EP1718778A1 - Material based on an aluminum alloy, method for the production thereof and its use - Google Patents

Material based on an aluminum alloy, method for the production thereof and its use

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Publication number
EP1718778A1
EP1718778A1 EP05714972A EP05714972A EP1718778A1 EP 1718778 A1 EP1718778 A1 EP 1718778A1 EP 05714972 A EP05714972 A EP 05714972A EP 05714972 A EP05714972 A EP 05714972A EP 1718778 A1 EP1718778 A1 EP 1718778A1
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EP
European Patent Office
Prior art keywords
mass
magnesium
base alloy
content
alloy
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Granted
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EP05714972A
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German (de)
French (fr)
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EP1718778B1 (en
Inventor
Ulrich Bischofberger
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Mahle GmbH
Peak Werkstoff GmbH
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Mahle GmbH
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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
    • 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
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • 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
    • 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
    • C22F1/047—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 magnesium as the next major constituent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0084—Pistons  the pistons being constructed from specific materials

Definitions

  • the present invention relates to a method for producing a material based on an aluminum alloy according to the preamble of claim 1, a material obtainable with this method and the use of this material.
  • pistons have typically been made from cast aluminum-silicon alloys. Because of the good casting properties, pistons based on aluminum-silicon alloys can be manufactured relatively cheaply and easily using the permanent mold casting process.
  • These materials are typically with silicon contents between 12 and 18 wt .-%, in individual cases also up to 24 wt .-%, and with admixtures of magnesium between 1 to 1.5 wt .-%, copper between 1 and 3 wt .-% % and often nickel alloyed between 1 to 3 wt .-%.
  • z. B. according to US Pat. No. 6,419,769 A1 recommends setting the copper content between 5.6 and 8.0% by weight.
  • FR 2 690 957 A1 the strength of such an alloy is further increased by adding the elements titanium, zirconium and vanadium. However, the alloying of these strength-increasing elements increases the density of the material.
  • a heat-resistant alloy with a reduced specific weight is described in patent specification DE 747 355 as being particularly advantageous for pistons.
  • This material is characterized by a magnesium content between 4 and 12 wt .-% and a silicon content between 0.5 and 5 wt .-%, the silicon content should always be less than half the magnesium content. Furthermore, between 0.2 and 5% by weight of copper and / or nickel are added. Even without the addition of strength-enhancing components, this material should be characterized by improved heat resistance.
  • the magnesium is therefore added depending on the silicon content desired in each case according to the above formula. Some of the magnesium (1.73xSi content) reacts directly with silicon to form magnesium silicide, the remaining 1.5 to 6.0% by mass of magnesium dissolve in the aluminum mixed crystal and, after suitable heat treatment together with copper, increase the strength of the material.
  • the material can contain the usual impurities in aluminum alloys. In addition, the alloying of further alloying elements could appear sensible for the purpose of further strengthening. It is known e.g.
  • the material obtainable by the process according to the invention is distinguished by excellent strength properties which, even at elevated temperatures, prove to be superior to the piston alloys customary today.
  • Advantageous further developments result from the subclaims.
  • the base alloy can be treated with all known hot forming processes, for example extrusion, hot rolling or forging. Hot forming should be carried out with a degree of deformation greater than 5 times.
  • the aluminum or base alloy used should only contain a small proportion of foreign elements, and not more than 1% by mass per foreign element.
  • a heat treatment is advantageously carried out after the hot shaping. This can be done in a manner known per se by solution annealing, quenching and hot aging.
  • the material according to the invention is suitable for the production of all types of components, in particular pistons for internal combustion engines.
  • the resulting raw material is pre-heated to 400 to 500 ° C warms and 10 times formed by extrusion and then hardened. For this purpose, a heat treatment comprising solution annealing at 500 ° C. for 2 hours, quenching in water and 10 hours tempering at 210 ° C. is carried out
  • a heat treatment comprising solution annealing at 500 ° C. for 2 hours, quenching in water and 10 hours tempering at 210 ° C. is carried out.
  • Beryllium is added to reduce the tendency of the melt to oxidize.
  • Magnesium phosphate is used to refine the grain of the primarily solidifying magnesium silicide. Iron was analyzed as an impurity.
  • the finished material shows the following properties:
  • the material according to the invention is distinguished from the British aluminum standard 2618 by a lower density and an increased modulus of elasticity.
  • the static strength properties achieved match the high-strength wrought alloy 2618.
  • the fatigue strength determined clearly exceeds the values achieved with the wrought alloy 2618.
  • the material according to the invention is superior in both static and dynamic testing. This combination of properties makes it particularly suitable for the manufacture of pistons for internal combustion engines.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Extrusion Of Metal (AREA)
  • Forging (AREA)

