CN107868897A - A kind of magnesium lithium alloy with extremely excellent die casting performance - Google Patents
A kind of magnesium lithium alloy with extremely excellent die casting performance Download PDFInfo
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- CN107868897A CN107868897A CN201711310846.5A CN201711310846A CN107868897A CN 107868897 A CN107868897 A CN 107868897A CN 201711310846 A CN201711310846 A CN 201711310846A CN 107868897 A CN107868897 A CN 107868897A
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- alloy
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- magnesium lithium
- lithium alloy
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- 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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- 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
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- 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
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- 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
Abstract
The invention discloses a kind of magnesium lithium alloy and its processing technology between 700 800 degree with extremely excellent die casting performance during melting.By weight percentage, the chemical composition of alloy is：Li:3.0‑6.0wt.%,Ba:0.5‑1.2wt.%,Al:2.0‑3.0wt.%,Ge:1.0‑1.5wt.%,In:0.5‑0.8wt.%,Er:0.1‑0.2wt.%,Dy:0.2‑0.4wt.%,B:0.3 0.8wt.%, surplus are magnesium.The magnesium lithium alloy material has good casting character, the compression casting being suitable under the protective atmosphere of thin-walled parts.Particularly it is adapted to casting to require the lightweight structural material for possessing lightweight feature, there are huge market prospects.
Description
Technical field
The present invention relates to technical field of alloy, specifically, is related to a kind of magnesium lithium alloy.
Background technology
Magnesium alloy has that density is small, thermal diffusivity is good, specific strength and specific stiffness are high, capability of electromagnetic shielding is good and abundant raw material etc.
Advantage, in fields such as aviation day, automobiles, oneself has longer applicating history.But magnesium alloy is hcp structures, plastic deformation ability compared with
Difference, which greatly limits its performance and application.The density of magnesium and lithium is respectively 1.73,0.53 gram/
Cubic centimetre.After lithium is added into magnesium alloy, not only the density of alloy can be made further to reduce, but also can obtain its processing characteristics
To very big improvement.Magnesium lithium alloy is the specific alloy that structural metallic materials Midst density is minimum, most light, is referred to as ultralight conjunction in the industry
Gold.Most light can floating on is waterborne, turns into floating on water surface alloy.When lithium content is less than 5. 7wt.%, magnesium lithium alloy is by single
Hcp phase compositions；When lithium content is higher than 10.3wt%, magnesium lithium alloy is by single bcc phase compositions；And when lithium content is located at 5.
When between 7-10.3wt.%, magnesium lithium alloy is by the phase compositions of hcp+bcc two.On the one hand lithium can reduce the c/a axles ratio of magnesium lattice,
Improve the symmetry of close-packed hexagonal lattice.On the other hand, when lithium content is higher, it will appear from body-centered cubic phase.Therefore, magnesium lithium alloy
Plastic deformation ability to be substantially better than common magnesium alloy.
As the world today increasingly carries to what structural material lightweight, loss of weight energy-saving and environmental protection and sustainable development required
Height, magnesium lithium alloy is before needing the fields such as the traffic of lightweight structure material, electronics, medical product to show wide application
Scape.Magnesium lithium alloy has a series of no features of magnesium alloy.High specific strength and specific stiffness；Anti- high energy particle penetration capacity
By force, capability of electromagnetic shielding is excellent；Cryogenic mechanics performance and machinability are good；New magnesium lithium alloy, onesize, weight only has
The half of aluminium alloy, but specific strength is higher than aluminium alloy.Compared with aluminium alloy, its energy loss of weight 40-50wt.%, with general magnesium alloy phase
Than energy loss of weight 20-30wt.%；Damping capacity is excellent, and attenuation coefficient is more than ten times of aluminium alloy, and damping noise reduction effect is good, is being shielded
Had outstanding performance in terms of covering electromagnetic interference.Magnesium lithium alloy has extensive use in fields such as electronic product, medicine equipment, outdoor equipments
On the way, such as shell of notebook computer, mobile phone, video camera, camera, requires lightness.Magnesium lithium alloy has been enter into automobile system
Field is made, applies to steering wheel, instrument board etc..In addition, such as communication base station, fin, camera crane, use magnesium lithium alloy
If manufacture, many weight can be mitigated.
