EP2175042B1 - Corrosion-resistant aluminium extrusion profile and method for manufacturing a structure component - Google Patents

Corrosion-resistant aluminium extrusion profile and method for manufacturing a structure component Download PDF

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EP2175042B1
EP2175042B1 EP20090011984 EP09011984A EP2175042B1 EP 2175042 B1 EP2175042 B1 EP 2175042B1 EP 20090011984 EP20090011984 EP 20090011984 EP 09011984 A EP09011984 A EP 09011984A EP 2175042 B1 EP2175042 B1 EP 2175042B1
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alloy
extrusion
heat treatment
corrosion
extruded section
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French (fr)
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EP2175042A1 (en
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Hubert Dr. Koch
Jana Dipl.-Ing. Ehrke
Marcel Dr. Rosefort
Dieter Dr. Bramhoff
Horst Gers
Dirk Schnapp
Thomas Dipl.-Ing. Köhler
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Trimet Aluminium SE
Martinrea Honsel Germany GmbH
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Trimet Aluminium SE
Martinrea Honsel Germany GmbH
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    • 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
    • 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

Definitions

  • the invention relates to a corrosion-resistant aluminum extruded profile of an ALSiMg alloy, preferably a multi-chamber hollow profile and method for
  • the strength of aluminum wrought alloys of the AlMgSi type (6xxxx alloys) is essentially set by the alloying process (D. Altenpohl: "Aluminum viewed from the inside", Aluminum-Verlag). In this case, foreign atoms or precipitates act as impurities in the lattice of the Al microstructure. In the AlMgSi alloy type, it is the Mg 2 Si intermetallic compound which increases strength.
  • N.C. Parson et al. investigated Alloy Extrusion Ingots' microstructural alterations of 6000 series aluminum alloys at different homogenization parameters in The Effect of Heat Treatment.
  • JP 11181539 discloses an Al-Mg-Si-Cu alloy which is free of a recrystallized structure in the surface layer.
  • the aluminum alloy is composed of 0.8-1.2 wt.% Mg, 0.4 to 0.8 wt.% Si, 0.15 to 0.4 wt.% Cu, Al and other substances.
  • JP 2000282162 discloses 6000 series Al alloys with high corrosion protection even in an aggressive environment of Cl ions.
  • the object of the present invention was to produce an extruded profile, with which at least the previously known deformation and corrosion properties are achieved, but with higher strength properties, namely Rp 0.2> 280 MPa, Rm ⁇ 300 MPa and A ⁇ 10%.
  • the extruded profile according to the invention also has a microstructure with molded intermetallic phases of the type alpha-AlFeSi, beta-AlFeSi, Al15FeMn3Si2, Mg2Si, theta-AlCu, the particles of intermetallic phases being globulitically shaped and having a diameter ⁇ 1 ⁇ m.
  • the H 2 content of the melt is adjusted in the usual way by chlorination, by nitrogen or argon rinsing treatment.
  • the alloy is characterized by an excess of Mg, with the preferred weight ratio of magnesium to silicon in the alloy composition ranging from 1 to 2 at an alloy content of Si 0.30-0.60%.
  • the deformation properties and the ductility can be significantly improved if the contents of Mn, Fe, Cu and optionally Ti and Cr are significantly limited (see claim 1).
  • Mn and Cr are added during homogenization form dispersoids which can prevent recrystallization of the microstructure. These dispersoids reduce the local stresses in the structure and thereby increase the ductility.
  • the optimum content for Mn is between 0.05 and 0.10 and for Cr between 0.01 and 0.12%.
  • Titanium also increases ductility, with the content being between 0.01-0.12%.
  • the alloy is cast in a continuous casting process and then homogenized in the temperature range between 450 and 600 ° C in 1-10h.
  • the extruded profile is subjected to an immediate heat treatment in the temperature range 160-250 ° C for 20-1800min.
  • Table 1 Heat treatment and technological properties for four types of alloys according to the invention and two comparative alloys
  • Table 2 Alloy composition of the alloys according to the invention and of the comparative alloys in% by weight
  • Image 1 Microstructure of a structural component produced according to the invention
  • Picture 2 Microstructure of a structural component according to the prior art
  • Picture 3 Profile cross-section of the examined structural component
  • test numbers I to VI Six different hollow profiles (test numbers I to VI) with the homogenization conditions specified in Table 1 were produced by extrusion and subsequently heat-treated.
  • test numbers III, IV, V and VI showed good deformation and corrosion properties with increased strength and acceptable elongation values.
  • the special properties are based on the fact that the intermetallic phases of the type Mg 2 Si, Al 3 Fe, Al 2 Cu were formed during the heat treatment, so that globulitic particles ⁇ 1 ⁇ were uniformly distributed. This is shown by the micrograph Figure 1 for a hollow profile of the invention produced according to the invention V1 according to Table 2.
  • the hollow profile produced according to the prior art by heat treatment to the state T6 with Mg deficit according to test number I shows a significantly poorer deformation behavior.
  • the reason for this lies in the needle-shaped to plate-shaped structures of the intermetallic compounds, as the micrograph figure 2 shows.

