CN108251722A - A kind of fine isometric crystal grains Al-Zn-Mg line aluminium alloys and preparation method thereof - Google Patents
A kind of fine isometric crystal grains Al-Zn-Mg line aluminium alloys and preparation method thereof Download PDFInfo
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- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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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
- 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
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Abstract
The invention discloses a kind of fine isometric crystal grains Al Zn Mg line aluminium alloys and preparation method thereof, and aluminium alloy contains alloy element Zn, Mg, Cu, Ti, B, remaining is Al and inevitable impurity element.Preparation method includes spray refining, online crystal grain refinement, online degassing and filtration, semi-continuous casting, ingot homogenization, heating and extruding, press quenching and artificial aging processing in dispensing, fusing aluminum alloy melt, stove.The present invention is by optimization design alloy into being grouped as and its preparation technology parameter, Al Zn Mg line aluminium alloys squeeze wood is made to obtain the fine uniform equiaxed grain structure of perfect recrystallization, eliminate the tissue striped and aberration of oxidation film, improve the coating mass of Al Zn Mg line aluminium alloys, oxidation film uniform color, exquisite in texture, glossiness are high, with excellent coloring effect, it is suitable for manufacturing the various aluminum alloy plate materials more demanding to intensity and decorative surface or pipe rod type material, such as shell, center, the frame of various large screen electronic products.
Description
Technical field
The invention belongs to technical field of aluminium alloy preparation, are specifically related to a kind of fine isometric crystal grains Al-Zn-Mg systems aluminium and close
Gold and preparation method thereof.
Background technology
With the electronic products such as smart mobile phone, tablet computer, liquid crystal display, smart television screen enlarging and lightening hair
Exhibition, is badly in need of the aluminum alloy casing, center or frame of high intensity to improve the bending resistance of fuselage, is to occur to avoid fuselage pressurization
Phenomena such as bending, bending, while require aluminium alloy that there is excellent heat-tinting effect again, to meet consumer to electronic product
The high-decoration requirement of appearance member.At present, electronic product casing, center or frame are mainly using 6063 alloys as generation with aluminium alloy
The Al-Mg-Si-type aluminum alloy of table.Al-Mg-Si-type aluminum alloy is middle strength aluminium alloy, although with excellent press workability
Energy and heat-tinting effect, but its intensity is generally relatively low, can not meet electronic product screen enlarging and lightening demand for development.With
7003 alloys are heat-treatable strengthened high-strength aluminum alloys for the Al-Zn-Mg line aluminium alloys of representative, although high with intensity
Advantage, but heat-tinting effect is again poor, the defects of oxidation film is usually present tissue striped, aberration, leads to Process on Aluminum Alloy Oxidation Film
Texture is not fine and smooth enough, glossiness is low, and coloring effect is poor etc., can not meet high-decoration of the consumer to electronic product appearance member
It is required that.Therefore, existing Al-Zn-Mg line aluminium alloys and preparation method thereof still have much room for improvement and develop.
Invention content
It is an object of the invention to be directed to it is above-mentioned there are problem and shortage, a kind of fine isometric crystal grains Al-Zn-Mg systems are provided
Aluminium alloy and preparation method thereof by optimization design alloy into being grouped as and its preparation technology parameter, makes Al-Zn-Mg systems aluminium
Alloy extrusion material obtains the fine uniform equiaxed grain structure of perfect recrystallization, eliminates the tissue striped and color of Process on Aluminum Alloy Oxidation Film
Difference improves the heat-tinting effect of aluminium alloy.
The technical proposal of the invention is realized in this way：
Fine isometric crystal grains Al-Zn-Mg line aluminium alloys of the present invention, its main feature is that by following mass percent into grouping
Into：Zn 5.6~5.9%, Mg 0.5~0.8%, Cu 0.3~0.5%, Ti 0.005~0.01%, B 0.001~0.002%, Fe
≤ 0.12%, Si≤0.1%, surplus other impurity for Al and inevitably, wherein, the mass ratio of Ti and B are 5:1, it is other miscellaneous
Single content≤0.01% of matter, total amount≤0.05%；
The preparation method of fine isometric crystal grains Al-Zn-Mg line aluminium alloys of the present invention, its main feature is that including the following steps：
The first step：Select the magnesium ingot and Al- that zinc ingot metal, purity that aluminium ingot, purity that purity is 99.85% are 99.9% are 99.9%
10Cu alloys and Al-5Ti-1B B alloy wires are raw material；
Second step：By aluminium ingot in 770~780 DEG C of heating fusings, then addition accounts for the zinc that raw material total weight is 5.6~5.9%
Ingot, 0.5~0.8% magnesium ingot and 3~5% Al-10Cu alloys, stirring are fused into aluminum alloy melt；
Third walks：With the argon gas that purity is 99.9% to aluminum alloy melt spray refining 10~15 minutes in stove, 30 are stood after skimming again
~40 minutes；
4th step：Aluminum alloy melt in stove is imported into chute, the Al-5Ti-1B alloys that raw material total weight is 0.1~0.2% will be accounted for
Silk, which is added in aluminum alloy melt, carries out online crystal grain refinement processing；
5th step：Aluminum alloy melt is flowed successively through and is arranged on that rotary speed on chute is 150~160 revs/min, argon flow amount is
5~6 cubes ms/h of getter and porosity is the foamed ceramic filter plate of 100~120ppi, carries out online degassing and filtration
Processing；
6th step：670~680 DEG C of casting temperature, 120~130 mm/min of casting speed, 1~2MPa of cooling water pressure,
The semi-continuous casting of aluminum alloy melt electromagnetic agitation is closed into aluminium under the conditions of 20~30kHz of electromagnetic frequency and 100~110kW of electromagnetic power
Golden ingot casting；
7th step：Aluminium alloy cast ingot is heated to 350~360 DEG C of Homogenization Treatments 2-3 hours, is further continued for being heated to 560~570
DEG C Homogenization Treatments 3-4 hours, then water mist pressure are cooled to room temperature；
8th step：Aluminium alloy cast ingot is heated to 450~460 DEG C, in 5~6 ms/min of extrusion speed, extrusion ratio 80~90, mould
Extrusion molding is carried out under the conditions of 430~440 DEG C of temperature of tool, then Water cooling to room temperature；
9th step：Extruding aluminium alloy is heated to 160~170 DEG C of timeliness 6~8 hours, tiny equiax crystal is obtained after furnace cooling
Grain Al-Zn-Mg line aluminium alloys.
