CN108315612B - A kind of high tough anticorrosive Al-Zn-Mg line aluminium alloy and preparation method thereof - Google Patents
A kind of high tough anticorrosive Al-Zn-Mg line aluminium alloy and preparation method thereof Download PDFInfo
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- CN108315612B CN108315612B CN201810096324.8A CN201810096324A CN108315612B CN 108315612 B CN108315612 B CN 108315612B CN 201810096324 A CN201810096324 A CN 201810096324A CN 108315612 B CN108315612 B CN 108315612B
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- 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
- C22C1/026—Alloys based on aluminium
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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
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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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
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- 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
- C22F1/04—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
- C22F1/053—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 zinc as the next major constituent
Abstract
The invention discloses a kind of high tough anticorrosive Al-Zn-Mg line aluminium alloys and preparation method thereof, and aluminium alloy contains main alloying element Zn, Mg, Cu and micro alloying element Mn, Cr, Er, Ti, B etc., 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 fusing aluminum alloy melt, furnace.The present invention is by optimization design alloy at being grouped as and its preparation process, recrystallization and crystal grain is inhibited to grow up, Al-Zn-Mg line aluminium alloy is set to obtain fibrous crystal tissue along the direction of extrusion, improve the fracture toughness and corrosion resistance of Aluminum alloy extrusion material, Aluminum alloy extrusion material has excellent comprehensive performance, is suitable for manufacturing the transport facilitys lightweight aluminiums such as automobile, rail vehicle, ship, aircraft.
Description
Technical field
The invention belongs to technical field of aluminium alloy preparation, are specifically related to a kind of high tough anticorrosive Al-Zn-Mg system aluminium conjunction
Gold and preparation method thereof.
Background technique
With the light-weighted development of the transport facilitys such as automobile, rail vehicle, ship, aircraft, aluminium alloy is transported in traffic
Application on defeated tool is growing.Transport facility is more demanding to the comprehensive performance of aluminium alloy, such as with higher strong
Degree, fracture toughness and corrosion resistance, with safety, impact resistance and the resistance to persistence etc. for improving transport facility.Al-
Zn-Mg line aluminium alloy is heat-treatable strengthened high-strength aluminum alloy, although having the advantages that intensity is high, is used for communications and transportation
When tool, generally existing fracture toughness deficiency and the larger problem of corrosion susceptibility, main cause is Al-Zn-Mg line aluminium alloy
Alloying element content it is higher, high-alloying leads between strength and toughness that there are biggish restricting relation, highdensity analysis
Hardening constituent is assembled in crystal boundary and is easy to cause stress corrosion and grain boundary corrosion etc. out.Fine aluminide is formed by multicomponent microalloying
Disperse phase inhibits recrystallization and crystal grain to grow up, and keeps the fibrous crystal tissue of extrusion process state, can improve the disconnected of aluminium alloy simultaneously
Split toughness and corrosion resistance.But the prior art can not also make Al-Zn-Mg line aluminium alloy obtain complete fiber in the direction of extrusion
Crystalline substance tissue, makes the raising of fracture toughness and corrosion resistance nevertheless suffer from biggish limitation.Therefore, existing Al-Zn-Mg system aluminium closes
Gold and preparation method thereof still has much room for improvement and develops.
Summary of the invention
It is an object of the invention to there are problem and shortage for above-mentioned, a kind of high tough anticorrosive Al-Zn-Mg system is provided
Aluminium alloy and preparation method thereof inhibits recrystallization and crystal grain long by optimization design alloy at being grouped as and its preparation process
Greatly, it enables aluminum alloy to obtain complete fibrous crystal tissue along the direction of extrusion, while improving the fracture toughness and anti-corruption of Aluminum alloy extrusion material
Corrosion energy.
The technical scheme of the present invention is realized as follows:
The tough anticorrosive Al-Zn-Mg line aluminium alloy of height of the present invention, its main feature is that by following mass percent at
It is grouped as: Zn 5.6~5.9%, Mg 0.5~0.8%, Cu 0.3~0.5%, Mn 0.4~0.6%, Cr 0.2~0.3%, Er
0.2~0.3%, Ti 0.02~0.03%, B 0.004~0.006%, Fe≤0.15%, Si≤0.1%, surplus are Al and can not keep away
The other impurity exempted from, wherein the mass ratio of Mn, Cr, Er are 2:1:1, inevitable other single content≤0.05% of impurity,
Total amount≤0.15%.
The preparation method of the tough anticorrosive Al-Zn-Mg line aluminium alloy of height of the present invention, its main feature is that including following step
It is rapid:
Step 1: selecting Al-20Cu alloy, Al-20Mn alloy, Al-10Cr alloy, Al-10Er alloy, Al-5Ti-1B
The magnesium ingot that zinc ingot metal that aluminium ingot that alloy wire and purity are 99.7%, purity are 99.9%, purity are 99.9% is as raw material；
Step 2: aluminium ingot is melted in 770~780 DEG C of heating, being then added and accounting for raw material total weight is 5.6~5.9%
Zinc ingot metal, 0.5~0.8% magnesium ingot, 1.5~2.5% Al-20Cu alloy, 2~3% Al-20Mn alloy, 2~3% Al-10Cr
Alloy and 2~3% Al-10Er alloy, stirring be fused into aluminum alloy melt；
Step 3: spray refining is carried out 10~15 minutes to aluminum alloy melt in furnace with carbon trichloride refining agent, it is quiet after skimming
It sets 30~40 minutes；
Step 4: aluminum alloy melt in furnace is imported chute, Al-5Ti-1B of the raw material total weight for 0.4~0.6% will be accounted for
Alloy wire, which is added in aluminum alloy melt, carries out online crystal grain refinement processing；
Rotation speed is set on chute for 150~160 revs/min, argon gas stream step 5: aluminum alloy melt is flowed successively through
The foamed ceramic filter plate that the getter and porosity that amount is 5~6 cubes ms/h are 30~40ppi, carries out online degasification
Filter processing；
Step 6: by aluminum alloy melt in 670~680 DEG C of casting temperature, 110~120 mm/min of casting speed, cooling
Semi-continuous casting is at aluminium alloy cast ingot under the conditions of 1~2MPa of water pressure；
Step 7: aluminium alloy cast ingot is heated to 450~460 DEG C of Homogenization Treatments 3-4 hours, it is further continued for being heated to 550
~560 DEG C Homogenization Treatments 2-3 hours, then water mist pressure be cooled to room temperature；
Step 8: aluminium alloy cast ingot is heated to 520~530 DEG C, 7~8 ms/min of extrusion speed, extrusion ratio 60~
Extrusion molding is carried out under the conditions of 70, is then cooled by water to room temperature；
Step 9: extruding aluminium alloy is heated to 150~160 DEG C of timeliness 9~10 hours, obtained after furnace cooling high tough
Anticorrosive Al-Zn-Mg line aluminium alloy.
