CN113737068A - High-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy and processing method thereof - Google Patents
High-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy and processing method thereof Download PDFInfo
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Abstract
The invention discloses a high-strength, high-toughness and corrosion-resistant 7xxx series alloy and a processing method thereof, wherein the aluminum alloy comprises the following components in percentage by weight: 8.8 to 10 percent of Zn, 2.0 to 3.0 percent of Mg, 1.0 to 2.5 percent of Cu, 0.05 to 0.2 percent of Zr, 0.01 to 0.15 percent of Ti, less than or equal to 0.1 percent of Mn, less than or equal to 0.2 percent of Fe, less than or equal to 0.1 percent of Si, less than or equal to 0.15 percent of the total content of other impurity elements and the balance of Al; wherein Zn + Mg + Cu is more than or equal to 12 percent and less than or equal to 15.5 percent, Zn/Mg is more than or equal to 3 and less than or equal to 5 percent, and Cu/Mg is more than or equal to 0.3 and less than or equal to 1. The aluminum alloy has high toughness, good stress corrosion resistance and excellent forming and processing performances, and effectively solves the problems of insufficient toughness matching, poor stress corrosion and the like of high-strength aluminum alloy materials in the prior art. The alloy bar and the alloy section have yield strength of more than 700MPa, tensile strength of more than 730MPa, elongation of more than 9 percent and electric conductivity of more than or equal to 30 percent IACS in a state of peak aging T6. The prepared bar and section bar can be widely applied to the fields of aviation, aerospace, nuclear industry, transportation, weapons and the like.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy, and relates to a high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy and a processing method thereof.
Background
In recent years, with the increasingly stringent demand for weight reduction of structures, especially in the field of aerospace, the demand is extremely outstanding, and therefore, further improvement of the strength of light-weight ultrahigh-strength aluminum alloy is more important. At present, with the improvement of aluminum metallurgical equipment and technical level, high purity and high alloying enable 600 MPa-grade aluminum alloy to be successfully prepared by the traditional casting technology and reach the industrial application level, such as 7150 and 7055 aluminum alloy. Because the ultrahigh-strength aluminum alloy has certain cost advantage compared with the titanium alloy, the ultrahigh-strength aluminum alloy replaces the expensive titanium alloy in many fields. At present, ultrahigh-strength aluminum alloy materials with tensile strength of about 650MPa are developed in countries such as Europe and America and are successfully applied, such as 7168, 7136 and 7056 alloys. However, for 700 MPa-grade ultrahigh-strength aluminum alloy, at present, domestic and overseas reports mainly focus on high-solute alloy (the Zn content is more than or equal to that of the alloy) prepared by adopting special technologies such as rapid solidification, powder metallurgy or spray forming, and the like, but compared with the traditional semi-continuous casting process, the high-solute alloy has the obvious defects of complex process, higher cost, small size and specification, difficult machining and the like, is difficult to apply to large-scale structural members in batches, and cannot realize industrial large-scale production and application.
Although some patent documents CN201410249786.0, CN201010556640.2, CN200910210975.6, CN201510716592.1 and the like report that the ultra-high strength aluminum alloy with tensile strength of above 700MPa can be prepared by adding high content of Zn element or adopting T77 three-stage aging process, the Zn content added in most alloys exceeds 10%, the problem of easy cracking and difficult realization of industrial application exists in ingot forming, besides the difficulty of ingot forming, high alloying can form many coarse and large non-equilibrium eutectic phases with grain boundary in the crystal, and the conventional homogenization and solution process is difficult to eliminate completely, and the alloy performance is difficult to be improved greatly. In patent CN03119605.5, a high Zn content cast ingot is prepared by adopting rapid solidification spray forming, the solid solubility of an aluminum matrix is improved by accelerating the solidification cooling rate, and the Zn content is higher than 10.0-11.0%. However, the patent adopts an unconventional fusion casting method, and the processing cost is higher. Patent CN201910183759.0 discloses a high-toughness aluminum alloy and a preparation method thereof, wherein micro-alloying is carried out by adding trace Sc element. However, Sc is expensive, which limits the application range. In addition, the above patent usually adopts the limit soaking and solid solution process to carry out heat treatment, and the soaking and solid solution temperature reaches 475 ℃ to 485 ℃. The extreme high temperature heat treatment process is very difficult to control for the traditional large-size cast ingot, and overburning is very easy to occur in the actual industrial production, so that the tissue defect is inherited into the final product.
In summary, although there are some reports about the preparation of 700 MPa-level ultrahigh-strength aluminum alloy materials by conventional casting, the aluminum alloy materials are basically small-specification samples prepared in laboratories, and the large-specification ultrahigh-strength aluminum alloy material which can be prepared by the industrialized semicontinuous casting process developed by the invention has high strength, good corrosion performance and processing and forming performance, and low cost, is suitable for mass production, and has important significance.
Disclosure of Invention
The technical problem to be solved by the invention is as follows:
the defects in the prior art are overcome, the high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy and the processing method thereof are provided through reasonable matching of main alloy components, regulation and control of a proper amount of microalloy elements and accurate control of the processing technology, the alloy has high strength, good corrosion performance and processing and forming performance, and low production cost, so that the alloy smelting is simpler, and the preparation process method is simpler.