Compared with prior art, the present invention has the advantages that：
（1）The present invention, into being grouped as, solves intensity and the oxidation of aluminium alloy by optimization design Al-Zn-Mg line aluminium alloys
Contradictory relation between film quality, it is ensured that aluminium alloy has the characteristics that high intensity and excellent oxidation coloring effect simultaneously；
（2）The present invention increases substantially the cleanliness factor of aluminium alloy by degassing and filtration measure online outside spray refining in stove and stove,
The tissue defects such as eliminate stomata, be mingled with, it is ensured that aluminium alloy obtains high intensity and excellent heat-tinting effect；
（3）The present invention is by using the online crystal grain refinement processing of Al-5Ti-1B B alloy wires and electromagnetic agitation semi-continuous casting technology
Prepare aluminium alloy cast ingot, the grain structure of refining aluminum alloy ingot casting, it is ensured that the tiny of perfect recrystallization is obtained after aluminium alloy extruded
Uniform equiaxed grain structure；
（4）The present invention enables aluminum alloy to squeeze wood by the homogenization of optimization design aluminium alloy cast ingot, heating and extrusion process parameters
The fine uniform equiaxed grain structure of perfect recrystallization is obtained, eliminates the tissue striped and aberration of oxidation film, improves aluminium alloy
Heat-tinting effect；
（5）The tensile strength of Al-Zn-Mg line aluminium alloys of the present invention is more than 360MPa, and elongation after fracture is more than 12%, anodic oxidation
Film uniform color, exquisite in texture, glossiness are high, have excellent coloring effect, are suitable for manufacturing various to intensity and surface dress
The more demanding aluminum alloy plate materials of decorations property or pipe rod type material.
Specific embodiment
Below to fine isometric crystal grains Al-Zn-Mg line aluminium alloys of the present invention into being grouped as meaning and content range
Restriction reason illustrates.
Fine isometric crystal grains Al-Zn-Mg line aluminium alloys of the present invention, its main feature is that by following mass percent into
It is grouped as：Zn 5.6~5.9%, Mg 0.5~0.8%, Cu 0.3~0.5%, Ti 0.005~0.01%, B 0.001~
0.002%, Fe≤0.12%, Si≤0.1%, surplus other impurity for Al and inevitably, wherein, the mass ratio of Ti and B are 5:
1, other single content≤0.01% of impurity, total amount≤0.05%；
Zn, Mg, Cu are the main alloy elements of aluminium alloy, these elements have solution strengthening effect in aluminium alloy, in addition, Zn
MgZn can also be precipitated with Mg2Al can be also precipitated in hardening constituent, Cu and Al2Cu hardening constituents further enhance the intensity of aluminium alloy.Zn、
The content of Mg, Cu are higher, and the intensity of aluminium alloy is also higher, but the quality of the oxidation film of aluminium alloy also can gradually be deteriorated, oxidation film
There is the problems such as burnt hair, obfuscation, yellowing.By being found after the system research to alloying component, when Zn contents contain less than 5.6%, Mg
When amount is less than 0.5% or Cu contents less than 0.3%, electronic product screen enlarging and lightening development pair is not achieved in the intensity of aluminium alloy
360MPa needed for aluminum alloy casing.When Zn contents, which are more than 5.9%, Mg contents, is more than 0.8% or Cu contents more than 0.5%, meeting
The intensity for leading to aluminium alloy is excessively high, and extrusion process is very difficult, and the coating mass of particularly aluminium alloy will appear notable deterioration.
When Zn contents be 5.6~5.9%, Mg contents to be 0.5~0.8%, Cu contents be 0.3~0.5% when, intensity of aluminum alloy can be balanced
With the contradictory relation of coating mass, meet electronic product to the intensity of aluminum alloy casing and coating mass requirement.
Ti, B are added in aluminum alloy melt in the form of Al-5Ti-1B B alloy wires, and main function is refining aluminum alloy ingot casting
Grain structure, improve the structural homogenity of aluminium alloy cast ingot.Contain a large amount of TiB in Al-5Ti-1B B alloy wires2Particle, Al-
The additive amount of 5Ti-1B B alloy wires is more, the TiB in aluminum alloy melt2Number of particles is also more, and grain refining effect is also better.Shen
The lot of experiments asked someone proves, when the additive amount of Al-5Ti-1B B alloy wires is more than 0.2%, a large amount of TiB2Particle can be residual
Stay in aluminium alloy, cause Aluminum alloy extrusion material turnning and milling, surface of polished occur sand holes, draw the defects of, and then influence aluminium close
The heat-tinting effect of gold.Therefore, the Al-5Ti-1B B alloy wires of selection addition 0.1~0.2%, in aluminium alloy containing 0.005~
0.01% Ti, 0.001~0.002% B, had not only met the crystal grain refinement requirement of aluminium alloy cast ingot, but also can avoid aluminium alloy extruded
Material turnning and milling, surface of polished occur sand holes, draw the defects of.
