KR101889213B1 - Al-Mg-Si BASED ALLOY HAVING BLUE COLOR - Google Patents

Abstract

The present invention relates to a method of manufacturing a semiconductor device, which comprises, by weight%, Si of not less than 2 wt% and not more than 20 wt% Si, 5 wt% or more and 20 wt% or less of Mg and the remainder Al and unavoidable impurities, Al-Si-Mg-based alloys having an Al-Si-Mg-based alloy. The Al-Si-Mg based alloy has a uniform color as a whole and has excellent processability.

Description

Al-Si-Mg alloy having blue color (Al-Mg-Si BASED ALLOY HAVING BLUE COLOR)

The present invention relates to an Al-Si-Mg-based alloy having a blue color, more particularly, to an Al-Si-Mg-based alloy having a blue color and at the same time having excellent processability.

Aluminum or aluminum alloys (hereinafter referred to as aluminum alloys) are used in construction materials, household appliances, and machine parts because they can be made lighter in weight than steel materials and can meet energy conservation and resource saving requirements in a place where recycling is easy . As described above, the aluminum alloy is used in various ways due to its weight saving and economy, and various external materials for coping with the polymer resin by the metallic aesthetics of the aluminum alloy are also being studied in various ways.

On the other hand, the aluminum alloy has a problem that it is difficult to realize colors other than essential metallic colors (for example, silver, silver gray, etc.) due to the characteristics of the metals. Therefore, studies have been conducted to treat the surface of the aluminum alloy by using an anodizing process or the like, or to treat the surface of the aluminum alloy by cladding a metal having a color to the aluminum alloy.

Japanese Patent Application No. 2004-56912 discloses an aluminum alloy in which gray color is developed. However, in order to realize gray color, a pretreatment process and an anodic oxidation process have to be separately performed. In addition, .

Korean Patent Application No. 1997-012522 discloses an aluminum alloy having a milky white color on one side and a black gray on the other side. The milky white color and the black gray color embodied in the aluminum alloy are each coated on two anodized aluminum alloy, To form a color, and then they are bonded to each other. The aluminum alloy thus produced has an advantage in that the colors on both sides are different from each other, but the color is limited to only the surface, and only the brightness of milky white or black gray can be controlled. In addition, anodizing and aluminum alloy are separately bonded The process ratio is increased and the production efficiency is lowered.

Since the method of implementing the color of the aluminum alloy requires a separate process, the process efficiency is lowered and the color is realized by a separate process, which makes it difficult to uniformize the color. In addition, the color of the aluminum alloy can be controlled only by gray or the like, and the color is limited only to the surface of the aluminum alloy, so that when the outside is worn out, the color is removed and the color of the aluminum alloy itself is introduced to the outside .

In spite of various physical properties such as light weight and workability, the aluminum alloy has a limited range of use due to the difficulty in realizing color.

An object of the present invention is to provide a novel Al-Si-Mg-based alloy having a blue color without any additional surface treatment.

Another object of the present invention is to provide an Al-Si-Mg-based alloy comprising an outer portion having a blue color and an inner portion having an outer and uniform blue color.

Another object of the present invention is to provide an Al-Si-Mg-based alloy having excellent workability and light weight.

According to an aspect of the present invention, there is provided an Al-Si-Mg alloy, wherein the Al-Si-Mg alloy is contained in an amount of 2 wt% to 22 wt% Of Si, more than 4 wt% and not more than 19 wt% of Mg, and the balance Al and inevitable impurities, and the inside and the outside of the inside are continuously blue. Preferably, the Si content is 2.09 wt% or more to 21.1 wt% or less, and the Mg content is 4.49 wt% or more to 18.4 wt% or less.

The Al-Si-Mg-based alloy may have an average wavelength value of 420 nm to 460 nm. The Al-Si-Mg-based alloy may have a Luminosity factor (L, Hunter L) of 60 to 90 as defined in JIS Z-8730.

The Al-Si-Mg-based alloy may be provided to have a uniform blue color in the depth direction from the outside to the inside.

The Si content is 2 wt% or more to 7 wt% or less, and the Mg content is 5 wt% or more to 9 wt% or less. Preferably, when the thickness of the Al-Si-Mg-based alloy is 25 탆 or less, Si may be 2.09 wt% or more and 6.27 wt% or less, and Mg may be 5.43 wt% or more and 8.17 wt% or less.

The Al-Si-Mg-based alloy may have a compressive strength of 120 MPa or more and 280 MPa or less. In addition, the Al-Si-Mg-based alloy may have an elongation of 3% or more to 60% or less.

The Al-Si-Mg-based alloy may be applied as a frame provided to surround the outside of the display.

The Al-Si-Mg-based alloy may be clad with other metals.

When expressed in CIE L * a * b * chromaticity, L may be 70 to 85, a * may be -1 to 3, and b * may be -12 to -1.

Further, the rate of change of reflectance may be more than 10% in a wavelength range of 400 nm to 500 nm, and the rate of change of reflectance may be 10% to 30% preferably in a wavelength range of 400 nm to 500 nm.

According to another aspect of the present invention, the present invention provides an alloy having a composition represented by the following formula (1), wherein the inside of the outside and the outside are continuously blue.

[Chemical Formula 1]

Al _(100-xy) Si _x Mg _y

In Formula 1, 2? X? 20 and 5 < y? 20.

As described above, according to the present invention, it is possible to provide a novel Al-Si-Mg-based alloy having a blue color without any additional surface treatment.

Further, according to the present invention, it is possible to provide an Al-Si-Mg-based alloy having an outer surface having a blue color and an inner surface having an outer and uniform blue color.

