43results about How to "Weakened texture" patented technology

The invention relates to a large reduction rolling method for magnesium alloy. According to the rolling method, a hard alloy lining plate is additionally arranged on the upper surface or the lower surface of the magnesium alloy, or two hard alloy lining plates are additionally arranged on the upper surface and the lower surface of the magnesium alloy at the same time, and the added hard alloy lining plates are rolled synchronously together with the magnesium alloy. The rolling method includes the steps that after a high temperature lubricating agent is evenly smeared on the surfaces of the lining plates and the surface of the magnesium alloy, the high temperature lubricating agent, the lining plates and the magnesium alloy are simultaneously placed into a heating box to be heated, after the temperature rises to a preset temperature, standing and thermal insulation are performed for a certain period of time, one hard alloy lining plate is placed on the upper surface or the lower surface of magnesium alloy blank, or the two hard alloy lining plates are placed on the upper surface and the lower surface of the magnesium alloy at the same time, and the hard alloy lining plates and the magnesium alloy are simultaneously fed into the position between rollers so that rolling can be completed. Through the method, the single pass reduction of the magnesium alloy can be greatly increased in the rolling process, the number of rolling passes is decreased, magnesium alloy crystalline grains are thinned, the texture is weakened, magnesium alloy plates with high strength and plasticity are prepared, and the large reduction rolling method for the magnesium alloy is also suitable for the large deformation rolling process of titanium, manganese and metal-matrix composite materials.

The invention discloses a method for extruding high-performance light alloy sheet materials. The method comprises the following steps: 1) respectively taking at least one block of magnesium alloy and at least one block of aluminium alloy, and overlapping and fixing the magnesium alloy and the aluminium alloy; 2) putting a magnesium-aluminium composite block which is obtained in the step 1) into an extrusion mould to extrude the magnesium-aluminium composite block, and at the same time extruding the magnesium-aluminium composite block from the extrusion mould to obtain the composite extrusion sheet materials. According to the method for extruding the high-performance light alloy sheet materials, disclosed by the invention, greater shear stress is introduced in the same metal block, and metal mixing does not occur among all the metal sheet materials, so that crystal grains can be refined, and the texture can be weakened; for the method for extruding the high-performance light alloy sheet materials, which disclosed by the invention, only the extruding and compositing manner needs to be changed, and the extrusion mould does not need to be redesigned, so that the method has a greater production and research value.

The invention relates to a method for rolling fine-grained magnesium alloy with superplastic deformability. The method comprises the steps of low-rolling-reduction transverse rolling, high-rolling-reduction longitudinal asynchronous rolling, longitudinal reversed-direction rolling, low-temperature longitudinal rolling and annealing, and comprises the specific steps of heating a commercial magnesium alloy blank in a heating box, standing to preserve heat for a period of time after heating to a preset temperature, firstly pushing the magnesium alloy blank to an entrance of a rolling roller along the transverse direction, carrying out transverse rolling firstly, then, carrying out high-rolling-reduction longitudinal asynchronous rolling, then, carrying out longitudinal 180-degree-reversed rolling, then, carrying out low-temperature longitudinal rolling, and finally, carrying out low-temperature long-time annealing treatment or high-temperature short-time annealing treatment. According to the method, cracking during the rolling of the magnesium alloy can be reduced, the crystal grain of the magnesium alloy is refined, the texture is weakened, and the high-temperature plasticity of the magnesium alloy is improved; moreover, the process is simple and easy to operate, large-sized wide-width sheet materials can be prepared, and the formability of the magnesium alloy is improved remarkably, so that the method is applicable to the mass production of superplastic magnesium alloy and is prone to popularization and application.

The invention relates to a low-cost high-compression-strength wrought magnesium alloy and a preparation method thereof. The magnesium alloy material is composed of six elements, namely Mg, Zn, Mn, Sn,Ca and Cu, wherein the content of the Zn element is 4.0%-8.5%, the content of the Mn element is 0.1%-0.4%, the content of the Sn element is 0.1%-0.4%, the content of the Ca element is 0.1%-0.4%, thecontent of the Cu element is 0.1%-0.4%, the content of inevitable impurities is less than or equal to 0.15%, and the balance is the Mg; and compared with a traditional commercial grade magnesium alloymaterial, high compressive yield strength can be obtained after the magnesium alloy material is subjected to a conventional extrusion treatment, and the compressive yield strength of the alloy is obviously higher than tensile yield strength. The magnesium alloy material does not contain precious alloy elements, and is simple in preparation process and low in cost, has very important practical value for manufacturing a pressed magnesium alloy component.

The invention discloses an extrusion method of a metal composite board. The extrusion method of metal composite board comprises the following steps: firstly, laminating and fixing homogeneous or heterogeneous metal blocks together; secondly, adding the raw material into an extruding barrel for extruding, and extruding the homogeneous or heterogeneous metal blocks from an extruding mould port simultaneously in the extruding process to obtain an extruded composite board, wherein in the extruding process, macroscopic sliding between the metal blocks on the two sides of each contact interface between the metal blocks does not exist, and extruding flow velocity difference of the same metal block between a position near the contact interface and a position far away from the contact interface exists. According to the extrusion method of the metal composite board, relatively large shear stress is introduced into the same metal block, so that grains can be significantly refined and the texture can be significantly weakened; according to the extrusion method of the metal composite board, only an extruding composite way is required to be changed and the extruding barrel is not required to be redesigned, so that the extrusion method of the metal composite board has relatively high production and research values.

