WO2012096432A1 - 발화저항성과 기계적 특성이 우수한 마그네슘 합금 및 그 제조방법 - Google Patents
발화저항성과 기계적 특성이 우수한 마그네슘 합금 및 그 제조방법 Download PDFInfo
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- WO2012096432A1 WO2012096432A1 PCT/KR2011/007299 KR2011007299W WO2012096432A1 WO 2012096432 A1 WO2012096432 A1 WO 2012096432A1 KR 2011007299 W KR2011007299 W KR 2011007299W WO 2012096432 A1 WO2012096432 A1 WO 2012096432A1
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- Prior art keywords
- magnesium alloy
- alloy
- weight
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- casting method
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Classifications
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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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D25/00—Special casting characterised by the nature of the product
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- 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
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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
- 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
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium as the next major constituent
Definitions
- the present invention forms a stable protective film on the surface of the molten magnesium alloy, more specifically, the surface of the molten metal, so that it can be melted and cast in the air or in an inert atmosphere in general.
- the present invention relates to a magnet alloy having excellent strength and ductility, and a method of manufacturing the same.
- Magnesium alloy is the lightest alloy with high specific strength and can be applied to various casting and processing processes, and has a wide range of applications for almost all fields requiring weight reduction such as automobile parts and electromagnetic parts.
- Magnesium alloys are electrochemically low-potential and highly active metals, which still have limitations in terms of material stability and reliability, such as strong reaction reactions when oxygen black is in contact with water and sometimes fire. For this reason, its application range is still limited compared to its application potential, and it cannot be used especially for the safety field requiring safety.
- inert atmospheres such as flux or C0 2 + SF 6 must be used for dissolution. Since the flux used for dissolution and refining is chlorine-based, if the melt treatment conditions are not met, residual chlorine remains inside the material and greatly degrades corrosion resistance. Instead of using fluxes to solve these shortcomings, it is effective to melt and cast SF 6 , CO 2 and Air in a mixed atmosphere. However, SF 6 is expected to be regulated in the future as it is classified as a global greenhouse-induced substance whose global greenhouse effect is 24 times that of C0 2 .
- an object of the present invention is to provide a magnesium alloy for solving the above conventional problems.
- an object of the present invention is to provide a magnesium alloy containing Ca and Y, and having an excellent ignition resistance and excellent tensile properties at the same time.
- an object of the present invention is to provide a magnesium alloy that enables an environment-friendly manufacturing process using a minimum of Ca and Y and at the same time does not use a protective gas that is an environmental pollutant such as SF 6 .
- Magnesium alloy according to the present invention for achieving the above object is more than 7.0 wt 3 ⁇ 4> and less than 9.5 wt% A1, 0.05 wt% to 2.0 wt 3 ⁇ 4 Ca, 0.05 wt% to 2.0 wt 3 ⁇ 4 Y, 0 wt% Zn in excess of 6% by weight or less, the balance of Mg and other unavoidable impurities, and the combined content of Ca and Y is characterized in that more than 0.1% by weight to less than 2.5% by weight relative to the total weight of the total magnesium alloy.
- the content of Ca is preferably 0.1% by weight to 1.0% by weight.
- the content of Y is preferably 0.1% by weight to 1.0% by weight.
- the content of Ca and Y is 0.2 weight 3 ⁇ 4 or more of the total weight of the total magnesium alloy It is preferable that it is 1.5 weight% or less.
- the magnesium alloy preferably further comprises Mn of more than 0 wt%? 3 ⁇ 4 and 1% by weight.
- At least 7.0 wt% and less than 9.5 wt% A1 0.05 wt% to 2.0 wt% Ca, 0.05 wt% to 2.0 wt% Y, greater than 0 wt% Zn up to 6 wt%, residual Mg and other unavoidable It is characterized by consisting of impurities.
- the step of adding the raw material of Ca and Y to the molten metal alloy molten metal is preferably added to the raw material of Ca and Y at a temperature higher than 800 ° C.
- the method for producing a magnesium alloy according to a preferred embodiment of the present invention for achieving the above object :
- At least 7.0 wt% and less than 9.5 wt% A1 0.05 wt% to 2.0 wt% Ca, 0.05 wt% to 2.0 wt% Y, more than 0 wt% Zn not more than 6 wt% Z, balance Mg and others It is characterized by consisting of inevitable impurities.
- the master alloy ingot containing Mg, Al, Zn, Ca and Y is soluble at 750 ° C or less, the master alloy ingot is preferably added to the magnesium alloy molten metal at a temperature lower than 750 ° C.