Abstract

The invention relates concerns a method for producing a substance during which an aluminum base alloy is produced that has a content of 5.5 to 13.0 % by mass of silicon and a content of magnesium according to formula Mg [ % by mass] = 1.73 x Si [ % by mass] + m with m = 1.5 to 6.0 % by mass of magnesium, and has a copper content ranging from 1.0 to 4.0 % by mass. The base alloy is then subjected to at least one hot working and, afterwards, to a heat treatment consisting of solution annealing, quenching and artificial aging. The magnesium is added based on the respectively desired silicon content according to the aforementioned formula. The material obtained by using the inventive method is characterized by having a low density and a high strength.

Description

Werkstoff auf der Basis einer Aluminium-Legierung, Verfahren zu seiner Herstellung sowie Verwendung hierfür Material based on an aluminum alloy, process for its production and use therefor
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Werkstoffs auf der Basis einer Aluminium-Legierung nach dem Oberbegriff des Anspruchs 1 , einen mit diesem Verfahren erhältlichen Werkstoff sowie eine Verwendung dieses Werkstoffs.The present invention relates to a method for producing a material based on an aluminum alloy according to the preamble of claim 1, a material obtainable with this method and the use of this material.
In den letzten Jahren ist bei Verbrennungsmotoren für Kraftfahrzeuge verstärkt ein Trend hin zu noch leichteren und kompakteren Aggregaten mit gesteigerten spezifischen Leistungen zu beobachten. Dies führt unter anderem auch zu einer immer stärkeren Belastung der hierfür eingesetzten Kolben. Diesem Trend kann sowohl durch geänderte Konstruktionen, aber auch vor allem durch die Entwicklung neuer geeigneter Werkstoffe Rechnung getragen werden. Im Vordergrund steht dabei der Wunsch nach hoch warmfesten und spezifisch leichten Materialien.In recent years, there has been an increasing trend in internal combustion engines for motor vehicles towards even lighter and more compact units with increased specific outputs. Among other things, this leads to an ever increasing load on the pistons used for this purpose. This trend can be taken into account not only through modified constructions, but above all through the development of new, suitable materials. The focus here is on the desire for highly heat-resistant and specifically lightweight materials.
Bis jetzt werden Kolben üblicherweise aus Aluminium-Silizium-Gusslegierungen hergestellt. Wegen der guten Gießeigenschaften lassen sich Kolben auf der Basis von Aluminium-Silizium-Legierungen relativ preisgünstig und einfach im Kokillengussverfahren herstellen.So far, pistons have typically been made from cast aluminum-silicon alloys. Because of the good casting properties, pistons based on aluminum-silicon alloys can be manufactured relatively cheaply and easily using the permanent mold casting process.
Diese Werkstoffe werden typischerweise mit Siliziumgehalten zwischen 12 und 18 Gew.-%, in Einzelfällen auch bis zu 24 Gew.-%, sowie mit Beimengungen von Magnesium zwischen 1 bis 1 ,5 Gew.-%, Kupfer zwischen 1 und 3 Gew.-% und häufig auch Nickel zwischen 1 bis 3 Gew.-% legiert. Um die Warmfestigkeit einer solchen Legierung zu verbessern, wird z. B. gemäß der US 6 419 769 A1 empfohlen, den Kupfergehalt zwischen 5,6 und 8,0 Gew.-% einzustellen. Nach der FR 2 690 957 A1 wird die Festigkeit einer derartigen Legierung durch Zugabe der Elemente Titan, Zirkonium und Vanadium zusätzlich gesteigert. Allerdings wird durch das Zulegieren dieser festigkeitssteigernden Elemente die Dichte des Werkstoffs erhöht.These materials are typically with silicon contents between 12 and 18 wt .-%, in individual cases also up to 24 wt .-%, and with admixtures of magnesium between 1 to 1.5 wt .-%, copper between 1 and 3 wt .-% % and often nickel alloyed between 1 to 3 wt .-%. In order to improve the heat resistance of such an alloy, z. B. according to US Pat. No. 6,419,769 A1 recommends setting the copper content between 5.6 and 8.0% by weight. According to FR 2 690 957 A1 the strength of such an alloy is further increased by adding the elements titanium, zirconium and vanadium. However, the alloying of these strength-increasing elements increases the density of the material.
