KR20170049084A - Mg alloy having High extrusion and extrusion method of Mg alloy - Google Patents
Mg alloy having High extrusion and extrusion method of Mg alloy Download PDFInfo
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- KR20170049084A KR20170049084A KR1020150150014A KR20150150014A KR20170049084A KR 20170049084 A KR20170049084 A KR 20170049084A KR 1020150150014 A KR1020150150014 A KR 1020150150014A KR 20150150014 A KR20150150014 A KR 20150150014A KR 20170049084 A KR20170049084 A KR 20170049084A
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- magnesium alloy
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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
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
-
- 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
-
- 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
Description
More particularly, the present invention relates to a method of extruding a magnesium alloy and a high-pressure-generating magnesium alloy for use in transportation equipment parts, electronic equipment parts, and industrial products.
Light weight of transportation equipment such as airplane and high-speed railway for environment load and energy reduction and weight reduction of electronic devices which require portability such as mobile phone, tablet PC, and notebook and light weight in various fields such as heat sink, Is in progress. Among them, the magnesium alloy has the lowest specific weight among the practical structural materials and the excellent non-strength, and thus the demand for the lightweight material is increasing.
The study of conventional magnesium alloys has focused on magnesium alloys for casting for application to parts of automobiles and IT products based on excellent casting of magnesium. However, recently, magnesium alloys for processing, which can be more variously applied to light- Alloys have been actively studied.
In particular, studies on Mg-Zn-based high-strength magnesium alloys have been actively carried out, but conventional studies (KR100435325, KR100452263, KR100519721, KR100916194, KR100993840, KR101191438, KR101252784, KR100994812, KR101277297) Which is the most important magnesium alloy in the world.
In addition, in the case of the AZ31 alloy, which is a typical alloy for a new material developed in the past, there is a problem that it is difficult to increase the extrusion speed because the surface of the product disappears due to the surface oxidation generated at the high speed. Further, there is a problem that surface processing is required after extrusion, which increases process cost. Therefore, there is an increasing need to develop a magnesium alloy for extrusion that has excellent extrudability and has a smooth surface.
Disclosure of Invention Technical Problem [8] The present invention is directed to a method for extruding high-pressure magnesium alloy and magnesium alloy, which can increase the extrusion speed, and which has high surface pressure while extruding at high speed. However, these problems are exemplary and do not limit the scope of the present invention.
According to one aspect of the present invention, there is provided a high-pressure-casting magnesium alloy. The high-pressure-cast magnesium alloy contains 2.5 to 3.5% by weight of zinc (Zn), 0.3 to 1.5% by weight of manganese (Mn) and 0.3 to 1.0% by weight of calcium (Ca), the remainder consisting of magnesium and unavoidable impurities .
The high-pressure-dischargeable magnesium alloy may be at least one selected from the group consisting of aluminum (Al), silicon (Si), zirconium (Zr), silver (Ag), lithium (Li), titanium (Ti), beryllium (Be), tin 0.001 to 1.0% by weight of one or more elements selected from the group consisting of rare earth metals, scandium (Sc), barium (Ba), yttrium (Y) and rare earth metals.
According to another aspect of the present invention, a magnesium alloy extruded material is provided. Wherein the magnesium extrudate comprises 2.5 to 3.5 wt% zinc, 0.3 to 1.5 wt% manganese, and 0.3 to 1.0 wt% calcium, the remainder comprising magnesium and unavoidable impurities, The size of the recrystallized grains is in the range of 5 탆 to 20 탆, and the microstructure having the second phases dispersed along the direction of extrusion may be mixed.
The magnesium alloy extruded material may be at least one selected from the group consisting of Al, Si, Zr, Ag, Li, Ti, Ber, Sn, And may further contain 0.001 to 1.0% by weight of one or more elements in the group consisting of scandium (Sc), barium (Ba), yttrium (Y) and rare earth metals.
According to another aspect of the present invention, a method for high-speed extrusion of a magnesium alloy is provided. The high-speed extrusion method of the magnesium alloy includes: preheating the magnesium alloy billet; And extruding the billet. The casting material may include magnesium alloy containing 2.5 to 3.5 wt% of zinc, 0.3 to 1.5 wt% of manganese (Mn) and 0.3 to 1.0 wt% of calcium (Ca), and the balance of magnesium and unavoidable impurities And the extrusion speed may range from 5 m to 9 m per minute.
