KR100909699B1 - Aluminum alloy with improved impact energy and extrusion made from the same - Google Patents

Abstract

An aluminum alloy with improved impact energy and an extrusion made by the same are provided to absorb shock energy effectively and improve mechanical properties such as ultimate tensile strength and yield strength by including beryllium. An aluminum alloy with improved impact energy comprises silicon 0~0.1 weight%, iron 0~0.1 weight%, copper 1.5~2.5 weight%, magnesium 1.8~2.2 weight%, zinc 7.6~8.4 weight%, zirconium 0.11~0.15 weight%, titanium 0.02~0.08 weight%, scandium 0.08~0.12 weight%, and beryllium 0.05~0.1 weight%. The aluminum alloy is improved in shock energy by the beryllium.

Description

Aluminum alloy with improved impact energy and Extrusion made from the same

The present invention relates to an aluminum alloy, and more particularly to an aluminum alloy containing scandium (Sc).

As the importance of energy saving and environmental preservation increases in modern society, research on lightweight materials is being conducted to reduce the weight of transportation machinery such as aircraft and automobiles, and aluminum alloy is typically used as the lightweight material. Aluminum alloy is light and has high specific strength. It is widely used for structural materials and construction materials such as aircrafts and vehicles that require light weight and high strength.In recent years, aluminum alloys have been used for electrical and electronic parts, leisure products, and automobiles for communication equipment, semiconductors and computers. It is also used in small products such as some components of the trend is increasing the range of use.

Aluminum alloys can be broadly divided into casting aluminum alloys and processing aluminum alloys. The aluminum alloys for processing are divided into high-strength alloys mainly composed of duralumin-based Al-Cu-Mg and Al-Zn-Mg. It can be divided into the corrosion-resistant alloy system mainly having Al-Mn system and Al-Mg-Si system. In addition, aluminum alloys are distinguished by four digit numbers by the Association of Aluminum, which is used from 1000 series numbers to 8000 series numbers, among which 2000 series and 7000 series correspond to high strength alloys.

Meanwhile, in order to use aluminum alloy in a vehicle frame or a bumper system for a vehicle, it is necessary to effectively absorb impact energy as well as ultralight and high strength characteristics. In order to improve the impact energy of the aluminum alloy, only a heat treatment method or a method of manufacturing the aluminum alloy into a specific type of structure is used (Korean Patent Publication No. 10-1992-7004042, Korean Patent Publication No. 10-2003- 0090048, Korean Patent Laid-Open Publication No. 10-2000-0023821), by adding a specific component, especially beryllium (Be) to the aluminum alloy is almost no technology to improve the impact energy of the aluminum alloy itself.

The present invention has been made to solve the above problems, and an object thereof is to provide an aluminum alloy having an improved impact energy and excellent mechanical properties such as ultimate tensile strength, yield strength and the like, and an extruded material manufactured therefrom.

The object of the present invention is an aluminum alloy containing scandium (Sc), comprising silicon (Si), iron (Fe) and beryllium (Be), with a silicon content greater than zero and based on the total weight of the total aluminum alloy; It can be achieved by providing an aluminum alloy with improved impact energy by beryllium, characterized in that it is 0.1 or less, iron content is greater than 0 and 0.1 or less, beryllium content is 0.05 or more and 0.1 or less.

The aluminum alloy of the present invention may further include magnesium (Mg) and zinc (Zn), and the magnesium content is 1.8 or more and 2.2 or less, and the zinc content is 7.6 or more and 8.4 or less based on the total weight of the aluminum alloy. Preferably, the weight ratio of zinc to magnesium is 3.8 to 4.0. In addition, the content of scandium in the aluminum alloy of the present invention is characterized in that 0.08 or more and 0.12 or less based on the total weight of the aluminum alloy.

The aluminum alloy of the present invention may optionally further include at least one of copper (Cu), zirconium (Zr), or titanium (Ti), and has a copper content of 1.5 or more and 2.5 based on the total weight of the aluminum alloy. Hereinafter, the zirconium content is 0.11 or more and 0.15 or less, the titanium content is characterized in that 0.02 or more and 0.08 or less. In addition, the aluminum alloy of the present invention may further include manganese (Mn) or chromium (Cr) as a trace element.

