A deformed aluminum alloy, a deformed aluminum alloy product and a preparation method thereof

Abstract

The present invention discloses a deformed aluminum alloy, wherein the composition of the deformed aluminum alloy includes the following components in weight percentage: 0.4-0.8% Cu, 1.5-3% Si, 0.05-0.2% Fe, 0.01-0.4% Mn, 0.8-1.2% Mg, Cr≤0.05%, Zn≤0.001%, Ni≤0.01%, 0.01-0.1% Ti, and the balance is aluminum. The present invention also claims a method for preparing the deformed aluminum alloy, and a deformed aluminum alloy product made of the deformed aluminum alloy, and a method for preparing the product. The deformed aluminum alloy and the product thereof of the present invention have good flow properties, good product appearance quality, and good anodizing treatment effect.

Description

Technical Field

[0001] The present invention relates to the field of aluminum alloy materials, and in particular to a deformed aluminum alloy, a deformed aluminum alloy product and a preparation method thereof. Background Art

[0002] As people's requirements for the appearance of products (such as 3C electronic products) become higher, the color difference of traditional die-cast aluminum alloys after anodizing cannot meet the requirements. People have turned their attention to deformed aluminum alloys with good coloring effects after anodizing. However, due to its poor fluidity, deformed aluminum alloys will produce cracks and shrinkage holes during die casting or extrusion casting, which limits its application. Therefore, it is urgent to find an aluminum alloy that can meet the needs of die casting production and anodizing effects. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a deformed aluminum alloy that can meet both the needs of die-casting production and the needs of anodizing effects. The present invention also provides a method for preparing the deformed aluminum alloy, and also provides a deformed aluminum alloy product made of the deformed aluminum alloy and a method for preparing the product.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A deformed aluminum alloy, the composition of the deformed aluminum alloy includes the following components in weight percentage: 0.4-0.8% Cu, 1.5-3% Si, 0.05-0.2% Fe, 0.01-0.4% Mn, 0.8-1.2% Mg, Cr≤0.05%, Zn≤0.001%, Ni≤0.01%, 0.01-0.1% Ti, and the balance is aluminum.

[0006] In the present invention, a further preferred scheme is that the composition of the deformed aluminum alloy includes the following components in weight percentage: 0.68-0.7% Cu, 1.5-3% Si, 0.063-0.072% Fe, 0.01-0.014% Mn, 0.81-0.86% Mg, Cr≤0.002%, Zn≤0.001%, Ni≤0.001%, 0.012-0.019% Ti, and the balance is aluminum.

[0007] In the present invention, a further preferred scheme is that the composition of the deformed aluminum alloy includes the following components in weight percentage: 0.69% Cu, 2.7% Si, 0.072% Fe, 0.012% Mn, 0.85% Mg, Cr≤0.002%, Zn≤0.001%, Ni≤0.001%, 0.015% Ti, and the balance is aluminum.

[0008] The present invention also claims protection for a method for preparing the deformed aluminum alloy, comprising the following steps: heating Si, intermediate alloy Al-40%Cu, and intermediate alloy Al-10%Mn to 710-730°C to melt, then adding Mg, refining and degassing for 15-20 minutes, adding intermediate alloy Al-5Ti during the refining and degassing process, then standing for 12-15 minutes to obtain alloy liquid, then reducing the alloy liquid temperature to 670-690°C, and cooling to obtain the alloy liquid.

[0009] The present invention also claims protection for a deformed aluminum alloy product, which is made of the deformed aluminum alloy of any one of the above schemes.

[0010] In the present invention, a further preferred solution is that the fluidity of the deformed aluminum alloy is 23.5-26.1 mm, the elongation is 7.8-8.6%, and the yield strength is 340-355 MPa.

[0011] In the present invention, a further preferred solution is that in the deformed aluminum alloy product, the average grain size is 40-50 μm, and the average size of the Mg2Si phase particles is 0.3-1 μm.

