CN108165842B - A kind of semisolid pressure casting high thermal conductivity aluminium alloy and its pressure casting method - Google Patents
A kind of semisolid pressure casting high thermal conductivity aluminium alloy and its pressure casting method Download PDFInfo
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- CN108165842B CN108165842B CN201810095462.4A CN201810095462A CN108165842B CN 108165842 B CN108165842 B CN 108165842B CN 201810095462 A CN201810095462 A CN 201810095462A CN 108165842 B CN108165842 B CN 108165842B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/007—Semi-solid pressure die casting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- 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
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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Abstract
A kind of semisolid pressure casting high thermal conductivity aluminium alloy and its pressure casting method, the ingredient and mass percent of the aluminium alloy are as follows: Si 6.6~7.4%, Mg 0.15~0.25%, Ti 0.03~0.05%, Cr 0.05~0.1%, Yb 0.01~0.02%, Te 0.01~0.03%, Be 0.05~0.1%, Fe≤0.15%, surplus are Al and inevitable other impurity elements.Pressure casting method includes ingredient, smelting aluminium alloy liquid, prepares semi solid slurry, semisolid pressure casting and solid-solution and aging heat treatment.The present invention passes through the content of optimization Si, Mg main alloying element, refinement α-Al crystal grain, rotten richness Fe phase and common reciever, enable aluminum alloy to that there is high thermal conductivity, high intensity and excellent Semi-solid Thixo-Casting performance, it is suitable for the various components more demanding to heat dissipation performance of semisolid pressure casting, such as wireless communication base station shell, heat-radiating substrate, electronic equipment casing, electrical heating disc.
Description
Technical field
The invention belongs to aluminium alloy compression casting technical field, be specifically related to a kind of semisolid pressure casting high thermal conductivity aluminium alloy and its
Pressure casting method.
Background technique
Aluminium alloy has the characteristics such as good, the corrosion-resistant and distinctive metallic luster of light weight, obdurability, is widely used in electricity
The fields such as sub- electric appliance, Communication Equipment, illuminating device, electric tool, new-energy automobile, such as smart phone, laptop, plate
The shell of the electronic products such as computer, the heat sinking back-plate and lampshade of LED light, heat-radiating substrate, filter and the machine of wireless communication base station
Cabinet shell, electric cooker, electromagnetic oven, water heater heat-generating disc, the power battery case of new-energy automobile control power case, drives
Dynamic motor housing etc..With the continuous increase of various heating device power, in order to meet the cooling requirements of heating device, aluminium is closed
The heating conduction of gold also requires higher and higher.
Semisolid pressure casting is to be suspended in the semi solid slurry progress casting forming that liquid phase forms to by spherical solid-phase grain
Technology, since semi solid slurry is different from the solid-liquid mixed slurry that traditional dendritic solidification is formed, semisolid pressure casting technology tool
Have the following advantages: (1) since semi solid slurry has good mobility, semisolid pressure casting can shape various shape complexity
Components；(2) since the viscosity of semi solid slurry is higher than liquid metal, semisolid pressure casting can be to avoid the splashing of metal when filling type
And it is involved in gas, semisolid pressure casting part can do heat treatment and further increase its mechanical property；(3) due to the temperature of semi solid slurry
Degree is lower than liquid metal, and the mold filling temperature of semisolid pressure casting is low, can mitigate the thermal shock to compression mod, improves making for compression mod
Use the service life；(4) since semi solid slurry has had the solid-phase grain of part, the solidification shrinkage rate of semisolid pressure casting is small, can be with
The defects of avoiding shrinkage cavity, loose, sticking to mould, obtains that wall thickness is thinner, organizes finer and close, the higher each type component of mechanical property.
Unique technology advantage possessed by semisolid pressure casting is very suitable for producing electronic apparatus, Communication Equipment, luminaire
The various aluminium alloys heat dissipation components in the fields such as part, electric tool, new-energy automobile.But existing semisolid pressure casting is with aluminium alloy master
If the Al-Si system cast aluminium alloy gold of the trades mark such as A356, ADC12, the cast aluminium alloy golds of these trades mark due to Si constituent content compared with
Height, therefore there is good casting fluidity and machining property, but heating conduction is generally poor, such as A356 cast aluminium alloy gold
Thermal coefficient highest there was only 120W/ (mK), and the thermal coefficient highest of ADC12 cast aluminium alloy gold only has 100W/ (mK),
The cast aluminium alloy gold of these trades mark is caused to be difficult to meet the rapid cooling functional requirement of various heating devices.
In the common Al-Mg-Si-type aluminum alloy of wrought aluminium alloy manufacture field, the typical trade mark has 6061,6063 etc..These
Trade mark wrought aluminium alloy is usually less than 1.2% since Si content is usually less than 0.8%, Mg content, thus has good thermal conductivity
Can, thermal coefficient is usually above 180W/ (mK), wherein the thermal coefficient of 6061 aluminium alloys is up to 185W/ (mK), and
The thermal coefficient of 6063 aluminium alloys is up to 190W/ (mK).Although the wrought aluminium alloy of these trades mark has good thermal conductivity
Can, but since Si content is lower, causes the casting fluidity of the wrought aluminium alloy of these trades mark very poor, be unable to satisfy semisolid
The technique requirement of die casting, is suitable only for the plastic processing methods such as squeezing, roll, forge.
