CN112210697A - Aluminum alloy and preparation method thereof, mobile phone middle frame and mobile phone - Google Patents

Abstract

The application provides an aluminum alloy, a preparation method thereof, a mobile phone middle frame and a mobile phone, wherein the aluminum alloy comprises the following components in percentage by mass based on the total mass of the aluminum alloy: 4 to 9 weight percent of Mg; 1-3 wt% of Fe; 0.48 to 1.58 weight percent of Mn; 0.1 wt% -0.3 wt% of Cr \ Ti, wherein the Cr \ Ti comprises at least one of Cr and Ti; and 84.12 wt% -93.92 wt% of aluminum. The aluminum alloy has good aluminum-plastic bonding force, strength, toughness and flowability, can be conveniently formed by die casting, and can be well suitable for die-casting the mobile phone middle frame.

Description

Aluminum alloy and preparation method thereof, mobile phone middle frame and mobile phone

technical field

The present application relates to the technical field of materials, and in particular, to an aluminum alloy and a preparation method thereof, a mobile phone middle frame and a mobile phone.

Background technique

There are mainly two molding methods for the existing mobile phone middle frame. One is direct CNC (numerical control machine) molding of deformed aluminum to make the appearance of the anode, which is highly dependent on the CNC machine and has high cost; the other is after injection molding, spraying The product obtained by this method has poor hand feeling and low performance.

Therefore, the current technology related to the middle frame of the aluminum alloy mobile phone still needs to be improved.

SUMMARY OF THE INVENTION

The present application aims to solve one of the technical problems in the related art at least to a certain extent.

The present application is completed based on the following findings and understandings of the inventors:

In view of the problems existing in the above-mentioned aluminum alloy mobile phone middle frame, the inventor proposes whether to use low-cost die-casting aluminum to make the mobile phone middle frame, so as to retain the feel and performance of the metal middle frame, and at the same time, it can also greatly reduce the cost and cost. CNC machine dependency. The inventor has found that the aluminum alloy used as the middle frame of the mobile phone needs to meet the performance requirements of at least the following three aspects: 1. As an appearance product, the corresponding aluminum alloy needs to have good flow formability, and can form the product completely, and at the same time the appearance surface 2. As an external product, it is required to have high anti-drop failure ability, and the corresponding aluminum alloy needs to have high strength and elongation; 3. The middle frame of the metal mobile phone needs to open the antenna slot to conduct the signal, In general, the antenna slot needs to be filled with plastic, and the aluminum alloy is required to have a high aluminum-plastic bonding ability. Based on the above findings and understandings, the inventor has conducted in-depth research, and by adjusting and controlling the composition of the die-casting aluminum alloy, the better bonding force, strength and toughness of the die-casting aluminum alloy and plastic are achieved, while maintaining the die-casting aluminum alloy. Good fluidity for easy die-casting.

In view of this, an object of the present application is to propose an aluminum alloy with good fluidity, aluminum-plastic bonding force, strength and toughness.

In one aspect of the present application, the present application provides an aluminum alloy. According to the embodiments of the present application, based on the total mass of the aluminum alloy, the aluminum alloy includes: 4wt%-9wt% of Mg; 1wt%-3wt% of Fe; 0.48wt%-1.58wt% in mass percentage. 0.5wt% to 2wt% of Zn; 0.1wt% to 0.3wt% of Cr\Ti including at least one of Cr and Ti; and 84.12wt% to 93.92wt% of aluminum. Through the adjustment and control of the alloy composition, the aluminum alloy has good aluminum-plastic bonding force, strength and toughness, and good fluidity, and can be easily formed by die-casting, and is well suited for die-casting the middle frame of mobile phones. It solves the problems of high cost and high dependence on equipment, and poor appearance and hand feeling effect of spraying treatment in the related art.

In another aspect of the present application, the present application provides a method of making the aforementioned aluminum alloy. According to the embodiment of the present application, the method includes: after heating and melting aluminum-containing raw materials, adding magnesium-containing raw materials, iron-containing raw materials, manganese-containing raw materials, zinc-containing raw materials and Cr\Ti-containing raw materials to obtain aluminum alloy liquid; The aluminum alloy liquid is refined and degassed and poured to obtain the aluminum alloy. The method is simple and convenient to operate, easy to implement industrially, and the obtained aluminum alloy has good mechanical properties, plastic workability, aluminum-plastic bonding force and fluidity.

