KR20160138829A - Magnesium alloy material and manufacturing method thereof - Google Patents

Magnesium alloy material and manufacturing method thereof Download PDF

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Publication number
KR20160138829A
KR20160138829A KR1020150073208A KR20150073208A KR20160138829A KR 20160138829 A KR20160138829 A KR 20160138829A KR 1020150073208 A KR1020150073208 A KR 1020150073208A KR 20150073208 A KR20150073208 A KR 20150073208A KR 20160138829 A KR20160138829 A KR 20160138829A
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South Korea
Prior art keywords
magnesium alloy
alloy material
heat treatment
present
magnesium
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KR1020150073208A
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Korean (ko)
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KR101685818B1 (en
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이종윤
진주영
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현대제철 주식회사
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2202/00—Physical properties

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)

Abstract

A magnesium alloy material and a method of manufacturing the same are disclosed. The magnesium alloy material of the present invention is characterized by containing 0.01 to 5% by weight of thallium (Tl), magnesium (Mg) of the remaining amount, and unavoidable impurities.

Description

TECHNICAL FIELD [0001] The present invention relates to a magnesium alloy material and a method of manufacturing the same. BACKGROUND ART < RTI ID = 0.0 >

The present invention relates to a magnesium alloy material and a method of manufacturing the same. More particularly, the present invention relates to a magnesium alloy material excellent in room temperature moldability and a method for producing the same.

Magnesium alloys are the lightest alloys currently commercialized and are used in automotive parts to maximize lighter weight. In recent years, there has been a rapid increase in the demand for automobile parts employing magnesium alloys due to the enlargement through integration of parts, the application of automobile engine parts due to the development of heat-resistant alloys, and the application of automobile parts using processing materials. At this time, the heat resistant magnesium alloy for application to high temperature automobile parts is required to have mechanical characteristics, casting and corrosion resistance at normal temperature and high temperature.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 2003-0048412 (published on Jun. 19, 2003, entitled "High Strength Magnesium Alloy and Manufacturing Method Thereof").

According to one embodiment of the present invention, there is provided a magnesium alloy material excellent in room temperature moldability and castability.

According to one embodiment of the present invention, there is provided a magnesium alloy material excellent in heat resistance and economical efficiency.

According to an embodiment of the present invention, there is provided a method of manufacturing the magnesium alloy material.

One aspect of the present invention relates to a magnesium alloy material. In one embodiment, the magnesium alloy material is characterized by containing 0.01 to 5% by weight of thallium (Tl), magnesium (Mg) in the balance portion, and unavoidable impurities.

In one embodiment, the content of thallium may be 0.05-0.5 wt%.

In one embodiment, the texture intensity of the (0001) plane of the magnesium alloy material may be 3.5 or less.

Another aspect of the present invention relates to a method of manufacturing the magnesium alloy material. In one embodiment, the method of manufacturing the magnesium alloy material comprises the steps of: injecting thallium (Tl) into a molten magnesium containing magnesium; Casting the molten metal to produce an intermediate material; Subjecting the intermediate member to a first heat treatment; Rolling the primary heat treated intermediate material; And subjecting the rolled intermediate material to a secondary heat treatment, wherein the magnesium alloy material comprises 0.01 to 5% by weight of thallium (Tl), magnesium (Mg) in the balance portion, and unavoidable impurities.

In one embodiment, the primary heat treatment may be heating the intermediate material at 300 ° C to 400 ° C for 20 seconds to 50 minutes.

In one embodiment, the rolling may be rolling the primary heat treated intermediate material at a reduction rate of 5-15% per pass.

In one embodiment, the secondary heat treatment may be to heat the rolled intermediate material at 250 ° C to 400 ° C for 10 seconds to 30 minutes.

The magnesium alloy material according to the present invention has excellent moldability at room temperature and excellent heat resistance, castability and economical efficiency.