[0012] The deformed aluminum alloy product in the present invention can be one of a 3C product frame, a 3C product middle frame, and a 3C product back panel.

[0013] The present invention also claims protection for a method for preparing the deformed aluminum alloy product, comprising the following steps: heating Si, intermediate alloy Al-40%Cu, and intermediate alloy Al-10%Mn to 710-730°C to melt, then adding Mg, refining and degassing for 15-20 minutes, adding intermediate alloy Al-5Ti during the refining and degassing process, then standing for 12-15 minutes to obtain alloy liquid, then reducing the temperature of the alloy liquid to 670-690°C; then using the Giss method to make the aluminum alloy liquid into a semi-solid aluminum alloy slurry, and then using an extrusion casting process to obtain a deformed aluminum alloy product.

[0014] In the present invention, a further preferred scheme is that in the extrusion casting process, the first injection speed of the semi-solid aluminum alloy slurry in the barrel is 100-200 mm / s, the second injection speed of the semi-solid slurry pressed into the mold from the gate is 3.4 times the first injection speed, the mold temperature is 200-230°C, the holding pressure is 150-200 MPa, and the holding time is 5-20s.

[0015] In the present invention, a further preferred solution is that the first injection speed is 200 mm / s, the mold temperature is 220° C., the holding pressure is 200 MPa, and the holding time is 10 s.

[0016] In the present invention, a further preferred scheme is to sequentially subject the obtained deformed aluminum alloy product to solution treatment, quenching treatment and aging treatment, wherein the solution treatment is to heat the deformed aluminum alloy product to 540-560°C and then keep it warm for 2-4h; the quenching treatment is to place the deformed aluminum alloy product after the solution treatment in water at 25-35°C for 20s and quench it for 20-60s; the aging treatment is to keep the deformed aluminum alloy product after the quenching treatment at a constant temperature of 170-190°C for 7-9h and then air cool it to room temperature.

[0017] Compared with the prior art, the beneficial effects of the present invention are: the deformed aluminum alloy and its products have good flow properties, good product appearance quality, and good anodizing treatment effect; the preparation method of the present invention is easy to operate and convenient for industrial production application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a spiral tube structure in a spiral test mold for testing fluidity in various embodiments and comparative examples of the present invention;

[0019] Figure 2 The product appearance photos of the deformed aluminum alloy products of some embodiments and comparative examples in Example 1;

[0020] Figure 3 These are photos of deformed aluminum alloy products of some examples and comparative examples in Example 1 after anodizing treatment;

[0021] Figure 4 This is an electron microscope image of the deformed aluminum alloy product of Comparative Example 1;

[0022] Figure 5 is an electron microscope image of the deformed aluminum alloy product of Example 2;

[0023] Figure 6 is an electron microscope image of the deformed aluminum alloy product of Example 5;

[0024] in, Figure 2 A corresponds to the deformed aluminum alloy product of Example 1, B corresponds to the deformed aluminum alloy product of Example 9, C corresponds to the deformed aluminum alloy product of Example 2, D corresponds to the deformed aluminum alloy product of Example 5, and E corresponds to the deformed aluminum alloy product of Example 1;

[0025] Figure 3 In the figure, reference numeral 1 corresponds to the deformed aluminum alloy product of Example 14 after anodizing treatment; reference numeral 2 corresponds to the deformed aluminum alloy product of Example 5 after anodizing treatment; reference numeral 3 corresponds to the deformed aluminum alloy product of Example 6 after anodizing treatment; reference numeral 4 corresponds to the deformed aluminum alloy product of Comparative Example 4 after anodizing treatment;

[0026] Figure 4-6 The magnification ratio is 1:100 (i.e. 1cm:100μm). DETAILED DESCRIPTION

[0027] Below, the present invention is further described in conjunction with the specific implementation methods and the drawings of the specification. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Unless otherwise specified, the materials and equipment used in this embodiment can be purchased from the market. The specific embodiments are exemplary and are only used to explain this application, and cannot be understood as limiting the scope of protection of this application.

