CN118166247A - Copper-free ultrahigh-strength aluminum alloy and preparation method thereof - Google Patents
Copper-free ultrahigh-strength aluminum alloy and preparation method thereof Download PDFInfo
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- QQHSIRTYSFLSRM-UHFFFAOYSA-N alumanylidynechromium Chemical compound [Al].[Cr] QQHSIRTYSFLSRM-UHFFFAOYSA-N 0.000 claims description 10
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
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Abstract
A copper-free ultra-high strength aluminum alloy and a preparation method thereof belong to the field of aluminum alloy design and processing. The alloy comprises the following components: 8.00 to 12.00 percent of Zn, 2.00 to 3.00 percent of Mg, 0.05 to 0.15 percent of Zr, less than 0.15 percent of Cr, less than 0.10 percent of T i, less than 0.15 percent of Cu, less than 0.05 percent of the total sum of impurity elements such as Fe, si and the like, and the balance of A l. The preparation and processing technology comprises the steps of alloy batching and smelting, homogenization treatment, hot extrusion or hot rolling, solution treatment, aging treatment and the like, so that the tensile strength UTS of the aluminum alloy is more than 700MPa, the elongation delta after fracture is more than 8%, the peeling corrosion resistance grade is EA grade, and the aluminum alloy has excellent surface finish. The alloy has high zinc and magnesium, less copper, and extremely high strength, almost no micron-sized second phase and good oxidation coloring effect and corrosion resistance by strictly controlling micro alloying elements and impurity elements. The invention has simple process and low cost, is suitable for large-scale industrial production, and can meet the requirements of the fields of consumer electronics, transportation, aerospace and the like on the high-performance aluminum alloy.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy design and processing, and particularly relates to a novel ultra-high-strength aluminum alloy free of copper elements and a preparation method thereof, which meet the requirements of consumer electronics, transportation and other fields on high surface processing and treatment performance of the high-strength aluminum alloy.
Background
The aluminum alloy has the advantages of high specific strength, corrosion resistance, easy processing, special metallic luster and the like, and is widely applied to the fields of consumer electronics, transportation, aerospace and the like. Among them, the housing, frame, heat sink, etc. of portable consumer electronics products are in the form of a rapid growth with high performance aluminum alloys. The commonly used 6061 and 6063 series aluminum alloy has excellent corrosion resistance and oxidation coloring effect, but has the problems of low strength (< 300 MPa), insufficient precision machining capability and the like. Along with the great standardization and thinning of consumer electronics products, development and application of high-strength Al-Zn-Mg- (Cu) (7 xxx series) aluminum alloy products are increasingly emphasized, such as 7003 and 7N01 aluminum alloys, the tensile strength of the aluminum alloy is 300-400 MPa, and meanwhile, the aluminum alloy has good surface processing, oxidation coloring effect and corrosion resistance. However, compared with stainless steel (tensile strength 600-800 MPa), the strength levels of 7003 and 7N01 aluminum alloys still have a large difference. Therefore, the development of the surface finishing capability, the surface treatment capability such as anodic oxidation and the like and the corrosion resistance are equivalent to those of the existing 7003 and 7N01 alloys, the strength is greatly improved, the ultra-high strength aluminum alloy with the strength level of stainless steel can be achieved, and the ultra-high strength aluminum alloy is a great demand for realizing the weight reduction of consumer electronics and high-end transportation equipment.
