CN108913970A - A kind of WE43 magnesium alloy and preparation method thereof - Google Patents
A kind of WE43 magnesium alloy and preparation method thereof Download PDFInfo
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- CN108913970A CN108913970A CN201811117637.3A CN201811117637A CN108913970A CN 108913970 A CN108913970 A CN 108913970A CN 201811117637 A CN201811117637 A CN 201811117637A CN 108913970 A CN108913970 A CN 108913970A
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- mold
- magnesium alloy
- magnesium
- alloy
- extrusion
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
-
- 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
- B21C25/02—Dies
-
- 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
- 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
- B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Extrusion Of Metal (AREA)
- Forging (AREA)
Abstract
The invention discloses a kind of WE43 magnesium alloys, it is characterised in that：Its constituent mass percentage is：2.5-3% Al, 0.8-1.2% Zn, 0.15-0.2% Mn, 0.06% Si, 0.03% Cu, 0.02% Ni, 0.01% Fe, Mg surplus.It comprises the steps of：(1) every kind of raw material is chosen according to the quality proportioning, and the raw material of selection is preheated respectively, pure magnesium, magnesium silicon and the magnesium calcium intermediate alloy in the raw material are mixed; heating fusing forms melt under protective atmosphere; the temperature of fusing is 760 DEG C~850 DEG C, heat preservation, so as to form aluminium alloy；(2) temperature of the aluminium alloy is reduced, high-purity argon gas is then passed to be refined, heat preservation obtains the aluminium alloy of refining after standing, aluminium alloy after the refining is poured into mold, magnesium-alloy material is obtained after cooled and solidified, which obtains required magnesium-alloy material after squeezing by magnesium alloy channel corner hot-extrusion mold.
Description
Technical field
The present invention relates to the hot-pressed technology of magnesium alloy, specially a kind of WE43 magnesium alloy and its equal channel angular hot extrusion
Molding die is used for magnesium alloy hot extrusion manufacture field.
Background technique
Magnesium is one of the most abundant light metal alloy of reserves on the earth, and specific strength, specific stiffness are high；Thermally conductive, electric conductivity
It is good；With good damping and amortization, damping property, machinability and electromagnetic shielding performance；Processing cost is low, is easily recycled, and is praised
For the green engineering material that 21 century is most promising.Magnesium and its alloy are because having good damping performance, heating conduction
And it is widely used in aerospace and other field of traffic etc..But since magnesium has close-packed hexagonal（HCP）Crystal structure,
Slip system is few, compared with the other structural materials such as aluminium, steel, it is poor there are plasticity the disadvantages of, constrain magnesium and its alloy industrially
Application.Therefore, research improves the mechanical properties such as the plasticity of magnesium alloy and has a very important significance.
Super fine crystal material（Including nano material and submicron material）There are many good physics, chemistry and mechanical property,
So being plastically deformed using depth（SPD , severe plastic deformation）Method becomes to obtain ultra-fine grain
The concern and research of numerous material scholars, this, which is primarily due to ultrafine grain metal material, not to lose the plasticity for even improving material
With the room temperature intensity that material is increased substantially while toughness, so as to improve the comprehensive performance of material.Equal-channel Angular Pressing is made
For a kind of large plastometric set mode, Equal-channel Angular Pressing can make material obtain big strain thus by bulk coarse grained metal or conjunction
Gold is refined into the material with ultra-fine grained structure.Block sample sample is got under the action of pressure ram from a channel, is being turned
The pure shear shear deformation of approximate ideal occurs for material at angle, then squeezes out from another channel, and block tries cross sectional shape and sample
Sill is identical before deforming.Therefore, biggish dependent variable can be obtained by the way that extrusion deformation is repeated several times, is formed in material internal
The sub-micron even ultrafine-grained (UFG) microstructure of nano-grade size.Influence magnesium alloy processing performance mainly includes mould structure, extrusion path
Diameter, contact conditions, squeezes the technological parameters such as temperature at extrusion speed.Moreover, the original microstructure of material, phase composition before deforming
Deng to material after extruding microstructure and mechanical property also have important influence.
Currently, the blank of plastic deformation is also concentrated mainly on AZ series easy-deforming magnesium alloy, the high, plasticity for thermal stability
The magnesium-rare earth plastic deformation research of deformability difference is also seldom, and the magnesium-rare earth Equal-channel Angular Pressing country not yet appears in the newspapers
Road.
Summary of the invention
The technical problem to be solved by the present invention is to：For existing equal channel angular extrusion die in structure and mold heating
Deficiency existing for mode the purpose of the present invention is optimization mould structure, solves the problems, such as that traditional moulds heating method exists, solves
The non-uniform problem of plastic deformation as caused by mould structure, improves service life and the security performance of mold, solves traditional moulds
Heating method there are the problem of.
