EP0716716B2 - Extrudiertes Profil aus einer AL-Mg-Si Legierung - Google Patents

Extrudiertes Profil aus einer AL-Mg-Si Legierung Download PDF

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Publication number
EP0716716B2
EP0716716B2 EP94924943A EP94924943A EP0716716B2 EP 0716716 B2 EP0716716 B2 EP 0716716B2 EP 94924943 A EP94924943 A EP 94924943A EP 94924943 A EP94924943 A EP 94924943A EP 0716716 B2 EP0716716 B2 EP 0716716B2
Authority
EP
European Patent Office
Prior art keywords
alloys
alloy
extrusion
extruded
composition
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
Application number
EP94924943A
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English (en)
French (fr)
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EP0716716B1 (de
EP0716716A1 (de
Inventor
Hang Lam Yiu
Ricky Arthur Ricks
Stephen Anthony Court
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rio Tinto Alcan International Ltd
Original Assignee
Alcan International Ltd Canada
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Publication date
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Application filed by Alcan International Ltd Canada filed Critical Alcan International Ltd Canada
Publication of EP0716716A1 publication Critical patent/EP0716716A1/de
Publication of EP0716716B1 publication Critical patent/EP0716716B1/de
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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

Definitions

  • This invention concerns intermediate strength extrudable Al-Mg-Si alloys, in the 6000 series of the Aluminum Association Register.
  • the dilute Al-Mg-Si alloys with levels of the two primary alloying additions at less than approximately 0.50 wt.%, are used extensively in extruded form in many market sectors, including architectural (doors, window frames, etc.) and structural applications.
  • These alloys generally lie within the AA6063 specification, which has compositional limits for Mg and Si of 0.45 to 0.90wt.% and 0.20 to 0.60 wt.% respectively.
  • These alloys are capable of producing complex sections which are readily air quenchable off the press and which may be extruded at high exit speeds whilst maintaining a very high quality surface finish; attributes which are associated with high extrudability.
  • EP 480 402 (A1) teaches a process for manufacturing an aluminium alloy material which has excellent formability in press working, shape fixability and bake hardenability.
  • the alloys contain in weight %: Mg 0.3 - 0.5, Si 0.4 - 1.5 and optionally Cu, Mn, Cr or V.
  • the invention provides an extruded section of the following composition in weight % in which Fe is present as ⁇ -AlFeSi Mg 0.25 - 0.40 Si 0.60 - 0.90 Mn 0.10-0.35 Fe up to 0.35 Others up to 0.05 each, 0.15 total Al balance wherein the extruded section has after aging an ultimate tensile strength of at least 240 MPa.
  • Figure 1 of the accompanying drawings is a compositional plot showing the Mg and Si specification ranges for various alloys in the Aluminum Association specification.
  • the filled circle shows the nominal composition d alloys according to the present invention, and the rectangle round it corresponds to the above definition. It can be seen that the above defined alloy composition does not overlap with any of the AA designated alloys shown.
  • the alloys are high excess Si alloys.
  • the nominal composition of these alloys (marked by the filled circle in Figure 1) is set out in the table below, together with the nominal compositions of AA6106 which is an excess Si alloy, and of AA6063A which is a balanced alloy.
  • An alloy of balanced composition is one in which just enough Si is present to combine with all the Mg, Fe, Mn as Mg 2 Si and Al(Fe,Mn)Si.
  • Nominal Composition Alloy Si Mg Fe Invention 0.70 0.35 0.2 AA6106 0.6 0.5 0.2 AA6063A 0.5 0.63 0.2
  • the alloys have a number of advantages. It should be understood that not all the stated advantages are necessarily achieved by all the alloys. Also, a particular property may not be an improvement on some other alloy. But most of the advantages are possessed by most alloys according to the invention, and it is this combination that represents a significant advance in the art:
  • the Mg content of the invention alloy is set at 0.25 - 0.40%. If the Mg content is too low, it is difficult to achieve the required strength in the aged extrusions. Extrusion pressure increases with Mg content, and becomes unacceptable at high Mg contents.
  • the Si content is set at 0.6 - 0.9%. If the Si content is too low, the alloy strength is adversely affected, while if the Si content is too high, extrudability may be reduced.
  • the function of the Si is to strengthen the alloy without adversely affecting extrudability, high temperature flow stress, or anodising and corrosion characteristics.
  • Fe is not a desired component of the alloy, but its presence is normally unavoidable.
  • An upper concentration limit is set at 0.35%, and a preferred range at 0.15 - 0.35% (because alloys containing less Fe are more expensive).
  • Fe is present in the form of large plate-like ⁇ -AlFeSi particles.
  • the extrusion ingot is homogenised to convert ⁇ -AlFeSi to the ⁇ -AlFeSi form. It is known however that excess Si (over the amount required to form Mg 2 Si) stabilises the ⁇ -AlFeSi phase, which has a detrimental effect on extrudability and in particular on extrusion surface quality. Where extrusion surface quality is important, this problem may be avoided by homogenising the extrusion ingot under special conditions or by modifying the alloy composition.
  • Mn is included in the alloys in order to improve extrusion surface quality.
  • Mn acts to accelerate the ⁇ to ⁇ -AlFeSi transformation during homogenisation, so that the resulting homogenised ingot has improved extrudability, that is to say improved extrusion surface quality. Above 0.35% Mn, further improvements are not seen, or are not commensurate with the added cost, and the extrudates may show increased quench sensitivity.
  • a preferred Mn content is 0.10 - 0.25%.
  • the Si is present as Mg 2 Si and some more is present as AlFeSi.
  • the excess Si over the amount required to combine with all the Mg and Fe present, is at least 0.3%.
  • An extrusion ingot of the alloy may be made by any convenient casting technique, e.g. by a DC casting process preferably by means of a short mould or hot-top DC process.
  • the Fe is preferably present as an insoluble secondary phase in the form of fine ⁇ -AlFeSi platelets preferably not more than 15 ⁇ m in length or, if in the ⁇ form, free from script and coarse eutectic particles.
  • the as-cast extrusion ingot is homogenised, partly to bring the soluble secondary magnesium-silicon phases into suitable form, and partly to convert ⁇ -AlFeSi particles into ⁇ -AlFeSi particles, preferably below 15 ⁇ m long and with 90% below 6 ⁇ m long.
  • Homogenisation typically involves heating the ingot at 550 - 600°C for 30 minutes to 24 hours, with higher temperatures requiring shorter hold times. As noted above, optimum homogenisation conditions may depend on the presence and concentration of added Mn.
  • the homogenised extrusion ingot is hot extruded, under conditions which may be conventional.
  • the emerging extrusion is quenched, either by water or forced air or more preferably in still air, and subjected to an ageing process in order to develop desired strength and toughness properties.
  • Ageing typically involves heating the extrusion to an elevated temperature in the range 150 - 200°C, and holding at that temperature for 1 - 48 hours, with higher temperatures requiring shorter hold times.
  • a surprising feature of this invention is that the response of the extrusion to this ageing process depends significantly on the rate of heating.
  • a rate of heating is from 10 - 100°C, particularly 10 - 70°C, per hour; if the heating rate is too slow, low throughput results in increased costs; if the heating rate is too high, the mechanical properties developed are less than optimum.
  • An effect equivalent to slow heating can be achieved by a two-stage heating schedule, with a hold temperature typically in the range of 80 - 140°C, for a time sufficient to give an overall heating rate within the above range.
  • extrusions When aged to peak strength, extrusions are typically found to have an ultimate tensile strength of at least 240 MPa, often greater than 250 MPa, with acceptable toughness.
  • Extrusion ingots were DC cast and were homogenised for 2 hours at 570°C or 580°C. They were then hot extruded.
  • the expermented alloy has properties equivalent to the AA6063A alloy, and their tensile strength well in excess of 250 MPa with acceptable toughness.