Compared with prior art, the invention has the following beneficial effects:
(1) present invention is by optimization design specific alloying component composition, solve Al-Zn-Mg line aluminium alloy intensity,
Contradictory relation between fracture toughness and corrosion resistance, it is ensured that aluminium alloy can have simultaneously high-intensitive, high-fracture toughness and
The advantages of excellent corrosion protection energy；
(2) present invention is handled and optimization design semicontinuous casting technique parameter, control aluminium alloy by online crystal grain refinement
The crystallite dimension of ingot casting is 200~300 microns, it is ensured that aluminium alloy cast ingot can obtain complete fibrous crystal tissue after squeezing；
(3) present invention inhibits recrystallization and crystal grain to grow up, strictly by Mn, Cr, Er element of compound addition special component
The homogenization and extrusion process parameters for controlling aluminium alloy cast ingot, enable aluminum alloy to obtain complete fibrous crystal tissue in the direction of extrusion,
The fracture toughness and corrosion resistance of aluminium alloy are improved simultaneously；
(4) tensile strength of aluminium alloy of the present invention is greater than 400MPa, and elongation after fracture is greater than 14%, and fracture toughness is greater than
55KIC, stress corrosion resistant test are greater than 40 days, have the advantages that high-intensitive, high-fracture toughness and excellent corrosion protection energy.
Specific embodiment
Below anticorrosive Al-Zn-Mg line aluminium alloy tough to height of the present invention at being grouped as meaning and content range
Restriction reason is illustrated.
The tough anticorrosive Al-Zn-Mg line aluminium alloy of height of the present invention, its main feature is that by following mass percent at
It is grouped as: Zn 5.6~5.9%, Mg 0.5~0.8%, Cu 0.3~0.5%, Mn 0.4~0.6%, Cr 0.2~0.3%, Er
0.2~0.3%, Ti 0.02~0.03%, B 0.004~0.006%, Fe≤0.15%, Si≤0.1%, surplus are Al and can not keep away
The other impurity exempted from, wherein the mass ratio of Mn, Cr, Er are 2:1:1, inevitable other single content≤0.05% of impurity,
Total amount≤0.15%.
Zn, Mg, Cu are the main alloy elements of aluminium alloy, these elements are in aluminium alloy in addition to solution strengthening effect
Outside, MgZn can be also precipitated in Zn and Mg2Al can be also precipitated in hardening constituent, Cu and Al2Cu hardening constituent enhances the intensity of aluminium alloy.Zn,Mg,
The content of Cu is higher, and the intensity of aluminium alloy is also higher, but fracture toughness can be gradually reduced, and Sensitivity of Stress Corrosion increases.Application
People by being found after the system research to alloying component, when Zn content less than 5.6%, Mg content less than 0.5% or Cu content is small
When 0.3%, 400MPa is not achieved in the intensity of aluminium alloy.When Zn content is big greater than 0.8% or Cu content greater than 5.9%, Mg content
When 0.5%, the fracture toughness and corrosion resistance of aluminium alloy can significantly deteriorate.When Zn content is that 5.6~5.9%, Mg content is
When 0.5~0.8%, Cu content are 0.3~0.5%, it can balance between the intensity, fracture toughness and corrosion resistance of aluminium alloy
Contradictory relation, it is ensured that aluminium alloy can have the advantages that high-intensitive, high-fracture toughness and excellent corrosion protection energy simultaneously.
Mn, Cr, Er are the micro alloying elements of aluminium alloy, and inhibition recrystallization is primarily served in aluminium alloy and crystal grain is grown up
Effect.Although applicant is through a large number of experiments the study found that Mn, Cr, Er element, which have aluminium alloy, inhibits recrystallization
Effect, but individually in addition Mn, Cr, Er when one or two kinds of elements, it cannot all enable aluminum alloy to obtain along the direction of extrusion completely fine
When dimension crystalline substance tissue, only compound tri- kinds of elements of addition Mn, Cr, Er, it is likely to enable aluminum alloy to obtain complete fiber along the direction of extrusion
Crystalline substance tissue.It is 0.2~0.3%, Er content is 0.2~0.3% when Mn content is 0.4~0.6%, Cr content, and the matter of Mn, Cr, Er
When amount is than being 2:1:1, it can be ensured that aluminium alloy obtains complete fibrous crystal tissue along the direction of extrusion.When the content range of Mn, Cr, Er
Not when above range or mass ratio are not 2:1:1, it all cannot ensure that aluminium alloy obtains complete fibrous crystal group along the direction of extrusion
It knits, the duplex grain structure being made of fibrous crystal and recrystal grain can only be obtained.
Ti, B are added in aluminum alloy melt in the form of Al-5Ti-1B alloy wire, 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 alloy wire2Particle, Al-
The additive amount of 5Ti-1B alloy wire 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, adds 0.4~0.6% Al-5Ti-1B alloy wire, contains 0.02~0.03% in aluminium alloy
Ti, 0.004~0.006% B, can control aluminium alloy cast ingot crystallite dimension be 200~300 microns, it is ensured that aluminium alloy casting
Ingot can obtain fibrous crystal tissue after squeezing.
