CN109385563A - A kind of ultra-high strength and toughness anticorodal aluminium alloy and preparation method thereof - Google Patents

A kind of ultra-high strength and toughness anticorodal aluminium alloy and preparation method thereof Download PDF

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Publication number
CN109385563A
CN109385563A CN201811488484.3A CN201811488484A CN109385563A CN 109385563 A CN109385563 A CN 109385563A CN 201811488484 A CN201811488484 A CN 201811488484A CN 109385563 A CN109385563 A CN 109385563A
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alloy
aluminium alloy
aluminium
toughness
ingot
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胡权
郑若驹
周京辉
王顺成
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Foshan Sanshui Fenglu Aluminium Co Ltd
Guangdong Fenglu Aluminium Co Ltd
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Foshan Sanshui Fenglu Aluminium Co Ltd
Guangdong Fenglu Aluminium Co Ltd
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Priority to CN201811488484.3A priority Critical patent/CN109385563A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • 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
    • C22C1/026—Alloys based on aluminium
    • 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
    • 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
    • C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—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 ultra-high strength and toughness anticorodal aluminium alloy and preparation method thereof, the aluminium alloy is by following mass percent at being grouped as: Zn 5.6%~5.9%, Mg 2.3%~2.6%, Cu 1.4%~1.8%, Cr 0.2%~0.3%, Ni 0.1%~0.2%, Sm 0.05%~0.1%, V 0.05%~0.1%, Ti 0.01%~0.02%, C 0.002%~0.004%, Fe≤0.15%, Si≤0.1%, surplus are Al and inevitable other impurity.Preparation method includes: that aluminum alloy melt, spray refining, online refinement processing, online degassing and filtration, ingot homogenization, heating extruding, press quenching and artificial aging in furnace are prepared in melting.Prepared aluminium alloy has the toughness and stress-corrosion-cracking resistance that intensity is high, plasticity is good and excellent.

Description

A kind of ultra-high strength and toughness anticorodal aluminium alloy and preparation method thereof
Technical field
The present invention relates to aluminium alloy and its preparation technical field, in particular to a kind of ultra-high strength and toughness anticorodal aluminium alloy and its Preparation method.
Background technique
With the light-weighted development of the transport facilitys such as automobile, rail traffic, ship, aircraft, aluminium alloy is transported in traffic Application on defeated tool is growing.Transport facility is mostly big specification, hollow, thin-walled aluminium alloy type with aluminium alloy Material, in order to improve bearing capacity, impact resistance, service safety and the service life of transport facility, to aluminium alloy extrusions Comprehensive performance it is also more demanding, such as higher intensity, toughness, corrosion resistance.
Existing Al-Mg-Si system and Al-Mg-Si-Cu line aluminium alloy, although having preferable extrusion process performance and welding Performance, but for transport facility as stress members when, also generally existing low strength the problem of.Al-Zn-Mg-Cu Line aluminium alloy belongs to heat-treatable strengthened high-strength aluminum alloy.Although the intensity of Al-Zn-Mg-Cu aluminum alloy is higher, The shock resistance fracture toughness and anti-stress corrosion performance of Al-Zn-Mg-Cu aluminum alloy are again universal lower, the reason is that high-alloying Cause there are biggish restricting relation between strength and toughness, highdensity precipitation strength, which is mutually assembled in crystal boundary, to be easy to cause stress Corrosion etc..Therefore, existing Al-Zn-Mg-Cu aluminum alloy and its preparation and pressing method still have much room for improvement and develop.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide one kind to have high intensity, plasticity good And excellent aluminium alloy of toughness and preparation method thereof, it is intended to solve the problems, such as indicated above.
In order to achieve the above object, this invention takes following technical schemes:
A kind of ultra-high strength and toughness anticorodal aluminium alloy, by following mass percent at being grouped as: Zn 5.6%~5.9%, Mg 2.3% ~2.6%, Cu 1.4%~1.8%, Cr 0.2%~0.3%, Ni 0.1%~0.2%, Sm 0.05%~0.1%, V 0.05%~ 0.1%, Ti 0.01%~0.02%, C 0.002%~0.004%, Fe≤0.15%, Si≤0.1%, surplus is for Al and inevitably Other impurity, inevitable other single content≤0.05% of impurity, total amount≤0.15%.
A kind of preparation method of ultra-high strength and toughness anticorodal aluminium alloy, comprising the following steps:
S001. select the aluminium ingot of purity >=99.8%, the zinc ingot metal of purity >=99.9%, purity >=99.95% magnesium ingot and AlCu20 alloy, AlCr10 alloy, Al Ni10 alloy, AlSm5 alloy, AlV5 alloy and AlTi5C1 rod of metal alloy are raw material；
S002. aluminium ingot is put into melting furnace 740~750 DEG C of heating fusings, be then added account for raw material total weight be 5.6%~ 5.9% zinc ingot metal, 2.3%~2.6% magnesium ingot, 7%~9% AlCu20 alloy, 2%~3% AlCr10 alloy, 1%~2% AlNi10 alloy, 1%~2% AlSm5 alloy and 1%~2% AlV5 alloy, stirring are fused into aluminum alloy melt；
S003. use the argon gas for accounting for sodium-free refining agent and purity >=99.9% that raw material total weight is 0.2%~0.5% to aluminium in furnace Aluminium alloy spray refining progress degasification removal of impurities processing in 10~20 minutes, stands 20~30 minutes again after skimming；
S004. aluminum alloy melt in furnace is imported into chute, AlTi5C1 rod of metal alloy of the raw material total weight for 0.2%~0.4% will be accounted for It is added to progress online refinement processing in aluminum alloy melt；
S005., aluminum alloy melt is flowed successively through to the getter being arranged on chute and foamed ceramic filter plate carries out online degasification Filtration treatment；
S006. by aluminum alloy melt semi-continuous casting at aluminium alloy cast ingot；
S007. by aluminium alloy cast ingot Homogenization Treatments, then water mist pressure is cooled to room temperature；
S008. extrusion molding is carried out after aluminium alloy cast ingot being heated, and is then cooled by water to room temperature；
S009. extruding aluminium alloy is heated and carries out ageing treatment, high tough anticorodal aluminium alloy is obtained after furnace cooling.
In the preparation method of the ultra-high strength and toughness anticorodal aluminium alloy, sodium-free refining agent refers to not in the step S003 Refining agent containing sodium salt.