In yet another aspect of the present application, the present application provides a middle frame of a mobile phone. According to an embodiment of the present application, at least a part of the middle frame of the mobile phone is formed of the aforementioned aluminum alloy. The middle frame of the mobile phone has good strength and anti-drop performance, and the aluminum alloy and plastic in it have strong bonding force, and the plastic filled in the antenna slot is firmly bonded, not easy to fall off, and has good performance and feel. , the middle frame of the mobile phone can be conveniently formed by die-casting, which greatly reduces the dependence on equipment and the cost.

In yet another aspect of the present application, the present application provides a mobile phone. According to an embodiment of the present application, the mobile phone includes the aforementioned middle frame of the mobile phone.

Description of drawings

FIG. 1 is a schematic structural diagram of an aluminum alloy test sample in the aluminum alloy tensile test of the present application.

FIG. 2 is a schematic structural diagram of a spiral sample in the fluidity test of the aluminum alloy of the present application.

FIG. 3 is a schematic structural diagram of an aluminum-plastic sample in the test of the aluminum-plastic bonding force of the aluminum alloy of the present invention.

4 is a schematic structural diagram of an aluminum-plastic sample after fracture in the aluminum-plastic bonding force test of the aluminum alloy of the present invention.

Fig. 5 is a metallographic microscope photograph of the aluminum alloy in the embodiment of the present invention.

Detailed ways

Embodiments of the present application are described in detail below. The embodiments described below are exemplary, only used to explain the present application, and should not be construed as a limitation to the present application. If no specific technique or condition is indicated in the examples, the technique or condition described in the literature in the field or the product specification is used. The reagents or instruments used without the manufacturer's indication are conventional products that can be obtained from the market.

In one aspect of the present application, the present application provides an aluminum alloy. According to the embodiments of the present application, based on the total mass of the aluminum alloy, the aluminum alloy includes: 4wt%-9wt% of Mg; 1wt%-3wt% of Fe; 0.48wt%-1.58wt% in mass percentage. 0.5wt% to 2wt% of Zn; 0.1wt% to 0.3wt% of Cr\Ti including at least one of Cr and Ti; and 84.12wt% to 93.92wt% of aluminum. Through the adjustment and control of the alloy composition, the aluminum alloy has good aluminum-plastic bonding force, strength and toughness, and good fluidity, which can be conveniently formed by die-casting, and can be well applied to die-casting to form the middle frame of mobile phones. The problems of high cost and high dependence on equipment, and poor appearance and hand feeling effect of spraying treatment in the related art are avoided.

The inventors of the present application have found through a large number of experiments that the magnesium content is in the range of 4wt% to 9wt% (specifically, such as 4wt%, 6wt%, 8wt%, 9wt%, etc.) If the magnesium content is lower than 4wt%, the fluidity of the alloy is insufficient. If the magnesium content is higher than 9wt%, the magnesium is easily oxidized and burnt out, forming oxides into the product and affecting the elongation of the aluminum alloy.

The inventors of the present application have found through a large number of experiments that the iron content is in the range of 1wt% to 3wt% (specifically, 1wt%, 2.0wt%, 3wt%, etc.), and the Mn content is 0.48wt% to 1.58wt% (specifically, 0.48wt%). %, 0.6 wt %, 0.8 wt %, 1 wt %, 1.25 wt %, 1.58 wt %, etc.), it is conducive to the improvement of the strength of the aluminum alloy, and it is also conducive to the demoulding during the die-casting process. If the iron and manganese content is not enough, the strength of the aluminum alloy will increase. Insufficient, if the content of iron and manganese is too high, a brittle aluminum-iron phase will be formed, which will seriously affect the elongation (ie, plasticity) of the alloy.

The inventors of the present application have found through a large number of experiments that when the mass ratio of Fe and Mn is 1.9 to 2.1:1 (specifically, 1.9:1, 2.0:1, 2.1:1, etc.), the aluminum alloy can have both good strength, Plasticity, fluidity and aluminum-plastic bonding ability, if the ratio is too large, the plasticity of the aluminum alloy is relatively poor, and if the ratio is too small, the strength of the aluminum alloy is relatively poor and easy to crack.