In order to solve the technical problem, the invention provides a 7 xxx-series bar, a wire and a processing method thereof, wherein the 7 xxx-series bar has high strength, high toughness, corrosion resistance and good forming performance, and the aluminum alloy comprises the following components in percentage by weight: 8.8 to 10 percent of Zn, 2.0 to 3.0 percent of Mg, 1.0 to 2.5 percent of Cu, 0.05 to 0.2 percent of Zr, 0.01 to 0.15 percent of Ti, less than or equal to 0.1 percent of Mn, less than or equal to 0.2 percent of Fe, less than or equal to 0.1 percent of Si, less than or equal to 0.15 percent of the total content of other impurity elements and the balance of Al; wherein Zn + Mg + Cu is more than or equal to 12 percent and less than or equal to 15.5 percent, Zn/Mg is more than or equal to 3 and less than or equal to 5 percent, and Cu/Mg is more than or equal to 0.3 and less than or equal to 1.
Preferably, the aluminum alloy further comprises Er, wherein Er is 0.01-0.2%.
Preferably, the aluminum alloy comprises the following components in percentage by weight: 8.8 to 10 percent of Zn, 2.0 to 3.0 percent of Mg, 1.0 to 2.0 percent of Cu, 0.08 to 0.15 percent of Zr, 0.01 to 0.15 percent of Ti, less than or equal to 0.1 percent of Mn, less than or equal to 0.2 percent of Fe, less than or equal to 0.1 percent of Si, less than or equal to 0.15 percent of the total content of other impurity elements and the balance of Al, wherein the content of Zn, Mg and Cu is more than or equal to 12 percent and less than or equal to 15 percent, the content of Zn/Mg is more than or equal to 3 and less than or equal to 4.5, and the content of Cu/Mg is more than or equal to 0.4 and less than or equal to 1.
Preferably, the aluminum alloy comprises the following components in percentage by weight: 8.8 to 10 percent of Zn, 2.0 to 3.0 percent of Mg, 1.5 to 2.0 percent of Cu, 0.08 to 0.15 percent of Zr, 0.01 to 0.2 percent of Er, 0.01 to 0.15 percent of Ti, less than or equal to 0.1 percent of Mn, less than or equal to 0.2 percent of Fe, less than or equal to 0.1 percent of Si, less than or equal to 0.15 percent of the total content of other impurity elements, and the balance of Al, wherein the content of Zn, Mg and Cu is more than or equal to 12 percent and less than or equal to 15 percent, the content of Zn/Mg is more than or equal to 3 and less than or equal to 4.5, and the content of Cu/Mg is more than or equal to 0.4 and less than or equal to 1.
The processing method of the high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following steps:
smelting in step (1): adding high-purity aluminum ingots into intermediate alloy, smelting in a smelting furnace, and slagging off when furnace burden is completely melted and within a smelting temperature range. Adopting powder injection refining in a smelting furnace; obtaining a cast ingot by adopting semi-continuous casting;
and (2) carrying out multistage homogenization treatment on the ingot of the alloy, wherein the multistage homogenization treatment process comprises the following steps: carrying out heat treatment in a slow heating mode from room temperature, heating the ingot from the room temperature to 450 ℃ at a speed of 10-50 ℃/h, and preserving heat for 5-10 h; then heating to 465-480 ℃ at the speed of 1-30 ℃/h, preserving heat for 10-60h, and then cooling at a certain cooling rate.
Step (3) heating the ingot obtained in the step (2) to 400-470 ℃ and extruding the ingot into a bar; the speed of the extrusion outlet of the section is 0.1-4mm/s, the extrusion temperature is 400-;
carrying out solid solution quenching on the extruded bar blank in the step (4), wherein the solid solution temperature is 468-; then water quenching is carried out;
pre-stretching the bar to remove residual stress, wherein the pre-stretching amount is controlled to be 0.5-3%;
and (6) carrying out finished product aging heat treatment on the bar.
Preferably, in the step (2), the soaking process of the ingot is carried out by heating the ingot from room temperature in a slow heating mode, the ingot is heated from room temperature to 350 ℃ at a speed of 10-50 ℃/h, and the temperature is kept for 1-10 h; then heating to 350-; then heating to 465-480 ℃ at the speed of 1-30 ℃/h, preserving heat for 10-60h, and then rapidly cooling at the cooling speed of more than or equal to 30 ℃/h.
Preferably, the ingot extrusion temperature in the step (3) is 400-440 ℃, the extrusion outlet speed is 0.1-1mm/s, the extrusion outlet temperature is 380-430 ℃, and the extrusion ratio is more than or equal to 8.
Preferably, the bar extruded in the step (4) is subjected to solution treatment, the solution temperature is 468-; preferably, the bar material in the quenching state in the step (5) is pre-stretched, and the pre-stretching amount is controlled to be 0.5-2.8%;
preferably, the aging process of the step (6) is as follows: after T6 treatment at the temperature of 105 ℃ and 120 ℃ for 16-36h, the yield strength of the obtained aluminum alloy is more than 700MPa, the tensile strength is more than 730MPa, the elongation is more than 9%, and the conductivity is more than or equal to 30% IACS.
The invention has the beneficial effects that:
(1) the invention takes into account the combined matching effect of alloy composition on structure and strength, toughness and corrosion performance. The total amount of main alloy element components Zn + Mg + Cu is optimized and adjusted, and the Zn/Mg ratio and the Cu/Mg ratio are controlled at the same time, so that the Zn, Mg and Cu elements in the matrix are promoted to exist in the matrix in a precipitated phase mode to the maximum extent; meanwhile, the trace elements such as Ti, Mn, Cr and the like are properly added, and the composite strengthening effects such as solid solution strengthening, precipitation strengthening, grain refining and the like are fully exerted. Through component control, the composition of a precipitated phase in a microstructure is optimized and adjusted, and the toughness, particularly the corrosion resistance, of the material is considered while the strength of the material is ensured.
(2) The alloy of the invention is added with trace rare earth Er elementElement, coordinating Er and Zr microalloying characteristics and promoting Al3The fine dispersion precipitation of (Zr, Er) phase reduces the spacing between non-precipitated strips of crystal boundary and effectively improves Al3The precipitation number density of the (Zr, Er) phase finally effectively improves the corrosion resistance and the toughness of the alloy.
