High-strength super-tough recycled aluminum alloy, preparation method and aluminum alloy profile

Abstract

The invention discloses a high-strength super-tough recycled aluminum alloy, a preparation method and an aluminum alloy profile, and relates to the technical field of aluminum alloys. The high-strength super-tough recycled aluminum alloy is prepared from the following components in percentage by weight: 3-5wt% of Si; 2.5 to 3 weight percent of Cu; 0.1 to 0.5 wt% of Mg; mn is 0.02 to 0.04 wt%; the content of Cr is 0.02 to 0.04 percent by weight; 0.4 to 0.5 wt% of Ti; 0.01 to 0.02 wt% of Sr; less than 0.1 wt% of Fe and impurities; and the balance of Al. The invention further provides a preparation method of the aluminum alloy and an aluminum alloy profile. By changing the formula of the aluminum alloy, increasing the adding amount of elements such as Cu and Ti and reducing the adding amount of elements such as Mn and Cr, the aluminum alloy prepared by taking the recycled aluminum alloy as the main material is high in strength and good in toughness.

Description

Technical Field

[0001] The present application relates to the technical field of aluminum alloys, and in particular to a high-strength and ultra-tough recycled aluminum alloy, a preparation method, and an aluminum alloy profile. Background Art

[0002] Aluminum alloys are widely used in vehicles such as cars, airplanes and trains; nearly half of all cars use aluminum alloy wheels. Therefore, there are a large number of scrap aluminum wheels on the market. Compared with new aluminum alloys, melting recycled aluminum alloys only requires 5% of the energy consumption. Therefore, it is very necessary to use recycled aluminum alloy wheels and other scrap aluminum to produce high-quality materials and industrial products.

[0003] Generally speaking, after aluminum alloy is recycled and reused, the strength and toughness of the aluminum alloy prepared are relatively low. Therefore, it is necessary to improve the aluminum alloy formula and preparation method after aluminum alloy is recycled to obtain an aluminum alloy with recycled aluminum alloy as the main material and high strength and good toughness. Summary of the invention

[0004] In order to solve at least one of the above technical problems, an aluminum alloy with high strength and good toughness is developed with recycled aluminum alloy as the main material. The present application provides a high-strength and super-tough recycled aluminum alloy, a preparation method and an aluminum alloy profile.

[0005] On the one hand, the present application provides a high-strength and ultra-tough recycled aluminum alloy, which is made of the following components by weight percentage:

[0006] Si 3-5wt%;

[0007] Cu 2.5~3wt%;

[0008] Mg 0.1~0.5wt%;

[0009] Mn 0.02~0.04wt%;

[0010] Cr 0.02~0.04wt%;

[0011] Ti 0.4~0.5wt%;

[0012] Sr 0.01~0.02wt%;

[0013] Fe and impurities are less than 0.1wt%;

[0014] Al Residue.

[0015] By adopting the above technical solution, it is possible to use the recycled aluminum alloy material as the main material to obtain an aluminum alloy with high strength and high toughness.

[0016] Optionally, it is made of the following components by weight percentage:

[0017] Si 3.8~4.6wt%;

[0018] Cu 2.6~2.8wt%;

[0019] Mg 0.15~0.5wt%;

[0020] Mn 0.028~0.036wt%;

[0021] Cr 0.024~0.032wt%;

[0022] Ti 0.44~0.48wt%;

[0023] Sr 0.012~0.016wt%;

[0024] Fe and impurities are less than 0.1wt%;

[0025] Al Residue.

[0026] By adopting the above technical solution, the strength and toughness of the aluminum alloy obtained with the recycled aluminum alloy material as the main material are further improved.

[0027] In a second aspect, the present application provides a method for preparing the above-mentioned high-strength and ultra-tough recycled aluminum alloy, comprising the following steps:

[0028] S1. Recovery and pretreatment

[0029] Collect aluminum alloy scrap from different sources, sort the collected scrap, remove surface impurities, and crush the sorted scrap into small pieces or powder;

[0030] S2. Smelting and purification

[0031] The treated aluminum scrap is placed in a furnace and heated to above the melting point to melt it. In the molten state, chemical reagents are used to remove non-metallic impurities therein, and inert gas is blown into the melt to remove hydrogen bubbles and other gas inclusions;

[0032] S3. Alloying

[0033] According to the specific composition requirements of the required alloy, an appropriate amount of alloying elements is added during the smelting process so that the added alloying elements can be fully diffused into the aluminum alloy matrix;

[0034] S4, forming and heat treatment

[0035] The molten aluminum alloy is cast into a shape, and then solution treated and aging hardened;

[0036] S5. Post-processing

[0037] Machining is performed according to the size and shape requirements of the final product, followed by anodizing and electroplating.