The inventors of the present application have found through a large number of experiments that when the zinc content is in the range of 0.5wt% to 2wt% (specifically, such as 0.5wt%, 1.0wt%, 2.0wt%, etc.), a dense layer can be formed on the surface of the aluminum alloy. Oxide film to slow down the contact between magnesium and oxygen, thereby slowing down the burning of magnesium. If the zinc content is too low, the effect is not obvious. If the zinc content is too high, a brittle low melting point phase will be formed in the aluminum alloy, which will seriously affect the alloy. elongation.

The inventors of the present application have found through a large number of experiments that the content of titanium and chromium (ie Cr\Ti) ranges from 0.1wt% to 0.3wt% (specifically, such as 0.1wt%, 0.15wt%, 0.2wt%, 0.25wt%, 0.3wt%, etc. ), it can better refine the grains of the aluminum alloy and increase the plasticity of the alloy. If the content of titanium and chromium is too low, the effect of refining the grains is not obvious, and the elongation of the aluminum alloy is low; if the content of titanium and chromium is too high, the aluminum alloy will The segregation of the alloy composition will also reduce the elongation of the aluminum alloy.

According to embodiments of the present invention, the specific content of aluminum in the aluminum alloy may be 84.12 wt %, 85 wt %, 88 wt %, 90 wt %, 93.92 wt %, and the like.

According to some specific embodiments of the present application, based on the total mass of the aluminum alloy, in terms of mass percentage, the aluminum alloy includes: 6wt%-7wt% of Mg; 1wt%-1.5wt% of Fe; 0.48wt%～ 0.79wt% Mn, and Fe/Mn is (1.9～2.1): 1; 0.8wt%～1.5wt% Zn; 0.1wt%～0.3wt% Cr\Ti; and 88.91wt%～91.62wt% aluminum. Therefore, the aluminum alloy has better strength, elongation, fluidity, and aluminum-plastic bonding force, and is more suitable for preparing mobile phone middle frames, meeting various usage requirements of mobile phone middle frames, and can be formed and processed by die casting. Simple, easy to implement, and low cost.

According to the embodiments of the present application, the impurity content in the aluminum alloy is less than 0.2 wt %. Specifically, since the purity of the raw materials is difficult to reach 100%, and impurities are likely to be introduced during the preparation process, aluminum alloys usually contain inevitable impurities (specifically such as Cu, Ni, Zr, Ag, Sr, Sn, S etc.), in this application, the content of impurities in the aluminum alloy is less than 0.2wt%, specifically (0.18wt%, 0.15wt%, 0.1wt%, 0.05wt%, etc.) The properties meet the requirements and will not have a negative impact on the aluminum alloy.

According to the embodiments of the present application, the aluminum alloy does not contain silicon element. Specifically, the die-casting aluminum alloy products need to be expanded by T treatment before nano-injection. If the aluminum alloy contains elemental silicon, the silicon element is not easily dissolved and remains on the surface of the aluminum alloy after the T treatment, which will seriously affect the aluminum-plastic bonding force of the aluminum alloy. , and the insoluble silicon particles may fall into the T treatment tank and contaminate the tank liquid during the T treatment. However, the applied aluminum alloy does not contain silicon, so that better aluminum-plastic bonding force can be obtained, and at the same time, the risk of silicon contamination of the T treatment bath can be avoided.

According to some specific embodiments of the present application, the aluminum alloy may be composed of the following components: 4wt% to 9wt% of Mg; 1wt% to 3wt% of Fe; 0.48wt% to 1.58wt% of Mn, and Fe and Mn The mass ratio is (1.9～2.1): 1; 0.5wt%～2wt% of Zn; 0.1wt%～0.3wt% of Cr\Ti, the Cr\Ti includes at least one of Cr and Ti; and the balance of aluminum.

According to other specific embodiments of the present application, the aluminum alloy may be composed of the following components: 6wt%-7wt% of Mg; 1wt%-1.5wt% of Fe; 0.48wt%-0.79wt% of Mn, and Fe/ Mn is (1.9～2.1): 1; 0.8wt%～1.5wt% of Zn; 0.1wt%～0.3wt% of Cr\Ti; and the balance of aluminum.