Fe and Si is aluminium ingot, zinc ingot metal, inevitable impurity element in magnesium ingot.Applicant pass through experimental studies have found that, when
When content of the Fe content greater than 0.15%, Si is greater than 0.1%, Fe and Si will form coarse needle-shaped AlFeSi system gold in aluminium alloy
Compound between category, the compound belong to brittle phase, are the formation of crack and direction of crack propagation for usually becoming aluminium alloy and being broken,
The intensity and fracture toughness of meeting severe exacerbation aluminium alloy.Therefore, it is necessary to the contents of strict control Fe and Si.The present invention passes through selection
It is small to control Fe content as raw material for the magnesium ingot that zinc ingot metal that aluminium ingot that purity is 99.7%, purity are 99.9%, purity are 99.9%
In 0.15%, Si content less than 0.1%, in conjunction with subsequent homogenizing cast ingot, pair of Fe, Si impurity element can be eliminated
The influence of intensity of aluminum alloy and fracture toughness.
The preparation method and main technologic parameters of anticorrosive Al-Zn-Mg line aluminium alloy tough to height of the present invention below
Selection meaning and reason be illustrated.
The preparation method of the tough anticorrosive Al-Zn-Mg line aluminium alloy of height of the present invention, its main feature is that including following step
It is rapid:
Step 1: selecting Al-20Cu alloy, Al-20Mn alloy, Al-10Cr alloy, Al-10Er alloy, Al-5Ti-1B
The magnesium ingot that zinc ingot metal that aluminium ingot that alloy wire and purity are 99.7%, purity are 99.9%, purity are 99.9% is as raw material；
Step 2: aluminium ingot is melted in 770~780 DEG C of heating, being then added and accounting for raw material total weight is 5.6~5.9%
Zinc ingot metal, 0.5~0.8% magnesium ingot, 1.5~2.5% Al-20Cu alloy, 2~3% Al-20Mn alloy, 2~3% Al-10Cr
Alloy and 2~3% Al-10Er alloy, stirring be fused into aluminum alloy melt；
Step 3: spray refining is carried out 10~15 minutes to aluminum alloy melt in furnace with carbon trichloride refining agent, it is quiet after skimming
It sets 30~40 minutes；
Step 4: aluminum alloy melt in furnace is imported chute, Al-5Ti-1B of the raw material total weight for 0.4~0.6% will be accounted for
Alloy wire, which is added in aluminum alloy melt, carries out online crystal grain refinement processing；
Rotation speed is set on chute for 150~160 revs/min, argon gas stream step 5: aluminum alloy melt is flowed successively through
The foamed ceramic filter plate that the getter and porosity that amount is 5~6 cubes ms/h are 30~40ppi, carries out online degasification
Filter processing；
Step 6: by aluminum alloy melt in 670~680 DEG C of casting temperature, 110~120 mm/min of casting speed, cooling
Semi-continuous casting is at aluminium alloy cast ingot under the conditions of 1~2MPa of water pressure；
Step 7: aluminium alloy cast ingot is heated to 450~460 DEG C of Homogenization Treatments 3-4 hours, it is further continued for being heated to 550
~560 DEG C Homogenization Treatments 2-3 hours, then water mist pressure be cooled to room temperature；
Step 8: aluminium alloy cast ingot is heated to 520~530 DEG C, 7~8 ms/min of extrusion speed, extrusion ratio 60~
Extrusion molding is carried out under the conditions of 70, is then cooled by water to room temperature；
Step 9: extruding aluminium alloy is heated to 150~160 DEG C of timeliness 9~10 hours, obtained after furnace cooling high tough
Anticorrosive Al-Zn-Mg line aluminium alloy.
Stomata and be mingled be aluminium alloy common deficiency, these defects be also aluminium alloy fracture formation of crack and be corroded
Starting point, therefore, the degree of purity for improving aluminium alloy are to ensure that aluminium alloy obtains the basis of high combination property.The present invention first uses chlordene
Ethane refining agent carries out spray refining degasification removal of impurities to aluminum alloy melt in furnace, and aluminum alloy melt is then flowed successively through setting again and is being flowed
The getter and porosity that rotation speed is 150~160 revs/min on slot, argon flow is 5~6 cubes ms/h be 30~
The foamed ceramic filter plate of 40ppi carries out online degassing and filtration processing, carries out deep purifying to aluminum alloy melt, enables aluminum alloy to liquid
Gas content is lower than 0.11 milliliter/100 grams aluminium, and non-metallic inclusion content PoDFA is lower than 0.0 square millimeter/kilogram, significantly aluminium
The cleanliness of alloy eliminates stomata and is mingled with the influence to Mechanical Properties of Aluminum Alloys and corrosion resistance.
Applicant after experiment further investigation by having found, when the crystallite dimension of aluminium alloy cast ingot is 200~300 microns,
Complete fibrous crystal tissue is obtained most beneficial for Aluminum alloy extrusion material.The present invention uses the online crystal grain refinement of Al-5Ti-1B alloy wire
On the basis of processing, by optimizing the semicontinuous casting technique parameter of aluminium alloy cast ingot, in aluminum alloy melt casting temperature 670~680
DEG C, under the conditions of 110~120 mm/min of casting speed, 1~2MPa of cooling water pressure semi-continuous casting at aluminium alloy cast ingot, aluminium
The crystallite dimension of alloy cast ingot is 200~300 microns, is very beneficial for the aluminium alloy extruded rear complete fibrous crystal tissue of acquisition.Such as
Fruit casting technological parameter can not enable aluminum alloy to the crystal grain that ingot casting obtains 200~300 microns not in above-mentioned matching range, squeeze
Also complete fibrous crystal tissue can not be obtained after pressure.