Eine warmfeste Legierung mit reduziertem spezifischem Gewicht wird in der Patentschrift DE 747 355 als für Kolben besonders vorteilhaft beschrieben. Dieser Werkstoff zeichnet sich durch einen Magnesiumgehalt zwischen 4 und 12 Gew.-% und einen Siliziumgehalt zwischen 0,5 und 5 Gew.-% aus, wobei der Siliziumgehalt stets geringer als die Hälfte des Magnesiumgehalts sein soll. Ferner sind zwischen 0,2 und 5 Gew.-% Kupfer und/oder Nickel zulegiert. Dieser Werkstoff soll sich auch bei Verzicht auf die Zulegierung festigkeitssteigernder Komponenten durch eine verbesserte Warmfestigkeit auszeichnen.A heat-resistant alloy with a reduced specific weight is described in patent specification DE 747 355 as being particularly advantageous for pistons. This material is characterized by a magnesium content between 4 and 12 wt .-% and a silicon content between 0.5 and 5 wt .-%, the silicon content should always be less than half the magnesium content. Furthermore, between 0.2 and 5% by weight of copper and / or nickel are added. Even without the addition of strength-enhancing components, this material should be characterized by improved heat resistance.
In der DE 38 42 812 A1 wird ein Gussleichtwerkstoff auf Basis einer Aluminiumlegierung mit 5 bis 25 Masse-% Magnesiumsilizid beschrieben. Neben Magnesiumsilizid wird außerdem als vorteilhaft sowohl ein Überschuß von Silizium (bis 12 Masse%) als auch von Magnesium (bis 15 Masse%) betrachtet. Ferner können bis zu 5 Masse-% Kupfer, Nickel, Mangan und Kobalt zulegiert sein. In Unteranspruch 5 wird zusätzlich die Liquidustemperatur von <700°C im Dreistoffsystem Al-Si-Mg als begrenzendes Limit genannt. Vorteile bzw. Nachteile bei den mechanischen Eigenschaften, welche sich aus einem Überschuß von Magnesium bzw. Siliziums ergeben könnten werden nicht explizit erwähnt.DE 38 42 812 A1 describes a lightweight casting material based on an aluminum alloy with 5 to 25% by mass of magnesium silicide. In addition to magnesium silicide, both an excess of silicon (up to 12% by mass) and magnesium (up to 15% by mass) are also considered advantageous. Up to 5% by mass of copper, nickel, manganese and cobalt can also be alloyed. In sub-claim 5, the liquidus temperature of <700 ° C in the three-substance system Al-Si-Mg is also mentioned as a limiting limit. Advantages or disadvantages of the mechanical properties, which could result from an excess of magnesium or silicon, are not explicitly mentioned.
Diese bekannten Werkstoffe sind ausnahmslos Gusswerkstoffe. Es besteht allerdings auch ein Bedarf an Werkstoffen mit noch geringerer Dichte und noch höherer Festigkeit, die durch die ausschließliche Verwendung eines Gießverfahrens bisher nicht herstellbar sind.These known materials are all cast materials. However, there is also a need for materials with an even lower density and even higher strength, which until now could not be produced by the exclusive use of a casting process.
Demgemäß ist Gegenstand der vorliegenden Erfindung ein Verfahren zur Herstellung eines Werkstoffs, wobei eine Aluminium-Basislegierung mit einem Gehalt zwischen 5,5 und 13,0 Masse-% Silizium, zusätzlich einem Gehalt an Magnesium gemäß der Formel Mg [Masse-%] = 1 ,73 x Si [Masse-%] + m mit m = 1 ,5 bis 6,0 Masse-% Magnesium sowie Kupfer mit einem Gehalt zwischen 1 ,0 und 4,0 Gew.% (Rest Aluminium) - erschmolzen, gegossen oder durch Sprühkompaktieren vorverdichtet und die Basislegierung anschließend zumindest einmal warmumgeformt wird, sowie nachfolgend einer Wärmebehandlung bestehend aus Lösungsglühen, Abschrecken und Warmauslagern unterzogen wird.Accordingly, the present invention relates to a method for producing a material, an aluminum-based alloy with a content between 5.5 and 13.0 mass% silicon, additionally a content of magnesium according to the formula Mg [mass%] = 1.73 x Si [mass%] + m with m = 1.5 to 6.0 mass -% magnesium and copper with a content between 1, 0 and 4.0% by weight (rest of aluminum) - melted, cast or pre-compressed by spray compacting and the base alloy is subsequently hot-worked at least once, followed by heat treatment consisting of solution annealing, quenching and Is subjected to hot aging.
Das Magnesium wird also in Abhängigkeit vom jeweils gewünschten Siliziumgehalt gemäß der oben genannten Formel zugesetzt. Dabei reagiert ein Teil des Magnesiums (1 ,73xSi-Gehalt) direkt mit Silizium zu Magnesiumsilizid, die restlichen 1 ,5 bis 6,0 Masse-% Magnesium lösen sich im Aluminiummischkristall und bewirken nach geeigneter Wärmebehandlung zusammen mit Kupfer eine Festigkeitssteigerung des Werkstoffs. Der Werkstoff kann die in Aluminiumlegierungen üblichen Verunreinigungen enthalten. Zusätzlich könnte zum Zwecke einer weiteren Festigkeitssteigerung das Zulegieren weiterer Legierungselemente sinnvoll erscheinen. Bekannt ist z.B. die festigkeitssteigernde Wirkung kleiner Zugabemengen (0,05 bis 0,2% von Titan, Zirkon oder Vanadin (FR 2 690 957 A1), ebenso bekannt ist die Wirkung von 0,1 bis 0,5% Silber welches bei