(3) The invention adopts the slow heating multi-stage soaking treatment and the rapid cooling process in the process to promote the pre-nucleation phase Al3Er phase is precipitated in the process of slow temperature rise and is used as a prefabricated nucleation point to promote disperse phase Al3The (Zr, Er) phase is uniformly dispersed and precipitated, and meanwhile, the rapid cooling process is adopted to effectively inhibit MgZn in the quenching and cooling process2The phase is separated out and further coarsened and grown.
(4) The invention reasonably selects high-temperature solid solution heating and faster cooling rate in process, effectively improves the purity of the final microstructure of the material, and inhibits the precipitation of a second phase in the quenching process. Meanwhile, the proper pre-stretching and aging process is optimized and matched, so that the alloy in-crystal phase and the grain boundary phase are well matched, and the comprehensive matching of the strength and the corrosion performance of the bar and the wire is finally ensured.
(5) The invention has the advantages of simple alloy components, no need of adding noble metal elements such as Sc and the like, simple casting process, simple preparation process, low cost and the like.
In conclusion, the aluminum alloy product prepared by the process has high mechanical property and excellent forming property, and is far higher than the alloy prepared by the conventional process.
Drawings
FIG. 1 is the as-aged microstructure of example 1.
FIG. 2 shows homogenized and dispersed Al3A (Zr, Er) phase, (a) the example 7 alloy; (b) the alloy of comparative example 1.
FIG. 3 shows coarse Al in comparative example 23An Er phase.
Detailed Description
The present invention will be further described with reference to the drawings, specific embodiments and comparative examples, but the present invention is not limited to the following examples.
Example 1
A high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following components in percentage by weight: 9.0% of Zn, 2.2% of Mg, 1.6% of Cu, 0.12% of Zr, 0.02% of Ti, 0.1% of Fe, 0.08% of Si, 0.08% of Mn, and the balance Al, 12.8% of Zn + Mg + Cu, 4.1% of Zn/Mg, and 0.7% of Cu/Mg.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification cast ingot with the diameter of 410mm by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the cast ingot, slowly heating up to 400 ℃ from room temperature at a heating rate of 50 ℃/h, preserving heat for 10h, heating up to 475 ℃ at a heating rate of 5 ℃/h, preserving heat for 48h, and cooling at a cooling rate of 30 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 430 ℃. Extruding the material at 410 deg.C and extrusion outlet speed of 0.5 mm/s; extruding to a bar material with the diameter of 125mm, wherein the extrusion outlet temperature is 385 ℃, and the extrusion ratio is 10.7;
(4) carrying out solution treatment on the extruded bar, and carrying out water quenching after heat preservation at 475 ℃ for 8 h;
(5) pre-stretching the quenched bar material, wherein the pre-stretching amount is 1.5%;
(6) and carrying out aging heat treatment on the quenched pre-stretched bar, wherein the aging system is 110 ℃/30 h.
Example 2
A high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following components in percentage by weight: zn 9%, Mg 2.0%, Cu 1.0%, Zr 0.2%, Ti 0.15%, Fe 0.2%, Si 0.1%, Mn 0.08%, and the balance Al, 12% Zn + Mg + Cu, 4.5% Zn/Mg, and 0.5% Cu/Mg.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification cast ingot with the diameter of 410mm by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the cast ingot, slowly heating up to 450 ℃ from room temperature at a heating rate of 10 ℃/h, preserving heat for 10h, heating up to 480 ℃ at a heating rate of 10 ℃/h, preserving heat for 60h, and cooling at a cooling rate of 70 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 430 ℃. Extruding the material at 410 deg.C and 4mm/s extrusion outlet speed; extruding to a bar material with the diameter of 125mm, wherein the extrusion outlet temperature is 385 ℃, and the extrusion ratio is 10.7;
(4) carrying out solution treatment on the extruded bar, and carrying out water quenching after heat preservation at 470 ℃ for 8 h;
(5) pre-stretching the quenched bar material, wherein the pre-stretching amount is 1.5%;
(6) and carrying out aging heat treatment on the quenched pre-stretched bar, wherein the aging system is 120 ℃/24 h.
Example 3
A high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following components in percentage by weight: 10% of Zn, 2.8% of Mg, 1.5% of Cu, 0.15% of Zr, 0.1% of Ti, 0.05% of Fe, 0.05% of Si, 0.08% of Mn, and the balance of Al, 14.3% of Zn + Mg + Cu, 3.6% of Zn/Mg, and 0.5% of Cu/Mg.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification cast ingot with the diameter of 410mm by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the cast ingot, slowly heating to 300 ℃ from room temperature at a heating rate of 15 ℃/h, preserving heat for 10h, heating to 465 ℃ at a heating rate of 15 ℃/h, preserving heat for 20h, and cooling at a cooling rate of 100 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 430 ℃. Extruding the material at 410 ℃ and an extrusion outlet speed of 2 mm/s; extruding to a bar material with the specification of phi 125mm, wherein the temperature of an extrusion outlet is 380 ℃, and the extrusion ratio is 10.7;
(4) carrying out solution treatment on the extruded bar, and carrying out water quenching after heat preservation at 470 ℃ for 10 h;
(5) pre-stretching the quenched bar material, wherein the pre-stretching amount is 1.5%;
(6) and carrying out aging heat treatment on the quenched pre-stretched bar, wherein the aging system is 120 ℃/16 h.