Fe, Si are inevitable impurity elements in aluminium ingot, magnesium ingot, zinc ingot metal, when Fe contents are more than that 0.12%, Si contents surpass
When 0.1%, Fe and Si can form coarse AlFeSi intermetallic compounds, and coarse AlFeSi intermetallic compounds can not only dislike
Change the mechanical property of aluminium alloy, also result in oxidized aluminum alloy non-uniform film thickness, oxidation film burnt hair, obfuscation, surface occur black line,
The defects of blackspot, borrosion hole.The present invention is by selecting zinc ingot metal, purity that aluminium ingot, purity that purity is 99.85% are 99.9%
99.9% magnesium ingot is less than or equal to 0.12%, Si contents and is less than or equal to 0.1%, avoid as main raw material(s), control Fe contents
Negative effect of Fe, Si impurity element to intensity of aluminum alloy and coating mass, it is ensured that aluminium alloy obtains required mechanical property
With heat-tinting effect.
Mn, Cr, Zr, Sc, Er etc. are the microalloy elements often added in traditional Al-Zn-Mg line aluminium alloys, these elements
Although the intensity of aluminium alloy can be improved with the crystal grain of refining aluminum alloy, the aluminide of coherence or non-coherence can be also formed with Al
Fine dispersoid phase so as to the generation that aluminium alloy is inhibited to recrystallize, enables aluminum alloy to keep the grain structure of threadiness after squeezing, and fine
The grain structure for tieing up shape is that Process on Aluminum Alloy Oxidation Film the main reason for the defects of tissue striped, aberration occurs.The present invention passes through selection
The magnesium ingot that zinc ingot metal that aluminium ingot that purity is 99.85%, purity are 99.9%, purity are 99.9% as main raw material(s), control Mn,
The single content of the impurity elements such as Cr, Zr, Sc, Er is respectively less than 0.01%, and total amount is less than 0.05%, can eliminate these elements to again
The inhibiting effect of crystallization, it is ensured that fully recrystallized when aluminium alloy extruded, obtain the fine uniform equiax crystal of perfect recrystallization
Grain tissue, avoids oxidation film from the defects of tissue striped, aberration occur, improves the heat-tinting effect of aluminium alloy.
Below to the preparation method and main technologic parameters of fine isometric crystal grains Al-Zn-Mg line aluminium alloys of the present invention
Selection meaning and reason illustrate.
The preparation method of fine isometric crystal grains Al-Zn-Mg line aluminium alloys of the present invention, its main feature is that including following step
Suddenly：
The first step：Select the magnesium ingot and Al- that zinc ingot metal, purity that aluminium ingot, purity that purity is 99.85% are 99.9% are 99.9%
10Cu alloys and Al-5Ti-1B B alloy wires are raw material；
Second step：By aluminium ingot in 770~780 DEG C of heating fusings, then addition accounts for the zinc that raw material total weight is 5.6~5.9%
Ingot, 0.5~0.8% magnesium ingot and 3~5% Al-10Cu alloys, stirring are fused into aluminum alloy melt；
Third walks：With the argon gas that purity is 99.9% to aluminum alloy melt spray refining 10~15 minutes in stove, 30 are stood after skimming again
~40 minutes；
4th step：Aluminum alloy melt in stove is imported into chute, the Al-5Ti-1B alloys that raw material total weight is 0.1~0.2% will be accounted for
Silk, which is added in aluminum alloy melt, carries out online crystal grain refinement processing；
5th step：Aluminum alloy melt is flowed successively through and is arranged on that rotary speed on chute is 150~160 revs/min, argon flow amount is
5~6 cubes ms/h of getter and porosity is the foamed ceramic filter plate of 100~120ppi, carries out online degassing and filtration
Processing；
6th step：670~680 DEG C of casting temperature, 120~130 mm/min of casting speed, 1~2MPa of cooling water pressure,
The semi-continuous casting of aluminum alloy melt electromagnetic agitation is closed into aluminium under the conditions of 20~30kHz of electromagnetic frequency and 100~110kW of electromagnetic power
Golden ingot casting；
7th step：Aluminium alloy cast ingot is heated to 350~360 DEG C of Homogenization Treatments 2-3 hours, is further continued for being heated to 560~570
DEG C Homogenization Treatments 3-4 hours, then water mist pressure are cooled to room temperature；
8th step：Aluminium alloy cast ingot is heated to 450~460 DEG C, in 5~6 ms/min of extrusion speed, extrusion ratio 80~90, mould
Extrusion molding is carried out under the conditions of 430~440 DEG C of temperature of tool, then Water cooling to room temperature；
9th step：Extruding aluminium alloy is heated to 160~170 DEG C of timeliness 6~8 hours, tiny equiax crystal is obtained after furnace cooling
Grain Al-Zn-Mg line aluminium alloys.
Stomata, be mingled with, the defects of coarse grains and structural constituent are uneven, can all reduce the anodic oxidation film quality of aluminium alloy
Amount, therefore, the degree of purity, crystal grain thinning tissue and elimination structural constituent unevenness for improving aluminium alloy are to enable aluminum alloy to obtain excellent oxygen
Change the basic guarantee of coloring effect.