The invention relates to a large-deformation rolling technology based on asymmetric rolling equipment. According to the large-deformation rolling technology based on the asymmetric rolling equipment,a detachable bottom plate is replaced with a shaping demand bottom plate, a hydraulic adjustment device is adopted to adjust spacing between a roller and the bottom plate, the rolling temperature is adjusted through a roller heating plate and a bottom plate heating device, before rolling, a sample is placed into a sample heating device to be preheated to reach a preset deformation temperature, thesample is pushed into a feeding opening, a transmission unit is driven by a three-phase motor to make the roller rotate, and a gear-rack transmission device makes the roller and the bottom plate linked to complete rolling. By the adoption of the large-deformation rolling technology based on the asymmetric rolling equipment, after rolling, recrystallization and annealing treatment are combined tocarry out synergistic regulation to obtain fine-grain superplastic structure, multi-grade structure structure in which large and small crystal particles are mixed can also be obtained, and the strength and the plasticity are greatly improved at the same time; the grain size of plates is reduced, the texture of rolled plates is weakened, the performance of the rolled plates is improved, through cooperation of the roller and the work bottom plate, different kinds of plates can be prepared, technological processes are reduced, the machining cost is reduced, and the production efficiency is improved.

The invention discloses a low-cost high-plastic-deformation magnesium alloy. The magnesium alloy comprises the following components in percentage by mass: 0.5-4.0% of Mn, 0.1-0.5% of Al and the balance of magnesium and inevitable impurities. In an Mg-Al-Mn ternary system, elements manganese and aluminum define an aluminum-manganese phase, and a rich manganese element defines an elemental manganesephase. In a preparation process, an extrusion process at a relatively low temperature is adopted to prepare a high-plasticity magnesium alloy material which is suitable for 3C product shells, bearingstructures for leisure goods as well as aerospace parts and the like; and the material is simple in preparation process, is low in cost, and has a very good industrialized prospect.

The invention discloses a manufacturing method of a magnesium alloy bar. The manufacturing method of the magnesium alloy bar comprises the following steps that a raw blank is machined, so that the baris obtained; the bar is extruded; the bar is preheated; and the obtained magnesium alloy bar is subjected to hole pattern rolling operation, the rolling operation is conducted in sequence according to the diamond-square mode, 1-4 passes are conducted through the rolling operation, the rolling speed is 0.1m/s-0.5m/s, the bar is rotated by 90 degrees when each pass is changed in the rolling process, finally the square hole serves as the final rolling pass, the correction is conducted for one time, and therefore the final form of the bar can be guaranteed. By the adoption of the manufacturing method of the magnesium alloy bar, the anisotropy of the bar which is extruded to deform can be remarkably improved, and the toughness of the bar can be further improved.

The invention aims to provide a preparation method of a novel magnesium alloy thick plate. The alloy comprises, by mass, 3.5-5.0% of Al, 2.0-3.5% of Zn, 0.1-0.8% of Mn, 0.01-0.80% of RE, 0.001-0.090%of Ca, less than or equal to 0.005% of Fe, less than or equal to 0.05% of Si, less than or equal to 0.005% of Cu, less than or equal to 0.005% of Ni and the balance Mg, and the total content of impurities does not exceed 0.1%, wherein the sum of the Al content and the Zn content satisfies the condition that Al+Zn is greater than or equal to 6% and less than or equal to 8%. Aiming at a novel Mg-Al-Zn alloy system, a forming process for preparing the large-size magnesium alloy thick plate with low anisotropy and high strength is developed to satisfy urgent demands of such fields as aerospace, weaponry and automobiles on the magnesium alloy thick plate with low cost and high performance.

The invention discloses a method for achieving ATX series magnesium alloy plate texture weakening through asymmetric extrusion, and belongs to the technical field of magnesium alloy extrusion machining. The method comprises the following steps that an ATX series magnesium alloy ingot blank is homogenized, then a magnesium alloy plate is prepared by conventional extrusion, and the extruded plate ispreheated and put in an asymmetric extrusion die for being extruded. The central axis of a forming channel hole of the asymmetric extrusion die does not coincide with the central axis of an extrusiondie cavity, the proportions of blanks located on the left side and the right side of the forming channel hole in the die cavity are different, extra upsetting deformation is generated in the extrusion process of part of the blanks, the whole extrusion deformation process can be regarded as upsetting and extrusion deformation composite superposition, and therefore, the texture of the finally obtained asymmetric extrusion plate is obviously weakened compared with that of an initial extrusion plate. The asymmetric extrusion die is simple and convenient to manufacture, simple in technological operation and easy to implement, and has a good industrial application prospect.