In the preparation method of the ultra-high strength and toughness anticorodal aluminium alloy, the graphite rotator of getter in the step S005 Rotation speed be 200~250 revs/min, argon flow be 3~5 cubes ms/h, the porosity of foamed ceramic filter plate For 30~40ppi.
In the preparation method of the ultra-high strength and toughness anticorodal aluminium alloy, the semicontinuous casting of aluminum alloy melt in the step S006 The casting temperature made is 730~740 DEG C, and casting speed is 50~70 mm/mins, and cooling water pressure is 0.6~0.8MPa.
In the preparation method of the ultra-high strength and toughness anticorodal aluminium alloy, aluminium alloy cast ingot is homogenized in the step S007 Processing is that aluminium alloy cast ingot is first heated to 430~440 DEG C of heat preservations 3-5 hours, and it is small to be heated to 520~530 DEG C of heat preservation 10-12 When, then water mist pressure is cooled to room temperature.
In the preparation method of the ultra-high strength and toughness anticorodal aluminium alloy, in the step S008 after aluminium alloy cast ingot heating Carrying out extrusion molding is that aluminium alloy cast ingot is first heated to 440~450 DEG C, then in 5~6 ms/min of extrusion speed, extrusion ratio 15~25, extrusion molding is carried out under the conditions of 360~370 DEG C of mold temperature, be then cooled by water to room temperature.
In the preparation method of the ultra-high strength and toughness anticorodal aluminium alloy, in the step S009 extruding aluminium alloy heat into Row ageing treatment is that aluminium alloy is heated to 140~150 DEG C to keep the temperature 8~12 hours, and the anti-corruption of ultra-high strength and toughness is obtained after furnace cooling Lose aluminium alloy.
The utility model has the advantages that
The present invention provides a kind of ultra-high strength and toughness anticorodal aluminium alloys and preparation method thereof, compared with prior art, have as follows Advantage:
(1) present invention is by main alloying element Zn, Mg, Cu of optimization design aluminium alloy at being grouped as, it is ensured that aluminium alloy can Obtain high-intensitive, high-ductility and excellent toughness and stress-corrosion-cracking resistance.
(2) present invention forms Al by adding micro Ni element7Cu4Ni and Al9FeNi dispersion strengthening phase improves aluminium alloy Intensity.
(3) present invention carries out fine degenerate to rich Fe phase by adding micro Sm element, makes rich Fe phase from coarse gill shape It is changed into the graininess of fine uniform, eliminates having for coarse elongated flaky Fe-enriched opposite intensity of aluminum alloy, plasticity and corrosion resistance Evil influences, and improves the intensity, impact flexibility and corrosion resistance of aluminium alloy.
(4) present invention is by addition trace V element to the continuous net-shaped MgZn on crystal boundary2It is refined with AlZnMgCu phase Metamorphism treatment makes it be transformed into discrete fine uniform disperse phase, avoid grain boundary fracture caused by continuous net-shaped intergranular phase and Grain boundary corrosion improves the fracture toughness and corrosion resistance of aluminium alloy.
(5) present invention is handled by polynary microalloy, forms the aluminide disperse phase of polynary coherence, and aluminium alloy is inhibited to tie again Brilliant and crystal grain is grown up, and is improved recrystallization temperature, is enabled aluminum alloy to that tiny unidirectional fiber crystalline substance tissue can be obtained in the direction of extrusion, The fracture toughness and corrosion resistance of aluminium alloy are further improved simultaneously.
(6) tensile strength of aluminium alloy of the present invention is greater than 600MPa, and yield strength is greater than 550MPa, and elongation after fracture is greater than 10%, impact flexibility is greater than 30J cm2, stress corrosion resistant test life is greater than 50 days, good and excellent with intensity height, plasticity Toughness and stress-corrosion-cracking resistance.
Detailed description of the invention
Fig. 1 is the process flow chart of the preparation method of the ultra-high strength and toughness anticorodal aluminium alloy provided by the invention.
Specific embodiment
The present invention provides a kind of ultra-high strength and toughness anticorodal aluminium alloy and preparation method thereof, to make the purpose of the present invention, technology Scheme and effect are clearer, clear, and the present invention is described in more detail as follows in conjunction with drawings and embodiments.It should manage Solution, described herein specific examples are only used to explain the present invention, is not intended to limit the present invention.
A kind of ultra-high strength and toughness anticorodal aluminium alloy, by following mass percent at being grouped as: Zn 5.6%~5.9%, Mg 2.3%~2.6%, Cu 1.4%~1.8%, Cr 0.2%~0.3%, Ni 0.1%~0.2%, Sm 0.05%~0.1%, V 0.05%~ 0.1%, Ti 0.01%~0.02%, C 0.002%~0.004%, Fe≤0.15%, Si≤0.1%, surplus is for Al and inevitably Other impurity, inevitable other single content≤0.05% of impurity, total amount≤0.15%.
Wherein, Zn, Mg, Cu are the main alloy elements of aluminium alloy, these elements are strong in addition to having solid solution in aluminium alloy Change effect is outer, and 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. The content of Zn, Mg, Cu are higher, and the intensity of aluminium alloy is also higher, but the plasticity of aluminium alloy, toughness and corrosion resistance also can be gradually Decline.Inventor by being found after the system research to alloying component, when Zn content less than 5.6%, Mg content less than 2.3% or When Cu content is less than 1.4%, 600MPa is not achieved in the intensity of aluminium alloy.When Zn content be greater than 5.9%, Mg content be greater than 2.6% or When Cu content is greater than 1.8%, plasticity, toughness and the corrosion resistance of aluminium alloy all can significantly deteriorate.When Zn content be 5.6%~ 5.9%, Mg content are 2.3%~2.6%, Cu content when being 1.4%~1.8%, can balance the strength and toughness of aluminium alloy, anti-corruption Contradictory relation between corrosion energy, it is ensured that aluminium alloy can obtain excellent comprehensive performance.
Solid solubility of the Cr in aluminium alloy is also larger, and the intensity of aluminium alloy can be improved by solution strengthening.Cr is closed in aluminium In gold also CrAl can be formed with Al6Compound disperses particle, and be distributed on crystal boundary, aluminium alloy can be improved by dispersion-strengtherning Intensity, while inhibition is played to the recrystallization of aluminium alloy, improves the recrystallization temperature of aluminium alloy, be conducive to subsequent extrusion Aluminium alloy obtains tiny unidirectional fiber crystalline substance tissue.In addition, CrAl6Can also dissolved impurity element of Fe, formed FeCrAl6Phase is eliminated The adverse effect of part of impurity elements Fe.But Cr content also should not be too high, otherwise coarse CrAl easy to form6Compound, and Serious segregation is generated, the mechanical property of aluminium alloy can be deteriorated instead, therefore, Cr content is selected as 0.2%~0.3%.
