CN110042287A - A kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy and its preparation process - Google Patents

A kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy and its preparation process Download PDF

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CN110042287A
CN110042287A CN201910324475.9A CN201910324475A CN110042287A CN 110042287 A CN110042287 A CN 110042287A CN 201910324475 A CN201910324475 A CN 201910324475A CN 110042287 A CN110042287 A CN 110042287A
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aluminum alloy
ductility
alloy
temperature
aluminium
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黄元春
邹倜
陈斯卓
张传超
马云龙
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Central South University
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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
    • C22C1/026—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
    • 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
    • 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

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Abstract

The present invention relates to technical field of aluminum alloy technology, disclose a kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy, and ingredient includes, by weight percentage, Zn8.4-9.3%, Mg2.3-2.5%'s, Cu1-1.7%, Er1.2-1.6%, Sc0.1-0.2%, Zr0.1-0.2%, Ti0-0.06%, impurity 0-0.1%, surplus Al；The invention also discloses a kind of preparation processes of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy, including ingredient and fusing, composition detection, refining slagging-off, casting, Homogenization Treatments, hot extrusion, solution treatment and ageing treatment step.The present invention combines the performance of the high-strength and high elongation of Al-Zn-Mg-Cu aluminum alloy, improves the tensile strength, yield strength and elongation percentage of Al-Zn-Mg-Cu aluminum alloy, enhances mechanical property and processing performance, make Al3Zr nanometers of phase more disperses are uniformly distributed, and are of great significance in aerospace industries aluminium alloy element field.

Description

A kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy and its preparation process
Technical field
The present invention relates to technical field of aluminum alloy technology, and in particular to a kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy and Its preparation process.
Background technique
The superhard series alloys of Al-Zn-Mg-Cu are heat-treatable strengthened type alloys, with density is small, intensity is high, processing The advantages that performance is good, corrosion resistance and fatigue behaviour are good, is widely used in the industries such as aerospace, is main aerospace One of material, in particular with the high speed development of National Airspace delivery and national defense construction field, to the performance requirement of structural material It is continuously improved.Relative to traditional 2xxx aluminium alloy and Al-Li alloy, possessed by existing Al-Zn-Mg-Cu aluminum alloy The features such as high-intensitive, low-density and good corrosion resistance, is able to satisfy requirement of many large equipments to material property, makes Al- Zn-Mg-Cu line aluminium alloy has a wide range of applications in aerospace field.
Currently, the method that the design of aircraft aluminum generallys use uniform design, the i.e. surface layer of alloy are consistent with core tissue. However, being limited by the contradiction between alloy strength and fracture toughness, close Al-Zn-Mg-Cu system aluminium using the method for uniform design The optimizing components space of gold becomes very little, so the field needs the new method of a kind of design of material and research and development, with further excellent Change the ingredient of Al-Zn-Mg-Cu aluminum alloy.And the main means for further increasing Al-Zn-Mg-Cu aluminum alloy intensity are to increase The content of zincification, magnesium main alloying element, and addition microalloy element appropriate promote matrix precipitate density, but improve simply Zinc, content of magnesium will lead to resistance to corrosion and the fracture toughness decline of alloy, to reduce the reliability of material；In addition, due to High strength characteristics possessed by Al-Zn-Mg-Cu aluminum alloy cause its processing performance poor, and forming cost is higher, weakens it Application range.
Summary of the invention
Based on problem above, the present invention provides a kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy and its preparation process, To obtain the Al-Zn-Mg-Cu aluminum alloy for having superhigh intensity, high tenacity, deep drawing quality energy, processing performance good.
In order to solve the above technical problems, the present invention provides a kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy, at Divide and includes, by weight percentage, Zn8.4-9.3%, Mg2.3-2.5%'s, Cu1-1.7%, Er 1.2-1.6%, Sc0.1- 0.2%, Zr 0.1-0.2%, Ti0-0.06%, impurity 0-0.1%, surplus Al.
