WO2014106989A1 - Procédé permettant de fabriquer un alliage de magnésium extrudé et alliage de magnésium extrudé fabriqué au moyen de ce dernier - Google Patents

Procédé permettant de fabriquer un alliage de magnésium extrudé et alliage de magnésium extrudé fabriqué au moyen de ce dernier Download PDF

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Publication number
WO2014106989A1
WO2014106989A1 PCT/KR2013/009795 KR2013009795W WO2014106989A1 WO 2014106989 A1 WO2014106989 A1 WO 2014106989A1 KR 2013009795 W KR2013009795 W KR 2013009795W WO 2014106989 A1 WO2014106989 A1 WO 2014106989A1
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Prior art keywords
magnesium alloy
extruded material
billet
manufacturing
alloy extruded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2013/009795
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English (en)
Korean (ko)
Inventor
박성혁
유봉선
김하식
문병기
배준호
김영민
임창동
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Korea Institute of Machinery and Materials KIMM
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Korea Institute of Machinery and Materials KIMM
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020130083597A external-priority patent/KR101400140B1/ko
Application filed by Korea Institute of Machinery and Materials KIMM filed Critical Korea Institute of Machinery and Materials KIMM
Publication of WO2014106989A1 publication Critical patent/WO2014106989A1/fr
Priority to US14/712,609 priority Critical patent/US20150315690A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS 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
    • 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
    • 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