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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)
  • Extrusion Of Metal (AREA)
  • Powder Metallurgy (AREA)
  • Glass Compositions (AREA)

Claims (3)

  1. Extrudiertes Teilstück der folgenden Zusammensetzung in Gew.%, in dem Fe als α-AlFeSi vorliegt: Mg 0,25 bis 0,40 Si 0,60 bis 0,90 Mn 0,10 bis 0,35 Fe bis zu 0,35 Andere bis zu jeweils 0,05, insgesamt 0,15 Al Rest
    wobei das extrudierte Teilstück nach dem Härten eine Reissfestigkeit von mindestens 240 MPa aufweist.
  2. Extrudiertes Teilstück gemäss Anspruch 1, umfassend: Fe 0,15 bis 0,35 Mn 0,10 bis 0,25
  3. Extrudiertes Teilstück, das durch Extrudieren einer Extrusionslegierung der Zusammensetzung, in Gew.%, Mg 0,25 bis 0,40 Si. 0,60 bis 0,90 Mn 0,10 bis 0,35 Fe bis zu 0,35 Andere bis zu jeweils 0,05, insgesamt 0,15 Al Rest
    hergestellt wird, wobei das extrudierte Teilstück nach dem Härten eine Reissfestigkeit von mindestens 240 MPa aufweist.
EP94924943A 1993-08-31 1994-08-30 Extrudiertes Profil aus einer AL-Mg-Si Legierung Expired - Lifetime EP0716716B2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB939318041A GB9318041D0 (en) 1993-08-31 1993-08-31 Extrudable a1-mg-si alloys
GB9318041 1993-08-31
PCT/GB1994/001880 WO1995006759A1 (en) 1993-08-31 1994-08-30 EXTRUDABLE Al-Mg-Si ALLOYS

Publications (3)

Publication Number Publication Date
EP0716716A1 EP0716716A1 (de) 1996-06-19
EP0716716B1 EP0716716B1 (de) 1998-08-12
EP0716716B2 true EP0716716B2 (de) 2004-12-29

Family

ID=10741279

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94924943A Expired - Lifetime EP0716716B2 (de) 1993-08-31 1994-08-30 Extrudiertes Profil aus einer AL-Mg-Si Legierung

Country Status (12)

