanwhile, inhibition of interface IMC rapid growth can be achieved without a diffusion barrier layer, a thin IMC layer can still be kept under the conditions of long-time and multiple times of backflow, the volume ratio of the IMC in a micro welding spot can be remarkably reduced, the influence of the IMC on the mechanical property and reliability of the welding spot can be reduced, good mechanical property can still be kept after long-time and multiple times of backflow, and the service life of the welding spot can be prolonged. The method is suitable for advanced packaging such as flexible packaging and 3D IC packaging which require low packaging temperature or high thermal reliability.

The invention discloses a high-strength and high-plasticity Ti2AlNb alloy additive preparation method. The high-strength and high-plasticity Ti2AlNb alloy additive preparation method comprises the following steps that firstly, scanning parameters are set; 2, prefabricating a solid sheet layer; 3, in-situ heat treatment; and 4, preparing the component. According to the preparation method, through slicing and layering treatment, by means of a slice layer alternate merging melting scanning mode, overheating and remelting of adjacent slice layers are effectively avoided, and the structure stability and the mechanical property are greatly improved; the in-situ heat treatment is beneficial to exerting the effects of phase boundary strengthening and solid solution strengthening, the metallurgical bonding strength of lamellas can be improved, the structure and performance difference caused by lamellar remelting is solved, the plasticity of the Ti2AlNb alloy is remarkably improved on the premise that the excellent strength of the Ti2AlNb material is kept, the room-temperature tensile strength of the prepared Ti2AlNb alloy is not lower than 1100 MPa, the yield strength is not lower than 990MPa, and the tensile strength of the prepared Ti2AlNb alloy is not lower than 10MPa. The plasticity is not lower than 6%, and the method has a wide application prospect in the field of aerospace equipment.

The invention discloses a solid solution strengthening type difficult-to-deform nickel-based high-temperature alloy strip and a preparation process thereof, and belongs to the technical field of nickel material processing. The solid solution strengthening type difficult-to-deform nickel-based high-temperature alloy strip prepared by the invention comprises the following components in percentage by mass: 0.07 to 0.08 percent of carbon, 0.33 to 0.35 percent of silicon, 0.46 to 0.48 percent of manganese, 21.7 to 22.3 percent of chromium, 0.05 to 0.06 percent of cobalt, 0.34 to 0.36 percent of aluminum, 1.30 to 1.31 percent of molybdenum, 0.26 to 0.27 percent of iron, 13.85 to 13.86 percent of tungsten, 3.23 to 4.40 percent of titanium and the balance of nickel. The preparation method comprises the following steps: melting silicon, manganese, chromium, molybdenum, iron, cobalt, tungsten and nickel in a vacuum induction melting furnace, refining and deoxidizing; after deoxidation, adding carbon, aluminum and titanium under the conditions of argon protection and laser irradiation, stirring, discharging, casting, solidifying and homogenizing; and then cogging forging is carried out, after high-temperature rolling is carried out under the electric pulse condition, first-time solid solution heat treatment, acid pickling, cold rolling annealing and finished product heat treatment are sequentially carried out, and the solid solution strengthening type difficult-to-deform nickel-based high-temperature alloy strip is obtained.

The invention provides a medical biological rare earth magnesium alloy material. The medical biological rare earth magnesium alloy material comprises magnesium, gadolinium, zinc, zirconium, dysprosium and scandium. According to the rare earth magnesium alloy material provided by the invention, different contents of rare earth gadolinium, dysprosium, scandium, zinc and zirconium are added to improve the casting performance and the processing performance of a melt, and the alloy structure is improved through solid solution strengthening, dispersion strengthening and grain refinement effects, so that the strength and the ductility are improved; meanwhile, the selection design of the alloy elements strictly conforms to the limitation of biotoxicity, and the biological activity of the alloy elements can not be influenced, so that excellent mechanical properties and processability are obtained while good biocompatibility is kept, and the alloy elements play roles in accelerating osteogenesis and promoting bone tissue growth while playing a fixing role; the non-toxicity, the degradability and the high therapeutic property are really realized.