Example 4
A high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following components in percentage by weight: 9.5% of Zn, 3.0% of Mg, 2.5% of Cu, 0.1% of Zr, 0.05% of Ti, 0.15% of Fe, 0.03% of Si, 0.08% of Mn, and the balance Al, 15% of Zn + Mg + Cu, 3.2% of Zn/Mg, and 0.8% of Cu/Mg.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification cast ingot with the diameter of 410mm by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the cast ingot, slowly heating up to 450 ℃ from room temperature at a heating rate of 40 ℃/h, preserving heat for 5h, then heating up to 472 ℃ at a heating rate of 20 ℃/h, preserving heat for 36h, and cooling at a cooling rate of 200 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 430 ℃. Extruding the material at 410 deg.C and extrusion outlet speed of 0.5 mm/s; extruding to a bar material with the diameter of 125mm, wherein the temperature of an extrusion outlet is 400 ℃, and the extrusion ratio is 10.7;
(4) carrying out solution treatment on the extruded bar, and carrying out water quenching after heat preservation at 472 ℃ for 15 h;
(5) pre-stretching the quenched bar material, wherein the pre-stretching amount is 1.5%;
(6) and carrying out aging heat treatment on the quenched pre-stretched bar, wherein the aging system is 120 ℃/24 h.
Example 5
A high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following components in percentage by weight: 8.8% of Zn, 2.0% of Mg, 2.0% of Cu, 0.08% of Zr, 0.01% of Er, 0.15% of Ti, 0.2% of Fe, 0.05% of Si, 0.08% of Mn and the balance of Al, wherein Zn + Mg + Cu is 12.8%, Zn/Mg is 4.4 and Cu/Mg is 1.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification cast ingot with the diameter of 410mm by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the cast ingot, slowly heating to 350 ℃ from room temperature at a heating rate of 50 ℃/h, preserving heat for 10h, heating to 470 ℃ at a heating rate of 5 ℃/h, preserving heat for 48h, and cooling at a cooling rate of 50 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 430 ℃. Extruding the material at the extrusion temperature of 450 ℃ and the extrusion outlet speed of 1 mm/s; extruding to a bar material with the diameter of 125mm, wherein the temperature of an extrusion outlet is 430 ℃, and the extrusion ratio is 10.7;
(4) carrying out solution treatment on the extruded bar, and carrying out water quenching after heat preservation at 480 ℃ for 10 h;
(5) pre-stretching the quenched bar material, wherein the pre-stretching amount is 1.5%;
(6) and carrying out aging heat treatment on the quenched pre-stretched bar, wherein the aging system is 105 ℃/36 h.
Example 6
A high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following components in percentage by weight: 8.9% of Zn, 2.2% of Mg, 1.8% of Cu, 0.10% of Zr, 0.15% of Er, 0.02% of Ti, 0.1% of Fe, 0.08% of Si, 0.08% of Mn, and the balance of Al, wherein Zn + Mg + Cu is 12.9%, Zn/Mg is 4.0, and Cu/Mg is 0.8.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification cast ingot with the diameter of 410mm by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the alloy cast ingot, slowly heating up to 250 ℃ from room temperature at a heating rate of 20 ℃/h, preserving heat for 10h, slowly heating up to 400 ℃ at a heating rate of 50 ℃/h, preserving heat for 10h, heating up to 470 ℃ at a heating rate of 5 ℃/h, preserving heat for 48h, and cooling at a cooling rate of 100 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 430 ℃. Extruding the material at the extrusion temperature of 440 ℃ and the extrusion outlet speed of 0.5 mm/s; extruding to a bar material with the specification of phi 125mm, wherein the extrusion outlet temperature is 395 ℃, and the extrusion ratio is 10.7;
(4) carrying out solution heat treatment on the extruded bar, and carrying out water quenching after keeping the temperature at 470 ℃ for 20 h;
(5) pre-stretching the quenched bar material, wherein the pre-stretching amount is 1.5%;
(6) and carrying out aging heat treatment on the quenched pre-stretched bar, wherein the aging system is 120 ℃/24 h.
Example 7
A high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following components in percentage by weight: 9.0% of Zn, 2.5% of Mg, 1.4% of Cu, 0.12% of Zr, 0.1% of Er, 0.02% of Ti, 0.1% of Fe, 0.08% of Si, 0.08% of Mn, and the balance of Al, wherein Zn + Mg + Cu is 12.9%, Zn/Mg is 3.6, and Cu/Mg is 0.6.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification cast ingot with the diameter of 410mm by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the alloy cast ingot, slowly heating up to 280 ℃ from room temperature at a heating rate of 10 ℃/h, preserving heat for 8h, slowly heating up to 350 ℃ from room temperature at a heating rate of 30 ℃/h, preserving heat for 5h, heating up to 480 ℃ at a heating rate of 10 ℃/h, preserving heat for 60h, and cooling at a cooling rate of 70 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 430 ℃. Extruding the material at 410 deg.C and extrusion outlet speed of 0.5 mm/s; extruding to obtain a bar material with the diameter of 60mm, wherein the extrusion outlet temperature is 390 ℃, and the extrusion ratio is 46.7;
(4) carrying out solution heat treatment on the extruded bar, and carrying out water quenching after keeping the temperature at 470 ℃ for 4 h;
(5) pre-stretching the quenched bar material, wherein the pre-stretching amount is 1.5%;
(6) and carrying out aging heat treatment on the quenched pre-stretched bar, wherein the aging system is 120 ℃/24 h.