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  • Engineering & Computer Science (AREA)
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  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Extrusion Of Metal (AREA)
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Description

Die Erfindung betrifft ein korrosionsbeständiges Aluminiumstrangpressprofil aus einer ALSiMg-Legierung, vorzugsweise ein Mehrkammerhohlprofil und Verfahren zurThe invention relates to a corrosion-resistant aluminum extruded profile of an ALSiMg alloy, preferably a multi-chamber hollow profile and method for

Herstellung eines Strangpressprofils.Production of an extruded profile.

Stand der Technik:State of the art:

Die Festigkeit bei Aluminium-Knetlegierungen vom Typ AlMgSi (6xxxx-Legierungen) wird im Wesentlichen durch die Legierungsverfestigung eingestellt (D. Altenpohl: "Aluminium von innen betrachtet", Aluminium-Verlag). Dabei wirken Fremdatome oder Ausscheidungen wie Störstellen im Gitter des Al-Gefüges. Bei dem Legierungstyp AlMgSi ist es die intermetallische Verbindung Mg2Si, die festigkeitssteigernd wirkt.The strength of aluminum wrought alloys of the AlMgSi type (6xxxx alloys) is essentially set by the alloying process (D. Altenpohl: "Aluminum viewed from the inside", Aluminum-Verlag). In this case, foreign atoms or precipitates act as impurities in the lattice of the Al microstructure. In the AlMgSi alloy type, it is the Mg 2 Si intermetallic compound which increases strength.

Viele der derzeit in Europa etablierten Al-Mg-Si-Knetlegierungen orientieren sich daher an der Mg2Si-Gleichgewichtsphase, besitzen aber zusätzlich einen Si-Überschuss. Das frei verfügbare Si bewirkt durch die Mischkristallbildung eine weitere Festigkeitssteigerung. Diese ist mit einem Si-Überschuss effektiver als bei einem gleichgroßen Mg-Überschuss ( F. Ostermann: "Anwendungstechnologie Aluminium", Springer-Verlag ).Many of the currently established in Europe Al-Mg-Si wrought alloys are therefore oriented to the Mg 2 Si equilibrium phase, but additionally have an excess of Si. The freely available Si causes by the formation of mixed crystals, a further increase in strength. This is more effective with an Si excess than with an equal Mg excess ( F. Ostermann: "Application Technology Aluminum", Springer-Verlag ).

Ein Si-Überschuss erhöht jedoch die Abschreckempfindlichkeit der Legierung. Weiterhin neigen diese Legierungen zur Bildung von Korngrenzenausscheidungen, die die Duktilität negativ beeinflussen (F. Ostermann: "Anwendungstechnologie Aluminium", Springer-Verlag). Das Si/Mg-Verhältnis besitzt ferner einen Einfluss auf das Verformungsverhalten ( J. Roysted et. al.: "AIMgSi-alloys with improved Crush Properties", Extrusion Technologie 2008, Orlando ). Mit steigendem Si/Mg-Verhältnis bis 1,1 verbessert sich auch das Verformungsverhalten. Zugaben von Cu als Legierungselement erhöhen ebenfalls die Festigkeit, allerdings auf Kosten derHowever, an excess of Si increases the quench sensitivity of the alloy. Furthermore, these alloys tend to form grain boundary precipitates that adversely affect ductility (F. Ostermann: "Application Technology Aluminum", Springer-Verlag). The Si / Mg ratio also has an influence on the deformation behavior ( J. Roysted et. al .: "AIMgSi-alloys with improved Crush Properties", Extrusion Technology 2008, Orlando ). As the Si / Mg ratio increases to 1.1, the deformation behavior also improves. Additions of Cu as an alloying element also increase the strength, but at the expense of

Duktilität ( J. Roysted et. al.: "AIMgSi-alloys with improved Crush Properties", Extrusion Technologie 2008, Orlando ).Ductility ( J. Roysted et. al .: "AIMgSi-alloys with improved Crush Properties", Extrusion Technology 2008, Orlando ).