AICu-Legierungen sich positiv auf die Warmfestigkeitseigenschaften auswirkt. Ohne Nachteile für die mechanischen Eigenschaften wirkt sich die Zugabe von kleinen Gehalten (0,2 bis 2%) weiterer, der für viele Aluminium-Kupfer-Magnesiumlegierungen zusätzlich Verwendung findender Legierungselemente z.B. Nickel, Kobalt oder Mangan oder Eisen aus. Durch die Zugabe vorgenannter Elemente, wird jedoch zumeist die Dichte des beanspruchten Leichtbauwerkstoffes erhöht.The magnesium is therefore added depending on the silicon content desired in each case according to the above formula. Some of the magnesium (1.73xSi content) reacts directly with silicon to form magnesium silicide, the remaining 1.5 to 6.0% by mass of magnesium dissolve in the aluminum mixed crystal and, after suitable heat treatment together with copper, increase the strength of the material. The material can contain the usual impurities in aluminum alloys. In addition, the alloying of further alloying elements could appear sensible for the purpose of further strengthening. It is known e.g. the strength-increasing effect of small additions (0.05 to 0.2% of titanium, zircon or vanadium (FR 2 690 957 A1), also known is the effect of 0.1 to 0.5% silver which is positive with AICu alloys The addition of small contents (0.2 to 2%) of other alloying elements which are also used for many aluminum-copper-magnesium alloys, for example nickel, cobalt or manganese or iron, has no disadvantages for the mechanical properties. However, the addition of the aforementioned elements usually increases the density of the lightweight material used.
Der nach dem erfindungsgemäßen Verfahren erhältliche Werkstoff zeichnet sich neben seiner geringen Dichte durch ausgezeichnete Festigkeitseigenschaften aus, die sich auch bei erhöhten Temperaturen gegenüber den heutigen gebräuchlichen Kolbenlegierungen als überlegen zeigen. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.In addition to its low density, the material obtainable by the process according to the invention is distinguished by excellent strength properties which, even at elevated temperatures, prove to be superior to the piston alloys customary today. Advantageous further developments result from the subclaims.
Die Basislegierung kann mit allen bekannten Warmumformverfahren, bspw. Strangpressen, Warmwalzen oder Schmieden behandelt werden. Das Warmumformen sollte mit einem Umformgrad größer als 5-fach durchgeführt werden.The base alloy can be treated with all known hot forming processes, for example extrusion, hot rolling or forging. Hot forming should be carried out with a degree of deformation greater than 5 times.
Um die Qualität des Werkstoffs nicht zu beeinträchtigen, sollte das verwendete Aluminium bzw. die Basislegierung Fremdelemente nur in einem geringen Anteil, und zwar nicht mehr als jeweils 1 Masse-% pro Fremdelement, enthalten.In order not to impair the quality of the material, the aluminum or base alloy used should only contain a small proportion of foreign elements, and not more than 1% by mass per foreign element.
Zur Erzielung maximaler Festigkeitseigenschaften wird vorteilhaft nach der Warmformgebung eine Wärmebehandlung durchgeführt. Diese kann auf an sich bekannte Weise durch Lösungsglühen, Abschrecken und Warmauslagern erfolgen.To achieve maximum strength properties, a heat treatment is advantageously carried out after the hot shaping. This can be done in a manner known per se by solution annealing, quenching and hot aging.
Der erfindungsgemäße Werkstoff eignet sich zur Herstellung von Bauteilen aller Art, insbesondere von Kolben für Verbrennungsmotoren.The material according to the invention is suitable for the production of all types of components, in particular pistons for internal combustion engines.
Ausführungsbeispiel 1:Example 1:
Eine Legierung A der folgenden Zusammensetzung:An alloy A with the following composition:
8,1 Masse-% Silizium 17,2 Masse-% Magnesium 1 ,7 Masse-% Kupfer 0,3 Masse-% Eisen 50 ppm Beryllium Rest Aluminium8.1 mass% silicon 17.2 mass% magnesium 1, 7 mass% copper 0.3 mass% iron 50 ppm beryllium balance aluminum
wird hergestellt, indem die einzelnen Elemente nach den üblichen Verfahren legiert und mittels dem Verfahren des Sprühkompaktierens zu einem zylindrischen Block vergossen werden, Das resultierende Vormaterial wird auf 400 bis 500°C vorge- wärmt und durch Strangpressen 10-fach umgeformt und anschließend gehartet Dazu wird eine Wärmebehandlung, umfassend Losungsgluhen bei 500°C für 2 Stunden, Abschrecken in Wasser und 10 Stunden Anlassen bei 210°C durchgeführtis produced by alloying the individual elements according to the usual methods and casting them into a cylindrical block using the spray compacting method. The resulting raw material is pre-heated to 400 to 500 ° C warms and 10 times formed by extrusion and then hardened. For this purpose, a heat treatment comprising solution annealing at 500 ° C. for 2 hours, quenching in water and 10 hours tempering at 210 ° C. is carried out
