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EP1645647B1 - Cold age hardenable Al-alloy and process of the manufacture of a cast part - Google Patents

Cold age hardenable Al-alloy and process of the manufacture of a cast part Download PDF

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Publication number
EP1645647B1
EP1645647B1 EP05019300A EP05019300A EP1645647B1 EP 1645647 B1 EP1645647 B1 EP 1645647B1 EP 05019300 A EP05019300 A EP 05019300A EP 05019300 A EP05019300 A EP 05019300A EP 1645647 B1 EP1645647 B1 EP 1645647B1
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EP
European Patent Office
Prior art keywords
weight
percent
alloy
aluminium
primary
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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EP05019300A
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German (de)
French (fr)
Other versions
EP1645647B8 (en
EP1645647B2 (en
EP1645647A1 (en
Inventor
Jana Dipl.-Ing. Borchmann
Ursula Dipl.-Ing. Carlson
Ina Dipl.-Ing. Diederichs-Mittler
Andreas Dr. Ing. Kleine
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Trimet Aluminium SE
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Trimet Aluminium SE
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Priority to PL05019300T priority Critical patent/PL1645647T5/en
Publication of EP1645647A1 publication Critical patent/EP1645647A1/en
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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
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04—Modified aluminium-silicon alloys
    • 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
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon

Definitions

  • the invention relates to a cold-hardening cast aluminum alloy, which was melted on the basis of metallurgical aluminum Al 99.9 and at high tensile strength and yield strength still has an elongation of well over 1%, and a method for producing an aluminum casting.
  • the alloy 226A (VDS list) is known as a standardized casting alloy of the type G-AlSi8Cu3.
  • the chemical composition of this alloy is given in weight percent (Gw%) as follows: silicon 7.5-9.5 Gw%, iron max 0.8 Gw%, copper 2-3.5 Gw%, manganese 0.15-0 , 65% by weight, magnesium 0.05-0.55% by weight, nickel max 0.35% by weight, zinc max 1.2% by weight, titanium max 0.25% by weight, lead max 0.25% by weight, chromium max 0.15% by weight, balance aluminum and other admixtures 0.05% (individually) and 0.25% by weight (total).
  • a cold-hardening cast aluminum alloy and a method for producing an aluminum casting with high tensile strength and yield strength with simultaneously improved ductility should be specified.
  • the alloy should be easy to cast and suitable for the production of thermally highly stressable castings.
  • the castings should also be well weldable by conventional means.
  • sample thickness a 3mm
  • sample width b 8mm
  • head width B 12mm
  • head height h 15mm
  • initial length L0 30mm
  • Trial length Lc 33mm
  • total length Lt 80mm.
  • microstructures were compared. It was found that only small amounts of Mg 2 Si phases were formed in the alloy according to the invention. The recrystallization temperature was likewise markedly increased in the case of the alloy according to the invention. Furthermore, the number of beta-Al-Fe-Si needles was reduced by about 80%, which suggests a significantly improved ductility of the alloy according to the invention.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Laminated Bodies (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Continuous Casting (AREA)
  • Conductive Materials (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Forging (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Mold Materials And Core Materials (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

Cold hardening Al alloy based on primary metal/foundry Al of purity 99.9% or melted (sic) to give a primary alloy of higher purity, higher tensile strength and extension limit with an elongation greater than 1% contains (wt.%):Si (6-11), Cu (2.0-4.0), Mn (0.65-1.0), Zn (0.5-3.5), Sr (0.01-0.03), Mn 0.55 maximum, and Fe and Ti each 0.2 maximum. An independent claim is included for a method of preparing an Al casting part from the above composition.

Description

Die Erfindung betrifft eine kaltaushärtende Aluminiumgusslegierung, die auf Basis von Hüttenaluminium Al 99,9 erschmolzen wurde und bei hoher Zugfestigkeit und Streckgrenze noch eine Dehnung von deutlich über 1 % aufweist, sowie ein Verfahren zur Herstellung eines Aluminiumgussteils.The invention relates to a cold-hardening cast aluminum alloy, which was melted on the basis of metallurgical aluminum Al 99.9 and at high tensile strength and yield strength still has an elongation of well over 1%, and a method for producing an aluminum casting.