- At least 7.0 wt% and less than 9.5 wt% A1 0.05 wt% to 2.0 wt% Ca, 0.05 wt% to 2.0 wt% Y, greater than 0 wt% Zn at most 6 wt%, balance Mg and others It is characterized by consisting of inevitable impurities.
- the step of injecting the Ca and Y raw material, the master alloy ingot containing Mg, Al, Zn, Ca and Y, or the Ca compound and Y compound into the molten magnesium alloy molten metal periodically is preferable to further include the step of stirring.
- the casting method is one of a die casting method, a sand casting method, a gravity casting method, a pressure casting method, a continuous casting method, a sheet casting method, a die casting method, a precision casting method, a spray casting method, and a semi-ung casting method.
- the method preferably further comprises the step of hot working the magnet alloy cast material formed by the casting method.
- the reason for limiting the content of each component in the magnesium alloy according to the present invention is as follows.
- Aluminum is an element that improves the strength and flowability of the magnesium alloy and improves castability by increasing the unevenness range.
- the fraction of the Mg 17 Al 12 phase in the process increases.
- the ignition resistance increases as the aluminum content increases. Therefore, in order to satisfy not only strength but also ignition resistance at the same time, it is necessary to add more than 7% by weight of aluminum.
- the aluminum is included in the range of 7.0 weight 3 ⁇ 4 to 11.0 weight%.
- Calcium not only improves strength and heat resistance by forming Mg-Al-Ca intermetallic compounds in Mg-Al-based alloys, but also forms a thin and dense NfeO and CaO composite oxide layer on the surface of the molten metal to inhibit oxidation of the molten alloy. Improve fire resistance. However, if the calcium content is less than 0.05% by weight, the effect of improving the ignition resistance is not great. If the content of calcium is more than 2% by weight, the castability of the melt is reduced, hot cracking occurs, and the die sticking with the mold is increased. And there is a problem such as elongation is greatly reduced. Therefore, in the magnesium alloy according to the present invention, calcium is preferably included in the range of 0.05% by weight to 2.0% by weight. Yttrium (Y)
- Yttrium has a high solubility in magnesium and is mainly used as a high temperature creep improving element due to the precipitation strengthening effect.
- the fraction of the coarse scab-containing process decreases, and when it is added at about 0.4% by weight or more, A1 2 Y particles are formed to refine the grains of the casting material, thereby improving tensile properties. It works.
- a Y 2 O 3 oxide layer on the surface of the molten metal to form a mixed layer with CaO to increase the ignition resistance.
- yttrium in the magnesium alloy according to the present invention is preferably included in the range of 0.05% to 2.0% by weight 3 ⁇ 4.
- Zinc has the effect of refining grains and increasing strength when added with aluminum.
- the maximum solubility of zinc in magnesium alloy is 6.2% by weight, and if zinc is added to the magnesium alloy in excess of this, the coarse process produced during casting weakens the mechanical properties. It is preferred to be added.
- Manganese combines with Fe, an impurity element that is harmful to corrosion resistance, in Mg-Al alloys It improves the strength and improves the strength by forming Al-Mn intermetallic compound at high angle of rotation. However, when manganese is added in excess of 1.0% by weight, coarse ⁇ - ⁇ phase or AlgMn 5 phase is formed in the magnesium alloy, which deteriorates mechanical properties, and thus, manganese is preferably included in an amount of 1.0% by weight or less. Other unavoidable impurities
- the magnet alloy according to the present invention may include impurities that are inevitably introduced in the raw material or manufacturing process of the alloy.
- impurities that may be included in the magnesium alloy according to the present invention, iron (Fe), silicon (Si) and nickel (Ni) are components that play a role in deteriorating the corrosion resistance of the magnesium alloy. Therefore, the content of Fe is 0.004% by weight or less, the content of Si is 0.04 weight 3 ⁇ 4>, the content of Ni is preferably maintained to 0.001% by weight or less.
- the combined content of calcium and yttrium is in the range of 0.1% by weight or more and less than 2.5% by weight, more preferably 0.2% by weight to 1.5% by weight. It is preferred to be included above.
- Magnesium alloy according to the present invention forms a dense complex oxide layer acting as a protective coating, and is excellent in oxidation resistance and fire resistance, so that it can be melted, cast and processed in the air or general inert atmosphere (Ar, N 2 ), It is possible to suppress spontaneous ignition of chips accumulated in the machining process.
- the magnet alloy according to the present invention does not use a gas such as SF 6 is suitable for cost reduction, worker health protection, environmental pollution prevention.
- the magnesium alloy according to the present invention has an excellent ignition resistance and superior strength and ductility compared to commercial alloys at the ignition temperature of the magnesium alloy or more, and thus can be applied as a structural component material.