Micro Ni element can form Al in aluminium alloy7Cu4Ni and Al9FeNi dispersion strengthening phase, due to Al7Cu4Ni and Al9FeNi dispersion strengthening phase stability all with higher, the Ni element of addition 0.1%~0.2%, can significantly improve aluminium alloy Hardness.In addition, Al7Cu4Ni and Al9FeNi dispersion strengthening phase Dispersed precipitate, equally can be to crystal boundary, sub boundary on crystal boundary Migration play inhibition and inhibition, thus to aluminium alloy recrystallization play inhibition, tying again for aluminium alloy can be improved Brilliant temperature is conducive to subsequent extrusion aluminium alloy and obtains tiny unidirectional fiber crystalline substance tissue.
Main function of the Sm in aluminium alloy is fine degenerate richness Fe phase.Fe be in aluminium ingot, magnesium ingot and intermediate alloy not Evitable impurity element, usually with coarse gill shape FeAl in aluminium alloy3、FeSiAl3、FeCrAl6It is deposited Deng richness Fe phase form It is in alloy matrix aluminum, these richness Fe phases are hard crisp phase, can seriously isolate alloy matrix aluminum, reduce intensity, the modeling of aluminium alloy Property and fracture toughness.In addition, these richness Fe phases can also form micro- galvanic corrosion with aluminum substrate, the corrosion resistance of aluminium alloy is reduced Energy.Inventor has found that the Sm element of addition 0.05%~0.1% has refinement to coarse elongated flaky Fe-enriched phase by lot of experiments Metamorphism can make rich Fe phase be changed into the graininess of fine uniform from coarse gill shape, and even dispersion is distributed in aluminium alloy Intrinsic silicon can significantly reduce adverse effect of the rich Fe with respect to intensity of aluminum alloy, plasticity, fracture toughness and corrosion resistance.But Sm content is also no more than 0.1%, otherwise coarse SmFeAl easy to form7Equal coarse InterMetallic Compounds, and aluminium conjunction can be deteriorated The mechanical property of gold.Therefore, Sm content is selected as 0.05%~0.1%.
Trace V main function in aluminium alloy is to the continuous net-shaped MgZn on crystal boundary2It is refined with AlZnMgCu phase Metamorphism treatment.Since the alloying level of aluminium alloy is higher, especially Zn content is high, along with the aluminum alloy melt of casting process Nonequilibrium freezing reason will form a large amount of MgZn on crystal boundary2With AlZnMgCu phase, these intergranulars be mutually in it is continuous net-shaped, it is this Continuous net-shaped MgZn2It meets with AlZnMgCu and causes grain boundary corrosion, induce grain boundary fracture, also known as intercrystalline cracking, grain boundary fracture category In brittle fracture, this is also Al-Zn-Mg-Cu system high-alloying aluminium alloy toughness and the universal poor important original of corrosion resistance Cause.Inventor pass through experimental studies have found that, addition 0.05%~0.1% V element, to the continuous net-shaped MgZn on crystal boundary2With AlZnMgCu phase has significant fine degenerate effect, can make continuous net-shaped MgZn2With AlZnMgCu phase transition at discrete thin Small uniform MgZn2With AlZnMgCu phase, it is remarkably improved the fracture toughness and corrosion resistance of aluminium alloy.
Ti, C are added in aluminum alloy melt online in the form of AlTi5C1 rod of metal alloy, and main function is refining aluminum alloy The grain structure of pole improves the structural homogenity of aluminium alloy pole, improves the extrusion process performance of aluminium alloy pole.Addition 0.2%~0.4% AlTi5C1 rod of metal alloy, in aluminium alloy containing 0.01%~0.02% Ti, 0.002%~0.004% C, can will The structure refinement of aluminium alloy pole is the equiax crystal of fine uniform, significantly improves the structural homogenity of aluminium alloy pole, improves aluminium The extrusion process performance of alloy pole.
Fe, Si are aluminium ingot, zinc ingot metal, inevitable impurity element in magnesium ingot and other intermediate alloys, are led in aluminium alloy Often with coarse gill shape FeAl3、FeSiAl3、FeCrAl6It is present in alloy matrix aluminum Deng richness Fe phase form, these richness Fe phases are Hard crisp phase, can seriously isolate alloy matrix aluminum, usually become formation of crack and direction of crack propagation that aluminium alloy is broken, deteriorate Intensity, plasticity and the fracture toughness of aluminium alloy.In addition, these richness Fe phases can also form micro- galvanic corrosion with aluminum substrate, aluminium is reduced The corrosion resistance of alloy, therefore, it is necessary to the contents of Fe, Si in strict control aluminium alloy.The present invention by select purity >= 99.8% aluminium ingot, the zinc ingot metal of purity >=99.9%, purity >=99.95% magnesium ingot as main raw material(s), control Fe content≤ 0.15%, Si content≤0.1% can eliminate Fe, Si impurity in conjunction with the processing of subsequent fine degenerate and pole Homogenization Treatments The adverse effect to Mechanical Properties of Aluminum Alloys and corrosion resistance of element.
A kind of preparation method of ultra-high strength and toughness anticorodal aluminium alloy, comprising the following steps:
S001. select the aluminium ingot of purity >=99.8%, the zinc ingot metal of purity >=99.9%, purity >=99.95% magnesium ingot and AlCu20 alloy, AlCr10 alloy, Al Ni10 alloy, AlSm5 alloy, AlV5 alloy and AlTi5C1 rod of metal alloy are raw material； Aluminium ingot, zinc ingot metal, the purity of magnesium ingot are higher, and the content of Fe, Si are also lower in aluminium alloy, are more conducive to Mechanical Properties of Aluminum Alloys and resist The raising of corrosive nature.But the purity of aluminium ingot, zinc ingot metal, magnesium ingot is higher, and price is also more expensive, can increase considerably aluminium alloy accordingly Production cost.It is preferred, therefore, that suggesting that zinc ingot metal, purity that aluminium ingot, purity that selection purity is 99.8% are 99.9% are 99.95% magnesium ingot is as main raw material(s).