Further, by weight percentage, Zn8.5-9.2%, Mg2.3-2.45%, Cu1.2-1.6%, Er 1.3- 1.5%, Sc0.1-0.15%, Zr 0.1-0.2%, Ti0.01-0.05%, impurity 0-0.1%, surplus Al.
Further, by weight percentage, Zn8.6-9.0%, Mg2.3-2.4%, Cu1.40-1.55%, Er 1.3- 1.4%, Sc0.1-0.12%, Zr 0.14-0.18%, Ti0.02-0.04%, impurity 0-0.06%, surplus Al.
In order to solve the above technical problems, the present invention also provides a kind of above-mentioned superpower high-ductility Al-Zn-Mg-Cu system's aluminium conjunctions The preparation process of gold, includes the following steps:
(1) with rafifinal, industrial-purity zinc, pure magnesium, aluminum bronze intermediate alloy, scandium bearing master alloy, aluminium erbium intermediate alloy, Aluminium zirconium hardener, titanium agent are raw material, wherein purity >=99.95wt% of rafifinal, the purity of industrial-purity zinc >= 99.95wt%, purity >=99.99wt% of pure magnesium, content accounting >=50wt% of copper in aluminum bronze intermediate alloy, in aluminium scandium Between scandium content accounting >=2wt% in alloy, erbium content accounting >=10wt% in aluminium erbium intermediate alloy, zirconium in aluminium zirconium hardener Content accounting >=5wt%, Ti content accounting >=75wt% in titanium agent；
Each raw material is converted and weighed according to the ratio, is mixed, heating in high temperature furnace is placed in, and fusing obtains melt；
(2) after mixing evenly by the melt in step (1), it samples, is detected using spectrometer, it is inclined according to actual constituent Difference carries out feed supplement；
(3) refining slagging-off；
(4) it casts, obtains ingot casting；Period, the control of casting operation temperature control during 700-720 DEG C, casting operation Hydrogen content is no more than 0.12ml/100g in melt；
(5) Homogenization Treatments are carried out to the ingot casting obtained in step (4): are first warming up to 385-420 DEG C, keep the temperature 10-14h, It is warming up to 460-500 DEG C again, after keeping the temperature 20-26h, cools to 270-320 DEG C with the furnace, comes out of the stove and be air-cooled to room temperature；
(6) solution treatment is carried out to the ingot casting after Homogenization Treatments；Period is first warming up to 440-500 DEG C, keeps the temperature 1.4- 4.5h, then in room temperature quenching-in water；
(7) under the conditions of the ingot casting after solution treatment being placed in 110-140 DEG C, ageing treatment 20-28h, obtain aluminium alloy at Product.
Further, the refining slagging-off process in step (3) is as follows: injection refining first successively carried out, stands, skim, then Carry out villaumite refining, stand, skim, be then at least repeated once villaumite refine, stand, process of skimming, it is finally logical into melt Enter argon gas stirring.
Further, the melt temperature in step (3) is 735-745 DEG C.
It further, further include the process that hot extrusion is carried out to ingot casting between step (5) and step (6), when hot extrusion Controlled at 430-445 DEG C, control extrusion ratio is 23-26.
Further, when carrying out Homogenization Treatments to ingot casting in step (5), 420 DEG C are first warming up to, keeps the temperature 10h, then rise To 465 DEG C, heat preservation for 24 hours, then cools to 310 DEG C with the furnace, comes out of the stove and be air-cooled to room temperature temperature.
Further, when carrying out solution treatment to ingot casting in step (6), 460 DEG C are first warming up to, keeps the temperature 2.5h, then In room temperature quenching-in water.
Further, in step (7), under the conditions of ingot casting is placed in 110 DEG C, ageing treatment for 24 hours, obtains aluminium alloy finished product.