Definitions

  • the present invention relates to a method for producing a magnesium alloy extruded material and to a magnesium alloy extruded material prepared according to the present invention, specifically, a magnet with improved strength and elongation from a conventional extrusion method by performing compressive deformation in a predetermined amount on a homogenized billet. It relates to a method of manufacturing an alloy extrusion.
  • the main target materials are light metals such as aluminum and magnesium and alloys thereof, and their use is increasing as a new material for transportation equipment that requires high specific strength.
  • Magnesium alloy is the lightest metal material with the lowest density among the structural materials available, and it is a material that is in the spotlight due to its high specific strength and excellent properties such as mechanical workability, electromagnetic shielding, and vibration absorption ability.
  • the alloy ratio can be adjusted for each application to be used for special purposes. Therefore, research is being actively conducted for various fields such as automobile parts, aviation parts, and portable electronic devices.
  • Magnesium alloy parts are produced by casting and by casting, casting, or forging a cast billet or slab into a secondary molded product.
  • casting methods sand casting, thick casting, precision casting, die casting, and semi-molding molding techniques are used.
  • Most magnesium alloy parts are manufactured by die casting.
  • the manufacturing technology as a processing material such as a rolled material, an extruded material, and a forged material, which have excellent mechanical properties, is essential. All .
  • magnesium alloy workpiece has better strength and ductility than cast material, it has lower mechanical properties compared to commercial aluminum alloy workpiece, adding alloying elements, applying powder metallurgy, and controlling processing conditions. Many efforts are underway to improve the strength and ductility of magnesium alloy workpieces through the method.
  • Korean Patent Publication No. 10-2008-0085662 (published date: 2008.09.24) describes the mechanical strength of a magnet alloy.
  • a method for improving a method of controlling a composition of a magnesium alloy and combining a die casting casting and a plastic processing is disclosed.
  • the Republic of Korea Patent Publication No. 10-2012-0095184 (published: 2012.08.28) discloses a method for adjusting the composition of the magnesium alloy as a method for improving the mechanical strength and ductility of the magnesium alloy extrusion material, As described above, a method of simultaneously improving the strength and ductility by performing compressive deformation in a predetermined amount on the homogenized magnesium alloy billet before extrusion has not been disclosed.
  • the present inventors performed compression deformation treatment to a specific range of the homogenized magnesium alloy billetol, which was studied to prepare a method for producing a magnetite alloy extruded material having excellent strength and ductility, followed by extrusion.
  • the method of manufacturing the magnesium alloy extruded material has been completed by finding a simple method of manufacturing a magnesium alloy extruded material having improved ductility while improving mechanical strength by adding a simple compression deformation process to the general extrusion method.
  • An object of the present invention is to provide a method for producing a magnesium alloy extruded material.
  • Another object of the present invention is to provide a magnesium alloy extruded material produced according to the manufacturing method.
  • the present invention proposes to solve the above problems.
  • step 2 Casting a raw material of the magnesium alloy melted in step 1 to produce a magnesium alloy billet (step 2);
  • It provides a method of manufacturing a magnet alloy extruded material comprising the step (step 5) of extruding the compression-deformed magnet alloy billet of step 4.
  • the present invention provides a magnet alloy extrusion material produced by the above production method.
  • the present invention provides an airborne part manufactured using the magnesium alloy extruded material.
  • the extruded material is extruded to produce a magnesium alloy extruded material, which is a simple compression deformation process in the general extrusion method
  • a simple compression deformation process in the general extrusion method
  • FIG. 1 is a simplified view showing a method of manufacturing a magnesium alloy extruded material according to the present invention.
  • Figure 2 is a result of analyzing the magnesium alloy billet before and after room temperature compression deformation using an optical microscope.
  • Electron back scattered diffraction (EBSD) analysis showing inverse pole figure maps and twin boundary maps.
  • FIG. 5 shows electron backscattering diffraction (EBSD) showing an inverse pole figure map and a grain size distribution of the magnesium extruded materials of Example 1 and Comparative Example 1 according to the present invention.
  • EBSD electron backscattering diffraction
  • FIG. 6 shows the results of analyzing the magnesium alloy extruded materials of Examples 1 to 3 and Comparative Examples 1 to 3 according to the present invention using an optical microscope.
  • 7 is a result of analyzing the magnesium alloy extruded material of Examples 4 to 6 and Comparative Examples 4 to 6 according to the present invention using an optical microscope.
  • the present invention provides a
  • step 2 Casting a raw material of the magnesium alloy melted in step 1 to produce a magnesium alloy billet (step 2);
  • step 4 Compressing and straining the homogenized magnesium alloy billet of step 3 in the range of 3-20% (step 4);
  • It provides a method for producing a magnesium alloy extruded material comprising the step (step 5) of extruding the compression-modified magnesium alloy billet of step 4.
  • the step 1 is a step of melting the raw material of the magnesium alloy.
  • the raw material of the magnet alloy can be used without limitation as long as the commercial magnet alloy.
  • the present invention is a technology using a point that twins are easily generated due to the lack of a slim system at room temperature deformation is applicable to all magnesium alloys regardless of the composition. That is, the magnesium alloy raw material may use a magnesium pure metal or a magnesium alloy, and may be used without limitation in composition.
  • the present invention is not only a magnet alloy, but also titanium (Ti), zinc (), cobalt (Co) having a dense hexagonal structure (Hexagonal close packed (HCP)) that is easily generated due to deformation. The same can be applied to alloys, etc.
  • Step 2 is to prepare a magnesium alloy billet by casting the raw material of the molten magnesium alloy melted in step 1.
  • molten metal alloy ⁇ the raw material of the molten magnesium alloy of the step 1 (hereinafter referred to as molten metal alloy ⁇ ) at 650-750 ° C.
  • molten metal alloy ⁇ the raw material of the molten magnesium alloy of the step 1
  • the method of casting the magnesium alloy molten metal is not particularly limited as long as it is a method commonly used in the art, for example, gravity casting, continuous casting, sand casting, pressurized casting can be used.
  • step 3 is a step of homogenizing the magnesium alloy billet prepared in step 2.
  • the homogenization can improve the heterogeneous structure due to segregation of alloy elements generated in the casting of magnesium alloy moltenol, and improve the high temperature workability and mechanical properties of the magnesium alloy.
  • the homogenization of the magnesium alloy billet is preferably carried out by a cooling process after performing a heat treatment process at 300-550 ° C for 0.5-96 hours, the homogenization treatment temperature range is a magnesium alloy billet. Can be appropriately selected by those skilled in the art according to the type of member.
  • Mg-Sn-based alloy it is preferable to treat it as homogenization at 400-550.
  • the magnesium alloy billet is carried out at less than 400 ° C, the content of tin dissolved in the magnesium matrix is small, so that the strengthening effect of the alloy due to dynamic precipitation during high temperature plastic processing such as extrusion, rolling, forging, etc. is not significant. Since the coarse Mg 2 Sn phase generated during the casting process is not removed sufficiently, the ductility of the magnesium alloy may be lowered.
  • the magnesium alloy has a higher homogenization treatment temperature compared to the solidus temperature of the magnesium alloy. There is a problem that the local dissolution of the billet may occur and the physical properties may be lowered.
  • the homogenization treatment of the magnesium alloy billet is performed in the temperature range for less than 0.5 hour, diffusion of the alloying elements does not sufficiently occur, so that the effect of the homogenization treatment does not appear.
  • the homogenization treatment of the magnesium alloy billet is performed for more than 96 hours, the increase in the effect against the execution time is not so large that it is not economical.
  • the step 4 is a step of compressively deforming the homogenized magnesium alloy billet of the step 3 in the range of 3-20%.
  • the compressive strain forms twins in the homogenized magnet alloy material.
  • twins play an important deformation mechanism at room temperature of the magnesium alloy.
  • the twin formed through the compression deformation acts as a region in which recrystallization occurs in the subsequent extrusion step to increase the recrystallization fraction to create a homogeneous and fine structure to improve the strength of the magnesium alloy.
  • the fraction of the large, non-recrystallized crystal grains, which easily generate cracks during tensile deformation decreases soft ducts, and is greatly reduced by extrusion after performing compression deformation, thereby improving strength as well as elongation.
  • compressive deformation of the homogenized magnesium alloy billet is performed at less than 3%, only a very small amount of twins are formed in the magnesium alloy billet, thereby increasing the strength and elongation of the magnesium alloy extruder manufactured therefrom.
  • the compression deformation may be carried out by appropriately selecting the compression deformation range of the skilled person according to the composition of the magnesium alloy.
  • the compression deformation may be performed in any direction with respect to the magnesium alloy billet, and those skilled in the art may appropriately select the compression deformation direction according to the shape and extrusion conditions of the billet.