Example 8
A high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following components in percentage by weight: 9.2% of Zn, 2.5% of Mg, 1.5% of Cu, 0.12% of Zr, 0.15% of Er, 0.02% of Ti, 0.1% of Fe, 0.08% of Si, 0.08% of Mn, and the balance of Al, wherein Zn + Mg + Cu is 13.2%, Zn/Mg is 3.7, and Cu/Mg is 0.6.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification cast ingot with the diameter of 410mm by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the alloy cast ingot, slowly heating up to 350 ℃ from room temperature at a heating rate of 20 ℃/h, preserving heat for 10h, then slowly heating up to 400 ℃ at a heating rate of 50 ℃/h, preserving heat for 10h, heating up to 470 ℃ at a heating rate of 5 ℃/h, preserving heat for 48h, and cooling at a cooling rate of 100 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 430 ℃. Extruding the material at 420 ℃ and an extrusion outlet speed of 0.5 mm/s; extruding to a bar material with the diameter of 125mm, wherein the temperature of an extrusion outlet is 400 ℃, and the extrusion ratio is 10.7;
(4) carrying out solution heat treatment on the extruded bar, and carrying out water quenching after keeping the temperature at 470 ℃ for 8 h;
(5) pre-stretching the quenched bar material, wherein the pre-stretching amount is 1.5%;
(6) and carrying out peak value aging heat treatment on the quenched pre-stretched bar, wherein the aging system is 120 ℃/24 h.
Example 9
A high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following components in percentage by weight: 9.5% of Zn, 2.8% of Mg, 1.3% of Cu, 0.12% of Zr, 0.13% of Er, 0.02% of Ti, 0.1% of Fe, 0.08% of Si, 0.08% of Mn, and the balance of Al, wherein Zn + Mg + Cu is 13.6%, Zn/Mg is 3.4, and Cu/Mg is 0.5.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification cast ingot with the diameter of 410mm by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the alloy cast ingot, slowly heating up to 350 ℃ from room temperature at a heating rate of 40 ℃/h, preserving heat for 3h, slowly heating up to 380 ℃ from room temperature at a heating rate of 10 ℃/h, preserving heat for 6h, heating up to 465 ℃ at a heating rate of 15 ℃/h, preserving heat for 15h, and cooling at a cooling rate of 30 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 410 ℃. Extruding the material at the extrusion temperature of 440 ℃ and the extrusion outlet speed of 1 mm/s; extruding to a bar material with the diameter of 125mm, wherein the temperature of an extrusion outlet is 410 ℃, and the extrusion ratio is 10.7;
(4) carrying out solution heat treatment on the extruded bar, and carrying out water quenching after keeping the temperature at 470 ℃ for 6 h;
(5) pre-stretching the quenched bar material, wherein the pre-stretching amount is 1.5%;
(6) and carrying out peak value aging heat treatment on the quenched pre-stretched bar, wherein the aging system is 120 ℃/24 h.
Example 10
A high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following components in percentage by weight: 9.7% of Zn, 3.0% of Mg, 1.3% of Cu, 0.12% of Zr, 0.12% of Er, 0.02% of Ti, 0.1% of Fe, 0.08% of Si, 0.08% of Mn, and the balance of Al, wherein Zn + Mg + Cu is 14%, Zn/Mg is 3.2, and Cu/Mg is 0.4.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification phi 162mm ingot by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the alloy cast ingot, slowly heating to 400 ℃ from room temperature at a heating rate of 50 ℃/h, preserving heat for 10h, heating to 470 ℃ at a heating rate of 5 ℃/h, preserving heat for 48h, and cooling at a cooling rate of 300 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 400 ℃. Extruding the material at 390 ℃ and an extrusion outlet speed of 0.5 mm/s; extruding to 6 × 40mm specification band plate, wherein the extrusion outlet temperature is 360 ℃, and the extrusion ratio is 89;
(4) carrying out solution heat treatment on the extruded strip plate, keeping the temperature at 470 ℃ for 5h, and then carrying out water quenching;
(5) pre-stretching the quenched bar material, wherein the pre-stretching amount is 1%;
(6) and carrying out peak value aging heat treatment on the quenched pre-stretched bar, wherein the aging system is 120 ℃/24 h.
Example 11
A high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following components in percentage by weight: 9.8% of Zn, 2.9% of Mg, 1.3% of Cu, 0.10% of Zr, 0.2% of Er, 0.02% of Ti, 0.1% of Fe, 0.08% of Si, 0.08% of Mn, and the balance of Al, wherein Zn + Mg + Cu is 14%, Zn/Mg is 3.4, and Cu/Mg is 0.4.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification phi 162mm ingot by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the alloy cast ingot, slowly heating up to 300 ℃ from room temperature at a heating rate of 35 ℃/h, keeping the temperature for 1h, slowly heating up to 400 ℃ from room temperature at a heating rate of 1 ℃/h, keeping the temperature for 5h, heating up to 465 ℃ at a heating rate of 1 ℃/h, keeping the temperature for 10h, and cooling at a cooling rate of 70 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 430 ℃. Extruding the material at 410 deg.C and extrusion outlet speed of 0.5 mm/s; extruding to 6 × 40mm specification band plate, wherein the extrusion outlet temperature is 390 ℃, and the extrusion ratio is 89;
(4) carrying out solution heat treatment on the extruded strip plate, keeping the temperature at 470 ℃ for 2h, and then carrying out water quenching;
(5) pre-stretching the quenched bar material, wherein the pre-stretching amount is 1%;
(6) and carrying out peak value aging heat treatment on the quenched pre-stretched bar, wherein the aging system is 120 ℃/24 h.