The composition optimization design is a very important means for improving the performance of the aluminum alloy. 7003. The content of Zn in the aluminum alloy such as 7N01 is 4.0% -6.5%, the content of Mg is 0.5% -2.0% and the content of Cu is less than 0.2%. The total content of main elements such as Zn, mg and the like is further improved, and a proper amount of microalloying elements are added, so that the density of precipitated phases in a crystal is increased, the grain size is refined, and the strength of the Al-Zn-Mg- (Cu) aluminum alloy can be improved. However, when the content of the main element exceeds the maximum solid solubility of the elements in the alloy or the matching among the main elements is unreasonable, one of the elements generates excessive, a large amount of micron-sized coarse second phases which cannot be eliminated by heat treatment such as homogenization, solid solution and the like are generated, and the toughness, the product surface processing and the corrosion resistance of the alloy are obviously deteriorated, so that the comprehensive performance of the alloy and the service performance of products/equipment are damaged. Therefore, reasonably matching the main element components of the complex alloy, adding proper micro-alloy elements, and inhibiting or eliminating the formation of micron-sized coarse second phases is a long-standing significant challenge for the design of complex-component high-performance aluminum alloys. On the other hand, the optimization of the solid solution aging treatment parameters of the complex component precipitation strengthening alloy is the key to eliminating the coarse primary phase, obtaining the precipitation phase with high density and fine uniform distribution, improving the comprehensive performance of the alloy, and improving the surface treatment capability and corrosion resistance of the finished product such as the smooth surface degree, the anodic oxidation and the like.
However, the high-strength aluminum alloy typically represented by A l-Zn-Mg- (Cu) system has the problems of complex composition, long preparation process flow, various target properties, difficult construction of composition-process-structure-property intrinsic relation and the like, and the efficiency of developing the novel high-performance aluminum alloy is low by searching possible compositions and process schemes in huge composition and process space by using the conventional strategy of experience and trial and error. With the development of a new paradigm of data-driven research, the adoption of a machine learning combined with theoretical calculation method is likely to break through the problems.
Disclosure of Invention
Aiming at the problems that the strength, surface smoothness, oxidation coloring effect, corrosion resistance and other performances of the conventional industrially produced A l-Zn-Mg- (Cu) alloy are difficult to meet the requirements of the consumer electronics and high-end transportation equipment field on aluminum alloy materials, the invention develops a novel copper-free ultrahigh-strength aluminum alloy A l-Zn-Mg-Zr- (Cr) - (T i), which is characterized in that the mass fraction (wt%) of novel alloy elements is as follows: 8.00 to 12.00 percent of Zn, 2.00 to 3.00 percent of Mg, 0.05 to 0.15 percent of Zr, less than 0.15 percent of Cr, less than 0.10 percent of T i, less than 0.15 percent of Cu, less than 0.05 percent of the total sum of impurity elements such as Fe, si and the like, and the balance of A l.
Compared with 7003 and 7N01 alloys, the Zn element content of the copper-free ultrahigh-strength aluminum alloy is obviously improved from 4.40 to 6.50 percent to 8.00 to 12.00 percent; the content of Mg is greatly increased from 0.50 to 2.00 percent to 2.00 to 3.00 percent; contributing to the increase in alloy strength. The microalloying elements Zr, cr, T i and the impurity elements Fe, S i are more tightly controlled so that the second phase in the micrometer scale is almost completely absent from the alloy.
Preferred composition mass fraction (wt%) of further alloying elements: 9.00% -11.00% of Zn, 2.40% -2.80% of Mg, 0.08% -0.13% of Zr, 0.10% of Cr, 0.07% of T i, 0.10% of Cu, 0.05% of the total sum of impurity elements such as Fe, si and the like, and the balance of A l.