[0038] By combining the formula of the present application with the above-mentioned preparation method, the aluminum alloy prepared with recycled aluminum alloy as the main material has high strength and good toughness.

[0039] Optionally, in the S4, forming and heat treatment, the solution treatment is: heating the casting to a certain temperature and then rapidly cooling it to dissolve the alloy elements in the matrix.

[0040] By adopting the above technical solution, the aluminum alloy prepared with recycled aluminum alloy as the main material has high strength and good toughness.

[0041] Optionally, in the S4, forming and heat treatment, aging hardening is: keeping the solution treated material at a relatively low temperature for a period of time to promote the formation of precipitation strengthening phase.

[0042] By adopting the above technical solution, the aluminum alloy prepared with recycled aluminum alloy as the main material has high strength and good toughness.

[0043] In a third aspect, the present application provides an aluminum alloy profile prepared by the above-mentioned high-strength and super-tough recycled aluminum alloy.

[0044] By adopting the above technical solution, the prepared aluminum alloy profile has low cost, high strength and good toughness.

[0045] In summary, the present invention includes at least one of the following beneficial technical effects:

[0046] 1. The present application changes the aluminum alloy formula, increases the addition amount of elements such as Cu and Ti, and reduces the addition amount of elements such as Mn and Cr, so that the aluminum alloy prepared with recycled aluminum alloy as the main material has high strength and good toughness;

[0047] 2. The aluminum alloy prepared by the preparation method of the present application with recycled aluminum alloy as the main material has high strength and good toughness;

[0048] 3. The profiles prepared by the high-strength and super-tough aluminum alloy of the present application have low cost, high strength and good toughness. DETAILED DESCRIPTION

[0049] The present application is further described in detail below with reference to the embodiments. Specific embodiments

[0051] Example 1

[0052] This embodiment is used to prepare a high-strength and ultra-tough recycled aluminum alloy, and its formula is as follows:

[0053] Si 3wt%;

[0054] Cu 3wt%;

[0055] Mg 0.1wt%;

[0056] Mn 0.02wt%;

[0057] Cr 0.04wt%;

[0058] Ti 0.4wt%;

[0059] Sr 0.02wt%;

[0060] Fe and impurities 0.09wt%;

[0061] Al Residue.

[0062] The method for preparing the high-strength and ultra-tough recycled aluminum alloy of this embodiment comprises the following steps:

[0063] S1. Recovery and pretreatment

[0064] Collect aluminum alloy scrap from different sources, sort the collected scrap, remove surface impurities, and crush the sorted scrap into small pieces or powder;

[0065] S2. Smelting and purification

[0066] The treated aluminum scrap is placed in a furnace and heated to above the melting point to melt it. In the molten state, chemical reagents are used to remove non-metallic impurities therein, and inert gas is blown into the melt to remove hydrogen bubbles and other gas inclusions;

[0067] S3. Alloying

[0068] According to the specific composition requirements of the required alloy, an appropriate amount of alloying elements is added during the smelting process so that the added alloying elements can be fully diffused into the aluminum alloy matrix;

[0069] S4, forming and heat treatment

[0070] The molten aluminum alloy is cast into a shape, and then solution treated and aging hardened;

[0071] Solution treatment is to heat the casting to a certain temperature and then cool it rapidly to dissolve the alloy elements into the matrix;

[0072] Age hardening is to keep the solution treated material at a relatively low temperature for a period of time to promote the formation of precipitation strengthening phases;

[0073] S5. Post-processing

[0074] Machining is performed according to the size and shape requirements of the final product, followed by anodizing and electroplating.

[0075] Example 2

[0076] This embodiment is used to prepare a high-strength and ultra-tough recycled aluminum alloy, and its formula is as follows:

[0077] Si 3.2wt%;

[0078] Cu 2.95wt%;

[0079] Mg 0.2wt%;

[0080] Mn 0.022wt%;

[0081] Cr 0.038wt%;

[0082] Ti 0.41wt%;

[0083] Sr 0.019wt%;

[0084] Fe and impurities 0.08wt%;

[0085] Al Residue.

