CN114749505A - Preparation system and method of laminated heterogeneous alloy plate - Google Patents
Preparation system and method of laminated heterogeneous alloy plate Download PDFInfo
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- CN114749505A CN114749505A CN202210269836.6A CN202210269836A CN114749505A CN 114749505 A CN114749505 A CN 114749505A CN 202210269836 A CN202210269836 A CN 202210269836A CN 114749505 A CN114749505 A CN 114749505A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000000956 alloy Substances 0.000 title claims abstract description 25
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims description 11
- 238000001125 extrusion Methods 0.000 claims abstract description 61
- 229910000861 Mg alloy Inorganic materials 0.000 claims abstract description 52
- 229910001069 Ti alloy Inorganic materials 0.000 claims abstract description 48
- 238000010438 heat treatment Methods 0.000 claims abstract description 48
- SXSVTGQIXJXKJR-UHFFFAOYSA-N [Mg].[Ti] Chemical compound [Mg].[Ti] SXSVTGQIXJXKJR-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000002131 composite material Substances 0.000 claims abstract description 33
- 238000005098 hot rolling Methods 0.000 claims abstract description 26
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 3
- BVSORMQQJSEYOG-UHFFFAOYSA-N copper niobium Chemical compound [Cu].[Cu].[Nb] BVSORMQQJSEYOG-UHFFFAOYSA-N 0.000 claims 1
- 238000002203 pretreatment Methods 0.000 claims 1
- 239000010936 titanium Substances 0.000 description 21
- 229910052719 titanium Inorganic materials 0.000 description 16
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 12
- 239000011777 magnesium Substances 0.000 description 9
- DISRGUXSEDBDDN-OAHLLOKOSA-N 6-[6-(methoxymethyl)pyridin-3-yl]-4-[[(1R)-1-(oxan-4-yl)ethyl]amino]quinoline-3-carboxamide Chemical compound COCC1=CC=C(C=N1)C=1C=C2C(=C(C=NC2=CC=1)C(=O)N)N[C@H](C)C1CCOCC1 DISRGUXSEDBDDN-OAHLLOKOSA-N 0.000 description 8
- 238000001192 hot extrusion Methods 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 238000006317 isomerization reaction Methods 0.000 description 5
- 229910052758 niobium Inorganic materials 0.000 description 5
- 239000010955 niobium Substances 0.000 description 5
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 238000009763 wire-cut EDM Methods 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- IIQVQTNFAKVVCM-UHFFFAOYSA-N copper niobium Chemical compound [Cu][Nb][Nb] IIQVQTNFAKVVCM-UHFFFAOYSA-N 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910004349 Ti-Al Inorganic materials 0.000 description 3
- 229910004692 Ti—Al Inorganic materials 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 238000007731 hot pressing Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000013077 target material Substances 0.000 description 3
- 238000009966 trimming Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 229910001257 Nb alloy Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 238000007733 ion plating Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000029052 metamorphosis Effects 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/22—Making metal-coated products; Making products from two or more metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/06—Press heads, dies, or mandrels for coating work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/04—Cooling or heating of press heads, dies or mandrels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/383—Cladded or coated products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
Abstract
The invention relates to a system and a method for preparing a laminated heterogeneous alloy plate. The method comprises the following steps: (1) preparing a magnesium alloy plate and a titanium alloy plate; (2) carrying out composite extrusion: adopting an unequal-channel T-shaped corner extrusion die externally connected with a heating device, enabling a magnesium alloy plate and a titanium alloy plate to be arranged in a vertical channel of a vertically-arranged T-shaped channel in parallel, placing the titanium alloy plate at one side close to an outlet of the T-shaped channel, heating the alloy in the die and the channel, and simultaneously extruding the upper end and the lower end to obtain a primary titanium-magnesium composite plate; (3) circular extrusion: cutting and reshaping the first-stage titanium-magnesium composite plate, taking another magnesium alloy plate with the same thickness, and repeating the step (2); (4) and (4) repeating the steps (2) to (3) to obtain a multilayer titanium-magnesium composite plate, and carrying out hot rolling after carrying out heat treatment on the multilayer titanium-magnesium composite plate to obtain the laminated heterogeneous titanium-magnesium alloy plate. The invention provides a novel method for preparing a heterogeneous plate, and the prepared plate has good performance.