Country Link
US (1) US20090047172A1 (de)
EP (1) EP0716716B2 (de)
JP (1) JPH09501987A (de)
AT (1) ATE169689T1 (de)
AU (1) AU680679B2 (de)
BR (1) BR9407462A (de)
CA (1) CA2169968C (de)
DE (1) DE69412491T3 (de)
GB (1) GB9318041D0 (de)
NO (1) NO960808L (de)
NZ (1) NZ271423A (de)
WO (1) WO1995006759A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998042884A1 (en) * 1997-03-21 1998-10-01 Alcan International Limited Al-Mg-Si ALLOY WITH GOOD EXTRUSION PROPERTIES
ATE208835T1 (de) 1997-03-21 2001-11-15 Alcan Int Ltd Al-mg-si legierung mit guten strangpresseigenschaften
EP1155161B1 (de) * 1999-02-12 2003-08-13 Norsk Hydro Asa Verfahren zur herstellung einer aluminiumlegierung, die silicium und magnesium enthält
US6602364B1 (en) * 1999-02-12 2003-08-05 Norsk Hydro A.S. Aluminium alloy containing magnesium and silicon
BG65068B1 (bg) * 2001-08-09 2007-01-31 Norsk Hydro Asa Метод за обработване на алуминиева сплав, съдържаща магнезий и силиций
NO20034731D0 (no) * 2003-10-22 2003-10-22 Norsk Hydro As Aluminiumslegering
WO2006056481A1 (en) * 2004-11-25 2006-06-01 Corus Aluminium Nv Aluminium alloy sheet for automotive applications
JP5153659B2 (ja) * 2009-01-09 2013-02-27 ノルスク・ヒドロ・アーエスアー マグネシウム及びケイ素を含有するアルミニウム合金の処理方法

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1333327A (en) * 1971-05-25 1973-10-10 Alcan Res & Dev Aluminium alloys
GB1430758A (en) * 1972-08-23 1976-04-07 Alcan Res & Dev Aluminium alloys
JPS6049707B2 (ja) * 1977-08-16 1985-11-05 住友アルミニウム製錬株式会社 薄肉押出形材の製造方法
US4256488A (en) * 1979-09-27 1981-03-17 Swiss Aluminium Ltd. Al-Mg-Si Extrusion alloy
DE3243371A1 (de) * 1982-09-13 1984-03-15 Schweizerische Aluminium AG, 3965 Chippis Aluminiumlegierung
JPS61136650A (ja) * 1984-12-05 1986-06-24 Sumitomo Alum Smelt Co Ltd 押出性、曲げ加工性の優れた中強度アルミニウム合金
US4729939A (en) * 1985-07-25 1988-03-08 Nippon Light Metal Company Limited Aluminum alloy support for lithographic printing plates
US5223050A (en) * 1985-09-30 1993-06-29 Alcan International Limited Al-Mg-Si extrusion alloy
GB8524077D0 (en) * 1985-09-30 1985-11-06 Alcan Int Ltd Al-mg-si extrusion alloy
US4808247A (en) * 1986-02-21 1989-02-28 Sky Aluminium Co., Ltd. Production process for aluminum-alloy rolled sheet
FR2601040B1 (fr) * 1986-07-07 1988-09-02 Cegedur Alliage d'aluminium chaudronnable et soudable et son procede de fabrication
BE906107A (fr) * 1986-12-30 1987-04-16 Alusuisse Alliage a base d'aluminium.
EP0480402B1 (de) * 1990-10-09 1995-02-15 Sumitomo Light Metal Industries Limited Verfahren zur Herstellung eines Werkstoffes aus eines Aluminiumlegierung mit ausgezeichneter Pressverformbarkeit und Einbrennhärtbarkeit
JPH07197219A (ja) * 1993-12-28 1995-08-01 Furukawa Electric Co Ltd:The 成形用アルミニウム合金板材の製造方法
US5571347A (en) * 1994-04-07 1996-11-05 Northwest Aluminum Company High strength MG-SI type aluminum alloy
US5525169A (en) * 1994-05-11 1996-06-11 Aluminum Company Of America Corrosion resistant aluminum alloy rolled sheet
ATE208835T1 (de) * 1997-03-21 2001-11-15 Alcan Int Ltd Al-mg-si legierung mit guten strangpresseigenschaften

Also Published As

Publication number Publication date
ATE169689T1 (de) 1998-08-15
DE69412491D1 (de) 1998-09-17
BR9407462A (pt) 1996-11-12
GB9318041D0 (en) 1993-10-20
EP0716716B1 (de) 1998-08-12
DE69412491T3 (de) 2005-07-07
NO960808D0 (no) 1996-02-28
AU7504694A (en) 1995-03-22
NO960808L (no) 1996-02-28
EP0716716A1 (de) 1996-06-19
JPH09501987A (ja) 1997-02-25
CA2169968C (en) 2006-08-29
AU680679B2 (en) 1997-08-07
CA2169968A1 (en) 1995-03-09
WO1995006759A1 (en) 1995-03-09
NZ271423A (en) 1997-11-24
US20090047172A1 (en) 2009-02-19
DE69412491T2 (de) 1998-12-24

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