Compared with prior art, the beneficial effects of the present invention are:
(1) for the present invention compared with existing Al-Zn-Mg-Cu aluminum alloy, the content by reducing Cu increases Al-Zn-Mg- The processing performance of Cu line aluminium alloy, at the same time, the appropriate content that Zn and Mg is turned up, thus main in alloy matrix aluminum by improving Hardening constituent (MgZn2) content come make up Cu content reduce reduction intensity contribution；
(2) Mn the and Cr element in existing Al-Zn-Mg-Cu aluminum alloy is eliminated, and it is brilliant that a small amount of Zr and Ti refinement is added Grain, to reduce alloying level；Thinning effect and hardness are enhanced by joint addition Ti, Zr, Sc element simultaneously, and improve as cast condition Tissue, improves the mechanical property of Al-Zn-Mg-Cu aluminum alloy, and the addition of Sc significantly improves the alloy after being squeezed and deformed Tensile strength and yield strength；
(3) addition of Er makes the mechanical property of Al-Zn-Mg-Cu aluminum alloy obtain significant enhancing；
(4) it is all made of high-purity raw simultaneously to be cast, the content of impurity is reduced to the greatest extent, to improve The elongation percentage of Al-Zn-Mg-Cu aluminum alloy；
(5) due to being added to Zr in Al-Zn-Mg-Cu aluminum alloy, and the Zr in aluminum substrate is partly dissolved at 420 DEG C The secondary Al for generating Dispersed precipitate is easily precipitated in left and right3Zr nanometers of phases allow Al to reach3Zr nanometers of phase more disperses are uniformly distributed, The present invention added the homogenizing process for being first warming up to 385-420 DEG C and keeping the temperature 10-14h before traditional Homogenization Treatment, thus Form final Homogenization Treatments system；
(6) existing Al-Zn-Mg-Cu aluminum alloy product is difficult to combine the performance of high-strength and high elongation, especially When tensile strength reaches 645MPa or more, and the tensile strength of Al-Zn-Mg-Cu aluminum alloy prepared by the present invention can reach 645-700MPa, while elongation percentage can reach 12-15%, and processing performance is good, highest extrusion speed can reach 0.4mm/s, Aerospace industries aluminium alloy element field is of great significance.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment, the present invention is made Further to be described in detail, exemplary embodiment of the invention and its explanation for explaining only the invention, are not intended as to this The restriction of invention.
Embodiment 1:
The present embodiment provides a kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy and its preparation process, in the present embodiment The ingredient of superpower high-ductility high-elongation Al-Zn-Mg-Cu aluminum alloy include: Zn8.4-9.3% by weight percentage, Mg2.3-2.5%'s, Cu1-1.7%, Er 1.2-1.6%, Sc0.1-0.2%, Zr 0.1-0.2%, Ti0-0.06%, impurity 0-0.1%, surplus Al.
The preparation flow of above-mentioned superpower high-ductility high-elongation Al-Zn-Mg-Cu aluminum alloy are as follows: ingredient and fusing → ingredient Detection → refining slagging-off → casting → Homogenization Treatments → hot extrusion → solution treatment → ageing treatment, the specific steps are as follows:
(1) ingredient: among rafifinal, industrial-purity zinc, pure magnesium, aluminum bronze intermediate alloy, scandium bearing master alloy, aluminium erbium Alloy, aluminium zirconium hardener, titanium agent are raw material, wherein purity >=99.95wt% of rafifinal, the purity of industrial-purity zinc >= 99.95wt%, purity >=99.99wt% of pure magnesium, content accounting >=50wt% of copper in aluminum bronze intermediate alloy, in aluminium scandium Between scandium content accounting >=2wt% in alloy, erbium content accounting >=10wt% in aluminium erbium intermediate alloy, zirconium in aluminium zirconium hardener Content accounting >=5wt%, Ti content accounting >=75wt% in titanium agent；Above-mentioned raw materials are converted and weighed according to the ratio, are mixed, are placed in height Heating in warm furnace, fusing obtain melt；
(2) composition detection: in furnace after mixing evenly by the melt in step (1), stokehold samples iron mould casting, uses light Spectrometer is detected, and carries out feed supplement according to actual constituent deviation；
(3) refining slagging-off: concrete operation step are as follows: lead to for the first time argon gas injection refining → standing → skim → → second Logical argon gas sprays CCl4Refining → stand → skim → third time lead to argon gas spray CCl4Refining → standing → skim → lead to argon gas stirring； Logical argon gas spray CCl is at least repeated once in above-mentioned steps4It refines, stand, process of skimming, the melt temperature in this step is 735- 745℃；
(4) cast: the control of casting operation temperature passes through SLE hydrogen meter measurement hydrogen during 700-720 DEG C, casting operation Content is no more than 0.12ml/100g to control hydrogen content in melt；
(5) Homogenization Treatments: carrying out Homogenization Treatments to the ingot casting obtained in step (4), be first warming up to 385-420 DEG C, 10-14h is kept the temperature, then is warming up to 460-500 DEG C, after keeping the temperature 20-26h, 270-320 DEG C is cooled to the furnace, comes out of the stove and be air-cooled to room temperature；
(6) hot extrusion: controlled at 430-445 DEG C when hot extrusion, control extrusion ratio is 23-26.