Description
Technical Field
The invention belongs to the field of material preparation, and particularly relates to a system and a method for preparing a laminated heterogeneous alloy plate.
Background
The magnesium alloy is formed by adding other elements into magnesium as a matrix, is the lightest metal structure material in the current practical application, has the advantages of small density, high strength, good damping property, good cutting processability and good casting performance, but is softer and poorer in bearing force in the conventional magnesium alloy. Titanium alloy has high strength, but has the defects of low plasticity and serious rebound. Therefore, how to effectively combine the advantages of magnesium alloy and titanium alloy becomes a direction to be studied.
The laminated heterogeneous material is formed by alternately combining two or more metal materials with large difference in mechanical properties in a pressure compounding mode. In the deformation process, all the components are coordinated and deformed with each other, so that a remarkable metamorphosis induced strengthening effect is generated, and the work hardening capacity and the strong plasticity matching of the material can be improved. The invention discloses a Ti-Mg nano multilayer alloy film and a preparation method thereof, which are found by the literature retrieval, and the Chinese invention patent CN112877641A introduces 'a Ti-Mg nano multilayer alloy film and a preparation method thereof', and the principle is that titanium and magnesium metal are used as target materials, multilayer film alternate deposition is realized by using a multi-arc ion plating technology, and the alloy film with a Ti-Mg nano multilayer structure is prepared by adjusting process parameters and relative deposition time of a Ti layer and a Mg layer. The thickness of the Ti-Mg nano multilayer film is 692.5nm-1.248 mu m. The method is characterized in that: (1) the multilayer structure of the Ti-Mg nano multilayer alloy film can be flexibly regulated and controlled by adjusting the parameters of the deposition process; (2) the prepared multilayer film has good structural uniformity and compact structure. The limitations are as follows: (1) the preparation process before coating comprises multiple processes of vacuumizing a multi-arc ion plating device, cleaning monocrystalline silicon, cleaning a target material by arc light, adjusting the position of the target material, starting coating, alternately depositing a titanium target and a magnesium target and the like, and has the advantages of complex operation, low production efficiency and small size; (2) the integrity of the resulting multilayer film cannot be guaranteed.
Further search shows that the Chinese invention patent CN113458400A introduces' a Ti-Al3The principle of the Ti intermetallic compound laminated composite board is that Ti-Al is used3C2Introduction of conventional Ti-Al3The interface layer of the Ti intermetallic compound laminated composite board is subjected to hot pressing sintering, Ti and Al are diffused mutually, and finally Ti and Al are formed on the interface layer3Ti-Al contained at the interface3C2/Al3A transitional interface layer of Ti phase. The technology is characterized in that: (1) the preparation can be realized by adjusting Al powder and Ti-Al in the composite powder3C2The ratio of the powder and the thickness of the composite powder layer are used for realizing Ti plates Al with different sizes3The hardness gradient of the interface between Ti and Ti; (2) the process flow is simple, and the thought is clear and easy to understand. However, this technique also has the following disadvantages: (1) the vacuum hot-pressing sintering has higher requirements on equipment and cost; (2) the experimental design scheme only aims at the metal material with specific components and has limitation; (3) before hot-pressing sintering, the material needs to be subjected to more complicated pretreatment for a longer time.
Disclosure of Invention
The invention aims to provide a system and a method for preparing a laminated heterogeneous alloy plate.
