CN106834843B - A kind of high-strength ultralight two phase structure magnesium lithium alloy plate and preparation method thereof - Google Patents
A kind of high-strength ultralight two phase structure magnesium lithium alloy plate and preparation method thereof Download PDFInfo
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- 239000001989 lithium alloy Substances 0.000 title claims abstract description 75
- 229910000733 Li alloy Inorganic materials 0.000 title claims abstract description 74
- GCICAPWZNUIIDV-UHFFFAOYSA-N lithium magnesium Chemical compound [Li].[Mg] GCICAPWZNUIIDV-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 49
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 48
- 239000011777 magnesium Substances 0.000 claims abstract description 40
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000005096 rolling process Methods 0.000 claims abstract description 36
- 239000011701 zinc Substances 0.000 claims abstract description 22
- 238000011282 treatment Methods 0.000 claims abstract description 21
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 18
- 238000007670 refining Methods 0.000 claims abstract description 16
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000000265 homogenisation Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 239000007921 spray Substances 0.000 claims abstract description 5
- 238000003801 milling Methods 0.000 claims abstract description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 26
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 18
- 238000005266 casting Methods 0.000 claims description 17
- 210000002966 serum Anatomy 0.000 claims description 15
- 238000009413 insulation Methods 0.000 claims description 12
- 239000004411 aluminium Substances 0.000 claims description 8
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 8
- 239000012300 argon atmosphere Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 230000002441 reversible effect Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 239000005030 aluminium foil Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 239000012298 atmosphere Substances 0.000 claims description 2
- 238000010792 warming Methods 0.000 claims description 2
- 229910052571 earthenware Inorganic materials 0.000 claims 1
- 230000001681 protective effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract 1
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 14
- 239000000243 solution Substances 0.000 description 14
- 238000010438 heat treatment Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 208000035126 Facies Diseases 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229910017073 AlLi Inorganic materials 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- AHLBNYSZXLDEJQ-FWEHEUNISA-N orlistat Chemical compound CCCCCCCCCCC[C@H](OC(=O)[C@H](CC(C)C)NC=O)C[C@@H]1OC(=O)[C@H]1CCCCCC AHLBNYSZXLDEJQ-FWEHEUNISA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 206010054949 Metaplasia Diseases 0.000 description 1
- 229910019400 Mg—Li Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000015689 metaplastic ossification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/006—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with use of an inert protective material including the use of an inert gas
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
-
- 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
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- 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
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Metal Rolling (AREA)
Abstract
A kind of high-strength ultralight two phase structure magnesium lithium alloy plate and preparation method thereof, belongs to technical field of material metallurgy, board composition is Li 5.7 10.0% by mass percentage, Al 2.5 3.5%, Zn 1.2 2.0%, Y 0.1 0.3%, surplus is Mg and impurity, 1.50 1.60g/cm of density3, tensile strength >=270MPa；Preparation method is：（1）Prepare raw material；（2）Raw material drying processing, magnesium metal is melted（3）Mg Y intermediate alloys, aluminum and zinc are added, sprays coverture, temperature control stirring；（4）Cooling, lithium metal is pressed into, and is sprayed coverture and is stirred, and adds refining agent stirring refining；（5）Cast after standing；（6）Homogenization Treatments；（7）The reciprocal warm-rolling of constant temperature after face milling；（8）Solution treatment when low temperature is long, is air-cooled to room temperature post-tensioning leveling.The method of the present invention increases substantially the intensity of the magnesium lithium alloy, obtains the magnesium lithium alloy plate of low-density and good plasticity.
Description
Technical field
The invention belongs to metallurgical material technical field, be specifically designed a kind of high-strength ultralight two phase structure magnesium lithium alloy plate and
Its preparation method.