(7) solution treatment: being first warming up to 440-500 DEG C, 1.4-4.5h is kept the temperature, then in room temperature quenching-in water；
(8) ageing treatment: under the conditions of the ingot casting after solution treatment is placed in 110-140 DEG C, ageing treatment 20-28h is obtained Aluminium alloy finished product.
For the present invention compared with existing Al-Zn-Mg-Cu aluminum alloy, the content by reducing Cu increases Al-Zn-Mg-Cu system The processing performance of aluminium alloy, at the same time, the appropriate content that Zn and Mg is turned up, thus by improving main reinforcing in alloy matrix aluminum Phase (MgZn2) content come make up Cu content reduce reduction intensity contribution；In addition, eliminating existing Al-Zn-Mg-Cu Mn and Cr element in line aluminium alloy, and a small amount of Zr and Ti refinement crystal grain is added, to reduce alloying level；Pass through joint simultaneously Ti, Zr, Sc element enhancing thinning effect and hardness are added, and improves as-cast structure, improves the power of Al-Zn-Mg-Cu aluminum alloy Performance is learned, the addition of Sc significantly improves the tensile strength and yield strength of the alloy after being squeezed and deformed；The addition of Er makes Al- The mechanical property of Zn-Mg-Cu line aluminium alloy has obtained significant enhancing；High-purity raw is all made of simultaneously to be cast, it is maximum Degree reduces the content of impurity, to improve the elongation percentage of Al-Zn-Mg-Cu aluminum alloy.
In addition, due to being added to Zr in Al-Zn-Mg-Cu aluminum alloy, and the Zr in aluminum substrate is partly dissolved in 420 DEG C or so easily be precipitated generate Dispersed precipitate secondary Al3Zr nanometers of phases.Al is allowed in order to reach3Zr nanometers of phase more disperses uniformly divide Cloth, the present invention added the homogenizing process for being first warming up to 385-420 DEG C and keeping the temperature 10-14h before traditional Homogenization Treatment, from And form final Homogenization Treatments system.
Existing Al-Zn-Mg-Cu aluminum alloy product is difficult to combine the performance of high-strength and high elongation, especially anti- When tensile strength reaches 645MPa or more, and the tensile strength of Al-Zn-Mg-Cu aluminum alloy prepared by the present invention can reach 645- 700MPa, while elongation percentage can reach 12-15%, and processing performance is good, highest extrusion speed can reach 0.4mm/s, in aviation Space Industry aluminium alloy element field is of great significance.