The technical scheme is that：A kind of WE43 magnesium alloy, constituent mass percentage are：3-4% Y,0.2-0.6%
Zr, 3.0-3.0% RE, Mg surplus.
The preparation method of a kind of WE43 magnesium alloy, it is characterised in that comprise the steps of：(1) according to the quality
Proportion chooses every kind of raw material, and preheats respectively to the raw material of selection, and heating fusing forms melt under protective atmosphere, melts
Temperature be 760 DEG C~850 DEG C, heat preservation, so as to form aluminium alloy；(2) temperature for reducing the aluminium alloy, then passes to high-purity
Argon gas is refined, and heat preservation obtains the aluminium alloy of refining after standing, and the aluminium alloy after the refining is poured into mold, cooling solidifying
Gu magnesium-alloy material is obtained after, which obtains required magnesium after squeezing by magnesium alloy channel corner hot-extrusion mold
Alloy product.
A kind of magnesium alloy channel corner hot-extrusion mold comprising mold and pressure ram, setting sample is logical in mold
Road, the specimen access be "<" type, the specimen access channel within angle is 120 °, and outside angle is 30 °, inside mistake
Spending arc radius is 3mm, and outer arc radius is 3mm, and channel diameter is 12mm.
Coating ceramic heating coil on the outside of the mold, and connected by attachment screw.
The mold side opens up warm hole, built-in thermocouple.
The mold further includes pedestal and locating shaft, and pedestal upper end offers mold fixation hole, with specific lower end
Pedestal fixes Block- matching, and pedestal lower end opens up the location hole to match with locating shaft.
The mold is cylinder, and two semi-cylindricals diametrically splitted by two form, above-mentioned two
Semi-cylindrical mold passes through the screw hole of locking to match and is spirally connected.
The ceramic heat circle includes that inside is equipped with heating coil, intermediate insulating layer and the outside of being equipped with equipped with shell.
The thermocouple, ceramic heat circle connect composition heating and temperature control system with temperature controller respectively.
Beneficial effects of the present invention：
The screw hole of bolt forms a bolt lock by the way of interconnection using layout of the counter sink bolt on mold
Tight train of mechanism, so that two half modules are tightened to an entirety.Bolt used is M12.
Locating shaft plays position-limiting action well in the horizontal direction by the cooperation with test machine platform, guarantees
Security performance of mold during extrusion experiment.
Surface smoothness Ra≤0.4 of die channel mould cavity plate die cavity reduces sample and cavity plate during extrusion experiment
Frictional force between die wall.
Pedestal and extrusion die（Mold）Cooperation, fit system is tight fit.
Interior angle of cut Φ=120 ° of two half module vertical channels and access ramp are set, the mainly plasticity such as such as magnesium alloy become
The material of shape ability difference, deflection hour avoid the surface of sample from cracking, prevent sample is from successfully squeezing out, in addition, compared with
Φ=90 °, the extruding force needed for Φ=120 ° is small, reduces the abrasion of mold, improves the service life of mold；
When outer 20 ° of angle of cut ψ < of mold, extruded sample cannot in channel proper flow, it is more difficult to mold intersection generate
Deform " dead zone ", it is contemplated that extruded sample can in channel proper flow, avoid deformation " dead zone " formation, set two channels
Outer angle of cut ψ=30 °；
In view of being reduced to the refining efficiency of material grains, but working as inside lock radius r when mold inside lock radius r is too small>
When 3mm, while influencing to be squeezed and deformed uniformity, it can also aggravate the abrasion of mold, reduce the service life of mold.
Using inventive die can smooth extrusion magnesium alloy stick, production cost is low, and blank deformation is uniform, surface quality compared with
It is good；
Mold heating is convenient, safe, and can dynamically control temperature, and the temperature difference of mold guarantees that blank is located always in ± 2 DEG C
In Isothermal Extrusion state, accuracy is higher；
Mould structure is simple, easy to use, low in cost, long service life.
Detailed description of the invention
Fig. 1 is equal channel angular hot extrusion（ECAP）Mold structure diagram；
Fig. 2 is extrusion rod structure schematic diagram used in extruded bars；
Fig. 3 is the sectional view of mold；
Fig. 4 is the main view of locating shaft；
Fig. 5 is the top view of locating shaft；
Fig. 6 is the SEM figure of the magnesium alloy sample after squeezing 1 time and 4 times；
In figure：1- pressure ram, 2- attachment screw, 3- mold, 4- specimen access, 5- pedestal, 6- locating shaft, 7- ceramic heat
Circle, 8- thermocouple.