Another above object of the present invention can be achieved by providing an extruded material made from the aluminum alloy of the present invention.

The rectangular extrusion material manufactured from the aluminum alloy of the present invention is characterized in that the impact energy (Impact Energy) is 5.75 ~ 6.68J, preferably characterized in that the propagation energy constituting the impact energy is 2.80 ~ 3.28J. In addition, the ultimate tensile strength (Ultimate Tensile Strength) of the rectangular extrusion material has a range of 761.5 ~ 764.6 Mpa (megapascals).

Circular extrusion material produced from the aluminum alloy of the present invention is characterized in that the impact energy (Impact Energy) is 6.60 ~ 7.31J, preferably characterized in that the propagation energy constituting the impact energy is 3.24 ~ 3.43J.

The aluminum alloy containing scandium (Sc) according to the present invention has improved impact energy by beryllium added in an appropriate composition range, and at the same time, has excellent characteristics such as ultimate tensile strength and yield strength as mechanical properties. Particularly, the extruded material manufactured from the aluminum alloy according to the present invention has a mechanical property that the impact energy is increased by 15.8 to 37.9% and the ultimate tensile strength is improved compared to the extruded material made from the aluminum alloy that does not contain beryllium. It can be used in the impact energy absorbing member for vehicles, in particular the extruded material for the automobile frame, the bumper system for the vehicle that requires the properties of and the ability to effectively absorb the impact energy.

The present invention relates to an aluminum alloy containing scandium (Sc), and more particularly to an aluminum alloy with improved impact energy by beryllium.

An aluminum alloy containing scandium (Sc) of the present invention, comprising silicon (Si), iron (Fe), and beryllium (Be), wherein the silicon content is greater than 0 and less than or equal to 0.1, based on the total weight of the total aluminum alloy; It is characterized in that the iron content is greater than 0 and 0.1 or less, and the beryllium content is 0.05 or more and 0.1 or less.

Iron, which is one component of the aluminum alloy of the present invention, increases grain boundary brittleness of the aluminum alloy and prevents sintering of the mold and the melt during the casting process, but when it exceeds 0.2% by weight, the elongation of the aluminum alloy is reduced to 0.2. It is preferable to limit the weight percentage or less. In addition, silicon plays an important role in increasing grain boundary brittleness, improving castability, and improving mechanical properties of aluminum alloys. However, when silicon exceeds 0.2% by weight, silicon reduces the elongation of aluminum alloys. desirable.

In the aluminum alloy of the present invention, the content of scandium is not particularly limited, but is preferably 0.08 or more and 0.12 or less based on the total weight of the aluminum alloy. Scandium, which is a component of the aluminum alloy of the present invention, serves to help nucleation and atomization of the precipitated particles, and shows an effect of refining grains as the scandium content increases. However, considering the increase in manufacturing cost due to the addition of expensive scandium and the efficiency of grain refinement compared to the addition of scandium, the scandium content is preferably 0.08 to 0.12% by weight.

Beryllium, which is a component of the aluminum alloy of the present invention, generally inhibits the formation of needle-like acicular Al ₃ Fe in the aluminum alloy and improves ductility by forming a square Be ₂ Fe phase, and ii) corrosion. 억제) to improve the corrosion resistance ⅲ) inhibits the oxidation of magnesium components ⅳ) plays a role in inhibiting the aging of room temperature.

In the present invention, beryllium serves to improve impact energy while maintaining the ultimate tensile strength and yield strength of the aluminum alloy at a constant level. In more detail, as the content of beryllium increases, the shape of the Fe-Cu compound in the aluminum alloy is changed into a hieroglyphic or circular form, and it is estimated that the impact energy is improved, and addition of aluminum by the addition of beryllium It appears that the propagation path of cracks in the alloy is altered and the propagation energy is significantly increased, resulting in improved impact energy. The content of beryllium in the present invention is not particularly limited, but is preferably characterized in that 0.05 to 0.1% by weight. If the content of beryllium is less than 0.05% by weight, the impact energy of the aluminum alloy may not be improved due to the addition of beryllium. If the content is more than 0.1% by weight, the increase of the impact energy of the aluminum alloy due to the addition of beryllium may be insufficient. It's not big, and beryllium is very expensive, so the economy can be bad.

