CN109082570A - A kind of no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique - Google Patents
A kind of no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique Download PDFInfo
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- CN109082570A CN109082570A CN201811093195.3A CN201811093195A CN109082570A CN 109082570 A CN109082570 A CN 109082570A CN 201811093195 A CN201811093195 A CN 201811093195A CN 109082570 A CN109082570 A CN 109082570A
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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
- 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
- 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
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Abstract
The invention discloses a kind of no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its techniques.According to weight percent, the ingredient of the alloy are as follows: Li:0.6-0.8wt.%, Sb:2.0-3.0wt.%, In:5.0-8.0wt.%, Bi:4.0-6.0wt.%, Pb:1.0-2.0wt.%, Ge:3.0-5.0wt.%, Si:1.2-1.5wt.%, Sn:5.0-8.0wt.%, surplus are magnesium.The magnesium alloy not only can effectively eliminate casting flaw, casting hole and loose formation be reduced, it is also possible that alloy-steel casting has excellent mechanical property.Thus, which provides a kind of lightweight solution of magnesium alloy substitute products, and in the update and industrial upgrading demand implemented with effectively push China's new material in industrialization process.
Description
Technical field
The present invention relates to technical field of alloy, specifically, being related to a kind of magnesium alloy.
Background technique
Magnesium is one of the most abundant light metal alloy of reserves on the earth, is inexhaustible.Magnesium alloy is based on magnesium
The alloy of other element compositions is added.Its main feature is that: density is small, and specific strength is high, and elasticity modulus is big, and absorb shock resistance is good, absorbs impact
Load-carrying ability is bigger than aluminium alloy, corrosion resistance and good.Magnesium alloy specific gravity belongs to most less serious case, magnesium alloy in all structure alloys
Specific strength be apparently higher than aluminium alloy and steel, specific stiffness is suitable with aluminium alloy and steel.In elastic range, magnesium alloy is impacted
When load, the energy ratio Al-alloy parts of absorption are big, so magnesium alloy has good antidetonation noise abatement performance.Furthermore it is possible to provide
Superior anti-electromagnetic protection effect, especially magnesium alloy case can fully absorb the electromagnetic interference that frequency is more than 100db.At present
There are camera, video camera, digital camera, laptop, mobile phone, TV with the electric equipment products of magnesium alloy production components
Machine, plasma display, hard disk drive etc..
Traditionally, limitation magnesium alloy is in the principal element of engineering field: 1) strength of materials is relatively low, and especially high temperature is strong
Degree and creep-resistant property are poor；2) resistance to corrosion of material is poor, is easy to fail by the corrosion of environment in extreme circumstances；
3) Mg alloy castings shrinkage porosite easy to form and fire check, yield rate is low, and the control of magnesium alloy deformation part plastic processing condition is difficult, leads
Cause tissue and unstable mechanical property.Developing material personnel both domestic and external and company have carried out permanent grind to these problems
Study carefully and diplomatizes.It has passed through more than 20 years exploration and developments, intensity of the related fields both domestic and external in magnesium alloy materials, high-temperature behavior
Have been achieved for great breakthrough with corrosion-resistant aspect, have developed a series of high-strength magnesium alloy, high temperature resistant magnesium alloy and
Corrosion-resistant magnesium alloy, and just promoted on a large scale in relevant application field.But cast magnesium alloy casting is easy to form
The problem of shrinkage porosite and fire check, both at home and abroad never ideal solution.
In the frame of alloy material design, loose be usually used with hole is connect during solving the problems, such as cast
The material composition of nearly complex magnesium alloy eutectic point solves.Since the alloy of eutectic point is with constant setting temperature, thus
The ingredient of casting can be made to keep uniformly in a wide range of in casting process, and reduce solidification hole and loose as far as possible
Formation.This mentality of designing achieves very big success in the actual operation process, and has developed a series of casting and use
Polynary cast magnesium alloy.But since alloying component has been limited near multi-element eutectic point, thus alloy other performance is not
Great optimization space.The magnesium alloy for causing casting in practice is not poor mechanical property, be exactly physical property or its
Its characteristic is not able to satisfy the requirement used.
