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WO2004005563A1 - As-magnesium pressure die cast alloy and method for producing a subassembly part from an as-magnesium pressure die cast alloy of this type - Google Patents

As-magnesium pressure die cast alloy and method for producing a subassembly part from an as-magnesium pressure die cast alloy of this type Download PDF

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Publication number
WO2004005563A1
WO2004005563A1 PCT/EP2003/006727 EP0306727W WO2004005563A1 WO 2004005563 A1 WO2004005563 A1 WO 2004005563A1 EP 0306727 W EP0306727 W EP 0306727W WO 2004005563 A1 WO2004005563 A1 WO 2004005563A1
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die
content
casting
alloy according
alloy
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German (de)
French (fr)
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Andreas Barth
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Mercedes Benz Group AG
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DaimlerChrysler AG
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Priority to US10/520,358 priority Critical patent/US20050238524A1/en
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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
    • C22C23/02—Alloys based on magnesium with aluminium as the next major constituent

Definitions

  • the invention relates to an AS die casting alloy, in particular for thermally stressed unit parts in the motor vehicle sector.
  • magnesium alloys are used for thermally highly stressed unit parts, they must have a low aluminum content in order to be resistant to creep, so that the connecting screws are not loosened in hot unit operation.
  • MgAl2Sil die-casting alloys which are also referred to as AS21 alloy
  • MgAl4Sil alloys which are also referred to as AS41 alloy
  • AS21 alloys With a falling aluminum content in the magnesium alloy, less creep-prone Mg ⁇ 7 Al ⁇ 2 grain boundary precipitates form at a thermal load above 120 ° C., so that AS21 alloys are more creep-resistant than AS41 alloys.
  • an AS21 alloy is less strong, more susceptible to corrosion and, above all, difficult to cast. Casting errors, such as gluing to the mold and hot cracks, do not allow safe series production of large unit parts.
  • an AS41 alloy does not have these disadvantages. However, it is more susceptible to creep and less ductile due to the higher content of Mg ⁇ 7 Al ⁇ 2 grain size separations. A lower toughness deteriorates the dynamic strength of the alloy in the case of a notch effect, e.g. caused by stone chips, corrosion, etc. When subjected to thermal stress, the ductility drops further as a result of the precipitation of additional, brittle Mg 17 Al ⁇ 2 phases at the grain boundaries. This reduces the dynamic load capacity of components made of AS41 alloys while driving. Such alloys are known, for example, from WO-A-01 02 614.
  • the invention is therefore based on the object of providing an AS alloy which is thermally stable with regard to creep and ductility and at the same time can be cast satisfactorily.
  • the aluminum content lies between the standardized alloys AS21 and AS41.
  • the aluminum content of the AS die-cast alloy according to the invention does not reach the value that an AS41 alloy has, there is no danger that the die-cast part will become brittle.
  • the aluminum content is between 2.5% by weight and 4% by weight, in particular between 2.8% by weight and 3.5% by weight, preferably 3% by weight.
  • the castability, strength, corrosion resistance, creep resistance and ductility can be set within certain limits by the choice of the aluminum content.
  • the AS die casting alloy is a MgAl3Sil alloy (AS31).
  • AS31 MgAl3Sil alloy
  • This alloy has an aluminum content and in particular further alloy components that lie between the values of AS21 and AS41 alloys.
  • the AS die casting alloy according to the invention has an Mn content which is greater than 0/20% by weight.
  • the Cu content is ⁇ 100 ppm.
  • the Ni content is below 20 pp.
  • the Fe content is also ⁇ 50 ppm.
  • the Si content is between 0.7 and 1.5% by weight.
  • the Zn content is below 0.20% by weight.
  • the above-mentioned object is also achieved with a method for producing a thermally resilient unit part from the above-mentioned AS die-casting alloy in that it is quenched in water after the casting or after the die-casting mold has been opened.
  • the thermal stability of the structure is noticeably improved during long-term exposure at 150 ° C.
  • the roughly precipitated Mg 17 Al ⁇ 2 grain boundary precipitates act as nucleating agents for further Mg 7 Al 12 phases, so that after thermal aging the grain boundaries are completely covered or anchored with Mg i7 Al 2 phases are. This leads to total material embrittlement.
  • the water-quenched AS31 die casting according to the invention experiences only a slight loss in elongation at break after a thermal aging of 2000 hours at 150 ° C., although tensile strength and yield strength advantageously increase due to the elimination of further fine Mg 17 Al 2 phases. This results in an excellent dynamic strength behavior, even in the case of thermal stress at 150 ° C.
  • the water quenching also improves the creep resistance of the alloy according to the invention. As already mentioned, more aluminum is dissolved in the Mg matrix from the outset. This improves the creep resistance to such an extent that the dissolution behavior of aluminum screws corresponds to that of the known AS21 alloy despite the higher Al content of the alloy according to the invention.
  • the AS31 alloy according to the invention in particular a transmission housing made from it, has a minimum tensile strength of 180 MPa, a minimum yield strength of 110 MPa and the minimum elongation at break in the area of the cast gate is 6%.
  • the assembly part produced from the alloy according to the invention is preferably quenched in water within 60 s, in particular within 40 s, preferably within 30 s, after casting or after opening the die-casting mold. As mentioned above, this lowering of the temperature immediately after the casting process prevents coarse Mg ⁇ 7 Al 12 grain boundary phases from forming in excess.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