The aluminum alloy of the present invention may further include magnesium (Mg) and zinc (Zn), and the magnesium content is 1.8 or more and 2.2 or less, and the zinc content is 7.6 or more and 8.4 or less based on the total weight of the aluminum alloy. Preferably, the weight ratio of zinc to magnesium is 3.8 to 4.0.

Magnesium and zinc, which are components of the aluminum alloy of the present invention, serve to increase the strength of the aluminum alloy by forming MgZn ₂ on eta (η) during the aluminum alloy casting process. In general, the atomic ratio of zinc to magnesium is in the range of 2 to 2.5 (from 5.42 to 6.67 for the weight ratio of zinc to magnesium). However, when MgZn ₂ in eta (η) is over-formed, the grain boundary brittleness and grain boundary stress corrosion of aluminum alloy Since the resistance is lowered and the zinc remaining without binding with magnesium acts as an impurity to generate cracks during bending, in the present invention, the weight ratio of zinc to magnesium is preferably 3.8 to 4.0.

The aluminum alloy of the present invention may further include copper (Cu), characterized in that the copper content of 1.5 or more and 2.5 or less based on the total weight percent of the aluminum alloy.

Copper, which is a component of the aluminum alloy of the present invention, serves to increase the strength of the aluminum alloy, but if it is added too much, the ductility and corrosion resistance of the aluminum alloy is deteriorated, so it is preferably added at 1.5 to 2.5% by weight.

The aluminum alloy of the present invention may further include zirconium (Zr), and the zirconium content is 0.11 or more and 0.15 or less based on the total weight of the aluminum alloy.

Zirconium, which is a component of the aluminum alloy of the present invention, forms a ZrAl ₃ intermetallic compound during the aluminum alloy casting process, acts as a nucleation site of primary aluminum, refines crystals, and suppresses recrystallization. It is preferable to add it at 0.11 to 0.15 weight%.

The aluminum alloy of the present invention may further include titanium (Ti), characterized in that the titanium content of 0.02 or more and 0.08 or less based on the total weight of the aluminum alloy.

Titanium, which is a component of the aluminum alloy of the present invention, forms TiAl ₃ during the aluminum alloy casting process to act as nucleation site of primary aluminum and to refine the crystal, but when the amount is excessive, the grain is coarse. It is preferable to add 0.02 to 0.08% by weight since it may adversely affect the mechanical properties.

In addition, the aluminum alloy of the present invention may further include manganese (Mn) or chromium (Cr) as a trace element in addition to the above components.

The aluminum alloy of the present invention is made of aluminum as scandium (Sc), silicon (Si), iron (Fe), beryllium (Be), and the balance as an essential component, preferably magnesium (Mg) and zinc (Zn). ), Copper (Cu), zirconium (Zr), or titanium (Ti) may optionally further include one or more, more preferably further comprises manganese (Mn) or chromium (Cr) as a trace element. Can be. Therefore, the best composition ratio of the aluminum alloy with improved impact energy by beryllium according to the present invention is less than 0.1% by weight of silicon (Si), 0.2% by weight of iron (Fe), 1.5 to 2.5% by weight of copper (Cu), magnesium (Mg) ) 1.8-2.2 wt%, zinc (Zn) 7.6-8.4 wt%, zirconium (Zr) 0.11-0.15 wt%, titanium 0.02-0.08 wt%, scandium (Sc) 0.08-0.12 wt%, beryllium (Be) 0.05- 0.1 wt%, manganese (Mn) or chromium (Cr) as trace elements, and aluminum as balance.