Embodiment 2:
The present embodiment provides a kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy and its preparation process, in the present embodiment The ingredient of superpower high-ductility high-elongation Al-Zn-Mg-Cu aluminum alloy include: Zn8.5-9.2% by weight percentage, Mg2.3-2.45%, Cu1.2-1.6%, Er 1.3-1.5%, Sc0.1-0.15%, Zr 0.1-0.2%, Ti0.01- 0.05%, impurity 0-0.1%, surplus Al；The specific weight percent of said components in the present embodiment are as follows: Zn8.5%, Mg2.31%, Cu1.5%, Er1.3%, Sc0.12%, Zr0.11%, Ti0.03%, remaining is Al and each content less than 0.1% Impurity.
The preparation flow of above-mentioned superpower high-ductility high-elongation Al-Zn-Mg-Cu aluminum alloy are as follows: ingredient and fusing → ingredient Detection → refining slagging-off → casting → Homogenization Treatments → hot extrusion → solution treatment → ageing treatment, the specific steps are as follows:
(1) ingredient: among rafifinal, industrial-purity zinc, pure magnesium, aluminum bronze intermediate alloy, scandium bearing master alloy, aluminium erbium Alloy, aluminium zirconium hardener, titanium agent are raw material, wherein the purity of rafifinal is 99.95wt%, and the purity of industrial-purity zinc is 99.95wt%, the purity of pure magnesium are 99.99wt%, and the content accounting of copper is 50wt% in aluminum bronze intermediate alloy, in aluminium scandium Between in alloy scandium content accounting be 2wt%, erbium content accounting is 10wt% in aluminium erbium intermediate alloy, zirconium in aluminium zirconium hardener Content accounting is 5wt%, and Ti content accounting is 75wt% in titanium agent；Above-mentioned raw materials are converted and weighed according to the ratio, are mixed, are placed in height Heating in warm furnace, fusing obtain melt；
(2) composition detection: in furnace after mixing evenly by the melt in step (1), stokehold samples iron mould casting, uses light Spectrometer is detected, and carries out feed supplement according to actual constituent deviation；
(3) refining slagging-off: concrete operation step are as follows: lead to for the first time argon gas injection refining → standing → skim → → second Logical argon gas sprays CCl4Refining → stand → skim → third time lead to argon gas spray CCl4Refining → standing → skim → lead to argon gas stirring； Logical argon gas spray CCl is at least repeated once in above-mentioned steps4It refines, stand, process of skimming, the melt temperature in this step is 740 ℃；
(4) cast: casting operation temperature is 710 DEG C, passes through SLE hydrogen meter measurement hydrogen content during casting operation, with Control melt hydrogen content is 0.091ml/100g；
(5) Homogenization Treatments: being to slowly warm up to 420 DEG C, keeps the temperature 10 hours, then be warming up to 465 DEG C, keeps the temperature 24 hours, with Ingot casting cools to 310 DEG C with the furnace afterwards, comes out of the stove and is air-cooled to room temperature；
(6) hot extrusion: controlled at 440 DEG C when hot extrusion, control extrusion ratio is 23.37；
(7) solution treatment: it is first warming up to 465 DEG C when solution treatment and keeps the temperature 3 hours, then in room temperature quenching-in water；
(8) ageing treatment: the ingot casting after solution treatment is placed under the conditions of 120 DEG C and is handled for 24 hours, aluminium alloy finished product is obtained.
Embodiment 3:
The present embodiment provides a kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy and its preparation process, in the present embodiment The ingredient of superpower high-ductility high-elongation Al-Zn-Mg-Cu aluminum alloy include: Zn8.6-9.0% by weight percentage, Mg2.3-2.4%, Cu1.40-1.55%, Er 1.3-1.4%, Sc0.1-0.12%, Zr 0.14-0.18%, Ti0.02- 0.04%, impurity 0-0.06%, surplus Al；The specific weight percent of said components in the present embodiment are as follows: Zn8.7%, Mg2.36%, Cu1.5%, Er1.4%, Sc0.12%, Zr0.15%, Ti0.04%, remaining is Al and each content less than 0.1% Impurity.
