CN107557629A - A kind of Mg Li Ga alloys and its processing technology with anti-flammability - Google Patents
A kind of Mg Li Ga alloys and its processing technology with anti-flammability Download PDFInfo
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- CN107557629A CN107557629A CN201710875993.0A CN201710875993A CN107557629A CN 107557629 A CN107557629 A CN 107557629A CN 201710875993 A CN201710875993 A CN 201710875993A CN 107557629 A CN107557629 A CN 107557629A
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Abstract
The invention discloses it is a kind of can unprotect melting in atmospheric conditions Mg Li Ga alloys and its processing technology.By weight percentage, the composition of alloy is：Li:8.0‑14.0wt.%,Ga:1.0‑2.0wt.%,Sr:2.0‑8.0wt.%,Nd:0.1‑0.4wt.%,Gd:0.1‑0.2wt.%,Yb:0.1‑0.3wt.%,B:0.1 0.2wt.%, In:0.6 0.8wt.%, surplus are magnesium.This patent obtains the excellent Mg Li Ga antiflaming magnesium alloys of flame retardant effect by the method for alloying, and when the alloy is exposed in air at high temperature, and alloy surface can generate that a Rotating fields are fine and close and spreadability strong oxide and nitride film.These films are at high temperature solid-state and not volatile, can provide excellent protection, prevent the further oxidation of magnesium alloy fused mass, so as to realize the unprotect melting of magnesium lithium alloy in atmospheric conditions.Gained magnesium lithium alloy material has the mechanical property of traditional magnesium lithium alloy at room temperature, and the high heat transfer coefficient not possessed with traditional magnesium lithium alloy：110 120W/m.K, and the thermal conductivity coefficient of traditional material is 80W/m.K or so.
Description
Technical field
The present invention relates to technical field of alloy, specifically, is related to a kind of magnesium lithium alloy.
Background technology
By adding lithium metal into magnesium metal, it is set to possess low-density, high specific stiffness, the excellent mechanical of high specific strength
Performance and damping, the high damping properties of de-noising and radioresistance, electromagnetism interference performance, before representing the technology that magnesium alloy develops
Edge, it is referred to as following revolutionary material the most green.Magnesium lithium alloy is structural metallic materials most light at present, is also claimed
For ultralight magnesium alloy, density is 1.3-1.6 g/cm3.It has low-density, high specific strength and good plastic deformation ability etc.
Advantage.According to the difference of lithium content in magnesium lithium alloy, magnesium lithium alloy is generally divided into 3 types:Lithium content is less than 5.7wt.%'s
Alloy, this kind of alloy have close-packed hexagonal structure using solid solution of the lithium in magnesium as base;Lithium content is more than 10.3wt.% conjunction
Gold, the matrix of this kind of alloy is body-centered cubic tissue;Lithium content is 5.7-10.3wt.% alloy, and this kind of alloy has two-phase group
Knit.
Magnesium lithium alloy is so that its density is small, specific strength and specific stiffness are high, thermal conductivity is good, machining property is excellent and product
The advantages that recovery utilization rate is high, have ten in national defense industry and civilian commercial field, particularly Modern New e-business field
Point wide application prospect, it is considered to be one of this century most promising metal material.It is same big compared with aluminium alloy
Small new magnesium lithium alloy quality is only the half of aluminium alloy, but its specific strength is higher than aluminium alloy.In addition to ultralight characteristic, also
With good damping performance, the capability of electromagnetic shielding more prominent than ordinary magnesium alloy, further improve in addition magnesium alloy be not easy into
The shortcomings that row cold working, while also there is recuperability.Therefore, magnesium lithium alloy is subtracting for Aero-Space and weaponry coideal
Heavy material.The application of magnesium lithium alloy, can not only realize it is structure lightened, and can also vibration and noise reducing, shield electromagnetic interference, make
Spacecraft, the mobility of weaponry, accuracy and security and comfortableness are greatly improved.In addition, magnesium lithium alloy
Damping capacity it is excellent, be more than ten times of aluminium alloy, damping noise reduction effect is good, is had outstanding performance in terms of electromagnetic interference is shielded.