The aluminum alloy of the present invention is manufactured using standard procedures known to those skilled in the art. As an example of casting the aluminum alloy of the present invention, based on aluminum, 0.1 wt% or less of silicon (Si), 0.2 wt% or less of iron (Fe), 1.5 to 2.5 wt% of copper (Cu), and magnesium (Mg) 1.8 ~ 2.2% by weight, zinc (Zn) 7.6-8.4%, zirconium (Zr) 0.11-0.15%, titanium 0.02-0.08%, scandium (Sc) 0.08-0.12%, beryllium (Be) 0.05-0.1% After adding%, molten aluminum is prepared, and slag is removed, followed by tapping. In addition, the aluminum molten metal may further include a degassing treatment and a particle refiner treatment.

Another aspect of the invention relates to an extruded material produced by an aluminum alloy with improved impact energy by beryllium. The extruded material of the present invention can be produced by homogenizing, extruding, solutionizing, and artificial aging treatment of the aluminum alloy cast material of the present invention including an appropriate range of beryllium by a known method, wherein the extruded material does not contain beryllium. Compared with the extruded material manufactured by the present invention, impact energy is significantly increased, and ultimate tensile strength and yield strength are also increased.

Extruded material of the present invention is not significantly limited in shape, of which the rectangular extruded material is characterized in that the impact energy (Impact Energy) is 5.75 ~ 6.68J, preferably the propagation energy constituting the impact energy is 2.80 ~ 3.28J It is characterized by. In addition, the ultimate tensile strength (Ultimate Tensile Strength) of the rectangular extrusion material has a range of 761.5 ~ 764.6 Mpa (megapascals). In addition, the circular extrusion material manufactured from the aluminum alloy of the present invention is characterized in that the impact energy (Impact Energy) is 6.60 ~ 7.31J, preferably characterized in that the propagation energy constituting the impact energy is 3.24 ~ 3.43J. .

In more detail, the impact energy of the rectangular extruded material made of the aluminum alloy of the present invention (impact energy) is characterized in that 15.8 ~ 34.5% increase than the impact energy of the rectangular extruded material made of an aluminum alloy containing no beryllium, Among them, the radio wave energy constituting the impact energy is characterized by an increase of 136 ~ 176%. On the other hand, the impact energy of the circular extruded material made of the aluminum alloy of the present invention (impact energy) is characterized in that 24.6 ~ 37.9% increase than the impact energy of the circular extruded material made of aluminum alloy does not contain beryllium, the impact The propagation energy constituting the energy is characterized by an increase of 302 ~ 325%. In addition, the ultimate tensile strength (Ultimate Tensile Strength) of the rectangular extruded material made of the aluminum alloy of the present invention is characterized by an increase of 2.4 ~ 2.9% than the ultimate tensile strength of the rectangular extruded material made of an aluminum alloy containing no beryllium. The remarkable improvement of the impact energy in the extruded material made of the aluminum alloy of the present invention is mainly due to the increase in the propagation energy, and it can be estimated from the above results that beryllium plays a role of changing the propagation path of the crack in the aluminum alloy.

Hereinafter, the present invention will be described in detail by way of examples. However, the following examples are merely to illustrate the invention, the scope of the present invention is not limited by the following examples.

<Example>

1.Manufacture of aluminum alloy

To investigate the mechanical properties of aluminum alloy with the addition of beryllium (Be) The aluminum alloy casting materials of Examples 1 to 2 and Comparative Example 1 having the composition as shown in Table 1 were prepared using a conventional method. That is, after adding the components shown in Table 1 to the 500kg crucible, the aluminum molten metal was prepared at a temperature of 740 ~ 800 ℃, degassing treatment, particle finer treatment. Thereafter, the slag was removed, followed by tapping to prepare an aluminum alloy having the composition shown in Table 1, and a cast material in the form of a billet (Billet) was manufactured using a casting machine.