But lithium belongs to active element, be easy to carry out violent reaction with oxygen or nitrogen under atmospheric environment and
Produce burning or blast.It is usual in traditional in order to prevent the oxidizing fire of magnesium lithium melt in magnesium lithium alloy smelting process
Using protective gas or flux protection melting.（1）Gas shield melting：Gas shield melting typically refer in fusion process
Magnesium lithium alloy bath surface fills inert gas or the gas for generating fine and close diaphragm can be reacted with magnesium lithium alloy, so that every
Oxygen in exhausted air.(2) flux protection melting：The flux of melting magnesium lithium alloy has covering effect.The flux of melting is by table
The effect of face tension force, continuous, complete coating is formed in bath surface.Completely cut off air, prevent magnesium lithium alloy and oxygen in air
The reaction of gas and water point, it is therefore prevented that the oxidation of lithium.But the use of both approaches all because its exist be difficult to avoid that the defects of and
It is restricted.Such as it is also easy to produce toxic gas pollution environment and causes flux to be mingled with and damage alloy property.And flux is mingled with
The source of corrosion of product in use is easily become, accelerated material corrosion, reduces service life.In addition, the villaumite in flux
With villiaumite is volatile at high temperature produces some severe corrosive gases, destroy factory building, equipment and ecological environment.
Alloy compression casting is to utilize additional pressure, by the certain thermograde of mould, allows casting by the solidifying of setting
Gu direction solidifies, the supplement of melt is obtained in time with sharp casting.Along with board, mould reasonably designs, stoker, the person of pouring
Correct operation, can just cast out preferable casting.But when magnesium lithium alloy fills type and feeding is cast, melt fills type mistake
Turbulent flow is easily produced in journey, makes the easy volume gas of aluminium alloy and oxidation, therefore pin hole, stomata and folder are easily produced in Mg alloy castings
The defects of miscellaneous.
The invention provides a kind of with the magnesium lithium conjunction with extremely excellent casting character during melting between 700-800 degree
Gold, and there is the mechanical property of existing magnesium lithium alloy in the alloy final products of this temperature range melting.The magnesium lithium alloy has
Low liquid-solid phase solidification temperature range, hot cracking tendency is big when can solve to cast, and casting is empty and loose obvious, melt treatment work
Skill is extensive, of poor quality, hot cracking tendency is big, casting character is poor, product yield rate low and high temperature low intensity, waste product material and slag charge reuse
The technical barriers such as property difference.Meanwhile the magnesium lithium alloy material is suitable for the compression casting under the protective atmosphere of thin-walled parts, particularly
It is adapted to casting to require the lightweight structural material for possessing lightweight feature, there are huge market prospects.
The content of the invention
Present invention aims to overcome that the deficiencies in the prior art, there is provided a kind of magnesium lithium with extremely excellent die casting performance closes
Gold and its processing technology.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of magnesium lithium alloy between 700-800 degree with extremely excellent die casting performance during melting.By weight percentage
Meter, the composition of alloy are：Li:3.0-6.0wt.%,Ba:0.5-1.2wt.%,Al:2.0-3.0wt.%,Ge:1.0-1.5wt.%,
In:0.5-0.8wt.%,Er:0.1-0.2wt.%,Dy:0.2-0.4wt.%,B:0.3-0.8wt.%, surplus are magnesium.The magnesium lithium closes
The weight that gold loses in fusion process because of the reason such as volatilization and formation clinker is in 2.0-5.0wt.% or so.
The preparation method of above-mentioned magnesium lithium alloy, comprises the following steps：As above the raw material matched is added under atmospheric environment
Electric induction furnace in, and use silicon carbide crucible.Sensing heating forms alloy solution to 700-800 degree, and utilizes electromagnetic agitation
Effect is sufficiently stirred 10 minutes or so.Alloy liquid is cast to heat top same level after the insulation of 700-800 degree stands 10 minutes
Semi-continuous casting is carried out in equipment, it is 10-14m/min that ingot casting, which moves down speed,.The ingot casting can regard cast raw material and be used for subsequently
The compression casting of process prepares the magnesium lithium alloy casting of complicated shape.The last heat treatment step of these casting is：Vacuum is consolidated
It is molten to handle 420 degree, 2.5 hours；Vacuum aging handles 140 degree, 2.8 hours.
Compared with prior art, the present invention has the advantages that：
（1）The present situation that patent of the present invention can't fully meet existing demand for the casting character of current magnesium lithium alloy provides
A kind of novel materialogy solution.By the materialogy method of novelty come the element species and content in preferred alloy,
Products obtained therefrom can not only substantially reduce the shortcomings that alloying element usage amount, can also obtain extraordinary casting character and excellent
Yield of alloy.