The purpose of Homogenization Treatments is to eliminate the macro microsegregation of inside ingot alloying element, makes alloying element and coarse gold
Compound sufficiently melts between category.Applicant has found after passing through lot of experiments, and aluminium alloy cast ingot is heated to 450~460 DEG C
It Homogenization Treatments 3-4 hours, is further continued for being heated to 550~560 DEG C of Homogenization Treatments 2-3 hours, then water mist pressure is cooled to
Room temperature can completely eliminate the macro microsegregation of inside ingot Zn, Mg, Cu element, fill element and coarse InterMetallic Compound
Divide and melts solid solution.
Suitable extrusion process is the essential condition for obtaining complete fibrous crystal tissue.Applicant passes through to aluminium of the present invention
Alloy extrusion process research after find, aluminium alloy cast ingot is heated to 520~530 DEG C, 7~8 ms/min of extrusion speed,
Extrusion molding is carried out under the conditions of extrusion ratio 60~70, is then cooled by water to room temperature, and Aluminum alloy extrusion material can in the direction of extrusion
Complete fibrous crystal tissue is obtained, Aluminum alloy extrusion material shows the excellent comprehensive of high intensity, high-fracture toughness and improved corrosion performance
Close performance.If extrusion process parameters not in above-mentioned matching range, can not obtain complete fibrous crystal tissue, can only obtain by
The duplex grain structure that fiber crystal grain and recrystal grain are constituted, and it is also possible that deformation stress in aluminium alloys can be too big, it squeezes
The problems such as pressure is difficult, or aluminium alloy press quenching is insufficient after extruding, can not obtain desired aluminium alloy capability.
Extruding aluminium alloy is heated to by applicant by finding after the aging technique research to aluminium alloy of the present invention
150~160 DEG C timeliness 9~10 hours, then furnace cooling, available optimal intensity, fracture toughness and corrosion resistance.
If aging temp lower than 150 DEG C or aging time less than 9 hours, for sub- timeliness, and aging temp be higher than 160 DEG C or
Aging time is greater than 10 hours, then will appear overaging, desired intensity of aluminum alloy, fracture toughness and corrosion resistance is not achieved
Energy.
Below with reference to specific embodiment and comparative example, further description of the technical solution of the present invention, so as to more preferable
Understanding technical solution of the present invention.
Embodiment 1:
Aluminium alloy is by following mass percent at being grouped as: Zn 5.6%, Mg 0.8%, Cu 0.5%, Mn 0.4%, Cr
0.2%, Er 0.2%, Ti 0.03%, B 0.006%, Fe≤0.15%, Si≤0.1%, surplus be Al and inevitably it is other miscellaneous
Matter, inevitable other single content≤0.05% of impurity, total amount≤0.15%；Preparation method includes the following steps:
Step 1: selecting Al-20Cu alloy, Al-20Mn alloy, Al-10Cr alloy, Al-10Er alloy, Al-5Ti-1B
The magnesium ingot that zinc ingot metal that aluminium ingot that alloy wire and purity are 99.7%, purity are 99.9%, purity are 99.9% is as raw material；
Step 2: aluminium ingot is melted in 770 DEG C of heating, the zinc ingot metal, 0.8% for accounting for that raw material total weight is 5.6% is then added
Magnesium ingot, 2.5% Al-20Cu alloy, 2% Al-20Mn alloy, 2% Al-10Cr alloy and 2% Al-10Er alloy, stir
It mixes and is fused into aluminum alloy melt；
Step 3: carrying out blowing essence to aluminum alloy melt in furnace with the carbon trichloride refining agent that raw material total weight is 0.5% is accounted for
Refining 12 minutes, stands 35 minutes after skimming；
Step 4: aluminum alloy melt in furnace is imported chute, Al-5Ti-1B alloy wire of the raw material total weight for 0.6% will be accounted for
It is added in aluminum alloy melt and carries out online crystal grain refinement processing；
Step 5: by aluminum alloy melt flow successively through be arranged on chute rotation speed be 150 revs/min, argon flow 6
Cube m/h getter and porosity be 30ppi foamed ceramic filter plate, carry out online degassing and filtration processing；
Step 6: by aluminum alloy melt in 670 DEG C of casting temperature, 120 mm/min of casting speed, cooling water pressure 1MPa
Under the conditions of semi-continuous casting at aluminium alloy cast ingot；
Step 7: aluminium alloy cast ingot is heated to 460 DEG C of Homogenization Treatments 3 hours, it is further continued for being heated to 550 DEG C of homogenization
Processing 3 hours, then water mist pressure are cooled to room temperature；
Step 8: aluminium alloy cast ingot is heated to 520 DEG C, carried out under the conditions of 8 ms/min of extrusion speed, extrusion ratio 70
Then extrusion molding is cooled by water to room temperature；
Step 9: extruding aluminium alloy is heated to 160 DEG C of timeliness 9 hours, high tough anticorrosive Al- is obtained after furnace cooling
Zn-Mg line aluminium alloy.