division Chemical composition (wt%) Al Si Fe Cu Mg Zn Zr Ti Sc Be Example 1 Base 0.044 0.085 2.227 2.043 7.977 0.137 0.057 0.0988 0.056 Example 2 Base 0.044 0.085 2.227 2.043 7.977 0.137 0.057 0.0988 0.105 Comparative Example 1 Base 0.032 0.068 2.192 2.019 7.88 0.1278 0.053 0.0978 -

As shown in Table 1, the weight ratio of zinc to magnesium in Examples 1 and 2 and Comparative Example 1 is about 3.9, which effectively forms the MgZn ₂ on eta (η) phase in the aluminum alloy. However, the weight% of the zinc and magnesium of Examples 1 to 2 belonging to the present invention is 10.02% by weight of the total aluminum alloy, which is somewhat higher than 9.899% by weight of Comparative Example 1, and thus MgZn _{2 in} eta (η) phase. The strength increasing effect by is expected to be greater in Examples 1 and 2 of the present invention.

2. Made from aluminum alloy Of extruded material  Mechanical properties

Homogenized (465 degreeC, 20 hours), extrusion (the temperature of a billet is 300 degreeC), solution (460-470 degreeC, 2 hours and 30 minutes), artificial, the aluminum alloy casting of Comparative Examples 1 and 2 Tensile and impact tests were conducted to investigate the mechanical properties of the rectangular extruded material (76 mm × 32 mm) and the circular extruded material (diameter = 80 mm) obtained by aging treatment (121 ° C., 24 hours).

Experimental Example  1. Made from aluminum alloy Of extruded material  Tensile test

Five specimens were prepared for the rectangular and circular extruded materials in accordance with the American Society for Testing and Materials (ASTM) standards, and tensile tests were conducted in the same direction as the extrusion direction (ASTM E8, Standard Test Methods for Tension Testing of Metallic Materials. Ultimate Tensile Strength, Yield Strength, and Elongation, which are mechanical properties, were obtained from the average of five specimens. Table 2 shows the tensile test results of the rectangular extrusion material, Table 3 shows the tensile test results of the circular extrusion material.

division Mechanical properties Ultimate tensile strength, MPa Yield strength, MPa Elongation,% Example 1 761.5 725.1 8.1 Example 2 764.6 726.8 8.6 Comparative Example 1 743 682 14.2

division Mechanical properties Ultimate tensile strength, MPa Yield strength, MPa Elongation,% Example 1 732 694 9.8 Example 2 730 689 11.4 Comparative Example 1 724 677 9.5

As shown in Tables 2 and 3, the ultimate tensile and yield strengths of extruded materials made from aluminum alloys containing beryllium (Examples 1 to 2) are the extremes of extruded materials made from aluminum alloys containing beryllium (Comparative Material 1). Greater than tensile and yield strengths. In particular, in the case of the rectangular extruded material, the ultimate tensile strength of the extruded material made from the aluminum alloy containing beryllium increases by 2.4 to 2.9% from the ultimate tensile strength of the extruded material made from the aluminum alloy containing no beryllium, and the increase effect is the circular extruded material. Larger.

On the other hand, the elongation was lower than the rectangular extruded material made of aluminum alloy containing no beryllium in the rectangular extruded material made of aluminum alloy containing beryllium. These results show a general tendency of plastic behavior in which tensile strength and elongation are inversely proportional. However, the elongation was increased in the circular extruded material made of aluminum alloy containing beryllium, rather than the circular extruded material made of aluminum alloy containing no beryllium.

In addition, the ultimate tensile strength of the rectangular extruded material exhibited a higher value than the ultimate tensile strength of the circular extruded material, which is considered to be the result of the rectangular extruded material having a higher extrusion ratio than the circular extruded material. Extrusion ratio is defined as the area ratio of the inlet and outlet of the extrusion die, the extrusion ratio was 17 for the rectangular extrusion material, the extrusion ratio was 8 for the circular extrusion material.