The high-speed extrusion method of magnesium alloy further includes a step of homogenizing the casting material before the step of preheating the casting material, wherein the homogenizing step comprises maintaining the casting material at 300 to 400 ° C for 6 to 48 hours . ≪ / RTI >
In the high-speed extrusion of the magnesium alloy, the preheating may include heating the cast material at 200 to 400 ° C for 20 minutes to 2 hours.
According to one embodiment of the present invention as described above, it can be used as a material for manufacturing transportation parts, portable electronic parts and various industrial parts for energy and environmental load reduction, and can be extruded at high speed, It is possible to realize a method of extruding a highly pressurized magnesium alloy and a magnesium alloy. Of course, the scope of the present invention is not limited by these effects.
FIG. 1 is a process flowchart schematically showing a method of extruding a magnesium alloy according to an embodiment of the present invention.
2 is a photograph of the surface of the magnesium alloy samples of Example 1 and Comparative Example 1 of the present invention.
FIG. 3 shows the measurement results of the mechanical properties of the magnesium alloy samples according to Examples and Comparative Examples of the present invention.
4 is a result of an optical microscope analysis of the microstructure of the magnesium alloy sample of Example 2 of the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the 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. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Also, for convenience of explanation, the components may be exaggerated or reduced in size.
FIG. 1 is a process flowchart schematically showing a method of high-speed extrusion of a magnesium alloy according to an embodiment of the present invention.
Referring to FIG. 1, a high-speed extrusion method (S100) of a magnesium alloy includes homogenizing a magnesium alloy casting material (S110), preheating a magnesium alloy casting material (S120), and extruding the casting material (S130) . The casting material may include magnesium alloy containing 2.5 to 3.5 wt% of zinc, 0.3 to 1.5 wt% of manganese (Mn) and 0.3 to 1.0 wt% of calcium (Ca), and the balance of magnesium and unavoidable impurities . In the case of extruding using the magnesium alloy casting material having such a composition, the extrusion speed in the extruding step may be not less than 5 m per minute, more specifically not less than 5 m and not more than 9 m per minute.
According to the present invention, when extruded using the cast material having the above-mentioned magnesium composition, high-speed extrusion of 5 m or more per minute is possible, which is remarkably higher than the conventional method.
The magnesium alloy casting material is manufactured by casting a magnesium alloy melt, and may be cast in a billet form or cast into a billet form.
The magnesium alloy melt may contain 2.5 to 3.5% by weight of zinc, 0.3 to 1.5% by weight of manganese and 0.3 to 1.0% by weight of calcium, have. Here, the impurities mean other impurities that are inevitably mixed in a small amount during the alloying process and the product manufacturing process.
The reason why the addition of the respective alloying elements and the content are limited will be described in detail as follows.
Zinc (Zn) contained in the alloy melt is the most effective element for improving the strength after aluminum (Al). It forms a precipitate phase by heat treatment together with zirconium (Zr) and rare earth metals, .
In the present invention, when zinc is added in an amount of less than 2.5% by weight, desired strength can not be obtained. On the other hand, when zinc is added in an amount exceeding 3.5% by weight, the initial melting incipient-melting occurs, which is not only difficult to apply to processes such as extrusion, but may also result in deterioration of mechanical properties. Therefore, in the present invention, the addition range of zinc is preferably limited to a range of 2.5 to 3.5% by weight.
Further, manganese (Mn) contained in the molten alloy can reduce the precipitation phase of the magnesium (Mg) -zinc (Zn) based alloy to improve the strength and elongation, and improve the corrosion resistance. Generally, manganese should be added in an amount of 0.3 wt% or more to obtain the above-mentioned effect. On the other hand, when the content of manganese exceeds 1.5% by weight, coarse manganese particles are formed in the molten metal at a temperature of about 750 ° C or less, resulting in deterioration of the mechanical properties of the alloy. Therefore, in the present invention, the addition range of manganese is preferably limited to the range of 0.5 to 1.5 wt%.