Summary of the invention
It is an object of the invention to there are problem and shortage, provide one kind for above-mentioned, to can satisfy semisolid pressure casting various
The semisolid pressure casting high thermal conductivity aluminium alloy and its pressure casting method that the production of radiator aluminum alloyed components needs.
The technical scheme of the present invention is realized as follows:
Semisolid pressure casting high thermal conductivity aluminium alloy of the present invention, its main feature is that: the aluminium alloy uses semisolid pressure casting technology
It is made, and by following mass percent at being grouped as: Si 6.6~7.4%, Mg 0.15~0.25%, Ti 0.03~0.05%,
Cr 0.05~0.1%, Yb 0.01~0.02%, Te 0.01~0.03%, Be 0.05~0.1%, Fe≤0.15%, surplus Al
With inevitable other impurity elements, wherein the mass ratio of Cr and Yb is 5:1, and other single contents of impurity element are less than
0.05%, total amount is less than 0.15%.
The pressure casting method of semisolid pressure casting high thermal conductivity aluminium alloy of the present invention, its main feature is that the following steps are included:
Step 1: selecting Al10Ti alloy, Al5Cr1Yb alloy, Al5Te to close according to the ingredient percent of aluminium alloy
Aluminium ingot, 99.9% instant silicon and 99.95% magnesium ingot that gold, Al5Be alloy and purity are 99.7% are matched as raw material
Material；
Step 2: melting aluminium ingot in 700~750 DEG C of heating, then it is added and accounts for raw material total weight is 6.6~7.4%
Instant silicon, 0.15~0.25% magnesium ingot, 0.3~0.5% Al10Ti alloy, 1~2% Al5Cr1Yb alloy, 0.2~0.6%
Al5Te alloy and 1~2% Al5Be alloy, stirring be fused into aluminum alloy melt；
Step 3: after carrying out refining degasification slagging-off to aluminum alloy melt, using ultrasonic activation method, in ultrasonic frequency vibratory
Under the conditions of being 20~30 seconds for 40~50 hertz, ultrasonic activation time, it is 620~640 DEG C that aluminum alloy melt, which is prepared into temperature,
Aluminium alloy semi-solid slurry；
Step 4: mold cavity temperature is 100~150 DEG C, injection speed is 0.5~1 meter per second, injection ratio pressure 60
Under the conditions of~80MPa, boost pressure are 90~120MPa and the dwell time is 4~6 seconds, by aluminium alloy semi-solid slurry semisolid
It is cast into aluminium alloy；
Step 5: by semisolid pressure casting at aluminium alloy 520~530 DEG C solution treatment 12~14 hours, after water quenching,
175~185 DEG C ageing treatment 6~8 hours, semisolid pressure casting high thermal conductivity aluminium alloy, the semisolid pressure casting are obtained after furnace cooling
The thermal coefficient of high thermal conductivity aluminium alloy is greater than 160W/ (mK), and tensile strength is greater than 260MPa, and elongation is greater than 8%.
Compared with prior art, the present invention having the advantage that
(1) present invention improves the heating conduction of semisolid pressure casting aluminium alloy by reducing the content of Si, Mg, then passes through refinement
Nodularization α-Al crystal grain, fine degenerate Fe-riched phase and common reciever, further increase mobility, the intensity of semisolid pressure casting aluminium alloy
And plasticity, make semisolid pressure casting aluminium alloy that there is high thermal conductivity, high intensity and excellent semisolid pressure casting performance；
(2) present invention obtains crystal grain by the preparation process and semisolid pressure casting technique of optimization aluminium alloy semi-solid slurry
Average diameter is greater than 0.8 aluminium alloy semi-solid slurry less than 50 microns, crystal grain average spherical degree, further increases aluminium alloy
Semisolid pressure casting performance meets the semisolid pressure casting requirement of various shape complexity radiator components；
(3) thermal coefficient of semisolid pressure casting high thermal conductivity aluminium alloy of the present invention is greater than 160W/ (mK), and tensile strength is greater than
260MPa, elongation are greater than 8%, have the advantages that good heat conductivity, intensity are high and plasticity is good, it is various to be suitable for semisolid pressure casting
The aluminum alloy spare part more demanding to heat dissipation performance, as electronic product casing, wireless communication base station shell, electrical heating disc,
The power battery case etc. of new-energy automobile.
Specific embodiment
Below to semisolid pressure casting high thermal conductivity aluminium alloy of the present invention at being grouped as meaning and content range limits reason
By being illustrated.