In order to improve the cleanliness factor of aluminium alloy, it is 99.9% argon gas to aluminum alloy melt in stove that the present invention uses purity first
Spray refining 10~15 minutes, stands 30~40 minutes again after skimming, then use getter and foamed ceramics mistake on chute again
Filter carries out online degassing and filtration, and deep purifying is carried out to aluminum alloy melt, and the Gas content for enabling aluminum alloy to liquid is less than 0.09 milliliter/100
Gram aluminium, non-metallic inclusion content PoDFA are less than the cleanliness factor of 0.06 square millimeter/kilogram, significantly aluminium alloy, it is ensured that aluminium closes
Gold obtains excellent heat-tinting effect.
The defects of in order to eliminate the coarse grains of aluminium alloy cast ingot and uneven structural constituent, the present invention using 0.1~
On the basis of the 0.2% online crystal grain refinement processing of Al-5Ti-1B B alloy wires, then using the preparation of electromagnetic agitation semi-continuous casting technology
Aluminium alloy cast ingot, the crystal grain of further refining aluminum alloy ingot casting and improvement structural constituent uniformity.Applicant passes through further investigation
After find, in 670~680 DEG C of casting temperature, 120~130 mm/min of casting speed, 1~2MPa of cooling water pressure, electromagnetism
The semi-continuous casting of aluminum alloy melt electromagnetic agitation is cast into aluminium alloy under the conditions of 20~30kHz of frequency and 100~110kW of electromagnetic power
Ingot, the crystallite dimension of aluminium alloy cast ingot are less than 60 microns, could meet the extruding requirement of aluminium alloy cast ingot, just can ensure that aluminium alloy
The fine uniform equiaxed grain structure requirement of perfect recrystallization is obtained after extruding.
The purpose of Homogenization Treatments is to eliminate the macro microsegregation of inside ingot alloying element, makes alloying element fully solid
It is molten, coarse InterMetallic Compound is made fully to melt solid solution.It is carried out by the Homogenization Treatment to aluminium alloy cast ingot of the present invention
It is found after system research, aluminium alloy cast ingot is heated to 350~360 DEG C of Homogenization Treatments 2-3 hours, is further continued for being heated to 560
~570 DEG C of Homogenization Treatments 3-4 hours, then water mist pressure are cooled to room temperature, and can just completely eliminate inside ingot Zn, Mg member
The macro microsegregation of element, makes coarse InterMetallic Compound fully melt solid solution, meets electronic product casing to Al-Zn-Mg systems height
The structural constituent uniformity requirement that strength aluminium alloy ingot casting squeezes.
The fine uniform equiaxed grain structure for enabling aluminum alloy to squeeze wood acquisition perfect recrystallization is to eliminate Process on Aluminum Alloy Oxidation Film
There is the defects of tissue striped, aberration, improve the key of oxidized aluminum alloy coloring effect.Applicant passes through to aluminium of the present invention
The extrusion process and parameter of alloy are found after carrying out system research, and aluminium alloy cast ingot is heated to 450~460 DEG C, are squeezing speed
Extrusion molding is carried out under the conditions of 5~6 ms/min of degree, extrusion ratio 80~90,430~440 DEG C of mold temperature, then Water cooling
To room temperature, aluminium alloy perfect recrystallization could be induced, obtains the equiaxed grain structure of fine uniform, meets heat-tinting to aluminium alloy
Institutional framework requirement, the defects of eliminating tissue striped, the aberration of Process on Aluminum Alloy Oxidation Film obtains the heat-tinting effect of high quality
Fruit.If extrusion process parameters not in above-mentioned matching range, can not obtain the fine uniform equi-axed crystal of perfect recrystallization
Tissue, can only obtain the grain structure of threadiness either coarse recrystallization fine grained texture or by fibrous crystal grain with tying again
The duplex grain structure that Jingjing grain collectively forms, and be also possible that deformation stress in aluminium alloys can be too big, squeeze it is difficult or
The problems such as desired intensity of aluminum alloy can not be obtained.
Applicant, will by being found after the artificial aging technique progress system research to Aluminum alloy extrusion material of the present invention
Extruding aluminium alloy is heated to 160~170 DEG C of timeliness 6~8 hours, and then furnace cooling to room temperature, Al-Zn-Mg line aluminium alloys can
Required aging strength is obtained, meets to electronic product the intensity requirement to aluminum alloy casing.If aging temp is less than 160 DEG C
Or aging time is less than 6 hours, then timeliness effect is insufficient, and aging temp is higher than 170 DEG C or aging time is small more than 8
When, then it will appear overaging, desired intensity of aluminum alloy be not achieved.
Technical scheme of the present invention is further described with reference to specific embodiment and comparative example, so as to more preferable
Understanding technical scheme of the present invention.