[0086] The method for preparing the high-strength and ultra-tough recycled aluminum alloy of this embodiment comprises the following steps:

[0087] S1. Recovery and pretreatment

[0088] Collect aluminum alloy scrap from different sources, sort the collected scrap, remove surface impurities, and crush the sorted scrap into small pieces or powder;

[0089] S2. Smelting and purification

[0090] The treated aluminum scrap is placed in a furnace and heated to above the melting point to melt it. In the molten state, chemical reagents are used to remove non-metallic impurities therein, and inert gas is blown into the melt to remove hydrogen bubbles and other gas inclusions;

[0091] S3. Alloying

[0092] According to the specific composition requirements of the required alloy, an appropriate amount of alloying elements is added during the smelting process so that the added alloying elements can be fully diffused into the aluminum alloy matrix;

[0093] S4, forming and heat treatment

[0094] The molten aluminum alloy is cast into a shape, and then solution treated and aging hardened;

[0095] Solution treatment is to heat the casting to a certain temperature and then cool it rapidly to dissolve the alloy elements into the matrix;

[0096] Age hardening is to keep the solution treated material at a relatively low temperature for a period of time to promote the formation of precipitation strengthening phases;

[0097] S5. Post-processing

[0098] Machining is performed according to the size and shape requirements of the final product, followed by anodizing and electroplating.

[0099] Example 3

[0100] This embodiment is used to prepare a high-strength and ultra-tough recycled aluminum alloy, and its formula is as follows:

[0101] Si 3.4wt%;

[0102] Cu 2.9wt%;

[0103] Mg 0.3wt%;

[0104] Mn 0.024wt%;

[0105] Cr 0.036wt%;

[0106] Ti 0.42wt%;

[0107] Sr 0.018wt%;

[0108] Fe and impurities 0.07wt%;

[0109] Al Residue.

[0110] The method for preparing the high-strength and ultra-tough recycled aluminum alloy of this embodiment comprises the following steps:

[0111] S1. Recovery and pretreatment

[0112] Collect aluminum alloy scrap from different sources, sort the collected scrap, remove surface impurities, and crush the sorted scrap into small pieces or powder;

[0113] S2. Smelting and purification

[0114] The treated aluminum scrap is placed in a furnace and heated to above the melting point to melt it. In the molten state, chemical reagents are used to remove non-metallic impurities therein, and inert gas is blown into the melt to remove hydrogen bubbles and other gas inclusions;

[0115] S3. Alloying

[0116] According to the specific composition requirements of the required alloy, an appropriate amount of alloying elements is added during the smelting process so that the added alloying elements can be fully diffused into the aluminum alloy matrix;

[0117] S4, forming and heat treatment

[0118] The molten aluminum alloy is cast into a shape, and then solution treated and aging hardened;

[0119] Solution treatment is to heat the casting to a certain temperature and then cool it rapidly to dissolve the alloy elements into the matrix;

[0120] Age hardening is to keep the solution treated material at a relatively low temperature for a period of time to promote the formation of precipitation strengthening phases;

[0121] S5. Post-processing

[0122] Machining is performed according to the size and shape requirements of the final product, followed by anodizing and electroplating.

[0123] Example 4

[0124] This embodiment is used to prepare a high-strength and ultra-tough recycled aluminum alloy, and its formula is as follows:

[0125] Si 3.6wt%;

[0126] Cu 2.85wt%;

[0127] Mg 0.4wt%;

[0128] Mn 0.026wt%;

[0129] Cr 0.034wt%;

[0130] Ti 0.43wt%;

[0131] Sr 0.017wt%;

[0132] Fe and impurities 0.08wt%;

[0133] Al Residue.

[0134] The method for preparing the high-strength and ultra-tough recycled aluminum alloy of this embodiment comprises the following steps:

[0135] S1. Recovery and pretreatment

[0136] Collect aluminum alloy scrap from different sources, sort the collected scrap, remove surface impurities, and crush the sorted scrap into small pieces or powder;

[0137] S2. Smelting and purification

[0138] The treated aluminum scrap is placed in a furnace and heated to above the melting point to melt it. In the molten state, chemical reagents are used to remove non-metallic impurities therein, and inert gas is blown into the melt to remove hydrogen bubbles and other gas inclusions;

[0139] S3. Alloying

[0140] According to the specific composition requirements of the required alloy, an appropriate amount of alloying elements is added during the smelting process so that the added alloying elements can be fully diffused into the aluminum alloy matrix;

[0141] S4, forming and heat treatment

[0142] The molten aluminum alloy is cast into a shape, and then solution treated and aging hardened;

[0143] Solution treatment is to heat the casting to a certain temperature and then cool it rapidly to dissolve the alloy elements into the matrix;

[0144] Age hardening is to keep the solution treated material at a relatively low temperature for a period of time to promote the formation of precipitation strengthening phases;

[0145] S5. Post-processing

[0146] Machining is performed according to the size and shape requirements of the final product, followed by anodizing and electroplating.