Specific embodiment
Technical solution of the present invention is described in detail combined with specific embodiments below：
A kind of WE43 magnesium alloy, constituent mass percentage are：2.5-3% Al,0.8-1.2% Zn,0.15-0.2% Mn,
0.06% Si, 0.03% Cu, 0.02% Ni, 0.01% Fe, Mg surplus.
Preparation method comprises the steps of：(1) every kind of raw material is chosen according to above-mentioned quality proportioning, and to the original of selection
Material carries out 260 DEG C of preheating respectively, and heating fusing forms melt at protective atmosphere SF6, and the temperature of fusing is 760 DEG C~850 DEG C,
Heat preservation, so as to form aluminium alloy；(2) temperature for reducing the aluminium alloy, then passes to high-purity argon gas and is refined, and heat preservation is stood
Aluminium alloy after the refining is poured into mold, magnesium alloy bar is obtained after cooled and solidified by the aluminium alloy for obtaining refining afterwards, the magnesium
Alloy bar obtains required magnesium-alloy material after squeezing by magnesium alloy channel corner hot-extrusion mold.
A kind of magnesium alloy channel corner hot-extrusion mold comprising sample is arranged in mold in mold 3 and pressure ram 1
Channel 4, the specimen access 4 be "<" type, the 4 channel within angle of specimen access is 120 °, and outside angle is 30 °, interior
Side excessive circular radius is 3mm, and outer arc radius is 3mm, and channel diameter is 12mm；3 outside of mold
Coating ceramic heating coil 7, and connected by attachment screw 2；3 side of mold opens up warm hole, built-in thermocouple 8；Institute
The mold stated further includes pedestal 5 and locating shaft 6, and 5 upper end of pedestal offers mold fixation hole, solid with the pedestal of specific 3 lower end
Determine Block- matching, 5 lower end of pedestal opens up the location hole to match with locating shaft 6；The mold 3 is cylinder, by two
The two semi-cylindricals composition diametrically splitted, two above-mentioned semi-cylindrical molds lock screw hole spiral shell by what is matched
It connects；The ceramic heat circle 7 includes that inside is equipped with heating coil, intermediate insulating layer and the outside of being equipped with equipped with shell；The thermocouple
8, ceramic heat circle 7 connect composition heating and temperature control system with temperature controller respectively.
The magnesium alloy bar that the present embodiment extruded length is 100mm, diameter is 12mm.
The present embodiment mould therefor structure is as indicated, squeezing shank diameter is 12mm, and concave die cavity diameter is 12mm, and mold squeezes
It is as follows to press through journey：
（1）Use the clast that for 12mm magnesium alloy bar polish magnesium alloy bar outer surface is machined magnesium alloy blank vehicle into diameter
And burr, and in pressure ram and magnesium alloy bar even application lubricant；By concave die cavity inner wall cleaning, completely rear even application moistens
Lubrication prescription；
（2）Two semi-cylindricals that mold 3 is diametrically splitted by two form, and point are partly the first mold, the second mold, by the
One mold, the second mold are fastened by bolts, and pedestal, pedestal fixed block are assembled integrally, then by the first mold, the second mould
Have pedestal, pedestal and locating shaft assembling, by ceramic heat snare outside extrusion die, ceramic heat circle by the fixed inside of sheetmetal by
Ceramic heat circle and heat-preservation cotton composition, and fastened by screw, thermocouple is inserted into thermometric pore pressure；
（3）Mold is placed on test machine worktable, magnesium alloy bar is placed in mold and is heated with mold, to guarantee heating efficiency
With ensure that blank is in Isothermal Extrusion state, dispose a heat-preservation cotton, setting temperature control box temperature ginseng in thermometer hole and cavity plate end
Several and heating method.Set testing machine parameter.After reaching established temperature, after keeping the temperature 10 min, starts testing machine and starts to test,
Until off-test.Pressure ram applies a force to magnesium alloy bar in the effect of testing machine, and magnesium alloy bar stress passes through mold 3
It after the plastic deformation of corner, is then flowed out from mold 3, is shaped to magnesium alloy bar, mold is dismantled in off-test, is taken out
Sample clears up mold for future use.
Extruding force is smaller in the present embodiment extrusion process, and maximum extrusion pressure only has 30KN.The magnesium alloy bar surface light of acquisition
It is sliding, it is smaller to squeeze front and back sectional dimension variation.Therefore, multi-pass repeatability extruding can be carried out.