The invention relates to an AS pressure die cast alloy, in particular for use as thermally stressed subassembly parts in the motor vehicle industry, whose Al content lies between that of the AS21 and AS41 alloys. The invention also relates to a method for producing a subassembly part from an alloy of this type, in which said part is quenched in water after casting, or after the die casting mould has been opened.

Description

AS-MAGNESIUMDRUCKGUSSLEGIERUNG UND VERFAHREN 2UM HERSTELLEN EINES AGGREGATTEILS AUS EINER DERARTIGEN AS-MAGNESIUMDRUCKGUSSLEGIERUNGAS MAGNESIUM DIE CASTING ALLOY AND METHOD 2UM MANUFACTURE OF AN AGGREGATE PART FROM SUCH AS AS MAGNESIUM DIE CAST ALLOY

Die Erfindung betrifft eine AS-Druckgusslegierung, insbesondere für thermisch belastete Aggregatteile im Kraftfahrzeug- Bereich.The invention relates to an AS die casting alloy, in particular for thermally stressed unit parts in the motor vehicle sector.

Werden für thermisch hochbelastete Aggregatteile Magnesium- Legierungen verwendet, so müssen diese einen niedrigen Aluminium-Gehalt besitzen, um kriechbeständig zu sein, so dass im heißen Aggregatbetrieb kein Lösen der Verbindungsschrauben erfolgt. Als kriechbeständige Legierungen sind MgAl2Sil- Druckgusslegierungen, die auch als AS21-Legierung bezeichnet werden, und MgAl4Sil-Legierungen, die auch als AS41-Legierung bezeichnet werden, bekannt. Mit fallendem Aluminium-Gehalt in der Magnesium-Legierung bilden sich bei thermischer Belastung oberhalb von 120° C weniger kriechanf llige Mgι7Alι2-Korn- grenzenausscheidungen aus, so dass AS21-Legierungen kriechbeständiger sind als AS41-Legierungen. Wegen des geringeren A- luminium-Gehalts ist eine AS21-Legierung jedoch weniger fest, korrosionsanfälliger und vor Allem schlecht gießbar. Gießfehler, wie Kleben an der Gussform und Heißrisse ermöglichen keine sichere Serienproduktion von großen Aggregatteilen.If magnesium alloys are used for thermally highly stressed unit parts, they must have a low aluminum content in order to be resistant to creep, so that the connecting screws are not loosened in hot unit operation. As creep-resistant alloys, MgAl2Sil die-casting alloys, which are also referred to as AS21 alloy, and MgAl4Sil alloys, which are also referred to as AS41 alloy, are known. With a falling aluminum content in the magnesium alloy, less creep-prone Mgι 7 Alι 2 grain boundary precipitates form at a thermal load above 120 ° C., so that AS21 alloys are more creep-resistant than AS41 alloys. However, due to the lower aluminum content, an AS21 alloy is less strong, more susceptible to corrosion and, above all, difficult to cast. Casting errors, such as gluing to the mold and hot cracks, do not allow safe series production of large unit parts.