Semisolid pressure casting high thermal conductivity aluminium alloy of the present invention, by following mass percent at being grouped as: Si 6.6
~7.4%, Mg 0.15~0.25%, Ti 0.03~0.05%, Cr 0.05~0.1%, Yb 0.01~0.02%, Te 0.01~
0.03%, Be 0.05~0.1%, Fe≤0.15%, surplus are Al and inevitable other impurity elements, wherein Cr's and Yb
Mass ratio is 5:1, and other single contents of impurity element are less than 0.05%, and total amount is less than 0.15%.
Si can form Al+Si eutectic liquid phase with Al in aluminium alloy, improve the die casting mobility of aluminium alloy, while can also mention
The intensity and machining property of high-aluminium alloy.Si content is higher, and eutectic liquid phase is more, and the die casting mobility of aluminium alloy is better,
But the heating conduction and plasticity of aluminium alloy can be gradually reduced.When Si content is lower than 6.6%, the mobility of aluminium alloy can not meet half
The technique requirement of solid die casting, and when Si content is more than 7.4%, the heating conduction of aluminium alloy, which will appear, to be remarkably decreased, thermal coefficient
Required 160 W/ (mK) are not achieved.Therefore, in order to guarantee aluminium alloy have enough die casting mobility and heating conduction, Si
Content is selected 6.6~7.4%.
Mg can form Mg with Si in semisolid pressure casting aluminium alloy2Si hardening constituent enhances the strong of semisolid pressure casting aluminium alloy
Degree, Mg content is higher, and the intensity of semisolid pressure casting aluminium alloy is also higher, but heating conduction can be gradually reduced.Mg content is lower than
0.15%, 260MPa is not achieved in the intensity of semisolid pressure casting aluminium alloy, and Mg content is more than 0.25%, will lead to the thermal conductivity of aluminium alloy
It can be remarkably decreased, required 160 W/ (mK) are not achieved in thermal coefficient.Therefore, in order to guarantee semisolid pressure casting aluminium alloy
Intensity and heating conduction, Mg content select 0.15~0.25%.
Ti primarily serves the effect of refinement α-Al crystal grain in semisolid pressure casting aluminium alloy, improves the structural constituent of aluminium alloy
Uniformity improves mobility, intensity and the plasticity of semisolid pressure casting aluminium alloy.Ti content is less than 0.03%, and grain refining effect is not
Obviously.Ti content is higher, and grain refining effect is better, but when Ti content is more than 0.05%, also results in the heating conduction of aluminium alloy
It is remarkably decreased.Therefore, the selection of Ti content is 0.03~0.05%.
Cr, Yb are added in semisolid pressure casting aluminium alloy with Al5Cr1Yb alloy form, and main function is fine degenerate
Rich Fe phase.Fe is inevitable impurity element in aluminium alloy, usually with coarse needle-shaped richness Fe phase formal distribution in aluminium alloy
In alloy matrix aluminum, it is to cause conventional cast intensity of aluminum alloy inclined that coarse needle-shaped richness Fe, which meets, which seriously isolates alloy matrix aluminum,
The main reason for low, particularly plasticity is lower.Inventor has found after passing through lot of experiments, individually adds Cr element or Yb member
Element has inhibiting effect to the growth of coarse needle-shaped richness Fe phase, but all cannot be completely eliminated coarse needle-shaped richness Fe phase.The study found that
When 0.05~0.1% Cr element of compound addition and 0.01~0.02% Yb element, and when the mass ratio of Cr and Yb is 5:1, lead to
The reciprocation for crossing Cr and Yb carries out fine degenerate to rich Fe phase, can completely inhibit rich Fe phase and grow by needle-shaped direction, make richness
Fe phase eliminates influence of the richness Fe with respect to intensity of aluminum alloy and plasticity, significantly from the coarse needle-shaped graininess for being changed into fine uniform
Improve the intensity and plasticity of semisolid pressure casting aluminium alloy.Cr constituent content is less than 0.05% or Yb constituent content is less than 0.01%,
Or the mass ratio of Cr and Yb all cannot be completely eliminated coarse needle-shaped richness Fe phase when not being 5:1.Therefore, Al5Cr1Yb alloy adds
Dosage selection 1~2%, aluminium alloy contains 0.05~0.1% Cr and 0.01~0.02% Yb.
Te main function in semisolid pressure casting aluminium alloy is fine degenerate common reciever, improves semisolid pressure casting aluminium alloy
Mobility, intensity and plasticity.Common reciever is usually to be distributed in alloy matrix aluminum in aluminium alloy with coarse sheet, this
Coarse lamellar eutectic Si meets and seriously isolates alloy matrix aluminum, is to cause traditional Al-Si system cast aluminium alloy gold intensity low, especially
The low major reason of plasticity.The prior art is usually to add Na or Sr member usually fine degenerate common reciever, but the refinement of Na becomes
Matter effect is unstable, is also easy to cause " sodium is crisp " problem, though Sr has the advantages that fine degenerate effect is good, it is molten to will lead to aluminium alloy
Body air-breathing.Inventor has found that Te element is semisolid pressure casting aluminium alloy common reciever of the present invention after passing through lot of experiments
Effective fine degenerate element, can, " sodium crisp ", air-breathing poor to avoid stability existing for traditional Na, Sr element the problems such as.Addition
0.01~0.03% Te element can be such that the form of eutectic Si in semisolid pressure casting aluminium alloy is changed into from coarse sheet tiny
Even graininess or threadiness significantly improves the mobility, intensity and plasticity of semisolid pressure casting aluminium alloy.