After can be, it is evident that being squeezed by apparatus of the present invention from Fig. 6, the goldc grains of alloy obviously becomes smaller,
And specimen surface is also more smooth, organizes finer and smoother.
Claims (10)
1. a kind of WE43 magnesium alloy, it is characterised in that：Its constituent mass percentage is：3-4% Y,0.2-0.6% Zr,3.0-
3.0% RE, Mg surplus.
2. a kind of WE43 magnesium alloy according to claim 1, it is characterised in that：The RE is Nd or Gd.
3. a kind of preparation method of WE43 magnesium alloy as described in claim 1, it is characterised in that：It comprises the steps of：(1) it presses
Every kind of raw material is chosen according to the quality proportioning, and the raw material of selection is preheated respectively, the heating fusing shape under protective atmosphere
At melt, the temperature of fusing is 760 DEG C~850 DEG C, heat preservation, so as to form aluminium alloy；(2) temperature of the aluminium alloy is reduced,
It then passes to high-purity argon gas to be refined, heat preservation obtains the aluminium alloy of refining after standing, the aluminium alloy after the refining is poured into
In mold, magnesium-alloy material is obtained after cooled and solidified, which is squeezed by magnesium alloy channel corner hot-extrusion mold
Required magnesium-alloy material is obtained afterwards.
4. a kind of magnesium alloy channel corner hot-extrusion mold as claimed in claim 3, it is characterised in that：It includes mold
（3）And pressure ram（1）, specimen access is set in mold（4）, the specimen access（4）For "<" type, the sample is logical
Road（4）Channel within angle is 120 °, and outside angle is 30 °, and inside excessive circular radius is 3mm, and outer arc radius is
3mm。
5. a kind of magnesium alloy channel corner hot-extrusion mold according to claim 4, it is characterised in that：The mold
（3）Outside coating ceramic heating coil（7）, and pass through attachment screw（2）Connection.
6. a kind of magnesium alloy channel corner hot-extrusion mold according to claim 4, it is characterised in that：The mold
（3）Side opens up warm hole, built-in thermocouple（8）.
7. a kind of magnesium alloy channel corner hot-extrusion mold according to claim 4, it is characterised in that：The mold is also
Including pedestal（5）And locating shaft（6）, pedestal（5）Upper end offers mold fixation hole, and specific（3）The pedestal of lower end is fixed
Block- matching, pedestal（5）Lower end opens up and locating shaft（6）The location hole to match.
8. a kind of magnesium alloy channel corner hot-extrusion mold according to claim 4, it is characterised in that：The mold
（3）For cylinder, two semi-cylindricals diametrically splitted by two are formed, and two above-mentioned semi-cylindrical molds pass through
The screw hole of locking to match is spirally connected.
9. a kind of magnesium alloy channel corner hot-extrusion mold according to claim 4, it is characterised in that：The ceramic heat
Circle（7）Heating coil, intermediate insulating layer and the outside of being equipped with are equipped with equipped with shell including inside.
10. a kind of magnesium alloy channel corner hot-extrusion mold according to claim 6, it is characterised in that：The thermocouple
（8）, ceramic heat circle（7）Composition heating and temperature control system are connect with temperature controller respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811117637.3A CN108913970A (en) | 2018-09-20 | 2018-09-20 | A kind of WE43 magnesium alloy and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811117637.3A CN108913970A (en) | 2018-09-20 | 2018-09-20 | A kind of WE43 magnesium alloy and preparation method thereof |
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| Publication Number | Publication Date |
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| CN108913970A true CN108913970A (en) | 2018-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811117637.3A Pending CN108913970A (en) | 2018-09-20 | 2018-09-20 | A kind of WE43 magnesium alloy and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021227403A1 (en) * | 2020-05-09 | 2021-11-18 | 深圳技术大学 | Equal channel angular pressing device and equal channel angular pressing temperature control apparatus thereof |
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| CN106350756A (en) * | 2016-10-31 | 2017-01-25 | 中南大学 | Method for homogenization heat treatment of rare earth-magnesium alloy casting |
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-
2018
- 2018-09-20 CN CN201811117637.3A patent/CN108913970A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| CN1792487A (en) * | 2005-12-22 | 2006-06-28 | 上海交通大学 | Method for extrusion two-step equal channel angle of magnesium alloy |
| CN101550510A (en) * | 2009-05-08 | 2009-10-07 | 重庆大学 | High intensity degradable biological medical magnesium alloy and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021227403A1 (en) * | 2020-05-09 | 2021-11-18 | 深圳技术大学 | Equal channel angular pressing device and equal channel angular pressing temperature control apparatus thereof |
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Application publication date: 20181130 |