Further, the calcium (Ca) contained in the molten alloy improves the resistance to oxidation and ignition of the magnesium alloy, and forms phases such as Ca-Mg-Zn, Mg-Ca and the like, so that the strength is improved. In the present invention, when the content of calcium (Ca) is less than 0.3 wt%, it does not contribute to the inhibition of surface oxidation at a high temperature. On the other hand, if it exceeds 1.0 wt%, the extrudability decreases and the mechanical properties deteriorate. Therefore, in the present invention, the addition range of calcium is preferably limited to the range of 0.3 to 1.0% by weight.
Calcium contained as an alloying element in the high-pressure-casting magnesium alloy according to an embodiment of the present invention is a method of directly adding metal calcium to a magnesium melt forming a matrix of a high-thermal conductivity magnesium alloy for extrusion, , A method using a mother alloy prepared by adding calcium oxide to magnesium, and a method using a mother alloy prepared by adding metal calcium to magnesium.
The molten alloy may be at least one selected from the group consisting of Al, Si, Zr, Ag, Li, Ti, Ber, Sn, 0.001 to 1.0% by weight of one or more elements selected from the group consisting of scandium (Sc), barium (Ba), yttrium (Y) and rare earth metals.
For example, when aluminum (Al) is added, strength and hardness are increased, the flowability of the alloy during casting is improved, the coagulation range is increased and the casting is improved, and the handling of the melt And the heat conduction is much lowered.
In addition, very small amounts of beryllium (Be), for example about 0.001 wt% beryllium, can effectively reduce the oxidation of molten magnesium during casting or welding. Tin (Sn) has an effect of suppressing the occurrence of cracks during hot working and therefore has an effect of increasing the elongation.
Zirconium (Zr) can improve the elongation by reducing the grain size of the magnesium alloy. Zirconium has a lattice constant similar to that of magnesium, so that the zirconium particles formed upon dissolution provide a nucleation site of magnesium in the solidification process, and the addition of zirconium, zinc, rare metals, etc. may also have the effect of refining the crystal grains.
In addition, the rare metals are added to the magnesium alloy to improve the strength of the alloy. The rare metals are usually added in the form of misch metal, which is a mixture of cerium rare earth elements and means a semi-finished product of the smelting process. In general, the term "misch metal" includes about 40 to 50% of cerium (Ce) and about 20 to 40% of lanthanum (La). However, a rare metal element not subjected to a smelting process other than the above-mentioned mischmetal may be added.
In addition, when the content of aluminum is relatively low, the rare metal has an effect of forming a stable Al-RE intermetallic compound at a high temperature when it is added, and being formed at the time of solidification to improve strength and heat resistance at high temperature. At this time, the degree of improvement in the strength and heat resistance at high temperature depends on the ratio of aluminum and rare metal, and the rare metal may function to suppress the generation of cracks and pores during welding.
Particularly, in the case of yttrium (Y), the precipitation strengthening effect has an effect of improving the creep property at high temperature. The Mg-Y binary alloy does not have a large precipitation strengthening effect, and when yttrium (Y) However, when a small amount of yttrium (Y) is added, the thermal conductivity is better than that of conventional commercial alloys, and the strength is significantly improved. Therefore, Mg-Nd based or Mg-Y-Nd based intermetallic compounds precipitate when a rare metal element including neodymium (Nd), for example, is added and then heat-treated so that high temperature strength, oxidation resistance and creep resistance Can be effectively improved.
The step of preheating the cast material includes heating at a temperature of 200 ° C to 400 ° C for 20 minutes to 2 hours.
Meanwhile, the method of high-speed extruding a magnesium alloy according to an embodiment of the present invention may further include a step of homogenizing the cast material prior to the step of preheating the cast material. The homogenization may be performed by maintaining the cast material at 300 to 400 ° C for 6 to 48 hours and cooling the cast material by any one or more of water cooling, air cooling and furnace cooling.
In general, since magnesium alloy can not secure workability at room temperature, high-temperature processing is performed to obtain a sound body material, and the processing temperature is set within a range in which soundness of the body material can be ensured through experiments.
Hereinafter, an experimental example to which the technical idea described above is applied will be described in order to facilitate understanding of the present invention. It should be understood, however, that the following examples are for the purpose of promoting understanding of the present invention and are not intended to limit the scope of the present invention.