  • the compression deformation of the step 4 is carried out in a temperature range of room temperature to 250 ° C. Can be. If the compression deformation is performed at a temperature lower than room temperature, a defect such as cracking or cracking may occur in the magnet alloy billet while the material is hardened to perform compression deformation. In addition, when the compression deformation is performed at a temperature exceeding 250 ° C. non-base slip is activated to form twins, and thus it is difficult to expect an improvement in strength and elongation of the magnesium alloy extruded material. have.
  • the "room temperature" described as the temperature at which the compressive deformation may be performed means a normal temperature at which the heating is not particularly performed and is defined as a temperature range of about 0 to 50 ° C. For example, it may be a temperature of about 20 ° C 5 ° C.
  • the manufacturing method of the magnesium alloy extruded material according to the present invention does not require a new device and equipment except for a device for performing compression deformation. Therefore, there is an advantage that can be immediately applied to the process of manufacturing a magnesium alloy extruded material using a conventional extrusion method.
  • the step 5 is a step of extruding the compression-modified magnesium alloy billet of the step 4.
  • the extrusion is preferably carried out after preheating at 150-450 ° C to smoothly perform the extrusion of the compression-modified magnesium alloy billet of the step 4.
  • the preheating temperature of the compression-modified magnesium alloy billet is less than 150 ° C, there is a problem that excessive extrusion force is required during extrusion of the compression-deformed magnet alloy billet.
  • the pre-heating temperature exceeds 450 ° C, there is a problem that the strength of the magnesium alloy extruded material produced by the coarse growth of crystals in the magnet alloy decreases, and in some alloys due to the high extrusion temperature depending on the alloy composition There is a problem in that local melting occurs and surface defects occur.
  • the extrusion may use direct extrusion, indirect extrusion, continuous extrusion, etc., but is not limited thereto, and may be appropriately selected according to the purpose or the purpose of those skilled in the art.
  • the method for producing a magnesium alloy extruded material according to the present invention is carried out in step 4 above.
  • the method may further include processing the magnet alloy billet in a form suitable for performing compression deformation and extrusion.
  • the method for producing a magnesium alloy extruded material according to the present invention may further perform the step of aging after step 5.
  • the aging treatment is only optional. Even if the aging treatment is not performed, the magnesium alloy extruded material having improved strength and ductility can be manufactured.
  • alloy elements other than magnesium contained in magnesium atoms are precipitated in grain boundaries or grain boundaries, thereby further enhancing the strength of the magnesium alloy extruded material due to the precipitation strengthening effect.
  • the aging treatment can be performed at 150-250 ° C for 1-360 hours.
  • the aging treatment is performed at less than 150, there is a problem that the magnesium alloy takes a long time to reach the maximum strength, which is not economical.
  • the aging treatment is carried out in excess of 250 ° C it is possible to shorten the time it takes for the magnesium alloy to reach the maximum strength, but the strength of the magnesium alloy is low because the precipitated phase is coarse There is a problem.
  • the present invention provides a magnet alloy extruded material produced by the manufacturing method.
  • the properties of magnesium alloys are determined by the product of tensile strength and total elongation (TSXEL).
  • TSXEL total elongation
  • the magnesium alloy can be judged from two aspects of strength and ductility.
  • the magnesium alloy having a large TSXEL value may be determined to have excellent tensile properties.
  • the value may be determined to be excellent in toughness because it is proportional to the amount of energy absorbed by the metal material during fracture.
  • the present invention provides a component for transportation equipment manufactured using the magnesium alloy extruded material.
  • the magnesium alloy extruded material manufactured by extruding the homogenized magnesium alloy billet according to the present invention after compressive deformation treatment to a specific range has a TSXEL value of about 3-. Increasing the strength by 32%, the overall tensile properties are not just improved, but it is expected to be widely used in various industrial fields including the transportation equipment industry such as aircraft and the electronic parts industry.
  • magnesium extruded materials can exhibit excellent properties such as machinability, electromagnetic shielding, and vibration absorbing ability as well as high specific strength, and thus can be manufactured as aviation components requiring specific strength and sophisticated processing.
  • Step 1 Melting the raw material of the magnesium alloy
  • the magnesium alloy was dissolved in a crucible by using a high frequency induction melting furnace. A mixed gas of SF 6 and CO 2 was applied to the molten magnesium alloy (magnesium alloy molten metal) to block contact with the atmosphere to prevent oxidation.
  • the magnesium alloy molten metal of step 1 was maintained at 700 ° C. for 10 minutes and a magnesium alloy billet having a diameter of 80 mm and a length of 200 mm was prepared using a steel mold preheated to 200 ° C. ⁇ 97>
  • Magnesium alloy billet prepared in step 2 was heated to a rate of 1 ° C / min in an inert atmosphere and heat treated at 400-490 ° C for 12-15 hours to homogenize.
  • in order to suppress the formation of coarse precipitated phase that may occur during the billet process of the billet was treated with water at room temperature.
  • the homogenization treatment conditions according to each example are shown in Table 2 below.
  • Step 4 Performing compression deformation
  • step 3 the homogenized magnesium alloy billet was compressed by 10% in the longitudinal direction from silver to a strain rate of about 0.1 / s using a 150 ton hydraulic press.
  • the magnesium alloy extruded material was manufactured by extruding the rod into a rod of 16 mm using an indirect extruder (maximum pressure output: 500 tonf) after processing into a rod of 51 ⁇ of compression-modified magnesium alloy billetol in step 4.
  • Magnesium alloy extruded material was prepared in the same manner as in Example 4, except that compression deformation was performed at 5% in Step 4 of Example 4.
  • Phase 3 of Example 4 was repeated except that compression strain was performed at 15%.
  • a magnet alloy extruded material was prepared in the same manner as in Example 4.
  • Mg alloy extruded material was manufactured in the same manner as in Example 4, except that compression deformation was performed at 2% in Example 4 of Example 4.
  • FIG. 2 and FIG. 3 show the results of analyzing before and after compression deformation of the homogenized magnesium alloy billet using an optical microscope. From this, it can be seen that twins are formed in the magnesium alloy material by compression deformation.
  • FIG. 4 shows the results of analysis of the compressive deformation of the homogenized heat-treated A231 magnesium alloy billet using the electron back-scattering diffraction diffraction column, where many twins are formed, and these twins are mostly ⁇ 10-12 ⁇ tensile twins. have.
  • twins can be formed in the magnesium alloy material by compressive deformation of the homogenized magnesium alloy billet.
  • the magnesium alloy extruded material of Examples 1-6 and Comparative Examples 1-6 were analyzed using an optical microscope and an electron scattering diffraction diffraction. The results are shown in FIGS. 5, 6 and 7.
  • FIG. 5 is a result of analyzing the magnesium alloy extruded materials of Comparative Example 1 and Example 1 using electron backscattering diffraction diffraction.
  • Example 1 which was subjected to compression deformation, recrystallization occurred throughout the material to have uniform and fine grains. This reduced the average grain size of the extruded material from 10.3 urn to 3.1 urn due to compression deformation.
  • the magnesium alloy extruded materials of Examples 1 to 6, which performed compression deformation had a recrystallized area as compared with the magnet alloy extruded materials of Comparative Examples 1-6, which did not perform compression deformation. More and more homogeneous tissue was shown. This result for the magnesium alloy extrudates of Examples 1-6 can be determined to be due to the twins formed by compression deformation acting as recrystallization sites in the extrusion process to improve the recrystallization fraction.
  • Example 1- In order to evaluate the mechanical properties of the magnet alloy according to the present invention, Example 1-
  • a rod-shaped specimen having a gauge length of 25 mm and a gauge diameter of 6 mm was prepared using a magnesium alloy extruded material of 6, and the rod-shaped specimen was tensile at a strain rate of 1 ⁇ 10 ⁇ 3 S _1 using a room temperature tensile tester (INSTRON 4206).
  • INSTRON 4206 room temperature tensile tester
  • the magnesium alloy extruded material of Examples 1 to 8 according to the present invention has a maximum yield strength as compared with the magnesium alloy extruded material of Comparative Examples 1 to 6, which do not perform compression deformation after homogenizing. 39 MPa, tensile strength is up to 32 MPa, elongation is 22%. In addition, it can be seen that the TSXEL value, which is a factor for evaluating the physical properties of the magnet alloy extruded material, was improved by up to about 32%.
  • Example 8 it can be seen that the compressive strain to 15% to improve the yield strength 46 MPa, the tensile strength is 45 MPa, the elongation is improved by 2.2%. From this, it can be seen that the manufacturing method of the magnesium alloy extruded material according to the present invention can improve the strength and ductility of the magnesium alloy extruded material by compressing the homogenized magnesium alloy billet to a specific range and then extruding it. It can be seen that an extrusion material having excellent physical properties can be produced by increasing the amount of compression deformation.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Extrusion Of Metal (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