Background technology
Magnesium lithium alloy is alloy material most light on the current earth, density 1.35-1.65g/cm3, about general aluminium conjunction
The 1/2 of golden density, the 3/4 of ordinary magnesium alloy density.Magnesium lithium alloy has low-density, high specific strength, high specific stiffness, good anti-
High energy particle penetration performance, excellent capability of electromagnetic shielding, good welding performance and excellent cold forming ability etc. are many
Advantage, is with a wide range of applications in the fields such as Aeronautics and Astronautics, military affairs, communication, 3C electronic products.In recent years, world's work
The production of industry metaplasia requires energy-saving and emission-reduction, reduction energy consumption, environmental protection etc., excites magnesium lithium alloy and dives in following extensive development
Power.At present, active demand of the numerous areas such as the aerospace in China to material lightweight is the development and application of magnesium lithium alloy
Provide more opportunities and challenges.With addition Li in magnesium alloy（Lithium）Element, with the increase of Li contents, under the density of alloy is gradual
Drop, plasticity gradually increases, but intensity gradually reduces, and therefore, magnesium lithium alloy has the characteristics that low-density and high-ductility.But magnesium lithium alloy
The shortcomings of intensity is low, founding manufacturing cost is high, corrosion resistance is poor limits application of the magnesium lithium alloy in national economy.Therefore, it is high
The research and development and its efficient preparation process exploitation of strong super-light Mg-Li alloy have very important significance.
The crystal structure of general magnesium and its alloy is hcp（Close-packed hexagonal）Structure, but the crystal structure of magnesium lithium alloy is because of Li
Content is different and changes.In magnesium lithium bianry alloy, when Li contents are less than 5.7wt.%, alloy substrate by hcp α-Mg groups
Into when Li contents are 5.7wt.%-10.3wt.%, there is bcc in alloy substrate（Body-centered cubic）The β phases of structure, are changed into alpha+beta
Two phase structure, when Li contents are higher than 10.3wt.%, alloy substrate is completely transformed into the phase structure being made of the β-Li of bcc.
But the intensity in two-phase section and the magnesium lithium bianry alloy of complete β phase regions is no more than 120MPa, therefore generally use includes
The further alloying of alloying element including Al, Zn etc. is strengthened to realize.Research shows that Al elements have magnesium lithium alloy significantly
Invigoration effect, when Al content is less than 6wt.%, clearly, but when being higher than 6wt.%, intensity tendency is in gentle shape for intensity increase
State.Zn elements also have magnesium lithium alloy similar invigoration effect, but in view of the low-density of alloy, so Zn members in magnesium lithium alloy
The content of element is unsuitable excessive.Rare earth element is also the intensified element of magnesium lithium alloy, and wherein Y element can not only realize that solid solution is strong
Change, can also form Mg with Mg24Y5Hardening constituent, and the mutually thermally treated achievable dispersion-strengtherning.In Application No.
In 201110266610.2 patent, high-ductility magnesium lithium alloy and preparation method containing Y element are disclosed, although ensure that conjunction
The high-ductility of gold, but the intensity of its alloy is still very low, is 145-175MPa.
The content of the invention
The object of the present invention is to provide a kind of high-strength ultralight two phase structure magnesium lithium alloy plate and preparation method thereof, pass through
Composition design and melting, the adjustment of heat treatment and drawing process, obtain low-density, good plasticity and high-strength magnesium-lithium alloy
Plate.
The component of the high-strength ultralight two phase structure magnesium lithium alloy plate of the present invention is Li 5.7-10.0% by mass percentage,
Al 2.5-3.5%, Zn 1.2-2.0%, Y 0.1-0.3%, surplus are Mg and impurity, density 1.50-1.60g/cm3, tensile strength
≥270MPa。
Elongation >=15% of above-mentioned high-strength ultralight two phase structure magnesium lithium alloy plate.
The matrix of above-mentioned high-strength ultralight two phase structure magnesium lithium alloy plate is α-Mg+ β-Li two phase structures.