The invention provides a preparation process matching the characteristics of the aluminum alloy components, which comprises the following steps:
1) High-purity aluminum, industrial pure zinc, industrial pure magnesium, aluminum-chromium intermediate alloy, aluminum-zirconium intermediate alloy and aluminum-titanium intermediate alloy are used as raw materials: wherein the purity of the high-purity aluminum is more than or equal to 99.95wt%, the purity of the industrial pure zinc is more than or equal to 99.99wt%, the purity of the industrial pure magnesium is more than or equal to 99.99wt%, the chromium content in the aluminum-chromium intermediate alloy is more than or equal to 5wt%, the zirconium content in the aluminum-zirconium intermediate alloy is more than or equal to 5wt%, and the titanium content in the aluminum-titanium intermediate alloy is more than or equal to 10wt%;
2) Weighing alloy raw materials according to alloy components, smelting, purifying a melt, and performing die casting or semi-continuous casting, wherein the smelting temperature is controlled to be 700-800 ℃;
3) Homogenizing the ingot obtained in step 2): heating to 380-420 ℃, preserving heat for 10-30 h, heating to 460-475 ℃, preserving heat for 10-30 h, discharging from a furnace, and air cooling to room temperature;
4) Performing hot extrusion or hot rolling processing on the cast ingot subjected to the homogenization treatment in the step 3): the heating temperature of the aluminum alloy cast ingot is 380-420 ℃, and the heating time is 2-4 hours; the extrusion ratio is 7-50 during extrusion, and the total deformation of hot rolling is 50-90% during hot rolling;
5) And (3) carrying out three-stage solid solution treatment on the blank subjected to the heat treatment in the step (4): heating to 430-450 ℃ and preserving heat for 1h; then heating to 465-475 ℃, and preserving heat for 1h; finally, heating to 475-485 ℃, preserving heat for 0.5h, and then quenching in room temperature water;
6) Single-stage aging treatment is carried out on the blank subjected to the solution treatment in the step 5): heating the blank to 110-130 ℃, and preserving heat for 15-30 h to obtain the final aluminum product.
Further, the final aluminum material has the following structure characteristics: the surface is smooth, the volume fraction of the micron-sized second phase is less than 0.001%, the grain size is 6-15 mu m, the alloy contains nano-sized dispersed phases rich in Zr and other elements, the size range is 20-300 nm as shown in figure 2, and meanwhile, the matrix contains nano-sized precipitated phases such as eta' and GP zone with the volume fraction of more than 8%, and the size range is 2-10 nm as shown in figure 3.
Further, the performance characteristics of the final aluminum material are as follows: the tensile strength UTS is more than 700MPa, the elongation after break delta is more than 8%, the peeling corrosion resistance grade is EA grade, and the strength is remarkably improved while the excellent corrosion resistance is maintained.
The principle of the invention is as follows:
1. From the component point of view, the component of the invention is different from the prior art in that the invention greatly improves the Zn and Mg contents, wherein the effect of improving the Zn and Mg contents is as follows: zn and Mg have larger solid solubility in an aluminum matrix, and the volume fraction of eta' phase, GP zone and other precipitated phases in the alloy can be improved under the condition that micron-sized second phases are not generated by increasing the content of Zn and Mg. 7003. The volume fraction of the precipitated phase in the 7N01 alloy is about 4%, and the volume fraction of the precipitated phase in the alloy is about 8%, so that a stronger ageing strengthening effect can be achieved, and the alloy strength is remarkably improved; the alloy contains Zr, cr, ti and other elements, and forms nano-scale dispersed phases of Al 3 Zr, al 18(Cr,Ti)2Mg3 and the like under the condition of ensuring that a micro-scale second phase is not generated, thereby playing roles in dispersion strengthening, refining grains and preventing corrosion expansion, and further improving the mechanical property and corrosion resistance of the alloy.
2. From the manufacturing process point of view, the invention adopts a three-stage solid solution treatment system, and compared with a single-stage solid solution system, the three-stage solid solution system can enable the temperature to exceed the multiphase eutectic temperature without generating an overburning structure, improve the dissolution degree of the residual soluble second phase, simultaneously ensure lower recrystallization degree, increase the supersaturation degree of the solid solution after quenching, and improve the aging strengthening effect of the alloy, thereby improving the mechanical property and the corrosion resistance of the alloy.