Embodiment 2:
Aluminium alloy is by following mass percent at being grouped as: Zn 5.8%, Mg 0.6%, Cu 0.4%, Mn 0.5%, Cr
0.25%, Er 0.25%, Ti 0.02%, B 0.004%, Fe≤0.15%, Si≤0.1%, surplus be Al and inevitably it is other
Impurity, inevitable other single content≤0.05% of impurity, total amount≤0.15%；Preparation method includes the following steps:
Step 1: selecting Al-20Cu alloy, Al-20Mn alloy, Al-10Cr alloy, Al-10Er alloy, Al-5Ti-1B
The magnesium ingot that zinc ingot metal that aluminium ingot that alloy wire and purity are 99.7%, purity are 99.9%, purity are 99.9% is as raw material；
Step 2: aluminium ingot is melted in 775 DEG C of heating, the zinc ingot metal, 0.6% for accounting for that raw material total weight is 5.8% is then added
Magnesium ingot, 2% Al-20Cu alloy, 2.5% Al-20Mn alloy, 2.5% Al-10Cr alloy and 2.5% Al-10Er close
Gold, stirring are fused into aluminum alloy melt；
Step 3: carrying out blowing essence to aluminum alloy melt in furnace with the carbon trichloride refining agent that raw material total weight is 0.5% is accounted for
Refining 15 minutes, stands 30 minutes after skimming；
Step 4: aluminum alloy melt in furnace is imported chute, Al-5Ti-1B alloy wire of the raw material total weight for 0.4% will be accounted for
It is added in aluminum alloy melt and carries out online crystal grain refinement processing；
Step 5: by aluminum alloy melt flow successively through be arranged on chute rotation speed be 160 revs/min, argon flow 5
Cube m/h getter and porosity be 40ppi foamed ceramic filter plate, carry out online degassing and filtration processing；
Step 6: by aluminum alloy melt in 680 DEG C of casting temperature, 110 mm/min of casting speed, cooling water pressure 2MPa
Under the conditions of semi-continuous casting at aluminium alloy cast ingot；
Step 7: aluminium alloy cast ingot is heated to 455 DEG C of Homogenization Treatments 3.5 hours, it is further continued for being heated to 5505 DEG C
Processing 2.5 hours is homogenized, then water mist pressure is cooled to room temperature；
Step 8: aluminium alloy cast ingot is heated to 525 DEG C, carried out under the conditions of 7 ms/min of extrusion speed, extrusion ratio 65
Then extrusion molding is cooled by water to room temperature；
Step 9: extruding aluminium alloy is heated to 155 DEG C of timeliness 9 hours, high tough anticorrosive Al- is obtained after furnace cooling
Zn-Mg line aluminium alloy.
Embodiment 3:
Aluminium alloy is by following mass percent at being grouped as: Zn 5.9%, Mg 0.5%, Cu 0.3%, Mn 0.6%, Cr
0.3%, Er 0.3%, Ti 0.02%, B 0.004%, Fe≤0.15%, Si≤0.1%, surplus be Al and inevitably it is other miscellaneous
Matter, inevitable other single content≤0.05% of impurity, total amount≤0.15%；Preparation method includes the following steps:
Step 1: selecting Al-20Cu alloy, Al-20Mn alloy, Al-10Cr alloy, Al-10Er alloy, Al-5Ti-1B
The magnesium ingot that zinc ingot metal that aluminium ingot that alloy wire and purity are 99.7%, purity are 99.9%, purity are 99.9% is as raw material；
Step 2: aluminium ingot is melted in 780 DEG C of heating, the zinc ingot metal, 0.5% for accounting for that raw material total weight is 5.9% is then added
Magnesium ingot, 1.5% Al-20Cu alloy, 3% Al-20Mn alloy, 3% Al-10Cr alloy and 3% Al-10Er alloy, stir
It mixes and is fused into aluminum alloy melt；
Step 3: carrying out blowing essence to aluminum alloy melt in furnace with the carbon trichloride refining agent that raw material total weight is 0.5% is accounted for
Refining 10 minutes, stands 40 minutes after skimming；
Step 4: aluminum alloy melt in furnace is imported chute, Al-5Ti-1B alloy wire of the raw material total weight for 0.4% will be accounted for
It is added in aluminum alloy melt and carries out online crystal grain refinement processing；
Step 5: by aluminum alloy melt flow successively through be arranged on chute rotation speed be 150 revs/min, argon flow 6
Cube m/h getter and porosity be 30ppi foamed ceramic filter plate, carry out online degassing and filtration processing；
Step 6: by aluminum alloy melt in 670 DEG C of casting temperature, 120 mm/min of casting speed, cooling water pressure
Semi-continuous casting is at aluminium alloy cast ingot under the conditions of 1.5MPa；
Step 7: aluminium alloy cast ingot is heated to 450 DEG C of Homogenization Treatments 4 hours, it is further continued for being heated to 560 DEG C of homogenization
Processing 3 hours, then water mist pressure are cooled to room temperature；
Step 8: aluminium alloy cast ingot is heated to 530 DEG C, carried out under the conditions of 8 ms/min of extrusion speed, extrusion ratio 70
Then extrusion molding is cooled by water to room temperature；
Step 9: extruding aluminium alloy is heated to 150 DEG C of timeliness 10 hours, obtained after furnace cooling high tough anticorrosive
Al-Zn-Mg line aluminium alloy.
Embodiment 4:
Aluminium alloy is by following mass percent at being grouped as: Zn 5.6%, Mg 0.5%, Cu 0.3%, Mn 0.4%, Cr
0.2%, Er 0.2%, Ti 0.02%, B 0.004%, Fe≤0.15%, Si≤0.1%, surplus be Al and inevitably it is other miscellaneous
Matter, inevitable other single content≤0.05% of impurity, total amount≤0.15%；Preparation method includes the following steps:
Step 1: selecting Al-20Cu alloy, Al-20Mn alloy, Al-10Cr alloy, Al-10Er alloy, Al-5Ti-1B
The magnesium ingot that zinc ingot metal that aluminium ingot that alloy wire and purity are 99.7%, purity are 99.9%, purity are 99.9% is as raw material；
Step 2: aluminium ingot is melted in 780 DEG C of heating, the zinc ingot metal, 0.5% for accounting for that raw material total weight is 5.6% is then added
Magnesium ingot, 1.5% Al-20Cu alloy, 2% Al-20Mn alloy, 2% Al-10Cr alloy and 2% Al-10Er alloy, stir
It mixes and is fused into aluminum alloy melt；
Step 3: carrying out blowing essence to aluminum alloy melt in furnace with the carbon trichloride refining agent that raw material total weight is 0.5% is accounted for
Refining 15 minutes, stands 30 minutes after skimming；
Step 4: aluminum alloy melt in furnace is imported chute, Al-5Ti-1B alloy wire of the raw material total weight for 0.4% will be accounted for
It is added in aluminum alloy melt and carries out online crystal grain refinement processing；
Step 5: by aluminum alloy melt flow successively through be arranged on chute rotation speed be 160 revs/min, argon flow 5
Cube m/h getter and porosity be 35ppi foamed ceramic filter plate, carry out online degassing and filtration processing；
Step 6: by aluminum alloy melt in 670 DEG C of casting temperature, 120 mm/min of casting speed, cooling water pressure
Semi-continuous casting is at aluminium alloy cast ingot under the conditions of 1.5MPa；
Step 7: aluminium alloy cast ingot is heated to 450 DEG C of Homogenization Treatments 4 hours, it is further continued for being heated to 550 DEG C of homogenization
Processing 3 hours, then water mist pressure are cooled to room temperature；
Step 8: aluminium alloy cast ingot is heated to 530 DEG C, under the conditions of 7.5 ms/min of extrusion speed, extrusion ratio 65 into
Row extrusion molding, is then cooled by water to room temperature；
Step 9: extruding aluminium alloy is heated to 160 DEG C of timeliness 9 hours, high tough anticorrosive Al- is obtained after furnace cooling
Zn-Mg line aluminium alloy.