Diese Nachteile weist eine AS41-Legierung jedoch nicht auf. Sie ist aber wegen des höheren Gehalts an Mgι7Alι2-Korn- grenzenausscheidungen kriechanfälliger und weniger duktil ist. Eine geringere Zähigkeit verschlechtert die dynamische Festigkeit der Legierung im Fall von Kerbwirkung, die z.B. durch Steinschlag, Korrosion usw. hervorgerufen wird. Bei thermischer Belastung fällt die Duktilitat in Folge des Ausscheidens zusätzlicher, spröder Mg17Alχ2-Phasen an den Korngrenzen weiter ab. Somit verringert sich die dynamische Belastbarkeit von Bauteilen aus AS41 -Legierungen im Fahrbetrieb. Aus der WO-A-01 02 614 sind z.B. derartige Legierungen bekannt .However, an AS41 alloy does not have these disadvantages. However, it is more susceptible to creep and less ductile due to the higher content of Mgι 7 Alι 2 grain size separations. A lower toughness deteriorates the dynamic strength of the alloy in the case of a notch effect, e.g. caused by stone chips, corrosion, etc. When subjected to thermal stress, the ductility drops further as a result of the precipitation of additional, brittle Mg 17 Alχ 2 phases at the grain boundaries. This reduces the dynamic load capacity of components made of AS41 alloys while driving. Such alloys are known, for example, from WO-A-01 02 614.

Der Erfindung liegt daher die Aufgabe zugrunde, eine AS- Legierung bereitzustellen, die thermisch stabil bezüglich Kriechen und Duktilitat und gleichzeitig befriedigend gießbar ist .The invention is therefore based on the object of providing an AS alloy which is thermally stable with regard to creep and ductility and at the same time can be cast satisfactorily.

Diese Aufgabe wird mit einer AS-Druckgusslegierung der eingangs genannten Art erfindungsgemäß dadurch gelöst, dass deren Aluminium-Gehalt zwischen dem Aluminium-Gehalt der AS21- und der AS41-Legierungen liegt.This object is achieved according to the invention with an AS die-cast alloy of the type mentioned at the outset in that its aluminum content lies between the aluminum content of the AS21 and AS41 alloys.

Legierungstechnisch wurde erfindungsgemäß ein Kompromiss bezüglich Gießbarkeit, Festigkeit und Korrosionsbeständigkeit einerseits, was durch einen höheren Aluminium-Gehalt erzielt wird, und Kriechbeständigkeit und Duktilitat andererseits, was durch einen niedrigeren Aluminium-Gehalt erzielt wird, eingegangen. In der erfindungsgemäßen AS-Druckgusslegierung liegt der Aluminium-Gehalt zwischen den genormten Legierungen AS21 und AS41.In terms of alloy technology, according to the invention a compromise was made with regard to castability, strength and corrosion resistance on the one hand, which is achieved by a higher aluminum content, and creep resistance and ductility on the other hand, which is achieved by a lower aluminum content. In the AS die casting alloy according to the invention, the aluminum content lies between the standardized alloys AS21 and AS41.