Stand der TechnikState of the art

Aus dem Werkstoff-Datenblatt ENAC-46200 ist als genormte Gusslegierung vom Typ G-AlSi8Cu3 die Legierung 226A (VDS Liste) bekannt. Die chemische Zusammensetzung dieser Legierung wird in Gewichtsprozent (Gw%) wie folgt angegeben: Silicium 7,5 - 9,5 Gw%, Eisen max 0,8 Gw%, Kupfer 2 - 3,5 Gw%, Mangan 0,15 - 0,65 Gw%, Magnesium 0,05 - 0,55 Gw%, Nickel max 0,35 Gw%, Zink max 1,2 Gw%, Titan max 0,25 Gw%, Blei max 0,25 Gw%, Chrom max 0,15 Gw%, Rest Aluminium sowie andere Beimengungen 0,05% (einzeln) und 0,25Gw% (insgesamt).From the material data sheet ENAC-46200 the alloy 226A (VDS list) is known as a standardized casting alloy of the type G-AlSi8Cu3. The chemical composition of this alloy is given in weight percent (Gw%) as follows: silicon 7.5-9.5 Gw%, iron max 0.8 Gw%, copper 2-3.5 Gw%, manganese 0.15-0 , 65% by weight, magnesium 0.05-0.55% by weight, nickel max 0.35% by weight, zinc max 1.2% by weight, titanium max 0.25% by weight, lead max 0.25% by weight, chromium max 0.15% by weight, balance aluminum and other admixtures 0.05% (individually) and 0.25% by weight (total).

Aus M. Schaefer und R.A Fournelle, "Effekt of strontium modification on near-threshold fatigue crack growth in an Al-Si-Cu die cast alloy", Metallurgical and Materials Transactions 27A, 05/1996, 1295-1301 , sind Al-Si-Cu-Fe-Zn-Mn-Legierungen mit Zusatz von Sr bekannt.Out M. Schaefer and RA Fournelle, "Effect of strontium modification on near-threshold fatigue crack growth in Al-Si-Cu cast alloy", Metallurgical and Materials Transactions 27A, 05/1996, 1295-1301 , Al-Si-Cu-Fe-Zn-Mn alloys with addition of Sr are known.

Aufgabenstellung Task

Ausgehend davon soll eine kaltaushärtende Aluminiumgusslegierung sowie ein Verfahren zur Herstellung eines Aluminiumgußteils mit hoher Zugfestigkeit und Streckgrenze bei gleichzeitig verbesserter Duktilität angegeben werden. Die Legierung soll gut vergießbar und zur Herstellung thermisch hoch beanspruchbarer Gussteile geeignet sein. Die Gussteile sollen auch mit herkömmlichen Mitteln gut schweißbar sein.Based on this, a cold-hardening cast aluminum alloy and a method for producing an aluminum casting with high tensile strength and yield strength with simultaneously improved ductility should be specified. The alloy should be easy to cast and suitable for the production of thermally highly stressable castings. The castings should also be well weldable by conventional means.

Zur Lösung des ersten Teils dieser Aufgabe wird eine neue AlSi9Cu3 mit zusätzlichen Gehalten an Mangan, Zink, Strontium und Obergrenzen für Magnesium, Eisen und Titan gemäß kennzeichnendem Teil von Patentanspruch 1 angegeben. Das neue Verfahren ist durch die im Patentanspruch 2 definierten Maßnahmen gekennzeichnet.To solve the first part of this problem, a new AlSi9Cu3 with additional levels of manganese, zinc, strontium and upper limits for magnesium, iron and titanium according to the characterizing part of claim 1 is given. The new method is characterized by the measures defined in claim 2.

BeispieleExamples

Im folgenden wird die Erfindung mit einer Standartlegierung verglichen. Dabei wurden die Werte von Zugfestigkeit, Dehngrenze und Dehnung an einem im Schwerkraftkokillenguss gegossenen Probestab gemessen, der auf folgende Abmessungen abgedreht wurde: Probendicke a= 3mm, Probenbreite b= 8mm, Kopfbreite B= 12mm, Kopfhöhe h= 15mm, Anfangslänge L0= 30mm, Versuchslänge Lc= 33mm und Gesamtlänge Lt= 80mm.In the following the invention will be compared with a standard alloy. The values of tensile strength, yield strength and elongation were measured on a sample cast in the gravity die casting, which was turned to the following dimensions: sample thickness a = 3mm, sample width b = 8mm, head width B = 12mm, head height h = 15mm, initial length L0 = 30mm, Trial length Lc = 33mm and total length Lt = 80mm.