Today of energy shortage, magnesium lithium alloy have good application in the high automobile of structural member lightweight requirements, aerospace industry
Prospect, meanwhile, also there is huge development potentiality in fields such as 3C industries, communication, medicine equipments.
In melting and forming process oxidation easily occurs for magnesium lithium alloy, burning is even exploded, the not only shaping to part
Damaged with performance, also easily injure human body and pollution environment.One important directions of magnesium lithium alloy industrialization are exactly such as
What prevents the oxidizing fire under its high temperature.At present frequently with chlorate flux protection method and inert gas shielding in metallurgy industry
Method.But both approaches have the defects of it is difficult to avoid that, such as it is also easy to produce toxic gas pollution environment and causes flux to be mingled with
And damage alloy property.In addition, melting, casting equipment and complex process, increase cost.Solve magnesium lithium alloy to melt in an atmosphere
Another approach that burning is produced during refining is that alloying element is added into magnesium lithium alloy, reaches fire-retardant mesh by the method for alloying
's.Its mechanism of alloying ignition-proof method is that specific alloying element is added in magnesium lithium alloy fusion process to influence alloy oxidation
Thermodynamics and dynamics process, dense oxidation film and nitride film with protective effect are formed, reach and prevent alloy vigorous oxidation
Substantially reduced with the tendency of the purpose of nitridation, and oxidizing fire of the magnesium lithium alloy during following process, so as to improve magnesium
The process safety of lithium alloy.
But as a kind of structural material, only there is fire resistance during melting can far can not meet requirement, more
It is important that final magnesium lithium alloy product will also possess gratifying mechanical strength simultaneously, at least conventional magnesium lithium can be reached
The mechanical property of alloy is horizontal.Be and Ca is the alloying element with good flame retardant effect found earliest, but containing Be's and Ca
Fire-retardant magnesium lithium alloy main bottleneck is to be difficult to the contradiction for solving between flame retardant effect and mechanical property.It is certain fire-retardant when reaching
During effect, excessive Be and Ca can seriously damage the mechanical property of magnesium alloy again.In addition, Be or Be compound has very strong poison
Property, it is totally unfavorable to human body and environment.In addition, the surface protection film power of regeneration of antiflaming magnesium alloy containing Ca is poor, once destruction, just lose
Deprotection acts on, and the burning velocity of the magnesium alloy containing Ca is also faster than pure magnesium.
The present situation that this patent is directed to magnesium lithium alloy under current high temperature and needs protect melting in melting provides one kind
The solution of novel materials.The excellent Mg-Li-Ga antiflaming magnesium alloys of flame retardant effect are obtained by the method for alloying,
Realize the unprotect melting of magnesium lithium alloy in atmospheric conditions.When the alloy is exposed in air at high temperature, alloy table
Face can generate one layer of oxide and nitride film.These membrane structures are fine and close, and spreadability is strong, for solid-state and are not easy to wave at high temperature
Hair, can provide excellent protection, prevent the further oxidation of magnesium alloy fused mass.Gained magnesium lithium alloy material has traditional magnesium lithium
Mechanical property under Alloy At Room Temperature, and the high heat transfer coefficient not possessed with traditional magnesium lithium alloy.The smooth industrialization of the alloy
It is expected to the structural member lightweight to industrial circle to play a role in promoting, also causes the operating temperature of correlation module because heat transfer is
Several raisings can further increase.