In the design field of multicomponent alloy, two different melts are generated by the spinodal decomposition effect of liquid phase, and are made
Obtaining both melts to have very big fusing point difference is that another eliminate casts hole and loose novel method.In the solidifying of alloy
Gu during, dystectic liquid phase is first solidified, and the casting hole of generation can pass through the method for the compensating liquid of low melting point
To carry out the densification of ingot casting.Since the liquid phase spinodal decomposition of alloy can be realized in sizable composition range, thus material
Material designer can further increase the other performance of material by constantly adjusting alloying element and content.This design side
Method is undoubtedly very advanced, and more can solve practical problem compared to the design of eutectic point alloy in practice.But make us losing
Regret, in field of magnesium alloy, there is no the new products based on the design concept to occur both at home and abroad at present.
As the world today is increasingly mentioned to what structural material lightweight, loss of weight energy-saving and environmental protection and sustainable development required
Height, magnesium alloy need the fields exhibition such as the traffic of lightweight structure material, electronics, medical product show it is more extensive before
Scape.The innovation for carrying out Alloy Materials be unable to do without the structure and ingredient design of alloy, and the thermodynamics and kinetics of material are solutions
The certainly main method of such problem.It is determined, not only be can achieve required each by the screening of optimized alloy element and ingredient
Kind performance indicator, can also reduce the production cost of alloy smelting and processing and the requirement to equipment.The longevity is not used only in such product
Life has further raising, is also convenient for industrialization large-scale production.
Summary of the invention
The purpose of the present invention is to overcome the deficiency in the prior art, provides a kind of no solidification shrinkage characteristic high-rigidity cast magnesium
Alloy and its technique.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique.By weight percentage, the group of alloy becomes
Li:0.6-0.8wt.%,Sb:2.0-3.0wt.%,In:5.0-8.0wt.%,Bi:4.0-6.0wt.%,Pb:1.0-2.0wt.%,
Ge:3.0-5.0wt.%, Si:1.2-1.5wt.%, Sn:5.0-8.0wt.%, surplus are magnesium.
A kind of above-mentioned no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique, including the following steps: will be as above
The raw material of proportion is added in the electric induction furnace under ar gas environment, and uses graphite crucible;10 points are kept the temperature at 700 degree when melting
Clock, it is uniform by Efco-Northrup furnace electromagnetic agitation;1 minute, which is kept the temperature, at 700 degree after mixing evenly and is cast comes out of the stove;Alloy casting uses
The punching block of diameter 20-30mm, and cooled down by the way of water cooling.Resulting ingot casting is heated to 650-700 under protection of argon gas
It spends and keeps the temperature 10 minutes;Then the melt is poured into and carries out cast molding in the mold being ready for;Needed after cooling and demolding into
Row eliminates casting stress vacuum annealing, and temperature is 140 degree, and the time is 0.4 hour.
Compared with prior art, the invention has the following beneficial effects:
(1) it for alloy design, improves casting alloy compactness and reduces hole and loose method mainly using altogether
Temperature constancy of the peritectic alloy in solidification carries out.That is, if the setting temperature of alloy as pure metal, belongs to
In the temperature that some is fixed.Then the alloy is likely to have excellent coagulating property, and not only ingredient is uniform for gained ingot casting, Er Qiening
It solid hole hole can be seldom.So general casting magnesium alloy, a lot of ingredients are all near multi-element eutectic point.This is also the current world
With the common method of domestic magnesium alloy design.With increasingly developed, the use environment and condition of magnesium alloy of science and technology and industry
It is increasingly harsher.Thus, developing the casting not near eutectic point with magnesium alloy is current hot spot direction both domestic and external.This be because
Very big limitation is applied with to material for the ingredient near eutectic point, because having other superior physical properties and mechanical property
The alloying component of energy is not often near eutectic point.This patent, which proposes, a kind of carries out process of setting using liquid phase spinodal decomposition
The novel method that middle solidification hole is eliminated, and the alloy has the characteristic of constancy of volume in process of setting.Thus the alloy is not
It can only make the design of casting alloy far from the eutectic point of multicomponent alloy, also that alloying component carefully optimize to make
The alloy is obtained to be possibly realized with no solidification shrinkage characteristic and excellent mechanical property.