The preparation method of the high-strength ultralight two phase structure magnesium lithium alloy plate of the present invention carries out according to the following steps：
1st, magnesium metal, lithium metal, metallic aluminium, metallic zinc and Mg-25%Y intermediate alloys are prepared as raw material；
2nd, then magnesium metal is placed in crucible and heated up respectively at 150 ± 5 DEG C of drying process 30-120min by each raw material
To 720 ± 5 DEG C, Serum Magnesium is formed after magnesium metal all fusing；
3rd, Serum Magnesium is placed under argon atmosphere, by dried Mg-25%Y intermediate alloys, metallic aluminium and metallic zinc
It is sequentially placed into Serum Magnesium, and sprays coverture covering Serum Magnesium surface, control temperature at 700-720 DEG C and is stirred, treats
In crucible an alloy melt is formed after whole metal moltens；
4th, under argon atmosphere, an alloy melt is cooled to 670-680 DEG C, the gold for aluminium foil being wrapped up with bell jar
Belong to lithium to be pressed into an alloy melt, and spray coverture covering Serum Magnesium surface, then an alloy melt is stirred,
After whole metal moltens in crucible, add refining agent and stir 15-30s up and down, form secondary alloy melt；
5th, secondary alloy melt is stood into 8-10min, controls the temperature of secondary alloy melt at 670-680 DEG C, Ran Hou
Cast under argon atmosphere, obtain magnesium lithium alloy ingot casting；It is Li 5.7-10.0%, Al by mass percentage to control its component
2.5-3.5%, Zn 1.2-2.0%, Y 0.1-0.3%, surplus are Mg and impurity；
6th, magnesium lithium alloy ingot casting is heated to 270-280 DEG C of insulation 6-8h, then water cooling to room temperature, is completed at homogenization
Reason；
7th, strand is formed after the magnesium lithium alloy after Homogenization Treatments being carried out face milling, constant temperature warm-rolling is carried out to strand,
Warm-rolling temperature is 150-200 DEG C, overall reduction 60-80%, obtains warm-rolling magnesium lithium alloy plate；
8th, warm-rolling magnesium lithium alloy plate is heated to 270-280 DEG C of insulation at least 24h and completes solution treatment, be air-cooled to room temperature,
Then room temperature tensile leveling processing is carried out, stretcher strain amount is 2-4%, obtains high-strength ultralight two phase structure magnesium lithium alloy plate.
Above-mentioned coverture component contains LiCl 80 ± 1%, LiF 20 ± 1%, granularity 0.1-1mm by mass percentage.
Above-mentioned refining agent component contains LiBr 20 ± 1%, LiCl 65 ± 1%, LiF 15 ± 1%, granularity by mass percentage
0.1-1mm。
In the above method, the mill speed of warm-rolling is 1.5-2.5mm/s, and it is 10-20 passages to roll total passage, and use is reversible
Reciprocal rolling mode.
The substantive distinguishing features and marked improvement that the present invention has are：
Using alpha+beta two-phase magnesium lithium alloy as base, by adding Al and Zn and micro addition Y in right amount, with reference to Control of Impurities, and
Mainly by special rolling and heat treatment method, and posterior drawing leveling method, strengthen MgAlLi2With AlLi in β phases
Reinforcing effect and meanwhile ensure that complete solution strengthening and the Al of Zn2The dispersion-strengtherning of Y hardening constituents, is finally ensureing the conjunction of magnesium lithium
High intensity is realized on the premise of golden low-density and preferable plasticity；
Realize that magnesium lithium alloy is molten under atmospheric environment with the guard method that special coverture is combined using inert gas
Refining and casting, reduce the complexity of alloy preparation manipulation, and ensure that the degree of purity of alloy melt, for the big rule of the magnesium lithium alloy
Lattice blank prepares and provides possibility；
The characteristics of magnesium lithium alloy multi-pass aximal deformation value constant temperature reciprocal warm-rolling technology is：（a）Constant temperature rolls and with warm-rolling system,
The plastic deformation ability of magnesium lithium alloy is improved, reduces the generation of plate defect, ensure that the continuity of the reciprocal operation of rolling, and
The Effective Regulation to deformation process recrystallization behavior can be achieved, the holding for the high intensity and plasticity of plate provides condition；（b）
Further by Proper Match of the mill speed (roller speed) with drafts, make dynamic recrystallization behavior equal in plate upper, middle and lower portion
Occur evenly, obtain size uniform, tiny equiax crystal, so as to improve the mechanical performance of plate and reduce plate
Anisotropy, improves plate capacity to reprocess；（c）Using the reversible reciprocal rolling of multi-pass, it is to pass through multi- pass rolling
Ensure the necessary aximal deformation value of large deformation energy storage, so as to provide appropriate driving force for dynamic recrystallization and subsequent heat treatment, together
When be also with reference to heat treatment to realize Al2The further thin dispersion of Y hardening constituents provides condition, passes through the reciprocal rolling in reversable mill
The heat shortened between rolling pass scatters and disappears, and to ensure the substantially constant of rolled slab temperature, realizes controllable dynamic recrystallization；
The solution treatment when low temperature of magnesium lithium alloy is long, promotes MgAlLi2With precipitation of the AlLi phases in β matrixes so that
Softer β phases are strengthened, so as to increase substantially the intensity of the magnesium lithium alloy；The room of magnesium lithium alloy plate after solution treatment
Temperature stretching leveling processing, not only ensures the glacing flatness of cold plate material, while also act as certain strain hardening effect.