Gießversuche an Getriebegehäuse zeigten, dass AS-Legierungen ab einem Aluminium-Gehalt von 2,5 Gew.-% sich gut vergießen lassen. Es wurde kein Verkleben der Gussteile in der Druckgussform festgestellt. Außerdem zeigten die Gussteile keine Heißrisse. Ferner führt der im Vergleich zu einer AS21- Legierung höhere Aluminium-Gehalt zu der gewünschten Festigkeitssteigerung. Da der Aluminium-Gehalt der erfindungsgemäßen AS-Druckgusslegierung nicht den Wert erreicht, den eine AS41-Legierung besitzt, besteht keine Gefahr, dass das Druckgussteil versprödet . Erfindungsgemäß liegt der Aluminium-Gehalt zwischen 2,5 Gew.- % und 4 Gew.-%, insbesondere zwischen 2,8 Gew.-% und 3,5 Gew.-%, bevorzugt bei 3 Gew.-%. Durch die Wahl des Aluminium- Gehalts können die Gießbarkeit, Festigkeit, Korrosionsbeständigkeit, Kriechbeständigkeit und Duktilitat in gewissen Grenzen eingestellt werden.Casting tests on gearbox housings showed that AS alloys with an aluminum content of 2.5% or more can be cast easily. No sticking of the cast parts in the die was found. In addition, the castings showed no hot cracks. Furthermore, the higher aluminum content compared to an AS21 alloy leads to the desired increase in strength. Since the aluminum content of the AS die-cast alloy according to the invention does not reach the value that an AS41 alloy has, there is no danger that the die-cast part will become brittle. According to the invention, the aluminum content is between 2.5% by weight and 4% by weight, in particular between 2.8% by weight and 3.5% by weight, preferably 3% by weight. The castability, strength, corrosion resistance, creep resistance and ductility can be set within certain limits by the choice of the aluminum content.

Gemäß der Erfindung ist die AS-Druckgusslegierung eine MgAl3Sil-Legierung (AS31) . Diese Legierung weist einen Aluminium-Gehalt und insbesondere weitere Legierungsbestandteile auf, die zwischen den Werten von AS21- und AS41-Legierungen liegen.According to the invention, the AS die casting alloy is a MgAl3Sil alloy (AS31). This alloy has an aluminum content and in particular further alloy components that lie between the values of AS21 and AS41 alloys.

Insbesondere besitzt die erfindungsgemäße AS-Druckgusslegierung einen Mn-Gehalt, der größer als 0/20 Gew.-% ist. Der Cu-Gehalt ist < 100 ppm. Der Ni-Gehalt liegt unter 20 pp . Der Fe-Gehalt liegt ebenfalls < 50 ppm. Der Si-Gehalt liegt zwischen 0,7 und 1,5 Gew.-%. Außerdem ist der Zn-Gehalt unterhalb von 0,20 Gew.-%.In particular, the AS die casting alloy according to the invention has an Mn content which is greater than 0/20% by weight. The Cu content is <100 ppm. The Ni content is below 20 pp. The Fe content is also <50 ppm. The Si content is between 0.7 and 1.5% by weight. In addition, the Zn content is below 0.20% by weight.

Schließlich ist in der Mg-Matrix relativ viel AI gelöst. Hieraus ergibt sich eine hohe Duktilitat, was weiter unten noch näher beschrieben wird. Dies wird insbesondere dadurch erreicht, dass die erfindungsgemäße AS-Druckgusslegierung wasserabgeschreckt ist.Finally, a relatively large amount of AI is dissolved in the Mg matrix. This results in a high ductility, which is described in more detail below. This is achieved in particular in that the AS die-casting alloy according to the invention is water-quenched.

Die oben genannte Aufgabe wird außerdem mit einem Verfahren zur Herstellung eines thermisch belastbaren Aggregatteil aus der eingangs genannten AS-Druckgusslegierung dadurch gelöst, dass es nach dem Abguss oder nach dem Öffnen der Druckguss- form in Wasser abgeschreckt wird.The above-mentioned object is also achieved with a method for producing a thermally resilient unit part from the above-mentioned AS die-casting alloy in that it is quenched in water after the casting or after the die-casting mold has been opened.