The invention collects the reported aluminum alloy composition-process-performance data, adopts a machine learning strategy and thermodynamic calculation to realize the rapid design of alloy composition and synchronous prediction of structure-performance, efficiently screens out the composition design and preparation process scheme without micron-sized coarse second phase structure after aging treatment and greatly improves the mechanical performance, and the invention meets the harsh requirements of consumer electronics and other high-end manufacturing of novel aluminum alloy.
Compared with the common Al-Zn-Mg-Cu alloy, the invention can cause the surface to appear red and other variegates after anodic oxidation due to the existence of Cu in A l-Zn-Mg-Cu alloy and influence the surface quality, and in order to overcome the problem, the invention can replace Cu in the Al-Zn-Mg-Cu alloy by greatly improving Zn-Mg in the Al-Zn-Mg- (Cu) alloy and can also improve the mechanical property and corrosion resistance of the alloy, while the residual Cu in the invention is only unavoidable impurities brought by a return material in the smelting process and does not influence the performance of the Al-Zn-Mg- (Cu) alloy.
The novel aluminum alloy has almost no micron-sized second phase after solution-aging treatment, which greatly reduces sites for generating pitting and voids, as shown in fig. 1. The alloy is produced by adopting a conventional aluminum alloy process, the cost is low, large-scale industrial production can be carried out, the tensile strength UTS of a final product is more than 700MPa, the elongation delta after fracture is more than 8%, and the peeling corrosion resistance grade is EA grade. The alloy strength is obviously improved, and meanwhile, the excellent surface finish, oxidation coloring effect and excellent corrosion resistance are achieved.
Compared with the prior Al-Zn-Mg- (Cu) aluminum alloy, the invention has the following advantages:
(1) The copper-free ultrahigh-strength aluminum alloy prepared by the method has tensile strength UTS of more than 700MPa, and strength of more than one time higher than 7003 and 7N01 aluminum alloy, and reaches the level of stainless steel. The ultra-high strength is of great significance for the weight reduction of consumer electronics and high-end transportation equipment.
(2) The copper-free ultrahigh-strength aluminum alloy prepared by the method strictly controls microalloying elements and impurity elements, so that micron-sized second phases almost do not exist in the alloy, smooth surfaces, excellent oxidation coloring effect and corrosion resistance are ensured, and the level is equivalent to 7003 and 7N01 aluminum alloy.
(3) The invention adopts conventional casting (die casting or semi-continuous casting), homogenization, hot extrusion or hot rolling processing, solution treatment and aging treatment, is suitable for large-scale industrial production, and is beneficial to realizing low-cost production.
Drawings
FIG. 1 shows the micron-sized second phase distribution of copper-free ultrahigh-strength Al-Zn-Mg- (Cu) aluminum alloy,
FIG. 2 shows the nano-scale dispersed phase distribution of copper-free ultrahigh-strength Al-Zn-Mg- (Cu) aluminum alloy,
FIG. 3 shows the nano-scale precipitated phase distribution of a copper-free ultrahigh-strength Al-Zn-Mg- (Cu) aluminum alloy.
Detailed Description
In order to more clearly demonstrate the technical scheme and advantages of the novel alloy, the invention is further described in detail below with reference to examples.
Example 1: the embodiment provides a copper-free ultrahigh-strength aluminum alloy and a preparation method thereof, wherein the components (wt%) of the aluminum alloy are A l-Zn-Mg- (Cu) system: 10.04% Zn, 2.47% Mg, 0.09% Zr, 0.10% Cr, 0.064% Ti, 0.06% Cu, 0.01% Fe, 0.017% Si and A l% balance.