Embodiment 1：
Al-Zn-Mg line aluminium alloys are by following mass percent into being grouped as：Zn 5.6%, Mg 0.8%, Cu 0.3%, Ti
0.005%, B 0.001%, Fe≤0.12%, Si≤0.1%, surplus are Al and inevitable other impurity, and other impurity are single
Content≤0.01%, total amount≤0.05%；Preparation method includes the following steps：
The first step：Select the magnesium ingot and Al- that zinc ingot metal, purity that aluminium ingot, purity that purity is 99.85% are 99.9% are 99.9%
10Cu alloys and Al-5Ti-1B B alloy wires are raw material；
Second step：By aluminium ingot in 780 DEG C of heating fusings, then addition accounts for the zinc ingot metal, 0.8% magnesium that raw material total weight is 5.6%
Ingot and 3% Al-10Cu alloys, stirring are fused into aluminum alloy melt；
Third walks：With the argon gas that purity is 99.9% to aluminum alloy melt spray refining 15 minutes in stove, 30 points are stood after skimming again
Clock；
4th step：Aluminum alloy melt in stove is imported into chute, the Al-5Ti-1B B alloy wires that raw material total weight is 0.1% will be accounted for and added in
Online crystal grain refinement processing is carried out into aluminum alloy melt；
5th step：Aluminum alloy melt is flowed successively through and is arranged on that rotary speed on chute is 150 revs/min, argon flow amount is 6 cubes
M/h getter and porosity be 100ppi foamed ceramic filter plate, carry out online degassing and filtration processing；
6th step：In 680 DEG C of casting temperature, 120 mm/min of casting speed, cooling water pressure 2MPa, electromagnetic frequency 20kHz
With under the conditions of electromagnetic power 110kW by the semi-continuous casting of aluminum alloy melt electromagnetic agitation into aluminium alloy cast ingot；
7th step：Aluminium alloy cast ingot is heated to 350 DEG C of Homogenization Treatments 3 hours, is further continued for being heated to 570 DEG C of Homogenization Treatments
3 hours, then water mist pressure was cooled to room temperature；
8th step：Aluminium alloy cast ingot is heated to 450 DEG C, in 5 ms/min of extrusion speed, extrusion ratio 90,4440 DEG C of mold temperature
Under the conditions of carry out extrusion molding, then Water cooling to room temperature；
9th step：Extruding aluminium alloy is heated to 160 DEG C of timeliness 8 hours, fine isometric crystal grains Al-Zn- is obtained after furnace cooling
Mg line aluminium alloys.
Embodiment 2：
Al-Zn-Mg line aluminium alloys are by following mass percent into being grouped as：Zn 5.7%, Mg 0.8%, Cu 0.4%, Ti
0.0075%, B 0.0015%, Fe≤0.12%, Si≤0.1%, surplus other impurity, other impurity lists for Al and inevitably
A content≤0.01%, total amount≤0.05%；Preparation method includes the following steps：
The first step：Select the magnesium ingot and Al- that zinc ingot metal, purity that aluminium ingot, purity that purity is 99.85% are 99.9% are 99.9%
10Cu alloys and Al-5Ti-1B B alloy wires are raw material；
Second step：By aluminium ingot in 775 DEG C of heating fusings, then addition accounts for the zinc ingot metal, 0.8% magnesium that raw material total weight is 5.7%
Ingot and 4% Al-10Cu alloys, stirring are fused into aluminum alloy melt；
Third walks：With the argon gas that purity is 99.9% to aluminum alloy melt spray refining 12 minutes in stove, 35 points are stood after skimming again
Clock；
4th step：Aluminum alloy melt in stove is imported into chute, the Al-5Ti-1B B alloy wires that raw material total weight is 0.15% will be accounted for and added
Enter into aluminum alloy melt to carry out online crystal grain refinement processing；
5th step：Aluminum alloy melt is flowed successively through and is arranged on that rotary speed on chute is 155 revs/min, argon flow amount is 5.5 to stand
Square m/h of getter and porosity is the foamed ceramic filter plate of 110ppi, carries out online degassing and filtration processing；
6th step：In 675 DEG C of casting temperature, 130 mm/min of casting speed, cooling water pressure 1.5MPa, electromagnetic frequency
By the semi-continuous casting of aluminum alloy melt electromagnetic agitation into aluminium alloy cast ingot under the conditions of 25kHz and electromagnetic power 100kW；
7th step：Aluminium alloy cast ingot is heated to 355 DEG C of Homogenization Treatments 2.5 hours, is further continued for being heated at 570 DEG C of homogenization
Reason 3 hours, then water mist pressure are cooled to room temperature；
8th step：Aluminium alloy cast ingot is heated to 460 DEG C, in 5 ms/min of extrusion speed, extrusion ratio 80,440 DEG C of mold temperature
Under the conditions of carry out extrusion molding, then Water cooling to room temperature；
9th step：Extruding aluminium alloy is heated to 165 DEG C of timeliness 7 hours, fine isometric crystal grains Al-Zn- is obtained after furnace cooling
Mg line aluminium alloys.
Embodiment 3：
Al-Zn-Mg line aluminium alloys are by following mass percent into being grouped as：Zn 5.8%, Mg 0.6%, Cu 0.4%, Ti
0.01%, B 0.002%, Fe≤0.12%, Si≤0.1%, surplus are Al and inevitable other impurity, and other impurity are single to be contained
Amount≤0.01%, total amount≤0.05%；Preparation method includes the following steps：
The first step：Select the magnesium ingot and Al- that zinc ingot metal, purity that aluminium ingot, purity that purity is 99.85% are 99.9% are 99.9%
10Cu alloys and Al-5Ti-1B B alloy wires are raw material；
Second step：By aluminium ingot in 770 DEG C of heating fusings, then addition accounts for the zinc ingot metal, 0.6% magnesium that raw material total weight is 5.8%
Ingot and 4% Al-10Cu alloys, stirring are fused into aluminum alloy melt；
Third walks：With the argon gas that purity is 99.9% to aluminum alloy melt spray refining 15 minutes in stove, 30 points are stood after skimming again
Clock；
4th step：Aluminum alloy melt in stove is imported into chute, the Al-5Ti-1B B alloy wires that raw material total weight is 0.2% will be accounted for and added in
Online crystal grain refinement processing is carried out into aluminum alloy melt；
5th step：Aluminum alloy melt is flowed successively through and is arranged on that rotary speed on chute is 160 revs/min, argon flow amount is 5 cubes
M/h getter and porosity be 120ppi foamed ceramic filter plate, carry out online degassing and filtration processing；
6th step：In 680 DEG C of casting temperature, 120 mm/min of casting speed, cooling water pressure 2MPa, electromagnetic frequency 30kHz
With under the conditions of electromagnetic power 110kW by the semi-continuous casting of aluminum alloy melt electromagnetic agitation into aluminium alloy cast ingot；
7th step：Aluminium alloy cast ingot is heated to 360 DEG C of Homogenization Treatments 2 hours, is further continued for being heated to 560 DEG C of Homogenization Treatments
4 hours, then water mist pressure was cooled to room temperature；
8th step：Aluminium alloy cast ingot is heated to 460 DEG C, in 6 ms/min of extrusion speed, extrusion ratio 80,440 DEG C of mold temperature
Under the conditions of carry out extrusion molding, then Water cooling to room temperature；
9th step：Extruding aluminium alloy is heated to 170 DEG C of timeliness 6 hours, fine isometric crystal grains Al-Zn- is obtained after furnace cooling
Mg line aluminium alloys.