Example 12
A high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following components in percentage by weight: 8.8% of Zn, 2.0% of Mg, 2.0% of Cu, 0.08% of Zr, 0.05% of Er, 0.10% of Ti, 0.15% of Fe, 0.08% of Si, 0.08% of Mn, and the balance of Al, wherein Zn + Mg + Cu is 12.8%, Zn/Mg is 4.4, and Cu/Mg is 1.0.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification phi 162mm ingot by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the alloy cast ingot, slowly heating to 300 ℃ from room temperature at a heating rate of 50 ℃/h, preserving heat for 10h, slowly heating to 400 ℃ from room temperature at a heating rate of 50 ℃/h, preserving heat for 10h, heating to 480 ℃ at a heating rate of 5 ℃/h, preserving heat for 48h, and cooling at a cooling rate of 70 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 430 ℃. Extruding the material at 410 deg.C and extrusion outlet speed of 0.3 mm/s; extruding to 6 × 40mm specification band plate, wherein the extrusion outlet temperature is 390 ℃, and the extrusion ratio is 89;
(4) carrying out solution heat treatment on the extruded strip plate, keeping the temperature at 475 ℃ for 1h, and then carrying out water quenching;
(5) pre-stretching the quenched bar material, wherein the pre-stretching amount is 3%;
(6) and carrying out peak value aging heat treatment on the quenched pre-stretched bar, wherein the aging system is 120 ℃/24 h.
Example 13
A high-strength and high-toughness corrosion-resistant 7xxx series aluminum alloy comprises the following components in percentage by weight: zn10.0%, Mg 3.0%, Cu 1.5%, Zr 0.12%, Er 0.2%, Ti 0.08%, Fe 0.15%, Si 0.08%, Mn 0.08%, and the balance Al, Zn + Mg + Cu being 14.5%, Zn/Mg being 3.3, and Cu/Mg being 0.5.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification phi 162mm ingot by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the alloy cast ingot, slowly heating to 320 ℃ from room temperature at a heating rate of 50 ℃/h, preserving heat for 10h, slowly heating to 450 ℃ from room temperature at a heating rate of 35 ℃/h, preserving heat for 5h, heating to 470 ℃ at a heating rate of 15 ℃/h, preserving heat for 55h, and cooling at a cooling rate of 70 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 430 ℃. Extruding the material at 410 deg.C and extrusion outlet speed of 0.5 mm/s; extruding to 6 × 40mm specification band plate, wherein the extrusion outlet temperature is 390 ℃, and the extrusion ratio is 89;
(4) carrying out solution heat treatment on the extruded strip plate, and carrying out water quenching after heat preservation at 465 ℃ for 0.5 h;
(5) pre-stretching the extruded strip plate, wherein the pre-stretching amount is 2%;
(6) and carrying out peak value aging heat treatment on the quenched pre-stretched strip plate, wherein the aging system is 120 ℃/24 h.
Comparative example 1
A7 xxx series aluminum alloy comprises the following components in percentage by weight: zn9.2%, Mg 1.8%, Cu 2.0%, Zr 0.12%, Ti 0.02%, Fe 0.4%, Si 0.04%, Cr 0.2%, Mn 0.08%, and the balance Al, 13% Zn + Mg + Cu, 5.1% Zn/Mg, and 1.1% Cu/Mg.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification phi 162mm ingot by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the alloy ingot, heating to 470 ℃, preserving the heat for 60h, and cooling at the cooling speed of 20 ℃/h;
(3) extruding the material at 410 deg.C and extrusion outlet speed of 0.8 mm/s; extruding a finished product of 10mm multiplied by 100mm strip plate with the extrusion ratio of 21;
(4) carrying out solution heat treatment on the extruded strip plate, keeping the temperature at 470 ℃ for 4h, and then carrying out water quenching;
(5) pre-stretching the extruded strip plate, wherein the pre-stretching amount is 1%;
(6) and carrying out peak value aging heat treatment on the quenched pre-stretched strip plate, wherein the aging system is 120 ℃/30 h.
Comparative example 2
A7 xxx series aluminum alloy comprises the following components in percentage by weight: zn8.8%, Mg 2.1%, Cu 2.0%, Zr 0.12%, Er 0.35%, Ti 0.02%, Fe 0.4%, Si 0.04%, Cr 0.2%, Mn 0.08%, and the balance Al, Zn + Mg + Cu being 12.9%, Zn/Mg being 4.2, and Cu/Mg being 0.95.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification phi 162mm ingot by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the alloy cast ingot, heating to 475 ℃, preserving the heat for 48h, and cooling at the cooling speed of 20 ℃/h;
(3) extruding the material at 410 deg.C and extrusion outlet speed of 0.8 mm/s; extruding a finished product of 10mm multiplied by 100mm strip plate with the extrusion ratio of 21;
(4) carrying out solution heat treatment on the extruded strip plate, keeping the temperature at 470 ℃ for 4h, and then carrying out water quenching;
(5) pre-stretching the extruded strip plate, wherein the pre-stretching amount is 1%;
(6) and carrying out peak value aging heat treatment on the quenched pre-stretched strip plate, wherein the aging system is 120 ℃/30 h.
Comparative example 3
A7 xxx series aluminum alloy comprises the following components in percentage by weight: zn8.8%, Mg 3.5%, Cu 1.4%, Zr 0.12%, Ti 0.02%, Fe 0.4%, Si 0.04%, Cr 0.2%, Mn 0.08%, and the balance Al, Zn + Mg + Cu being 13.7%, Zn/Mg being 2.5, and Cu/Mg being 0.4.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification phi 162mm ingot by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the alloy cast ingot, heating to 475 ℃, preserving the heat for 48h, and cooling at the cooling speed of 20 ℃/h;
(3) extruding the material at 410 deg.C and extrusion outlet speed of 0.8 mm/s; extruding a finished product of 10mm multiplied by 100mm strip plate with the extrusion ratio of 21;
(4) carrying out solution heat treatment on the extruded strip plate, keeping the temperature at 470 ℃ for 4h, and then carrying out water quenching;
(5) pre-stretching the extruded strip plate, wherein the pre-stretching amount is 1%;
(6) and carrying out peak value aging heat treatment on the quenched pre-stretched strip plate, wherein the aging system is 120 ℃/30 h.