Beryllium wird zugegeben, um die Oxidationsneigung der Schmelze zu mindern Eisen wurde als Verunreinigung analysiertBeryllium is added to reduce the tendency of the melt to oxidize. Iron was analyzed as an impurity
Ausführungsbeispiel 2:Example 2:
Eine Legierung B der folgenden ZusammensetzungAn alloy B of the following composition
6.0 Masse-% Silizium 12,5 Masse-% Magnesium6.0 mass% silicon 12.5 mass% magnesium
2.1 Masse-% Kupfer 0,2 Masse-% Eisen 50 ppm Beryllium2.1% by mass copper 0.2% by mass iron 50 ppm beryllium
1 ,0 Gew -% Magnesiumphosphat Rest Aluminium1.0% by weight magnesium phosphate remainder aluminum
wird hergestellt, indem die einzelnen Elemente nach den üblichen Verfahren legiert und mittels Stranggießen zu einem zylindrischen Block vergossen werden Das resultierende Vormateπal wird auf 400 bis 500°C vorgewärmt und durch Strangpressen 10-fach umgeformt und anschließend gehartet Dazu wird eine Wärmebehandlung, umfassend Losungsgluhen bei 500°C für 2 Stunden, Abschrecken in Wasser und 10 Stunden Anlassen bei 210°C durchgeführtis produced by alloying the individual elements according to the usual methods and casting them into a cylindrical block by means of continuous casting. The resulting raw material is preheated to 400 to 500 ° C and then 10 times formed by extrusion and then hardened. This involves a heat treatment, including solution annealing 500 ° C for 2 hours, quenching in water and 10 hours tempering at 210 ° C
Beryllium wird zugegeben, um die Oxidationsneigung der Schmelze zu mindern, Magnesiumphosphat dient der Kornfeinung des primär erstarrenden Magnesiumsili- zids Eisen wurde als Verunreinigung analysiert Ausführungsbeispiel 3:Beryllium is added to reduce the tendency of the melt to oxidize. Magnesium phosphate is used to refine the grain of the primarily solidifying magnesium silicide. Iron was analyzed as an impurity Example 3:
Eine Legierung C der folgenden Zusammensetzung:An alloy C of the following composition:
12,9 Masse-% Silizium12.9 mass% silicon
25,1 Masse-% Magnesium25.1% by mass of magnesium
1 ,9 Masse-% Kupfer1.9 mass% copper
0,15 Masse-% Eisen0.15 mass% iron
50 ppm Beryllium50 ppm beryllium
0,9 Gew.-% Magnesiumphosphat0.9% by weight magnesium phosphate
Rest AluminiumRest aluminum
wird hergestellt, indem die einzelnen Elemente nach den üblichen Verfahren legiert und mittels Stranggießen zu einem zylindrischen Block vergossen werden. Das resultierende Vormaterial wird auf 400 bis 500°C vorgewärmt und durch Strangpressen 10-fach umgeformt und anschließend gehärtet. Dazu wird eine Wärmebehandlung, umfassend Lösungsglühen bei 500°C für 2 Stunden, Abschrecken in Wasser und 10 Stunden Anlassen bei 210°C durchgeführt.is produced by alloying the individual elements using the usual methods and casting them into a cylindrical block using continuous casting. The resulting primary material is preheated to 400 to 500 ° C and extruded 10 times and then hardened. For this purpose, a heat treatment comprising solution annealing at 500 ° C. for 2 hours, quenching in water and 10 hours tempering at 210 ° C. is carried out.
Beryllium wird zugegeben, um die Oxidationsneigung der Schmelze zu mindern, Magnesiumphosphat dient der Kornfeinung des primär erstarrenden Magnesiumsili- zids. Eisen wurde als Verunreinigung analysiert.Beryllium is added to reduce the tendency of the melt to oxidize. Magnesium phosphate is used to refine the grain of the primarily solidifying magnesium silicide. Iron was analyzed as an impurity.
Der fertige Werkstoff zeigt die folgenden Eigenschaften:The finished material shows the following properties:
Der erfindungsgemäße Werkstoff zeichnet sich gegenüber dem britischen Aluminium-Standard 2618 durch eine niedrigere Dichte und einem erhöhten E-Modul aus. Die erzielten statischen Festigkeitseigenschaften reichen an die hochfeste Knetlegierung 2618 heran. Die ermittelte Ermüdungsfestigkeit übertrifft die mit der Knetlegierung 2618 erzielten Werte deutlich. Gegenüber der Gusslegierung aus der US 6 419 769 A ist der erfindungsgemäße Werkstoff sowohl bei statischer als auch bei dynamischer Prüfung überlegen. Er eignet sich aufgrund dieser Eigenschaftskombination in besonderer Weise zur Herstellung von Kolben für Verbrennungsmotoren. The material according to the invention is distinguished from the British aluminum standard 2618 by a lower density and an increased modulus of elasticity. The static strength properties achieved match the high-strength wrought alloy 2618. The fatigue strength determined clearly exceeds the values achieved with the wrought alloy 2618. Compared to the cast alloy from US Pat. No. 6,419,769 A, the material according to the invention is superior in both static and dynamic testing. This combination of properties makes it particularly suitable for the manufacture of pistons for internal combustion engines.