(2) the novel no solidification shrinkage magnesium alloy of this patent design, during solidification, the liquid phase of rich magnesium and rich bismuth
Also it is constantly separated from initial alloy melt.These rich magnesiums with the melt of rich bismuth due to not melting mutually mutually, thus solidifying
Gradually squeezed in the gap of dendrite during Gu along with the generation of dendrite, and the most final set in these narrow gaps
Gu playing the role of supplement solidification hole.Thus, the alloy for having liquid phase spinodal decomposition characteristic is most suitable for prepare no solidification
The casting of hole is shunk, because the defects of solidification hole of this material generation is few.For technical term, liquid alloy exists
Two kinds of mutually insoluble liquid phases are generated during solidification, the liquid phase of low melting point can compensate high-melting-point liquid phase in process of setting
The dendrite hole generated when solidification, thus physical property for casting and mechanical property have the function of it is extremely beneficial.
(3) novel magnesium alloy of present patent application protection has wide solidification temperature range (180-420 degree).Wherein
The solidification temperature range of main rich magnesium melt is 300-420 degree, and the solidification temperature range of rich bismuth is 180-200 degree.Two kinds of liquid
The solidification temperature range of phase covers the temperature range from 420 degree to 180 degree, thus when being cast with the alloy,
The cast member consistency that can be obtained is high, can achieve 98% or more and occurs without apparent hole.In addition, the alloy has
Extremely excellent reuse performance, the appearance profile of cast member is clear after 4 reuses, any surface finish.Thus, the industry of the material
Change, yield rate not only can be improved, production cost can also be substantially reduced by multiple reuse.
(4) material has extremely excellent casting character, can reach general under the conditions of the gravitational casting of argon gas protection
The final effect of logical magnesium alloy argon gas protection compression casting.The volume gas of molten metal flow process and process of setting in magnesium alloy
Contraction is the main reason for generating hole type flaw.Hole normally results in mechanical castings decline, and can not carry out
Heat treatment, and the resistance to pressure and air-tightness of casting can be reduced, to limit the expansion of casting application range.Present patent application
The casting magnesium alloy of protection can reach ordinary magnesium alloy and protect in argon gas under the no pressure casting condition of argon gas protection
The effect of compression casting, density maintain 1.82-1.84g/cm3, and cast structure is finer and close.Rheology cast-internal hole compared with
It is few, and bore hole size also becomes comparatively fine, corresponding cast-internal hole area percentage is respectively 0.2-0.8%.The alloy
Cubical contraction is before and after solidification0.6%, thus can consider before casting afterwards without volume change.The alloy is due to solidifying
Gu when volume contraction does not occur, not only eliminate casting flaws and its roots such as shrinkage porosite and the shrinkage cavity in casting process, and
And traditional magnesium alloy system of risers that weight is 0.6-3 times of casting weight in casting process is also eliminated, material is greatly saved
Material, the energy and manpower, so that the production cost of casting significantly reduces.In addition, surface hardness of the magnesium alloy under as cast condition
125-130HB can be respectively reached, thus there are extremely excellent surface mechanical properties.
Specific embodiment
Embodiment 1
A kind of no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique.By weight percentage, the group of alloy becomes
Li:0.6wt.%,Sb:2.0wt.%,In:5.0wt.%,Bi:4.0wt.%,Pb:1.0wt.%,Ge:3.0wt.%,Si:1.2wt.%,
Sn:5.0wt.%, surplus are magnesium.A kind of above-mentioned no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique, including it is as follows
Step: the raw material as above matched is added in the electric induction furnace under ar gas environment, and uses graphite crucible;700 when melting
Degree heat preservation 10 minutes, it is uniform by Efco-Northrup furnace electromagnetic agitation;1 minute, which is kept the temperature, at 700 degree after mixing evenly and is cast comes out of the stove;It closes
Gold casting uses the punching block of diameter 20-30mm, and is cooled down by the way of water cooling.Resulting ingot casting is heated under protection of argon gas
To 650-700 degree and keep the temperature 10 minutes;Then the melt is poured into and carries out cast molding in the mold being ready for;Cooling and demolding
After carry out eliminate casting stress vacuum annealing, temperature be 140 degree, the time be 0.4 hour.