[0028] A deformed aluminum alloy, the composition of the deformed aluminum alloy includes the following components in weight percentage: 0.4-0.8% Cu, 1.5-3% Si, 0.05-0.2% Fe, 0.01-0.4% Mn, 0.8-1.2% Mg, Cr≤0.05%, Zn≤0.001%, Ni≤0.01%, 0.01-0.1% Ti, and the balance is aluminum.

[0029] The deformed aluminum alloy of the present invention can reduce the crystal size in the aluminum alloy by adding Si element, thereby improving the fluidity of the aluminum alloy. On the other hand, Si element, as a high melting point element, can increase the liquid temperature of the alloy and also improve the fluidity; however, if the Si content is too high, its fluidity will be improved, but if the Si content is too high, it will affect the molding quality of extrusion casting, and shrinkage cavities / cracks will appear on the obtained product, and it will also affect the subsequent anodizing processing effect. In the present invention, the Si content is selected to be 1.5-3%, which can better take into account the fluidity, product quality (mainly shrinkage cavities / cracks) and anodizing effect.

[0030] For Cr, Zn and Ni in the present invention, in some embodiments, they can be regarded as inevitable impurities. By adjusting the dosage of other elements, it is also possible to achieve a balance between flow properties, product quality (mainly shrinkage holes / cracks) and anodizing effects; the corresponding solution is that the composition of the deformed aluminum alloy includes the following components in weight percentage: 0.68-0.7% Cu, 1.5-3% Si, 0.063-0.072% Fe, 0.01-0.014% Mn, 0.81-0.86% Mg, Cr≤0.002%, Zn≤0.001%, Ni≤0.001%, 0.012-0.019% Ti, and the balance is aluminum.

[0031] In the present invention, a more preferred embodiment is that the composition of the deformed aluminum alloy includes the following components in weight percentage: 0.69% Cu, 2.7% Si, 0.072% Fe, 0.012% Mn, 0.85% Mg, Cr≤0.002%, Zn≤0.001%, Ni≤0.001%, 0.015% Ti, and the balance is aluminum; through this arrangement, the deformed aluminum alloy can have good flow properties, and the obtained parallel aluminum alloy product has neither cracks nor shrinkage cavities, and also has a good anodizing effect.

[0032] In some embodiments of the present invention, the method for preparing the deformed aluminum alloy comprises the following steps: heating Si, the intermediate alloy Al-40%Cu, and the intermediate alloy Al-10%Mn to 710-730°C to melt, then adding Mg, refining and degassing for 15-20 minutes, adding the intermediate alloy Al-5Ti during the refining and degassing process, then standing for 12-15 minutes to obtain an alloy liquid, then reducing the temperature of the alloy liquid to 670-690°C and cooling.

[0033] The present invention also claims protection for a deformed aluminum alloy product, which is made of the deformed aluminum alloy of any one of the above-mentioned schemes, that is, the material of the deformed aluminum alloy product is the deformed aluminum alloy of any one of the above-mentioned schemes; the deformed aluminum alloy product can be exemplified by 3C electronic products, mechanical parts, automobile parts, aviation parts, etc.; for 3C electronic products, it can be exemplified by one of the 3C product frame, 3C product middle frame, and 3C product back panel.

[0034] In the present invention, a further preferred solution is that the fluidity of the deformed aluminum alloy is 23.5-26.1 mm, the elongation is 7.8-8.6%, and the yield strength is 340-355 MPa.

[0035] In the present invention, a further preferred solution is that in the deformed aluminum alloy product, the average size of the grains (aluminum matrix particles) is 40-50 μm, and the average size of the Mg2Si phase particles is 0.3-1 μm.