La présente invention se rapporte à un procédé permettant de fabriquer un alliage de magnésium extrudé et à un alliage de magnésium extrudé fabriqué au moyen ce dernier. La présente invention se rapporte, de façon précise, à un procédé permettant de fabriquer un alliage de magnésium extrudé qui comprend une étape (la première étape) consistant à faire fondre un matériau de départ d'un alliage de magnésium ; une étape (la deuxième étape) consistant à couler le matériau de départ de l'alliage de magnésium fondu au cours de la première étape afin de préparer une billette d'alliage de magnésium ; une étape (la troisième étape) consistant à soumettre la billette d'alliage de magnésium préparée au cours de la deuxième étape à un traitement d'homogénéisation ; une étape (la quatrième étape) consistant à permettre à la billette d'alliage de magnésium homogénéisée au cours de la troisième étape de subir une déformation de compression dans la plage allant de 3 à 20 % ; et une étape (la cinquième étape) consistant à extruder la billette d'alliage de magnésium qui a subi la déformation de compression au cours de la quatrième étape ; et à un alliage de magnésium extrudé fabriqué au moyen de ce procédé.
PCT/KR2013/009795 2013-01-04 2013-10-31 Procédé permettant de fabriquer un alliage de magnésium extrudé et alliage de magnésium extrudé fabriqué au moyen de ce dernier Ceased WO2014106989A1 (fr)

