KR20170076268A - Magnesium alloy for castin and method for manufacturing the same - Google Patents

Magnesium alloy for castin and method for manufacturing the same Download PDF

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Publication number
KR20170076268A
KR20170076268A KR1020150186318A KR20150186318A KR20170076268A KR 20170076268 A KR20170076268 A KR 20170076268A KR 1020150186318 A KR1020150186318 A KR 1020150186318A KR 20150186318 A KR20150186318 A KR 20150186318A KR 20170076268 A KR20170076268 A KR 20170076268A
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South Korea
Prior art keywords
magnesium alloy
alloy
magnesium
molten metal
mpa
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KR1020150186318A
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Korean (ko)
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KR101797131B1 (en
Inventor
박우진
엄형섭
김상진
최대환
Original Assignee
주식회사 포스코
재단법인 포항산업과학연구원
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Priority to KR1020150186318A priority Critical patent/KR101797131B1/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
    • B22D21/04—Casting aluminium or magnesium
    • 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
    • C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
    • 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

Abstract

The present invention relates to a magnesium alloy and a method of manufacturing the same.
One embodiment of the present invention relates to a magnesium alloy comprising 6.0 to 15.0 wt% of aluminum (Al), 0.3 to 3.0 wt% of zinc (Zn), 0.01 to 3.0 wt% of antimony (Sb) (Sr): 0.01 to 1.0% by weight, the balance magnesium (Mg) and other unavoidable impurities.

Description

TECHNICAL FIELD [0001] The present invention relates to a magnesium alloy for casting and a method for manufacturing the magnesium alloy. [0002] MAGNESIUM ALLOY FOR CASTIN AND METHOD FOR MANUFACTURING THE SAME [

One embodiment of the present invention relates to a magnesium alloy for casting and a method of manufacturing the magnesium alloy.

AZ-based cast magnesium alloys are widely used for automotive parts because they are lightweight and excellent in castability. However, application range is limited due to low yield strength and tensile strength.

In particular, the application of AZ-based alloys to high-speed moving parts such as automobile road wheels can further improve the performance of automobiles. However, a conventional low-pressure casting method can be used for manufacturing a road wheel of an automobile. Since the cooling speed is low when the low-pressure casting method is used, a low-strength product can be produced. Therefore, in order to apply the AZ-based alloy to the above-mentioned fields, it is necessary to improve the yield strength and the tensile strength.

A magnesium alloy for casting, and a method of manufacturing the magnesium alloy.

The magnesium alloy for casting according to one embodiment of the present invention comprises 6.0 to 15.0 wt% of aluminum (Al), 0.3 to 3.0 wt% of zinc (Zn), 0.01 to 3.0 wt% of antimony (Sb) 3.0 wt.%, Strontium (Sr): 0.01 to 1.0 wt.%, Magnesium (Mg) and other unavoidable impurities.

The average crystal grain size of the magnesium alloy may be 20 to 70 mu m.

The yield strength of the magnesium alloy may be 130 to 160 MPa.

The tensile strength of the magnesium alloy may be 225 to 260 MPa.

The elongation of the magnesium alloy may be 3.5 to 5.0%.

According to another aspect of the present invention, there is provided a method of preparing a magnesium alloy for casting, comprising: preparing a molten metal; Casting the molten metal to produce a magnesium alloy; And heat-treating the magnesium alloy, wherein the step of heat-treating the magnesium alloy comprises: solubilizing the magnesium alloy; Cooling the solution-treated alloy; And aging the cooled alloy.

The step of solubilizing the magnesium alloy may be performed at a temperature ranging from 350 to 450 DEG C for 10 to 20 hours.

Cooling the solution-treated alloy; May be water-cooled to a range of 1 to 100 DEG C / h.

Aging the cooled alloy may be performed at a temperature ranging from 150 to 250 < 0 > C for 15 to 25 hours.

Wherein the molten metal comprises 6.0 to 15.0% by weight of aluminum (Al), 0.3 to 3.0% by weight of zinc (Zn), 0.01 to 3.0% by weight of antimony (Sb) %, Strontium (Sr): 0.01 to 1.0 wt%, magnesium (Mg), and other unavoidable impurities.