The technical solution for realizing the purpose of the invention is as follows: a preparation method of a laminated heterogeneous titanium-magnesium alloy plate comprises the following steps:
Step (1): preparing a magnesium alloy plate and a titanium alloy plate with the same size, and performing surface pretreatment;
step (2): carrying out composite extrusion: adopting an unequal-channel T-shaped corner extrusion die externally connected with a heating device, enabling a magnesium alloy plate and a titanium alloy plate to be arranged in a vertical channel of a T-shaped channel which is vertically arranged in parallel, placing the titanium alloy plate at one side close to an outlet of the T-shaped channel, heating the alloy in the die and the channel, and simultaneously extruding the upper end and the lower end to obtain a primary titanium-magnesium composite plate;
and (3): and (3) circular extrusion: cutting and shaping the primary titanium-magnesium composite plate obtained in the step (2), taking another magnesium alloy plate with the same thickness, and repeating the step (2);
and (4): and (4) repeating the steps (2) to (3) to obtain the required multilayer titanium-magnesium composite plate, carrying out heat treatment on the multilayer titanium-magnesium composite plate, and carrying out hot rolling to obtain the laminated heterogeneous titanium-magnesium alloy plate.
Further, the sizes of the magnesium alloy and the titanium alloy in the step (1) are as follows: the length is 10-100 mm, the thickness is 2-20 mm, and the width is twice of the thickness.
Further, the surface pretreatment specifically comprises: removing oil and acid to clean impurities and oxides on the surface, and then polishing the surface of the plate by using a grinding wheel.
Furthermore, the inlet and the outlet of the T-shaped channel of the unequal channel T-shaped corner extrusion die are both square, and the cross-sectional area of the outlet is smaller than that of the inlet.
Further, the specific process parameters of the step (2) of heating the alloy in the die and the channel and simultaneously extruding the upper end and the lower end to obtain the first-grade titanium-magnesium composite plate are as follows: the heating temperature range is 200-470 ℃, the heat preservation time is 20-30 min, the extrusion speed is 1-3 mm/s, and the pressure applied by the pressure heads at two ends is 500-2000 MPa.
Further, the heat treatment in the step (4) is specifically: the heating temperature is 350-450 ℃, and the heat preservation time is 5-30 min;
the accumulated hot rolling deformation in the step (4) is 10-90%.
The method is further used for preparing other laminated isomeric alloy plates except the titanium-magnesium composite plate.
Further, the method is used for preparing the laminated isomeric copper-niobium plate.
A laminated heterogeneous titanium-magnesium alloy plate is prepared by the method.
A system for preparing laminated heterogeneous alloy plates comprises an extrusion subsystem, a heat treatment subsystem and a rolling subsystem;
the extrusion subsystem comprises an unequal channel T-shaped corner die externally connected with a heating device and a pressure head and is used for generating a multilayer composite board;
The heat treatment subsystem is used for carrying out heat treatment on the multilayer composite board;
and the rolling subsystem is used for rolling the multilayer composite plate after heat treatment.
Compared with the prior art, the invention has the remarkable advantages that:
(1) the laminated isomeric magnesium-titanium alloy plate with multiple grain sizes and non-uniform layer thickness can be obtained through circular composite extrusion, wherein the magnesium alloy dynamically recrystallized has good plasticity; the titanium alloy layer is not dynamically recrystallized in a hot rolling way at the temperature, the formed deformed titanium alloy with higher dislocation density has high strength and good comprehensive mechanical property, and the contradiction relation between the strength and the plasticity is relieved.
(2) The invention can flexibly adjust the thickness of each alloy layer by changing the placing position of the plate to be extruded and the times of circular extrusion, thereby obtaining various microstructure patterns.
(3) The die is simple in structure, the shape of a die cavity can be adjusted according to the performance and production requirements of materials, the die is convenient to heat, the processing temperature is easy to control, and technological parameters are adjusted.
Drawings
FIG. 1 is a schematic view of the internal structure of a corner extrusion apparatus according to the present invention;
FIG. 2 is a schematic view of a co-extrusion process of the present invention;
FIG. 3 is a schematic view of a hot rolling process according to the present invention;
fig. 4 is a schematic view of the microstructure of the co-extruded metal sheet.