The content of the invention
A kind of present invention aims to overcome that the deficiencies in the prior art, there is provided Mg-Li-Ga magnesium lithium alloys with anti-flammability
And its processing technology.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of Mg-Li-Ga magnesium lithium alloys between 680-780 degree with fire resistance energy during melting.Percentage by weight
Than meter, the composition of alloy is：Li: 8.0-14.0wt.%, Ga: 1.0-2.0wt.%,Sr: 2.0-8.0wt.%,Nd: 0.1-
0.4wt.%, Gd: 0.1-0.2wt.%, Yb: 0.1-0.3wt.%, B:0.1-0.2wt.%, In:0.6-0.8wt.%, it is remaining
Measure as magnesium.The weight that the magnesium lithium alloy loses in fusion process because of the reason such as volatilization and formation clinker is in 2.0-4.0wt.%
Left and right.
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 680-780 degree, and utilizes electromagnetic agitation
Effect is sufficiently stirred 10 minutes or so.Alloy liquid is cast to waterglass mould after the insulation of 680-780 degree stands 10 minutes
Interior carry out casting.Ingot casting is subjected to deformation process at room temperature, amount is 15-20% under every time rolling.Every 3 passes
Need to carry out an intermediate heat-treatment to eliminate processing hardening, technique is：230 degree, 1.2 hours.At final heat after rolling
Science and engineering skill is：Vacuum solid solution handles 360 degree, 8.5 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 is directed to magnesium lithium alloy under current high temperature and needs protect melting in melting provides one
The solution of kind novel materials.The fire-retardant magnesium of the excellent Mg-Li-Ga of flame retardant effect is obtained by the method for alloying to close
Gold, realize the unprotect melting of magnesium lithium alloy in atmospheric conditions.When the alloy is exposed in air at high temperature, alloy
Surface can generate one layer of oxide and nitride film.These membrane structures are fine and close, and spreadability is strong, for solid-state and are not easy to wave at high temperature
Hair, can provide excellent protection, prevent the further oxidation of magnesium alloy fused mass.
（2）The alloy has low liquid-solid phase solidification temperature range, and hot cracking tendency is big when can solve to cast, casting cavity
With it is loose obvious, melt treatment is extensive, of poor quality, hot cracking tendency is big, casting character is poor, and product yield rate low and high temperature is strong
Spend the technical barrier such as low, waste product material and slag charge reuse difference.
（3）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%.And the high heat transfer system not possessed with traditional magnesium lithium alloy
Number：110-120 W/m.K, and the thermal conductivity coefficient of traditional material is 80 W/m.K or so.
（4）The alloy is stirred between 680-780 degree and in 5 hours under atmospheric environment, the melt treatment such as refining
Without obvious burning phenomenon, and the weight that the magnesium lithium alloy loses in fusion process because of the reason such as volatilization and formation clinker occurs
Amount is in 2.0-4.0wt.% or so.Smelting processing method is simple, and production cost reduces the requirement to equipment, also reduced than relatively low
Production cost and environmentally friendly cost, it is easy to industrialize large-scale application.The present invention can be used for manufacture temperature in use be 100 degree with
Lower structural member simultaneously has highly significant light weight effect.
Embodiment
Embodiment 1
A kind of Mg-Li-Ga magnesium lithium alloys of fire resistance when there is 730 degree of meltings.By weight percentage, alloy chemistry into
It is divided into：Li: 8.9wt.%, Ga: 1.6wt.%,Sr: 4.6wt.%,Nd: 0.2wt.%, Gd: 0.1wt.%, Yb:
0.2wt.%, B:0.1wt.%, In:0.6wt.%, surplus are magnesium.The preparation method of alloy：As above the raw material matched is added
In electric induction furnace under to atmospheric environment, and use silicon carbide crucible.Sensing heating forms alloy solution, and utilize to 730 degree
Galvanomagnetic-effect is sufficiently stirred 10 minutes or so.Alloy liquid is cast in waterglass mould for 10 minutes in 730 degree of insulations and carried out
Casting.Ingot casting is subjected to deformation process at room temperature, amount is 16% under every time rolling.Every 3 passes need carry out one
Secondary intermediate heat-treatment is hardened to eliminate processing, and technique is：230 degree, 1.2 hours.Final Heat Treatment Process after rolling is：Very
360 degree, 8.5 hours of empty solution treatment；Vacuum aging handles 140 degree, 2.8 hours.The material has the power of traditional magnesium lithium alloy
Learn performance：Modulus of elasticity is 54GPa, yield strength 98MPa, tensile strength 149MPa, elongation percentage 8%.And with tradition
The high heat transfer coefficient that magnesium lithium alloy does not possess：112 W/m.K, and the thermal conductivity coefficient of traditional material is 80 W/m.K or so.The conjunction
Gold in 730 degree and 5 hours between stirred under atmospheric environment, the melt treatment such as refining shows without the obvious scaling loss of generation
As, and material raw material proportion of goods damageds caused by evaporating and being formed due to clinker can be controlled in 2.9wt.% or so.