S002. aluminium ingot is put into melting furnace 740~750 DEG C of heating fusings, is then added and accounts for raw material total weight and be 5.6%~5.9% zinc ingot metal, 2.3%~2.6% magnesium ingot, 7%~9% AlCu20 alloy, 2%~3% AlCr10 alloy, 1%~ 2% AlNi10 alloy, 1%~2% AlSm5 alloy and 1%~2% AlV5 alloy, stirring be fused into aluminum alloy melt；
S003. use the argon gas for accounting for sodium-free refining agent and purity >=99.9% that raw material total weight is 0.2%~0.5% to aluminium in furnace Aluminium alloy spray refining progress degasification removal of impurities processing in 10~20 minutes, stands 20~30 minutes again after skimming；
S004. aluminum alloy melt in furnace is imported into chute, AlTi5C1 rod of metal alloy of the raw material total weight for 0.2%~0.4% will be accounted for It is added to progress online refinement processing in aluminum alloy melt；
S005., aluminum alloy melt is flowed successively through to the getter being arranged on chute and foamed ceramic filter plate carries out online degasification Filtration treatment；
S006. by aluminum alloy melt semi-continuous casting at aluminium alloy cast ingot；
S007. by aluminium alloy cast ingot Homogenization Treatments, then water mist pressure is cooled to room temperature；
S008. extrusion molding is carried out after aluminium alloy cast ingot being heated, and is then cooled by water to room temperature；
S009. extruding aluminium alloy is heated and carries out ageing treatment, high tough anticorodal aluminium alloy is obtained after furnace cooling.
Specifically, sodium-free refining agent refers to the refining agent without containing sodium salt in the step S003, as NaCl, NaF, Na2CO3Deng.
Na is not almost dissolved in aluminium alloy, and maximum solid solution degree is less than 0.0025%, and the fusing point of Na is low, and only 97.8 ℃.When the aluminum refining agent using traditional salt containing Na refines aluminum alloy melt, can enable aluminum alloy to remain Na member in liquid Element, in aluminum alloy melt process of setting, Na is adsorbed on aluminium dendrite surface or crystal boundary, uses use in aluminum alloy heat processing kimonos In the process, the Na on crystal boundary forms liquid adsorption layer, enables aluminum alloy to generate brittle cracking, i.e., " sodium is crisp ".When containing in aluminium alloy When Si, Na and Si and Al form NaSiAl compound, exist without the Na that dissociates, will not generate " sodium is crisp ".But when Mg content is higher When, Mg can capture Si, and free Na is precipitated, generates " sodium is crisp ".Since the Si content of aluminium alloy of the present invention is lower, and Mg content It is higher, the intensity and fracture toughness of aluminium alloy are reduced in order to avoid " sodium is crisp ", therefore, it is necessary to use the aluminium alloy for being free of Na salt Refining agent refines aluminum alloy melt.
Preferably, the rotation speed of the graphite rotator of getter is 200~250 revs/min in the step S005, argon gas Flow is 3~5 cubes ms/h, and the porosity of foamed ceramic filter plate is 30~40ppi.
Stomata and be mingled be aluminium alloy common deficiency, these defects be also aluminium alloy fracture formation of crack and be corroded Starting point.It ensures that and obtains high performance aluminium alloy, the present invention carries out spray refining degasification to aluminum alloy melt in furnace first Aluminum alloy melt, is then flowed successively through the getter being arranged on chute by removal of impurities again and foamed ceramic filter plate carries out online degasification Filtration treatment carries out deep purifying to aluminium alloy, and the Gas content enabled aluminum alloy to is lower than 0.1 milliliter/100 grams aluminium, nonmetal inclusion Object content is lower than 0.1 square millimeter/kilogram, it is ensured that aluminium alloy can obtain high-intensitive, high-ductility and excellent fracture toughness And corrosion resistance.
Preferably, the casting temperature of aluminum alloy melt semi-continuous casting is 730~740 DEG C in the step S006, casting speed Degree is 50~70 mm/mins, and cooling water pressure is 0.6~0.8MPa.
Preferably, in the step S007 aluminium alloy cast ingot Homogenization Treatments be aluminium alloy cast ingot is first heated to 430~ 440 DEG C heat preservation 3-5 hours, be heated to 520~530 DEG C of heat preservations 10-12 hours, then water mist pressure be cooled to room temperature.
The purpose of Homogenization Treatments is to eliminate the macro microsegregation of the alloying elements such as Zn, Mg, Cu, Cr inside pole, is made FeAl3、FeSiAl3、FeCrAl6、Al7Cu4Ni and Al9The coarse InterMetallic Compounds such as FeNi sufficiently melt as far as possible.Applicant By being found after lot of experiments, aluminium alloy pole is first heated to 430~440 DEG C of heat preservations 3-5 hours, then continues to heat To 520~530 DEG C heat preservation 10-12 hours, then water mist pressure be cooled to room temperature, could eliminate pole inside Zn, Mg, Cu, Cr The macro microsegregation of equal alloying elements, melts coarse InterMetallic Compound sufficiently, eliminates coarse InterMetallic Compound and deteriorates aluminium The mechanical property and corrosion resistance of alloy.
Preferably, carrying out extrusion molding after aluminium alloy cast ingot heating in the step S008 is first to heat aluminium alloy cast ingot To 440~450 DEG C, then under the conditions of 5~6 ms/min of extrusion speed, extrusion ratio 15~25,360~370 DEG C of mold temperature Extrusion molding is carried out, room temperature is then cooled by water to.
Inventor has found after carrying out system research by the extrusion process to aluminium alloy of the present invention, and aluminium alloy cast ingot is first added Heat is to 440~450 DEG C, then in 360~370 DEG C of 5~6 ms/min of extrusion speed, extrusion ratio 15~25, mold temperature conditions Lower carry out extrusion molding, is then cooled by water to room temperature, can prevent extruding aluminium alloy from recrystallization and crystal grain occurs and grow up, aluminium closes Gold could obtain the unidirectional fiber crystalline substance tissue of fine uniform along the direction of extrusion, and aluminium alloy shows high-intensitive and excellent impact Toughness and corrosion resistance.If extrusion process parameters not can guarantee complete inhibition aluminium alloy not in above-mentioned matching range Recrystallization occurs and crystal grain is grown up, not can guarantee and obtain unidirectional fiber crystalline substance tissue, can only obtain recrystallized structure or by portion The duplex grain structure for dividing fiber crystal grain and partial, re-crystallization crystal grain to constitute, aluminium alloy can not obtain desired mechanical property and resist Corrosive nature.