[0147] Example 5

[0148] This embodiment is used to prepare a high-strength and ultra-tough recycled aluminum alloy, and its formula is as follows:

[0149] Si 3.8wt%;

[0150] Cu 2.8wt%;

[0151] Mg 0.5wt%;

[0152] Mn 0.028wt%;

[0153] Cr 0.032wt%;

[0154] Ti 0.44wt%;

[0155] Sr 0.016wt%;

[0156] Fe and impurities 0.09wt%;

[0157] Al Residue.

[0158] The method for preparing the high-strength and ultra-tough recycled aluminum alloy of this embodiment comprises the following steps:

[0159] S1. Recovery and pretreatment

[0160] Collect aluminum alloy scrap from different sources, sort the collected scrap, remove surface impurities, and crush the sorted scrap into small pieces or powder;

[0161] S2. Smelting and purification

[0162] The treated aluminum scrap is placed in a furnace and heated to above the melting point to melt it. In the molten state, chemical reagents are used to remove non-metallic impurities therein, and inert gas is blown into the melt to remove hydrogen bubbles and other gas inclusions;

[0163] S3. Alloying

[0164] According to the specific composition requirements of the required alloy, an appropriate amount of alloying elements is added during the smelting process so that the added alloying elements can be fully diffused into the aluminum alloy matrix;

[0165] S4, forming and heat treatment

[0166] The molten aluminum alloy is cast into a shape, and then solution treated and aging hardened;

[0167] Solution treatment is to heat the casting to a certain temperature and then cool it rapidly to dissolve the alloy elements into the matrix;

[0168] Age hardening is to keep the solution treated material at a relatively low temperature for a period of time to promote the formation of precipitation strengthening phases;

[0169] S5. Post-processing

[0170] Machining is performed according to the size and shape requirements of the final product, followed by anodizing and electroplating.

[0171] Example 6

[0172] This embodiment is used to prepare a high-strength and ultra-tough recycled aluminum alloy, and its formula is as follows:

[0173] Si 4wt%;

[0174] Cu 2.75wt%;

[0175] Mg 0.15wt%;

[0176] Mn 0.03wt%;

[0177] Cr 0.03wt%;

[0178] Ti 0.45wt%;

[0179] Sr 0.015wt%;

[0180] Fe and impurities 0.07wt%;

[0181] Al Residue.

[0182] The method for preparing the high-strength and ultra-tough recycled aluminum alloy of this embodiment comprises the following steps:

[0183] S1. Recovery and pretreatment

[0184] Collect aluminum alloy scrap from different sources, sort the collected scrap, remove surface impurities, and crush the sorted scrap into small pieces or powder;

[0185] S2. Smelting and purification

[0186] The treated aluminum scrap is placed in a furnace and heated to above the melting point to melt it. In the molten state, chemical reagents are used to remove non-metallic impurities therein, and inert gas is blown into the melt to remove hydrogen bubbles and other gas inclusions;

[0187] S3. Alloying

[0188] According to the specific composition requirements of the required alloy, an appropriate amount of alloying elements is added during the smelting process so that the added alloying elements can be fully diffused into the aluminum alloy matrix;

[0189] S4, forming and heat treatment

[0190] The molten aluminum alloy is cast into a shape, and then solution treated and aging hardened;

[0191] Solution treatment is to heat the casting to a certain temperature and then cool it rapidly to dissolve the alloy elements into the matrix;

[0192] Age hardening is to keep the solution treated material at a relatively low temperature for a period of time to promote the formation of precipitation strengthening phases;

[0193] S5. Post-processing

[0194] Machining is performed according to the size and shape requirements of the final product, followed by anodizing and electroplating.