Be main function in semisolid pressure casting aluminium alloy is the nodularization for promoting α-Al crystal grain.The sphericity of α-Al crystal grain is got over
The mobility of height, aluminium alloy semi-solid slurry is then better, is better suited for Semi-solid Thixo-Casting.Traditional aluminium alloy semi-solid slurry
Preparation method for material, it is mainly brilliant to obtain the higher α-Al of sphericity by increasing speed of agitator or extending the methods of mixing time
Grain.Inventor has found that Be element is a kind of surface active element after passing through lot of experiments, the Be member of addition 0.05~0.1%
Element can significantly promote the nodularization process of semisolid pressure casting aluminium alloy α-Al crystal grain of the present invention, under identical preparation process condition,
Semisolid pressure casting aluminium alloy can be made to obtain the higher α-Al crystal grain of sphericity, significantly improve the flowing of semisolid pressure casting aluminium alloy
Property.
Below to the pressure casting method and technological parameter restriction reason of semisolid pressure casting high thermal conductivity aluminium alloy of the present invention
It is illustrated.
The pressure casting method of semisolid pressure casting high thermal conductivity aluminium alloy of the present invention, its main feature is that the following steps are included:
Step 1: selecting the instant of the aluminium ingot, 99.9% that purity is 99.7% according to the ingredient percent of aluminium alloy
Silicon, 99.95% magnesium ingot, Al10Ti alloy, Al5Cr1Yb alloy, Al5Te alloy and Al5Be alloy are that raw material carry out ingredient；
Step 2: melt aluminium ingots in 700~750 DEG C of heating, the instant of account for that raw material total weight is 6.6~7.4% is added
Silicon, 0.15~0.25% magnesium ingot, 0.3~0.5% Al10Ti alloy, 1~2% Al5Cr1Yb alloy, 0.2~0.6%
Al5Te alloy and 1~2% Al5Be alloy, stirring be fused into aluminum alloy melt；
The degree of purity of aluminium alloy is higher, and heating conduction is also better.Fe,Cu,Zn,Ni,Li,Mn,Zr,Sr,Sc,Er,Sn,Pb
Equal elements are aluminium ingot, instant silicon, impurity element common in magnesium ingot, these impurity elements can not only deteriorate aluminium conjunction in aluminium alloy
The mechanical property of gold, it is often more important that the heating conduction of aluminium alloy can be reduced.Therefore, these impurity elements must be controlled strictly
System.The present invention by selecting aluminium ingot, 99.9% instant silicon, 99.95% magnesium ingot that purity is 99.7% as main raw material(s),
The content of Impurity Fe can be controlled 0.15% hereinafter, the impurity member such as Cu, Zn, Ni, Li, Mn, Zr, Sr, Sc, Er, Sn, Pb
The single content of element is less than 0.05%, total amount less than 0.15%, it is ensured that semisolid pressure casting aluminium alloy obtains high thermal conductivity and excellent
Mechanical property；
Step 3: after carrying out refining degasification slagging-off to aluminum alloy melt, using ultrasonic activation method, in ultrasonic frequency vibratory
Under the conditions of being 20~30 seconds for 40~50 hertz, ultrasonic activation time, it is 620~640 DEG C that aluminum alloy melt, which is prepared into temperature,
Aluminium alloy semi-solid slurry；
The size of α-Al crystal grain is smaller in aluminium alloy semi-solid slurry, sphericity is higher, the stream of aluminium alloy semi-solid slurry
Dynamic property is better, is more conducive to Semi-solid Thixo-Casting.Therefore, the α-Al crystal grain aluminium alloy half that size is tiny, sphericity is high is obtained
Solid size is the essential condition for realizing semisolid pressure casting.Inventor is had found by lot of experiments, in ultrasonic activation frequency
Under the conditions of rate is 40~50 hertz, time of vibration is 20~30 seconds, semisolid pressure casting aluminium alloy of the present invention can obtain averagely straight
Diameter is greater than 0.8 α-Al crystal grain aluminium alloy semi-solid slurry, this aluminium alloy semi-solid slurry less than 50 microns, average spherical degree
With excellent mobility, it is very suitable for Semi-solid Thixo-Casting；
Step 4: mold cavity temperature is 100~150 DEG C, injection speed is 0.5~1 meter per second, injection ratio pressure 60
Under the conditions of~80MPa, boost pressure are 90~120MPa and the dwell time is 4~6 seconds, by aluminium alloy semi-solid slurry semisolid
It is cast into aluminium alloy；
Semi solid slurry is made of spherical α-Al crystal grain with eutectic liquid phase, and this tissue is different from traditional dendritic solidification shape
At solid-liquid mixed slurry, determining the technological parameter of the technological parameter of semisolid pressure casting and conventional liquid die casting, there is also biggish
It is different.Inventor has found after carrying out system research to the die-casting process of semisolid pressure casting aluminium alloy of the present invention, in mold cavity temperature
Degree is 100~150 DEG C, injection speed is 0.5~1 meter per second, injection ratio pressure is 60~80MPa, boost pressure is 90~120MPa
It, can be to avoid filling type mistake by aluminium alloy semi-solid slurry semisolid pressure casting at aluminium alloy under the conditions of being 4~6 seconds with the dwell time
Journey, which generates, splashes and is involved in gas and field trash, meets the die casting requirement of various shape complexity, dense structure's radiator components；
Step 5: by semisolid pressure casting aluminium alloy 520~530 DEG C solution treatment 12~14 hours, after water quenching, 175
~185 DEG C ageing treatment 6~8 hours, semisolid pressure casting high thermal conductivity aluminium alloy is obtained after furnace cooling.