CA 2 266 193 offenbart eine extrudierbare Aluminium-Legierung bestehend aus 0,60-0,84% Magnesium, 0,45 bis 0,58% Silizium, 0,15 bis 0,40% Kupfer, 0,04 bis 0,35% Chrom, oder 0,20 bis 0,80% Mangan und weniger als 0,25% Eisen, wo Si > = (Mg/1.73 + (Mn + Cr + Fe) /3 bis 0,04). Der Gehalt an Magnesium wurde auf das mögliche Mindestmaß reduziert. CA 2 266 193 discloses an extrudable aluminum alloy consisting of 0.60-0.84% magnesium, 0.45-0.58% silicon, 0.15-0.40% copper, 0.04-0.35% chromium, or 0 , 20 to 0.80% manganese and less than 0.25% iron, where Si> = (Mg / 1.73 + (Mn + Cr + Fe) / 3 to 0.04). The content of magnesium has been reduced to the minimum possible.

M. J. Couper et al. untersuchten in 'Effect of Homogenisation Temperature and Time on Billet Microstructure and Extruded Properties of Alloy 6061' die Effekte unterschiedlicher Homogenisierungsverfahren an der Aluminiumlegierung 6061. Im Rahmen dieser Untersuchungen werden unter anderem die Härte und die Mikrostruktur untersucht. MJ Couper et al. Investigated in 'Effect of Homogenization Temperature and Time on Billet Microstructure and Extruded Properties of Alloy 6061' the effects of different homogenization processes on the aluminum alloy 6061. In the context of these investigations, inter alia, the hardness and the microstructure are investigated.

N.C. Parson et al. untersuchten in The Effect of Heat Treatment on the Microstructure and Properties of 6000 Series Alloy Extrusion Ingots' mikrostrukturelle Veränderungen von Aluminiumlegierungen der Serie 6000 bei unterschiedlichen Homogenisierungsparametern.N.C. Parson et al. investigated Alloy Extrusion Ingots' microstructural alterations of 6000 series aluminum alloys at different homogenization parameters in The Effect of Heat Treatment.

JP 11181539 offenbart eine Al-Mg-Si-Cu-Legierung, welche frei von einer umkristallisierten Struktur in der Oberflächenschicht ist. Die Aluminiumlegierung setzt sich aus 0,8-1,2 Gew.% Mg, 0,4 bis 0,8 Gew.% Si, 0,15 bis 0,4 Gew.% Cu, Al und weiteren Stoffen zusammen. JP 11181539 discloses an Al-Mg-Si-Cu alloy which is free of a recrystallized structure in the surface layer. The aluminum alloy is composed of 0.8-1.2 wt.% Mg, 0.4 to 0.8 wt.% Si, 0.15 to 0.4 wt.% Cu, Al and other substances.

JP 2000282162 offenbart Al-Legierungen der Serie 6000 mit hohem Korrosionsschutz auch in einem aggressiven Umfeld von Cl-Ionen. Die Legierung enthält 0,4 bis 1,2 Gew.% Mg, 0,3 bis 1,4 Gew.% Si, Al, und die durchschnittliche Korngröße in der Oberflächenschicht ist <= 300 µm. Aufgabe der vorliegenden Erfindung war es, ein Strangpressprofil zu erzeugen, mit dem zumindest die bisher bekannten Verformungs- und Korrosionseigenschaften erreicht werden, jedoch bei höheren Festigkeitseigenschaften und zwar Rp 0,2 > 280 MPa, Rm ≥ 300 MPa und A ≥ 10%. JP 2000282162 discloses 6000 series Al alloys with high corrosion protection even in an aggressive environment of Cl ions. The alloy contains 0.4 to 1.2 wt% Mg, 0.3 to 1.4 wt% Si, Al, and the average grain size in the surface layer is <= 300 μm. The object of the present invention was to produce an extruded profile, with which at least the previously known deformation and corrosion properties are achieved, but with higher strength properties, namely Rp 0.2> 280 MPa, Rm ≥ 300 MPa and A ≥ 10%.