Preferably, in the step S009 extruding aluminium alloy heating carry out ageing treatment be aluminium alloy is heated to 140~ 150 DEG C keep the temperature 8~12 hours, and ultra-high strength and toughness anticorodal aluminium alloy is obtained after furnace cooling.
Aluminium-alloy pipe is heated to 140 by finding after the aging technique research to aluminium alloy of the present invention by applicant ~150 DEG C keep the temperature 8~12 hours, then furnace cooling, available optimal intensity, plasticity, impact flexibility and corrosion resistance Energy.If aging temp lower than 140 DEG C or aging time less than 8 hours, for sub- timeliness, and aging temp is higher than 150 DEG C Or aging time is greater than 12 hours, then will appear overaging, desired intensity of aluminum alloy, plasticity, impact flexibility is not achieved And corrosion resistance.
Embodiment 1
A kind of ultra-high strength and toughness anticorodal aluminium alloy, by following mass percent at being grouped as: Zn 5.7%, Mg 2.5%, Cu 1.6%, Cr 0.25%, Ni 0.16%, Sm 0.08%, V 0.06%, Ti 0.05%, C 0.003%, Fe≤0.15%, Si≤0.1%, Surplus is Al and inevitable other impurity, inevitable other single content≤0.05% of impurity, total amount≤0.15%；Aluminium Preparation and the pressing method of alloy the following steps are included:
Step 1: select the aluminium ingot of purity >=99.8%, the zinc ingot metal of purity >=99.9%, purity >=99.95% magnesium ingot and AlCu20 alloy, AlCr10 alloy, Al Ni10 alloy, AlSm5 alloy, AlV5 alloy and AlTi5C1 rod of metal alloy are raw material；
Step 2: aluminium ingot is put into 745 DEG C of heating fusings in melting furnace, then it is added and accounts for the zinc that raw material total weight is 5.7% Ingot, 2.5% magnesium ingot, 8% AlCu20 alloy, 2.5% AlCr10 alloy, 1.6% AlNi10 alloy, 1.6% AlSm5 close Gold and 1.2% AlV5 alloy, stir and are fused into aluminum alloy melt；
Step 3: with the argon gas of sodium-free refining agent and purity 99.9% that raw material total weight is 0.4% is accounted for aluminum alloy melt in furnace Spray refining progress degasification removal of impurities processing in 16 minutes, stands 25 minutes again after skimming；
Step 4: aluminum alloy melt in furnace is imported chute, the AlTi5C1 rod of metal alloy that raw material total weight is 0.3% will be accounted for and be added to Online refinement processing is carried out in aluminum alloy melt；
Step 5: aluminum alloy melt is flowed successively through be arranged in graphite rotator on chute rotation speed be 230 revs/min, argon gas The foamed ceramic filter plate that the getter and porosity that flow is 4 cubes ms/h are 35ppi carries out at online degassing and filtration Reason；
Step 6: by aluminum alloy melt casting temperature is 735 DEG C, casting speed is 60 mm/mins, cooling water pressure is Semi-continuous casting is at aluminium alloy cast ingot under conditions of 0.7MPa；
Step 7: aluminium alloy cast ingot is first heated to 435 DEG C keeps the temperature 4 hours, it is further continued for being heated to 525 DEG C of heat preservations progress in 11 hours Homogenization Treatments, then water mist pressure are cooled to room temperature；
Step 8: aluminium alloy cast ingot to be first heated to 445 DEG C, then in 5.5 ms/min of extrusion speed, extrusion ratio 20, mold temperature Extrusion molding is carried out under the conditions of 365 DEG C of degree, is then cooled by water to room temperature；
Step 9: aluminium alloy is heated to 145 DEG C of heat preservations, 10 hours progress ageing treatments, the aluminium is obtained after furnace cooling and is closed Gold.
Embodiment 2
A kind of ultra-high strength and toughness anticorodal aluminium alloy, by following mass percent at being grouped as: Zn 5.6%, Mg 2.6%, Cu 1.4%, Cr 0.3%, Ni 0.1%, Sm 0.1%, V 0.05%, Ti 0.02%, C 0.004%, Fe≤0.15%, Si≤0.1% are remaining Amount is Al and inevitable other impurity, inevitable other single content≤0.05% of impurity, total amount≤0.15%；Aluminium closes Gold preparation and pressing method the following steps are included:
Step 1: select the aluminium ingot of purity >=99.8%, the zinc ingot metal of purity >=99.9%, purity >=99.95% magnesium ingot and AlCu20 alloy, AlCr10 alloy, Al Ni10 alloy, AlSm5 alloy, AlV5 alloy and AlTi5C1 rod of metal alloy are raw material；
Step 2: aluminium ingot is put into 750 DEG C of heating fusings in melting furnace, then it is added and accounts for the zinc that raw material total weight is 5.6% Ingot, 2.6% magnesium ingot, 7% AlCu20 alloy, 3% AlCr10 alloy, 1% AlNi10 alloy, 2% AlSm5 alloy and 1% AlV5 alloy, stirring be fused into aluminum alloy melt；
Step 3: with the argon gas of sodium-free refining agent and purity 99.9% that raw material total weight is 0.2% is accounted for aluminum alloy melt in furnace Spray refining progress degasification removal of impurities processing in 20 minutes, stands 20 minutes again after skimming；
Step 4: aluminum alloy melt in furnace is imported chute, the AlTi5C1 rod of metal alloy that raw material total weight is 0.4% will be accounted for and be added to Online refinement processing is carried out in aluminum alloy melt；
Step 5: aluminum alloy melt is flowed successively through be arranged in graphite rotator on chute rotation speed be 250 revs/min, argon gas The foamed ceramic filter plate that the getter and porosity that flow is 3 cubes ms/h are 30ppi carries out at online degassing and filtration Reason；
Step 6: by aluminum alloy melt casting temperature is 740 DEG C, casting speed is 50 mm/mins, cooling water pressure is Semi-continuous casting is at aluminium alloy cast ingot under conditions of 0.6MPa；
Step 7: aluminium alloy cast ingot is first heated to 440 DEG C keeps the temperature 3 hours, it is further continued for being heated to 520 DEG C of heat preservations progress in 12 hours Homogenization Treatments, then water mist pressure are cooled to room temperature；
Step 8: aluminium alloy cast ingot to be first heated to 450 DEG C, then in 5 ms/min of extrusion speed, extrusion ratio 25, mold temperature Extrusion molding is carried out under the conditions of 360 DEG C, is then cooled by water to room temperature；
Step 9: aluminium alloy is heated to 140 DEG C of heat preservations, 12 hours progress ageing treatments, the aluminium is obtained after furnace cooling and is closed Gold.