Further, according to the present invention, it is possible to provide an Al-Si-Mg alloy having excellent workability and light weight.

1 is a view showing a clad structure of an Al-Si-Mg based alloy according to an embodiment of the present invention.
FIG. 2 is a view showing an Al-Si-Mg alloy in a display according to an embodiment of the present invention.
FIG. 3A is a photograph showing a side view of an Al-Si-Mg based alloy and pure Al steel according to an embodiment of the present invention.
FIG. 3B is a photograph showing a cross section of an Al-Si-Mg based alloy and pure Al steel according to FIG. 3A.
FIG. 4 is a device for measuring a spectrum for confirming a wavelength value of a steel according to an embodiment of the present invention.
FIG. 5 is a view showing a method for expressing a result measured by the apparatus of FIG. 4 as a numerical value.
6 is a photograph showing a method of confirming bending characteristics.
7 is a photograph showing the results of the bending characteristics shown in Table 2. Fig.
Figs. 8 and 9 are photographs showing the bending characteristics for the steel types shown in Table 2. Fig.
10 to 12 are photographs comparing colors of an Al-Si-Mg based alloy and an Al steel according to an embodiment of the present invention.
Fig. 13 is a state diagram of the composition range of the Al-Si-Mg-based alloy of the present invention.
14A is a diagram showing a method of calculating the L * a * b * colorimetric system, and FIG. 14B is a graph showing a CIE L * a * b * coordinate system for Table 3 using FIG. 14A.
15 is a graph showing the wavelengths for the reflectance for Table 3;
16 is a view showing the alloy color for Table 3. Fig.
17 is a graph showing the metal color of the Al-Si-Mg-based alloy according to the present invention.

The details of other embodiments are included in the detailed description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Hereinafter, the present invention will be described with reference to the drawings.

The Al-Si-Mg alloy according to one embodiment of the present invention contains Si in an amount of 2 wt% or more and 22 wt% or less, Mg in an amount of 4 wt% or more and 19 wt% or less, and the balance Al and inevitable impurities And the inside and the outside connected with each other continuously have a blue color. Preferably, the Si content is 2.09 wt% or more to 21.1 wt% or less, and the Mg content is 4.49 wt% or more to 18.4 wt% or less. In addition, the Al-Si-Mg-based alloy can be excellent in workability.

Metals have been developed mainly in terms of functional properties such as mechanical properties, and organic coatings, coloring, or surface techniques have been used in order to realize color on the surface while maintaining the mechanical properties of the metal. On the other hand, such an organic coating, coloring or surface technology requires additional processes and also causes environmental pollution and the like due to organic wastewater generated during the process. Further, since the color embodied in the metal is limited to only the surface of the metal, the use of the metal has been limited since the surface is worn out by use and the color is worn out. In addition, since the color is realized by an individual process, the color is deformed due to the respective process conditions, and thus it is difficult to produce a large amount of a certain color.

On the other hand, the Al-Si-Mg based alloy according to the embodiment of the present invention can realize the color of metal by controlling only the composition range of each Al, Si and Mg without adding a separate process, And can also provide a uniform and uniform color for a large amount of metal. In addition, the Al-Si-Mg based alloy according to an embodiment of the present invention can continuously maintain the color even if it is worn by use because the inside of the Al-Si- .

Therefore, since the Al-Si-Mg alloy according to the embodiment of the present invention is a lightweight alloy, it can be applied to various fields requiring lightweight materials such as aircraft, electronic parts, mobile devices, automobiles, and building materials. For example, the Al-Si-Mg-based alloy can be applied to a frame for holding an outer surface of a display and an interior decoration of a car interior, and can be used as a high-strength lightweight material by having blue unique to metals. When the Al-Si-Mg-based alloy is applied to a frame provided to surround the outside of the display, the Al-Si-Mg-based alloy is manufactured into a plate having a uniform thickness and then subjected to a simple process Can be easily used.

FIG. 1 is a view illustrating a clad structure of an Al-Si-Mg based alloy according to an embodiment of the present invention. FIG. 2 is a cross- Fig.

Referring to FIG. 1, the Al-Si-Mg alloy may be clad with another metal (for example, the metal may include pure metals and alloys) in the embodiment of the present invention. Mechanical strength, processability and the like can be controlled according to the thickness of the metal clad to the Al-Si-Mg alloy and the physical properties of the metal to be clad. For example, an Al-Si-Mg-based alloy may be clad on one side of the outer surface of the metal 20 as shown in Fig. 1 (a) -Mg-based alloy can be clad.

As shown in FIG. 2, the Al-Si-Mg-based alloy according to an embodiment of the present invention may be used alone or as shown in FIG. 1 so that the Al-Si-Mg-based alloy may be clad on the outer surface of another metal or the like And can be used in a form provided. The Al-Si-Mg alloy 10 may be applied as a frame to surround the outside (e.g., the edge) of the display 30. Since the Al-Si-Mg alloy 10 itself has a metallic blue color, the aesthetic feeling is improved and even when a part of the outer surface is worn, Lt; / RTI &gt;

In addition, the Al-Si-Mg based alloy according to an embodiment of the present invention has a mechanical property of a metal and has a uniform blue color, so that the polymer resin is usually used as a substitute for a part using a polymer resin or the like .