The step of casting the molten metal to produce the magnesium alloy may be a low-pressure casting method, a gravity casting method, or a combination thereof.

The average crystal grain size of the magnesium alloy may be 20 to 70 mu m.

The yield strength of the magnesium alloy may be 130 to 160 MPa.

The tensile strength of the magnesium alloy may be 225 to 260 MPa.

The elongation of the magnesium alloy may be 3.5 to 5.0%.

According to an embodiment of the present invention, antimony (Sb) and strontium (Sr) are added to an AZ-based magnesium alloy, and subsequent heat treatment after casting can produce a magnesium alloy having improved yield strength and tensile strength without decreasing elongation have. Therefore, a high-strength magnesium alloy can be provided by using a low-pressure casting method or a gravity casting method.

1 shows (a) an optical tissue photograph and (b) an SEM photograph of the Example 5 produced by the low-pressure casting process.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is intended that the disclosure of the present invention be limited only by the terms of the appended claims. Like reference numerals refer to like elements throughout the specification.

Thus, in some embodiments, well-known techniques are not specifically described to avoid an undesirable interpretation of the present invention. Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Whenever a component is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements, not the exclusion of any other element, unless the context clearly dictates otherwise. Also, singular forms include plural forms unless the context clearly dictates otherwise.

The magnesium alloy, which is an embodiment of the present invention, comprises 6.0 to 15.0 wt% of aluminum (Al), 0.3 to 3.0 wt% of zinc (Zn), 0.01 to 3.0 wt% of antimony (Sb) 0.01 to 1.0% by weight of strontium (Sr), the balance magnesium (Mg) and other unavoidable impurities.

First, the reason for limiting the above components will be described.

Aluminum (Al) not only contributes to improving the fluidity of the magnesium alloy, but also enhances the strength by forming precipitates for strengthening magnesium (Mg) and Mg-Al. It may also form additional antimony (Sb) and Al-Sb precipitate phases.

Accordingly, it may be added in an amount of 6 wt% or more to form a precipitation phase with magnesium or an aluminum element as described above and to expect strength improvement and casting. However, if it is added in an amount exceeding 15% by weight, ductility may be reduced.

Adding a small amount of zinc (Zn) to the magnesium alloy can be expected to enhance the solvency. However, if the addition amount is excessively large, mechanical properties such as ductility may be reduced due to segregation.

Therefore, 0.3 wt% or more can be added in order to expect solid solution strengthening effect, but when it exceeds 3 wt%, coarse precipitation phase is formed and strength can be reduced

Antimony (Sb) can form a Mg-Sb precipitate phase with magnesium (Mg), which is a base metal. In addition, aluminum (Al) and Al-Sb precipitation phases to be added together can be formed, thereby contributing to improvement of tensile strength.

More specifically, even when a trace amount of about 0.01% by weight is added, the tensile strength can be improved. However, when it is added in an amount exceeding 3% by weight, a coarse precipitation phase is formed and the strength and ductility can be reduced.

Strontium (Sr) can form Mg-Sr precipitation phases with magnesium (Mg), which is a base metal. In addition, aluminum (Al) and Al-Sb precipitation phases to be added together can be formed, thereby contributing to improvement of tensile strength. In addition, it also contributes to an improvement in the tensile strength or an improvement in elongation due to grain refinement.

More specifically, even when a trace amount of about 0.01% by weight is added, tensile strength and elongation can be improved due to grain refinement or precipitation. However, when it is added in an amount exceeding 1% by weight, a coarse precipitation phase may be formed and the strength and ductility may be lowered.

Therefore, by utilizing the property of antimony (Mg-Sb) to form a fine dispersion phase with magnesium, the role of strontium (Al-Sr) to form a fine dispersion state of aluminum and the grain refining function of strontium (Sr) Magnesium alloy of the desired strength and ductility can be obtained.

More specifically, the average crystal grain size of the magnesium alloy satisfying the above-described components and composition ranges may be 20 to 70 탆. The yield strength of the magnesium alloy may be 130 to 160 MPa. The tensile strength of the magnesium alloy may be 225 to 260 MPa, and the elongation of the magnesium alloy may be 3.5 to 5.0%.