Die Aufgabe wird erfindungsgemäß gelöst durch ein Strangpressprofil aus der Aluminiumlegierung:

Si
0,30 - 0,60%
Mg
0,8-1,2%
Mn
0,05-0,10%
Fe
0,1-0,3%
Cu
0,1-0,3%
Ti
0,01 - 0,12%
The object is achieved by an extruded profile of the aluminum alloy:
Si
0.30 - 0.60%
mg
0.8-1.2%
Mn
0.05-0.10%
Fe
0.1-0.3%
Cu
0.1-0.3%
Ti
0.01 - 0.12%

Rest Reinaluminium mit den üblichen Verunreinigungen, dem wahlweise ein Gehalt an Cr 0,01-0,12% zugesetzt werden kann.The balance pure aluminum with the usual impurities, which can optionally be added to a content of Cr 0.01-0.12%.

Das erfindungsgemäße Strangpressprofil weist ferner eine Gefügestruktur mit eingeformten intermetallischen Phasen des Typs alpha-AlFeSi, beta-AlFeSi, Al15FeMn3Si2, Mg2Si, theta-AlCu auf, wobei die Partikel aus intermetallischen Phasen globulitisch geformt sind und einen Durchmesser ≤ 1 µm aufweisen.The extruded profile according to the invention also has a microstructure with molded intermetallic phases of the type alpha-AlFeSi, beta-AlFeSi, Al15FeMn3Si2, Mg2Si, theta-AlCu, the particles of intermetallic phases being globulitically shaped and having a diameter ≦ 1 μm.

Vorzugsweise beträgt der H2-Gehalt der Schmelze <=0,15ccm/100gr. Al. Der H2-Gehalt der Schmelze wird in üblicher Weise durch Chlorieren, durch Stickstoff- oder Argon-Spülbehandlung eingestellt.Preferably, the H 2 content of the melt is <= 0.15 ccm / 100gr. Al. The H 2 content of the melt is adjusted in the usual way by chlorination, by nitrogen or argon rinsing treatment.

Die Legierung zeichnet sich durch einen Mg-Überschuss aus, wobei das bevorzugte Gew-Verhältnis von Magnesium zu Silizium in der Legierungszusammensetzung im Bereich von 1 bis 2 bei einem Legierungsgehalt von Si 0,30 - 0,60% liegt.The alloy is characterized by an excess of Mg, with the preferred weight ratio of magnesium to silicon in the alloy composition ranging from 1 to 2 at an alloy content of Si 0.30-0.60%.

Neuere Untersuchungen zeigen, dass mit einem Mg/Si-Verhältnis von nahezu 1 gute Festigkeitsergebnisse erzielt werden können, wobei eine Steigerung der Produktivität dieser Legierungen z.B. durch höhere Pressgeschwindigkeit, niedrigerem Anpressdruck und besserer Oberflächenqualität besonders herausgestellt wird (Comalco Aluminium Ltd.: "6xxx series aluminium alloys", EP 1 840 234 A1 ).Recent studies show that with a Mg / Si ratio of nearly 1 good strength results can be achieved, with an increase in productivity of these alloys is particularly emphasized eg by higher pressing speed, lower contact pressure and better surface quality (Comalco Aluminum Ltd .: "6xxx series aluminum alloys", EP 1 840 234 A1 ).

Allerdings lassen sich die Verformungseigenschaften und die Duktivität wesentlich verbessern, wenn die Gehalte an Mn, Fe, Cu sowie ggf. Ti und Cr deutlich eingeschränkt werden (siehe Anspruch 1).However, the deformation properties and the ductility can be significantly improved if the contents of Mn, Fe, Cu and optionally Ti and Cr are significantly limited (see claim 1).

Es wurde beobachtet, dass Zusätze von Mn und Cr während der Homogenisierung Dispersoide bilden, die eine Rekristallisation des Gefüges verhindern können. Diese Dispersoide verringern die lokalen Spannungen im Gefüge und erhöhen dabei die Duktilität. Der optimale Gehalt für Mn liegt dabei zwischen 0,05 und 0,10 und bei Cr zwischen 0,01 und 0,12 %.It has been observed that additions of Mn and Cr during homogenization form dispersoids which can prevent recrystallization of the microstructure. These dispersoids reduce the local stresses in the structure and thereby increase the ductility. The optimum content for Mn is between 0.05 and 0.10 and for Cr between 0.01 and 0.12%.