Wie bereits erwähnt, wird hierdurch eine hohe Duktilitat erzielt. Im Vergleich zur langsamen Abkühlung an Luft wird beim Wasserabschrecken mehr Aluminium in der Mg-Matrix gelöst, so dass sich erstens eine günstige Mischkristallhärtung ergibt, die das Gefüge im Gegensatz zur Mg17Al12-Ausscheidungshärtung kaum versprödet . Zweitens wird im Gegensatz zu einer Luftabkühlung gemäß dem Stand der Technik das nicht in der Mg- Matrix gelöste Aluminium in Form sehr feiner Mg17Al12-Phasen ausgeschieden .As already mentioned, this leads to a high ductility. In comparison to the slow cooling in air, more aluminum is dissolved in the Mg matrix when water is quenched, so that firstly there is a favorable mixed crystal hardening, which, in contrast to Mg 17 Al 12 precipitation hardening, hardly embrittles the structure. Secondly, in contrast to air cooling according to the prior art, the aluminum which is not dissolved in the Mg matrix is precipitated in the form of very fine Mg 17 Al 12 phases.

Drittens erfolgt die Ausscheidung beim Wasserabschrecken neben den Korngrenzen auch in der Mg-Matrix selbst . Hierdurch wird im Vergleich zur Luftabkühlung die Zugfestigkeit und die Dehngrenze der erfindungsgemäßen AS-Druckgusslegierung deutlich erhöht, ohne dass infolge des im Vergleich zu der bekannten AS21-Legierung angehobenen Aluminium-Gehalts sich die Zähigkeit verschlechtert, da nur wenig grobe Mg17Al12-Korngrenzenphasen entstehen.Thirdly, water quenching occurs in addition to the grain boundaries in the Mg matrix itself. As a result, the tensile strength and the yield strength of the AS die-cast alloy according to the invention are significantly increased in comparison to air cooling, without the toughness deteriorating as a result of the increased aluminum content compared to the known AS21 alloy, since only a few coarse Mg 17 Al 12 grain boundary phases arise.

Schließlich wird die thermische Stabilität des Gefüges bei der Langzeitbelastung bei 150°C merklich verbessert. So fungieren im Fall einer Luftabkühlung gemäß dem Stand der Technik die grob ausgeschiedenen Mg17Alχ2-Korngrenzenausscheidungen als Keimbildner für weitere Mgι7Al12-Phasen, so dass nach thermischer Alterung die Korngrenzen vollständig mit Mgi7Alι2-Phasen belegt bzw. verankert sind. Dies führt zu einer totalen Materialversprödung.Finally, the thermal stability of the structure is noticeably improved during long-term exposure at 150 ° C. Thus, in the case of air cooling in accordance with the prior art, the roughly precipitated Mg 17 Alχ 2 grain boundary precipitates act as nucleating agents for further Mg 7 Al 12 phases, so that after thermal aging the grain boundaries are completely covered or anchored with Mg i7 Al 2 phases are. This leads to total material embrittlement.

Bei der erfindungsgemäßen Wasserabschreckung der neuen As- Druckgusslegierung liegen weniger und feinere Mgι7Alι2- Korngrenzenausscheidungen und somit weniger Keimbildner vor, so dass bei thermischer Alterung die Korngrenzen kaum verspröden .In the water quenching of the new As die-casting alloy according to the invention, fewer and finer Mgι 7 Alι 2 grain boundary precipitates and thus fewer nucleating agents are present, so that the grain boundaries hardly become brittle during thermal aging.