- the magnesium alloy according to the present invention can be manufactured as a high-strength alloy casting material that can be practically applied to not only portable electronic components such as mobile phones and laptop computers, but also next-generation automobiles, high-speed railway, urban railways.
- FIG. 1 is a view showing a change in the ignition temperature according to the addition of Ca and Y in Comparative Examples 2 to 7 and Examples 3 to 6 cast in accordance with a preferred embodiment of the present invention.
- Example 2 is a view showing the results of EPMA analysis of the molten metal oxide surface layer after maintaining the magnesium alloy of Example 4 cast in accordance with a preferred embodiment of the present invention at 670 ° C. for 10 minutes.
- FIG. 3 is a diagram schematically illustrating a structure in which a composite oxide layer formed on a solid or liquid surface of an alloy in which Ca and Y are added to block external oxygen penetration.
- a magnesium alloy and a method of manufacturing the same according to a preferred embodiment of the present invention will be described in detail below. However, the following examples are merely illustrative and do not limit the invention.
- Method for producing a magnesium alloy according to a preferred embodiment of the present invention is as follows.
- a magnesium alloy molten metal is first formed by using a raw material of Mg, A1 and Zn or an alloy thereof, and then a raw material of Ca and Y, or a Ca compound and a Y compound is introduced into the magnesium alloy molten metal, followed by appropriate casting. It is also possible to form a magnet alloy casting using the method.
- Mg, Al, Zn, Ca, and Y alloys having a higher content of Ca and Y than the final target are prepared, and separately from the raw materials of Mg, A1 and Zn or their alloys.
- the master alloy ingot may be introduced into the molten alloy molten metal to form a magnet alloy casting material.
- the mother alloy ingot can be introduced at a lower temperature than when the Ca and Y raw materials are directly added to the magnesium alloy molten metal. Particularly useful.
- the formation of a magnesium alloy according to the present invention can be implemented through a variety of methods, all of the methods of forming a magnesium alloy already well known in the art to which the present invention belongs are integrated into the present invention.
- the induction melting in this example used a graphite crucible, and the mixture of SF 6 and C0 2 was mixed to prevent oxidation of the molten metal until the alloying was finished.
- the coating was applied on the upper portion of the molten metal to prevent the molten metal from contacting the atmosphere.
- a die was cast using a steel mold without using a protective gas.
- a plate casting material having a width of 100 mm, a length of 150 mm, and a thickness of 15 mm was manufactured for a rolling test.
- a cylindrical billet having a diameter of 80 mm and a length of 150 mm was prepared for the test, and a cylindrical billet having a diameter of 55 mm and a length of 100 mm was prepared for the ignition test of the alloy casting material.
- the magnet alloy is cast using a die casting method, but various casting methods such as sand casting, gravity casting, pressure casting, continuous casting, sheet casting, die casting, precision casting, spray casting, and semi-unggo casting It can be used, the production of magnesium alloy according to the present invention is not necessarily limited to any particular casting method.
- the slabs prepared by selecting some of the alloys prepared above were subjected to homogenization heat treatment at 40 0 ° C for 15 hours.
- Comparative Example 2 Comparative Example 2, Comparative Example 6, and Example 4 of Table 1 were prepared under the conditions of temperature 20CTC, roll diameter 210mm, roll speed 5.74 mpm, and rolling reduction 30% / pass per roll. Rolling was carried out seven times in total and hot worked into a plate having a final thickness of 1 mm.
- Comparative Examples 1 and 2 of Table 1 extrude the homogenized heat-treated billets at an extrusion rate of 25: 1 at an extrusion rate of 2 m / min at an extrusion temperature of 25 ° C., respectively, and a table having a final diameter of 16 mm 3.
- the rod-like extruded material having a good cotton state was produced.
- a chip of a predetermined size was obtained by chipping the outer shell of the cylindrical billet manufactured at a constant speed of 0.5 mm depth, pitch 0.1 mm, and 350 rpm.
- the chip O.lg obtained by the above method was heated up at a constant rate into a heating furnace maintained at 1000 ° C.
- the temperature at which the rapid temperature rise starts due to the ignition was measured as the ignition temperature, and the results are shown in Table 2.
- the firing temperature values listed in Table 2 represent the average of the values measured through at least five experiments on the same composition.
- Figure 1 is a diagram showing the change in the ignition temperature according to the Ca content change of the magnesium alloy having a composition according to Comparative Examples 2 to 7 and Examples 3 to 6 prepared using the method described above.
- the double mixing layer effectively suppresses oxygen penetration into the molten metal even at a high temperature. Make your melt more stable.
- the ignition resistance of the alloy is further improved by forming a CaO and Y 2 O 3 composite oxide layer between the existing oxide layer and the surface of the alloy.