The Al-Si-Mg-based alloy according to the embodiment of the present invention is a Al-Si-Mg-based alloy containing Al and unavoidable impurities and containing Si in an amount of 2 wt% or more and 22 wt% or less, Mg in an amount of 4 wt% Mg based alloy. When the content of Si in the Al-Si-Mg alloy is less than 2 wt% to 22 wt% or the content of Mg is less than 4 wt% or more than 19 wt%, the Al-Si-Mg alloy does not have a blue color , Or only a part of the color other than the uniform blue color may be partially colored. The alloy may have a uniform blue color as a whole without distinguishing between the outer surface and the inner surface as long as it has a composition range of Si and Mg according to the present invention. The Al-Si-Mg-based alloy is provided so as to have a uniform blue color in the depth direction from the outside to the inside, and the composition range of Si and Mg is adjusted so that the blue- (not shown). Preferably, the Si content is 2.09 wt% or more to 21.1 wt% or less, and the Mg content is 4.49 wt% or more to 18.4 wt% or less.

The Al-Si-Mg-based alloy may have an average wavelength value of 420 nm to 460 nm. When the average wavelength value is less than 420 nm, the alloy may not have a blue color and may be provided with a silver-specific color, a silver-gray color. On the other hand, when the average wavelength value of the Al-Si-Mg alloy exceeds 460 nm, the blue color of the alloy may not be uniformly realized, and only a part of the silver color locally may have a blue color. Therefore, the average wavelength of the alloy is preferably in the range of 420 nm to 460 nm so as to have a uniform blue color not only to the outside but also to the inside connected to the outside as in the embodiment of the present invention.

The Al-Si-Mg alloy may have a Luminosity factor (L) of 60 to 90 as defined in JIS Z-8730. When the lightness factor is less than 340 or more than 420, the Al-Si-Mg alloy may not have a uniform blue color as a whole , The overall color of the pure Al steel may have a silver color or a non-uniform color having only a local blue color.

In general, a pure Al steel has silver gray color itself, and it can not be realized with the Al steel itself. Therefore, in order to express a desired color in the pure Al steel, an additional anodizing, Process, printing deposition, etc. should be used. On the other hand, since the process of processing the material is complicated, there is a limit to the implementation of the color, and since the implemented color is not permanent, an additional process is required, thereby causing a rise in the cost of the product. In addition, the color formed on the metal surface has difficulty in maintaining the color due to the loss of gloss and the color change depending on the conditions of the external environment. Especially, in the coating process, there is a problem of environmental pollution due to use of a paint containing a large amount of volatile organic compounds.

On the other hand, the Al-Si-Mg based alloy according to an embodiment of the present invention has properties such as the mechanical strength of Al steel, and does not use the process for realizing the above-described color, You can have a unique color of the series. In addition, the Al-Si-Mg based alloy according to the present embodiment has a blue color and at the same time has excellent ductility, so that it has excellent processability and moldability and can be applied to mass production and various applications.

The Al-Si-Mg-based alloy according to an embodiment of the present invention may contain Si in an amount of 2 wt% or more and 7 wt% or less and Mg in an amount of 5 wt% or more and 9 wt% And the remainder Al and inevitable impurities. It is preferable that the Al-Si-Mg-based alloy has high workability and moldability in order to diversify the use of the Al-Si-Mg-based alloy. In the case where the Al-Si-Mg-based alloy according to the embodiment of the present invention has a thickness of 25 탆 or less, Or more and 7 wt% or less of Si, and 5 wt% or more and 9 wt% or less of Mg, it has a problem of strong brittleness and high strength, but inferior ductility. As the thickness of the Al-Si-Mg-based alloy increases, it has more improved ductility characteristics against the external pressure. In one embodiment of the present invention, an Al-Si-Mg-based alloy having a thickness of 25 탆 or less is used for the ductility.

For example, when the Si content is less than 2 wt% and the Mg content is less than 5 wt%, the Al-Si-Mg based alloy is converted into a solid state directly from the molten state in the eutectic reaction, It becomes brittle. In addition, when Si is more than 7 wt% and Mg is more than 9 wt%, the strength is improved due to the formation of an intermetallic compound phase and a very fine lamellar structure. Preferably, the Si content is 2.09 wt% or more to 21.1 wt% or less, and the Mg content is 4.49 wt% or more to 18.4 wt% or less.

The Al-Si-Mg-based alloy may have a compressive strength of 120 MPa to 280 MPa and an elongation of 3% to 60%. When the compressive strength is less than 120 MPa or the elongation is less than 3%, it is difficult to variously control the shape of the Al-Si-Mg alloy because the Al-Si-Mg alloy has roughness and brittle and low workability there is a problem. Further, when the compressive strength of the Al-Si-Mg-based alloy exceeds 280 MPa or the elongation exceeds 60%, the mechanical strength of the Al-Si-Mg-based alloy may be lowered.

In addition, the present invention can be an alloy containing a composition represented by the following formula (1), and the inside and the outside connected to each other continuously have a blue color.

[Chemical Formula 1]

Al _(100-xy) Si _x Mg _y

In Formula 1, 2? X? 20 and 5 < y? 20.

Preferably, in the case where the thickness of the alloy is 25 占 퐉 or less, 2? X? 6 and 6?

The Al, Si and Mg may be represented _by Al _(100-xy) Si _x Mg _y as shown in Formula 1, with almost no impurities. At this time, Al, Si and Mg may be represented by atomic%, and in the formula 1, 2? X? 20 and 5? Y? 20. When x and y are out of the above ranges, the alloy can not have a uniform blue color from the outside to the inside and only a part of the alloy has a local blue color, Lt; / RTI &gt;

As the thickness of the alloy increases, the effect of ductility on the external pressure may be increased when evaluating the bending properties. For example, when the thickness of the alloy is 25 占 퐉 or less, it may be 2? X? 6 and 6? When the thickness of the alloy is 25 占 퐉 or less, when the alloy has a very thin thickness, 2? X? 6 and 6? Y? 9 in the chemical formula 1, the alloy has a blue color and excellent ductility .