Description of the reference numerals:
1-upper pressure head, 2-lower pressure head, 3-upper action port, 4-lower action port, 5-extrusion outlet, 6-extrusion channel, 7-external heating device, 8-magnesium alloy layer, 9-titanium alloy layer, 10-heat treatment furnace, 11-roller and 12-magnesium-titanium alloy sheet.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
The T-shaped corner extrusion device shown in figure 1 performs repeated circular extrusion on the composite magnesium-titanium alloy to obtain the heterogeneous metal plate with the non-uniform layer thickness and the laminated layer. The extrusion device mainly comprises T-shaped corner extrusion equipment and an external heating device. Wherein the extrusion device mainly comprises a T-shaped channel and two end pressure heads. The feed inlets at two ends of the T-shaped channel are b & ltb & gt squares, the discharge outlets are b/2 & ltb/2 & gt squares, the T-shaped channel is extruded at the corners of the unequal channel, and the pressure heads at two ends can apply pressure of 5T at most. The external heating device can heat the alloy in the die and the channel, and the maximum temperature of the external heating device is 900 ℃. Because the inner diameter of the discharge port is smaller than that of the feed ports at two ends, in the extrusion process, compared with the traditional equal-channel angular extrusion, the unequal-channel angular extrusion mode can apply larger strain to the sample, and the sample can also be subjected to shear stress from the extrusion channel and extrusion force from the outlet channel, so that the combination of different plates is facilitated. In addition, the sheet layers with non-uniform thickness can be obtained in the process of circular extrusion, and the thickness of each component sheet layer can be flexibly regulated and controlled. Finally, hot rolling deformation is carried out on the laminated heterogeneous magnesium-titanium alloy blank with the non-uniform layer thickness obtained by circular extrusion, so that on one hand, the surface smoothness of the blank is improved, and the bonding capability of an interface is improved; on the other hand, the different microstructure responses of the magnesium alloy and the titanium alloy in the hot rolling deformation process are utilized to obtain the laminated isomeric magnesium-titanium alloy plate with the multiple grain sizes and the non-uniform layer thickness. Wherein the magnesium alloy sheet layer is subjected to hot rolling deformation to generate dynamic recrystallization, and the plasticity is good; the titanium alloy layer is hot rolled at the temperature without dynamic recrystallization, forms a deformation structure with higher dislocation density and has high strength. Finally, the laminated isomeric magnesium-titanium alloy can have excellent comprehensive mechanical properties.
The preparation method of the laminated heterogeneous titanium-magnesium alloy plate comprises four working procedures of surface pretreatment, composite extrusion, circular extrusion and heterogeneous hot rolling, and specifically comprises the following steps:
firstly, surface pretreatment: the method comprises the steps of cutting a magnesium alloy plate and a titanium alloy plate to be extruded into a certain size by utilizing wire cut electrical discharge machining, carrying out surface pretreatment after the magnesium alloy plate and the titanium alloy plate are 2-20 mm in width and thickness and 10-100 mm in length, cleaning surface impurities and oxides by means of oil removal, acid pickling and the like, and polishing the surface of the metal plate by utilizing a grinding wheel.
Step two, performing combined extrusion: and (3) putting the magnesium-titanium alloy plate after the pretreatment into an extrusion die channel, putting the magnesium alloy plate on the left side, putting the titanium alloy plate on the right side, tightly attaching the magnesium alloy plate and the titanium alloy plate, putting the magnesium alloy plate and the titanium alloy plate into the extrusion die channel, and installing a pressure head into feed inlets at two ends. Opening a heating system of the device, heating the magnesium and titanium alloy in the channel after setting corresponding temperature on the control panel, and after preserving heat for a period of time, simultaneously starting hot extrusion by the pressure heads at two ends to extrude the alloy into the right channel, wherein the heating temperature range is 200-470 ℃, the preserving heat time is 20-30 min, the extrusion speed is 1-3 mm/s, and the pressure applied by the pressure heads at two ends is 500-2000 Mpa, as shown in figure 2.