Titan erhöht auch die Duktilität, wobei der Gehalt zwischen 0,01 - 0,12 % liegt.Titanium also increases ductility, with the content being between 0.01-0.12%.

Die Legierung wird im Stranggussverfahren vergossen und anschließend homogenisiert im Temperaturbereich zwischen 450 und 600°C in 1-10h. Das Strangpressprofil wird einer sofortigen Wärmebehandlung im Temperaturbereich 160-250°C für 20-1800min unterzogen.The alloy is cast in a continuous casting process and then homogenized in the temperature range between 450 and 600 ° C in 1-10h. The extruded profile is subjected to an immediate heat treatment in the temperature range 160-250 ° C for 20-1800min.

Im Folgenden wird die Erfindung anhand mehrerer Ausführungsbeispiele näher erläutert.In the following the invention will be explained in more detail with reference to several embodiments.

Es zeigen: Tabelle 1: Wärmebehandlung und technologische Eigenschaften bei vier Legierungstypen nach der Erfindung und zwei Vergleichslegierungen Tabelle 2: Legierungszusammensetzung der erfindungsgemäßen Legierungen und der Vergleichslegierungen in Gew. % Bild 1: Gefügeaufnahme eines erfindungsgemäß hergestellten Strukturbauteils Bild 2: Gefügeaufnahme eines Strukturbauteils nach dem Stand der Technik Bild 3: Profilquerschnitt des untersuchten Strukturbauteils Show it: Table 1: Heat treatment and technological properties for four types of alloys according to the invention and two comparative alloys Table 2: Alloy composition of the alloys according to the invention and of the comparative alloys in% by weight Image 1: Microstructure of a structural component produced according to the invention Picture 2: Microstructure of a structural component according to the prior art Picture 3: Profile cross-section of the examined structural component

Es wurden sechs verschiedene Hohlprofile (Versuchsnummer I bis VI) mit den in Tabelle 1 angegebenen Homogenisierungsbedingungen durch Strangpressen hergestellt und anschließend wärmebehandelt.Six different hollow profiles (test numbers I to VI) with the homogenization conditions specified in Table 1 were produced by extrusion and subsequently heat-treated.

Die technologischen Eigenschaften wurden an Probenstäben gemessen und in Tabelle 1 aufgelistet.The technological properties were measured on specimen rods and listed in Table 1.

Die erfindungsgemäßen Hohlprofile (Versuchsnummern III, IV, V und VI) zeigten gute Verformungs- und Korrosionseigenschaften bei erhöhter Festigkeit und akzeptablen Dehnungswerten.The hollow sections according to the invention (test numbers III, IV, V and VI) showed good deformation and corrosion properties with increased strength and acceptable elongation values.

Die besonderen Eigenschaften beruhen darauf, dass während der Wärmebehandlung die intermetallischen Phasen des Typs Mg2Si, Al3Fe, Al2Cu eingeformt wurden, so dass globulitisch geformte Partikel ≤ 1µ in gleichmäßiger Verteilung vorlagen. Dies zeigt die Gefügeaufnahme Bild 1 für ein erfindungsgemäß hergestelltes Hohlprofil der Legierung V1 gemäß Tabelle 2.The special properties are based on the fact that the intermetallic phases of the type Mg 2 Si, Al 3 Fe, Al 2 Cu were formed during the heat treatment, so that globulitic particles ≤ 1μ were uniformly distributed. This is shown by the micrograph Figure 1 for a hollow profile of the invention produced according to the invention V1 according to Table 2.

Im Vergleich dazu wurde ein Hohlprofil nach dem Stand der Technik hergestellt, wobei die Legierung B1 einen Mg-Unterschuss aufwies. Die genaue Zusammensetzung der Legierungsbeispiele ist Tabelle 2 zu entnehmen.In comparison, a hollow profile according to the prior art was produced, wherein the alloy B1 had a Mg deficit. The exact composition of the alloy examples is shown in Table 2.

Das nach dem Stand der Technik durch Wärmebehandlung auf den Zustand T6 hergestellte Hohlprofil mit Mg-Unterschuss nach Versuchsnummer I zeigt ein deutlich schlechteres Verformungsverhalten. Die Ursache hierfür liegt in den nadelförmigen bis plattenförmigen Strukturen der intermetallischen Verbindungen, wie die Gefügeaufnahme Bild 2 erkennen lässt.The hollow profile produced according to the prior art by heat treatment to the state T6 with Mg deficit according to test number I shows a significantly poorer deformation behavior. The reason for this lies in the needle-shaped to plate-shaped structures of the intermetallic compounds, as the micrograph figure 2 shows.