Embodiment 4：
Al-Zn-Mg line aluminium alloys are by following mass percent into being grouped as：Zn 5.6%, Mg 0.5%, Cu 0.3%, Ti
0.005%, B 0.001%, Fe≤0.12%, Si≤0.1%, surplus are Al and inevitable other impurity, and other impurity are single
Content≤0.01%, total amount≤0.05%；Preparation method includes the following steps：
The first step：Select the magnesium ingot and Al- that zinc ingot metal, purity that aluminium ingot, purity that purity is 99.85% are 99.9% are 99.9%
10Cu alloys and Al-5Ti-1B B alloy wires are raw material；
Second step：By aluminium ingot in 780 DEG C of heating fusings, then addition accounts for the zinc ingot metal, 0.5% magnesium that raw material total weight is 5.6%
Ingot and 3% Al-10Cu alloys, stirring are fused into aluminum alloy melt；
Third walks：With the argon gas that purity is 99.9% to aluminum alloy melt spray refining 15 minutes in stove, 40 points are stood after skimming again
Clock；
4th step：Aluminum alloy melt in stove is imported into chute, the Al-5Ti-1B B alloy wires that raw material total weight is 0.1% will be accounted for and added in
Online crystal grain refinement processing is carried out into aluminum alloy melt；
5th step：Aluminum alloy melt is flowed successively through and is arranged on that rotary speed on chute is 150 revs/min, argon flow amount is 6 cubes
M/h getter and porosity be 100ppi foamed ceramic filter plate, carry out online degassing and filtration processing；
6th step：In 680 DEG C of casting temperature, 120 mm/min of casting speed, cooling water pressure 1MPa, electromagnetic frequency 25kHz
With under the conditions of electromagnetic power 105kW by the semi-continuous casting of aluminum alloy melt electromagnetic agitation into aluminium alloy cast ingot；
7th step：Aluminium alloy cast ingot is heated to 355 DEG C of Homogenization Treatments 2.5 hours, is further continued for being heated at 565 DEG C of homogenization
Reason 3.5 hours, then water mist pressure are cooled to room temperature；
8th step：Aluminium alloy cast ingot is heated to 455 DEG C, in 5.5 ms/min of extrusion speed, extrusion ratio 85, mold temperature 435
Extrusion molding is carried out under the conditions of DEG C, then Water cooling to room temperature；
9th step：Extruding aluminium alloy is heated to 165 DEG C of timeliness 7 hours, fine isometric crystal grains Al-Zn- is obtained after furnace cooling
Mg line aluminium alloys.
Embodiment 5：
Al-Zn-Mg line aluminium alloys are by following mass percent into being grouped as：Zn 5.9%, Mg 0.8%, Cu 0.5%, Ti
0.01%, B 0.002%, Fe≤0.12%, Si≤0.1%, surplus are Al and inevitable other impurity, and other impurity are single to be contained
Amount≤0.01%, total amount≤0.05%；Preparation method includes the following steps：
The first step：Select the magnesium ingot and Al- that zinc ingot metal, purity that aluminium ingot, purity that purity is 99.85% are 99.9% are 99.9%
10Cu alloys and Al-5Ti-1B B alloy wires are raw material；
Second step：By aluminium ingot in 770 DEG C of heating fusings, then addition accounts for the zinc ingot metal, 0.8% magnesium that raw material total weight is 5.9%
Ingot and 5% Al-10Cu alloys, stirring are fused into aluminum alloy melt；
Third walks：With the argon gas that purity is 99.9% to aluminum alloy melt spray refining 13 minutes in stove, 35 points are stood after skimming again
Clock；
4th step：Aluminum alloy melt in stove is imported into chute, the Al-5Ti-1B B alloy wires that raw material total weight is 0.2% will be accounted for and added in
Online crystal grain refinement processing is carried out into aluminum alloy melt；
5th step：Aluminum alloy melt is flowed successively through and is arranged on that rotary speed on chute is 155 revs/min, argon flow amount is 5.5 to stand
Square m/h of getter and porosity is the foamed ceramic filter plate of 110ppi, carries out online degassing and filtration processing；
6th step：In 675 DEG C of casting temperature, 125 mm/min of casting speed, cooling water pressure 1.5MPa, electromagnetic frequency
By the semi-continuous casting of aluminum alloy melt electromagnetic agitation into aluminium alloy cast ingot under the conditions of 20kHz and electromagnetic power 110kW；
7th step：Aluminium alloy cast ingot is heated to 360 DEG C of Homogenization Treatments 2 hours, is further continued for being heated to 560 DEG C of Homogenization Treatments
4 hours, then water mist pressure was cooled to room temperature；
8th step：Aluminium alloy cast ingot is heated to 450 DEG C, in 5 ms/min of extrusion speed, extrusion ratio 90,430 DEG C of mold temperature
Under the conditions of carry out extrusion molding, then Water cooling to room temperature；
9th step：Extruding aluminium alloy is heated to 165 DEG C of timeliness 7 hours, fine isometric crystal grains Al-Zn- is obtained after furnace cooling
Mg line aluminium alloys.