Embodiment 5:
Aluminium alloy is by following mass percent at being grouped as: Zn 5.9%, Mg 0.8%, Cu 0.5%, Mn 0.6%, Cr
0.3%, Er 0.3%, Ti 0.03%, B 0.006%, Fe≤0.15%, Si≤0.1%, surplus be Al and inevitably it is other miscellaneous
Matter, inevitable other single content≤0.05% of impurity, total amount≤0.15%；Preparation method includes the following steps:
Step 1: selecting Al-20Cu alloy, Al-20Mn alloy, Al-10Cr alloy, Al-10Er alloy, Al-5Ti-1B
The magnesium ingot that zinc ingot metal that aluminium ingot that alloy wire and purity are 99.7%, purity are 99.9%, purity are 99.9% is as raw material；
Step 2: aluminium ingot is melted in 775 DEG C of heating, the zinc ingot metal, 0.8% for accounting for that raw material total weight is 5.9% is then added
Magnesium ingot, 2.5% Al-20Cu alloy, 3% Al-20Mn alloy, 3% Al-10Cr alloy and 3% Al-10Er alloy, stir
It mixes and is fused into aluminum alloy melt；
Step 3: carrying out blowing essence to aluminum alloy melt in furnace with the carbon trichloride refining agent that raw material total weight is 0.5% is accounted for
Refining 10 minutes, stands 40 minutes after skimming；
Step 4: aluminum alloy melt in furnace is imported chute, Al-5Ti-1B alloy wire of the raw material total weight for 0.6% will be accounted for
It is added in aluminum alloy melt and carries out online crystal grain refinement processing；
Step 5: aluminum alloy melt is flowed successively through setting, rotation speed is 155 revs/min, argon flow is on chute
5.5 cubes ms/h of getter and porosity is the foamed ceramic filter plate of 35ppi, carries out online degassing and filtration processing；
Step 6: by aluminum alloy melt in 675 DEG C of casting temperature, 115 mm/min of casting speed, cooling water pressure
Semi-continuous casting is at aluminium alloy cast ingot under the conditions of 1.5MPa；
Step 7: aluminium alloy cast ingot is heated to 455 DEG C of Homogenization Treatments 3.5 hours, it is further continued for being heated to 555 DEG C uniformly
Change processing 2.5 hours, then water mist pressure is cooled to room temperature；
Step 8: aluminium alloy cast ingot is heated to 525 DEG C, under the conditions of 7.5 ms/min of extrusion speed, extrusion ratio 65 into
Row extrusion molding, is then cooled by water to room temperature；
Step 9: extruding aluminium alloy is heated to 155 DEG C of timeliness 9.5 hours, obtained after furnace cooling high tough anticorrosive
Al-Zn-Mg line aluminium alloy.
Comparative example 1:
Aluminium alloy is by following mass percent at being grouped as: Zn 5.6%, Mg 0.8%, Cu 0.5%, Mn 0.3%, Cr
0.2%, Er 0.2%, Ti 0.03%, B 0.006%, Fe≤0.15%, Si≤0.1%, surplus be Al and inevitably it is other miscellaneous
Matter, inevitable other single content≤0.05% of impurity, total amount≤0.15%；Preparation method includes the following steps:
Step 1: selecting Al-20Cu alloy, Al-20Mn alloy, Al-10Cr alloy, Al-10Er alloy, Al-5Ti-1B
The magnesium ingot that zinc ingot metal that aluminium ingot that alloy wire and purity are 99.7%, purity are 99.9%, purity are 99.9% is as raw material；
Step 2: aluminium ingot is melted in 770 DEG C of heating, the zinc ingot metal, 0.8% for accounting for that raw material total weight is 5.6% is then added
Magnesium ingot, 2.5% Al-20Cu alloy, 1.5% Al-20Mn alloy, 2% Al-10Cr alloy and 2% Al-10Er alloy,
Stirring is fused into aluminum alloy melt；
Step 3: carrying out blowing essence to aluminum alloy melt in furnace with the carbon trichloride refining agent that raw material total weight is 0.5% is accounted for
Refining 12 minutes, stands 35 minutes after skimming；
Step 4: aluminum alloy melt in furnace is imported chute, Al-5Ti-1B alloy wire of the raw material total weight for 0.6% will be accounted for
It is added in aluminum alloy melt and carries out online crystal grain refinement processing；
Step 5: by aluminum alloy melt flow successively through be arranged on chute rotation speed be 150 revs/min, argon flow 6
Cube m/h getter and porosity be 30ppi foamed ceramic filter plate, carry out online degassing and filtration processing；
Step 6: by aluminum alloy melt in 670 DEG C of casting temperature, 120 mm/min of casting speed, cooling water pressure 1MPa
Under the conditions of semi-continuous casting at aluminium alloy cast ingot；
Step 7: aluminium alloy cast ingot is heated to 460 DEG C of Homogenization Treatments 3 hours, it is further continued for being heated to 550 DEG C of homogenization
Processing 3 hours, then water mist pressure are cooled to room temperature；
Step 8: aluminium alloy cast ingot is heated to 520 DEG C, carried out under the conditions of 8 ms/min of extrusion speed, extrusion ratio 70
Then extrusion molding is cooled by water to room temperature；
Step 9: extruding aluminium alloy is heated to 160 DEG C of timeliness 9 hours, the conjunction of Al-Zn-Mg system aluminium is obtained after furnace cooling
Gold.