[0036] In some embodiments of the present invention, the method for preparing the deformed aluminum alloy product comprises the following steps: heating Si, the master alloy Al-40%Cu, and the master alloy Al-10%Mn to 710-730°C to melt, then adding Mg, refining and degassing for 15-20 minutes, adding the master alloy Al-5Ti during the refining and degassing process, then standing for 12-15 minutes to obtain an alloy liquid, and then reducing the temperature of the alloy liquid to 670-690°C; then using the Giss method to make the aluminum alloy liquid into a semi-solid aluminum alloy slurry, and then using an extrusion casting process to obtain a deformed aluminum alloy product.

[0037] For the extrusion casting process, in some embodiments, the following settings can be made: the first injection speed of the semi-solid aluminum alloy slurry in the barrel is 100-200 mm / s, the second injection speed of the semi-solid slurry pressed into the mold from the gate is 3.4 times the first injection speed, the mold temperature is 200-230°C, the holding pressure is 150-200 MPa, and the holding time is 5-20s.

[0038] During the extrusion casting process, the second injection speed is set to 3.4 times of the first injection speed, which can shorten the time for the semi-solid aluminum alloy slurry to enter the mold and achieve faster filling. For the temperature of the semi-solid aluminum alloy slurry in the extrusion casting process of the present invention, it can be selected to be 670-730°C. When the pouring temperature is greater than 730°C, the fluidity of the aluminum alloy liquid increases. Although it is beneficial to filling the mold, it is easy to increase the amount of gas inhaled, resulting in defects such as pores caused by air entrainment, and too high a temperature is also likely to reduce the life of the mold; when the pouring temperature is less than 670°C, the fluidity of the aluminum alloy liquid will decrease, which is not conducive to filling the mold, and it is easy to produce thermal cracking defects, and the alloy liquid is also easy to form a hard shell layer in the barrel, which hinders the pressure of the punch on the alloy liquid, causing uneven heat transfer and defects; the pouring temperature of the alloy liquid is selected to be 670-730°C, which can reduce product quality defects such as air entrainment and thermal cracking, and can also increase the service life of the mold. The temperature of the mold during the extrusion casting process also has a certain influence on the product quality. When the mold temperature is less than 200°C, the alloy liquid will quickly exchange heat when it encounters the mold wall during filling, resulting in insufficient filling near the mold wall, which is prone to cracks; when the mold temperature is greater than 300°C, the cooling time of the alloy liquid will become longer, and quality defects such as bubbles will occur. In addition, too high a mold temperature can easily cause adhesion between the mold and the casting, reducing the service life of the mold; and selecting the mold temperature in the indirect extrusion casting process to be 200-300°C can reduce product quality defects such as cracks and bubbles, and can also increase the service life of the mold; in the present invention, a more suitable mold temperature is 200-230°C.

[0039] In the extrusion casting process, a more preferred method is: the first injection speed is 200 mm / s, the mold temperature is 220° C., the holding pressure is 200 MPa, and the holding time is 10 s.

[0040] In some embodiments, in order to further improve the physical properties of the deformed aluminum alloy and the anodizing effect, the following settings can be made: the obtained deformed aluminum alloy product is subjected to solution treatment, quenching treatment and aging treatment in sequence, wherein the solution treatment is to heat the deformed aluminum alloy product to 540-560°C and then keep it warm for 2-4 hours; the quenching treatment is to immerse the deformed aluminum alloy product after the solution treatment in 25-35°C water for 20 seconds and quench it for 20-60 seconds; the aging treatment is to keep the quenched deformed aluminum alloy product at a constant temperature of 170-190°C for 7-9 hours and then air-cool it to room temperature. After the above treatment, on the one hand, the second phase particles will have a higher degree of spheroidization during the precipitation process, which can make the strength of the aluminum alloy product better and the fluidity can be improved to a certain extent; on the other hand, after the solid solution treatment, the alloy elements such as Mg and Si in the second phase of the deformed aluminum alloy product are dissolved back into the aluminum matrix; then quenching treatment is carried out in this state, which will make the aluminum matrix reach a supersaturated solid solution state; with the progress of aging, the second phase particles such as Mg2Si phase will be dispersed and evenly distributed, and the size of the Mg2Si phase particles will also be smaller due to the dispersed distribution, which will reduce the difference in corrosion potential between the second phase and the aluminum matrix in the subsequent anodizing process, thereby reducing the difference in corrosion degree between the second phase and the aluminum matrix in the anodizing process, thereby making the anodizing effect of the deformed aluminum alloy product better.