1. Beispiel nach dem Stand der Technik1st example according to the prior art

Als Vergleichslegierung wird eine 226A-Gusslegierung mit folgender Zusammensetzung verwendet:

  • Si 8%, Fe 0,6%, Cu 3,0%, Mn 0,3%, Ni 0,2%, Zn 1,0%, Ti 0,2%, Pb 0,1%, Sn 0,1%, Mg 0,45 andere Beimengungen: einzeln 0,05, insgesamt 0,25%, Rest Aluminium.
The reference alloy used is a 226A casting alloy having the following composition:
  • Si 8%, Fe 0.6%, Cu 3.0%, Mn 0.3%, Ni 0.2%, Zn 1.0%, Ti 0.2%, Pb 0.1%, Sn 0.1 %, Mg 0.45 other admixtures: individually 0.05, total 0.25%, balance aluminum.

Die Gusslegierung G-AlSi8Cu3 (Werkstoff Nr. 3.2162.05) weist im Gusszustand folgende Werkstoffeigenschaften auf:

  • Streckgrenze Rp0,2 = 100 MPa
  • Zugfestigkeit Rm = 170 MPa
  • Dehnung A50mm = 1%
Cast alloy G-AlSi8Cu3 (material no. 3.2162.05) has the following material properties when cast:
  • Yield strength R p0.2 = 100 MPa
  • Tensile strength R m = 170 MPa
  • Elongation A 50mm = 1%

Vergleich der VerarbeitungseigenschaftenComparison of processing properties

Der Vergleich zwischen der Legierung 226A nach dem Stand der Technik und der erfindungsgemäßen Legierung zeigt die überlegenen Eigenschaften der erfindungsgemäßen Legierung, da die Werte für
Streckgrenze Rp0,2 ≥ 170MPa
Zugfestigkeit Rm ≥ 230 MPa bei gleichzeitig hoher
Dehnung A50mm > 1.5% gemessen wurden.The comparison between the prior art alloy 226A and the alloy of the present invention demonstrates the superior properties of the alloy of the present invention as the values for
Yield strength R p0.2 ≥ 170MPa
Tensile strength Rm ≥ 230 MPa with simultaneously high
Elongation A 50mm > 1.5% were measured.

Außerdem wurden die Gefügestrukturen verglichen. Dabei zeigte sich, dass bei der erfindungsgemäßen Legierung nur geringe Gehalte an Mg2Si-Phasen gebildet wurden. Die Rekristallisationstemperatur war bei der erfindungsgemäßen Legierung ebenfalls deutlich erhöht. Ferner war die Anzahl der Beta-Al-Fe-Si-Nadeln um ca. 80% verringert, was auf eine deutlich verbesserte Duktilität der erfindungsgemäßen Legierung schließen lässt.In addition, the microstructures were compared. It was found that only small amounts of Mg 2 Si phases were formed in the alloy according to the invention. The recrystallization temperature was likewise markedly increased in the case of the alloy according to the invention. Furthermore, the number of beta-Al-Fe-Si needles was reduced by about 80%, which suggests a significantly improved ductility of the alloy according to the invention.

Weitere Versuche zur Interpretation der GehaltsgrenzenFurther attempts to interpret the salary limits

Durch Variation der im Anspruch 1 angegebenen Gusslegierung hinsichtlich der Legierungsgrenzen wurden folgende Ergebnisse festgehalten:

1.
Magnesium: bei Gehalten von über 0,55 % wird während des Vergießens der erfindungsgemäß zusammengesetzte Basislegierung die Oxidationsneigung gefördert. Außerdem konnte bei derartig hohen Mg-Gehalten keine weitere Festigkeitssteigerung festgestellt werden, da sich Mg 2Si-Phasen bildeten.
2.
Eisen: bei Gehalten über 0,2 % wird bei allen nach Anspruch 8 vergossenen Legierungen die Dehnung deutlich herabgesetzt.
3.
Titan: Oberhalb von 0,2 % wurde keine Verbesserung des Gefüges eines nach Anspruch 1 ausgebildeten Gussteils im Hinblick auf die Rekristallisationstemperatur festgestellt.
4.
Indium und Cadmium verkürzen die Kaltauslagerungszeit der erfindungsgemäßen Legierung.
5.
Beryllium vermindert bei Magnesiumgehalten von über 0,4 bis 0,55 Gw% die Oxidationsneigung, die wiederum einen ungünstigen Einfluss auf die Dehnung hat.
6.
Cer erhöht in Aluminiumgusslegierungen der Zusammensetzung nach Anspruch 1 - 4 die Fließfähigkeit und mindert bis zu Gehalten von 0,4% die Klebneigung.
7.
Zink verbessert bis zu einem Gehalt von 3,5 % bei einer nach Anspruch 1 zusammengesetzten Legierung die Formstabilität des Gussteils, bei Gehalten von mehr als 3,5% wurde keine weitere Steigerung der Formstabilität bzw. eine Verringerung der Klebeneigung festgestellt.
By varying the casting alloy specified in claim 1 with respect to the alloying limits, the following results were recorded:
1.
Magnesium: at levels of more than 0.55%, the tendency to oxidation is promoted during the casting of the base alloy according to the invention. In addition, at such high Mg contents, no further increase in strength could be observed, since Mg 2 Si phases formed.
Second
Iron: at levels above 0.2%, the elongation is significantly reduced in all alloys cast according to claim 8.
Third
Titanium: Above 0.2%, no improvement in the texture of a casting formed according to claim 1 was found in terms of the recrystallization temperature.
4th
Indium and cadmium shorten the cold aging time of the alloy according to the invention.
5th
Beryllium reduces the tendency to oxidation at magnesium contents of more than 0.4 to 0.55% by weight, which in turn has an unfavorable influence on the elongation.
6th
Cerium increases flowability in cast aluminum alloys of the composition according to claims 1-4 and reduces stickiness up to levels of 0.4%.
7th
Zinc improves the dimensional stability of the casting up to a content of 3.5% in an alloy composed according to claim 1, at levels of more than 3.5% no further increase in the dimensional stability or a reduction in the tendency to adhere was found.

Somit lässt sich die technische Überlegenheit der ausgewählten Parameter für die erfindungsgemäße Aluminiumgusslegierung als Ergebnis einer synergistischen Wirkung der jeweils beteiligten Legierungselemente begründen.Thus, the technical superiority of the selected parameters for the aluminum casting alloy according to the invention can be justified as the result of a synergistic effect of the respective alloying elements involved.

Claims (3)

  1. A strain hardening cast aluminium alloy which was molten on the basis of primary metal/primary aluminium of a purity of 99.9 or a higher degree of purity as a primary alloy and which, at a high tensile strength and yield point, still comprises an elongation in excess of 1%,
    characterised by the following alloy contents in percentages by weight:
    silicon 6 - 11 percent by weight
    copper 2.0 - 4.0 percent by weight
    manganese 0.65 - 1.0 percent by weight
    zinc 0.5 - 3.5 percent by weight
    strontium 0.01 - 0.04 percent by weight
    manganese max. 0.55 percent by weight
    iron max. 0.2 percent by weight
    titanium max. 0.2 percent by weight
    and, optionally, one or more elements of the following group:
    - silver 0.01 - 0.80 percent by weight
    - samarium 0.01 - 1.0 percent by weight
    - nickel 0.01 - 0.40 per cent by weight
    and/or, optionally, up to 0.4 percent by weight of cerium
    and/or, optionally, one or several elements of the following group:
    - cadmium 0.01 - 0.30 percent by weight
    - indium 0.01 - 0.20 percent by weight
    and/or
    beryllium up to 0.001 percent by weight,
    the remainder being aluminium and production-related impurities.
  2. A process of producing a strain hardening aluminium casting which, at a high tensile strength and yield point, comprises an elongation clearly in excess of 1 %,
    characterised in
    that an AlSiCu cast alloy according to claim 1 is molten on the basis of primary metal/primary aluminium of a purity of Al 99.9 or purer and that the casting process is followed directly by a strain hardening period of 7 - 9 days.
  3. A process according to claim 2,
    characterised in
    that for improving the strength values while maintaining a uniformly high elongation value in excess of 1.5 %, the strain hardening operation is followed by a quench-age hardening operation at 160 to 240 °C.
EP05019300.2A 2004-10-08 2005-09-06 Cold age hardenable Al-alloy and process of the manufacture of a cast part Expired - Lifetime EP1645647B8 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05019300T PL1645647T5 (en) 2004-10-08 2005-09-06 Cold age hardenable Al-alloy and process of the manufacture of a cast part