Comparative example 4
A7 xxx series aluminum alloy comprises the following components in percentage by weight: zn 7%, Mg 2%, Cu 1.5%, Zr 0.12%, Ti 0.02%, Fe 0.4%, Si 0.04%, Cr 0.2%, Mn 0.08%, and the balance Al, 10.5% Zn + Mg + Cu, 3.5% Zn/Mg, and 0.75% Cu/Mg.
The processing method of the aluminum alloy comprises the following steps:
(1) adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and obtaining a large-specification cast ingot with the diameter of 410mm by adopting semi-continuous casting;
(2) carrying out homogenization heat treatment on the cast ingot, slowly heating up to 400 ℃ from room temperature at a heating rate of 50 ℃/h, preserving heat for 10h, heating up to 475 ℃ at a heating rate of 5 ℃/h, preserving heat for 48h, and cooling at a cooling rate of 20 ℃/h;
(3) turning a cast ingot, sawing, heating the cast ingot in an induction furnace before extruding, wherein the heating temperature of the cast ingot is 430 ℃. Extruding the material at 410 deg.C and extrusion outlet speed of 0.5 mm/s; extruding to a bar material with the diameter of 125mm, wherein the extrusion outlet temperature is 385 ℃, and the extrusion ratio is 10.7;
(4) carrying out solution treatment on the extruded bar, and carrying out water quenching after heat preservation at 475 ℃ for 8 h;
(5) pre-stretching the quenched bar material, wherein the pre-stretching amount is 1.5%;
(6) and carrying out aging heat treatment on the quenched pre-stretched bar, wherein the aging system is 120 ℃/24 h.
Table 1 shows the performance index of the alloys of the invention and comparative alloys in the aged state and the corresponding quantitative analysis results of the microstructure.
TABLE 1 comparison of the Properties of the alloys of the examples and comparative examples
As shown in Table 1, the invention can lead the material to obtain higher mechanical property, simultaneously have good and high conductivity and also have good stress corrosion performance by optimizing the alloy components and reasonably controlling the processing technology system. In addition, the final state tissue of this embodiment is a fibrous deformation tissue, as shown in fig. 1. FIG. 2 is a comparison of the homogenized annealed microstructures of example 7 and comparative example 1, and it can be seen that the addition of rare earth Er is beneficial to Al3(Zr, Er) phase is dispersed and precipitated uniformlyAnd no precipitation zone of the grain boundary is narrow. In the conventional alloy such as the alloy of comparative example 1, the spacing between the non-precipitated zones is obvious near the grain boundary, and the precipitated dispersed phase is not uniform enough, which is not favorable for the toughness of the material.
The proper Zn/Mg ratio is beneficial to improving the mechanical property of the 7xxx series alloy, in the comparative example 1, the Mg content is lower, the Zn/Mg is 5.1, and the strength of the material is not improved at an excessively high Zn/Mg. The Mg content in comparative example 3 was high, reaching 3.5%, and the electrical conductivity was significantly reduced despite its high strength. This is mainly because the main strengthening phase in the 7xxx series alloys is eta' phase, the Zn/Mg atomic ratio in the precipitated phase is 1-2, and a lower Mg content or a higher Mg content is not good for the overall performance of the alloy.
The physical and chemical properties of Zr and Er are similar, and the Zr and the Er which are compounded and added into the aluminum alloy can be mutually substituted to form L12Structural Al3(ZrxEr1-x) Composite particles. After the temperature is kept for a period of time at a proper temperature, Er with a higher diffusion rate is dissolved first to precipitate Al3Er particles promote Zr with slow diffusion rate to be enriched in Al3The outer layer of Er particles forms a large amount of L which is dispersed and distributed, is coherent with the matrix12Structured, nanoscale spherical Al3(Er, Zr) composite particles with suppression of Al3The Er particles are coarsened, the grain boundary can be pinned, the recrystallization of crystal grains is inhibited, and the corrosion resistance of the material can be improved. However, the excessive addition of Er element is not favorable for the toughness of the material. In comparative example 2, Er was increased to 0.35%, and this time, a large amount of coarse Al was precipitated in the as-cast structure of the alloy3The Er phase is precipitated in the structure and is left in the final material structure, which is not beneficial to the toughness of the material.
The invention comprehensively considers the comprehensive matching influence of alloy components on the structure, the strength, the toughness and the corrosion performance. The total amount of main alloy element components Zn + Mg + Cu is optimized and adjusted, and the Zn/Mg ratio and the Cu/Mg ratio are controlled at the same time, so that the Zn, Mg and Cu elements in the matrix are promoted to exist in the matrix in a precipitated phase mode to the maximum extent; meanwhile, the trace elements such as Ti, Mn, Cr and the like are properly added, and the composite strengthening effects such as solid solution strengthening, precipitation strengthening, grain refining and the like are fully exerted. By controlling the composition, the optimal adjustment of the microscopic groupThe composition of precipitated phase in the weave ensures the strength of the material and simultaneously considers the toughness, especially the corrosion resistance. Adds a trace rare earth Er element, coordinates the characteristics of Er and Zr microalloying and promotes Al3The (Zr, Er) phase is dispersed and separated finely, the spacing between non-precipitated strips of the grain boundary is reduced, and simultaneously, as shown in figure 2, the Al is effectively improved3The precipitation number density of the (Zr, Er) phase finally effectively improves the corrosion resistance and the toughness of the alloy. The invention adopts the slow heating multi-stage soaking treatment and the rapid cooling process in the process to promote the pre-nucleation phase Al3Er phase is precipitated in the process of slow temperature rise and is used as a prefabricated nucleation point to promote disperse phase Al3The (Zr, Er) phase is dispersed and precipitated uniformly, the non-precipitation zone spacing of the crystal boundary is effectively reduced, and the energy consumption is significant for improving the toughness of the alloy and improving the stress corrosion performance. The invention reasonably selects high-temperature solid solution heating and faster cooling rate in process, effectively improves the purity of the final microstructure of the material, and inhibits the precipitation of a second phase in the quenching process. Meanwhile, the proper pre-stretching and two-stage aging process is optimized and matched, so that the alloy in-crystal phase and the grain boundary phase are well matched, and the comprehensive matching of the strength, toughness and corrosion resistance of the bar and the strip plate is finally ensured.