[0041] Example 1-Example 13

[0042] The deformed aluminum alloy products (frames of certain 3C electronic products) of Examples 1 to 13 are respectively made of deformed aluminum alloys corresponding to the formulations in Table 1 (see Table 1 for formulation components), and the specific formulations are as follows:

[0043] Table 1: Deformed aluminum alloy formula table of Example 1 to Example 13

[0044]

[0045] The deformed aluminum alloy products of each embodiment (including embodiment 1 to embodiment 13) are prepared by the following method: Si, master alloy Al-40%Cu, and master alloy Al-10%Mn are heated to 720°C to melt, then Mg is added, refined and degassed for 15 minutes, and the master alloy Al-5Ti is added during the refining and degassing process, and then the alloy liquid is allowed to stand for 15 minutes to obtain the alloy liquid, and then the alloy liquid temperature is reduced to 680°C; then the aluminum alloy liquid is made into a semi-solid aluminum alloy slurry by the Giss method, and then the deformed aluminum alloy product is prepared by an extrusion casting process; the extrusion casting process is as follows: the first injection speed of the semi-solid aluminum alloy slurry in the barrel is 200mm / s, the second injection speed of the semi-solid slurry pressed into the mold from the gate is 3.4 times the first injection speed, the mold temperature is 20°C, the holding pressure is 200MPa, and the holding time is 10s; the extrusion casting equipment adopts a liquid mold segment machine of a certain company on the market; the release agent adopts a release agent of a certain brand on the market.

[0046] Based on the deformed aluminum alloy products of the above embodiments, the fluidity, surface condition, yield strength and elongation are tested, wherein: the surface condition is observed with the naked eye (the number of shrinkage cavities and cracks are recorded, see Figure 2 ); The yield strength is tested using a commercially available "WDS-100KE tensile testing machine" of a certain company; the elongation is tested using the "GB / T3246.2-2012 Test Method for Deformed Aluminum and Aluminum Alloy Products Organization" standard;

[0047] The fluidity is tested using a spiral test mold made by the inventor. The structure of the spiral tube structure of the spiral test mold is shown in Figure 1 (The unit of dimensions is mm). The specific test method is to inject the aluminum alloy liquid into the spiral test mold through a liquid mold segment machine, and then measure the flow distance of the aluminum alloy liquid in the spiral test mold. The liquid mold segment machine adopts a liquid mold segment machine of a certain company on the market. The speed of the liquid aluminum alloy in the barrel is 200mm / s, and the speed of the liquid aluminum alloy injected from the gate into the spiral test mold is 680mm / s. The pouring temperature of the aluminum alloy liquid is 680℃, and the temperature of the spiral test mold is 245℃.

[0048] After testing the fluidity, shrinkage, cracks, yield strength and elongation, the anodizing effect was tested. The anodizing process was as follows: first, the deformed aluminum alloy product was chemically polished (polishing conditions: commercially available XF-611 aluminum chemical polishing agent, polishing at 100°C for 1 min), then washed with deionized water, and anodized after drying (anodizing process: anodizing sulfuric acid concentration of 180g / L, voltage 16V, oxidation treatment for 40min, water washing, then dyeing at room temperature for 3min, water washing, S30 sealing at 85°C for 20min, then water washing and drying), and the coloring effect was observed (see Figure 3 ); the corresponding effect evaluation preparation: 1) good, the surface coloring is uniform, no spots; 2) average, the coloring is uniform, a small amount of color difference spots; 3) bad, the coloring is uneven, a large number of color difference spots;