Der erfindungsgemäße wasserabgeschreckte AS31-Druckguss erfährt nach einer thermischen Alterung von 2000 Stunden bei 150 °C nur einen geringfügigen Bruchdehnungsverlust, obwohl Zugfestigkeit und Dehngrenze durch das Ausscheiden weiterer feiner Mg17Alι2-Phasen vorteilhafterweise ansteigen. Hierdurch resultiert insgesamt ein exzellentes dynamisches Festigkeitsverhalten auch im Fall thermischer Beanspruchung bei 150 °C. Durch das Wasserabschrecken wird auch die Kriechbeständigkeit der erfindungsgemäßen Legierung verbessert. So ist, wie bereits erwähnt, von vornherein mehr Aluminium in der Mg-Matrix gelöst. Hierdurch wird die Kriechbeständigkeit so weit verbessert, dass das Lösungsverhalten von Aluminium-Schrauben trotz des höheren AI-Gehaltes der erfindungsgemäßen Legierung den der bekannten AS21-Legierung entspricht.The water-quenched AS31 die casting according to the invention experiences only a slight loss in elongation at break after a thermal aging of 2000 hours at 150 ° C., although tensile strength and yield strength advantageously increase due to the elimination of further fine Mg 17 Al 2 phases. This results in an excellent dynamic strength behavior, even in the case of thermal stress at 150 ° C. The water quenching also improves the creep resistance of the alloy according to the invention. As already mentioned, more aluminum is dissolved in the Mg matrix from the outset. This improves the creep resistance to such an extent that the dissolution behavior of aluminum screws corresponds to that of the known AS21 alloy despite the higher Al content of the alloy according to the invention.

Es hat sich gezeigt, dass bei einer wasserabgeschreckten AS41-Legierung das Relaxationsverhalten von Al-Schrauben bei 150°C schlechter ist, als bei der erfindungsgemäßen AS31- Legierung. Grund hierfür ist der höhere Aluminium-Gehalt in der AS41 -Legierung bzw. der höhere Anteil nicht kriechbeständiger Mgι7Al12-Korngrenzenphasen im Ausgangsgefüge .It has been shown that the relaxation behavior of Al screws at 150 ° C. is worse with a water-quenched AS41 alloy than with the AS31 alloy according to the invention. The reason for this is the higher aluminum content in the AS41 alloy or the higher proportion of non-creep-resistant Mgι 7 Al 12 grain boundary phases in the initial structure.

Die erfindungsgemäße AS31-Legierung, insbesondere ein hieraus hergestelltes Getriebegehäuse, besitzt eine Mindestzugfestigkeit von 180 MPa, eine Mindestdehngrenze von 110 MPa und die Mindestbruchdehnung im Bereich des Gussanschnittes liegt bei 6%.The AS31 alloy according to the invention, in particular a transmission housing made from it, has a minimum tensile strength of 180 MPa, a minimum yield strength of 110 MPa and the minimum elongation at break in the area of the cast gate is 6%.

Bevorzugt wird das aus der erfindungsgemäßen Legierung hergestellte Aggregatteil innerhalb von 60 s, insbesondere innerhalb von 40 s., vorzugsweise innerhalb von 30 s, nach dem Ab- guss oder nach dem Öffnen der Druckgussform in Wasser abgeschreckt . Durch diese unmittelbar nach dem Abguss erfolgende Temperaturabsenkung wird, wie oben erwähnt, vermieden, dass sich grobe Mgι7Al12-Korngrenzenphasen im Übermaß ausbilden. The assembly part produced from the alloy according to the invention is preferably quenched in water within 60 s, in particular within 40 s, preferably within 30 s, after casting or after opening the die-casting mold. As mentioned above, this lowering of the temperature immediately after the casting process prevents coarse Mgι 7 Al 12 grain boundary phases from forming in excess.