Hereinafter, examples and comparative examples of the present invention will be described. However, the following examples are only a preferred embodiment of the present invention, and the scope of the present invention is not limited by the following examples.

FIG. 3A is a photograph showing a side view of an Al-Si-Mg based alloy and pure Al steel according to an embodiment of the present invention. FIG. It's a picture.

3A and 3B, pure Al and Al ₆₀ Si ₂₀ Mg ₂₀ (Al: 60.71 wt%, Si: 21.06 wt%, Mg: 18.23 wt%) alloy having a diameter of 5 mm are used Each external and internal color was identified. The Al steel is entirely silver in color, while the Al ₆₀ Si ₂₀ Mg ₂₀ alloy according to an embodiment of the present invention may be provided to have a uniform blue color in the depth direction from the outside to the inside.

Production of steel types according to Examples and Comparative Examples

As shown in Table 1, steel sheets A to V were prepared by varying the contents of Al, Si and Mg using Al (purity 99.999%), Si (purity 99.9999%) and Mg . Al was first introduced into a graphite crucible in an argon atmosphere and the temperature was raised to 600 ° C. to dissolve Al. Mg was then added to the graphite crucible in which Al was dissolved. The temperature was raised to 650 ° C. to dissolve Mg , Si was added and the temperature was raised to 1410 ° C to dissolve Al. The thus prepared Al-Si-Mg melt was placed in a Cu corn mold to produce an Al-Si-Mg alloy according to the steel types A to V. [ The Al-Si-Mg alloy according to the steel type A to the steel type V can be maintained at a high temperature by winding an induction coil so that the inside can be maintained at a high temperature. The alloy is provided in an injector provided with an outlet, A melt of the Al-Si-Mg alloy according to the steel type A to the steel type V was discharged onto a rotating copper wheel to be formed into a ribbon shape through melt spinning.

Exterior colors, bending characteristics and wavelength values were confirmed using the steel types A to V, which are Al-Si-Mg based alloys having component contents (wt%) as shown in Table 1 below, Respectively. In Table 1, Al, Si and Mg are expressed in terms of atomic weight using the formula 1 for each steel species.

Steel grade Formula 1 Al (wt%) Si (wt%) Mg (wt%) A Al ₆₀ Si ₂₀ Mg ₂₀ 60.71 21.06 18.23 B Al ₇₀ Si ₁₅ Mg ₁₅ 70.52 15.75 13.63 C Al ₇₅ Si ₂₀ Mg ₅ 74.76 20.75 4.49 D Al ₇₀ Si ₂₀ Mg ₁₀ 70.12 20.85 9.02 E Al ₆₅ Si ₂₀ Mg ₁₅ 65.44 20.96 13.6 F Al ₆₀ Si ₂₀ Mg ₂₀ 60.71 21.06 18.23 G Al ₇₅ Si ₅ Mg ₂₀ 76.36 5.30 18.34 H Al ₇₀ Si ₁₀ Mg ₂₀ 71.12 10.58 18.3 I Al ₆₅ Si ₁₅ Mg ₂₀ 65.9 15.83 18.27 J Al ₆₀ Si ₂₀ Mg ₂₀ 60.71 21.06 18.23 K Al ₇₆ Si ₁₉ Mg ₅ 75.79 19.72 4.49 L Al ₇₂ Si ₁₈ Mg ₁₀ 72.18 18.78 9.03 M Al ₆₈ Si ₁₇ Mg ₁₅ 68.54 17.84 13.62 N Al ₆₄ Si ₁₆ Mg ₂₀ 64.86 16.88 18.26 O Al ₇₆ Si ₅ Mg ₁₉ 77.3 5.29 17.41 P Al ₇₂ Si ₁₀ Mg ₁₈ 73 10.55 16.44 Q Al ₆₈ Si ₁₅ Mg ₁₇ 68.74 15.78 15.48 R Al ₆₄ Si ₂₀ Mg ₁₆ 64.5 20.98 14.52 S Al ₉₂ Si ₂ Mg ₆ 92.47 2.09 5.43 T Al ₈₇ Si ₄ Mg ₉ 87.64 4.19 8.17 U Al ₈₇ Si ₆ Mg ₇ 87.39 6.27 6.33 V Al ₈₀ Si ₁₀ Mg ₁₀ 80.42 10.55 9.03

How to check the physical properties of steel

1. Appearance color and wavelength value, brightness index L confirmation

Each steel type was made up of a plurality of specimens for each color, and their colors were confirmed. Only the steel color having a uniform blue color is displayed in blue, and when only a part has a blue color and a part includes silver color, it is displayed as nonuniformity. In addition, depending on the lightness of the blue color among the hues of the above-mentioned steel types, the light blue color was classified into green color, the middle blue color was classified into deep blue color, and the deep blue color was classified into dark blue color.

The wavelength was measured by the apparatus shown in FIG. 4, and the result as shown in FIG. 5 was confirmed and expressed as a numerical value. The spectrum was prepared using a halogen lamp as a light source using an optic fiber, and the reference was adjusted using a white reference sample in a dark room condition. Then, a wavelength value according to a color change of the sample CIE L * a * b values were measured. Samples used here were all of the same size and same conditions (measured after attaching a 10 cm length ribbon to a slide glass).

The lightness index L was measured by a device (QEPRO for CM, 200 to 925 nm with Operating software) in accordance with Hunter's color difference equation (see JIS Z8730), and all the samples were measured under the same conditions in the dark room. In order to secure the scan, the average scan was performed 100 times. The total time taken to total each data was 10 min. The color of the alloy measured along with the wavelength value was evaluated by the value of the lightness index L and the chromaticity indexes a and b according to Hunter's color difference equation (see JIS Z8730).