Embodiment 2
A kind of Mg-Li-Ga magnesium lithium alloys of fire resistance when there is 720 degree of meltings.By weight percentage, alloy chemistry into
It is divided into：Li: 8.6wt.%, Ga: 1.2wt.%,Sr: 7.3wt.%,Nd: 0.2wt.%, Gd: 0.1wt.%, Yb:
0.2wt.%, B:0.1wt.%, In:0.6wt.%, surplus are magnesium.The preparation method of alloy：As above the raw material matched is added
In electric induction furnace under to atmospheric environment, and use silicon carbide crucible.Sensing heating forms alloy solution, and utilize to 720 degree
Galvanomagnetic-effect is sufficiently stirred 10 minutes or so.Alloy liquid is cast in waterglass mould for 10 minutes in 720 degree of insulations and carried out
Casting.Ingot casting is subjected to deformation process at room temperature, amount is 16% under every time rolling.Every 3 passes need carry out one
Secondary intermediate heat-treatment is hardened to eliminate processing, and technique is：230 degree, 1.2 hours.Final Heat Treatment Process after rolling is：Very
360 degree, 8.5 hours of empty solution treatment；Vacuum aging handles 140 degree, 2.8 hours.The material has the power of traditional magnesium lithium alloy
Learn performance：Modulus of elasticity is 54GPa, yield strength 98MPa, tensile strength 149MPa, elongation percentage 8%.And with tradition
The high heat transfer coefficient that magnesium lithium alloy does not possess：113 W/m.K, and the thermal conductivity coefficient of traditional material is 80 W/m.K or so.The conjunction
Gold in 720 degree and 5 hours between stirred under atmospheric environment, the melt treatment such as refining shows without the obvious scaling loss of generation
As, and material raw material proportion of goods damageds caused by evaporating and being formed due to clinker can be controlled in 2.1wt.% or so.
Embodiment 3
A kind of Mg-Li-Ga magnesium lithium alloys of fire resistance when there is 690 degree of meltings.By weight percentage, alloy chemistry into
It is divided into：Li: 11.3wt.%, Ga: 1.9wt.%,Sr: 4.2wt.%,Nd: 0.3wt.%, Gd: 0.2wt.%, Yb:
0.1wt.%, B:0.1wt.%, In:0.6wt.%, surplus are magnesium.The preparation method of alloy：As above the raw material matched is added
In electric induction furnace under to atmosphere protection, and use silicon carbide crucible.Sensing heating forms alloy solution, and utilize to 690 degree
Galvanomagnetic-effect is sufficiently stirred 10 minutes or so.Alloy liquid is cast in waterglass mould for 10 minutes in 690 degree of insulations and carried out
Casting.Ingot casting is subjected to deformation process at room temperature, amount is 16% under every time rolling.Every 3 passes need carry out one
Secondary intermediate heat-treatment is hardened to eliminate processing, and technique is：230 degree, 1.2 hours.Final Heat Treatment Process after rolling is：Very
360 degree, 8.5 hours of empty solution treatment；Vacuum aging handles 140 degree, 2.8 hours.The material has the power of traditional magnesium lithium alloy
Learn performance：Modulus of elasticity is 54GPa, yield strength 98MPa, tensile strength 149MPa, elongation percentage 8%.And with tradition
The high heat transfer coefficient that magnesium lithium alloy does not possess：119 W/m.K, and the thermal conductivity coefficient of traditional material is 80 W/m.K or so.The conjunction
Gold in 690 degree and 5 hours between stirred under atmospheric environment, the melt treatment such as refining shows without the obvious scaling loss of generation
As, and material raw material proportion of goods damageds caused by evaporating and being formed due to clinker can be controlled in 3.9wt.% or so.