According to another aspect of the present invention, there is provided a method of manufacturing a magnesium alloy, comprising: preparing a molten metal; Casting the molten metal to produce a magnesium alloy; And heat treating the magnesium alloy.

More specifically, the step of heat-treating the magnesium alloy includes: a step of solubilizing the magnesium alloy; Cooling the solution-treated alloy; And aging the cooled alloy.

The step of solubilizing the magnesium alloy may be performed at a temperature ranging from 350 to 450 ° C for 10 to 20 hours.

Cooling the solution-treated alloy; May be water-cooled to a range of 1 to 100 DEG C / h.

Aging the cooled alloy may be performed at a temperature ranging from 150 to 250 < 0 > C for 15 to 25 hours.

More specifically, when the magnesium alloy produced by casting is subjected to the subsequent heat treatment in the temperature and time range, it is possible to provide a magnesium alloy having improved yield strength and tensile strength without decreasing the elongation.

Wherein the molten metal comprises 6.0 to 15.0% by weight of aluminum (Al), 0.3 to 3.0% by weight of zinc (Zn), 0.01 to 3.0% by weight of antimony (Sb) By weight, strontium (Sr): 0.01 to 1.0% by weight, magnesium (Mg), and other unavoidable impurities. At this time, the components and the composition ranges of the molten metal are the same as those of the magnesium alloy described above, and thus a detailed description thereof will be omitted.

The step of casting the molten metal to produce the magnesium alloy may include, but is not limited to, a low pressure casting method, a gravity casting method, or a combination thereof.

In addition, since the above method is a general process, a detailed description will be omitted.

The average crystal grain size of the magnesium alloy produced by the above method may be 20 to 70 탆. The yield strength of the magnesium alloy may be 130 to 160 MPa. The tensile strength of the magnesium alloy may be 225 to 260 MPa, and the elongation of the magnesium alloy may be 3.5 to 5.0%.

Example

Various magnesium tensile test specimens having the chemical compositions shown in the following Table 1 were prepared by a low-pressure casting method and then heat-treated. At this time, the heat treatment conditions were a solution treatment at 415 ° C for 12 hours, followed by water cooling at a rate of 10 ° C / h. Thereafter, the resultant was aged at 200 DEG C for 20 hours.

The tensile test specimen and the fatigue test specimen are as follows. The shape of the tensile specimen is a cylindrical type. The diameter of the gage portion, the length of the gage portion, and the total length of the specimen are 7 mm, 25 mm, and 66 mm, respectively.

division Chemical composition (% by weight) Tensile Properties Al Zn Sb Sr Mg Yield strength (MPa) Maximum Seal
Strength (MPa) Elongation
(%) Comparative Example 1 6 0.3 - - Remainder 118 206 3.2 Comparative Example 2 9 One - - Remainder 135 220 2.9 Comparative Example 3 15 3 - - Remainder 145 229 2.6 Example 1 6 0.3 0.1 0.01 Remainder 135 236 4.7 Example 2 9 0.3 0.4 0.1 Remainder 148 243 4.4 Example 3 15 0.3 3.0 1.0 Remainder 157 245 3.8 Example 4 6 One 0.1 0.01 Remainder 144 243 4.4 Example 5 9 One 0.4 0.1 Remainder 155 255 4.2 Example 6 15 One 3.0 1.0 Remainder 157 249 3.7 Example 7 6 3 0.1 0.01 Remainder 146 243 4.3 Example 8 9 3 0.4 0.1 Remainder 148 239 4.1 Example 9 15 3 3.0 1.0 Remainder 139 229 3.8

As a result, as shown in Table 1, it can be seen that the yield strength, the tensile strength and the elongation ratio of the Examples are all superior to those of the Comparative Examples.

This may be due to the effect of the precipitation phase and grain refinement and the effect of the subsequent heat treatment process after the magnesium alloy casting, by adding antimony and strontium. The above-mentioned characteristic can also be confirmed through FIG.

More specifically, FIG. 1 shows (a) optical tissue photographs and (b) SEM photographs of Example 5 produced by a low-pressure casting process.