1) High-purity aluminum, industrial pure zinc, industrial pure magnesium, aluminum-chromium intermediate alloy, aluminum-zirconium intermediate alloy and aluminum-titanium intermediate alloy are used as raw materials: wherein the purity of the high-purity aluminum is more than or equal to 99.95wt%, the purity of the industrial pure zinc is more than or equal to 99.99wt%, the purity of the industrial pure magnesium is more than or equal to 99.99wt%, the chromium content in the aluminum-chromium intermediate alloy is more than or equal to 5wt%, the zirconium content in the aluminum-zirconium intermediate alloy is more than or equal to 5wt%, and the titanium content in the aluminum-titanium intermediate alloy is more than or equal to 10wt%;
2) Weighing alloy raw materials according to alloy components, smelting, purifying the melt, die casting, controlling the smelting temperature to 711-742 ℃, and refining the melt by adopting N 2;
3) Homogenizing the ingot obtained in step 2): heating to 400 ℃, preserving heat for 23 hours, heating to 470 ℃, preserving heat for 24 hours, discharging from the furnace, and air cooling to room temperature;
4) Carrying out hot extrusion on the cast ingot subjected to the homogenization treatment in the step 3): during extrusion, the temperature of the aluminum alloy is 395-415 ℃, and the heating time is 2 hours; the temperature of the extrusion cylinder, the die and the cushion is 415-425 ℃, the heating time is 12h, and the extrusion ratio is 9;
5) Performing three-stage solid solution treatment on the blank subjected to the hot extrusion treatment in the step 4): heating to 450 ℃, and preserving heat for 1h; then heating to 470 ℃, and preserving heat for 1h; finally, heating to 480 ℃, preserving heat for 1.5h, and then quenching in room temperature water;
6) Aging the blank subjected to the solution treatment in the step 5): heating the blank to 120 ℃, and preserving heat for 24 hours to obtain the final aluminum product.
The final aluminum material has the following structural characteristics: the volume fraction of the second phase with smooth surface and micron level is less than 0.001%; the grain size is 6.9+/-10.0 mu m; the alloy has A l 3 Zr and A l 18(Cr,T i)2Mg3 nanometer disperse phase, the size range is 20-300 nm; meanwhile, nanometer precipitated phases such as eta' and GP regions with volume fraction of about 8.8% exist in the matrix, and the size range is 2-10 nm.
Final properties of final aluminum material: tensile strength uts=765±3MPa, yield strength σ 0.2 =745±3MPa, elongation after break δ=8.4±0.9%, and resistance to peeling corrosion grade is EA grade.
Example 2: the embodiment provides a copper-free ultrahigh-strength aluminum alloy and a preparation method thereof, wherein the Al-Zn-Mg- (Cu) aluminum alloy comprises the following components in percentage by weight: 9.45% Zn, 2.76% Mg, 0.12% Zr, 0.002% Cr, 0.055% Ti, 0.01% Cu, 0.01% Fe, 0.014% Si, and the balance Al.
1) High-purity aluminum, industrial pure zinc, industrial pure magnesium, aluminum-chromium intermediate alloy, aluminum-zirconium intermediate alloy and aluminum-titanium intermediate alloy are used as raw materials: wherein the purity of the high-purity aluminum is more than or equal to 99.95wt%, the purity of the industrial pure zinc is more than or equal to 99.99wt%, the purity of the industrial pure magnesium is more than or equal to 99.99wt%, the chromium content in the aluminum-chromium intermediate alloy is more than or equal to 5wt%, the zirconium content in the aluminum-zirconium intermediate alloy is more than or equal to 5wt%, and the titanium content in the aluminum-titanium intermediate alloy is more than or equal to 10wt%;
2) Weighing alloy raw materials according to alloy components, smelting, purifying the melt, die casting, controlling the smelting temperature at 708-738 ℃, and refining the melt by adopting N 2;
3) Homogenizing the ingot obtained in step 2): heating to 400 ℃, preserving heat for 22 hours, heating to 472 ℃, preserving heat for 24 hours, discharging from the furnace, and air cooling to room temperature;
4) Carrying out hot extrusion on the cast ingot subjected to the homogenization treatment in the step 3): during extrusion, the temperature of the aluminum alloy is 405-420 ℃, and the heating time is 2 hours; the temperature of the extrusion cylinder, the die and the cushion is 415-430 ℃, the heating time is 12h, and the extrusion ratio is 9;
5) And 3) carrying out three-stage solid solution treatment on the blank subjected to the extrusion treatment in the step 4): heating to 450 ℃, and preserving heat for 1h; then heating to 470 ℃, and preserving heat for 1h; finally, heating to 480 ℃, preserving heat for 1.5h, and then quenching in room temperature water;
6) Aging the blank subjected to the solution treatment in the step 5): heating the blank to 125 ℃, and preserving heat for 23 hours to obtain the final aluminum product.