The microscopic structure of semisolid pressure casting aluminium alloy is made of spherical particle and eutectic phase, this and traditional pack alloy
Dendritic solidification tissue it is different, determine the heat treatment process of semisolid pressure casting aluminium alloy and the heat treatment work of traditional pack alloy
There is also biggish differences for skill.After inventor carries out system research to the solid solution aging technique of semisolid pressure casting aluminium alloy of the present invention
It was found that 520~530 DEG C solution treatment 12~14 hours, after water quenching, 175~185 DEG C ageing treatment 6~8 hours, with furnace
After cooling, desired heating conduction and mechanical property is can be obtained in semisolid pressure casting aluminium alloy, i.e. thermal coefficient is greater than 160 W/
(mK), tensile strength is greater than 260MPa, and elongation is greater than 8%.If solid solution aging technique is not in above-mentioned matching range, half
Desired heating conduction and mechanical property is not achieved in solid die casting aluminium alloy.
In conjunction with specific embodiment and comparative example, further description of the technical solution of the present invention below, so as to more
Good understanding technical solution of the present invention.
Embodiment 1:
Semisolid pressure casting high thermal conductivity aluminium alloy is by following mass percent at being grouped as: Si 6.6%, Mg 0.15%, Ti
0.03%, Cr 0.05%, Yb 0.01%, Te 0.01%, Be 0.05%, Fe≤0.15%, surplus be Al and inevitably it is other
Impurity element, other single contents of impurity element are less than 0.05%, and total amount is less than 0.15%.The semisolid pressure casting high thermal conductivity aluminium alloy
Pressure casting method the following steps are included:
Step 1: selecting Al10Ti alloy, Al5Cr1Yb alloy, Al5Te to close according to the ingredient percent of aluminium alloy
Aluminium ingot, 99.9% instant silicon and 99.95% magnesium ingot that gold, Al5Be alloy and purity are 99.7% are matched as raw material
Material；
Step 2: melt aluminium ingots in 750 DEG C of heating, be then added the 6.6% instant silicon for accounting for raw material total weight and being,
0.15% magnesium ingot, 0.3% Al10Ti alloy, 1% Al5Cr1Yb alloy, 0.2% Al5Te alloy and 1% Al5Be alloy,
Stirring is fused into aluminum alloy melt；
Step 3: refining degasification slagging-off is carried out to aluminum alloy melt with the carbon trichloride for accounting for raw material total weight 0.5%, super
Under the conditions of acoustic vibration frequency is 40 hertz, the ultrasonic activation time is 30 seconds, it is 640 DEG C that aluminum alloy melt, which is prepared into temperature,
Aluminium alloy semi-solid slurry；
Step 4: mold cavity temperature is 100 DEG C, injection speed is 1 meter per second, injection ratio pressure 80MPa, pressurization pressure
Under the conditions of power is 120MPa and the dwell time is 6 seconds, by aluminium alloy semi-solid slurry semisolid pressure casting at aluminium alloy；
Step 5: by semisolid pressure casting at aluminium alloy 530 DEG C solution treatment 12 hours, after water quenching, in 175 DEG C of timeliness
Processing 8 hours, obtains semisolid pressure casting high thermal conductivity aluminium alloy after furnace cooling.