Comparative example 2:
Aluminium alloy is by following mass percent at being grouped as: Zn 5.8%, Mg 0.6%, Cu 0.4%, Mn 0.5%, Cr
0.25%, Er 0.25%, Ti 0.02%, B 0.004%, Fe≤0.15%, Si≤0.1%, surplus be Al and inevitably it is other
Impurity, inevitable other single content≤0.05% of impurity, total amount≤0.15%；Preparation method includes the following steps:
Step 1: selecting Al-20Cu alloy, Al-20Mn alloy, Al-10Cr alloy, Al-10Er alloy, Al-5Ti-1B
The magnesium ingot that zinc ingot metal that aluminium ingot that alloy wire and purity are 99.7%, purity are 99.9%, purity are 99.9% is as raw material；
Step 2: aluminium ingot is melted in 775 DEG C of heating, the zinc ingot metal, 0.6% for accounting for that raw material total weight is 5.8% is then added
Magnesium ingot, 2% Al-20Cu alloy, 2.5% Al-20Mn alloy, 2.5% Al-10Cr alloy and 2.5% Al-10Er close
Gold, stirring are fused into aluminum alloy melt；
Step 3: carrying out blowing essence to aluminum alloy melt in furnace with the carbon trichloride refining agent that raw material total weight is 0.5% is accounted for
Refining 15 minutes, stands 30 minutes after skimming；
Step 4: aluminum alloy melt in furnace is imported chute, Al-5Ti-1B alloy wire of the raw material total weight for 0.4% will be accounted for
It is added in aluminum alloy melt and carries out online crystal grain refinement processing；
Step 5: by aluminum alloy melt flow successively through be arranged on chute rotation speed be 160 revs/min, argon flow 5
Cube m/h getter and porosity be 40ppi foamed ceramic filter plate, carry out online degassing and filtration processing；
Step 6: by aluminum alloy melt in 680 DEG C of casting temperature, 110 mm/min of casting speed, cooling water pressure 2MPa
Under the conditions of semi-continuous casting at aluminium alloy cast ingot；
Step 7: aluminium alloy cast ingot is heated to 455 DEG C of Homogenization Treatments 3.5 hours, it is further continued for being heated to 5505 DEG C
Processing 2.5 hours is homogenized, then water mist pressure is cooled to room temperature；
Step 8: aluminium alloy cast ingot is heated to 525 DEG C, carried out under the conditions of 7 ms/min of extrusion speed, extrusion ratio 50
Then extrusion molding is cooled by water to room temperature；
Step 9: extruding aluminium alloy is heated to 155 DEG C of timeliness 9 hours, the conjunction of Al-Zn-Mg system aluminium is obtained after furnace cooling
Gold.
By professional standard YB/T4290-2012 " largest grain size rank measuring method in metallographic detection faces ", implementing
It is sampled on example and the aluminium alloy of comparative example preparation, after sample is ground, polished and corroded, in LEICA-300 type metallographic microscope
Under the microscopic structure in aluminium alloy extruded direction is observed, testing result is as shown in table 1.
By standard GB/T/T16865-2013 " deformation aluminium, magnesium and its alloy fabricated product tension test sample and side
Method ", aluminium alloy prepared by embodiment and comparative example is processed into standard tensile specimen, in HGF-500 type electronic tensile test machine
Upper carry out room temperature tensile, rate of extension are 2 mm/mins, detect the tensile strength and elongation after fracture of aluminium alloy, testing result
As shown in table 1.
By standard GB/T/T4161-2007 " metal material Plane Strain Fracture Toughness KIC test method ", by embodiment
It is processed into standard sample with the aluminium alloy of comparative example preparation, carries out plane strain fracture toughness in GJJH-550 type destructive test
KIC test, detects the fracture toughness of aluminium alloy, testing result is as shown in table 1.
It, will by standard GB/T/T22640-2008 " the ring specimen stress corrosion (cracking) test method of aluminium alloy converted products "
The aluminium alloy of embodiment and comparative example preparation is processed into standard sample, and C ring is carried out on GYG-400 type stress corrosion (cracking) test machine and is answered
Power corrosion test, stress 400MPa detect the anti-stress corrosion performance of aluminium alloy, and testing result is as shown in table 1.
The testing result of 1 embodiment and comparative example Al-Zn-Mg line aluminium alloy of table
| Metallographic microstructure | Tensile strength/MPa | Elongation after fracture/% | Fracture toughness/KIC | Stress corrosion resistant/day | |
| Embodiment 1 | Complete fibrous crystal tissue | 432.1 | 16.4 | 58.3 | 43 |
| Embodiment 2 | Complete fibrous crystal tissue | 412.7 | 16.8 | 59.2 | 47 |
| Embodiment 3 | Complete fibrous crystal tissue | 429.2 | 15.7 | 61.7 | 49 |
| Embodiment 4 | Complete fibrous crystal tissue | 405.9 | 18.8 | 64.5 | 45 |
| Embodiment 5 | Complete fibrous crystal tissue | 442.6 | 14.1 | 55.6 | 41 |
| Comparative example 1 | Fibrous crystal+recrystallized structure | 398.1 | 12.9 | 49.4 | 35 |
| Comparative example 2 | Fibrous crystal+recrystallized structure | 374.5 | 13.1 | 42.3 | 33 |
From table 1, it can be seen that, the Al-Zn-Mg line aluminium alloy of embodiment 1-5 is complete fibrous crystal group in the direction of extrusion
It knits, the tensile strength of aluminium alloy is greater than 400MPa, and elongation after fracture is greater than 14%, and fracture toughness is greater than 55KIC, stress corrosion resistant
Test is greater than 40 days, shows that aluminium alloy prepared by the present invention has the advantages that high-intensitive, high-fracture toughness and improved corrosion performance.