Embodiment 3
A kind of ultra-high strength and toughness anticorodal aluminium alloy, by following mass percent at being grouped as: Zn 5.9%, Mg 2.3%, Cu 1.8%, Cr 0.2%, Ni 0.2%, Sm 0.05%, V 0.1%, Ti 0.01%, C 0.002%, Fe≤0.15%, Si≤0.1% are remaining Amount is Al and inevitable other impurity, inevitable other single content≤0.05% of impurity, total amount≤0.15%；Aluminium closes Gold preparation and pressing method the following steps are included:
Step 1: select the aluminium ingot of purity >=99.8%, the zinc ingot metal of purity >=99.9%, purity >=99.95% magnesium ingot and AlCu20 alloy, AlCr10 alloy, Al Ni10 alloy, AlSm5 alloy, AlV5 alloy and AlTi5C1 rod of metal alloy are raw material；
Step 2: aluminium ingot is put into 740 DEG C of heating fusings in melting furnace, then it is added and accounts for the zinc that raw material total weight is 5.9% Ingot, 2.3% magnesium ingot, 9% AlCu20 alloy, 2% AlCr10 alloy, 2% AlNi10 alloy, 1% AlSm5 alloy and 2% AlV5 alloy, stirring be fused into aluminum alloy melt；
Step 3: with the argon gas of sodium-free refining agent and purity 99.9% that raw material total weight is 0.5% is accounted for aluminum alloy melt in furnace Spray refining progress degasification removal of impurities processing in 10 minutes, stands 30 minutes again after skimming；
Step 4: aluminum alloy melt in furnace is imported chute, the AlTi5C1 rod of metal alloy that raw material total weight is 0.2% will be accounted for and be added to Online refinement processing is carried out in aluminum alloy melt；
Step 5: aluminum alloy melt is flowed successively through be arranged in graphite rotator on chute rotation speed be 200 revs/min, argon gas The foamed ceramic filter plate that the getter and porosity that flow is 5 cubes ms/h are 40ppi carries out at online degassing and filtration Reason；
Step 6: by aluminum alloy melt casting temperature is 730 DEG C, casting speed is 70 mm/mins, cooling water pressure is Semi-continuous casting is at aluminium alloy cast ingot under conditions of 0.8MPa；
Step 7: aluminium alloy cast ingot is first heated to 430 DEG C keeps the temperature 5 hours, it is further continued for being heated to 530 DEG C of heat preservations progress in 10 hours Homogenization Treatments, then water mist pressure are cooled to room temperature；
Step 8: aluminium alloy cast ingot to be first heated to 440 DEG C, then in 6 ms/min of extrusion speed, extrusion ratio 15, mold temperature Extrusion molding is carried out under the conditions of 370 DEG C, is then cooled by water to room temperature；
Step 9: aluminium alloy is heated to 150 DEG C of heat preservations, 8 hours progress ageing treatments, the aluminium alloy is obtained after furnace cooling.
Comparative example 1
A kind of aluminium alloy, by following component and mass percentage composition: Zn 5.7%, Mg 2.5%, Cu 1.6%, Cr 0.1%, Ni 0.16%, Sm 0.08%, V 0.06%, Ti 0.05%, C 0.003%, Fe≤0.15%, Si≤0.1%, surplus are Al and can not keep away The other impurity exempted from, inevitable other single content≤0.05% of impurity, total amount≤0.15%；The preparation and extruding of aluminium alloy Method the following steps are included:
Step 1: select the aluminium ingot of purity >=99.8%, the zinc ingot metal of purity >=99.9%, purity >=99.95% magnesium ingot and AlCu20 alloy, AlCr10 alloy, Al Ni10 alloy, AlSm5 alloy, AlV5 alloy and AlTi5C1 rod of metal alloy are raw material；
Step 2: aluminium ingot is put into 745 DEG C of heating fusings in melting furnace, then it is added and accounts for the zinc that raw material total weight is 5.7% Ingot, 2.5% magnesium ingot, 8% AlCu20 alloy, 1% AlCr10 alloy, 1.6% AlNi10 alloy, 1.6% AlSm5 alloy AlV5 alloy with 1.2%, stirs and is fused into aluminum alloy melt；
Step 3: with the argon gas of sodium-free refining agent and purity 99.9% that raw material total weight is 0.4% is accounted for aluminum alloy melt in furnace Spray refining progress degasification removal of impurities processing in 16 minutes, stands 25 minutes again after skimming；
Step 4: aluminum alloy melt in furnace is imported chute, the AlTi5C1 rod of metal alloy that raw material total weight is 0.3% will be accounted for and be added to Online refinement processing is carried out in aluminum alloy melt；
Step 5: aluminum alloy melt is flowed successively through be arranged in graphite rotator on chute rotation speed be 230 revs/min, argon gas The foamed ceramic filter plate that the getter and porosity that flow is 4 cubes ms/h are 35ppi carries out at online degassing and filtration Reason；
Step 6: by aluminum alloy melt casting temperature is 735 DEG C, casting speed is 60 mm/mins, cooling water pressure is Semi-continuous casting is at aluminium alloy cast ingot under conditions of 0.7MPa；
Step 7: aluminium alloy cast ingot is first heated to 435 DEG C keeps the temperature 4 hours, it is further continued for being heated to 525 DEG C of heat preservations progress in 11 hours Homogenization Treatments, then water mist pressure are cooled to room temperature；
Step 8: aluminium alloy cast ingot to be first heated to 445 DEG C, then in 5.5 ms/min of extrusion speed, extrusion ratio 20, mold temperature Extrusion molding is carried out under the conditions of 365 DEG C of degree, is then cooled by water to room temperature；
Step 9: aluminium alloy is heated to 145 DEG C of heat preservations, 10 hours progress ageing treatments, the aluminium is obtained after furnace cooling and is closed Gold.