Embodiment 2:
Semisolid pressure casting high thermal conductivity aluminium alloy is by following mass percent at being grouped as: Si 7%, Mg 0.25%, Ti
0.04%, Cr 0.1%, Yb 0.02%, Te 0.02%, Be 0.09%, Fe≤0.15%, surplus be Al and inevitably it is other
Impurity element, other single contents of impurity element are less than 0.05%, and total amount is less than 0.15%.The semisolid pressure casting high thermal conductivity aluminium alloy
Pressure casting method the following steps are included:
Step 1: selecting Al10Ti alloy, Al5Cr1Yb alloy, Al5Te to close according to the ingredient percent of aluminium alloy
Aluminium ingot, 99.9% instant silicon and 99.95% magnesium ingot that gold, Al5Be alloy and purity are 99.7% are matched as raw material
Material；
Step 2: melting aluminium ingot in 725 DEG C of heating, the 7% instant silicon for accounting for raw material total weight and being, 0.25% is then added
Magnesium ingot, 0.4% Al10Ti alloy, 2% Al5Cr1Yb alloy, 0.4% Al5Te alloy and 1.8% Al5Be alloy, stir
It mixes and is fused into aluminum alloy melt；
Step 3: refining degasification slagging-off is carried out to aluminum alloy melt with the carbon trichloride for accounting for raw material total weight 0.5%, super
Under the conditions of acoustic vibration frequency is 45 hertz, the ultrasonic activation time is 25 seconds, it is 630 DEG C that aluminum alloy melt, which is prepared into temperature,
Aluminium alloy semi-solid slurry；
Step 4: mold cavity temperature is 125 DEG C, injection speed is 0.7 meter per second, injection ratio pressure 70MPa, pressurization
Under the conditions of pressure is 100MPa and the dwell time is 5 seconds, by aluminium alloy semi-solid slurry semisolid pressure casting at aluminium alloy；
Step 5: by semisolid pressure casting at aluminium alloy 525 DEG C solution treatment 13 hours, after water quenching, in 185 DEG C of timeliness
Processing 6 hours, obtains semisolid pressure casting high thermal conductivity aluminium alloy after furnace cooling.
Embodiment 3:
Semisolid pressure casting high thermal conductivity aluminium alloy is by following mass percent at being grouped as: Si 7.4%, Mg 0.2%, Ti
0.05%, Cr 0.075%, Yb 0.015%, Te 0.03%, Be 0.1%, Fe≤0.15%, surplus be Al and inevitably its
Its impurity element, other single contents of impurity element are less than 0.05%, and total amount is less than 0.15%.The semisolid pressure casting high thermal conductivity aluminium closes
Gold pressure casting method the following steps are included:
Step 1: selecting Al10Ti alloy, Al5Cr1Yb alloy, Al5Te to close according to the ingredient percent of aluminium alloy
Aluminium ingot, 99.9% instant silicon and 99.95% magnesium ingot that gold, Al5Be alloy and purity are 99.7% are matched as raw material
Material；
Step 2: melt aluminium ingots in 700 DEG C of heating, be then added the 7.4% instant silicon for accounting for raw material total weight and being,
0.2% magnesium ingot, 0.5% Al10Ti alloy, 1.5% Al5Cr1Yb alloy, 0.6% Al5Te alloy and 2% Al5Be are closed
Gold, stirring are fused into aluminum alloy melt；
Step 3: refining degasification slagging-off is carried out to aluminum alloy melt with the carbon trichloride for accounting for raw material total weight 0.5%, super
Under the conditions of acoustic vibration frequency is 50 hertz, the ultrasonic activation time is 20 seconds, it is 620 DEG C that aluminum alloy melt, which is prepared into temperature,
Aluminium alloy semi-solid slurry；
Step 4: mold cavity temperature is 150 DEG C, injection speed is 0.5 meter per second, injection ratio pressure 60MPa, pressurization
Under the conditions of pressure is 90MPa and the dwell time is 6 seconds, by aluminium alloy semi-solid slurry semisolid pressure casting at aluminium alloy；
Step 5: by semisolid pressure casting at aluminium alloy 520 DEG C solution treatment 14 hours, after water quenching, in 180 DEG C of timeliness
Processing 7 hours, obtains semisolid pressure casting high thermal conductivity aluminium alloy after furnace cooling.
Comparative example 1:
Semisolid pressure casting high thermal conductivity aluminium alloy is by following mass percent at being grouped as: Si 7%, Mg 0.25%, Ti
0.04%, Te 0.02%, Be 0.09%, Fe≤0.15%, surplus are Al and inevitable other impurity elements, other impurity
The single content of element is less than 0.05%, and total amount is less than 0.15%.The pressure casting method of the semisolid pressure casting high thermal conductivity aluminium alloy include with
Lower step:
Step 1: selecting Al10Ti alloy, Al5Te alloy, Al5Be alloy according to the ingredient percent of aluminium alloy
And aluminium ingot, 99.9% instant silicon and 99.95% magnesium ingot that purity is 99.7% carry out ingredient as raw material；
Step 2: melting aluminium ingot in 725 DEG C of heating, the 7% instant silicon for accounting for raw material total weight and being, 0.25% is then added
Magnesium ingot, 0.4% Al10Ti alloy, 0.4% Al5Te alloy and 1.8% Al5Be alloy, stirring be fused into aluminum alloy melt；
Step 3: refining degasification slagging-off is carried out to aluminum alloy melt with the carbon trichloride for accounting for raw material total weight 0.5%, super
Under the conditions of acoustic vibration frequency is 45 hertz, the ultrasonic activation time is 25 seconds, it is 630 DEG C that aluminum alloy melt, which is prepared into temperature,
Aluminium alloy semi-solid slurry；
Step 4: mold cavity temperature is 125 DEG C, injection speed is 0.7 meter per second, injection ratio pressure 70MPa, pressurization
Under the conditions of pressure is 100MPa and the dwell time is 5 seconds, by aluminium alloy semi-solid slurry semisolid pressure casting at aluminium alloy；
Step 5: by semisolid pressure casting at aluminium alloy 525 DEG C solution treatment 13 hours, after water quenching, in 185 DEG C of timeliness
Processing 6 hours, obtains semisolid pressure casting high thermal conductivity aluminium alloy after furnace cooling.