According to the embodiments of the present application, in order to obtain better performance, the grain size of the above-mentioned aluminum alloy is between 10 and 25 microns, specifically 10 microns, 15 microns, 20 microns, 25 microns, and the like. When the grain size of the aluminum alloy is within this range, the aluminum alloy can have a better elongation rate, and has better anti-drop performance when applied to products such as the middle frame of a mobile phone.

According to the embodiments of the present application, the yield strength of the aluminum alloy may be greater than 160 MPa, specifically 160 to 280 MPa (such as 160 MPa, 165 MPa, 170 MPa, 175 MPa, 180 MPa, 185 MPa, 190 MPa, 195 MPa, 200 MPa, 205 MPa, 210 MPa, 215 MPa, 220 MPa, 225 MPa , 230MPa, 235MPa, 240MPa, 245MPa, 250MPa, 260MPa, 270MPa, 80MPa, etc.), the elongation is greater than 4%, specifically 4 to 10% (such as 4.1%, 4.5%, 5%, 5.5%, 6%, 6.2% , 6.5%, 6.8%, 7.0%, 7.1%, 7.3%, 7.5%, 7.6%, 7.8%, 7.9%, 8.0%, 8.2%, 8.5%, 8.8%, 9.0%, 9.2%, 9.5%, 9.8 %, 10%, etc.), the aluminum-plastic bonding force is greater than 25MPa, specifically 25 to 50MPa (such as 25MPa, 26MPa, 27MPa, 28MPa, 29MPa, 30MPa, 31MPa, 32MPa, 33MPa, 34MPa, 35MPa, 36MPa, 37MPa, 38MPa , 39MPa, 40MPa, 45MPa, 50MPa, etc.), and the fluidity is greater than 1200mm, specifically 1200 to 1600mm (such as 1200mm, 1250mm, 1300mm, 1350mm, 1400mm, 1450mm, 1500mm, 1550mm, 1600mm, etc.). Therefore, the aluminum alloy has good strength, anti-drop performance and aluminum-plastic bonding force at the same time, and is very suitable for preparing a middle frame of a mobile phone.

In another aspect of the present application, the present application provides a method of making the aforementioned aluminum alloy. According to the embodiment of the present application, the method includes: after heating and melting aluminum-containing raw materials, adding magnesium-containing raw materials, iron-containing raw materials, manganese-containing raw materials, zinc-containing raw materials and Cr\Ti-containing raw materials to obtain aluminum alloy liquid; The aluminum alloy liquid is refined and degassed and poured to obtain the aluminum alloy. The method is simple and convenient to operate, easy to implement industrially, and the obtained aluminum alloy has good mechanical properties, plastic workability, aluminum-plastic bonding force and fluidity.

According to the embodiments of the present application, the temperature for heating and melting the aluminum-containing raw materials is 700-750°C, specifically 710°C-730°C (such as 710°C, 720°C, 730°C, etc.); heating and melting magnesium-containing raw materials and iron-containing raw materials , The temperature of manganese-containing raw materials, zinc-containing raw materials and Cr\Ti-containing raw materials is 680℃-710℃ (such as 680℃, 690℃, 700℃, 710℃, etc.).

According to the embodiments of the present application, the aluminum-containing raw materials, magnesium-containing raw materials, iron-containing raw materials, manganese-containing raw materials, zinc-containing raw materials, and Cr\Ti-containing raw materials may be capable of providing various elements required for preparing the aluminum alloy of the present application. The material can be an alloy or pure metal containing the above elements, as long as the composition of the aluminum alloy obtained after the added aluminum alloy raw material is smelted is within the above range. In some specific embodiments, the aluminum alloy raw material may include pure Al or Al alloy, pure Mg or Mg alloy, pure Fe or Fe alloy, pure Mn or Mn alloy, pure Zn or Zn alloy, pure Cr or Cr alloy, pure Ti or Ti alloy. In other specific embodiments, the aluminum alloy raw materials include pure Al, pure Mg, pure Zn, Al-Fe alloy, Al-Mn alloy, Al-Ti alloy and Al-Cr alloy.