Thirdly, circular extrusion: taking out the laminated blank obtained by the first extrusion from the discharge port, cutting and shaping the edge of the blank by using a spark wire to form a block body in a regular shape, taking another magnesium alloy plate with the same thickness, performing surface pretreatment on the two plates in the first step, taking the magnesium alloy plate and the magnesium alloy plate as samples to be extruded, and repeating the hot extrusion in the second step, as shown in fig. 2.
Fourthly, isomerization hot rolling: and (3) obtaining a multilayer non-equal-thickness laminated isomeric magnesium-titanium alloy blank through multiple operations from the first step to the third step, then carrying out hot rolling on the blank at a certain temperature, placing the blank into a heat treatment furnace at a specified temperature for heat preservation for a period of time before the hot rolling, and obtaining a laminated isomeric magnesium-titanium alloy plate with a multi-grain size and non-uniform layer thickness after multiple rolling, wherein the laminated isomeric magnesium-titanium alloy plate is shown in fig. 3. Wherein the hot rolling temperature is 350-450 ℃, the heat preservation time is 5-30min, the accumulated hot rolling deformation is 10-90%, and the rolled product is shown in figure 4.
The preparation method mainly utilizes the following steps: (1) obtaining magnesium alloy and titanium alloy block materials to be extruded through wire cut electrical discharge machining and surface pretreatment; (2) carrying out composite extrusion and circular extrusion on the two alloy materials by using extrusion equipment with designed unequal diameters of a feeding hole and a discharging hole to obtain a laminated isomeric magnesium-titanium alloy blank with non-uniform layer thickness; (3) and (3) carrying out isomerization hot rolling on the laminated isomeric magnesium-titanium alloy blank to obtain the laminated isomeric magnesium-titanium alloy with multiple grain sizes and non-uniform layer thickness.
Example 1
Selecting industrial pure titanium and AZ31 magnesium alloy as materials to be extruded
(1) Surface pretreatment: cutting industrial pure titanium and AZ31 magnesium alloy to be extruded into cubic blocks with the length of 50mm and the bottom surface of 10mm x 5mm by wire cut electrical discharge machining, performing surface pretreatment, cleaning surface impurities and oxides by means of oil removal, acid washing and the like, and polishing the surface of a metal plate by using a grinding wheel to obtain a plurality of magnesium alloy and titanium alloy blocks with the same size.
(2) Putting the pretreated magnesium-titanium alloy plate into an extrusion channel with a feed inlet of 10mm and a discharge outlet of 5mm, putting AZ31 magnesium alloy block on the left side and industrial pure titanium block on the right side, tightly attaching the magnesium alloy block and the industrial pure titanium block, placing the magnesium alloy block and the industrial pure titanium block in the extrusion channel, respectively putting pressure heads into the feed inlets at two ends, opening a heating system of the device, setting the heating temperature on a control panel to be 400 ℃, heating the magnesium alloy and the titanium alloy in the mould and the channel, preserving heat for 30min after reaching the specified temperature, simultaneously carrying out hot extrusion on the plate by the pressure heads at two ends until the alloy is completely extruded into the channel at the right side, wherein the extrusion speed is 2mm/s, and the pressure applied by the pressure heads is 800 MPa.
(3) Circular extrusion: and (3) taking out the laminated blank from a discharge port, performing first extrusion to obtain a laminated blank, trimming the edge of the laminated blank by spark wire cutting to form a block in a regular shape, taking another AZ31 magnesium alloy block with the thickness of 50mm x 10mm x 5mm, performing surface pretreatment on the two blocks, taking the block as a sample to be extruded, and repeating the hot extrusion in the second step.
(4) Isomerization and hot rolling: and (3) carrying out 2 times of cyclic operation of the first step to the third step to obtain 7 layers of non-uniform-thickness laminated heterogeneous magnesium-titanium alloy blanks, then carrying out hot rolling on the blanks at a certain temperature of 400 ℃, putting the blanks into a heat treatment furnace at a specified temperature for heat preservation for 10min before the hot rolling, and carrying out multi-pass rolling to obtain a laminated heterogeneous magnesium-titanium alloy plate with the total thickness of 2.5mm, wherein the accumulated deformation is 50%.
