EP0548875B1 - Hochfeste Legierungen auf Magnesiumbasis - Google Patents

Hochfeste Legierungen auf Magnesiumbasis Download PDF

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Publication number
EP0548875B1
EP0548875B1 EP92121691A EP92121691A EP0548875B1 EP 0548875 B1 EP0548875 B1 EP 0548875B1 EP 92121691 A EP92121691 A EP 92121691A EP 92121691 A EP92121691 A EP 92121691A EP 0548875 B1 EP0548875 B1 EP 0548875B1
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EP
European Patent Office
Prior art keywords
magnesium
alloy
based alloy
strength
exceeding
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.)
Expired - Lifetime
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EP92121691A
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English (en)
French (fr)
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EP0548875A1 (de
Inventor
Toshisuke Shibata
Akihisa Inoue
Tsuyoshi Masumoto
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YKK Corp
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YKK Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C45/00—Amorphous alloys
    • C22C45/005—Amorphous alloys with Mg as the major constituent
    • 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
    • C22C1/11—Making amorphous alloys
    • 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

  • This invention relates to high-strength magnesium-based alloys obtained by the rapid solidification method or quench solidifying method.
  • the magnesium-based alloys heretofore known to the art include those of the compositions of Mg-Al, Mg-Al-Zn, Mg-Th-Zr, Mg-Th-Zn-Zr, Mg-Zn-Zr, and Mg-Zn-Zr-RE (rare earth element).
  • these magnesium-based alloys have been finding extensive utility as light-weight structural materials for aircraft and vehicles, as materials for storage batteries, and as sacrifice electrodes, for example.
  • the conventional magnesium-based alloys of varying types cited above, however, are generally deficient in hardness and strength.
  • magnesium-based alloys of varying compositions have been developed.
  • Japanese Patent Application laid open to public inspection, KOKAI (Early Publication) No. 3-87339 (87,339/ 1991) discloses a magnesium-based alloy of Mg-M-X [wherein M stands for Al, Si, Ca, Cu, Ni, Sn, or Zn and X for Y, La, Ce, Sm, Nd, or Mm (misch metal)] and Japanese Patent Application, KOKAI No.
  • 3-10041 (10,041/1991) discloses magnesium-based alloys of Mg-X, Mg-X-M, Mg-X-Ln, and Mg-X-M-Ln (wherein X stands for Cu, Ni, Sn, or Zn, M for Al, Si, or Ca, and Ln for Y, La, Ce, Nd, Sm, or Mm).
  • These magnesium-based alloys are amorphous alloys containing at least 50% by volume of an amorphous phase.
  • Japanese Patent Application, KOKAI No. 3-47941 discloses magnesium-based alloys of Mg-X, Mg-X-M, Mg-X-Ln, and Mg-X-M-Ln (wherein X stands for Cu, Ni, Sn, or Zn, M for Al, Si, or Ca, and Ln for Y, La, Ce, Nd, Sm, or Mm).
  • X stands for Cu, Ni, Sn, or Zn
  • M stands for Al, Si, or Ca
  • Ln for Y, La, Ce, Nd, Sm, or Mm.
  • the magnesium-based alloys reported in said Japanese Patent Application, KOKAI No. 3-47941 are excellent in hardness and tensile strength, they are imperfect in terms of thermal stability and specific strength and have room for improvement. Further, said Japanese Patent Application, KOKAI No. 3-47941 has no concrete mention anywhere about magnesium-based alloys of Mg-Al-Zn.
  • An object of this invention is to provide a magnesium-based alloy which possesses high hardness, high strength, and high heat-resistance, exhibits high specific strength, and proves to be useful as high-strength material, highly heat-resistant material, and a light, strong material of high specific strength.
  • Another object of this invention is to provide a magnesium-based alloy which excels in such characteristic properties as elongation at room temperature and Young's modulus and, therefore, endures working by extrusion and forging, for example.
  • Fig. 1 is an explanatory diagram schematically illustrating the construction of an example of the apparatus for the production of a magnesium-based alloy of this invention.
  • Fig. 2 is a graph showing changes in tensile strength due to changes in the amount of Zn and the amount of Al in a Mg-Al-Zn magnesium-based alloy according to this invention.
  • the magnesium-based alloy of this invention possesses a composition of Mg a Al b Zn c and has the intermetallic compounds of Mg and other alloy elements mentioned above dispersed homogeneously and finely in a magnesium matrix of a hexagonal close-packed structure (hereinafter referred to briefly as "h.c.p.”).