（2）The magnesium lithium alloy has and its excellent fire resistance under atmospheric environment during smelting.Its mechanism is in magnesium
Specific alloying element is added in lithium alloy fusion process to influence the thermodynamical reaction of alloy oxidation and dynamic process, is formed
Dense oxidation film and nitride film with protective effect, reach the purpose for preventing alloy vigorous oxidation and nitridation.
（3）The magnesium lithium alloy casting character that this patent proposes is very excellent.And there is good fluidity, filling performance is favourable,
The advantages that shrinkage cavity formability is small, and molten metal is inspiratory small.It can produce the thin of high dimensional accuracy and low surface roughness
Wall casting, die casting wall thickness can reach the casting that minimum wall thickness (MINI W.) is 2mm, can cast out a diameter of 0.5 mm or so aperture, and one
As magnesium alloy under the conditions of compression casting, it is 3mm that can only cast out minimum wall thickness (MINI W.), minimum-value aperture 1mm casting.
（4）The magnesium alloy is refined crystal grain after Li is added.In addition, the alloy has low liquid-solid phase solidification temperature
Scope is spent, hot cracking tendency is big when can solve to cast, the technical barriers such as the empty and loose obvious product yield rate of casting is low.Smelt
Processing method is simple, and production cost is reduced to equipment requirement than relatively low.So that alloy service life is further improved,
It is easy to industrialize large-scale application.
（5）The material has the mechanical property of traditional magnesium lithium alloy：Modulus of elasticity is 50-70GPa, yield strength 90-
120MPa, tensile strength 140-160MPa, elongation percentage 6-18%.The magnesium lithium alloy is in fusion process because volatilization and formation
The reasons such as clinker and the weight lost is less than 5.0wt.% or so.
Embodiment
Embodiment 1
It is a kind of with magnesium lithium alloy of 710 degree of meltings with extremely excellent die casting performance.By weight percentage, chemical composition
For：Li:4.8wt.%,Ba:0.9wt.%,Al:2.4wt.%,Ge:1.3wt.%,In:0.6wt.%,Er:0.1wt.%,Dy:
0.2wt.%,B:0.3-0.8wt.%, surplus are magnesium.The preparation method of alloy：As above the raw material matched is added to atmospheric environment
Under electric induction furnace in, and use silicon carbide crucible.Sensing heating forms alloy solution, and fill using galvanomagnetic-effect to 710 degree
Divide stirring 10 minutes or so.By alloy liquid 710 degree of insulations be cast within 10 minutes in the same level equipment of heat top carry out it is semicontinuous
Casting, it is 12m/min that ingot casting, which moves down speed,.The ingot casting can regard cast raw material and be prepared for the compression casting of subsequent handling
The magnesium lithium alloy casting of complicated shape.The last heat treatment step of these casting is：Vacuum solid solution handles 420 degree, 2.5 hours；
Vacuum aging handles 140 degree, 2.8 hours.The material has the mechanical property of traditional magnesium lithium alloy：Modulus of elasticity is 63GPa, is bent
It is 97MPa to take intensity, tensile strength 154MPa, elongation percentage 12%.The magnesium lithium alloy is in fusion process because volatilization and formation
The reasons such as clinker and the weight lost is less than 5.0wt.% or so.
Embodiment 2
It is a kind of with magnesium lithium alloy of 740 degree of meltings with extremely excellent die casting performance.By weight percentage, chemical composition
For：Li:5.8wt.%,Ba:0.9wt.%,Al:2.4wt.%,Ge:1.3wt.%,In:0.6wt.%,Er:0.1wt.%,Dy:
0.3wt.%,B:0.6wt.%, surplus are magnesium.The preparation method of alloy：As above the raw material matched is added under atmospheric environment
In electric induction furnace, and use silicon carbide crucible.Sensing heating forms alloy solution, and fully stir using galvanomagnetic-effect to 740 degree
Mix 10 minutes or so.Alloy liquid is cast in the same level equipment of heat top for 10 minutes in 740 degree of insulations and carries out semi-continuous casting,
It is 13m/min that ingot casting, which moves down speed,.The ingot casting can regard cast raw material and prepare complexity for the compression casting of subsequent handling
The magnesium lithium alloy casting of shape.The last heat treatment step of these casting is：Vacuum solid solution handles 420 degree, 2.5 hours；Vacuum
140 degree, 2.8 hours of Ageing Treatment.The material has the mechanical property of traditional magnesium lithium alloy：Modulus of elasticity is 64GPa, and surrender is strong
Spend for 106MPa, tensile strength 153MPa, elongation percentage 12%.The magnesium lithium alloy is in fusion process because volatilization and formation stove
The reasons such as slag and the weight lost is less than 5.0wt.% or so.