2. Confirm bending characteristics

FIG. 6 is a photograph showing a method of confirming the bending characteristic, and FIG. 7 is a photograph showing a result of the bending characteristic shown in Table 2. FIG. Referring to FIG. 6, bending characteristics were tested by fabricating samples (thickness 20 to 25 mu m, length 5 cm) for each steel type. Both ends of the sample were fixed with tweezers, and both ends of the sample were bent based on the center of the sample to confirm their characteristics. At this time, the same force was applied to both end portions. In order to eliminate the deviation of the experiment, a total of 5 samples were tested for each steel type.

3. Confirm compression characteristics

The samples were produced by induction heating the carbon crucible using an induction coil in an argon atmosphere to produce a rod of 3 mm in diameter. The compression characteristics of the steel were confirmed using a universal test machine at a ratio of 2: 1 of the rod diameter. To confirm the compression characteristics of each steel type, compression specimens were produced with a gauge diameter of 3 mm and a length of 6 mm, and compression tests were performed using a universal test machine (UTM). The specimens were subjected to an extensometer at room temperature under a strain of 5 × 10 ^-3 s -1. For the accuracy of the experiment, the specimens were subjected to a minimum of three times under the same conditions, Yield strength).

Result of confirmation of physical properties of steel

Referring to FIG. 7, complete brittleness refers to a case where a bending characteristic is a brittle fracture of a sample in the experiment as described above, and brittleness refers to a case where a sample is broken into pieces, though not to a degree of complete brittleness. Weak brittleness is when the sample is neatly divided into two pieces, and ductility is when the sample is completely folded and not broken. Based on the results shown in FIG. 7, the bending properties for the steel types A to V are shown in Table 2. In the case of complete brittleness, brittleness and weak brittleness in the bending properties, it means that the workability is relatively decreased in the processing of the alloy, and ductility means that the workability of the alloy is excellent. On the other hand, the bending characteristic in the present embodiment is obtained by using a sample having a thickness of 20 to 25 占 퐉, and when the thickness of the sample is increased, the bending characteristic is advantageous for ductility. Therefore, , It is possible to have ductility even in the composition range of the result of weak brittleness in the sample. That is, the workability in the bending characteristic means the workability relative to the thickness.

Steel grade Al-Si-Mg alloy Exterior color Average wavelength value (nm) Wavelength value range
(nm) Bending properties A Al ₆₀ Si ₂₀ Mg ₂₀ Jincheon 424.79 410 ~ 430 Complete brittleness B Al ₇₀ Si ₁₅ Mg ₁₅ Jincheon 425.11 410 ~ 430 Brittle C Al ₇₅ Si ₂₀ Mg ₅ Unevenness
(Some blue) 550 500 to 600
A wide range of wavelength values Brittle D Al ₇₀ Si ₂₀ Mg ₁₀ Rich 429.22 420 to 440 Brittle E Al ₆₅ Si ₂₀ Mg ₁₅ Jincheon 426.37 420 to 440 Brittle F Al ₆₀ Si ₂₀ Mg ₂₀ Jincheon 424.79 420 to 440 Complete brittleness G Al ₇₅ Si ₅ Mg ₂₀ Jincheon 433.15 420 to 450 Weak brittleness H Al ₇₀ Si ₁₀ Mg ₂₀ Jincheon 437.51 420 to 450 Brittle I Al ₆₅ Si ₁₅ Mg ₂₀ Jincheon 442.94 420 to 450 Brittle J Al ₆₀ Si ₂₀ Mg ₂₀ Jincheon 424.79 420 to 450 Complete brittleness K Al ₇₆ Si ₁₉ Mg ₅ Unevenness
(Some blue) 450.77 500 to 600
A wide range of wavelength values Complete brittleness L Al ₇₂ Si ₁₈ Mg ₁₀ Rich 452.33 430 to 460 Brittle M Al ₆₈ Si ₁₇ Mg ₁₅ Rich 449.79 430 to 460 Brittle N Al ₆₄ Si ₁₆ Mg ₂₀ Rich 435.2 430 to 460 Brittle O Al ₇₆ Si ₅ Mg ₁₉ Yeoncheong 428.87 420 to 440 Weak brittleness P Al ₇₂ Si ₁₀ Mg ₁₈ Rich 431.22 420 to 440 Brittle Q Al ₆₈ Si ₁₅ Mg ₁₇ Jincheon 427.61 420 to 440 Brittle R Al ₆₄ Si ₂₀ Mg ₁₆ Jincheon 425.1 420 to 440 Brittle S Al ₉₂ Si ₂ Mg ₆ Sky blue 450.12 410 to 460 ductility T Al ₈₇ Si ₄ Mg ₉ blue 456.65 450 to 460 ductility U Al ₈₇ Si ₆ Mg ₇ blue 426.31 420 to 440 ductility V Al ₈₀ Si ₁₀ Mg ₁₀ Rich 430.98 420-450 Weak brittleness

Figs. 8 and 9 are photographs showing the bending characteristics for the steel types shown in Table 2. Fig.

Referring to Table 2 and FIG. 8, it can be seen that the steel types E, F, and G exhibit brittle brittleness in the bending properties test. It was confirmed that the samples of both types of steel were broken into pieces, and that of steel grade G was cut into two pieces neatly without any sample debris.

Also, referring to FIG. 9, it can be seen that the steel types S, T, and U are kept in a folded state without bending during the bending characteristics test. In addition, the steel types S, T, and U could be re-folded again and restored to a state similar to that before folding.

10 to 12 are photographs comparing colors of an Al-Si-Mg based alloy and an Al steel according to an embodiment of the present invention.