[0195] Example 7

[0196] This embodiment is used to prepare a high-strength and ultra-tough recycled aluminum alloy, and its formula is as follows:

[0197] Si 4.2wt%;

[0198] Cu 2.7wt%;

[0199] Mg 0.25wt%;

[0200] Mn 0.032wt%;

[0201] Cr 0.028wt%;

[0202] Ti 0.46wt%;

[0203] Sr 0.014wt%;

[0204] Fe and impurities 0.08wt%;

[0205] Al Residue.

[0206] The method for preparing the high-strength and ultra-tough recycled aluminum alloy of this embodiment comprises the following steps:

[0207] S1. Recovery and pretreatment

[0208] Collect aluminum alloy scrap from different sources, sort the collected scrap, remove surface impurities, and crush the sorted scrap into small pieces or powder;

[0209] S2. Smelting and purification

[0210] The treated aluminum scrap is placed in a furnace and heated to above the melting point to melt it. In the molten state, chemical reagents are used to remove non-metallic impurities therein, and inert gas is blown into the melt to remove hydrogen bubbles and other gas inclusions;

[0211] S3. Alloying

[0212] According to the specific composition requirements of the required alloy, an appropriate amount of alloying elements is added during the smelting process so that the added alloying elements can be fully diffused into the aluminum alloy matrix;

[0213] S4, forming and heat treatment

[0214] The molten aluminum alloy is cast into a shape, and then solution treated and aging hardened;

[0215] Solution treatment is to heat the casting to a certain temperature and then cool it rapidly to dissolve the alloy elements into the matrix;

[0216] Age hardening is to keep the solution treated material at a relatively low temperature for a period of time to promote the formation of precipitation strengthening phases;

[0217] S5. Post-processing

[0218] Machining is performed according to the size and shape requirements of the final product, followed by anodizing and electroplating.

[0219] Example 8

[0220] This embodiment is used to prepare a high-strength and ultra-tough recycled aluminum alloy, and its formula is as follows:

[0221] Si 4.4wt%;

[0222] Cu 2.65wt%;

[0223] Mg 0.35wt%;

[0224] Mn 0.034wt%;

[0225] Cr 0.026wt%;

[0226] Ti 0.47wt%;

[0227] Sr 0.013wt%;

[0228] Fe and impurities 0.09wt%;

[0229] Al Residue.

[0230] The method for preparing the high-strength and ultra-tough recycled aluminum alloy of this embodiment comprises the following steps:

[0231] S1. Recovery and pretreatment

[0232] Collect aluminum alloy scrap from different sources, sort the collected scrap, remove surface impurities, and crush the sorted scrap into small pieces or powder;

[0233] S2. Smelting and purification

[0234] The treated aluminum scrap is placed in a furnace and heated to above the melting point to melt it. In the molten state, chemical reagents are used to remove non-metallic impurities therein, and inert gas is blown into the melt to remove hydrogen bubbles and other gas inclusions;

[0235] S3. Alloying

[0236] According to the specific composition requirements of the required alloy, an appropriate amount of alloying elements is added during the smelting process so that the added alloying elements can be fully diffused into the aluminum alloy matrix;

[0237] S4, forming and heat treatment

[0238] The molten aluminum alloy is cast into a shape, and then solution treated and aging hardened;

[0239] Solution treatment is to heat the casting to a certain temperature and then cool it rapidly to dissolve the alloy elements into the matrix;

[0240] Age hardening is to keep the solution treated material at a relatively low temperature for a period of time to promote the formation of precipitation strengthening phases;

[0241] S5. Post-processing

[0242] Machining is performed according to the size and shape requirements of the final product, followed by anodizing and electroplating.

[0243] Example 9

[0244] This embodiment is used to prepare a high-strength and ultra-tough recycled aluminum alloy, and its formula is as follows:

[0245] Si 4.6wt%;

[0246] Cu 2.6wt%;

[0247] Mg 0.45wt%;

[0248] Mn 0.036wt%;

[0249] Cr 0.024wt%;

[0250] Ti 0.48wt%;

[0251] Sr 0.012wt%;

[0252] Fe and impurities 0.07wt%;

[0253] Al Residue.