Comparative example 2:
Semisolid pressure casting high thermal conductivity aluminium alloy is by following mass percent at being grouped as: Si 7%, Mg 0.25%, Ti
0.04%, Cr 0.1%, Yb 0.02%, Be 0.09%, Fe≤0.15%, surplus other impurity elements for Al and inevitably,
Other single contents of impurity element are less than 0.05%, and total amount is less than 0.15%.The die casting side of the semisolid pressure casting high thermal conductivity aluminium alloy
Method the following steps are included:
Step 1: selecting Al10Ti alloy, Al5Cr1Yb alloy, Al5Be to close according to the ingredient percent of aluminium alloy
Aluminium ingot, 99.9% instant silicon and 99.95% magnesium ingot that gold and purity are 99.7% carry out ingredient as raw material；
Step 2: melting aluminium ingot in 725 DEG C of heating, the 7% instant silicon for accounting for raw material total weight and being, 0.25% is then added
Magnesium ingot, 0.4% Al10Ti alloy, 2% Al5Cr1Yb alloy and 1.8% Al5Be alloy, stirring be fused into aluminum alloy melt；
Step 3: refining degasification slagging-off is carried out to aluminum alloy melt with the carbon trichloride for accounting for raw material total weight 0.5%, super
Under the conditions of acoustic vibration frequency is 45 hertz, the ultrasonic activation time is 25 seconds, it is 630 DEG C that aluminum alloy melt, which is prepared into temperature,
Aluminium alloy semi-solid slurry；
Step 4: mold cavity temperature is 125 DEG C, injection speed is 0.7 meter per second, injection ratio pressure 70MPa, pressurization
Under the conditions of pressure is 100MPa and the dwell time is 5 seconds, by aluminium alloy semi-solid slurry semisolid pressure casting at aluminium alloy；
Step 5: by semisolid pressure casting at aluminium alloy 525 DEG C solution treatment 13 hours, after water quenching, in 185 DEG C of timeliness
Processing 6 hours, obtains semisolid pressure casting high thermal conductivity aluminium alloy after furnace cooling.
Comparative example 3:
Semisolid pressure casting high thermal conductivity aluminium alloy is by following mass percent at being grouped as: Si 7%, Mg 0.25%, Ti
0.04%, Cr 0.1%, Yb 0.02%, Te 0.02%, Fe≤0.15%, surplus other impurity elements for Al and inevitably,
Other single contents of impurity element are less than 0.05%, and total amount is less than 0.15%.The die casting side of the semisolid pressure casting high thermal conductivity aluminium alloy
Method the following steps are included:
Step 1: selecting Al10Ti alloy, Al5Cr1Yb alloy, Al5Te to close according to the ingredient percent of aluminium alloy
Aluminium ingot, 99.9% instant silicon and 99.95% magnesium ingot that gold and purity are 99.7% carry out ingredient as raw material；
Step 2: melting aluminium ingot in 725 DEG C of heating, the 7% instant silicon for accounting for raw material total weight and being, 0.25% is then added
Magnesium ingot, 0.4% Al10Ti alloy, 2% Al5Cr1Yb alloy and 0.4% Al5Te alloy, stirring be fused into aluminum alloy melt；
Step 3: refining degasification slagging-off is carried out to aluminum alloy melt with the carbon trichloride for accounting for raw material total weight 0.5%, super
Under the conditions of acoustic vibration frequency is 45 hertz, the ultrasonic activation time is 25 seconds, it is 630 DEG C that aluminum alloy melt, which is prepared into temperature,
Aluminium alloy semi-solid slurry；
Step 4: mold cavity temperature is 125 DEG C, injection speed is 0.7 meter per second, injection ratio pressure 70MPa, pressurization
Under the conditions of pressure is 100MPa and the dwell time is 5 seconds, by aluminium alloy semi-solid slurry semisolid pressure casting at aluminium alloy；
Step 5: by semisolid pressure casting at aluminium alloy 525 DEG C solution treatment 13 hours, after water quenching, in 185 DEG C of timeliness
Processing 6 hours, obtains semisolid pressure casting high thermal conductivity aluminium alloy after furnace cooling.
By National Standard of the People's Republic of China GMN/T16865-2013, by the semisolid pressure casting of embodiment and comparative example
Aluminium alloy is processed into standard tensile specimen, and room temperature tensile is carried out on DNS500 type electronic tensile test machine, and rate of extension is 2 millis
M/min, tensile mechanical properties are as shown in table 1.It is sampled on the semisolid pressure casting aluminium alloy of embodiment and comparative example,
The thermal coefficient of aluminium alloy is measured on QETRUD type conductometer, testing result is as shown in table 1.Half in embodiment and comparative example is solid
It is sampled on state pack alloy, it is straight using equalarea-circle under OLYMPUS metallographic microscope after sample is ground, polished and corroded
The average diameter of shot analysis measurement α-Al crystal grain, the average spherical degree of measurement α-Al crystal grain, inspection are analyzed using equivalent circularity method
The results are shown in Table 1 for survey.