Brief description of the drawings
Fig. 1 is that figure is compared in the XRD facies analyses before and after the warm-rolling magnesium lithium alloy plate solution treatment in the embodiment of the present invention 1；Figure
In, top curve is after solution treatment, lower curve is before solution treatment；
Fig. 2 is the SEM shape appearance figures before the warm-rolling magnesium lithium alloy plate solution treatment in the embodiment of the present invention 1；
Fig. 3 is the SEM pattern phases after the warm-rolling magnesium lithium alloy plate solution treatment in the embodiment of the present invention 1；
Fig. 4 is the pressure bell-type stirring tool in the embodiment of the present invention；In figure, 1, connecting rod, 2, cover plate, 3, through hole.
Embodiment
In the alloy cast ingot of the present invention, all dirt element is including Ca, Fe, Cu, Ni etc., and total amount is less than 0.1%, wherein Fe
≤ 0.05%, Ca≤0.02%.
The crucible used in the embodiment of the present invention is iron material matter.
Casting uses water cooled copper mould in the embodiment of the present invention.
Magnesium metal, lithium metal, metallic aluminium, metallic zinc and the Mg-25%Y intermediate alloys used in the embodiment of the present invention is city
Purchase.
Raw material Li Br, LiCl and LiF of coverture and refining agent are purchased in market in the embodiment of the present invention.
Coverture component contains LiCl 80 ± 1% by mass percentage in the embodiment of the present invention, LiF 20 ± 1%, LiCl and
The total amount of LiF is 100%, granularity 0.1-1mm.
Above-mentioned refining agent component contains LiBr 20 ± 1%, LiCl 65 ± 1%, LiF 15 ± 1% by mass percentage,
The total amount of LiBr, LiCl and LiF are 100%, granularity 0.1-1mm.
The preparation method of coverture and refining agent is after the completion of each raw material is prepared in the embodiment of the present invention, and heating fusing is simultaneously
Stir evenly, then cooling slabbing of casting, last grind into powder sealing are spare.
In the embodiment of the present invention before warm-rolling, strand and roll are preheated, strand preheating temperature, that is, rolling temperature is
150-200 DEG C, preheating time 30-60min, to realize that constant temperature rolls, roll preheating temperature is identical with rolling temperature, during preheating
Between be 2-3h.
Performance test uses national standard GB/T6397-1986, rate of extension 1mm/min in the embodiment of the present invention.
The equipment that tissue observation uses in the embodiment of the present invention is LEICA-DMR metallographic microscope.
The equipment that facies analysis uses in the embodiment of the present invention turns target diffractometer for D/max-rA types.
The thickness of high-strength ultralight two phase structure magnesium lithium alloy plate is 1.5-2.5mm in the embodiment of the present invention.
Stirring up and down in the embodiment of the present invention is to realize melt in the height direction upper using pressure bell-type stirring tool
Lower convection current, makes melt be come into full contact with refining flux, is settled afterwards during standing by refining agent to realize clean-up effect.