Referring to Table 2, in the case of an Al-Si-Mg alloy composed of Si 2 wt% to 22 wt%, Mg 4 wt% to 19 wt%, and the remainder Al and unavoidable impurities according to an embodiment of the present invention, . The blue color shown in Table 2 means that each of the steel species has a uniform blue color from the outside to the inside, and the non-uniformity means that a part of the steel has a blue color but the blue color does not appear uniformly as a whole. In the case of an alloy represented by Al _(100-xy) Si _x Mg _y of the general formula (1 ₎ , it was confirmed that 2? X? 20 and 5 < y?
As shown in Table 1 and Table 2, as a remedy, it is preferable to contain not less than 2.09 wt% to not more than 21.1 wt% of Si and not less than 4.49 wt% to not more than 18.4 wt% of Mg, The Al-Si-Mg alloy composed of an impurity has a blue color continuously connecting the outside and the outside, an average wavelength value of 420 nm to 460 nm, and a luminosity factor defined in accordance with JIS Z-8730 60 to 90. &lt; / RTI &gt; The Al-Si-Mg-based alloy is provided so as to have a uniform blue color in the depth direction from the outside to the inside, has a compressive strength of 120 MPa to 280 MPa, and an elongation of 3% to 60%.

10, the first row shows the Al steel and the steel types L, M, N and F, the second row shows the steel types S, D, E, I and T, In the row, H, V, G, U, and B are shown. It can be confirmed that all except for the Al steel in the first row, both the outer and inner portions are uniformly blue. In addition, the first row except for the Al steel shows a light blue (blue) that looks like sky blue, the second row shows blue (blue), and the third row shows blue (dark blue) . In addition, it was confirmed that the same row has a darker blue color from left to right. Referring to FIG. 11, Al and P, O, and M are shown. Along with FIG. 10, it can be seen that the rest of the steel except for the Al steel shows uniformly blue color both outside and inside. Table 3 shows hunter and CIE L * a * b * color difference equations for the steel types A, S, T, and U shown in Table 2.

Steel grade Formula 1 Hunter L Hunter a Hunter b CIE L CIE a CIE b A Al ₆₀ Si ₂₀ Mg ₂₀ 65.2167
-4.7161
-6.6042
71.2351
-1.4006
-11.2333
S Al ₉₂ Si ₂ Mg ₆ 79.7572
4.6564
-10.5796
75
0.3511
-5.8361
T Al ₈₇ Si ₄ Mg ₉ 81.2984
6.2367
-13.0860
76.818
1.7999
-8.3543
U Al ₈₇ Si ₆ Mg ₇ 86.57
5.7013
-8.7631
83.1451
1.0989
-3.857
Comparative Example Al6061 83.5437 -4.5795 6.4843 86.895 -0.1205 2.1483

Referring to Table 2 and Table 3, it was confirmed that the blue-colored Al-Si-Mg based alloy according to an embodiment of the present invention has an average wavelength value of 420 nm to 460 nm, preferably 424 nm to 456 nm. In addition, it was confirmed that the lightness index L (Hunter L) was in the range of 60 to 90, and preferably in the range of 65 to 87 in the color difference equation of Hunter (see JIS Z8730). Further, it was confirmed that it was within the range of 70 to 85, preferably 71 to 83 on the basis of CIE L * a * b *. The measurement environment of all the samples was performed using a D65 light source, and the observer angle at that time was 10 degrees. If the light source and observer angle are different, the alloy may exhibit another L * a * b * color. On the other hand, it was confirmed that Al6061 (Al-1.0Mg-0.6Si-0.25Cu-0.25Cr alloy), which is an Al6000-based alloy having a general metal color, has no blue color even though it contains Al, Si and Mg .

That is, it can be confirmed that the Al-Si-Mg alloy having a range of Al, Si and Mg as in the embodiment of the present invention has a blue color only. Referring to Figure 10, the 20㎛ 25㎛ to the sample Al ₉₂ Si ₄ Mg ₄ thickness without having the bending properties during the experiment, but confirmed that having a flexible, the sample Al ₉₂ Si ₄ Mg ₄ Al, the blue steel ( pure Al). The sample Al ₇₅ Si ₂₀ Mg ₅ was ductile and had a blue color, but it could be confirmed that the sample did not have a uniform blue color as a whole and partially had a blue color.

The sample Al ₉₂ Si ₆ Mg ₂ was found to have an index silver gray color in a general Al steel which is ductile but not blue. Comparing this sample with the steel grade S (Al ₉₂ Si ₂ Mg ₆ ) in Table 2, the Al content of both samples is equal to 92.47 wt%, and the contents of Si and Mg are different. The bending characteristics (ductility) of the metal can be influenced by Si _x Mg _y when the thickness of the metal is the same. The sample Al ₉₂ Si ₆ Mg ₂ and the steel grade S (Al ₉₂ Si ₂ Mg ₆ ) And the content of Mg is higher than that of sample Al ₉₂ Si ₆ Mg ₂ , and it can be confirmed that the content of Mg is blue. In comparison with this sample and the steel grade U (Al ₈₇ Si ₆ Mg ₇ ) in Table 2, the sample is a steel type containing Si in both sides, and this sample does not have a blue color. On the other hand, a steel grade U containing 6.33 wt% of Mg Was found to have a blue color.

In the present invention, the bending characteristics and the blue appearance characteristics of the Al-Si-Mg based alloy are obtained when the respective component ranges are influenced by each other, and Si and Mg are in the range of 2 wt% or more to 22 wt % Si, and more than 4 wt% and not more than 19 wt% Mg, the brightness of the blue color can be controlled by having a uniform blue color as a whole and controlling the composition range of Si and Mg.