From table 1, it can be seen that, the thermal coefficient of 1-3 semisolid pressure casting aluminium alloy of the embodiment of the present invention is greater than 160 W/ (m
K), tensile strength is greater than 260MPa, elongation be greater than the average diameter of 8%, α-Al crystal grain less than 50 microns, α-Al crystal grain it is flat
Equal sphericity is greater than 0.8.The semisolid die casting high thermal conductivity aluminium alloy of comparative example 1, due to not having to add Al5Cr1Yb alloy to richness
Fe phase carries out fine degenerate processing, and the tensile strength of semisolid die casting high thermal conductivity aluminium alloy is 223.7MPa, elongation 4.5%.
The semisolid die casting high thermal conductivity aluminium alloy of comparative example 2, due to there is no addition Te element to carry out fine degenerate processing to common reciever,
The tensile strength of semisolid die casting high thermal conductivity aluminium alloy is 235.6MPa, elongation 3.9%.The semisolid die casting of comparative example 3 is high
Thermally conductive aluminium alloy, due to not having to add Be element, the average grain diameter of semisolid die casting high thermal conductivity aluminium alloy is 45 microns, brilliant
Grain average spherical degree is 0.67.By comparing can see, the present invention passes through compound addition Cr, Yb element fine degenerate richness Fe
Phase, Te element fine degenerate common reciever and Be element promote the nodularization of α-Al crystal grain, can significantly provide semisolid pressure casting height
Intensity, plasticity and the semisolid pressure casting performance of thermally conductive aluminium alloy.
The present invention is to be described by embodiment, but do not limit the invention, referring to description of the invention, institute
Other variations of disclosed embodiment, are such as readily apparent that the professional person of this field, such variation should belong to
Within the scope of the claims in the present invention limit.
Claims (1)
1. a kind of pressure casting method of semisolid pressure casting high thermal conductivity aluminium alloy, it is characterised in that the following steps are included:
Step 1: according to the ingredient percent of aluminium alloy, select Al10Ti alloy, Al5Cr1Yb alloy, Al5Te alloy,
Aluminium ingot, 99.9% instant silicon and 99.95% magnesium ingot that Al5Be alloy and purity are 99.7% are matched as raw material
Material；
Step 2: melt aluminium ingots in 700~750 DEG C of heating, be then added account for raw material total weight be 6.6~7.4% it is instant
Silicon, 0.15~0.25% magnesium ingot, 0.3~0.5% Al10Ti alloy, 1~2% Al5Cr1Yb alloy, 0.2~0.6%
Al5Te alloy and 1~2% Al5Be alloy, stirring be fused into aluminum alloy melt；
Step 3:, using ultrasonic activation method, being 40 in ultrasonic frequency vibratory after carrying out refining degasification slagging-off to aluminum alloy melt
~50 hertz, the ultrasonic activation time be under the conditions of 20~30 seconds, it is 620~640 DEG C of aluminium that aluminum alloy melt, which is prepared into temperature,
Alloy semi-solid slurry；
Step 4: mold cavity temperature is 100~150 DEG C, injection speed is 0.5~1 meter per second, injection ratio pressure be 60~
Under the conditions of 80MPa, boost pressure are 90~120MPa and the dwell time is 4~6 seconds, by aluminium alloy semi-solid slurry semisolid pressure
Cast aluminium alloy；
Step 5: by semisolid pressure casting at aluminium alloy 520~530 DEG C solution treatment 12~14 hours, after water quenching, 175
~185 DEG C ageing treatment 6~8 hours, semisolid pressure casting high thermal conductivity aluminium alloy is obtained after furnace cooling, which leads
Hot aluminium alloy is by following mass percent at being grouped as: Si 6.6~7.4%, Mg 0.15~0.25%, Ti 0.03~
0.05%, Cr 0.05~0.1%, Yb 0.01~0.02%, Te 0.01~0.03%, Be 0.05~0.1%, Fe≤
0.15%, surplus is Al and inevitable other impurity elements, wherein the mass ratio of Cr and Yb is 5:1, other impurity elements
Single content is less than 0.05%, and for total amount less than 0.15%, the thermal coefficient of the semisolid pressure casting high thermal conductivity aluminium alloy is greater than 160W/
(mK), tensile strength is greater than 260MPa, and elongation is greater than 8%.
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| CN109396380B (en) * | 2018-11-20 | 2020-12-15 | 吴江市格瑞福金属制品有限公司 | Method for preparing high-heat-conductivity baking tray through semi-solid die-casting |
| CN109628778B (en) * | 2018-11-20 | 2020-12-15 | 吴江市格瑞福金属制品有限公司 | Preparation method of high-heat-conductivity baking tray |
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