Comparative example 1：
Al-Zn-Mg line aluminium alloys are by following mass percent into being grouped as：Zn 5.6%, Mg 0.8%, Cu 0.3%, Ti
0.005%, B 0.001%, Fe≤0.12%, Si≤0.1%, surplus are Al and inevitable other impurity, and other impurity are single
Content≤0.01%, total amount≤0.05%；Preparation method includes the following steps：
The first step：Select the magnesium ingot and Al- that zinc ingot metal, purity that aluminium ingot, purity that purity is 99.85% are 99.9% are 99.9%
10Cu alloys and Al-5Ti-1B B alloy wires are raw material；
Second step：By aluminium ingot in 780 DEG C of heating fusings, then addition accounts for the zinc ingot metal, 0.8% magnesium that raw material total weight is 5.6%
Ingot and 3% Al-10Cu alloys, stirring are fused into aluminum alloy melt；
Third walks：With the argon gas that purity is 99.9% to aluminum alloy melt spray refining 15 minutes in stove, 30 points are stood after skimming again
Clock；
4th step：Aluminum alloy melt in stove is imported into chute, the Al-5Ti-1B B alloy wires that raw material total weight is 0.1% will be accounted for and added in
Online crystal grain refinement processing is carried out into aluminum alloy melt；
5th step：Aluminum alloy melt is flowed successively through and is arranged on that rotary speed on chute is 150 revs/min, argon flow amount is 6 cubes
M/h getter and porosity be 100ppi foamed ceramic filter plate, carry out online degassing and filtration processing；
6th step：In 680 DEG C of casting temperature, 120 mm/min of casting speed, cooling water pressure 2MPa, electromagnetic frequency 20kHz
With under the conditions of electromagnetic power 110kW by the semi-continuous casting of aluminum alloy melt electromagnetic agitation into aluminium alloy cast ingot；
7th step：Aluminium alloy cast ingot is heated to 350 DEG C of Homogenization Treatments 3 hours, is further continued for being heated to 570 DEG C of Homogenization Treatments
3 hours, then water mist pressure was cooled to room temperature；
8th step：Aluminium alloy cast ingot is heated to 430 DEG C, in 5 ms/min of extrusion speed, extrusion ratio 90,4440 DEG C of mold temperature
Under the conditions of carry out extrusion molding, then Water cooling to room temperature；
9th step：Extruding aluminium alloy is heated to 160 DEG C of timeliness 8 hours, Al-Zn-Mg line aluminium alloys are obtained after furnace cooling.
Comparative example 2：
Al-Zn-Mg line aluminium alloys are by following mass percent into being grouped as：Zn 5.7%, Mg 0.8%, Cu 0.4%, Ti
0.0075%, B 0.0015%, Fe≤0.12%, Si≤0.1%, surplus other impurity, other impurity lists for Al and inevitably
A content≤0.01%, total amount≤0.05%；Preparation method includes the following steps：
The first step：Select the magnesium ingot and Al- that zinc ingot metal, purity that aluminium ingot, purity that purity is 99.85% are 99.9% are 99.9%
10Cu alloys and Al-5Ti-1B B alloy wires are raw material；
Second step：By aluminium ingot in 775 DEG C of heating fusings, then addition accounts for the zinc ingot metal, 0.8% magnesium that raw material total weight is 5.7%
Ingot and 4% Al-10Cu alloys, stirring are fused into aluminum alloy melt；
Third walks：With the argon gas that purity is 99.9% to aluminum alloy melt spray refining 12 minutes in stove, 35 points are stood after skimming again
Clock；
4th step：Aluminum alloy melt in stove is imported into chute, the Al-5Ti-1B B alloy wires that raw material total weight is 0.15% will be accounted for and added
Enter into aluminum alloy melt to carry out online crystal grain refinement processing；
5th step：Aluminum alloy melt is flowed successively through and is arranged on that rotary speed on chute is 155 revs/min, argon flow amount is 5.5 to stand
Square m/h of getter and porosity is the foamed ceramic filter plate of 110ppi, carries out online degassing and filtration processing；
6th step：In 675 DEG C of casting temperature, 130 mm/min of casting speed, cooling water pressure 1.5MPa, electromagnetic frequency
By the semi-continuous casting of aluminum alloy melt electromagnetic agitation into aluminium alloy cast ingot under the conditions of 25kHz and electromagnetic power 100kW；
7th step：Aluminium alloy cast ingot is heated to 355 DEG C of Homogenization Treatments 2.5 hours, is further continued for being heated at 570 DEG C of homogenization
Reason 3 hours, then water mist pressure are cooled to room temperature；
8th step：Aluminium alloy cast ingot is heated to 460 DEG C, in 5 ms/min of extrusion speed, extrusion ratio 60,440 DEG C of mold temperature
Under the conditions of carry out extrusion molding, then Water cooling to room temperature；
9th step：Extruding aluminium alloy is heated to 165 DEG C of timeliness 7 hours, Al-Zn-Mg line aluminium alloys are obtained after furnace cooling.