Pressure bell-type stirring tool structure in the embodiment of the present invention is covered as shown in figure 4, be evenly distributed with through hole 3 on cover plate 2
2 center of plate is fixed together with connecting rod 1.
Embodiment 1
Prepare magnesium metal, lithium metal, metallic aluminium, metallic zinc and Mg-25%Y intermediate alloys as raw material；
By each raw material respectively in 150 ± 5 DEG C of drying process 30min, then magnesium metal is placed in crucible and is warming up to 720 ±
5 DEG C, Serum Magnesium is formed after magnesium metal all fusing；
Serum Magnesium is placed under argon atmosphere, by dried Mg-25%Y intermediate alloys, metallic aluminium and metallic zinc according to
It is secondary to be placed in Serum Magnesium, and coverture covering Serum Magnesium surface is sprayed, control temperature at 710 DEG C and is stirred, treats in crucible
An alloy melt is formed after whole metal moltens；
Under argon atmosphere, an alloy melt is cooled to 670 DEG C, the lithium metal pressure for aluminium foil being wrapped up with bell jar
Enter in an alloy melt, and spray coverture covering Serum Magnesium surface, then an alloy melt is stirred, treats crucible
After middle whole metal molten, add refining agent and continue stirring 15s up and down, form secondary alloy melt；
Secondary alloy melt is stood into 8min, controls the temperature of secondary alloy melt then to protect gas in argon gas at 670 DEG C
Cast under atmosphere, obtain magnesium lithium alloy ingot casting；Magnesium lithium alloy ingot casting component is Li 5.7%, Al 3.5%, Zn by mass percentage
1.6%, Y 0.2%, surplus are Mg and impurity；
Magnesium lithium alloy ingot casting is heated to 270 DEG C of insulation 8h, then water cooling to room temperature, completes Homogenization Treatments；
Strand is formed after magnesium lithium alloy after Homogenization Treatments is carried out face milling, constant temperature warm-rolling, temperature are carried out to strand
Temperature is rolled for 150 DEG C, and overall reduction 60%, obtains warm-rolling magnesium lithium alloy plate；The mill speed of warm-rolling is 2.5mm/s, and rolling is total
Passage is 10 passages, using reversible reciprocal rolling mode；
Warm-rolling magnesium lithium alloy plate is heated to 275 DEG C of insulation 24h and completes solution treatment, room temperature is air-cooled to, then carries out room
Temperature stretching leveling processing, stretcher strain amount is 4%, obtains high-strength ultralight two phase structure magnesium lithium alloy plate；Wherein before solution treatment
The results are shown in Figure 1 for XRD facies analyses afterwards, and SEM patterns difference is as shown in Figures 2 and 3；The high-strength ultralight two phase structure magnesium lithium obtained
The matrix of sheet alloy is α-Mg+ β-Li two phase structures, density 1.60g/cm3, tensile strength 279MPa, elongation
15.9%。
Embodiment 2
With embodiment 1, difference is method：
（1）Raw material is respectively in 150 ± 5 DEG C of drying process 60min；
（2）After spraying coverture, 715 DEG C of temperature is controlled；
（3）One time alloy melt is cooled to 680 DEG C；Add refining agent and stir 20s up and down；
（4）Secondary alloy melt stands 9min, controls 680 DEG C of temperature；Magnesium lithium alloy ingot casting component is by mass percentage
Li 10.0%, Al 3.3%, Zn 2.0%, Y 0.15%, surplus are Mg and impurity；
（5）Magnesium lithium alloy ingot casting is heated to 275 DEG C of insulation 7h；
（6）Warm-rolling temperature is 200 DEG C, overall reduction 80%, mill speed 2.5mm/s, rolls total passage as 20
It is secondary；
（7）Roll magnesium lithium alloy plate and be heated to 270 DEG C of insulation 28h completion solution treatment；Stretch the stretcher strain of leveling processing
Measure as 3%；
（8）The density 1.50g/cm of high-strength ultralight two phase structure magnesium lithium alloy plate3, tensile strength 275MPa, elongation
15.3%。
Embodiment 3
With embodiment 1, difference is method：
（1）Raw material is respectively in 150 ± 5 DEG C of drying process 90min；
（2）After spraying coverture, 700 DEG C of temperature is controlled；
（3）One time alloy melt is cooled to 675 DEG C；Add refining agent and stir 25s up and down；
（4）Secondary alloy melt stands 10min, controls 675 DEG C of temperature；Magnesium lithium alloy ingot casting component is by mass percentage