  • a is limited to the range of 80 to 92 atomic %, b to that of 4 to 12 atomic %, and c to that of 4 to 12 atomic % (but not equal to 4 atomic %) respectively for the purpose of ensuring formation of a supersaturated solid solution surpassing the limit of equilibrium solid solution and production of the alloys of the microcrystalline phases by the rapidly solidifying means on a commercial basis by utilizing the liquid quenching technique, for example.
  • Another important reason for fixing the ranges mentioned above resides in ensuring precipitation of fine h.c.p. Mg and further uniform precipitation of intermetallic compounds of Mg and other alloy elements.
  • the intermetallic compounds containing at least Mg as one of the components thereof, particularly the intermetallic compounds of Mg and Zn, can be uniformly and finely dispersed in the Mg matrix of h.c.p. mentioned above, the supersaturated Mg matrix can be reinforced and the strength of the alloy can be enhanced conspicuously. Even if the amount of Mg is less than 80 atomic %, the alloy containing an amorphous phase in a certain proportion can be obtained and the amorphous phase can be decomposed by heating this amorphous alloy at a prescribed temperature.
  • the element Al manifests an excellent effect of forming a supersaturated solid solution or metastable intermetallic compound with magnesium and other additive elements and, at the same time, of stabilizing a microcrystalline phase, and enhances strength of the alloy without any sacrifice of ductility.
  • the element Zn forms a stable or metastable intermetallic compound with magnesium and other additive elements, causes this intermetallic compound to be uniformly and finely dispersed in the magnesium matrix ( ⁇ phase), conspicuously enhances hardness and strength of the alloy, suppresses the otherwise inevitable coarsening of the microcrystalline phase at elevated temperatures, and imparts heat-resistance to the alloy.
  • the element Zn, particularly in the alloy of this invention can form Mg 7 Zn 3 , an intermetallic compound capable of improving mechanical properties.
  • the alloy of the composition represented by the general formula mentioned above therefore, is desired to possess a texture having at least the intermetallic compound of Mg 7 Zn 3 uniformly and finely dispersed in a Mg matrix of h.c.p.
  • the element Zn has an effect of improving resistance to corrosion of the alloy.
  • the magnesium-based alloy of this invention can be advantageously produced by preparing the alloy of the prescribed composition and using rapidly solidifying process such as the liquid quenching method.
  • the cooling in this case is effected advantageously at a rate in the range of from 10 2 to 10 6 K/sec.
  • the magnesium-based alloy of this invention is useful as high-strength materials and highly refractory materials owing to its high hardness, strength, and heat-resistance. It is also useful as materials with high specific strength because of light weight and high strength. Since this alloy excels in elongation at room temperature and Young's modulus, it can be worked by extrusion and forging. Furthermore, this alloy endures the sharp bending work. The shaped articles produced by working this alloy, therefore, enjoy the outstanding mechanical properties which are inherent in the alloy as the starting material.
  • a molten alloy 3 of a prescribed percentage composition was prepared by the use of a high-frequency blast furnace. This molten alloy 3 was introduced into a quartz tube 1 provided at the leading terminal thereof with a small hole 5 (0.5 mm in diameter) as illustrated in Fig. 1 and thermally melted by means of a high-frequency heating coil 4 wound around the quartz tube 1. Then, the quartz tube 1 was set in place directly above a roll 2 made of copper. The roll 2 was kept rotated at a high speed in the range of from 3,000 to 5,000 r.p.m. and the molten alloy 3 in the quartz tube 1 was spouted under the pressure of argon gas (0.7 kg/cm 2 ) through the small hole 5 of the quartz tube 1. A thin alloy strip 6 was obtained by bringing the spouted alloy into contact with the surface of the roll 2 in rotation and rapidly solidifying the alloy.
  • the thin alloy strips were each subjected to X-ray diffraction and tested for such mechanical properties as hardness (Hv), tensile strength ( ⁇ f ), elongation at break ( ⁇ f ), Young's modulus (E), and specific strength ( ⁇ f / ⁇ ).
  • Hv hardness
  • ⁇ f tensile strength
  • ⁇ f elongation at break
  • E Young's modulus
  • ⁇ f / ⁇ specific strength
  • the Mg-Al-Zn alloys showed a peak of tensile strength between the Zn contents of 6 and 8 atomic % and that this strength decreased according to increasing or decreasing of Zn content from the peak. It is further noted from Fig. 2 that the strength increased with increasing Al content.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Powder Metallurgy (AREA)