[0049] The microstructure of the deformed aluminum alloy was photographed using a commercially available metallographic microscope (magnification ratio was 100 times, i.e. 1 cm: 100 μm);

[0050] The properties of the deformed aluminum alloy products of each embodiment were tested in combination with the above test method. The specific data obtained are shown in Table 2:

[0051] Table 2: Performance test data of deformed aluminum alloy products of Examples 1 to 13

[0052]

[0053] Combined with Table 2 and Figure 2 It can be seen that the deformed aluminum alloy products of each embodiment of the present invention have good flow properties and appearance. Embodiments 9-13 are based on Embodiment 5, with the amounts of elements other than Si and Al fixed, and the Si content changed (the corresponding Al amount changes with the change of Si). Through the measured data and combined with the data of other embodiments, it can be seen that in the deformed aluminum alloy formula of the present invention, the flow properties are mainly affected by the Si element. Adjusting the Si element content can change the flowability of the deformed aluminum alloy products.

[0054] In addition, combined with Table 2 and Figure 2It can be seen that except for some embodiments (Example 6, Example 8, Example 12, Example 13) with average anode effects, the deformed aluminum alloy products in other embodiments all take into account both fluidity and anodizing effects. Further analysis shows that the embodiments with higher Si content have poor anodizing effects, and the corresponding Si content increases from 1.5% to 3%, and its fluidity basically shows an increasing trend, but the anodizing effect is poor starting from 2.8% Si content (although the anodizing effect is average, it can meet industrial production applications). Embodiment 5 (corresponding to the Si content of 2.7%) has the best fluidity while meeting good anodizing effects.

[0055] Embodiment 14

[0056] The deformed aluminum alloy product obtained in Example 5 was subjected to solution treatment, quenching treatment and aging treatment in sequence. The solution treatment was to heat the deformed aluminum alloy product to 550°C and then keep it warm for 3h; the quenching treatment was to place the deformed aluminum alloy product after the solution treatment in 30°C water for 20s and quench it for 30s; the aging treatment was to keep the deformed aluminum alloy product after the quenching treatment at 180°C for 8h and then air-cool it to room temperature; and then anodizing was performed (the anodizing method was the same as in Example 5). The surface condition of the product after anodizing was shown in FIG. Figure 3 .

[0057] In addition, the deformed aluminum alloy products of Example 1, Example 5 and Example 14 were taken, and then the average grain size and the average size of the Mg2Si phase particles were observed (the average size refers to the average diameter of the grains and the Mg2Si phase particles); the measured data are shown in Table 3:

[0058] Table 3: Average grain size and Mg2Si phase particle observation data

[0059]

[0060] From the above data in Table 3 and Figure 3It can be seen from the anodizing effect that: on the one hand, after the solid solution, quenching and aging treatment of the deformed aluminum alloy products, the second phase will be more spheroidized during the precipitation process, which can make the strength of the aluminum alloy products better and the fluidity can be improved to a certain extent. On the other hand, after the solid solution treatment, the alloy elements such as Mg and Si in the second phase of the deformed aluminum alloy products are dissolved back into the aluminum matrix; then quenching treatment is carried out in this state, which will make the aluminum matrix reach a supersaturated solid solution state; with the progress of aging, the Mg2Si phase will be dispersed and evenly distributed, and the size of the Mg2Si phase particles will be smaller due to the dispersed distribution, which will reduce the difference in corrosion potential between the second phase and the aluminum matrix in the subsequent anodizing process, thereby reducing the difference in corrosion degree between the second phase and the aluminum matrix during the anodizing process, and thus making the anodizing effect of the deformed aluminum alloy products better.

