EP2706127B1 - Komplexes Magnesiumlegierungselement und Herstellungsverfahren dafür - Google Patents

Komplexes Magnesiumlegierungselement und Herstellungsverfahren dafür Download PDF

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Publication number
EP2706127B1
EP2706127B1 EP13183125.7A EP13183125A EP2706127B1 EP 2706127 B1 EP2706127 B1 EP 2706127B1 EP 13183125 A EP13183125 A EP 13183125A EP 2706127 B1 EP2706127 B1 EP 2706127B1
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EP
European Patent Office
Prior art keywords
alloy
magnesium alloy
cast
alloy composition
complex
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.)
Not-in-force
Application number
EP13183125.7A
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English (en)
French (fr)
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EP2706127A1 (de
Inventor
Hiroyuki Kawabata
Hajime Kato
Yasushi Iwata
Isamu Ueda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Central R&D Labs Inc
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Toyota Central R&D Labs Inc
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Publication of EP2706127A1 publication Critical patent/EP2706127A1/de
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    • 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
    • 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
    • B22D21/002—Castings of light metals
    • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • 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

Definitions

  • the present invention relates to a complex magnesium alloy member configured such that magnesium alloys having different alloy compositions are merged into one another, and a method for producing the same.
  • Magnesium (Mg) is the most lightweight metal among practical metals and has a high specific strength, and resources of magnesium are rich. In recent years where weight saving and reduction of environmental burdens etc. are strongly needed, magnesium is a promising metal material, and magnesium alloys have been being used for various products.
  • Magnesium alloys have different characteristics depending on their alloy compositions, so that an appropriate alloy composition for each product has been selected.
  • the conventional magnesium alloy product may have been such that the whole is formed of the same alloy composition, or may have been a cast member (complex member) in which the magnesium alloy is cast with a heterogeneous member (cast-in material) such as formed of steel material to a site where a certain strength and/or stiffness are required.
  • a heterogeneous member such as formed of steel material to a site where a certain strength and/or stiffness are required.
  • EP 0 799 901 A1 discloses a heat-resistant magnesium alloy member.
  • the conventional cast member as disclosed in Patent Literature 1 may readily cause delamination or other troubles at the bonded interface between the cast-in material (steel material) and the cast material (magnesium alloy), and cannot be used for a product that requires hermetic properties, such as liquid-tightness and gas-tightness.
  • production cost of the cast member becomes high because the cast-in material may have to be preliminarily formed thereon with retaining grooves or other appropriate means by machining process.
  • the present invention has been created in view of such circumstances, and objects of the present invention include providing a complex magnesium alloy member in which, different from the conventional cast member and other members, magnesium alloys having different alloy compositions are integrated with one another, and also providing a method for producing the same.
  • a complex member can be obtained in which an appropriate magnesium alloy can be located at an appropriate location and which can enhance the mechanical characteristics and other properties as well as reduce the raw material cost, and further improve the productivity, such as casting ability.
  • the complex member according to the present invention may be such that the whole is formed of magnesium alloys, thereby not impairing the lightweight property, and necessary treatment such as heat treatment and machining process can be conducted like in the prior art, and recyclability etc. may be sufficient when discarded.
  • the boundary portion according to the present invention between the abutting first portion and second portion is a portion in which the first magnesium alloy that constitutes the first portion and the second magnesium alloy that constitutes the second portion are merged into each other, and thus different from a bonded portion such as caused by pressure bonding and adhesion.
  • the boundary portion comprises the intermediate magnesium alloy having the intermediate alloy composition between the first magnesium alloy (first alloy composition) and the second magnesium alloy (second alloy composition).
  • This intermediate magnesium alloy is in general such that the alloy composition varies continuously or gradually along from the first magnesium alloy to the second magnesium alloy.
  • the boundary portion according to the present invention does not comprise a sharply-defined interface at which the alloy composition and the structure etc. rapidly vary.
  • the boundary portion is configured of a boundary region (the width may be about several to several tens micro meters) in which the alloy composition varies relatively gently between the abutting magnesium alloys.
  • a boundary region the width may be about several to several tens micro meters
  • the alloy composition varies relatively gently between the abutting magnesium alloys.
  • the complex member according to the present invention is configured such that magnesium alloys having different alloy compositions are continuously integrated as if they act as one magnesium alloy bulk. Therefore, unlike in the conventional cast member, troubles such as delamination and liquid-leakage may not occur at the boundary portion.