Zusammenfassend lässt sich feststellen, dass nur durch die Kombination der erfindungsgemäßen Legierungsvarianten V1 - V4 mit den Verfahrensmaßnahmen gemäß Patentanspruch 4, die Lösung der vorliegenden Aufgabenstellung möglich ist. Wie die Versuchsauswertung zeigt, ist es gelungen, die Zugfestigkeiten oberhalb von 300 MPa einzustellen. Dies ist in erster Linie durch entsprechende Gehalte an den Legierungselementen Si, Mg und Cu zu erklären. Mit steigendem Si- und Mg-Gehalt verschlechtert sich das Verformungsverhalten. Durch die Zugabe von Cu und der Temperaturführung während des Fertigungsprozesses konnte gutes Stauchverhalten des Materials beibehalten werden. Tabelle 1: Wärmebehandlung und technologische Eigenschaften Hohlprofil Versuchs Nr. Legierung HO Wärmebehandlung Rm* [MPa] Rp0,2 [MPa] A [%] Stauchverhalten** Korrosionsverhalten*** I B1 **** **** 260 220 11 10 i.O. II C1 580°C/3h 190°C/340min 280 270 14 10 i.O. III Leg. V1 580°C/3h 160°C/1700min 318 286 14 6 i.O. IV Leg. V2 560°C/10h 160°C/1700min 322 290 16 6 i.O. V Leg. V3 580°C/3h 240°C/190min 320 290 12 9 i.O. VI Leg. V4 560°C/10h 240°C/190min 310 305 10 9 i.O. * Technologische Eigenschaften gemessen an Probenstäben entnommen aus Mehrkammerhohlprofilen gemäß Bild 4.
** Bewertung 1 bis 10 des Stauchverhaltens nach J. Roysted et. al.: "AlMgSi-alloys with improved Crush Properties", Extrusion Technologie 2008, Orlando .
1 : starke Rissbildung, Abfallen einzelner Profilteile
10: keine Risse, keine Orangenhaut
*** Korrosionstest analog zu DIN 50 905 (Prüfvorschrift nach Fa.Honsel)
**** wärmebehandelt auf den Zustand T6 Tabelle 2: Legierungszusammensetzung in Gew.% Si Mg Mn Fe Cu Ti Cr B1 0,57 0,39 0,15 0,20 - 0,01 - C1 0,48 0,47 0,03 0,19 0,20 0,013 - Leg. V1 0,41 0,86 0,07 0,22 0,16 0,016 0,015 Leg. V2 0,48 0,81 0,06 0,27 0,22 0,015 - Leg. V3 0,51 0,85 0,09 0,12 0,18 0,014 - Leg. V4 0,45 0,84 0,07 0,21 0,24 0,06 - In summary, it can be stated that only by combining the inventive alloy variants V1-V4 with the method measures according to claim 4, the solution of the present task is possible. As the test evaluation shows, it has been possible to set the tensile strengths above 300 MPa. This can be explained primarily by corresponding contents of the alloying elements Si, Mg and Cu. With increasing Si and Mg content, the deformation behavior deteriorates. Through the addition of Cu and the temperature control during the manufacturing process, good compression behavior of the material could be maintained. Table 1: Heat treatment and technological properties Hollow profile experiment no. alloy HO heat treatment Rm * [MPa] Rp0.2 [MPa] A [%] Crushing performance ** Corrosion behavior *** I B1 **** **** 260 220 11 10 iO II C1 580 ° C / 3h 190 ° C / 340min 280 270 14 10 iO III Leg. V1 580 ° C / 3h 160 ° C / 1700min 318 286 14 6 iO IV Leg. V2 560 ° C / 10h 160 ° C / 1700min 322 290 16 6 iO V Leg. V3 580 ° C / 3h 240 ° C / 190min 320 290 12 9 iO VI Leg. V4 560 ° C / 10h 240 ° C / 190min 310 305 10 9 iO * Technological properties measured on specimen rods taken from multi-chamber hollow profiles according to Fig. 4.
** Rating 1 to 10 of the compression behavior after J. Roysted et. al .: "AlMgSi-alloys with improved Crush Properties", Extrusion Technology 2008, Orlando ,
1: severe cracking, falling off of individual profile parts
10: no cracks, no orange peel
*** Corrosion test analogous to DIN 50 905 (test specification according to the company Honsel)
**** heat treated to the state T6 Si mg Mn Fe Cu Ti Cr B1 0.57 0.39 0.15 0.20 - 0.01 - C1 0.48 0.47 0.03 0.19 0.20 0,013 - Leg. V1 0.41 0.86 0.07 0.22 0.16 0.016 0,015 Leg. V2 0.48 0.81 0.06 0.27 0.22 0,015 - Leg. V3 0.51 0.85 0.09 0.12 0.18 0,014 - Leg. V4 0.45 0.84 0.07 0.21 0.24 0.06 -