1 shows a method of manufacturing a magnesium alloy material according to one embodiment of the present invention.
Fig. 2 (a) shows the surface of the magnesium alloy material before the secondary heat treatment according to the comparative example of the present invention, Fig. 2 (b) shows the surface after the secondary heat treatment of the magnesium alloy material, Shows the orientation of the magnesium alloy before the secondary heat treatment, and Fig. 2 (d) shows the orientation of the magnesium alloy after the secondary heat treatment.
Fig. 3 (a) shows the surface of the magnesium alloy material according to the present invention after the second heat treatment, Fig. 3 (b) shows the surface of the magnesium alloy material before the second heat treatment, Shows the orientation of the magnesium alloy material after the second heat treatment.
Fig. 4 (a) is a graph showing change in texture after the rolling and after the secondary heat treatment of the magnesium alloy material of the comparative example according to the present invention. Fig. 4 (b) And the change of texture after heat treatment was measured.
5 shows an erichsen test method of a magnesium alloy material.
6 (a) is a photograph showing the result of Ericsson test measurement relating to the room temperature molding property of the magnesium alloy material according to the comparative example of the present invention, and FIG. 6 (b) is a photograph showing the result of Ericsson test measurement of the magnesium alloy material according to the embodiment of the present invention This is the picture shown.

Hereinafter, the present invention will be described in detail. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to be exemplary, self-explanatory, allowing for equivalent explanations of the present invention.

One aspect of the present invention relates to a magnesium alloy material. The magnesium alloy material of the present invention contains 0.01 to 5% by weight of thallium (Tl), magnesium (Mg) in the remaining amount, and unavoidable impurities.

The thallium (Tl) atom used in the present invention is about 20% larger than the magnesium (Mg) atom, is excellent in solid solution strengthening effect, and is included for improving the room temperature moldability by weakening the texture. The thallium prevents the phenomenon of low room temperature formability because the (0001) plane of the magnesium alloy material changes in the stress direction (ND) due to the physical property that the magnesium alloy has an ideal axial ratio (c / a) . The thallium is contained in an amount of 0.01 to 5% by weight based on the total weight of the magnesium alloy material. When the magnesium alloy material is included in the above range, a slip occurs in the basal plane of the magnesium alloy material, and a compressive twin is formed together with a tensile twin to form a set of magnesium alloy of the present invention The structure can be weakened and the room temperature moldability can be improved.

When the content of thallium is less than 0.01% by weight based on the total weight of the magnesium alloy material, the room temperature moldability is insignificantly improved, and if it exceeds 5% by weight, the corrosion resistance is lowered and hot cracking may occur. For example, thallium may be contained in an amount of 0.05 to 0.5% by weight.

In one embodiment, the texture intensity of the (0001) plane of the magnesium alloy material may be less than 3.5. The moldability at room temperature of the magnesium alloy material can be excellent at the set strength in the above range. For example, it may be 2.0 to 3.5.

Another aspect of the present invention relates to a method of manufacturing the magnesium alloy material. 1 shows a method of manufacturing a magnesium alloy material according to one embodiment of the present invention. Referring to FIG. 1, the method for manufacturing the magnesium alloy material comprises the steps of (S101) preparing an intermediate material; (S102) a first heat treatment step; (S103) a rolling step; And (S104) a secondary heat treatment step. More specifically, (S101) a step of casting a molten metal containing 0.01 to 5% by weight of thallium (Tl), magnesium (Mg) and unavoidable impurities in the balance portion to prepare an intermediate material; (S102) a step of subjecting the intermediate member to a first heat treatment; (S103) rolling the primary heat-treated intermediate member; And (S104) subjecting the rolled intermediate material to a secondary heat treatment.

Hereinafter, the magnesium alloy material manufacturing method of the present invention will be described step by step.

( S101 ) Intermediate manufacturing stage

This step is a step of casting a molten metal containing 0.01 to 5% by weight of thallium (Tl), magnesium (Mg) and unavoidable impurities in the remaining part to prepare an intermediate material. In an embodiment, the intermediate material may be produced in the form of a billet.