Sample Al ₇₆ Si ₁₉ Mg ₅ (75.79 wt%, 19.72 wt%, and 4.49 wt%, respectively) of Al-Si-Mg had no blue color and had a general metal silver gray color as shown in the figure. The sample Al ₉₂ Si ₄ Mg ₄ and the sample Al ₇₆ Si ₁₉ Mg ₅ both contained Si in the range of the present invention, but it was confirmed that the content of Mg was not blue when the content of Mg was outside the range of the present invention. S (Al ₉₂ Si ₂ Mg ₆ ), it is confirmed that the color of the Al-Si-Mg based alloy is blue only when the content of Si is within the range of the present invention and the content of Mg is also within the range of the present invention I could.

13 Formula 1 Exterior color Bending properties 1 (circle ○)

Al ₉₂ Si ₂ Mg ₆ blue ductility Al ₉₂ Si ₄ Mg ₄ Silver gray ductility Al ₉₂ Si ₆ Mg ₂ Silver gray ductility 2 (triangle ▲)

Al ₈₇ Si ₄ Mg ₉ blue ductility Al ₈₇ Si ₆ Mg ₇ blue ductility Al ₈₇ Si ₉ Mg ₄ Silver gray ductility

Table 5 shows the compression characteristics of the Al-Si-Mg based alloy according to an embodiment of the present invention. The Al-Si-Mg-based alloy may have a compressive strength of 120 MPa or more and 280 MPa or less, and an elongation percentage of 3% or more. Preferably, the Al-Si-Mg-based alloy may have a compressive strength of not less than 123 MPa and not more than 258 MPa, and an elongation percentage of 3 to 60%.

alloy Compressive strength (MPa) Elongation (%) Al ₆₀ Si ₂₀ Mg ₂₀ 258.17 3 Al ₇₅ Si ₅ Mg ₂₀ 272.58 11% Al ₈₇ Si ₄ Mg ₉ 122.59 Destruction x

Fig. 11 is a state diagram of the composition range of the Al-Si-Mg-based alloy of the present invention.

Referring to FIG. 11 and Table 4 above, it can be seen that the content of Mg affects the appearance of blue in the case of the same Al content. Also, when the contents of Al and Si were the same, the bending characteristics were almost similar when the total contents of Si and Mg were the same. As described above, the bending property is the workability, that is, the physical properties representing the ductility of the alloy. If the alloy is through the process reaction immediately goes to a solid state in a molten state, the alloy there are flexible it can be lowered, in the case where the Si _x Mg _y adding alloy by the Si _x Mg _y in may be employed therefore excellent It can be confirmed that it has ductility.

The Al-Si-Mg-based alloy according to one embodiment of the present invention is an alloy made of an Al-Mg-Si ternary alloy by adding Si or Mg to the Al-Mg or Al- . In addition, the Al-Si-Mg alloy can be realized as an alloy having a blue color based on an alloy design, for example, an alloy having a blue color. Further, the composition can be further controlled to improve ductility and simultaneously realize color and mechanical properties It is possible to provide a colored metal.

14A is a diagram showing a method of calculating the L * a * b * colorimetric system, and FIG. 14B is a graph showing a CIE L * a * b * coordinate system for Table 3 using FIG. 14A. FIG. 15 is a graph showing reflectivity and wavelength for Table 3, and FIG. 16 is a graph showing alloy color for Table 3. FIG. 17 is a graph showing the metal color of the Al-Si-Mg-based alloy according to the present invention.

14A, the CIE L * a * b * colorimeter is a value used by JIS (JIS Z 8729). In the L * a * b * colorimetric system, the lightness is L *, the chroma representing hue and saturation is a * b *. Specifically, CIE L * a * b * can be obtained by the following method using a tristimulus value.

The reflectance of the material is measured in the visible ray area using a colorimeter, and the wavelength of the light source is obtained on the basis of the measured reflectance D65 (sunlight at noon, color temperature 6500K). Then, by multiplying the reflectance value of the material by the observer angle, the tristimulus value of the material can be obtained. The tristimulus value of the material can be obtained by substituting the CIE L * a * b * value based on the thus determined tristimulus value.

First, a value corresponding to each wavelength of the used light source is obtained, which can be obtained by an example as shown in the table shown in FIG. 14A. Next, the reflectivity corresponding to each wavelength is obtained, and the corresponding observer function value is obtained. Then, the above values are added to the value of the visible light area, the value corresponding to each wavelength of the used light source, the reflectivity, and the observer function value.

It is transformed into a CIE Xyz function value through variable substitution using the following equation.

x = X / (X + Y + Z)

y = Y / (X + Y + Z)

z = Z / (X + Y + Z) = 1 - x - y

Then, it is converted into a CIE L * a * b * function value through variable substitution using the following equation.

L * = 116f (Y / Y?) - 16

a * = 500 [f (X / X?) - f (Y / Y?)]

b * = 200 [f (Y / Y?) - f (Z / Z?)]

if, t (6/29) ³ , f (t) = t ^1/3

if, If t≤ (6/29) ³ a, f (t) = (1/3 ) * (29/6) 2 t + (4/29)

14B, when an Al-Si-Mg based alloy according to an embodiment of the present invention is expressed by CIE L * a * b * chromaticity, L is 70 to 85, a * is -1 to 3, b * may be from -12 to -1. Alternatively, when expressed in a CIE Yxy coordinate system, Y has a value of 42 to 62, x has a value of 2.7 to 3.1, and y has a value of 2.8 to 3.1.