Überraschender Weise zeigten die nach dem erfindungsgemäßen Verfahren hergestellten Strukturbauteile eine Verbesserung der Kerbschlagzähigkeit. Dies wurde insbesondere an den Legierungen der Versuchs-Nr. V und VI festgestellt, deren Ergebnisse bei den Kerbschlagversuchen um mehr als 10% über den Vergleichswerten der Versuche III. und IV. und um mehr als 20% über den Werten der Versuche I. und II. lagen.Surprisingly, the structural components produced by the process according to the invention showed an improvement in notched impact strength. This was especially true of the alloys of the experiment no. V and VI whose results in the notched-bar impact tests exceeded by more than 10% the comparison values of tests III. and IV. and more than 20% above the values of Experiments I. and II.

Claims (6)

  1. Corrosion-resistant extruded section of an AlSiMg alloy, preferably a multi-chamber hollow section, characterized by the following alloy composition, in % by weight
    Si 0.30 - 0,60%
    Mg 0.8 - 1.2%
    Mn 0.05 - 0.10%
    Fe 0.1 - 0.3%
    Cu 0.1 - 0.3%
    and
    Ti 0.01 - 0.12% and, optionally,
    Cr 0.01 - 0.12%;
    balance pure aluminium containing the impurities conditional to manufacturing;
    the said extruded section furthermore having a microstructure with globulized intermetallic phases of the alpha-AlFeSi, beta-AlFeSi, Al15FeMn3Si2, Mg2Si, theta-AlCu type, and the particles of the intermetallic phases having a globulitic shape and a cross-section of ≤1 µm.
  2. The extruded section according to claim 1, characterized by
    Si 0.40 - 0,60%
    Mg 0.82 - 0.90%
    Cu 0.15 - 0.25%.
  3. The extruded section according to any one of the preceding claims, characterized in that the weight ratio of magnesium to silicon in the alloy composition is in the range from 1 to 2.
  4. Method for producing an extruded section according to any one of the preceding claims by continuous casting, homogenising and a heat treatment immediately following the extrusion, characterised in that an alloy according to the preceding claims is produced, and the homogenisation is performed between 450 °C and 600 °C for 1 to 10 hours, and that then, immediately following the extrusion, a heat treatment in the range from 160 °C to 260 °C is carried out for 20 to 1800 minutes.
  5. The method according to claim 4, characterized in that the heat treatment which follows the extrusion is carried out at a temperature of 180 °C to 250 °C for 100 to 1000 minutes.
  6. The method according to claim 4 or 5, characterized in that, prior to extrusion, the melt has an H2 content of <0.15 cm3/100 g Al.
EP20090011984 2008-09-22 2009-09-21 Corrosion-resistant aluminium extrusion profile and method for manufacturing a structure component Active EP2175042B1 (en)

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PL3339457T3 (en) 2012-04-25 2020-12-14 Norsk Hydro Asa Extruded al-mg-si aluminium alloy profile with improved properties
CA2817425C (en) 2012-05-31 2020-07-21 Rio Tinto Alcan International Limited Aluminium alloy combining high strength, elongation and extrudability
CN103060634A (en) * 2012-12-31 2013-04-24 张家港市金邦铝业有限公司 Light high-strength aluminum ladder section
US11345980B2 (en) 2018-08-09 2022-05-31 Apple Inc. Recycled aluminum alloys from manufacturing scrap with cosmetic appeal
KR102578561B1 (en) 2019-03-13 2023-09-15 노벨리스 인크. Age-hardenable and highly formable aluminum alloys, monolithic sheets made therefrom and clad aluminum alloy products containing them
CN118006983A (en) * 2022-11-09 2024-05-10 北京车和家汽车科技有限公司 Aluminum alloy material and preparation method and application thereof

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