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US14/712,609 US20150315690A1 (en) 2013-01-04 2015-05-14 Method for manufacturing extruded magnesium alloy and extruded magnesium alloy manufactured thereby

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KR1020130001125 2013-01-04
KR10-2013-0001125 2013-01-04
KR1020130083597A KR101400140B1 (ko) 2013-07-16 2013-07-16 마그네슘 합금 압출재의 제조방법 및 이에 따라 제조되는 마그네슘 합금 압출재
KR10-2013-0083597 2013-07-16

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CN108642417A (zh) * 2018-05-25 2018-10-12 湖南工学院 一种超细晶Mg-3Al-1Zn合金短流程制备方法

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KR100723630B1 (ko) * 2006-03-02 2007-06-04 지성알미늄주식회사 자동차 에어컨용 알루미늄 합금소재 제조방법과 그로부터 제조되는 알루미늄 합금소재를 이용한 자동차 에어컨용 서브쿨재 제조방법
KR20090121792A (ko) * 2008-05-23 2009-11-26 주식회사 지알로이테크놀로지 정적 재결정법을 이용한 미세립 마그네슘 합금 압연 판재의제조방법
KR20120095184A (ko) * 2011-02-18 2012-08-28 한국기계연구원 이방성이 낮은 고강도 고연성 마그네슘 합금 압출재 및 그 제조방법

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CN108642417A (zh) * 2018-05-25 2018-10-12 湖南工学院 一种超细晶Mg-3Al-1Zn合金短流程制备方法

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