Example 2
Selecting industrial pure titanium and AZ31 magnesium alloy as materials to be extruded
(1) Surface pretreatment: cutting industrial pure titanium and AZ31 magnesium alloy to be extruded into cubic blocks with the length of 50mm and the bottom surface of 10mm x 5mm by wire cut electrical discharge machining, performing surface pretreatment, cleaning surface impurities and oxides by means of oil removal, acid washing and the like, and polishing the surface of a metal plate by using a grinding wheel to obtain a plurality of magnesium alloy and titanium alloy blocks with the same size.
(2) Putting the pretreated magnesium-titanium alloy plate into an extrusion channel with a feed inlet of 10mm and a discharge outlet of 5mm, putting AZ31 magnesium alloy block on the left side and industrial pure titanium block on the right side, tightly attaching the magnesium alloy block and the industrial pure titanium block, placing the magnesium alloy block and the industrial pure titanium block in the extrusion channel, respectively putting pressure heads into the feed inlets at two ends, opening a heating system of the device, setting the heating temperature on a control panel to be 450 ℃, heating the magnesium alloy and the titanium alloy in the mould and the channel, preserving heat for 30min after reaching the specified temperature, simultaneously carrying out hot extrusion on the plate by the pressure heads at two ends until the alloy is completely extruded into the channel at the right side, wherein the extrusion speed is 3mm/s, and the pressure applied by the pressure heads is 1600 MPa.
(3) Circular extrusion: and (3) taking out the laminated blank from a discharge port, performing first extrusion to obtain a laminated blank, trimming the edge of the laminated blank by spark wire cutting to form a block in a regular shape, taking another AZ31 magnesium alloy block with the thickness of 50mm x 10mm x 5mm, performing surface pretreatment on the two blocks, taking the block as a sample to be extruded, and repeating the hot extrusion in the second step.
(4) Isomerization and hot rolling: and (3) carrying out 2 times of cyclic operation of the first step to the third step to obtain 7 layers of non-uniform-thickness laminated heterogeneous magnesium-titanium alloy blanks, then carrying out hot rolling on the blanks at a certain temperature of 450 ℃, putting the blanks into a heat treatment furnace at a specified temperature before the hot rolling, keeping the temperature for 20min, and carrying out multi-pass rolling to obtain a laminated heterogeneous magnesium-titanium alloy plate with the total thickness of 2.5mm, wherein the accumulated deformation is 50%.
Example 3
99.99 percent of industrial pure copper and pure niobium are selected as materials to be extruded
(1) Surface pretreatment: cutting industrial pure copper and pure niobium to be extruded into cubic blocks with the length of 50mm and the bottom surface of 10mm x 5mm by utilizing wire cut electrical discharge machining, performing surface pretreatment, cleaning surface impurities and oxides in a mode of oil removal, acid washing and the like, polishing the surface of a metal plate by utilizing a grinding wheel, and obtaining a plurality of pure copper and pure niobium blocks with the same size.
(2) Putting the pretreated copper-niobium plate into an extrusion channel with a feed inlet of 10mm x 10mm and a discharge outlet of 5mm x 5mm, putting a pure copper block on the left side and a pure niobium block on the right side, putting the pure copper block and the pure niobium block in the extrusion channel in a close fit manner, respectively putting pressure heads into the feed inlets at two ends, opening a heating system of the device, setting the heating temperature on a control panel to be 700 ℃, heating the die and the copper and niobium alloy in the channel, keeping the temperature for 30min after reaching the specified temperature, then simultaneously carrying out hot extrusion on the plate by the pressure heads at two ends until the alloy is completely extruded into the channel at the right side, wherein the extrusion speed is 1mm/s, and the pressure applied by the pressure heads is 400 MPa.