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004049074A DE102004049074A1 (en) 2004-10-08 2004-10-08 Cold curing aluminum casting alloy and method of making an aluminum casting

Publications (4)

Publication Number Publication Date
EP1645647A1 EP1645647A1 (en) 2006-04-12
EP1645647B1 true EP1645647B1 (en) 2007-12-05
EP1645647B2 EP1645647B2 (en) 2013-06-12
EP1645647B8 EP1645647B8 (en) 2013-07-24

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EP (1) EP1645647B8 (en)
AT (1) ATE380260T1 (en)
DE (2) DE102004049074A1 (en)
NO (1) NO346421B1 (en)
PL (1) PL1645647T5 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9446447B2 (en) 2010-02-11 2016-09-20 Ksm Castings Group Gmbh Method and device for producing motor vehicle chassis parts
EP4079880A4 (en) * 2019-12-20 2023-01-25 BYD Auto Industry Company Limited ALUMINUM ALLOY AND RELATED APPLICATION

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1997924B1 (en) 2007-05-24 2009-12-23 ALUMINIUM RHEINFELDEN GmbH High-temperature aluminium alloy
US11471984B2 (en) 2018-06-28 2022-10-18 Scandium International Mining Corporation Control of recrystallization in cold-rolled AlMn(Mg)ScZr sheets for brazing applications
CN108866460B (en) * 2018-07-20 2020-08-07 合肥工业大学 Aging process of Al-Si-Mg-Zr-Ti-Sc alloy
CN117646138A (en) * 2024-01-30 2024-03-05 鸿劲新材料研究(南通)有限公司 Explosion-proof aluminum alloy material and preparation method thereof
CN120551638B (en) * 2025-08-04 2025-10-24 烟台市睿丰新材料科技有限公司 High-temperature-resistant composite aluminum alloy for wave soldering jig and preparation method thereof

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DE1255928B (en) * 1966-01-13 1967-12-07 Metallgesellschaft Ag Process to achieve a long-lasting refining effect in aluminum-silicon alloys
US3619181A (en) * 1968-10-29 1971-11-09 Aluminum Co Of America Aluminum scandium alloy
DE2326193C3 (en) * 1973-05-23 1981-06-04 Vereinigte Aluminium-Werke Ag, 5300 Bonn Solder for flux-free soldering of aluminum materials
JPS5419409A (en) † 1977-07-14 1979-02-14 Showa Denko Kk High strength aluminium alloy for die casting
US4648918A (en) * 1984-03-02 1987-03-10 Kabushiki Kaisha Kobe Seiko Sho Abrasion resistant aluminum alloy
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9446447B2 (en) 2010-02-11 2016-09-20 Ksm Castings Group Gmbh Method and device for producing motor vehicle chassis parts
US10041161B2 (en) 2010-02-11 2018-08-07 Trimet Aluminium Se Method and device for producing motor vehicle chassis parts
EP4079880A4 (en) * 2019-12-20 2023-01-25 BYD Auto Industry Company Limited ALUMINUM ALLOY AND RELATED APPLICATION
US12448668B2 (en) 2019-12-20 2025-10-21 Byd Auto Industry Company Limited Aluminum alloy and application thereof

Also Published As

Publication number Publication date
EP1645647B8 (en) 2013-07-24
PL1645647T5 (en) 2014-03-31
PL1645647T3 (en) 2008-07-31
DE102004049074A1 (en) 2006-04-13
NO20054576L (en) 2006-04-10
ATE380260T1 (en) 2007-12-15
DE502005002140D1 (en) 2008-01-17
NO346421B1 (en) 2022-07-25
EP1645647B2 (en) 2013-06-12
NO20054576D0 (en) 2005-10-05
EP1645647A1 (en) 2006-04-12

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