  • both sides of the boundary portion are provided with the same kind of metal (magnesium alloys), so that any intermetallic compound or the like (crystallized substance or precipitated substance), which is likely to be formed between dissimilar metals in general, may not be formed in the boundary portion, and the boundary portion can thus be prevented from being fracture origin.
  • the first portion and the second portion according to the present invention merge into each other in the boundary portion thereby to enhance the heat conductivity and the electrical conductivity etc. between the first portion and the second portion.
  • the form of the cast-in material, the shape of the cavity, the casting conditions and other factors in the production method of the present invention may not be limited. At least a part of the cast-in material may be heated before the pouring step thereby to adjust the form of the bonded portion (boundary portion) formed between the cast-in material and the cast material.
  • the complex magnesium alloy member obtained after the solidification step may additionally be subjected to at least one subsequent step, such as heat treatment or plastic working.
  • the first alloy composition is not limited, but may preferably comprise, when the whole thereof is assumed to be 100 mass% (referred simply to as "%"), Al: 5-18%, Ca: 1-12%, and the balance: Mg, modifying elements selected from one or more of Zn, Mn, rare-earth elements, Be, Sn, Si, Sr, Bi, and Zr, and inevitable impurities.
  • the magnesium alloy having this alloy composition may develop excellent heat resistance due to Ca even without using expensive rare elements and cause the liquidus temperature (TL1) to be relatively low.
  • the liquidus temperature may be 530 to 600 degrees C depending on the alloy composition.
  • the second alloy composition may preferably comprise, when the whole thereof is assumed to be 100%, Al: 2.5-15% and the balance: Mg, modifying elements selected from one or more of Zn, Mn, rare-earth elements, Be, Sn, Si, Sr, Bi, and Zr, and inevitable impurities.
  • the magnesium alloy having this alloy composition may have versatility and excellent casting ability and allow magnesium alloy products to be produced efficiently at low cost by die-casting etc.
  • the liquidus temperature (TL2) is relatively high, and may be 580 to 640 degrees C depending on the alloy composition.
  • Specific alloy composition of the intermediate magnesium alloy that constitutes the boundary portion is not limited if the intermediate magnesium alloy has the above intermediate alloy composition between the first alloy composition and the second alloy composition.
  • the intermediate alloy composition is not fixed in general, and may vary within a range having the upper and lower limits based on the first alloy composition and the second alloy composition.
  • the alloy composition as referred to herein is an alloy composition of a macro region that has a certain degree of expansion rather than being an alloy composition of a micro (local) region that constitutes the metallographic structure.
  • the alloy composition and the width of the boundary portion can be adjusted by the liquidus temperatures (TL1 and TL2) and/or production conditions for the complex member (such as the molten alloy temperature, the molten alloy holding time, and the solidification rate).
  • the complex member according to the present invention may be suitable as a member in which various sites require different characteristics. Examples of such a member include various cases and containers in which only the site to be connected with another member requires heat resistance and/or strength.
  • samples were prepared as a plurality of complex members each produced by casting, with a cast-in material comprising its respective alloy composition (first alloy composition), a cast material comprising an alloy composition (second alloy composition) different from the first alloy composition.
  • the cast-in material is a cylindrical solid piece (diameter: 20 mm, height: 10 mm) cut out from an ingot obtained by gravity casting using a boat-shaped steel mold.
  • commercially available alloy or pure metal was used as a raw material. The same applies to the cast material that will be described later.
  • Symbols shown in columns of alloy compositions in Table 1 comply with ASTM standard or JIS which represents each alloy composition.
  • the above cylindrical solid piece was set at the center area of a die-casting mold having a cavity with cylindrical shape (diameter: 50 mm, height: 30 mm) (locating step).
  • Each molten alloy for the cast material as shown in Table 1 was poured into the cavity at the molten alloy temperature shown in the table (pouring step). Thereafter, the mold was cooled to solidify the cast material, and a complex member was obtained to be cast therein with the cylindrical solid piece (solidification step).
  • This operation was conducted under die-casting conditions of the injection speed: 0.4 m/s and the injection pressure: 64 MPa.
  • Fig. 1A to Fig. 1C are photographs each showing the metallographic structure of the bonded portion between the cast-in material and the cast material obtained in such a manner. Note that the metallographic structure of Sample 2 was substantially the same form as that of Sample 1 ( Fig. 1A ).
  • Fig. 1C shows that, even in the case where the liquidus temperature of the cast-in material is lower than that of the cast material, if they have different main components (types of basis), then any bonded portion (boundary portion) as shown in Fig. 1A cannot be obtained. It has further been found that a boundary layer comprising an intermetallic compound (Al-Mg compound) based on those main components appears in the bonded portion between the cast-in material and the cast material. Such a boundary layer may cause deterioration in strength of the complex member.
  • Al-Mg compound an intermetallic compound