Comparative example 2
A kind of aluminium alloy, by following component and mass percentage composition: Zn 5.6%, Mg 2.6%, Cu 1.4%, Cr 0.3%, Ni 0.04%, Sm 0.1%, V 0.05%, Ti 0.02%, C 0.004%, Fe≤0.15%, Si≤0.1%, surplus is for Al and unavoidably Other impurity, inevitable other single content≤0.05% of impurity, total amount≤0.15%；The preparation of aluminium alloy and extruding side Method the following steps are included:
Step 1: select the aluminium ingot of purity >=99.8%, the zinc ingot metal of purity >=99.9%, purity >=99.95% magnesium ingot and AlCu20 alloy, AlCr10 alloy, Al Ni10 alloy, AlSm5 alloy, AlV5 alloy and AlTi5C1 rod of metal alloy are raw material；
Step 2: aluminium ingot is put into 750 DEG C of heating fusings in melting furnace, then it is added and accounts for the zinc that raw material total weight is 5.6% Ingot, 2.6% magnesium ingot, 7% AlCu20 alloy, 3% AlCr10 alloy, 0.4% AlNi10 alloy, 2% AlSm5 alloy and 1% AlV5 alloy, stirring are fused into aluminum alloy melt；
Step 3: with the argon gas of sodium-free refining agent and purity 99.9% that raw material total weight is 0.2% is accounted for aluminum alloy melt in furnace Spray refining progress degasification removal of impurities processing in 20 minutes, stands 20 minutes again after skimming；
Step 4: aluminum alloy melt in furnace is imported chute, the AlTi5C1 rod of metal alloy that raw material total weight is 0.4% will be accounted for and be added to Online refinement processing is carried out in aluminum alloy melt；
Step 5: aluminum alloy melt is flowed successively through be arranged in graphite rotator on chute rotation speed be 250 revs/min, argon gas The foamed ceramic filter plate that the getter and porosity that flow is 3 cubes ms/h are 30ppi carries out at online degassing and filtration Reason；
Step 6: by aluminum alloy melt casting temperature is 740 DEG C, casting speed is 50 mm/mins, cooling water pressure is Semi-continuous casting is at aluminium alloy cast ingot under conditions of 0.6MPa；
Step 7: aluminium alloy cast ingot is first heated to 440 DEG C keeps the temperature 3 hours, it is further continued for being heated to 520 DEG C of heat preservations progress in 12 hours Homogenization Treatments, then water mist pressure are cooled to room temperature；
Step 8: aluminium alloy cast ingot to be first heated to 450 DEG C, then in 5 ms/min of extrusion speed, extrusion ratio 25, mold temperature Extrusion molding is carried out under the conditions of 360 DEG C, is then cooled by water to room temperature；
Step 9: aluminium alloy is heated to 140 DEG C of heat preservations, 12 hours progress ageing treatments, the aluminium is obtained after furnace cooling and is closed Gold.
Comparative example 3
A kind of aluminium alloy, by following component and mass percentage composition: Zn 5.9%, Mg 2.3%, Cu 1.8%, Cr 0.2%, Ni 0.2%, V 0.1%, Ti 0.01%, C 0.002%, 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%；The preparation of aluminium alloy and pressing method include with Lower step:
Step 1: select the aluminium ingot of purity >=99.8%, the zinc ingot metal of purity >=99.9%, purity >=99.95% magnesium ingot and AlCu20 alloy, AlCr10 alloy, Al Ni10 alloy, AlV5 alloy and AlTi5C1 rod of metal alloy are raw material；
Step 2: aluminium ingot is put into 740 DEG C of heating fusings in melting furnace, then it is added and accounts for the zinc that raw material total weight is 5.9% Ingot, 2.3% magnesium ingot, 9% AlCu20 alloy, 2% AlCr10 alloy, 2% AlNi10 alloy and 2% AlV5 alloy, stirring It is fused into aluminum alloy melt；
Step 3: with the argon gas of sodium-free refining agent and purity 99.9% that raw material total weight is 0.5% is accounted for aluminum alloy melt in furnace Spray refining progress degasification removal of impurities processing in 10 minutes, stands 30 minutes again after skimming；
Step 4: aluminum alloy melt in furnace is imported chute, the AlTi5C1 rod of metal alloy that raw material total weight is 0.2% will be accounted for and be added to Online refinement processing is carried out in aluminum alloy melt；
Step 5: aluminum alloy melt is flowed successively through be arranged in graphite rotator on chute rotation speed be 200 revs/min, argon gas The foamed ceramic filter plate that the getter and porosity that flow is 5 cubes ms/h are 40ppi carries out at online degassing and filtration Reason；
Step 6: by aluminum alloy melt casting temperature is 730 DEG C, casting speed is 70 mm/mins, cooling water pressure is Semi-continuous casting is at aluminium alloy cast ingot under conditions of 0.8MPa；
Step 7: aluminium alloy cast ingot is first heated to 430 DEG C keeps the temperature 5 hours, it is further continued for being heated to 530 DEG C of heat preservations progress in 10 hours Homogenization Treatments, then water mist pressure are cooled to room temperature；
Step 8: aluminium alloy cast ingot to be first heated to 440 DEG C, then in 6 ms/min of extrusion speed, extrusion ratio 15, mold temperature Extrusion molding is carried out under the conditions of 370 DEG C, is then cooled by water to room temperature；
Step 9: aluminium alloy is heated to 150 DEG C of heat preservations, 8 hours progress ageing treatments, the aluminium alloy is obtained after furnace cooling.
By standard GB/T/T 16865-2013 " deformation aluminium, magnesium and its alloy fabricated product tension test sample and side Method ", it will be sampled on the aluminium alloy of Examples 1 to 3 and comparative example 1~3 respectively and be processed into standard tensile specimen, in PVM-2000 Room temperature tensile is carried out on type electronic tensile test machine, rate of extension is 2 mm/mins, detects tensile strength, the surrender of aluminium alloy Intensity and elongation after fracture, testing result are as shown in table 1.
The tensile mechanical properties of 1~3 aluminium alloy of 1 Examples 1 to 3 of table and comparative example
Tensile strength/MPa Yield strength/MPa Elongation after fracture/%
Embodiment 1 625.8 573.4 12.8
Embodiment 2 637.1 584.5 10.9
Embodiment 3 609.9 558.1 14.1
Comparative example 1 586.1 531.5 8.5
Comparative example 2 591.1 548.2 7.1
Comparative example 3 562.7 524.1 9.9
Charpy-type test is carried out by standard GB/T/T 229-1994 " pendulum impact test method ", respectively by embodiment 1 ~3 and comparative example 1~3 aluminium alloy on sample and be processed into having a size of 55mm × 10mm × 7.5mm V-notch impact specimen Impact test is carried out on CNM-500 digital display Charpy impact machine tester, detects the impact flexibility of aluminium alloy, as a result such as 2 institute of table Show.