Li 6.4%, Al 2.8%, Zn 1.6%, Y 0.3%, surplus are Mg and impurity；
（5）Magnesium lithium alloy ingot casting is heated to 280 DEG C of insulation 7h；
（6）Warm-rolling temperature is 180 DEG C, and overall reduction 70%, mill speed 2mm/s, it is 15 passages to roll total passage；
（7）Roll magnesium lithium alloy plate and be heated to 280 DEG C of insulation 36h completion solution treatment；Stretch the stretcher strain of leveling processing
Measure as 3%；
（8）The density 1.59g/cm of high-strength ultralight two phase structure magnesium lithium alloy plate3, tensile strength 276MPa, elongation
16.1%。
Embodiment 4
With embodiment 1, difference is method：
（1）Raw material is respectively in 150 ± 5 DEG C of drying process 120min；
（2）After spraying coverture, 720 DEG C of temperature is controlled；
（3）One time alloy melt is cooled to 675 DEG C；Add refining agentUp and downStir 30s；
（4）Secondary alloy melt stands 10min, controls 675 DEG C of temperature；Magnesium lithium alloy ingot casting component is by mass percentage
Li 8.9%, Al 3.1%, Zn 1.8%, Y 0.3%, surplus are Mg and impurity；
（5）Magnesium lithium alloy ingot casting is heated to 280 DEG C of insulation 6h；
（6）Warm-rolling temperature is 160 DEG C, overall reduction 75%, mill speed 2.5mm/s, rolls total passage as 18
It is secondary；
（7）Roll magnesium lithium alloy plate and be heated to 280 DEG C of insulation 30h completion solution treatment；Stretch the stretcher strain of leveling processing
Measure as 2%；
（8）The density 1.58g/cm of high-strength ultralight two phase structure magnesium lithium alloy plate3, tensile strength 273MPa, elongation
16.4%。
Claims (4)
- A kind of 1. preparation method of high-strength ultralight two phase structure magnesium lithium alloy plate, it is characterised in that the high-strength ultralight two-phase The component of structure magnesium lithium alloy plate is Li 5.7-10.0%, Al 2.5-3.5%, Zn 1.2-2.0%, Y by mass percentage 0.1-0.3%, surplus are Mg and impurity, density 1.50-1.60g/cm3, tensile strength >=270MPa；Method carries out according to the following steps：（1）Prepare magnesium metal, lithium metal, metallic aluminium, metallic zinc and Mg-25%Y intermediate alloys as raw material；（2）By each raw material respectively in 150 ± 5 DEG C of drying process 30-120min, then magnesium metal is placed in crucible and is warming up to 720 ± 5 DEG C, Serum Magnesium is formed after magnesium metal all fusing；（3）Serum Magnesium is placed under argon atmosphere, by dried Mg-25%Y intermediate alloys, metallic aluminium and metallic zinc according to It is secondary to be placed in Serum Magnesium, and coverture covering Serum Magnesium surface is sprayed, control temperature at 700-720 DEG C and is stirred, and treats earthenware In crucible an alloy melt is formed after whole metal moltens；（4）Under argon atmosphere, an alloy melt is cooled to 670-680 DEG C, the metal for aluminium foil being wrapped up with bell jar Lithium is pressed into an alloy melt, and sprays coverture covering Serum Magnesium surface, and then an alloy melt is stirred, is treated In crucible after whole metal moltens, add refining agent and stir 15-30s up and down, form secondary alloy melt；（5）Secondary alloy melt is stood into 8-10min, the temperature of secondary alloy melt is controlled at 670-680 DEG C, then in argon gas Cast under protective atmosphere, obtain magnesium lithium alloy ingot casting；Magnesium lithium alloy ingot casting component is Li 5.7-10.0%, Al by mass percentage 2.5-3.5%, Zn 1.2-2.0%, Y 0.1-0.3%, surplus are Mg and impurity；（6）Magnesium lithium alloy ingot casting is heated to 270-280 DEG C of insulation 6-8h, then water cooling to room temperature, completes Homogenization Treatments；（7）Strand is formed after magnesium lithium alloy after Homogenization Treatments is carried out face milling, constant temperature warm-rolling, warm-rolling are carried out to strand Temperature is 150-200 DEG C, overall reduction 60-80%, obtains warm-rolling magnesium lithium alloy plate；（8）Warm-rolling magnesium lithium alloy plate is heated to 270-280 DEG C of insulation at least 24h and completes solution treatment, is air-cooled to room temperature, then Room temperature tensile leveling processing is carried out, stretcher strain amount is 2-4%, obtains high-strength ultralight two phase structure magnesium lithium alloy plate.