( S102 ) Primary heat treatment step

The above step is a first heat treatment of the intermediate member. The primary heat treatment may be carried out for the purpose of removing the segregation of the magnesium alloy material of the present invention and homogenizing it. In one embodiment, the primary heat treatment may heat the intermediate material at 300 ° C to 400 ° C for 20 seconds to 50 minutes. The effect of homogenization of the magnesium alloy material of the present invention by removing segregation during heating under the above conditions can be excellent. For example, it can be heated at 350 ° C to 400 ° C for 30 seconds to 40 minutes.

( S103 ) Rolling step

The step is a step of rolling the primary heat-treated intermediate member. In one embodiment, the rolling can roll the primary heat treated intermediate material at a reduction rate of 5-15% per pass. It is possible to prevent the breakage of the intermediate member and the deterioration of the physical properties of the magnesium alloy material of the present invention when rolling at the above-mentioned reduction ratio.

( S104 ) Second heat treatment step

This step is a step of secondary heat treatment of the rolled intermediate material. The secondary heat treatment can be carried out for the purpose of improving workability and mechanical properties of the magnesium alloy material of the present invention by forming recrystallization, weakening the texture, and removing residual stress.

In a specific example, the rolled intermediate material may be heated at 250 ° C to 400 ° C for 10 seconds to 30 minutes. In the secondary heat treatment under the above conditions, the magnesium alloy material of the present invention can have excellent processability and mechanical properties by forming recrystallization, weakening (0001) texture and removing residual stress.

In one embodiment, rolling and secondary heat treatment of the intermediate member may be repeated a plurality of times until the desired thickness and physical properties are obtained.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to preferred embodiments of the present invention. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

Example

0.1% by weight of thallium (Tl), magnesium (Mg) of the remaining amount, and unavoidable impurities were continuously cast to prepare an intermediate material in the form of a billet. The intermediate material was subjected to a primary heat treatment at 350 DEG C for 30 minutes, and the primary heat treated intermediate material was rolled at a reduction ratio of 10% per pass. Then, the rolled intermediate material was heated at 350 DEG C for 30 seconds to be subjected to a secondary heat treatment to produce a magnesium alloy material.

Comparative Example

Magnesium alloy material was prepared in the same manner as in the above example except that thallium was not included.

2 (a) is a graph showing electron back scattered diffraction (EBSD) photographs and origin misorientation of the surface of the magnesium alloy material according to the comparative example of the present invention before the secondary heat treatment, and FIG. 2 and b) is a graph showing the photograph and the orientation of the surface of the magnesium alloy material subjected to the secondary heat treatment by EBSD analysis. Fig. 2 (c) shows the orientation of the comparative magnesium alloy before the second heat treatment, and Fig. 2 (d) shows the orientation of the magnesium alloy after the second heat treatment.

Referring to FIG. 2 (c), in the line scan, the orientation 1 of the comparative example before the second heat treatment showed a change of orientation of 0 degrees and 86 degrees. Referring to FIG. 2 (d) In the azimuth (2) of the comparative example, twinning was grown and the fraction was increased, but the azimuthal change was similar to that before the secondary heat treatment.

3 (a) is an electron backscattering diffraction (EBSD) photograph of the surface of the magnesium alloy material according to the present invention after the secondary heat treatment, and FIG. 3 (b) is a graph showing the orientation of the surface of the magnesium alloy material before the secondary heat treatment And FIG. 3 (c) shows the orientation of the magnesium alloy material after the second heat treatment.

It can be seen that one line of FIG. 3 (a) is a twin crystal having a shape similar to that of FIG. 2, and the other two twin lines have another twin having an orientation of about 56 degrees.

Referring to FIG. 3 (c), the initial recrystallization strain behavior after the secondary heat treatment in the embodiment was different from the comparative example in which thallium was not included, and it was confirmed that the twinning of the newly formed embodiment was recrystallized with various orientations .