Thus, as shown in FIG. 1, it can be seen that the crystal grains of Example 5 are 45 m. On the other hand, in the case of Comparative Examples 1 to 3 which did not contain antimony and strontium, it was confirmed that they had crystal grains of 100 to 300 mu m on average, from which it was found that the tensile strength, yield strength and elongation Able to know.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand.

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 detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be interpreted as being included in the scope of the present invention .

Claims (17)

(Al): 6.0 to 15.0 wt%, zinc (Zn): 0.3 to 3.0 wt%, antimony (Sb): 0.01 to 3.0 wt%, strontium (Sr): 0.01 to 1.0 wt% based on 100 wt% By weight, the balance magnesium (Mg) and other unavoidable impurities.
The method according to claim 1,
Wherein the magnesium alloy has an average crystal grain size of 20 to 70 占 퐉.
3. The method of claim 2,
Wherein the magnesium alloy has a yield strength of 130 to 160 MPa.
The method of claim 3,
Wherein the magnesium alloy has a tensile strength of 225 to 260 MPa.
The method according to claim 1,
Wherein the magnesium alloy has an elongation of 3.5 to 5.0%.
Preparing a molten metal;
Casting the molten metal to produce a magnesium alloy; And
And heat treating the magnesium alloy,
Heat treating the magnesium alloy,
Solubilizing the magnesium alloy;
Cooling the solution-treated alloy; And
And aging the cooled alloy. ≪ Desc / Clms Page number 20 >
The method according to claim 6,
Wherein the magnesium alloy is subjected to solution treatment,
Is carried out in a temperature range of 350 to 450 < 0 > C.
8. The method of claim 7,
Wherein the magnesium alloy is subjected to solution treatment,
Wherein the magnesium alloy is carried out for 10 to 20 hours.
The method according to claim 6,
Cooling the solution-treated alloy; Quot;
And water-cooled in a range of 1 to 100 DEG C / h.
The method according to claim 6,
Aging the cooled alloy,
Is carried out in a temperature range of 150 to 250 < 0 > C.
11. The method of claim 10,
Aging the cooled alloy,
≪ / RTI > for about 15 to about 25 hours.
The method according to claim 6,
Preparing the molten metal,
Wherein the molten metal comprises 6.0 to 15.0 wt% of aluminum (Al), 0.3 to 3.0 wt% of zinc (Zn), 0.01 to 3.0 wt% of antimony (Sb), 0.01 to 3.0 wt% of strontium (Sr) 1.0 wt%, the balance magnesium (Mg), and other unavoidable impurities.
The method according to claim 6,
Casting the molten metal to produce a magnesium alloy,
A low pressure casting process, a gravity casting process, or a combination thereof.
14. The method according to any one of claims 6 to 13,
Wherein the magnesium alloy has an average crystal grain size of 20 to 70 占 퐉.
14. The method according to any one of claims 6 to 13,
Wherein the magnesium alloy has a yield strength of 130 to 160 MPa.
14. The method according to any one of claims 6 to 13,
Wherein the magnesium alloy has a tensile strength of 225 to 260 MPa.
14. The method according to any one of claims 6 to 13,
And the elongation of the magnesium alloy is 3.5 to 5.0%.
KR1020150186318A 2015-12-24 2015-12-24 Magnesium alloy for castin and method for manufacturing the same KR101797131B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109182860A (en) * 2018-11-08 2019-01-11 中信戴卡股份有限公司 A kind of magnesium alloy with high strength and ductility and preparation method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002266044A (en) * 2001-03-09 2002-09-18 Aisin Takaoka Ltd Magnesium alloy
JP2008106337A (en) * 2006-10-27 2008-05-08 Shingijutsu Kenkyusho:Kk Rolled material of magnesium alloy, and method for producing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109182860A (en) * 2018-11-08 2019-01-11 中信戴卡股份有限公司 A kind of magnesium alloy with high strength and ductility and preparation method
US11332814B2 (en) 2018-11-08 2022-05-17 Citic Dicastal Co., Ltd. High-strength and high-toughness magnesium alloy and preparation method thereof

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