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung eines Werkstoffs, wobei eine Aluminium-Basislegierung mit einem Gehalt an 5,5 bis 13,0 Masse-% Silizium und einem Gehalt an Magnesium gemäß der Formel Mg [Masse-%] = 1 ,73 x Si [Masse-%] + m mit m = 1 ,5 bis 6,0 Masse-% Magnesium sowie mit einem Kupfergehalt zwischen 1 ,0 und 4,0 Masse-% hergestellt wird, die Basislegierung danach zumindest einmal warmumgeformt, sowie nachfolgend einer Wärmebehandlung bestehend aus Lösungsglühen, Abschrecken und Warmauslagern unterzogen wird.1. A method for producing a material, wherein an aluminum-based alloy with a content of 5.5 to 13.0 mass% silicon and a content of magnesium according to the formula Mg [mass%] = 1.73 x Si [mass -%] + m with m = 1, 5 to 6.0 mass% magnesium and with a copper content between 1, 0 and 4.0 mass% is produced, the base alloy thereafter at least once hot-formed, and subsequently consisting of a heat treatment Solution annealing, quenching and hot aging is subjected.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Basislegierung mittels Sprühkompaktieren hergestellt wird.2. The method according to claim 1, characterized in that the base alloy is produced by spray compacting.
3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Basislegierung mittels dem Verfahren des Stranggießens hergestellt wird.3. The method according to claim 1, characterized in that the base alloy is produced by means of the process of continuous casting.
4. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Basislegierung mittels dem Verfahren des Kokillengießens hergestellt wird.4. The method according to claim 1, characterized in that the base alloy is produced by means of the mold casting process.
5. Verfahren nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Basislegierung zum Zwecke der Kornfeinung des sich bildenden Primär-Magnesium- silizids 0,5 — 1 ,5 Gew.% Magnesiumphosphat enthält.5. The method according to claim 3 or 4, characterized in that the base alloy contains 0.5-1.5% by weight of magnesium phosphate for the purpose of grain refinement of the primary magnesium silicide which forms.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Basislegierung mittels Strangpressen, Warmwalzen oder Schmieden warmumgeformt wird. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass das Warmumformen mit einem Umformgrad großer als 5-fach durchgeführt wird6. The method according to any one of the preceding claims, characterized in that the base alloy is hot-formed by means of extrusion, hot rolling or forging. A method according to claim 3, characterized in that the hot forming is carried out with a degree of deformation greater than 5 times
Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass 1 ,5 bis 3,0 Masse-% Kupfer zulegiert werdenMethod according to one of the preceding claims, characterized in that 1, 5 to 3.0 mass% copper are alloyed
Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das verwendete Aluminium nicht mehr als jeweils 1 Masse-% Fremdelemente enthaltMethod according to one of the preceding claims, characterized in that the aluminum used contains no more than 1% by mass of foreign elements
Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass der Werkstoff 2h bei 500°C durchgewärmt, in Wasser abgeschreckt und anschließend 10 h bei 210°C angelassen wirdA method according to claim 1, characterized in that the material is heated for 2 hours at 500 ° C, quenched in water and then tempered at 210 ° C for 10 hours
Werkstoff auf Basis einer Aluminium-Legierung, erhältlich durch ein Verfahren gemäß einem der Ansprüche 1 bis 10Material based on an aluminum alloy, obtainable by a method according to one of claims 1 to 10
Verwendung des Werkstoffs nach Anspruch 11 zur Herstellung von BauteilenUse of the material according to claim 11 for the production of components
Bauteil nach Anspruch 12, namhch Kolben für Verbrennungsmotoren Component according to claim 12, namely pistons for internal combustion engines
EP05714972.6A 2004-02-16 2005-02-15 Material based on an aluminum alloy, method for the production thereof and its use Expired - Fee Related EP1718778B1 (en)