The preparation flow of above-mentioned superpower high-ductility high-elongation Al-Zn-Mg-Cu aluminum alloy are as follows: ingredient and fusing → ingredient Detection → refining slagging-off → casting → Homogenization Treatments → hot extrusion → solution treatment → ageing treatment, the specific steps are as follows:
(1) ingredient: among rafifinal, industrial-purity zinc, pure magnesium, aluminum bronze intermediate alloy, scandium bearing master alloy, aluminium erbium Alloy, aluminium zirconium hardener, titanium agent are raw material, wherein the purity of rafifinal is 99.95wt%, and the purity of industrial-purity zinc is 99.95wt%, the purity of pure magnesium are 99.99wt%, and the content accounting of copper is 50wt% in aluminum bronze intermediate alloy, in aluminium scandium Between in alloy scandium content accounting be 2wt%, erbium content accounting is 10wt% in aluminium erbium intermediate alloy, zirconium in aluminium zirconium hardener Content accounting is 5wt%, and Ti content accounting is 75wt% in titanium agent；Above-mentioned raw materials are converted and weighed according to the ratio, are mixed, are placed in height Heating in warm furnace, fusing obtain melt；
(2) composition detection: in furnace after mixing evenly by the melt in step (1), stokehold samples iron mould casting, uses light Spectrometer is detected, and carries out feed supplement according to actual constituent deviation；
(3) refining slagging-off: concrete operation step are as follows: lead to for the first time argon gas injection refining → standing → skim → → second Logical argon gas sprays CCl4Refining → stand → skim → third time lead to argon gas spray CCl4Refining → standing → skim → lead to argon gas stirring； At least be repeated once in above-mentioned steps logical argon gas spray CCl4 refine, stand, process of skimming, the melt temperature in this step is 745 ℃；
(4) cast: the control of casting operation temperature passes through SLE hydrogen meter measurement hydrogen during 700 DEG C, casting operation and contains Amount, to control in melt hydrogen content as 0.097ml/100g；,
(5) Homogenization Treatments: being slowly warming up to 400 DEG C, keeps the temperature 12 hours, then be warming up to 465 DEG C, and heat preservation 24 is small When, subsequent ingot casting cools to 300 DEG C with the furnace, comes out of the stove and is air-cooled to room temperature；
(6) hot extrusion: controlled at 445 DEG C when hot extrusion, control extrusion ratio is 23.38；
(7) solution treatment: it is first warming up to 478 DEG C when solution treatment and keeps the temperature 2.5 hours, then in room temperature quenching-in water；
(8) ageing treatment: the ingot casting after solution treatment being placed under the conditions of 132 DEG C and handles 23h, obtains aluminium alloy finished product.
Comparative example:
In this comparative example, each element content composition of aluminium alloy is respectively as follows: Zn8.2% by weight percentage, Mg2.2%, Cu2%, Er 1.4%, Sc0.15%, Zr0.15%, Ti0.05%, remaining is Al and each content less than 0.1% Impurity.