As a sample according to an experimental example of the invention, zinc (Zn), manganese (Mn), calcium (Ca), aluminum (Al) and magnesium (Mg) The sample was melted in a steel crucible using a conventional electric resistance furnace, and then a billet was produced using a steel mold preheated to a temperature of about 150 ° C to 200 ° C.
Thereafter, the prepared billet is homogenized for 6 to 48 hours at a temperature of 300 ° C to 400 ° C, preheated at 200 ° C to 400 ° C for 20 minutes to 2 hours, extruded at the same temperature zone To prepare magnesium alloy extruded material samples of Examples 1 to 4. The extruded sample was then subjected to a room temperature tensile test at a speed of 1 mm / min. By machining a rod-like specimen having a gage length of 30 mm and a diameter of 6 mm in the same manner as the 14A test specimen of KS B 0801. Further, in the extrusion process, the average RAM speed of the extruder was measured, and the extrusion rate of the product was measured by multiplying by the extrusion ratio.
For comparison, a magnesium alloy extruded material sample of Comparative Example 1 in which no alloy component of calcium (Ca) was present was prepared as compared with the magnesium extruded alloy samples of Examples 1 to 4, and a commercially available magnesium alloy The thermal conductivity and the tensile strength were measured in the same manner as in the above Experimental Example using a magnesium alloy extruded material sample of Comparative Example 2 (AZ31B).
2 is a photograph of the surface of the magnesium alloy extruded material samples of Example 1 and Comparative Example 1 of the present invention.
Referring to Fig. 2, surface oxidation was not generated in the magnesium alloy extruded material sample of Example 1 of the present invention. On the other hand, in the magnesium alloy extruded material sample of Comparative Example 1, surface oxidation occurred in the extrusion process. This can be understood from the fact that the calcium (Ca) added to the sample in the magnesium alloy extruded material of Example 1 improved the oxidation resistance of the magnesium alloy.
3 shows the results of measurement of the mechanical properties of samples of the magnesium alloy extruded material according to Examples and Comparative Examples of the present invention and Table 2 summarizes the mechanical properties and the results of measurement of the maximum extrusion speed of Examples and Comparative Examples of the present invention .
(MPa)
(MPa)
(%)
(m / min)
Referring to FIG. 3 and Table 2, it can be seen that the extrusion rate in all the samples satisfies the speed of 5 m or more per minute. It was also confirmed that tensile strengths of 250 MPa or more were satisfied in all of the samples. In the magnesium alloy extruded material samples of Examples 1 to 4 of the present invention, surface oxidation did not occur, but magnesium of Comparative Example 1 and Comparative Example 2 Alloy extrudate samples were surface oxidized at high temperature. As described above with reference to Fig. 2, it can be seen that in the case of the examples, oxidation is suppressed by calcium (Ca) contained in the sample of the magnesium alloy extrudate.
4 is a result of an optical microscope analysis of the microstructure of the magnesium alloy extruded material sample of Example 2 of the present invention.
Referring to FIGS. 4 and 2, it can be seen from the analysis of the microstructure of Example 2 that the grains that were not dynamically recrystallized during the extrusion process and the grains in which the dynamic recrystallization occurred are mixed. At this time, the size of the recrystallized grains is as small as 5 to 20 mu m. Further, the second phases are distributed in parallel to the extrusion direction. Therefore, it shows a high yield strength due to the strengthening effect by the fine grain size and the strengthening effect of the second phases.
The productivity can be improved by increasing the extrusion speed in the extrusion process. However, when the extrusion speed is increased, surface oxidation occurs due to a rapid temperature rise on the surface. Since the extruded material having such a surface oxidation becomes poor in mechanical properties, it is difficult to realize high-speed extrusion.
However, as described above, the high-pressure-cast magnesium alloy according to the embodiments of the present invention contains 2.5 to 3.5 wt% zinc (Zn), 0.3 to 1.5 wt% manganese (Mn), and 0.3 to 1.0 wt% ), It can be understood that extrusion at a high speed of 5 m or more per minute is possible.
Accordingly, when the magnesium alloy according to the present invention is used, high productivity can be achieved because high-speed extrusion can not be realized in the conventional magnesium alloy. The extruded material made of the magnesium alloy according to the present invention can be used as materials for manufacturing transportation parts, portable electronic parts and various industrial parts for energy and environmental load reduction.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.