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Continuous Casting (AREA)
  • Forging (AREA)

Claims (5)

  1. Komplexes Magnesiumlegierungsbauteil, umfassend:
    einen ersten Abschnitt, der eine erste Magnesiumlegierung umfasst, die eine erste Legierungszusammensetzung aufweist,
    einen zweiten Abschnitt, der eine zweite Magnesiumlegierung umfasst, die eine zweite Legierungszusammensetzung aufweist, die von der ersten Legierungszusammensetzung verschieden ist, wobei die Temperaturdifferenz (|TL1 - TL2|) zwischen einer Liquidustemperatur (TL1) der ersten Magnesiumlegierung und einer Liquidustemperatur (TL2) der zweiten Magnesiumlegierung 10 Grad Celsius oder mehr beträgt, und
    einen Grenzabschnitt, der eine Magnesium-Zwischenlegierung mit einer Zwischenlegierungszusammensetzung umfasst, die zwischen der ersten Legierungszusammensetzung und der zweiten Legierungszusammensetzung liegt, wobei der Grenzabschnitt in den ersten und den zweiten Abschnitt übergeht und an den ersten Abschnitt und den zweiten Abschnitt angrenzt, so dass eine Grenze zwischen dem ersten Abschnitt und dem zweiten Abschnitt ausgebildet ist.
  2. Komplexes Magnesiumlegierungsbauteil nach Anspruch 1, bei dem
    die erste Legierungszusammensetzung, wenn deren Gesamtheit als 100 Massen-% (einfach als "%" bezeichnet) angesetzt wird, Al: 5 bis 18 %, Ca: 1 bis 12 % und als Rest Mg, modifizierende Elemente, die aus einem oder mehreren von Zn, Mn, Seltenerdelementen, Be, Sn, Si, Sr, Bi und Zr ausgewählt sind, und unvermeidbare Verunreinigungen umfasst, und
    die zweite Legierungszusammensetzung, wenn deren Gesamtheit als 100 Massen-% angesetzt wird, Al: 2,5 bis 15 % und als Rest Mg, modifizierende Elemente, die aus einem oder mehreren von Zn, Mn, Seltenerdelementen, Be, Sn, Si, Sr, Bi und Zr ausgewählt sind, und unvermeidbare Verunreinigungen umfasst.
  3. Verfahren zur Herstellung eines komplexen Magnesiumlegierungsbauteils, wobei das Verfahren umfasst:
    einen Anordnungsschritt, bei dem ein einzugießendes Material in einem Hohlraum einer Form angeordnet wird, wobei das einzugießende Material eine erste Magnesiumlegierung umfasst, die eine erste Legierungszusammensetzung aufweist,
    einen Gießschritt, bei dem eine geschmolzene Legierung in den Hohlraum gegossen wird, wobei die geschmolzene Legierung eine zweite Magnesiumlegierung umfasst, die eine zweite Legierungszusammensetzung aufweist, wobei die zweite Magnesiumlegierung eine Liquidustemperatur aufweist, die höher ist als diejenige der ersten Magnesiumlegierung, wobei die erste Legierungszusammensetzung und die zweite Legierungszusammensetzung Zusammensetzungen sind, so dass die Temperaturdifferenz (|TL1 - TL2|) zwischen einer Liquidustemperatur (TL1) der ersten Magnesiumlegierung und einer Liquidustemperatur (TL2) der zweiten Magnesiumlegierung 10 Grad Celsius oder mehr beträgt, und
    einen Erstarrungsschritt, bei dem die geschmolzene Legierung abgekühlt wird und erstarrt, so dass ein komplexes Magnesiumlegierungsbauteil erhalten wird, in dem ein gegossenes Material, das die zweite Magnesiumlegierung umfasst, mit dem einzugießenden Material vergossen ist und wobei das komplexe Magnesiumlegierungsbauteil einen Grenzabschnitt umfasst, der eine Magnesium-Zwischenlegierung mit einer Zwischenlegierungszusammensetzung umfasst, die zwischen der ersten Legierungszusammensetzung und der zweiten Legierungszusammensetzung liegt, wobei der Grenzabschnitt in den ersten und den zweiten Abschnitt übergeht und an den ersten Abschnitt und den zweiten Abschnitt angrenzt, so dass eine Grenze zwischen dem ersten Abschnitt und dem zweiten Abschnitt ausgebildet ist.
  4. Verfahren zur Herstellung eines komplexen Magnesiumlegierungsbauteils nach Anspruch 3, wobei mindestens ein Teil des einzugießenden Materials vor dem Gießschritt erwärmt wird.
  5. Verfahren zur Herstellung eines komplexen Magnesiumlegierungsbauteils nach Anspruch 3 oder 4, wobei in dem Verfahren die komplexe Magnesiumlegierung nach dem Erstarrungsschritt ferner mindestens einem von einer Wärmebehandlung oder einer plastischen Bearbeitung unterzogen wird.
EP13183125.7A 2012-09-05 2013-09-05 Komplexes Magnesiumlegierungselement und Herstellungsverfahren dafür Not-in-force EP2706127B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2012194953A JP5700005B2 (ja) 2012-09-05 2012-09-05 複合マグネシウム合金部材およびその製造方法