Embodiment 3
It is a kind of with magnesium lithium alloy of 790 degree of meltings with extremely excellent die casting performance.By weight percentage, chemical composition
For：Li:4.6wt.%,Ba:0.8wt.%,Al:2.4wt.%,Ge:1.3wt.%,In:0.6wt.%,Er:0.1wt.%,Dy:
0.3wt.%,B:0.6wt.%, surplus are magnesium.The preparation method of alloy：As above the raw material matched is added under atmospheric environment
In electric induction furnace, and use silicon carbide crucible.Sensing heating forms alloy solution, and fully stir using galvanomagnetic-effect to 790 degree
Mix 10 minutes or so.Alloy liquid is cast in the same level equipment of heat top for 10 minutes in 790 degree of insulations and carries out semi-continuous casting,
It is 12m/min that ingot casting, which moves down speed,.The ingot casting can regard cast raw material and prepare complexity for the compression casting of subsequent handling
The magnesium lithium alloy casting of shape.The last heat treatment step of these casting is：Vacuum solid solution handles 420 degree, 2.5 hours；Vacuum
140 degree, 2.8 hours of Ageing Treatment.The material has the mechanical property of traditional magnesium lithium alloy：Modulus of elasticity is 64GPa, and surrender is strong
Spend for 108MPa, tensile strength 153MPa, elongation percentage 12.4%.The magnesium lithium alloy is in fusion process because volatilization and formation
The reasons such as clinker and the weight lost is less than 5.0wt.% or so.
Claims (3)
1. a kind of magnesium lithium alloy with extremely excellent die casting performance in 700-800 degree meltings, it is characterised in that by weight hundred
Divide and be than meter, the chemical composition of alloy：Li:3.0-6.0wt.%,Ba:0.5-1.2wt.%,Al:2.0-3.0wt.%,Ge:1.0-
1.5wt.%, In:0.5-0.8wt.%,Er:0.1-0.2wt.%,Dy:0.2-0.4wt.%,B:0.3-0.8wt.%, surplus are magnesium.
2. the preparation method of magnesium lithium alloy according to claim 1, it is characterised in that the preparation method of alloy includes following step
Suddenly：As above the raw material matched is added in the electric induction furnace under atmospheric environment, and uses silicon carbide crucible, sensing heating arrives
700-800 degree forms alloy solution, and is sufficiently stirred 10 minutes or so using electromagnetic agitation effect, by alloy liquid in 700-
800 degree of insulations are cast in the same level equipment of heat top after standing 10 minutes and carry out semi-continuous casting, and it is 10- that ingot casting, which moves down speed,
14m/min。
3. the application method of magnesium lithium alloy according to claim 1, it is characterised in that include following procedure of processing：The ingot casting can
To be used for the compression casting of subsequent handling as cast raw material to prepare the magnesium lithium alloy casting of complicated shape, these casting are most
Heat treatment step is afterwards：Vacuum solid solution handles 420 degree, 2.5 hours；Vacuum aging handles 140 degree, 2.8 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711310846.5A CN107868897A (en) | 2017-12-11 | 2017-12-11 | A kind of magnesium lithium alloy with extremely excellent die casting performance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711310846.5A CN107868897A (en) | 2017-12-11 | 2017-12-11 | A kind of magnesium lithium alloy with extremely excellent die casting performance |
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| Publication Number | Publication Date |
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| CN107868897A true CN107868897A (en) | 2018-04-03 |
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| CN201711310846.5A Withdrawn CN107868897A (en) | 2017-12-11 | 2017-12-11 | A kind of magnesium lithium alloy with extremely excellent die casting performance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3770288A4 (en) * | 2018-04-23 | 2021-12-22 | Canon Kabushiki Kaisha | Magnesium-lithium-based alloy |
| CN115161525A (en) * | 2022-06-10 | 2022-10-11 | 北京理工大学 | High-strength high-elasticity modulus rare earth single-phase magnesium-lithium alloy and preparation method thereof |
-
2017
- 2017-12-11 CN CN201711310846.5A patent/CN107868897A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3770288A4 (en) * | 2018-04-23 | 2021-12-22 | Canon Kabushiki Kaisha | Magnesium-lithium-based alloy |
| US11840749B2 (en) | 2018-04-23 | 2023-12-12 | Canon Kabushiki Kaisha | Magnesium-lithium-based alloy |
| CN115161525A (en) * | 2022-06-10 | 2022-10-11 | 北京理工大学 | High-strength high-elasticity modulus rare earth single-phase magnesium-lithium alloy and preparation method thereof |
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Application publication date: 20180403 |
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