The invention relates to the technical field of aluminum matrix composites, in particular to a double-layer composite wire and a method for manufacturing a high-performance aluminum matrix composite through electromagnetic field regulation and control additive manufacturing of the double-layer composite wire. (2) the additive manufacturing process is regulated and controlled through a three-axis electromagnetic field; and (3) carrying out post-treatment on the prepared aluminum-based composite material. The Al-Ti-B alloy at the core provides an ideal reaction environment for in-situ generation of a TiB2 nanophase, and the Al-Cu-Mg alloy at the shell provides solid solution strengthening elements for a matrix. The layered design not only realizes the spatial separation of the reinforcing phase and the solid solution strengthening element, but also creates conditions for the synergistic effect of two strengthening mechanisms. And secondly, a powerful tool is provided for accurate control over behaviors of the molten pool through introduction of the three-axis electromagnetic field regulation and control technology. The magnetic field intensity and the frequency are independently regulated in the x direction, the y direction and the z direction, and multi-dimensional regulation of flowing, heat transfer and solidification behaviors of the molten pool can be achieved.

The invention relates to a high-strength and high-conductivity Cu-Zr alloy material added with trace elements and a preparation method of the high-strength and high-conductivity Cu-Zr alloy material, and belongs to the technical field of copper alloy preparation and processing. The copper alloy is prepared mainly through a combined deformation heat treatment process, the prepared copper alloy has high strength and excellent conductivity and plasticity, the heat stability of the alloy is improved, and the copper alloy can be used as a lead frame, a rectifier device, a high-temperature-resistant copper alloy material, a high-temperature-resistant copper alloy material, a high-temperature-resistant copper alloy material, a high-temperature-resistant copper alloy material, a high-temperature-resistant copper alloy material, a high-temperature-resistant copper alloy material and a high-temperature-resistant copper alloy material. The method is applied to advanced fields such as rail transit and electrical electronics.

The invention relates to the technical field of bearing manufacturing, and provides a high-strength and high-toughness double-peak tempering heat treatment method for aero-engine high-nitrogen bearing steel, which comprises the following steps: a steel ingot of the high-nitrogen bearing steel is subjected to cold rolling after being forged and annealed, the rolling speed is less than 10m / min, and the rolling deformation is 30-40%; after a rolled workpiece is austenitized, the workpiece is sequentially subjected to first-time deep cooling (-196 DEG C to-80 DEG C), pre-strengthening tempering (160-180 DEG C), second-time deep cooling (-196 DEG C to-80 DEG C) and final strengthening tempering (450-500 DEG C), and the high-strength and high-toughness aero-engine high-nitrogen bearing steel is obtained. According to the high-strength, high-toughness and high-corrosion-resistance forming and manufacturing method, the high-strength, high-toughness and high-corrosion-resistance requirements of a bearing under the extreme working condition of an aero-engine are met, the tempering technology of'double-peak tempering 'formed by cold rolling forming in advance, pre-strengthening tempering and final strengthening tempering is organically combined, a double-strength structure of solution strengthening and precipitation strengthening is obtained, and the high-strength, high-toughness and high-corrosion-resistance forming and manufacturing method is achieved.

The present invention belongs to the technical field of alloys. Disclosed are a nickel-based high-temperature alloy with low cracking sensitivity coefficients, a manufacturing method therefor and the use thereof. The nickel-based high-temperature alloy comprises: 16.73-17.40% of Cr, 15.60-16.70% of Co, 0.00-0.01% of Mo, 5.90-6.30% of W, 1.80-2.12% of Ta, 1.40-1.62% of Nb, 1.90-2.10% of Al, 3.40-3.60% of Ti, 0.12-0.14% of C, 0.003-0.007% of B, 0.005-0.009% of Zr and the balance of Ni and inevitable impurity elements. The present invention obtains the nickel-based high-temperature alloy with low cracking sensitivity coefficients, high aluminum and titanium content, high Co+W solid solution strengthening element content and low oxygen content, and turbine blades made from the alloy by means of the additive manufacturing process exhibit high density, high creep strength and low oxygen content, thereby effectively meeting the technical requirements of high-power gas turbines.