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EP2706127A1 EP2706127A1 (de) 2014-03-12
EP2706127B1 true EP2706127B1 (de) 2014-12-24

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WO2021157748A1 (ja) * 2020-02-07 2021-08-12 国立大学法人 熊本大学 マグネシウム合金及びその製造方法
CN113999999A (zh) * 2021-10-29 2022-02-01 华中科技大学 稀土增强固液复合铸造镁/铝双金属的制备方法及产品

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JPS60257947A (ja) * 1984-06-04 1985-12-19 Kawasaki Steel Corp クラツド鋳塊の製造方法
JPH08300137A (ja) * 1995-05-01 1996-11-19 Suzuki Motor Corp 複合部材の製造方法
JPH09183379A (ja) 1995-12-29 1997-07-15 Tokyo Seat Kk ステアリングホイールダイカスト芯金のインサートボス
JP3415987B2 (ja) * 1996-04-04 2003-06-09 マツダ株式会社 耐熱マグネシウム合金成形部材の成形方法
JP3663867B2 (ja) * 1997-12-24 2005-06-22 いすゞ自動車株式会社 鋳ぐるみ鋳造方法
JP3233095B2 (ja) * 1998-03-25 2001-11-26 日本軽金属株式会社 アルミ鋳ぐるみ製品の製造方法
JP2001205419A (ja) * 2000-01-24 2001-07-31 Matsushita Electric Ind Co Ltd マグネシウム合金の射出成形方法およびそれによって得られた成形品
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JP3861720B2 (ja) * 2002-03-12 2006-12-20 Ｔｋｊ株式会社 マグネシウム合金の成形方法
JP2004223532A (ja) * 2003-01-21 2004-08-12 Aisin Takaoka Ltd 複合鋳造品及びその製造方法
JP4575645B2 (ja) * 2003-01-31 2010-11-04 株式会社豊田自動織機 鋳造用耐熱マグネシウム合金および耐熱マグネシウム合金鋳物
JP2005177834A (ja) * 2003-12-22 2005-07-07 Toyota Industries Corp ダイカスト方法
JP2009532208A (ja) * 2006-03-30 2009-09-10 ゼットエフ グループ ノース アメリカン オペレイションズ インコーポレイテッド 多層複合材物品の製造方法
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JP5700005B2 (ja) 2015-04-15
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