Claims (4)

  1. Hochfeste magnesiumbasierende Legierung mit einer gänzlich mikrokristallinen Zusammensetzung, dargestellt durch die allgemeine Formel MgaAlbZnc, wobei a, b und c jeweils für Atomprozentwerte stehen in den Bereichen 80 ≤ a ≤ 92, 4 ≤ b ≤ 12 und 4 < c < 12 und wobei (a+b+c) = 100, und mit einer intermetallischen Verbindung von Mg und den anderen Legierungselementen, die gleichmäßig und fein in einer Mg-Matrix einer hexagonal dichtgepackten Struktur dispergiert ist.
  2. Magnesiumbasierende Legierung nach Anspruch 1, die eine Härte Hv über 97 (DPN), eine Zugfestigkeit über 328 (Mpa), eine Bruchelongation über 1,0%, einen Elastizitätsmodul über 30 (Gpa) und eine spezifische Festigkeit über 156 zeigt.
  3. Magnesiumbasierende Legierung nach Anspruch 1 oder 2, bei der die mikrokristalline Phase einer intermetallischen Verbindung von zumindest Mg7Zn3 oder Al2Mg3 gleichmäßig und fein in einer Mg-Matrix einer hexagonal dichtgepackten Struktur dispergiert ist.
  4. Magnesiumbasierende Legierung nach Anspruch 1 oder 2, erhalten durch schnelle Verfestigung der Schmelze der Legierung bei einer Abkühlrate zwischen 102 bis 106 K/s.
EP92121691A 1991-12-26 1992-12-21 Hochfeste Legierungen auf Magnesiumbasis Expired - Lifetime EP0548875B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP344738/91 1991-12-26
JP03344738A JP3110116B2 (ja) 1991-12-26 1991-12-26 高強度マグネシウム基合金

Publications (2)

Publication Number Publication Date
EP0548875A1 EP0548875A1 (de) 1993-06-30
EP0548875B1 true EP0548875B1 (de) 1997-11-05

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Family Applications (1)

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EP92121691A Expired - Lifetime EP0548875B1 (de) 1991-12-26 1992-12-21 Hochfeste Legierungen auf Magnesiumbasis

Country Status (3)

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EP (1) EP0548875B1 (de)
JP (1) JP3110116B2 (de)
DE (1) DE69223026T2 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5540415B2 (ja) * 2008-06-03 2014-07-02 独立行政法人物質・材料研究機構 Ｍｇ基合金
KR20110104056A (ko) * 2009-01-19 2011-09-21 도쿠리츠교세이호징 붓시쯔 자이료 겐큐키코 Ｍｇ기 합금
AT521500B1 (de) * 2018-12-18 2020-02-15 Lkr Leichtmetallkompetenzzentrum Ranshofen Gmbh Verfahren zur Erhöhung einer Korrosionsbeständigkeit eines mit einer Magnesiumbasislegierung gebildeten Bauteiles gegen galvanische Korrosion sowie damit erhältliches korrosionsbeständiges Bauteil
CN112501467A (zh) * 2020-11-25 2021-03-16 安徽军明机械制造有限公司 一种耐热镁铝锌合金铸件的制备方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675157A (en) * 1984-06-07 1987-06-23 Allied Corporation High strength rapidly solidified magnesium base metal alloys
JPH0499244A (ja) * 1990-08-09 1992-03-31 Yoshida Kogyo Kk <Ykk> 高力マグネシウム基合金

Also Published As

Publication number Publication date
JPH05171330A (ja) 1993-07-09
EP0548875A1 (de) 1993-06-30
JP3110116B2 (ja) 2000-11-20
DE69223026T2 (de) 1998-05-20
DE69223026D1 (de) 1997-12-11

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