The above is only a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.
Claims (11)
1. The high-toughness corrosion-resistant 7xxx series aluminum alloy is characterized in that the aluminum alloy comprises the following components in percentage by weight: 8.8 to 10 percent of Zn, 2.0 to 3.0 percent of Mg, 1.0 to 2.5 percent of Cu, 0.05 to 0.2 percent of Zr, 0.01 to 0.15 percent of Ti, less than or equal to 0.1 percent of Mn, less than or equal to 0.2 percent of Fe, less than or equal to 0.1 percent of Si, less than or equal to 0.15 percent of the total content of other impurity elements and the balance of Al; wherein Zn + Mg + Cu is more than or equal to 12 percent and less than or equal to 15.5 percent, Zn/Mg is more than or equal to 3 and less than or equal to 5 percent, and Cu/Mg is more than or equal to 0.3 and less than or equal to 1.
2. The high toughness, corrosion resistant 7 xxx-series aluminum alloy of claim 1, further comprising 0.01 to 0.2 wt.% Er.
3. The high toughness, corrosion resistant 7 xxx-series aluminum alloy of claim 1, wherein the aluminum alloy comprises, in weight percent: 1.0 to 2.0 percent of Cu, 0.08 to 0.15 percent of Zr, more than or equal to 12 percent and less than or equal to 15 percent of Zn + Mg + Cu, more than or equal to 3 percent and less than or equal to 4.5 percent of Zn/Mg, and more than or equal to 0.4 and less than or equal to 1 percent of Cu/Mg.
4. The high toughness, corrosion resistant 7 xxx-series aluminum alloy of claim 2, wherein the aluminum alloy has the following composition and weight percent: 1.5 to 2.0 percent of Cu, 0.08 to 0.15 percent of Zr, more than or equal to 12 percent and less than or equal to 15 percent of Zn + Mg + Cu, more than or equal to 3 percent and less than or equal to 4.5 percent of Zn/Mg, and more than or equal to 0.4 and less than or equal to 1 percent of Cu/Mg.
5. A method of processing a high toughness, corrosion resistant 7 xxx-series aluminum alloy as defined in any of claims 1-4, comprising the steps of:
step (1): mixing and smelting according to the components and the mass percentage, and obtaining an ingot by adopting semi-continuous casting after smelting;
step (2): carrying out multistage homogenization treatment on the ingot obtained in the step (1), wherein the multistage homogenization treatment process comprises the following steps: heating the cast ingot from room temperature to 450 ℃ at a speed of 10-50 ℃/h, and preserving heat for 5-10 h; heating to 465-480 ℃ at the speed of 1-30 ℃/h, preserving heat for 10-60h, and then cooling at the cooling rate of more than or equal to 30 ℃/h;
and (3): extruding the ingot obtained in the step (2) to obtain a bar;
and (4): carrying out solid solution treatment on the extruded bar, wherein the solid solution temperature is 468-480 ℃, and the heat preservation time is 0.5-20 h; then water quenching is carried out;
and (5): and performing pre-stretching and aging heat treatment on the bar subjected to the solution treatment.
6. The processing method of the high-toughness corrosion-resistant 7xxx series aluminum alloy according to claim 5, wherein the multi-stage homogenization treatment process in the step (2) is as follows: heating the cast ingot from room temperature to 350 ℃ at the speed of 10-50 ℃/h, and preserving heat for 1-10 h; then heating to 350-; and then heating to 465-480 ℃ at the speed of 1-30 ℃/h, preserving the heat for 10-60h, and then cooling at the cooling rate of more than or equal to 30 ℃/h.
7. The processing method of the high strength and toughness corrosion-resistant 7xxx series aluminum alloy as claimed in claim 5, wherein the extrusion temperature in the step (3) is 400-450 ℃; the extrusion outlet speed is 0.1-4 mm/s; the temperature of an extrusion outlet is 350-430 ℃, and the extrusion ratio is more than or equal to 8.
8. The processing method of the high strength and toughness corrosion-resistant 7xxx series aluminum alloy as claimed in claim 5, wherein the extrusion temperature in the step (3) is 400-440 ℃; the extrusion outlet speed is 0.1-1mm/s, and the extrusion outlet temperature is 380-430 ℃.
9. The processing method of the high-toughness corrosion-resistant 7xxx series aluminum alloy as claimed in claim 5, wherein the solid solution temperature in the step (4) is 465-475 ℃, and the holding time is 0.5-10 h.
10. The processing method of the high-toughness corrosion-resistant 7 xxx-series aluminum alloy as claimed in claim 5, wherein the aging temperature in the step (5) is 105-120 ℃, and the heat preservation time is 16-36 h.
11. The method of processing a high toughness corrosion resistant 7 xxx-series aluminum alloy as claimed in claim 5, wherein the amount of pre-stretching in step (5) is 0.5-3%.
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