The preparation process flow of aluminium alloy in this comparative example are as follows: ingredient and fusing → composition detection → refining slagging-off → casting Make → Homogenization Treatments → hot extrusion → solution treatment → ageing treatment, the specific steps are as follows:
(1) ingredient: among rafifinal, industrial-purity zinc, pure magnesium, aluminum bronze intermediate alloy, scandium bearing master alloy, aluminium erbium Alloy, aluminium zirconium hardener, titanium agent are raw material, wherein the purity of rafifinal is 99.95wt%, and the purity of industrial-purity zinc is 99.95wt%, the purity of pure magnesium are 99.99wt%, and the content accounting of copper is 50wt% in aluminum bronze intermediate alloy, in aluminium scandium Between in alloy scandium content accounting be 2wt%, erbium content accounting is 10wt% in aluminium erbium intermediate alloy, zirconium in aluminium zirconium hardener Content accounting is 5wt%, and Ti content accounting is 75wt% in titanium agent；Above-mentioned raw materials are converted and weighed according to the ratio, are mixed, are placed in height Heating in warm furnace, fusing obtain melt；
(2) composition detection: in furnace after mixing evenly by the melt in step (1), stokehold samples iron mould casting, uses light Spectrometer is detected, and carries out feed supplement according to actual constituent deviation；
(3) refining slagging-off: concrete operation step are as follows: lead to for the first time argon gas injection refining → standing → skim → → second Logical argon gas sprays CCl4Refining → stand → skim → third time lead to argon gas spray CCl4Refining → standing → skim → lead to argon gas stirring； Melt temperature in this step is 735 DEG C；
(4) cast: the control of casting operation temperature passes through SLE hydrogen meter measurement hydrogen during 700 DEG C, casting operation and contains Amount, to control melt hydrogen content as 0.095ml/100g；
(5) Homogenization Treatments: carrying out Homogenization Treatments to the ingot casting obtained in step (4), is first warming up to 400 DEG C, heat preservation 12h, then 465 DEG C are warming up to, after heat preservation for 24 hours, cools to 300 DEG C with the furnace, come out of the stove and be air-cooled to room temperature；
(6) hot extrusion: controlled at 440 DEG C when hot extrusion, control extrusion ratio is 23.38.
(7) solution treatment: being first warming up to 465 DEG C, 3h is kept the temperature, then in room temperature quenching-in water；
(8) ageing treatment: under the conditions of the ingot casting after solution treatment is placed in 120 DEG C, ageing treatment for 24 hours, obtains aluminium alloy Finished product.
It obtains to the aluminium alloy finished product obtained in embodiment 2, the aluminium alloy finished product obtained in embodiment 3 and in comparative example Aluminium alloy finished product is detected as follows: specimen size uses linear cutter according to GB/T16865-2013, and tension test exists It is carried out on DDL100 electronic tensile machine, rate of extension 2mm/min, takes 5 Duplicate Samples under every kind of system, as a result take it average Value.
Above-mentioned testing result is as shown in table 1.
The testing result of the aluminium alloy obtained in 1 embodiment 2 of table, embodiment 3 and comparative example
Above-described embodiment 2 is compared with embodiment 3, and the tensile strength and yield strength of the aluminium alloy finished product in embodiment 2 are equal Less than the tensile strength and yield strength of aluminium alloy finished product in embodiment 3, and the elongation percentage of the aluminium alloy finished product in embodiment 2 is big The elongation percentage of aluminium alloy finished product in embodiment 3, this is because in embodiment 3 Zn and Mg content be higher than embodiment 2 in Zn and The content of Mg, so the intensity of Al-Zn-Mg-Cu aluminum alloy is improved in contrast, and elongation percentage relative reduction；On It states embodiment 2 and it is substantially suitable to reach intensity, but prolong in the case where only passing through the optimization of aluminium alloy principal component compared to comparative example It stretches rate and obtains 2% promotion, while improving the extrusion process rate of alloy, so that the use cost and application prospect of the alloy More there is competitiveness.
It as above is the embodiment of the present invention.Design parameter in above-described embodiment and embodiment is merely to understand table Invention verification process is stated, the scope of patent protection being not intended to limit the invention, scope of patent protection of the invention is still with it It is all to change with equivalent structure made by description of the invention subject to claims, it similarly should be included in this In the protection scope of invention.

Claims (10)

1. a kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy, which is characterized in that its ingredient includes, by weight percentage, Zn8.4-9.3%, Mg2.3-2.5%'s, Cu 1-1.7%, Er 1.2-1.6%, Sc0.1-0.2%, Zr 0.1-0.2%, Ti0-0.06%, impurity 0-0.1%, surplus Al.
2. a kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy according to claim 1, which is characterized in that by weight Percentages, Zn8.5-9.2%, Mg2.3-2.45%, Cu 1.2-1.6%, Er 1.3-1.5%, Sc0.1-0.15%, Zr 0.1-0.2%, Ti 0.01-0.05%, impurity 0-0.1%, surplus Al.