The invention discloses a high-plasticity rapidly-degraded Mg-Li-Gd-Ni alloy which comprises the following chemical elements in percentage by mass: 1.0-10.0% of Gd, 0.2-2.0% of Ni, 5.5-10% of Li and the balance of Mg and inevitable impurities, and the total content of the impurities is less than or equal to 0.3%. The invention further discloses a preparation method of the Mg-Li-Gd-Ni alloy with high plasticity and capable of being rapidly degraded. According to the high-plasticity rapidly-degraded Mg-Li-Gd-Ni alloy provided by the invention, beta-Li of a BCC structure with more slippage systems is introduced into alpha-Mg, so that an alpha-Mg + beta-Li dual-phase matrix structure is constructed, and the plasticity of the alloy is improved; then a certain amount of Gd element is added into the Mg-Li alloy, the texture is weakened, and non-basal plane slippage is promoted; the plasticity of the alloy is improved by compounding a beta-Li phase with good plasticity and a plurality of plasticizing methods for generating LPSO toughness and the like; and moreover, a high-potential Ni-LPSO-containing phase is introduced, a large potential difference is formed between the Ni-LPSO-containing phase and alpha-Mg and beta-Li, galvanic corrosion is accelerated, and the degradation performance of the alloy is improved.

The invention discloses a high-plasticity magnesium alloy which comprises the following chemical elements in percentage by mass: 1.0-8.0% of Gd, 5.5-10% of Li and the balance of Mg and inevitable impurities, and the total content of the impurities is less than or equal to 0.3%. The invention further discloses a preparation method of the high-plasticity magnesium alloy. According to the high-plasticity magnesium alloy provided by the invention, the beta-Li phase of the BCC structure with more slippage systems is introduced into the alpha-Mg phase, so that a double-phase structure is constructed, and the plasticity of the magnesium alloy is improved; a certain amount of Gd element is added into the Mg-Li alloy, so that the texture is weakened, and non-basal plane slippage is promoted; plasticizing methods of introducing a beta-Li phase with good plasticity, weakening a texture and the like are combined, and the plasticity of the magnesium alloy is improved through compounding.

The invention discloses a novel sheet metal modification system and method based on current energy field assistance. The system comprises a sheet metal modification loading platform, a load platform, a first conductive roller group, a second conductive roller group and a power supply, wherein the sheet metal modification loading platform comprises an upper-layer insulating roller group and a lower-layer insulating roller group, the upper-layer insulating roller group comprises a plurality of upper-layer insulating rollers, and the lower-layer insulating roller group comprises a plurality of lower-layer insulating rollers; the upper-layer insulating rollers and the lower-layer insulating rollers are alternately distributed and linearly arranged; sheet metal is bent between the upper-layer insulating roller group and the lower-layer insulating roller group; the relative positions of the upper-layer insulating roller group and the lower-layer insulating roller group are adjusted through the load platform; and the sheet metal penetrates through the first conductive roller group, the sheet metal modification loading platform and the second conductive roller group, and the sheet metal, the first conductive roller group, the second conductive roller group and the power supply form a current heating circuit. The system and the method solve the problems of high energy consumption, high cost and low efficiency in the prior art.

The invention provides a heat treatment method for improving defects in an additive manufacturing beta-type titanium alloy, which comprises the following steps: providing the additive manufacturing beta-type titanium alloy, and the additive manufacturing beta-type titanium alloy contains the defects of pores and undissolved particles; the additive manufacturing beta-type titanium alloy is pressurized to preset pressure, and after the additive manufacturing beta-type titanium alloy is heated to preset temperature, the additive manufacturing beta-type titanium alloy is subjected to heat treatment; and cooling treatment is conducted, and the beta-type titanium alloy compact in structure is obtained. The method is simple in technological process, short in period, low in cost and small in subsequent machining allowance, defects are effectively improved on the basis of additive manufacturing of the beta-type titanium alloy, meanwhile, the structure can be improved and weakened through heat treatment, the anisotropy of the material is reduced, and then the strength, plasticity, fatigue resistance and other performance of the beta-type titanium alloy are improved.

The invention relates to the technical field of metal material processing equipment, in particular to a multi-directional repeated extrusion deformation processing device and a processing method for amagnesium alloy profile. The processing device comprises a male die, an upper female die and a lower female die; the upper female die is provided with a die cavity; the die cavity is composed of a male die channel and an extrusion channel; the male die channel is in a cuboid shape; the extrusion channel is in an inverted regular quadrangular frustum pyramid shape; the upper female die and the lower female die are connected, positioned and combined into the female die through screws and pins; and the male die is arranged in the male die channel and is matched with the male die channel. The processing device provided by the invention is simple in structure, convenient to operate, beneficial to extrusion sample demolding, capable of preparing a large number of high-performance magnesium alloy products of various sizes, capable of improving the production efficiency and the processing precision, easy to disassemble, convenient to maintain, small in abrasion to the male die under the condition of long-time extrusion production, and the magnesium alloy processed by the device has good strength, plasticity and corrosion resistance.