16 results about "Supersaturated solid solution" patented technology

This invention relates to the field of alloy forming technology, specifically to a method for preparing Ti-Al medium-entropy alloys based on selective laser melting. The method includes preparing raw material rods, gas atomization powder preparation, 3D modeling, preheating and forming the matrix, powder spreading and leveling, 3D printing pretreatment, pre-powder spreading, and laser printing. This method features high melting rate and high solidification rate, forming unique microstructures such as ultrafine grain structure, metastable phases, and supersaturated solid solutions. By combining alloy composition design, gas atomization powder preparation, and selective laser melting, the resulting parts possess excellent comprehensive mechanical properties and can be used to prepare complex structural parts. Furthermore, it features a short preparation cycle, high material utilization, and rapid forming.

This invention provides a coupled method for thermal cycling control and online cooling to maintain supersaturated solid solution. By integrating multiple online cooling devices and a closed-loop temperature control strategy, it achieves precise management of interlayer temperature, effectively suppressing premature precipitation of Y and O elements during the additive manufacturing process, maintaining a high degree of supersaturation in the matrix, and providing a favorable condition for the formation of ultrafine nano-precipitates in subsequent heat treatment. Simultaneously, the linkage between interlayer temperature window control and process parameter adjustment ensures that each layer experiences a similar thermal history, significantly improving the microstructure consistency along the height direction of the component and eliminating performance gradient differences present in traditional processes. The introduction of a periodic thermal cycling management strategy further releases thermal stress, homogenizes the temperature field, and prevents precipitation coarsening through rapid cooling, thereby improving the overall mechanical properties of the material. This invention provides an efficient, controllable, and reliable process solution for the additive manufacturing of high-performance ODS-RAFM steel.

This invention relates to the field of high-nitrogen duplex stainless steel preparation technology, and provides a method for preparing high-nitrogen duplex stainless steel. The method for preparing high-nitrogen duplex stainless steel provided by this invention involves placing stainless steel powder with a nitrogen content of 0.6 wt% or greater into a laser additive manufacturing apparatus for molding. During the molding of the high-nitrogen duplex stainless steel, the laser power is set to 150W-350W, the laser scanning spacing is 60-150 μm, the laser scanning layer thickness is 30-65 μm, and the laser scanning rate is 200-1200 mm / s. During molding, the material solidification rate is 10... 5 -10 7 K / s. This invention utilizes laser additive manufacturing to produce 10 5 -10 7 K / s ultra-fast solidification of the alloy matrix, with w(N)≥0.6% supersaturated solid solution in the alloy matrix, without Cr2N precipitation, enables PREN to exceed 50 and reach 52 or more.

The application discloses a strain-induced supersaturated solid solution analysis method for a non-miscible alloy system based on mixed entropy evolution, and the method comprises the following steps: for a target A-B binary alloy, a mixed entropy-component relationship diagram of the target A-B binary alloy is drawn; the average component and the initial equilibrium phase component point of the target A-B binary alloy are calibrated in the diagram; based on the increase of the mixed degree of the entropy generation driving force, the two-phase components are predicted to evolve in the entropy increase direction during a severe plastic deformation process, until a single-phase supersaturated solid solution is formed. Based on the irreversible thermodynamic principle, the severe plastic deformation process is defined as a continuous external entropy generation source for driving the evolution of the system, through the analysis of the dynamic competition mechanism of element mixing and element demixing dominated by the entropy generation source, the formation mechanism of the supersaturated solid solution is revealed, and the application provides a universal theoretical tool for understanding and predicting the supersaturated solid solution behavior of the non-miscible alloy system under the severe plastic deformation.

The application discloses a method for improving nucleation density of large-size single crystal diamond hetero-epitaxy based on iridium-amorphous carbon pre-implantation layer, which comprises the following steps: firstly, pretreating a single crystal silicon substrate through acid washing, acetone or ethanol ultrasonic cleaning method; sequentially epitaxially growing a nanometer-thickness yttrium stabilized zirconium oxide (YSZ) single crystal film buffer layer and an iridium single crystal film functional layer on the treated single crystal silicon surface; then, pre-implanting an amorphous carbon film on the surface of the iridium / YSZ composite substrate, and performing vacuum annealing stress relief and polishing graphite phase large particle removal treatment on the amorphous carbon film to obtain a smooth and flat surface; finally, epitaxially growing single crystal diamond on the surface of the iridium-amorphous carbon pre-implantation layer, and cutting and removing the composite substrate to obtain large-size single crystal diamond hetero-epitaxy. The method utilizes the amorphous carbon implantation layer to accelerate the dissolution-precipitation process of carbon ions entering the iridium film to form a supersaturated solid solution during bias nucleation, increases nucleation sites, and improves nucleation density, which is of great significance for preparing large-size high-quality single crystal diamond.