According to the embodiment of the present application, the refining includes adding a refining agent to the aluminum alloy liquid and stirring to achieve refining and degassing; the refining agent is at least one of hexachloroethane, zinc chloride, manganese chloride and potassium chloride One, the refining temperature can be 720-740°C (eg, 720°C, 730°C, 740°C, etc.).

According to the embodiments of the present application, the pouring temperature may be 680-720°C (eg, 680°C, 690°C, 700°C, 710°C, 720°C, etc.).

According to the embodiments of the present application, the method for preparing an aluminum alloy may further include performing die-casting on the aluminum alloy ingot obtained by casting. Specifically, in the die casting, the aluminum alloy ingot is remelted into an aluminum alloy liquid at a temperature of 680-720°C (such as 680°C, 690°C, 700°C, 710°C, 720°C, etc.), and a certain amount of The aluminum alloy liquid is poured into the pressure chamber of the die-casting machine, and then the aluminum alloy is hydraulically injected into the metal mold by the shot hammer to form the product.

In yet another aspect of the present application, the present application provides a middle frame of a mobile phone. According to an embodiment of the present application, at least a part of the middle frame of the mobile phone is formed of the aforementioned aluminum alloy. The middle frame of the mobile phone has good strength and anti-drop performance, and the aluminum alloy and plastic in it have strong bonding force, and the plastic filled in the antenna slot is firmly bonded, not easy to fall off, and has good performance and feel. , the middle frame of the mobile phone can be conveniently formed by die-casting, which greatly reduces the dependence on equipment and the cost.

In yet another aspect of the present application, the present application provides a mobile phone. According to an embodiment of the present application, the mobile phone includes the aforementioned middle frame of the mobile phone. The mobile phone has all the features and advantages of the aforementioned middle frame of the mobile phone, which will not be repeated here.

Those skilled in the art can understand that, in addition to the mobile phone middle frame described above, the mobile phone also has structures and components that a conventional mobile phone must have, such as a display screen, a touch screen, a battery back cover, a cover plate, a fingerprint recognition module Groups, camera modules, sound systems, etc., will not be repeated here.

Embodiments of the present invention are described in detail below.

Example

After heating pure Al to 710℃-730℃ and melting, adding pure Mg, pure Zn, Al-Fe alloy, Al-Mn alloy, Al-Ti alloy and Al-Cr alloy, heating and melting at 680℃-710℃, Obtaining an aluminum alloy liquid; adding a refining agent to the aluminum alloy liquid and stirring to achieve refining and degassing, and pouring at 680-720 ° C to obtain an aluminum alloy ingot whose composition is listed in Table 1 below, respectively The ingot is melted, and the molten aluminum alloy is cast into the metal mechanics test sample mold by means of die-casting equipment to obtain the aluminum alloy test sample. The molten aluminum alloy is cast into a metal flow spiral mold by a die-casting equipment to obtain a spiral test sample marked with a length.

Table 1

Performance Testing:

Aluminum alloy tensile test:

Refer to the national standard GBT 228.1-2010 Tensile Test of Metal Materials Part 1: Test method at room temperature. During the process of forming the tensile sample (ie die casting), observe the tensile sample with the naked eye to determine whether the product has cracks and the specific shape of the die casting. and dimensions refer to Figure 1 (wherein, the meaning of W, C, T, G, R, B and the specific value of J refer to Table 2, L represents the total length, specifically 170mm, A represents the parallel length, specifically 65mm) and Table 2 below, The tensile properties were tested using an electronic universal testing machine model CMT5105, the gauge length was 50 mm, the loading rate was 2 mm/Min, and the yield strength and elongation were recorded. The test results are shown in Table 3 below.

Table 2

Aluminum alloy fluidity test:

The spiral sample is formed by die casting method (metal fluidity spiral mold mosquito coil mold) (see Figure 2 for the structural diagram), and the length is recorded according to the scale at the end of the sample. The test results are shown in Table 3 below.