(3) Circular extrusion: taking out the laminated blank obtained by the first extrusion from the discharge port, trimming the edge of the blank by wire-cut electric spark to form a block body with a regular shape, taking another pure copper block material with the thickness of 50mm by 10mm by 5cm, performing surface pretreatment on the two blocks, taking the two blocks as a sample to be extruded, and repeating the hot extrusion in the second step.
(4) Isomerization hot rolling: and (3) obtaining 7 layers of laminated isomeric copper-niobium alloy blanks with unequal thicknesses through 2 times of cyclic operation of the first step to the third step, then carrying out hot rolling on the blanks at a certain temperature of 550 ℃, putting the blanks into a heat treatment furnace at a specified temperature for heat preservation for 10min before the hot rolling, and carrying out multi-pass rolling to obtain the laminated isomeric copper-niobium plate with the total thickness of 2.5mm, wherein the accumulated deformation is 50%.
Claims (10)
1. The preparation method of the laminated isomeric titanium-magnesium alloy plate is characterized by comprising the following steps:
step (1): preparing a magnesium alloy plate and a titanium alloy plate with the same size, and performing surface pretreatment;
step (2): carrying out composite extrusion: adopting an unequal-channel T-shaped corner extrusion die externally connected with a heating device, enabling a magnesium alloy plate and a titanium alloy plate to be arranged in a vertical channel of a T-shaped channel which is vertically arranged in parallel, placing the titanium alloy plate at one side close to an outlet of the T-shaped channel, heating the alloy in the die and the channel, and simultaneously extruding the upper end and the lower end to obtain a primary titanium-magnesium composite plate;
and (3): circular extrusion: cutting and shaping the primary titanium-magnesium composite plate obtained in the step (2), taking another magnesium alloy plate with the same thickness, and repeating the step (2);
and (4): and (4) repeating the steps (2) to (3) to obtain the required multilayer titanium-magnesium composite plate, carrying out heat treatment on the multilayer titanium-magnesium composite plate, and carrying out hot rolling to obtain the laminated heterogeneous titanium-magnesium alloy plate.
2. The method according to claim 1, wherein the dimensions of the magnesium alloy and the titanium alloy in step (1) are specified as follows: the length is 10-100 mm, the thickness is 2-20 mm, and the width is twice of the thickness.
3. The method according to claim 2, characterized in that the surface pre-treatment is in particular: removing oil and acid to clean impurities and oxides on the surface, and then polishing the surface of the plate by using a grinding wheel.
4. The method of claim 3, wherein the entrance and exit of the T-channel of the unequal channel T-comer extrusion die are square and the cross-sectional area of the exit is less than the cross-sectional area of the entrance.
5. The method according to claim 4, wherein the specific process parameters of the step (2) "heating the alloy in the die and the channel, and extruding the upper end and the lower end simultaneously to obtain the first-grade titanium-magnesium composite plate" are as follows: the heating temperature range is 200-470 ℃, the heat preservation time is 20-30 min, the extrusion speed is 1-3 mm/s, and the pressure applied by the pressure heads at two ends is 500-2000 MPa.
6. The method according to claim 5, wherein the heat treatment in step (4) is in particular: the heating temperature is 350-450 ℃, and the heat preservation time is 5-30 min;
the accumulated hot rolling deformation in the step (4) is 10-90%.
7. A method according to any one of claims 1 to 6, used for producing sheet materials of other laminated isomeric alloys than titanium-magnesium composite sheets.
8. The method of claim 7, used for producing a laminated isomeric copper niobium sheet material.
9. A laminated isomeric titanium-magnesium alloy sheet material, characterized in that it is produced by the method of any one of claims 1 to 6.
10. The system for preparing the laminated heterogeneous alloy plate is characterized by comprising an extrusion subsystem, a heat treatment subsystem and a rolling subsystem;
the extrusion subsystem comprises an unequal channel T-shaped corner die externally connected with a heating device and a pressure head and is used for generating a multilayer composite board;
the heat treatment subsystem is used for carrying out heat treatment on the multilayer composite board;
and the rolling subsystem is used for rolling the multilayer composite plate subjected to heat treatment.
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