Experimental Example  2. Made from aluminum alloy Of extruded material  Impact test

Five specimens were prepared for each of the extruded materials in accordance with the ASTM (American Society for Testing and Materials) for each rectangular extruded material and the circular extruded material, and the impact test was performed after forming notches perpendicular to the extrusion direction (ASTM E23, Standard). Test Methods for Notched Bar Impact Testing of Metallic Materials). In the impact test, the mechanical energy values, starting energy, propagation energy, and impact energy, were shown as average values of five specimens. Table 4 shows the impact test results of the rectangular extrusion material, Table 5 shows the tensile test results of the circular extrusion material.

division Starting energy, J Radio energy, J Impact energy, J % Increase for Comparative Example 1,% Radio wave energy Impact energy Example 1 2.95 2.80 5.75 136 15.8 Example 2 3.40 3.28 6.68 176 34.5 Comparative Example 1 3.79 1.19 4.98 - -

division Starting energy, J Radio energy, J Impact energy, J % Increase for Comparative Example 1,% Radio wave energy Impact energy Example 1 3.36 3.24 6.60 302 24.6 Example 2 3.88 3.43 7.31 325 37.9 Comparative Example 1 4.49 0.81 5.30 - -

In Table 4 and Table 5, the starting energy is the energy before the crack is generated in the notch, the propagating energy is the energy before the crack propagates and the fracture occurs, and the impact energy is the sum of the starting energy and the propagating energy. Is defined. Therefore, the starting energy is influenced by the tensile strength and ductility of the material, and the propagation energy is influenced by the propagation path of the crack.

As shown in Table 4 and Table 5, the extruded material produced from the aluminum alloy containing beryllium showed similar values of the starting energy and the propagation energy. On the other hand, in the extruded material made from aluminum alloy containing no beryllium, the starting energy showed a value much higher than the propagation energy.

According to Table 4, the rectangular extruded material made from aluminum alloy containing beryllium increased the propagation energy value by 136 ~ 176% compared to the rectangular extruded material made from aluminum alloy containing no beryllium, and the impact due to the increase of the propagated energy Energy increased by 15.8-34.5%. In addition, according to Table 5, the circular extruded material made from aluminum alloy containing beryllium increased the propagation energy value by 302 ~ 325% compared with the circular extruded material made from aluminum alloy containing no beryllium, Due to the impact energy also increased by 24.6 ~ 37.9%, the increase was more significant than the rectangular extrusion.

From Table 4 and Table 5, it can be seen that beryllium improves the propagation energy of the aluminum alloy and, as a result, improves the impact energy of the aluminum alloy.

3. aluminum alloy Casting material  And crystalline form of homogeneous material

The crystal form of the aluminum alloy cast material of Examples 1 to 1 and Comparative Example 1 and the homogeneous material obtained by homogenizing, extruding, solutionizing, and artificial aging treatment were analyzed by scanning electron microscope (SEM).

Experimental Example  3. Scanning Electron Microscope Analysis of Aluminum Alloy Castings

1A and 1B are scanning electron micrographs of the aluminum alloy casting material of Comparative Example 1 (FIG. 1A is 200 times magnification and FIG. 1B is 1000 times magnification), and FIGS. 2A, 2B, and 2C are examples of Example 1 Scanning electron microscope analysis of the aluminum alloy casting material (Fig. 2a is 200 times magnification and Figs. 2b and 2c is 1000 times magnification). 3A, 3B and 3C are scanning electron micrographs of the aluminum alloy casting material of Example 2 (FIG. 3A is 200 times magnification and FIGS. 3B and 3C are 1000 times magnification).

As shown in FIGS. 1A, 2A, and 3A, in the case of a cast material, various phases forming grain boundaries are clearly distinguished, and grain boundaries are clearly observed. As the observed phase, MgZn ₂ and Al phases of the eta (η) phase are mainly observed. ₂ CuMg, T phase Al ₂ Mg ₃ Zn ₃ , Fe-Cu compound and the like. As shown in FIGS. 1B, 2B, 2C, 3B and 3C, as the content of beryllium increases, the shape of the Fe-Cu compound observed in gray has changed, especially containing about 0.1% by weight of beryllium. In the case of the aluminum alloy casting material of Example 2, the shape of the Fe—Cu compound is different from that of Comparative Example 1 and Example 1 and has a hieroglyphic or circular shape. From the above results, it can be seen indirectly that the addition of beryllium changes the shape of the Fe—Cu compound of the aluminum alloy, thereby improving the impact energy.