Texture characteristics of final aluminum material: the volume fraction of the second phase with smooth surface and micron level is less than 0.001%; the grain size is 6.8+/-9.3 mu m; the alloy contains Al 3 (Zr, ti) nano-scale disperse phase, the size range is 20-50 nm; meanwhile, nanometer precipitated phases such as eta' and GP regions with volume fraction of 8.4% exist in the matrix, and the size range is 2-10 nm.
Final properties of final aluminum material: tensile strength uts=749±10MPa, yield strength σ 0.2 =747±12MPa, elongation after break δ=8.0±0.4%, and peel corrosion resistance rating is EA grade.
Example 3: the embodiment provides a copper-free ultrahigh-strength aluminum alloy and a preparation method thereof, wherein the components (wt%) of the aluminum alloy are A l-Zn-Mg- (Cu) system: 10.90% Zn, 2.42% Mg, 0.12% Zr, 0.061% Cr, 0.053% T i% Cu, 0.04% Fe, 0.011% Si, and A l% balance.
1) High-purity aluminum, industrial pure zinc, industrial pure magnesium, aluminum-chromium intermediate alloy, aluminum-zirconium intermediate alloy and aluminum-titanium intermediate alloy are used as raw materials: wherein the purity of the high-purity aluminum is more than or equal to 99.95wt%, the purity of the industrial pure zinc is more than or equal to 99.99wt%, the purity of the industrial pure magnesium is more than or equal to 99.99wt%, the chromium content in the aluminum-chromium intermediate alloy is more than or equal to 5wt%, the zirconium content in the aluminum-zirconium intermediate alloy is more than or equal to 5wt%, and the titanium content in the aluminum-titanium intermediate alloy is more than or equal to 10wt%;
2) Weighing alloy raw materials according to alloy components, smelting, purifying the melt, and performing semi-continuous casting, wherein the smelting temperature is controlled to be 704-740 ℃;
3) Homogenizing the ingot obtained in step 2): heating to 410 ℃, preserving heat for 20 hours, heating to 473 ℃, preserving heat for 26 hours, discharging from the furnace, and air-cooling to room temperature;
4) Carrying out hot rolling treatment on the cast ingot subjected to the homogenization treatment in the step 3): during hot rolling, the temperature of the aluminum alloy is 380-410 ℃, and the rolling deformation is 90%;
5) Performing three-stage solid solution treatment on the blank subjected to the hot extrusion treatment in the step 4): firstly, heating to 440 ℃, and preserving heat for 1h; then heating to 466 ℃, and preserving heat for 1h; finally, heating to 478 ℃, preserving heat for 1.5h, and then quenching in water at room temperature;
6) Aging the blank subjected to the solution treatment in the step 5): heating the blank to 120 ℃, and preserving heat for 24 hours to obtain the final aluminum product.
Texture characteristics of final aluminum material: the volume fraction of the second phase with smooth surface and micron level is less than 0.001%; the grain size is 8.5+/-6.6 mu m; a l 3 Zr and A l 18(Cr,T i)2Mg3 nanometer level disperse phase exist in the alloy, and the size range is 20-300 nm; meanwhile, nanometer precipitated phases such as eta' and GP regions with volume fraction of 8.9% exist in the matrix, and the size range is 2-10 nm.