By professional standard YB/T4290-2012《Largest grain size rank assay method in metallographic detection faces》, implementing
It is sampled on Al-Zn-Mg line aluminium alloys prepared by example and comparative example, sample is after grinding, polishing and corrode, in LEICA-300 types
The microscopic structure in aluminium alloy extruded direction is observed under metallographic microscope, measures the average-size of crystal grain, testing result is such as
Shown in table 1.
By standard GB/T/T16865-2013《Deform aluminium, magnesium and its alloy fabricated product tension test sample and side
Method》, Al-Zn-Mg line aluminium alloys prepared by embodiment and comparative example are processed into standard tensile specimen, in HGF-500 type electronics
Room temperature tensile is carried out on cupping machine, rate of extension is 2 mm/mins, detects the tensile strength of aluminium alloy and elongation of having no progeny
Rate, testing result are as shown in table 1.
By standard GB/T/T12967.4-2014《Aluminium and aluminium alloy anode oxide film detection method》, by embodiment and right
Al-Zn-Mg line aluminium alloys prepared by ratio are processed into standard sample, in sulfuric acid 80g/L, citric acid 9g/L, lactic acid 7g/L, electric current
Anodic oxidation is carried out under the conditions of density 1.5A/dm2, voltage 10V, oxidization time 30min, detects the coating mass of aluminium alloy,
Testing result is as shown in table 1.
From table 1, it can be seen that, the tensile strength of the Al-Zn-Mg line aluminium alloys prepared by embodiment 1-5 is more than 360MPa, has no progeny and stretches
Long rate is more than 12%, and metallographic microstructure is the fine isometric crystal grains tissue of perfect recrystallization, and it is micro- that average grain size is less than 40
Rice, anode oxide film inorganization striped and aberration, uniform color, exquisite in texture, glossiness is high, shows Al- prepared by the present invention
Zn-Mg line aluminium alloys have intensity height and excellent anodic oxidation effect.Comparative example 1 is added due to the ingot casting of Al-Zn-Mg line aluminium alloys
Heat is less than 450 DEG C, and comparative example 2 is since Al-Zn-Mg systems extrusion ratio is less than 80, although the mechanical property of aluminium alloy is all higher,
For metallography microscope all for fibrous crystal and recrystal grain, average grain size is larger, cause anode oxide film there are tissue striped and
Aberration, uneven color, texture is poor, and glossiness is low, can not meet the high-decoration requirement of electronic product appearance member.
The present invention is described by embodiment, but is not limited the invention, with reference 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 (2)
1. a kind of fine isometric crystal grains Al-Zn-Mg line aluminium alloys, it is characterised in that the aluminium alloy by following mass percent into
It is grouped as：Zn 5.6~5.9%, Mg 0.5~0.8%, Cu 0.3~0.5%, Ti 0.005~0.01%, B 0.001~
0.002%, Fe≤0.12%, Si≤0.1%, surplus other impurity for Al and inevitably, wherein, the mass ratio of Ti and B are 5:
1, other single content≤0.01% of impurity, total amount≤0.05%.
2. a kind of preparation method of fine isometric crystal grains Al-Zn-Mg line aluminium alloys described in claim 1, it is characterised in that including
Following steps：
The first step：Select the magnesium ingot and Al- that zinc ingot metal, purity that aluminium ingot, purity that purity is 99.85% are 99.9% are 99.9%
10Cu alloys and Al-5Ti-1B B alloy wires are raw material；
Second step：By aluminium ingot in 770~780 DEG C of heating fusings, then addition accounts for the zinc that raw material total weight is 5.6~5.9%
Ingot, 0.5~0.8% magnesium ingot and 3~5% Al-10Cu alloys, stirring are fused into aluminum alloy melt；
Third walks：With the argon gas that purity is 99.9% to aluminum alloy melt spray refining 10~15 minutes in stove, 30 are stood after skimming again
~40 minutes；
4th step：Aluminum alloy melt in stove is imported into chute, the Al-5Ti-1B alloys that raw material total weight is 0.1~0.2% will be accounted for
Silk, which is added in aluminum alloy melt, carries out online crystal grain refinement processing；
5th step：Aluminum alloy melt is flowed successively through and is arranged on that rotary speed on chute is 150~160 revs/min, argon flow amount is
5~6 cubes ms/h of getter and porosity is the foamed ceramic filter plate of 100~120ppi, carries out online degassing and filtration
Processing；
6th step：670~680 DEG C of casting temperature, 120~130 mm/min of casting speed, 1~2MPa of cooling water pressure,
The semi-continuous casting of aluminum alloy melt electromagnetic agitation is closed into aluminium under the conditions of 20~30kHz of electromagnetic frequency and 100~110kW of electromagnetic power
Golden ingot casting；
7th step：Aluminium alloy cast ingot is heated to 350~360 DEG C of Homogenization Treatments 2-3 hours, is further continued for being heated to 560~570
DEG C Homogenization Treatments 3-4 hours, then water mist pressure are cooled to room temperature；
8th step：Aluminium alloy cast ingot is heated to 450~460 DEG C, in 5~6 ms/min of extrusion speed, extrusion ratio 80~90, mould
Extrusion molding is carried out under the conditions of 430~440 DEG C of temperature of tool, then Water cooling to room temperature；
9th step：Extruding aluminium alloy is heated to 160~170 DEG C of timeliness 6~8 hours, tiny equiax crystal is obtained after furnace cooling
Grain Al-Zn-Mg line aluminium alloys.
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