This invention discloses a multi-cavity thin-walled battery tray-type aluminum alloy profile for new energy vehicles and its preparation method, relating to the field of battery tray technology. The internal chemical composition of the aluminum alloy profile, by mass percentage, includes: Si: 0.65%–0.75%, Mg: 0.70%–0.85%, Cu: 0.10%–0.20%, Mn: 0.10%–0.18%, Cr: 0.06%–0.12%, Ti: 0.05%–0.10%, Sc: 0.02%–0.08%, Zr: 0.05%–0.12%, Fe≤0.20%, B≦0.10%, with the balance being Al. This invention successfully constructs a nanoscale dispersed reinforcing phase in the matrix through stepwise pretreatment of Sc / Ti elements and a two-stage aging process. Combined with an upward dual-medium quenching technology, the high-temperature zone utilizes a scandium oxide-containing water-based medium for rapid cooling, effectively freezing the supersaturated solid solution. The low-temperature zone utilizes an oil-based medium for slow cooling, eliminating harmful residual stress and significantly improving the load-bearing capacity and collision energy absorption safety of the battery tray.

This invention discloses an integrated method for medium-temperature hot forming and quenching of aluminum alloys, relating to the field of sheet metal forming and manufacturing technology. The method includes: S1, sheet metal solution treatment: heating the initial aluminum alloy sheet to the solution temperature and holding it at that temperature to obtain a supersaturated solid solution; S2, rapid transfer and cooling: transferring the solution-treated sheet to the final forming mold and cooling the sheet to the forming temperature; S3, rapid forming and in-mold quenching: while the sheet temperature is at the forming temperature, completing the stamping process in the mold to obtain the part, and then closing the mold for quenching; S4, mold opening and part removal: after in-mold quenching, opening the mold and removing the shaped part from the mold; S5, aging treatment: performing aging treatment on the quenched part. This invention provides an integrated method for medium-temperature hot forming and quenching of aluminum alloys, solving the problem of difficulty in simultaneously achieving material plasticity and hardening capacity in existing technologies.

This invention belongs to the field of materials forming technology and discloses a method for preparing ultrafine-grained, highly conductive Cu-Cr-Zr alloy by medium-temperature multi-directional forging. The specific technical solution is as follows: a Cu-Cr-Zr alloy billet is provided and subjected to solution treatment, followed by water cooling to obtain a supersaturated solid solution; the solution-treated billet and the mold are heated together to a forging temperature of 350~550℃, and the billet is subjected to multi-pass multi-directional forging. Each pass includes upsetting deformation along the three orthogonal directions X, Y, and Z of the billet. Through multi-directional forging under medium-temperature conditions, the Cu-Cr-Zr alloy achieves large plastic deformation, and while accumulating large strain, the grains are significantly refined to obtain a uniform ultrafine-grained structure, thereby achieving a good match between hardness and conductivity. Under optimal process conditions, the grain size of the alloy can be refined to 0.52 μm, the hardness can reach above 178 HV, and the conductivity can reach 67.1% IACS.

This invention discloses a preparation process for copper-nickel-silicon alloys for server connectors. This scheme optimizes the proportions of components such as nickel, silicon, and magnesium, and specifically designs the preparation process. Continuous extrusion causes dynamic recrystallization of the ingot, followed by solution treatment to form a supersaturated solid solution. High-density slip bands are generated during cold rolling. During the first-stage aging treatment, the reduction of shear bands promotes the growth of discontinuous Ni2Si phases. Fine cold rolling helps to combine precipitation strengthening and work hardening to achieve a dual-mechanism superposition, further improving the strength and other properties of the copper-nickel-silicon alloy. Second-stage aging helps eliminate internal stress from cold rolling and promotes the precipitation of trace amounts of solute, thereby improving stress relaxation resistance and electrical conductivity. This invention optimizes the component proportions of the copper-nickel-silicon alloy and specifically designs the preparation process, eliminating the need for hot rolling equipment and reducing costs. The prepared copper-nickel-silicon alloy exhibits excellent strength and electrical conductivity.