The Al-Zn-Mg line aluminium alloy of comparative example 1, Mn content is less than 0.4%, and the mass ratio of Mn, Cr, Er are not 2:1:1, comparative example 2
Al-Zn-Mg line aluminium alloy, extrusion ratio is lower than 60, causes the Al-Zn-Mg line aluminium alloy of comparative example 1 and comparative example 2 along squeezing
It is not complete fibrous crystal tissue on direction, but the duplex grain structure that fibrous crystal+recrystal grain is constituted, therefore, aluminium closes
The tensile strength of gold is lower than 400MPa, and elongation after fracture is lower than 14%, and fracture toughness is lower than 50KIC, and stress corrosion resistant test is lower than
40 days.
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 preparation method of high tough anticorrosive Al-Zn-Mg line aluminium alloy, it is characterised in that the aluminium alloy is by following quality
Percentage at being grouped as: Zn5.6~5.9%, Mg0.5~0.8%, Cu0.3~0.5%, Mn0.4~0.6%, Cr0.2~
0.3%, Er0.2~0.3%, Ti0.02~0.03%, B0.004~0.006%, Fe≤0.15%, Si≤0.1%, surplus are
Al and inevitable other impurity, wherein the mass ratio of Mn, Cr, Er are 2:1:1, and inevitable other impurity individually contain
Amount≤0.05%, total amount≤0.15%；The preparation method of the aluminium alloy the following steps are included:
Step 1: selecting Al-20Cu alloy, Al-20Mn alloy, Al-10Cr alloy, Al-10Er alloy, Al-5Ti-1B alloy
Silk and purity be 99.7% aluminium ingot, purity be 99.9% zinc ingot metal, purity be 99.9% magnesium ingot as raw material；
Step 2: aluminium ingot is melted in 770~780 DEG C of heating, then it is added and accounts for the zinc that raw material total weight is 5.6~5.9%
Ingot, 0.5~0.8% magnesium ingot, 1.5~2.5% Al-20Cu alloy, 2~3% Al-20Mn alloy, 2~3% Al-
10Cr alloy and 2~3% Al-10Er alloy, stirring be fused into aluminum alloy melt；
Step 3: carrying out spray refining 10~15 minutes to aluminum alloy melt in furnace with carbon trichloride refining agent, 30 are stood after skimming
~40 minutes；
Step 4: aluminum alloy melt in furnace is imported chute, Al-5Ti-1B alloy of the raw material total weight for 0.4~0.6% will be accounted for
Silk, which is added in aluminum alloy melt, carries out online crystal grain refinement processing；
Step 5: aluminum alloy melt is flowed successively through setting, rotation speed is 150~160 revs/min, argon flow is on chute
5~6 cubes ms/h of getter and porosity is the foamed ceramic filter plate of 30~40ppi, is carried out at online degassing and filtration
Reason；
Step 6: by aluminum alloy melt in 670~680 DEG C of casting temperature, 110~120 mm/min of casting speed, cooling water pressure
Semi-continuous casting is at aluminium alloy cast ingot under the conditions of 1~2MPa of power；
Step 7: aluminium alloy cast ingot is heated to 450~460 DEG C of Homogenization Treatments 3-4 hours, it is further continued for being heated to 550~560
DEG C Homogenization Treatments 2-3 hours, then water mist pressure was cooled to room temperature；
Step 8: aluminium alloy cast ingot is heated to 520~530 DEG C, in 7~8 ms/min of extrusion speed, extrusion ratio 60~70
Extrusion molding is carried out under part, is then cooled by water to room temperature；
Step 9: extruding aluminium alloy is heated to 150~160 DEG C of timeliness 9~10 hours, high tough anti-corruption is obtained after furnace cooling
Lose Al-Zn-Mg line aluminium alloy.
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| CN109468502B (en) * | 2018-12-06 | 2020-05-15 | 广东省材料与加工研究所 | Aluminum alloy extruded material with impact resistance and energy absorption characteristics and manufacturing method thereof |
| CN109385563A (en) * | 2018-12-06 | 2019-02-26 | 佛山市三水凤铝铝业有限公司 | A kind of ultra-high strength and toughness anticorodal aluminium alloy and preparation method thereof |
| CN109957688B (en) * | 2019-03-22 | 2021-02-12 | 广西南南铝加工有限公司 | Preparation method of Al-Zn-Mg large-size flat ingot |
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| CN114250392A (en) * | 2021-12-31 | 2022-03-29 | 亚太轻合金(南通)科技有限公司 | High-stress-corrosion-resistance Al-Zn-Mg aluminum alloy and preparation method thereof |
| CN114686735A (en) * | 2022-03-11 | 2022-07-01 | 山东南山铝业股份有限公司 | Wrought aluminum alloy with gradient structure and preparation method thereof |
| CN114990369B (en) * | 2022-07-28 | 2022-11-18 | 鼎镁新材料科技股份有限公司 | Method for preparing aluminum alloy bicycle rim from secondary aluminum |
| CN115807183B (en) * | 2022-12-13 | 2024-03-26 | 广东中色研达新材料科技股份有限公司 | Aluminum alloy with ceramic color sense anodic oxidation effect and processing technology thereof |
| CN115927929A (en) * | 2022-12-14 | 2023-04-07 | 马鞍山市新马精密铝业有限责任公司 | Production method for improving bending performance of Al-Mg-Si series extruded aluminum alloy |
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