Experimental Example  4. Scanning Electron Microscope Analysis of Aluminum Alloy Homogeneous Materials

4A and 4B are scanning electron micrographs of the aluminum alloy homogeneous material of Comparative Example 1 (FIG. 4A is 200 times magnification and FIG. 4B is 1000 times magnification), and FIGS. 5A, 5B, and 5C are examples of Example 1. FIG. Scanning electron microscope analysis of the aluminum alloy homogeneous material (FIG. 5A is 200 times magnification and FIGS. 5B and 5C are 1000 times magnification). 6A, 6B and 6C are scanning electron micrographs of the aluminum alloy homogeneous material of Example 2 (FIG. 6A is 200 times magnification and FIGS. 6B and 6C are 1000 times magnification).

As shown in FIGS. 4A, 5A, and 6A, in the homogeneous material, many of the phases distributed at the grain boundary disappeared, and grain boundaries were not observed more clearly than the cast material, and fine eta (η) phases of MgZn ₂ were present in the grains. It can be confirmed that it is formed.

As shown in FIGS. 5B, 5C, 6B and 6C, in the case of the homogeneous materials of Examples 1 to 2, the shape of the Fe-Cu compound observed in gray was slightly larger than that of the cast material, It is judged to be due to the growth of the Fe-Cu compound generated. However, although the shape of the Fe-Cu compound in the homogeneous material is larger, the shape of the Fe-Cu compound is still maintained in a circular shape, and thus the impact energy may be improved by adding beryllium.

1A and 1B are scanning electron micrographs of the aluminum alloy casting material of Comparative Example 1 (FIG. 1A is 200 times magnification and FIG. 1B is 1000 times magnification), and FIGS. 2A, 2B, and 2C are examples of Example 1 Scanning electron microscope analysis of the aluminum alloy casting material (Fig. 2a is 200 times magnification and Figs. 2b and 2c is 1000 times magnification).

3A, 3B, and 3C are scanning electron micrographs of the aluminum alloy casting material of Example 2 (FIG. 3A is 200 times magnification and FIGS. 3B and 3C are 1000 times magnification).

4A and 4B are scanning electron micrographs of the aluminum alloy homogeneous material of Comparative Example 1 (FIG. 4A is 200 times magnification and FIG. 4B is 1000 times magnification), and FIGS. 5A, 5B, and 5C are examples of Example 1. FIG. Scanning electron microscope analysis of the aluminum alloy homogeneous material (FIG. 5A is 200 times magnification and FIGS. 5B and 5C are 1000 times magnification).

6A, 6B and 6C are scanning electron micrographs of the aluminum alloy homogeneous material of Example 2 (FIG. 6A has a 200 times magnification and FIGS. 6B and 6C have a 1000 times magnification).

Claims (9)

An aluminum alloy containing scandium (Sc), wherein the silicon (Si) content is greater than 0 and 0.1 or less, the iron (Fe) content is greater than 0 and 0.1 or less, and the copper (Cu) content is 1.5 or more and 2.5 or less, magnesium (Mg) content of 1.8 or more and 2.2 or less, zinc (Zn) content of 7.6 or more and 8.4 or less, zirconium (Zr) content of 0.11 or more and 0.15 or less, titanium (Ti) content of 0.02 or more And 0.08 or less, scandium (Sc) content of 0.08 or more and 0.12 or less, beryllium content of 0.05 or more and 0.1 or less. delete The aluminum alloy of claim 1, wherein the aluminum alloy has a weight ratio of zinc to magnesium of 3.8 to 4.0. delete delete delete delete The aluminum alloy of claim 3, wherein the aluminum alloy further includes manganese (Mn) or chromium (Cr) as a trace element. An extruded material made from the aluminum alloy of any one of claims 1, 3 or 8.

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