3. a kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy according to claim 1, which is characterized in that by weight Percentages, Zn8.6-9.0%, Mg2.3-2.4%, Cu 1.40-1.55%, Er 1.3-1.4%, Sc0.1-0.12%, Zr 0.14-0.18%, Ti 0.02-0.04%, impurity 0-0.06%, surplus Al.
4. a kind of preparation work of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy as described in any one of claim 1-3 Skill, which comprises the steps of:
(1) with rafifinal, industrial-purity zinc, pure magnesium, aluminum bronze intermediate alloy, scandium bearing master alloy, aluminium erbium intermediate alloy, aluminium zirconium Intermediate alloy, titanium agent are raw material, wherein purity >=99.95wt% of rafifinal, purity >=99.95wt% of industrial-purity zinc, work Purity >=99.99wt% of the pure magnesium of industry, content accounting >=50wt% of copper in aluminum bronze intermediate alloy, scandium contains in scandium bearing master alloy Accounting >=2wt% is measured, erbium content accounting >=10wt% in aluminium erbium intermediate alloy, the content accounting of zirconium in aluminium zirconium hardener >= 5wt%, Ti content accounting >=75wt% in titanium agent；
Each raw material is converted and weighed according to the ratio, is mixed, heating in high temperature furnace is placed in, and fusing obtains melt；
(2) after mixing evenly by the melt in step (1), sample, detected using spectrometer, according to actual constituent deviation into Row feed supplement；
(3) refining slagging-off；
(4) it casts, obtains ingot casting；Period, the control of casting operation temperature control melt during 700-720 DEG C, casting operation Middle hydrogen content is no more than 0.12ml/100g；
(5) Homogenization Treatments are carried out to the ingot casting obtained in step (4): is first warming up to 385-420 DEG C, keep the temperature 10-14h, then rise Temperature after keeping the temperature 20-26h, cools to 270-320 DEG C with the furnace, comes out of the stove and be air-cooled to room temperature to 460-500 DEG C；
(6) solution treatment is carried out to the ingot casting after Homogenization Treatments；Period is first warming up to 440-500 DEG C, keeps the temperature 1.4-4.5h, Then in room temperature quenching-in water；
(7) under the conditions of the ingot casting after solution treatment being placed in 110-140 DEG C, ageing treatment 20-28h obtains aluminium alloy finished product.
5. a kind of preparation process of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy according to claim 4, feature exist In refining in step (3) slagging-off process is as follows: first successively carrying out injection refining, stand, skim, then carry out villaumite refining, quiet Set, skim, be then at least repeated once villaumite refine, stand, process of skimming, be finally passed through into melt argon gas stirring.
6. a kind of preparation process of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy according to claim 5, feature exist In the melt temperature in step (3) is 735-745 DEG C.
7. a kind of preparation process of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy according to claim 4, feature exist In further including the process for carrying out hot extrusion to ingot casting between step (5) and step (6), controlled at 430- when hot extrusion 445 DEG C, control extrusion ratio is 23-26.
8. a kind of preparation process of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy according to claim 4, feature exist In, when carrying out Homogenization Treatments to ingot casting in step (5), 420 DEG C are first warming up to, keeps the temperature 10h, then be warming up to 465 DEG C, heat preservation For 24 hours, 310 DEG C are then cooled to the furnace, comes out of the stove and is air-cooled to room temperature.
9. a kind of preparation process of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy according to claim 4, feature exist In when carrying out solution treatment to ingot casting in step (6), being first warming up to 460 DEG C, 2.5h kept the temperature, then in room temperature quenching-in water.
10. a kind of preparation process of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy according to claim 4, feature It is, in step (7), under the conditions of ingot casting is placed in 110 DEG C, ageing treatment for 24 hours, obtains aluminium alloy finished product.
CN201910324475.9A 2019-04-22 2019-04-22 A kind of superpower high-ductility Al-Zn-Mg-Cu aluminum alloy and its preparation process Pending CN110042287A (en)

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Application publication date: 20190723