Claims (7)
High pressure magnesium alloy.
(Si), zirconium (Zr), silver (Ag), lithium (Li), titanium (Ti), beryllium (Be), tin (Sn), strontium (Sr), scandium (Sc) And further contains 0.001 to 1.0% by weight of at least one element in the group consisting of barium (Ba), yttrium (Y) and rare earth metals.
High pressure magnesium alloy.
Wherein the size of the recrystallized grains is in the range of 5 占 퐉 to 20 占 퐉 and the second phases have a microstructure in which the second phases are distributed along the direction of extrusion,
Magnesium alloy extrusion material.
(Si), zirconium (Zr), silver (Ag), lithium (Li), titanium (Ti), beryllium (Be), tin (Sn), strontium (Sr), scandium (Sc) And further contains 0.001 to 1.0% by weight of at least one element in the group consisting of barium (Ba), yttrium (Y) and rare earth metals.
Magnesium alloy extrusion material.
And extruding the cast material,
The casting material
A magnesium alloy containing 2.5 to 3.5% by weight of zinc (Zn), 0.3 to 1.5% by weight of manganese (Mn) and 0.3 to 1.0% by weight of calcium (Ca), the balance being magnesium and unavoidable impurities,
Wherein the extruding step has an extrusion speed ranging from 5 m to 9 m per minute,
High Speed Extrusion Method of Magnesium Alloy.
Further comprising homogenizing the billet prior to preheating the cast material,
Wherein the homogenizing step comprises maintaining the billet at 300 to < RTI ID = 0.0 > 400 C < / RTI &
High Speed Extrusion Method of Magnesium Alloy.
Wherein the preheating step comprises heating the cast material at 200 to 400 占 폚 for 20 minutes to 2 hours.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017209566A1 (en) * | 2016-06-02 | 2017-12-07 | 울산과학기술원 | Magnesium alloy and method for manufacturing same |
| CN108570583A (en) * | 2018-06-08 | 2018-09-25 | 哈尔滨工业大学 | Without rare earth low-alloy ultra-high strength and toughness magnesium alloy and preparation method thereof |
| KR20190098306A (en) * | 2018-02-13 | 2019-08-22 | 서울대학교산학협력단 | Magnesium-alloy and manufacturing method thereof |
| CN112789360A (en) * | 2018-12-14 | 2021-05-11 | 蔚山科学技术院 | Magnesium alloy material and method for producing same |
| CN113234977A (en) * | 2021-05-10 | 2021-08-10 | 重庆大学 | High-corrosion-resistance Mg-Zn-Sc magnesium alloy and preparation method thereof |
| KR20220045733A (en) * | 2020-10-06 | 2022-04-13 | 주식회사 아이맥스 | Frame made of magnesium alloy materials for electric wheelchairs |
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2015
- 2015-10-28 KR KR1020150150014A patent/KR20170049084A/en not_active Application Discontinuation
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017209566A1 (en) * | 2016-06-02 | 2017-12-07 | 울산과학기술원 | Magnesium alloy and method for manufacturing same |
| US10883158B2 (en) | 2016-06-02 | 2021-01-05 | Unist (Ulsan National Institute Of Science And Technology) | Magnesium alloy materials and method for producing the same |
| KR20190098306A (en) * | 2018-02-13 | 2019-08-22 | 서울대학교산학협력단 | Magnesium-alloy and manufacturing method thereof |
| CN108570583A (en) * | 2018-06-08 | 2018-09-25 | 哈尔滨工业大学 | Without rare earth low-alloy ultra-high strength and toughness magnesium alloy and preparation method thereof |
| CN112789360A (en) * | 2018-12-14 | 2021-05-11 | 蔚山科学技术院 | Magnesium alloy material and method for producing same |
| KR20220045733A (en) * | 2020-10-06 | 2022-04-13 | 주식회사 아이맥스 | Frame made of magnesium alloy materials for electric wheelchairs |
| CN113234977A (en) * | 2021-05-10 | 2021-08-10 | 重庆大学 | High-corrosion-resistance Mg-Zn-Sc magnesium alloy and preparation method thereof |
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