- the alloy containing 0.58% by weight of Ca and 0.21% by weight of Y is 2.1% by weight of Ca. It has the same ignition resistance as the poisoned alloy and similar tensile properties as the alloy without Ca added, which is the alloy with 0.49 wt.% Ca alone and the alloy with 0.63 wt% Ca alone. can do.
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Abstract
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/511,015 US9822432B2 (en) | 2011-01-11 | 2011-10-04 | Magnesium alloy with excellent ignition resistance and mechanical properties, and method of manufacturing the same |
JP2012552823A JP5852585B2 (ja) | 2011-01-11 | 2011-10-04 | 発火抵抗性と機械的特性に優れているマグネシウム合金及びその製造方法 |
EP11842453.0A EP2634278A4 (en) | 2011-01-11 | 2011-10-04 | MAGNESIUM ALLOY WITH EXCELLENT SPARKNESS AND MECHANICAL PROPERTIES, AND METHOD FOR THE PRODUCTION THEREOF |
CN201180005588.4A CN102753715B (zh) | 2011-01-11 | 2011-10-04 | 具有出色的抗引燃性和机械性能的镁合金及其制造方法 |
CA2777830A CA2777830A1 (en) | 2011-01-11 | 2011-10-04 | Magnesium alloy with excellent ignition resistance and mechanical properties, and method of manufacturing the same |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR10-2011-2553 | 2011-01-11 | ||
KR20110002553 | 2011-01-11 | ||
KR1020110023262A KR101080164B1 (ko) | 2011-01-11 | 2011-03-16 | 발화저항성과 기계적 특성이 우수한 마그네슘 합금 및 그 제조방법 |
KR10-2011-23262 | 2011-03-16 |
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WO2012096432A1 true WO2012096432A1 (ko) | 2012-07-19 |
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PCT/KR2011/007299 WO2012096432A1 (ko) | 2011-01-11 | 2011-10-04 | 발화저항성과 기계적 특성이 우수한 마그네슘 합금 및 그 제조방법 |
Country Status (7)
Country | Link |
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US (1) | US9822432B2 (ko) |
EP (1) | EP2634278A4 (ko) |
JP (1) | JP5852585B2 (ko) |
KR (1) | KR101080164B1 (ko) |
CN (1) | CN102753715B (ko) |
CA (1) | CA2777830A1 (ko) |
WO (1) | WO2012096432A1 (ko) |
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US20140238191A1 (en) * | 2013-02-28 | 2014-08-28 | Seiko Epson Corporation | Magnesium-based alloy powder and magnesium-based alloy molded article |
US20140238192A1 (en) * | 2013-02-28 | 2014-08-28 | Seiko Epson Corporation | Magnesium-based alloy powder and magnesium-based alloy molded article |
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JP6199190B2 (ja) * | 2014-01-10 | 2017-09-20 | 公益財団法人鉄道総合技術研究所 | マグネシウム合金の圧延材の製造方法 |
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- 2011-03-16 KR KR1020110023262A patent/KR101080164B1/ko active IP Right Grant
- 2011-10-04 EP EP11842453.0A patent/EP2634278A4/en not_active Ceased
- 2011-10-04 CN CN201180005588.4A patent/CN102753715B/zh active Active
- 2011-10-04 US US13/511,015 patent/US9822432B2/en active Active
- 2011-10-04 CA CA2777830A patent/CA2777830A1/en not_active Abandoned
- 2011-10-04 WO PCT/KR2011/007299 patent/WO2012096432A1/ko active Application Filing
- 2011-10-04 JP JP2012552823A patent/JP5852585B2/ja active Active
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US20140238191A1 (en) * | 2013-02-28 | 2014-08-28 | Seiko Epson Corporation | Magnesium-based alloy powder and magnesium-based alloy molded article |
US20140238192A1 (en) * | 2013-02-28 | 2014-08-28 | Seiko Epson Corporation | Magnesium-based alloy powder and magnesium-based alloy molded article |
US9702028B2 (en) | 2013-02-28 | 2017-07-11 | Seiko Epson Corporation | Magnesium-based alloy powder and magnesium-based alloy molded article |
Also Published As
Publication number | Publication date |
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CA2777830A1 (en) | 2012-07-11 |
CN102753715A (zh) | 2012-10-24 |
CN102753715B (zh) | 2016-05-04 |
EP2634278A4 (en) | 2014-07-09 |
JP5852585B2 (ja) | 2016-02-03 |
US9822432B2 (en) | 2017-11-21 |
US20130280121A1 (en) | 2013-10-24 |
KR101080164B1 (ko) | 2011-11-07 |
EP2634278A1 (en) | 2013-09-04 |
JP2013514463A (ja) | 2013-04-25 |
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