By standard GB/T/T 22640-2008 " the ring specimen stress corrosion (cracking) test method of aluminium alloy converted products ", Standard sample will be sampled and is processed on the aluminium alloy of Examples 1 to 3 and comparative example 1~3 respectively, in WRNB-1000 type stress C Zernike annular polynomial corrosion test is carried out on corrosion testing machine, stress 400MPa detects the anti-stress corrosion performance of aluminium alloy, detects The results are shown in Table 2.
The impact flexibility and stress-corrosion-cracking resistance of 1~3 aluminium alloy of 2 Examples 1 to 3 of table and comparative example
Impact flexibility/Jcm2 Stress-corrosion-cracking resistance/day
Embodiment 1 35 55
Embodiment 2 31 51
Embodiment 3 33 53
Comparative example 1 28 45
Comparative example 2 26 41
Comparative example 3 29 43
From Tables 1 and 2, it can be seen that, the tensile strength of the aluminium alloy of 1-3 of the embodiment of the present invention is greater than 600MPa, and yield strength is greater than 550MPa, elongation after fracture are greater than 10%, and impact flexibility is greater than 30J cm2, stress corrosion dehiscence resistant test life be greater than 50 days, The toughness and stress-corrosion-cracking resistance high with intensity, plasticity is good and excellent.The aluminium alloy of comparative example 1 is due to adding The Cr constituent content added is lower than 0.2%, the aluminium alloy of comparative example 2 since the Ni constituent content of addition is lower than 0.1%, comparative example 3 Aluminium alloy adds Sm element due to not having, and causes intensity, plasticity, impact flexibility and the resistance to stress of the aluminium alloy of comparative example 1-3 rotten Erosion cracking performance is below the aluminium alloy of the embodiment of the present invention.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to the guarantor of appended claims of the invention Protect range.

Claims (8)

1. a kind of ultra-high strength and toughness anticorodal aluminium alloy, which is characterized in that by following mass percent at being grouped as: Zn 5.6% ~5.9%, Mg 2.3%~2.6%, Cu 1.4%~1.8%, Cr 0.2%~0.3%, Ni 0.1%~0.2%, Sm 0.05%~ 0.1%, V 0.05%~0.1%, Ti 0.01%~0.02%, C 0.002%~0.004%, Fe≤0.15%, Si≤0.1%, surplus are Al and inevitable other impurity, inevitable other single content≤0.05% of impurity, total amount≤0.15%.
2. a kind of preparation method of ultra-high strength and toughness anticorodal aluminium alloy as described in claim 1, which is characterized in that including following Step:
S001. select the aluminium ingot of purity >=99.8%, the zinc ingot metal of purity >=99.9%, purity >=99.95% magnesium ingot and AlCu20 alloy, AlCr10 alloy, Al Ni10 alloy, AlSm5 alloy, AlV5 alloy and AlTi5C1 rod of metal alloy are raw material；
S002. aluminium ingot is put into melting furnace 740~750 DEG C of heating fusings, be then added account for raw material total weight be 5.6%~ 5.9% zinc ingot metal, 2.3%~2.6% magnesium ingot, 7%~9% AlCu20 alloy, 2~3% AlCr10 alloy, 1%~2% AlNi10 alloy, 1%~2% AlSm5 alloy and 1%~2% AlV5 alloy, stirring are fused into aluminum alloy melt；
S003. use the argon gas for accounting for sodium-free refining agent and purity >=99.9% that raw material total weight is 0.2%~0.5% to aluminium in furnace Aluminium alloy spray refining progress degasification removal of impurities processing in 10~20 minutes, stands 20~30 minutes again after skimming；
S004. aluminum alloy melt in furnace is imported into chute, AlTi5C1 rod of metal alloy of the raw material total weight for 0.2%~0.4% will be accounted for It is added to progress online refinement processing in aluminum alloy melt；
S005., aluminum alloy melt is flowed successively through to the getter being arranged on chute and foamed ceramic filter plate carries out online degasification Filtration treatment；
S006. by aluminum alloy melt semi-continuous casting at aluminium alloy cast ingot；
S007. by aluminium alloy cast ingot Homogenization Treatments, then water mist pressure is cooled to room temperature；
S008. extrusion molding is carried out after aluminium alloy cast ingot being heated, and is then cooled by water to room temperature；
S009. extruding aluminium alloy is heated and carries out ageing treatment, high tough anticorodal aluminium alloy is obtained after furnace cooling.
3. the preparation method of ultra-high strength and toughness anticorodal aluminium alloy according to claim 2, which is characterized in that the step Sodium-free refining agent refers to the refining agent without containing sodium salt in S003.
4. the preparation method of ultra-high strength and toughness anticorodal aluminium alloy according to claim 2, which is characterized in that the step The rotation speed of the graphite rotator of getter is 200~250 revs/min in S005, and argon flow is 3~5 cubes ms/h, The porosity of foamed ceramic filter plate is 30~40ppi.
5. the preparation method of ultra-high strength and toughness anticorodal aluminium alloy according to claim 2, which is characterized in that the step The casting temperature of aluminum alloy melt semi-continuous casting is 730~740 DEG C in S006, and casting speed is 50~70 mm/mins, cooling Water pressure is 0.6~0.8MPa.
6. the preparation method of ultra-high strength and toughness anticorodal aluminium alloy according to claim 2, which is characterized in that the step Aluminium alloy cast ingot Homogenization Treatments are that aluminium alloy cast ingot is first heated to 430~440 DEG C of heat preservations 3-5 hours in S007, are reheated To 520~530 DEG C heat preservation 10-12 hours, then water mist pressure be cooled to room temperature.
7. the preparation method of ultra-high strength and toughness anticorodal aluminium alloy according to claim 2, which is characterized in that the step Carrying out extrusion molding after aluminium alloy cast ingot heating in S008 is that aluminium alloy cast ingot is first heated to 440~450 DEG C, is then being squeezed 5~6 ms/min of speed, extrusion ratio 15~25 carry out extrusion molding under the conditions of 360~370 DEG C of mold temperature, then wear water cooling But to room temperature.
8. the preparation method of ultra-high strength and toughness anticorodal aluminium alloy according to claim 2, which is characterized in that the step It is that aluminium alloy is heated to 140~150 DEG C to keep the temperature 8~12 hours that extruding aluminium alloy heating, which carries out ageing treatment, in S009, with furnace Ultra-high strength and toughness anticorodal aluminium alloy is obtained after cooling.
CN201811488484.3A 2018-12-06 2018-12-06 A kind of ultra-high strength and toughness anticorodal aluminium alloy and preparation method thereof Pending CN109385563A (en)

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