[0061] Comparative Example 1-Comparative Example 4

[0062] The deformed aluminum alloy products (frames of certain 3C electronic products) of Comparative Examples 1 to 4 are respectively made of deformed aluminum alloys corresponding to the formulations in Table 4 (see Table 4 for formulation components), and the specific formulations are as follows;

[0063] Table 4: Deformed aluminum alloy formula table of Comparative Examples 1 to 4

[0064]

[0065] The fluidity, anodizing effect, yield strength and elongation, and appearance were tested using the same test method as in Example 1. The test data are detailed in Table 5:

[0066] Table 5: Performance test data of deformed aluminum alloy products of Comparative Examples 1 to 4

[0067]

[0068] The deformed aluminum alloy products of Comparative Example 1 and Example 2 were photographed using the same metallographic microscope as that of Example 5 to examine the microstructure of the deformed aluminum alloy. The photographic results are shown in FIG. Figures 4 to 6 ;

[0069] Combined with Table 1-Table 5 and Figure 2 , Figure 3 , Figure 4-Figure 6It can be seen that when the Si content is lower than 1.5% (excluding this number), the fluidity of the deformed aluminum alloy products will be affected, and defects such as cracks will be easily generated during the casting process; when the Si content increases, although the fluidity problem is solved (corresponding to the solution of defects such as cracks), the anodizing effect will be affected. When the Si content is ≥3.1, the anodizing effect will be greatly affected, and a large number of color difference spots will appear on the surface of the corresponding deformed aluminum alloy products.

[0070] Finally, it should be noted that the above-mentioned implementation modes are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention are within the scope of protection required by the present invention.

Claims

1. A deformed aluminum alloy product, characterized in that: The deformed aluminum alloy product is made of a deformed aluminum alloy comprising the following components in weight percentage: 0.4-0.8% Cu, 1.5-3% Si, 0.05-0.2% Fe, 0.01-0.4% Mn, 0.8-1.2% Mg, Cr≤0.05%, Zn≤0.001%, Ni≤0.01%, 0.01-0.1% Ti, and the balance is aluminum; The deformed aluminum alloy product, the average grain size is 40-50μm, the average size of the Mg2Si phase particles is 0.3-1μm; The preparation of the deformed aluminum alloy product comprises the following steps: heating Si, master alloy Al-40%Cu, and master alloy Al-10%Mn to 710-730°C to melt, then adding Mg, refining and degassing for 15-20 minutes, adding master alloy Al-5Ti during the refining and degassing process, then standing for 12-15 minutes to obtain alloy liquid, then reducing the temperature of the alloy liquid to 670-690°C; then using the Giss method to make the aluminum alloy liquid into a semi-solid aluminum alloy slurry, and then using an extrusion casting process to obtain the deformed aluminum alloy product; The obtained deformed aluminum alloy product is subjected to solution treatment, quenching treatment and aging treatment in sequence, wherein the solution treatment is to heat the deformed aluminum alloy product to 540-560°C and then keep it warm for 2-4 hours; the quenching treatment is to immerse the deformed aluminum alloy product after the solution treatment in water at 25-35°C for 20 seconds and quench it for 20-60 seconds; the aging treatment is to keep the deformed aluminum alloy product after the quenching treatment at a constant temperature of 170-190°C for 7-9 hours and then air-cool it to room temperature.

2. The deformed aluminum alloy product according to claim 1, characterized in that: The deformed aluminum alloy has a fluidity of 23.5-26.1 mm, an elongation of 7.8-8.6%, and a yield strength of 340-355 MPa.

3. The deformed aluminum alloy product according to claim 1, characterized in that: The aluminum alloy product is one of a 3C product frame, a 3C product middle frame, and a 3C product back panel.

4. The method for preparing a deformed aluminum alloy product according to claim 1, characterized in that: In the extrusion casting process, the first injection speed of the semi-solid aluminum alloy slurry in the barrel is 100-200 mm / s, the second injection speed of the semi-solid slurry pressed into the mold from the gate is 3.4 times the first injection speed, the mold temperature is 200-230°C, the holding pressure is 150-200 MPa, and the holding time is 5-20s.

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