Claims (3)
- A kind of 1. Mg-Li-Ga magnesium lithium alloys in melting with fire resistance energy, it is characterised in that by weight percentage, The chemical composition of alloy is：Li: 8.0-14.0wt.%, Ga: 1.0-2.0wt.%,Sr: 2.0-8.0wt.%,Nd: 0.1- 0.4wt.%, Gd: 0.1-0.2wt.%, Yb: 0.1-0.3wt.%, B:0.1-0.2wt.%, In:0.6-0.8wt.%, it is remaining Measure as magnesium.
- 2. the preparation method of Mg-Li-Ga magnesium lithium alloys according to claim 1, it is characterised in that the method for smelting bag of alloy Containing following steps：As above the raw material matched is added in the electric induction furnace under atmospheric environment, and uses silicon carbide crucible；Sensing 680-780 degree is heated to, forms alloy solution, and be sufficiently stirred 10 minutes or so using galvanomagnetic-effect；Alloy liquid is existed 680-780 degree is incubated 10 minutes and is cast to progress casting in waterglass mould.
- 3. the preparation method of Mg-Li-Ga magnesium lithium alloys according to claim 1, it is characterised in that include following procedure of processing： Ingot casting is subjected to deformation process at room temperature, amount is 15-20% under every time rolling；Every 3 passes need to carry out among once Heat treatment is hardened to eliminate processing, and technique is：230 degree, 1.2 hours；Final Heat Treatment Process after rolling is：Vacuum solid solution 360 degree, 8.5 hours of processing；Vacuum aging handles 140 degree, 2.8 hours.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109161763A (en) * | 2018-10-31 | 2019-01-08 | 广州宇智科技有限公司 | With the magnesium alloy and its technique of substitution AM material on a kind of new automobile components |
| CN110983135A (en) * | 2019-12-10 | 2020-04-10 | 北京科技大学 | High-strength high-plasticity Mg-Ga-Li magnesium alloy capable of being rapidly aged and strengthened and preparation method thereof |
| WO2023048784A3 (en) * | 2021-06-07 | 2023-08-17 | University Of Florida Research Foundation, Inc. | Magnesium-lithium alloys composed of gallium or indium |
-
2017
- 2017-09-25 CN CN201710875993.0A patent/CN107557629A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109161763A (en) * | 2018-10-31 | 2019-01-08 | 广州宇智科技有限公司 | With the magnesium alloy and its technique of substitution AM material on a kind of new automobile components |
| CN110983135A (en) * | 2019-12-10 | 2020-04-10 | 北京科技大学 | High-strength high-plasticity Mg-Ga-Li magnesium alloy capable of being rapidly aged and strengthened and preparation method thereof |
| CN110983135B (en) * | 2019-12-10 | 2021-02-26 | 北京科技大学 | High-strength high-plasticity Mg-Ga-Li magnesium alloy capable of being rapidly aged and strengthened and preparation method thereof |
| WO2023048784A3 (en) * | 2021-06-07 | 2023-08-17 | University Of Florida Research Foundation, Inc. | Magnesium-lithium alloys composed of gallium or indium |
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