[0254] The method for preparing the high-strength and ultra-tough recycled aluminum alloy of this embodiment comprises the following steps:

[0255] S1. Recovery and pretreatment

[0256] Collect aluminum alloy scrap from different sources, sort the collected scrap, remove surface impurities, and crush the sorted scrap into small pieces or powder;

[0257] S2. Smelting and purification

[0258] The treated aluminum scrap is placed in a furnace and heated to above the melting point to melt it. In the molten state, chemical reagents are used to remove non-metallic impurities therein, and inert gas is blown into the melt to remove hydrogen bubbles and other gas inclusions;

[0259] S3. Alloying

[0260] According to the specific composition requirements of the required alloy, an appropriate amount of alloying elements is added during the smelting process so that the added alloying elements can be fully diffused into the aluminum alloy matrix;

[0261] S4, forming and heat treatment

[0262] The molten aluminum alloy is cast into a shape, and then solution treated and aging hardened;

[0263] Solution treatment is to heat the casting to a certain temperature and then cool it rapidly to dissolve the alloy elements into the matrix;

[0264] Age hardening is to keep the solution treated material at a relatively low temperature for a period of time to promote the formation of precipitation strengthening phases;

[0265] S5. Post-processing

[0266] Machining is performed according to the size and shape requirements of the final product, followed by anodizing and electroplating.

[0267] Example 10

[0268] This embodiment is used to prepare a high-strength and ultra-tough recycled aluminum alloy, and its formula is as follows:

[0269] Si 4.8wt%;

[0270] Cu 2.55wt%;

[0271] Mg 0.2wt%;

[0272] Mn 0.038wt%;

[0273] Cr 0.022wt%;

[0274] Ti 0.49wt%;

[0275] Sr 0.011wt%;

[0276] Fe and impurities 0.06wt%;

[0277] Al Residue.

[0278] The method for preparing the high-strength and ultra-tough recycled aluminum alloy of this embodiment comprises the following steps:

[0279] S1. Recovery and pretreatment

[0280] Collect aluminum alloy scrap from different sources, sort the collected scrap, remove surface impurities, and crush the sorted scrap into small pieces or powder;

[0281] S2. Smelting and purification

[0282] The treated aluminum scrap is placed in a furnace and heated to above the melting point to melt it. In the molten state, chemical reagents are used to remove non-metallic impurities therein, and inert gas is blown into the melt to remove hydrogen bubbles and other gas inclusions;

[0283] S3. Alloying

[0284] According to the specific composition requirements of the required alloy, an appropriate amount of alloying elements is added during the smelting process so that the added alloying elements can be fully diffused into the aluminum alloy matrix;

[0285] S4, forming and heat treatment

[0286] The molten aluminum alloy is cast into a shape, and then solution treated and aging hardened;

[0287] Solution treatment is to heat the casting to a certain temperature and then cool it rapidly to dissolve the alloy elements into the matrix;

[0288] Age hardening is to keep the solution treated material at a relatively low temperature for a period of time to promote the formation of precipitation strengthening phases;

[0289] S5. Post-processing

[0290] Machining is performed according to the size and shape requirements of the final product, followed by anodizing and electroplating.

[0291] Embodiment 11

[0292] This embodiment is used to prepare a high-strength and ultra-tough recycled aluminum alloy, and its formula is as follows:

[0293] Si 5wt%;

[0294] Cu 2.5wt%;

[0295] Mg 0.3wt%;

[0296] Mn 0.04wt%;

[0297] Cr 0.02wt%;

[0298] Ti 0.5wt%;

[0299] Sr 0.012wt%;

[0300] Fe and impurities 0.07wt%;

[0301] Al Residue.

[0302] The method for preparing the high-strength and ultra-tough recycled aluminum alloy of this embodiment comprises the following steps:

[0303] S1. Recovery and pretreatment

[0304] Collect aluminum alloy scrap from different sources, sort the collected scrap, remove surface impurities, and crush the sorted scrap into small pieces or powder;

[0305] S2. Smelting and purification

[0306] The treated aluminum scrap is placed in a furnace and heated to above the melting point to melt it. In the molten state, chemical reagents are used to remove non-metallic impurities therein, and inert gas is blown into the melt to remove hydrogen bubbles and other gas inclusions;

[0307] S3. Alloying

[0308] According to the specific composition requirements of the required alloy, an appropriate amount of alloying elements is added during the smelting process so that the added alloying elements can be fully diffused into the aluminum alloy matrix;

[0309] S4, forming and heat treatment

[0310] The molten aluminum alloy is cast into a shape, and then solution treated and aging hardened;

[0311] Solution treatment is to heat the casting to a certain temperature and then cool it rapidly to dissolve the alloy elements into the matrix;

[0312] Age hardening is to keep the solution treated material at a relatively low temperature for a period of time to promote the formation of precipitation strengthening phases;

[0313] S5. Post-processing

[0314] Machining is performed according to the size and shape requirements of the final product, followed by anodizing and electroplating.