The alloy has wide solidification temperature range (180-420 degree).The wherein setting temperature of main rich magnesium melt
Range is 300-420 degree, and the solidification temperature range of rich bismuth is 180-200 degree.The solidification temperature range of two kinds of liquid phases cover from
420 degree of temperature ranges to 180 degree, thus when being cast with the alloy, the cast member consistency that can be obtained is high,
It can achieve 98% or more to occur without apparent hole.The alloy can reach under the no pressure casting condition that argon gas is protected
To ordinary magnesium alloy in the effect of argon gas protection compression casting, cast structure is finer and close, and rheology cast-internal hole is less, and
Bore hole size also becomes comparatively fine, and corresponding cast-internal hole area percentage is respectively 0.4%.The alloy is before solidification
Cubical contraction is afterwards0.6%, thus can consider before casting afterwards without volume change.In addition, the magnesium alloy is under as cast condition
Surface hardness can respectively reach 128HB, thus there are extremely excellent surface mechanical properties.
Embodiment 2
A kind of no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique.By weight percentage, the group of alloy becomes
Li:0.8wt.%,Sb:3.0wt.%,In:8.0wt.%,Bi:6.0wt.%,Pb:2.0wt.%,Ge:5.0wt.%,Si:1.5wt.%,
Sn:8.0wt.%, surplus are magnesium.A kind of above-mentioned no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique, including it is as follows
Step: the raw material as above matched is added in the electric induction furnace under ar gas environment, and uses graphite crucible;700 when melting
Degree heat preservation 10 minutes, it is uniform by Efco-Northrup furnace electromagnetic agitation;1 minute, which is kept the temperature, at 700 degree after mixing evenly and is cast comes out of the stove;It closes
Gold casting uses the punching block of diameter 20-30mm, and is cooled down by the way of water cooling.Resulting ingot casting is heated under protection of argon gas
To 650-700 degree and keep the temperature 10 minutes;Then the melt is poured into and carries out cast molding in the mold being ready for;Cooling and demolding
After carry out eliminate casting stress vacuum annealing, temperature be 140 degree, the time be 0.4 hour.
The alloy has wide solidification temperature range (180-420 degree).The wherein setting temperature of main rich magnesium melt
Range is 300-420 degree, and the solidification temperature range of rich bismuth is 180-200 degree.The solidification temperature range of two kinds of liquid phases cover from
420 degree of temperature ranges to 180 degree, thus when being cast with the alloy, the cast member consistency that can be obtained is high,
It can achieve 98% or more to occur without apparent hole.The alloy can reach under the no pressure casting condition that argon gas is protected
To ordinary magnesium alloy in the effect of argon gas protection compression casting, cast structure is finer and close, and rheology cast-internal hole is less, and
Bore hole size also becomes comparatively fine, and corresponding cast-internal hole area percentage is respectively 0.5%.The alloy is before solidification
Cubical contraction is afterwards0.6%, thus can consider before casting afterwards without volume change.In addition, the magnesium alloy is under as cast condition
Surface hardness can respectively reach 126HB, thus there are extremely excellent surface mechanical properties.
Embodiment 3
A kind of no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique.By weight percentage, the group of alloy becomes
Li:0.7wt.%,Sb:2.5wt.%,In:5.2wt.%,Bi:4.8wt.%,Pb:1.5wt.%,Ge:3.2wt.%,Si:1.3wt.%,
Sn:5.8wt.%, surplus are magnesium.A kind of above-mentioned no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique, including it is as follows
Step: the raw material as above matched is added in the electric induction furnace under ar gas environment, and uses graphite crucible;700 when melting
Degree heat preservation 10 minutes, it is uniform by Efco-Northrup furnace electromagnetic agitation;1 minute, which is kept the temperature, at 700 degree after mixing evenly and is cast comes out of the stove;It closes
Gold casting uses the punching block of diameter 20-30mm, and is cooled down by the way of water cooling.Resulting ingot casting is heated under protection of argon gas
To 650-700 degree and keep the temperature 10 minutes;Then the melt is poured into and carries out cast molding in the mold being ready for;Cooling and demolding
After carry out eliminate casting stress vacuum annealing, temperature be 140 degree, the time be 0.4 hour.