Fig. 4 (a) is a contour line graph of changes in texture after the rolling and after the secondary heat treatment of the magnesium alloy material of the comparative example according to the present invention. Fig. 4 (b) The contour plot of the texture after the secondary heat treatment is shown in a contour graph.

Referring to FIG. 4, in the case of the magnesium alloy material of the embodiment, the change of the texture of the magnesium alloy material in the secondary heat treatment was significantly larger than that of the magnesium alloy material of the comparative example not containing thallium and the (0001) I could confirm. In other words, it was confirmed that distribution and numerical values of (0001) indicate that the planes of various orientations are perpendicular to the direction of stress (ND), which weakens the strong (0001) texture.

5 shows an erichsen test method of a magnesium alloy material. The Index of Erichsen derived from the Ericsson test is an index showing the formability in which the material is deformed without being broken. Unlike the uniaxial tensile test, it is a representative index showing moldability in a stress state of two or more axes. The higher the Ericsson value, the better the formability can be interpreted.

6 (a) is a photograph showing the result of Ericsson test measurement relating to the room temperature molding property of the magnesium alloy material according to the comparative example of the present invention, and FIG. 6 (b) is a photograph showing the result of Ericsson test measurement of the magnesium alloy material according to the embodiment of the present invention This is the picture shown. Referring to FIG. 6, the test value of the comparative magnesium alloy material is 4.3 mm, while the test value of the magnesium alloy material of the embodiment is measured to be 10.7 mm. As a result, I could.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

0.01 to 5% by weight of thallium (Tl), magnesium (Mg) in the balance portion, and unavoidable impurities.
The method according to claim 1,
Wherein the content of thallium is 0.05 to 0.5 wt%.
The method according to claim 1,
And the texture intensity of the (0001) plane of the magnesium alloy material is 3.5 or less.
Casting a molten metal containing 0.01 to 5% by weight of thallium (Tl), magnesium (Mg) and unavoidable impurities in a remaining amount to produce an intermediate material;
Subjecting the intermediate member to a first heat treatment;
Rolling the primary heat treated intermediate material; And
And subjecting the rolled intermediate material to a secondary heat treatment.
5. The method of claim 4,
Wherein the primary heat treatment is performed by heating the intermediate material at 300 ° C to 400 ° C for 20 seconds to 50 minutes.
5. The method of claim 4,
Wherein the rolling is performed by rolling the primary heat treated intermediate material at a reduction ratio of 5 to 15% per pass.
5. The method of claim 4,
Wherein the second heat treatment is performed by heating the rolled intermediate material at 250 ° C to 400 ° C for 10 seconds to 30 minutes.
KR1020150073208A 2015-05-26 2015-05-26 Magnesium alloy material and manufacturing method thereof KR101685818B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10130770A (en) * 1996-09-21 1998-05-19 Daimler Benz Ag Use of material made of magnesium
KR20030044997A (en) * 2003-05-23 2003-06-09 연우인더스트리(주) High formability the Magnesium alloy and manufacture method of the Magnesium alloy product thereof
KR20040035646A (en) * 2004-04-06 2004-04-29 김강형 Manufacturing method and high formability magnesium alloy wrought product
JP2008106337A (en) * 2006-10-27 2008-05-08 Shingijutsu Kenkyusho:Kk Rolled material of magnesium alloy, and method for producing the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10130770A (en) * 1996-09-21 1998-05-19 Daimler Benz Ag Use of material made of magnesium
KR20030044997A (en) * 2003-05-23 2003-06-09 연우인더스트리(주) High formability the Magnesium alloy and manufacture method of the Magnesium alloy product thereof
KR20040035646A (en) * 2004-04-06 2004-04-29 김강형 Manufacturing method and high formability magnesium alloy wrought product
JP2008106337A (en) * 2006-10-27 2008-05-08 Shingijutsu Kenkyusho:Kk Rolled material of magnesium alloy, and method for producing the same

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