[0315] The high-strength and ultra-tough recycled aluminum alloy prepared in the above Examples 1 to 11 was processed into aluminum alloy test pieces, and the performance was tested. Tensile strength: Tensile test (Tensile Test), by stretching the sample until it breaks, recording the maximum load divided by the original cross-sectional area to obtain the tensile strength. Elongation after fracture: In the tensile test, the length change rate of the sample after it is broken. Impact toughness: Charpy impact test. The results are shown in Table 1.

[0316] Table 1

[0317] Aluminum Alloy Tensile strength / MPa Elongation after fracture / 100% Impact toughness / J Example 1 258 8.5 22 Example 2 263 9.3 23 Example 3 275 9.5 24 Example 4 288 9.8 25 Example 5 302 10.4 26 Example 6 315 10.6 28 Example 7 336 11.7 30 Example 8 329 10.9 33 Example 9 308 10.4 29 Example 10 298 9.7 25 Embodiment 11 284 9.4 22

[0318] It can be seen from Examples 1 to 11 and Table 1 that the tensile strength of the aluminum alloy prepared in the present application can reach above 250 MPa, the elongation at break can reach above 8.5%, and the impact toughness can reach above 22 J.

[0319] And in the technical solution of the present application, when the aluminum alloy formula is Si 3.8~4.6wt%; Cu2.6~2.8wt%; Mg0.15~0.5wt%; Mn 0.028~0.036wt%; Cr 0.024~0.032wt%; Ti 0.44~0.48wt%; Sr0.012~0.016wt%; Fe and impurities are less than 0.1wt%; Al remainder; the tensile strength of the prepared aluminum alloy can reach more than 300MPa, the elongation at break can reach more than 10.4%, and the impact toughness can reach more than 26J, with higher strength and better toughness.

[0320] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-strength and ultra-tough recycled aluminum alloy, characterized in that: Made from the following components by weight percentage: Si 3-5wt%; Cu 2.5~3wt%; Mg 0.1~0.5wt%; Mn 0.02~0.04wt%; Cr 0.02~0.04wt%; Ti 0.4~0.5wt%; Sr 0.01~0.02wt%; Fe and impurities are less than 0.1wt%; Al Residue.

2. The high-strength and ultra-tough recycled aluminum alloy according to claim 1, characterized in that: Made from the following components by weight percentage: Si 3.8~4.6wt%; Cu 2.6~2.8wt%; Mg 0.15~0.5wt%; Mn 0.028~0.036wt%; Cr 0.024~0.032wt%; Ti 0.44~0.48wt%; Sr 0.012~0.016wt%; Fe and impurities are less than 0.1wt%; Al Residue.

3. A method for preparing the high-strength and ultra-tough recycled aluminum alloy according to claim 1, characterized in that: The following steps are involved: S1. Recovery and pretreatment Collect aluminum alloy scrap from different sources, sort the collected scrap, remove surface impurities, and crush the sorted scrap into small pieces or powder; S2. Smelting and purification The treated aluminum scrap is placed in a furnace and heated to above the melting point to melt it. In the molten state, chemical reagents are used to remove non-metallic impurities therein, and inert gas is blown into the melt to remove hydrogen bubbles and other gas inclusions; S3. Alloying According to the specific composition requirements of the required alloy, an appropriate amount of alloying elements is added during the smelting process so that the added alloying elements can be fully diffused into the aluminum alloy matrix; S4, forming and heat treatment The molten aluminum alloy is cast into a shape, and then solution treated and aging hardened; S5. Post-processing Machining is performed according to the size and shape requirements of the final product, followed by anodizing and electroplating.

4. The method for preparing the high-strength and ultra-tough recycled aluminum alloy according to claim 3, characterized in that: In the above-mentioned S4, forming and heat treatment, the solution treatment is: heating the casting to a certain temperature and then rapidly cooling it to dissolve the alloy elements in the matrix.

5. The method for preparing the high-strength and ultra-tough recycled aluminum alloy according to claim 3, characterized in that: In the above-mentioned S4, forming and heat treatment, aging hardening is: keeping the solution treated material at a relatively low temperature for a period of time to promote the formation of precipitation strengthening phase.

6. An aluminum alloy profile, characterized in that: It is prepared by the high-strength and super-tough recycled aluminum alloy described in claim 1.