The application provides a low-temperature aging method for obtaining excellent performance combination of aluminum matrix and aluminum / steel interface, and belongs to the technical field of metal material heat treatment. The method comprises the following steps: firstly, heating a heat treatment furnace to 60-100 DEG C; then, putting aluminum / steel bimetal in a solid solution state into the heat treatment furnace, and keeping heat for 14-20 hours; finally, taking out and air cooling to room temperature to obtain low-temperature aging aluminum / steel bimetal. In the method, the low-temperature condition can slow down the deterioration of the aluminum / steel bimetal interface bonding quality in the aging process, and can induce the precipitation of the second phase in the supersaturated solid solution matrix of the bimetal aluminum alloy side, produce the precipitation strengthening effect, and improve the mechanical properties of the aluminum alloy side. The application has the advantages of simple and stable process, convenient operation, low energy consumption and strong applicability, and is suitable for industrial production.

This invention relates to a method for preparing lightweight alloys based on rare earth grading and multi-element solid solution synergistic strengthening, belonging to the technical field of lightweight alloy materials. The lightweight alloy is a magnesium alloy, and its components, by mass percentage, include: Zr: 0.3-0.8%, Mn: 0.3-0.8%, rare earth element Sm: 0.5-3.5%, with the balance being Mg and unavoidable impurities. By grading the addition of rare earth Sm, a multi-element solid solution synergistic effect is achieved with the inherent Zr and Mn elements in the alloy. After homogenization heat treatment, a supersaturated solid solution is formed, thereby changing the deformation mechanism of the alloy from basal slip-dominated to multi-system slip synergistic. Compared with the baseline alloy without added Sm, the alloy of this invention achieves significant improvements in yield strength and tensile strength, while also increasing elongation after fracture. This successfully solves the industry problem of balancing strength and plasticity in lightweight rare earth magnesium alloys, providing a new approach for the design of high-performance lightweight structural materials.

The invention relates to the technical field of water electrolysis hydrogen production, and discloses a nickel-based multi-element noble metal catalyst for a super-alkaline hydrogen production electrolytic bath and a preparation method of the nickel-based multi-element noble metal catalyst. The catalyst has a gradient structure of a nickel-based alloy core-noble metal-transition metal composite shell, a core layer is a Ni-Fe-Co-Mo supersaturated solid solution, a shell layer is an Ir-Ru-Ox / NiOOH composite oxide, and the surface has a nanosheet array morphology. The gradient structure effectively inhibits dissolution of core layer metal ions through the passivation protection effect of the shell layer, and the long-term operation stability of the catalyst is remarkably enhanced. Besides, the noble metal is only distributed on the surface shell layer, the dosage is extremely low, catalytic activity equivalent to that of a high-load noble metal catalyst is achieved through atomic dispersion and synergistic effect, the problem that high activity and low cost of a traditional catalyst are difficult to achieve at the same time is effectively solved, and the catalyst is especially suitable for large-scale green hydrogen production application of megawatt or above.

This invention discloses a method for preparing high-pressure crush-resistant aluminum alloy energy-absorbing box profiles for automobiles, relating to the field of aluminum alloy material processing technology. The method includes alloy composition ratio and casting, two-stage homogenization treatment, design of a special extrusion die, precision extrusion, high-strength online water quenching, and controllable aging. This invention improves the crush-resistant properties of the material from the source by optimizing the alloy composition system, controlling the Mg / Si ratio and modifying with trace amounts of Mn. By using a two-stage homogenization heat treatment combined with a rapid water cooling process, dendrite segregation is fully eliminated and alloy elements are evenly distributed. Rapid cooling also maximizes the retention of supersaturated solid solutions in the matrix, avoiding premature precipitation of the Mg2Si phase and ensuring the uniformity of the microstructure of cast bars from different batches. Combined with a special decompression structure extrusion die, the forming accuracy and microstructure uniformity of the profile are guaranteed, avoiding the risk of crush stress concentration cracking from the forming process.

The present application belongs to the technical field of aluminum alloy plate, and discloses a composite treatment method for inhibiting natural aging of aluminum alloy plate and improving artificial aging response and strength. The method comprises the following steps: S1) Zn and La composite alloying treatment is performed on aluminum alloy melt; then, a cast ingot is prepared, homogenization treatment, hot rolling, cold rolling and solid solution treatment are performed, and a supersaturated solid solution plate is obtained; S2) the supersaturated solid solution plate is cold-rolled to complete pre-deformation; and S3) the alloy plate after pre-deformation is subjected to natural aging and artificial aging treatment to complete final aging. The method fully utilizes the interactive effect of La and Zn element composite and pre-deformation, fully inhibits the formation of room temperature atom clusters in the natural aging process, promotes the precipitation of strengthening phase in the artificial aging process, so that the alloy has a significant artificial aging response, the strength and hardness of the alloy after response are significantly improved, and excellent plasticity is exhibited. The present application is easy to mass produce.