- 2. the preparation method of high-strength ultralight two phase structure magnesium lithium alloy plate according to claim 1, it is characterised in that institute The coverture component stated contains LiCl 80 ± 1%, LiF 20 ± 1%, granularity 0.1-1mm by mass percentage.
- 3. the preparation method of high-strength ultralight two phase structure magnesium lithium alloy plate according to claim 1, it is characterised in that institute The refining agent component stated contains LiBr 20 ± 1%, LiCl 65 ± 1%, LiF 15 ± 1%, granularity 0.1-1mm by mass percentage.
- 4. the preparation method of high-strength ultralight two phase structure magnesium lithium alloy plate according to claim 1, it is characterised in that institute The mill speed for the warm-rolling stated is 1.5-2.5mm/s, and it is 10-20 passages to roll total passage, using reversible reciprocal rolling mode.
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| CN110144504A (en) * | 2019-06-26 | 2019-08-20 | 航天材料及工艺研究所 | Ultralight high-strength magnesium lithium alloy of one kind and preparation method thereof |
| CN111304506B (en) * | 2020-03-11 | 2021-08-03 | 上海交通大学 | Micro-nano TiB2Preparation method of particle-reinforced magnesium-lithium-based composite material |
| CN112593131B (en) * | 2020-12-29 | 2022-02-18 | 郑州轻研合金科技有限公司 | High-strength high-plasticity high-yield-ratio magnesium-lithium alloy and preparation method and application thereof |
| CN114540685B (en) * | 2022-04-28 | 2022-07-19 | 北京理工大学 | Anti-aging softening high-strength high-modulus corrosion-resistant two-phase magnesium-lithium alloy and preparation method thereof |
| CN115369339B (en) * | 2022-09-05 | 2023-05-26 | 航天科工(长沙)新材料研究院有限公司 | Heat treatment method for magnesium-lithium alloy die forging |
| CN115852183A (en) * | 2022-12-07 | 2023-03-28 | 上海云铸三维科技有限公司 | Smelting purification method of Mg-Li-Al-Zn-Y alloy for three-dimensional printing |
| CN116287917A (en) * | 2023-03-24 | 2023-06-23 | 西北有色金属研究院 | Light high-strength and high-toughness extruded Mg-Li-Al-TiB alloy and preparation method thereof |
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| CN1948532A (en) * | 2006-11-01 | 2007-04-18 | 中国科学院金属研究所 | Quasi crystal phase fortified magnesium lithium alloy and its preparation method |
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| CN1948532A (en) * | 2006-11-01 | 2007-04-18 | 中国科学院金属研究所 | Quasi crystal phase fortified magnesium lithium alloy and its preparation method |
| CN102505089A (en) * | 2011-12-26 | 2012-06-20 | 北京航空航天大学 | Biodegradable magnesium-lithium alloy material and preparation method thereof |
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