Final properties of final aluminum material: tensile strength uts=708±7MPa, yield strength σ 0.2 =686±10MPa, elongation after break δ=8.7±0.1%, and resistance to peeling corrosion grade is EA grade.
Claims (5)
1. The copper-free ultrahigh-strength aluminum alloy is characterized by comprising the following alloy elements in percentage by mass (wt%): 8.00 to 12.00 percent of Zn, 2.00 to 3.00 percent of Mg, 0.05 to 0.15 percent of Zr, less than 0.15 percent of Cr,
Ti <0.10%, cu <0.15%, the sum of Fe, si impurity elements <0.05%, and the balance Al.
2. Copper-free ultra-high strength aluminium alloy according to claim 1, characterized in that the alloy composition mass fraction (wt%) is preferred: 9.00% -11.00% of Zn, 2.40% -2.80% of Mg, 0.08% -0.13% of Zr, less than 0.10% of Cr, less than 0.07% of Ti, less than 0.10% of Cu, less than 0.05% of Fe, the total of Si impurity elements and the balance of Al.
3. The process for preparing the copper-free ultrahigh-strength aluminum alloy according to claim 1 or 2, which is characterized by comprising the following steps:
1) High-purity aluminum, industrial pure zinc, industrial pure magnesium, aluminum-chromium intermediate alloy, aluminum-zirconium intermediate alloy and aluminum-titanium intermediate alloy are used as raw materials: wherein the purity of the high-purity aluminum is more than or equal to 99.95wt%, the purity of the industrial pure zinc is more than or equal to 99.99wt%, the purity of the industrial pure magnesium is more than or equal to 99.99wt%, the chromium content in the aluminum-chromium intermediate alloy is more than or equal to 5wt%, the zirconium content in the aluminum-zirconium intermediate alloy is more than or equal to 5wt%, and the titanium content in the aluminum-titanium intermediate alloy is more than or equal to 10wt%;
2) Weighing alloy raw materials according to alloy components, smelting, purifying a melt, and performing die casting or semi-continuous casting, wherein the smelting temperature is controlled to be 700-800 ℃;
3) Homogenizing the ingot obtained in step 2): heating to 380-420 ℃, preserving heat for 10-30 h, heating to 460-475 ℃, preserving heat for 10-30 h, discharging from a furnace, and air cooling to room temperature;
4) Performing hot extrusion or hot rolling processing on the cast ingot subjected to the homogenization treatment in the step 3): the heating temperature of the aluminum alloy cast ingot is 380-420 ℃, and the heating time is 2-4 hours; the extrusion ratio is 7-50 during extrusion, and the total deformation of hot rolling is 50-90% during hot rolling;
5) And (3) carrying out three-stage solid solution treatment on the blank subjected to the heat treatment in the step (4): heating to 430-450 ℃ and preserving heat for 1h; then heating to 465-475 ℃, and preserving heat for 1h; finally, heating to 475-485 ℃, preserving heat for 1.5h, and then quenching in room temperature water;
6) Single-stage aging treatment is carried out on the blank subjected to the solution treatment in the step 5): heating the blank to 110-130 ℃, and preserving heat for 15-30 h to obtain the final aluminum product.
4. The process for producing a copper-free ultrahigh-strength aluminum alloy according to claim 3, wherein the texture of the final aluminum material obtained is characterized by a smooth surface after polishing, no defects, black lumps and high and low undulations; the volume fraction of the micron-sized second phase is less than 0.001%; the grain size is 6-15 mu m; the alloy contains a nano-scale disperse phase rich in Zr element, and the size range is 20-300 nm; meanwhile, the matrix has eta' with volume fraction more than 8% and GP region nano-scale precipitated phases with size ranging from 2 nm to 10nm.
5. The process for preparing a copper-free ultra-high strength aluminum alloy according to claim 4, wherein the final aluminum material has tensile strength UTS of >700MPa, elongation after break delta of >8%, and peeling corrosion resistance of EA grade.
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