Applications Claiming Priority (2)

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DE102004007704A DE102004007704A1 (en) 2004-02-16 2004-02-16 Production of a material based on an aluminum alloy used for producing motor vehicle engine components comprises forming an aluminum base alloy containing silicon and magnesium, hot deforming and heat treating
PCT/DE2005/000254 WO2005078147A1 (en) 2004-02-16 2005-02-15 Material based on an aluminum alloy, method for the production thereof and its use

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EP (1) EP1718778B1 (en)
JP (1) JP4914225B2 (en)
KR (1) KR101220577B1 (en)
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BR (1) BRPI0507719B1 (en)
DE (1) DE102004007704A1 (en)
WO (1) WO2005078147A1 (en)

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DE102007035115A1 (en) 2007-07-27 2009-01-29 FNE Forschungsinstitut für Nichteisen-Metalle GmbH Aluminum-matrix material for building contains concentration gradient of magnesium silicide

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US20070169861A1 (en) 2007-07-26
EP1718778B1 (en) 2017-04-19
JP2007522348A (en) 2007-08-09
KR101220577B1 (en) 2013-01-10
KR20060127147A (en) 2006-12-11
BRPI0507719A (en) 2007-07-03
BRPI0507719B1 (en) 2013-11-26
CN1918311A (en) 2007-02-21
JP4914225B2 (en) 2012-04-11
CN100503857C (en) 2009-06-24
US7892482B2 (en) 2011-02-22
DE102004007704A1 (en) 2005-08-25
WO2005078147A1 (en) 2005-08-25

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