The alloy has wide solidification temperature range (180-420 degree).The wherein setting temperature of main rich magnesium melt
Range is 300-420 degree, and the solidification temperature range of rich bismuth is 180-200 degree.The solidification temperature range of two kinds of liquid phases cover from
420 degree of temperature ranges to 180 degree, thus when being cast with the alloy, the cast member consistency that can be obtained is high,
It can achieve 98% or more to occur without apparent hole.The alloy can reach under the no pressure casting condition that argon gas is protected
To ordinary magnesium alloy in the effect of argon gas protection compression casting, cast structure is finer and close, and rheology cast-internal hole is less, and
Bore hole size also becomes comparatively fine, and corresponding cast-internal hole area percentage is respectively 0.3%.The alloy is before solidification
Cubical contraction is afterwards0.6%, thus can consider before casting afterwards without volume change.In addition, the magnesium alloy is under as cast condition
Surface hardness can respectively reach 127HB, thus there are extremely excellent surface mechanical properties.
Claims (3)
1. a kind of no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique；According to weight percent, the alloy at
It is divided into: Li:0.6-0.8wt.%, Sb:2.0-3.0wt.%, In:5.0-8.0wt.%, Bi:4.0-6.0wt.%, Pb:1.0-
2.0wt.%,Ge:3.0-
5.0wt.%, Si:1.2-1.5wt.%, Sn:5.0-8.0wt.%, surplus are magnesium.
2. a kind of no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique, feature exist according to claim 1
In including following smelting step: the raw material as above matched being added in the electric induction furnace under ar gas environment, and uses graphite earthenware
Crucible;10 minutes are kept the temperature at 700 degree when melting, it is uniform by Efco-Northrup furnace electromagnetic agitation;1 point is kept the temperature at 700 degree after mixing evenly
Clock and cast come out of the stove;Alloy casting uses the punching block of diameter 20-30mm, and is cooled down by the way of water cooling.
3. a kind of no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique, feature exist according to claim 1
In comprising using step as follows: resulting ingot casting being heated to 650-700 degree under protection of argon gas and keeps the temperature 10 minutes;Then will
The melt, which pours into, carries out cast molding in the mold being ready for;Elimination casting stress vacuum is carried out after cooling and demolding to move back
Fire, temperature are 140 degree, and the time is 0.4 hour.
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| CN201811093195.3A CN109082570A (en) | 2018-09-19 | 2018-09-19 | A kind of no solidification shrinkage characteristic high-rigidity cast magnesium alloy and its technique |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104894446A (en) * | 2015-03-15 | 2015-09-09 | 湖南工程学院 | Heatproof rare earth magnesium alloy used for casting of metal mold and preparation method thereof |
| CN104988371A (en) * | 2015-06-16 | 2015-10-21 | 上海交通大学 | Rear-earth magnesium alloy suitable for sand mould casting and preparation method for rear-earth magnesium alloy |
| CN107034403A (en) * | 2017-03-23 | 2017-08-11 | 中南大学 | The big ingot blank semicontinuous casting technique of VW64M high-strength heat-resistant magnesium alloys |
| WO2018154124A1 (en) * | 2017-02-24 | 2018-08-30 | Innomaq 21, S.L. | Method for the economic manufacture of light components |
-
2018
- 2018-09-19 CN CN201811093195.3A patent/CN109082570A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104894446A (en) * | 2015-03-15 | 2015-09-09 | 湖南工程学院 | Heatproof rare earth magnesium alloy used for casting of metal mold and preparation method thereof |
| CN104988371A (en) * | 2015-06-16 | 2015-10-21 | 上海交通大学 | Rear-earth magnesium alloy suitable for sand mould casting and preparation method for rear-earth magnesium alloy |
| WO2018154124A1 (en) * | 2017-02-24 | 2018-08-30 | Innomaq 21, S.L. | Method for the economic manufacture of light components |
| CN107034403A (en) * | 2017-03-23 | 2017-08-11 | 中南大学 | The big ingot blank semicontinuous casting technique of VW64M high-strength heat-resistant magnesium alloys |
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