Claims

Patentansprüche claims 1. AS-Druckgusslegierung, insbesondere für thermisch belastete Aggregatteile im Kraftfahrzeug-Bereich, d a d u r c h g e k e n n z e i c h n e t , dass deren Al-Gehalt zwischen dem Al-Gehalt der AS21- und AS 1-Legierungen liegt.1. AS die-casting alloy, especially for thermally stressed unit parts in the motor vehicle sector, so that their Al content lies between the Al content of the AS21 and AS 1 alloys. 2. AS-Druckgusslegierung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass der Al-Gehalt zwischen 2,5 Gew.-% und 4 Gew.-%, insbesondere zwischen 2,8 Gew.% und 3,5 Gew.-% liegt und bevorzugt 3 Gew.-% ist.2. AS die-casting alloy according to claim 1, characterized in that the Al content is between 2.5% by weight and 4% by weight, in particular between 2.8% by weight and 3.5% by weight, and is preferred 3% by weight. 3. AS-Druckgusslegierung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass sie eine MgAl 3 Si 1-Legierung (AS31) ist.3. AS die-casting alloy according to one of the preceding claims, that it is a MgAl 3 Si 1 alloy (AS31). 4. AS-Druckgusslegierung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass der Mn-Gehalt > als 0,20 Gew.-% ist.4. AS die-casting alloy according to one of the preceding claims, that the mn content is> than 0.20% by weight. 5. AS-Druckgusslegierung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass der Cu-Gehalt < 100 ppm ist. 5. AS die-casting alloy according to one of the preceding claims, characterized in that the Cu content is <100 ppm. 6. AS-Druckgusslegierung nach einem der vorhergehenden Ansprüche , d a d u r c h g e k e n n z e i c h n e t , dass der Ni-Gehalt < 20 ppm ist.6. AS die-casting alloy according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the Ni content is <20 ppm. 7. AS-Druckgusslegierung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass der Fe-Gehalt < 50 ppm ist.7. AS die-casting alloy according to one of the preceding claims, that a d u r c h g e k e n n z e i c h n e t that the Fe content is <50 ppm. 8. AS-Druckgusslegierung nach einem der vorhergehenden Ansprüche , d a d u r c h g e k e n n z e i c h n e t , dass der Si-Gehalt zwischen 0,7 und 1,5 Gew.-% liegt.8. AS die-casting alloy according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the Si content is between 0.7 and 1.5 wt .-%. 9. AS-Druckgusslegierung nach einem der vorhergehenden Ansprüche , d a d u r c h g e k e n n z e i c h n e t , dass der Zn-Gehalt < 0,20 Gew.-% ist.9. AS die-casting alloy according to one of the preceding claims, that the zn content is <0.20% by weight. 10. AS-Druckgusslegierung nach einem der vorhergehenden Ansprüche , d a d u r c h g e k e n n z e i c h n e t , dass relativ viel AI in der Mg-Matrix gelöst ist.10. AS die-casting alloy according to one of the preceding claims, that a relatively large amount of Al is dissolved in the Mg matrix. 11. AS-Druckgusslegierung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass sie wasserabgeschreckt ist.11. AS die-casting alloy according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that it is water-quenched. 12. Verfahren zur Herstellung eines thermisch belastbaren Aggregatteils aus einer AS-Druckgusslegierung nach einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass es nach dem Abguss oder nach dem Öffnen der Druckgussform in Wasser abgeschreckt wird. 12. A method for producing a thermally resilient unit part from an AS die-casting alloy according to one of the preceding claims, characterized in that it is quenched in water after casting or after opening the die-casting mold. 3. Verfahren nach Anspruch 12, d a d u r c h g e k e n n z e i c h n e t , dass das Abschrecken des Druckgussteils in Wasser innerhalb von 60 s, insbesondere 40 s, und vorzugsweise 30 s nach dem Abguss oder nach dem Öffnen erfolgt. 3. The method according to claim 12, that the quenching of the die-cast part in water takes place within 60 s, in particular 40 s, and preferably 30 s after the casting or after opening.
PCT/EP2003/006727 2002-07-05 2003-06-26 As-magnesium pressure die cast alloy and method for producing a subassembly part from an as-magnesium pressure die cast alloy of this type Ceased WO2004005563A1 (en)

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DE10230276.6 2002-07-05

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