Aluminum-plastic bonding strength test of aluminum alloy:

The aluminum alloy test sample with the thickness, width and length of 3mm*12mm*40mm is subjected to T treatment to expand the hole, and the aluminum alloy sample after T treatment is put into the injection mold for injection molding. The aluminum-plastic sample after injection molding (refer to Figure 3 for the structural schematic diagram, in which 1 is aluminum alloy and 2 is plastic) is subjected to a pulling force test, the aluminum-plastic bonding area is 36mm ² , the pulling force speed is 5.0mm/min, and the test data are recorded. , the schematic diagram of the sample structure after fracture is shown in Figure 4, and the test results are shown in Table 3 below.

Grain size test:

Select the die-casting tensile sample and select the cross section. The grinding, polishing and corrosion of the sample refer to GB/T13298. Under the conventional metallographic microscope, the diameter of the grain is measured. The text in the corner is the relevant information of the metallographic microscope equipment, which has no effect on the observation of grains and the measurement of grain size).

Impurity content test:

The content of each component in the aluminum alloys obtained in the above Examples 1-24 was tested by laser direct reading spectroscopy, and the impurity content in all the aluminum alloys was below 0.2%.

Test Results:

table 3

Note: - means no cracking.

It can be seen from the above test results that the fluidity, aluminum-plastic bonding force, yield strength and elongation of the aluminum alloys of Examples 1-24 of the present application are all good. According to Comparative Examples 1-12, when the aluminum alloy contains silicon, the aluminum-plastic bonding force decreases significantly; when the magnesium content is small, the iron-manganese ratio is small, the zinc content is high, or the titanium-chromium content is high, the aluminum alloy sample cracks ; When the magnesium content is more, the iron content is more, the iron-manganese ratio is larger, the zinc content is less or the titanium-chromium content is less, the elongation of the aluminum alloy is lower and the plasticity is poor; and when the iron content is less, the strength of the aluminum alloy is higher. Low, when the zinc content is low, the fluidity is poor.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations to the present application. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (10)

1. An aluminum alloy, characterized in that the aluminum alloy comprises, in mass percent based on the total mass of the aluminum alloy:

4 to 9 weight percent of Mg;

1-3 wt% of Fe;

0.48 to 1.58 weight percent of Mn;

0.5 wt% -2 wt% of Zn;

0.1 wt% -0.3 wt% of Cr \ Ti, wherein the Cr \ Ti comprises at least one of Cr and Ti; and

84.12 to 93.92 weight percent of aluminum.

2. The aluminum alloy of claim 1, wherein the aluminum alloy comprises, in mass percent based on the total mass of the aluminum alloy:

6 to 7 weight percent of Mg;

1 to 1.5 weight percent of Fe;

0.48 to 0.79 weight percent of Mn;

0.8 wt% -1.5 wt% of Zn;

0.1 to 0.3 weight percent of Cr/Ti; and

88.91 wt% to 91.62 wt% of aluminum.

3. The aluminum alloy according to claim 1 or 2, wherein the mass ratio of Fe to Mn in the aluminum alloy is (1.9-2.1): 1.

4. the aluminum alloy of claim 1, wherein the aluminum alloy has an impurity content of less than 0.2 wt.%.

5. The aluminum alloy of claim 1, wherein the aluminum alloy does not contain elemental silicon.

6. The aluminum alloy of any of claims 1-5, wherein the grain size is between 10 and 25 micrometers.

7. The aluminum alloy of any one of claims 1 to 5, wherein at least one of the following conditions is satisfied: the yield strength is more than 160MPa, preferably 160-280 MPa, the elongation is more than 4%, preferably 4-10%, the aluminum-plastic bonding force is more than 25MPa, preferably 25-50 MPa, and the fluidity is more than 1200mm, preferably 1200-1600 mm.

8. A method of making the aluminum alloy of any of claims 1-7, comprising:

heating and melting an aluminum-containing raw material, and adding a magnesium-containing raw material, an iron-containing raw material, a manganese-containing raw material, a zinc-containing raw material and a Cr/Ti-containing raw material to obtain an aluminum alloy liquid;

and refining, degassing and casting the aluminum alloy liquid to obtain the aluminum alloy.

9. A mobile phone middle frame, characterized in that at least one part of the mobile phone middle frame is composed of the aluminum alloy of any one of claims 1-7.

10. A cellular phone comprising the cellular phone center of claim 9.

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