For example, in FIG. 14B, the color difference between Al 6061 of the comparative example and the Al-Si-Mg alloy of this embodiment is shown by using CIE L * a * b *. The b * value of Al 6061 is positive, whereas the b * value of Al-Si-Mg alloy according to the embodiment of the present invention is b * value when b * is negative and smaller, It can be confirmed that all values are negative.

FIG. 15 is a graph showing the optical characteristics of a metal. In the case of a metal, it has a color due to absorption and reflection of light. In the case of absorption at a specific wavelength and reflection at a specific wavelength, . On the contrary, when the reflectance is similar over the entire wavelength range, it is seen as a general metal color.

Specifically, the optical characterization mechanism of the metal can be seen in the color of the visible portion, and in the portion of high reflectivity. For example, in the case of Al-6061, the reflectivity at 400 nm to 500 nm is lower than that at 500 nm or later. In addition, it can be seen that similar reflectivity is exhibited across all wavelength ranges with a difference in reflectivity of less than 5% across the entire wavelength range. Therefore, it can be confirmed that the apparent color of Al-6061 is made of only a general metal color and is not blue. On the other hand, in the case of the Al-Si-Mg based alloy according to the embodiment of the present invention, it was confirmed that the reflectivity at a blue wavelength of 400 nm to 500 nm is higher than other wavelength ranges, It was confirmed that the color of the Al-Si-Mg based alloy becomes blue. Especially, in the case of Al ₆₀ Si ₂₀ Mg ₂₀ showing the most blue color, the reflectance of the wavelength range from 400 nm to 500 nm is remarkably higher than that of the other portions.

As described above, when the spectrum of the Al-Si-Mg based alloy according to the embodiment of the present invention is compared with the spectrum of Al6061, which is an Al6000 based alloy which is a comparative example containing conventional Si-Mg, the reflectance of the blue series in the range of 380 nm to 490 nm And there is a large difference in the spectrum after 490 nm. This is because Al6061, which is a comparative example containing Si-Mg, shows a constant reflectance with respect to wavelength, while the steel according to an embodiment of the present invention shows a great change in reflectivity at a specific wavelength. It can be confirmed that it has a distinctive appearance color of the embodiment of the present invention due to the difference in reflectivity.

That is, in the conventional Al6061 containing Si-Mg, the rate of change of reflectivity is within 10% within a wavelength range of 400 nm to 500 nm which is a blue wavelength range, while the Al-Si-Mg based alloy according to the embodiment of the present invention The rate of change of reflectance may be more than 10% in the wavelength range of 400 nm to 500 nm, and the rate of change of reflectance is preferably 10% to 30%.

Referring to FIG. 16, the representative color when the actual L * a * b * color coordinate system is replaced is shown. It was confirmed that the Al-Si-Mg based alloy according to the embodiment of the present invention has blue color differently from Al6061, which is a comparative example containing Si-Mg. The color difference according to the embodiment of the present invention with respect to Al 6061, which is a comparative example containing Si-Mg in the prior art, is an index indicating how much color differs in color, Lt; RTI ID = 0.0 &gt; Al6061). &Lt; / RTI &gt; The index is mainly used in the field of paper or paint, and the color difference is determined by the following formula, and the color difference index by the index can be divided as follows.

Color difference = (L ² + a ² + b ² ) ^½

0 <color difference <1.5: difficult level to identify with the naked eye

1.5 ≤ color difference <2.3: Unclear level of visual identification

2.3 ≤ color difference: the level of identification with the naked eye

In relation to this color difference, it can be visually identified (ΔEab *) when the color difference (ΔEab *) is approximately 2.3 in the document (Sharma, Gaurav, Digital Color Imaging Handbook, CRC Press, 2003, ISBN 0-8493-0900- ≒ 2.3 Equivalent to a JND (just noticeable difference) is described.

Referring to FIG. 16, the Al-Si-Mg based alloy according to an embodiment of the present invention has a color difference of 7 or more and has originality as compared with Al6061, which is a comparative example in which Si-Mg is conventionally contained.

17 is a graph showing the metal color of the Al-Si-Mg-based alloy according to the present invention.

17, the Al-Si-Mg alloy according to the embodiment of the present invention contains Si in an amount of 2 wt% or more and 22 wt% or less, Mg in an amount of 4 wt% or more and 19 wt% or less, And an inevitable impurity, and the inside and the outside connected to each other are continuously blue.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalents thereof are included in the scope of the present invention Should be interpreted.

10: Al-Si-Mg alloy
20: Metal
30: Display

Claims (14)

And a composition represented by at least one of Al ₉₂ Si ₂ Mg ₆ , Al ₈₇ Si ₄ Mg ₉ and Al ₈₇ Si ₆ Mg ₇ of the following formula and inevitable impurities, ,
An average wavelength value of 426.31 nm to 456.65 nm,
A luminosity factor defined according to JIS Z-8730 is 79.7572 to 86.57,
When expressed in CIE L * a * b * chromaticity, L is 75 to 83.1451, a * is 0.3511 to 1.7999, b * is -8.3543 to -3.857,
The color difference calculated by the following formula is 7.184171 to 14.68123,
The rate of change of reflectance in the wavelength range of 400 nm to 500 nm is 10% to 30%
Wherein the light guide plate is provided so as to have a uniform blue color in the depth direction from the outside to the inside,
A compressive strength of not less than 120 MPa and not more than 280 MPa,
An Al-Si-Mg-based alloy having an elongation of 3% or more and 60% or less.
Color difference = (L ² + a ² + b ² ) ^½ delete delete delete delete delete delete The method according to claim 1,
The Al-Si-Mg-based alloy is applied as a frame to surround the outside of the display. The method according to claim 1,
Wherein the Al-Si-Mg-based alloy is clad with another metal. delete delete delete delete delete

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