WO1995006759A1 - ALLIAGES DE Al-Mg-Si SUSCEPTIBLES D'ETRE EXTRUDES - Google Patents

ALLIAGES DE Al-Mg-Si SUSCEPTIBLES D'ETRE EXTRUDES Download PDF

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Publication number
WO1995006759A1
WO1995006759A1 PCT/GB1994/001880 GB9401880W WO9506759A1 WO 1995006759 A1 WO1995006759 A1 WO 1995006759A1 GB 9401880 W GB9401880 W GB 9401880W WO 9506759 A1 WO9506759 A1 WO 9506759A1
Authority
WO
WIPO (PCT)
Prior art keywords
alloy
alloys
extrusion
composition
ageing
Prior art date
Application number
PCT/GB1994/001880
Other languages
English (en)
Inventor
Hang Lam Yiu
Ricky Arthur Ricks
Stephen Anthony Court
Original Assignee
Alcan International Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10741279&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1995006759(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Alcan International Limited filed Critical Alcan International Limited
Priority to CA002169968A priority Critical patent/CA2169968C/fr
Priority to EP94924943A priority patent/EP0716716B2/fr
Priority to DE69412491T priority patent/DE69412491T3/de
Priority to AU75046/94A priority patent/AU680679B2/en
Priority to JP7508000A priority patent/JPH09501987A/ja
Priority to BR9407462A priority patent/BR9407462A/pt
Priority to NZ271423A priority patent/NZ271423A/en
Publication of WO1995006759A1 publication Critical patent/WO1995006759A1/fr
Priority to NO960808A priority patent/NO960808L/no
Priority to US12/288,022 priority patent/US20090047172A1/en

Links

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 5 has compositional limits for Mg and Si of 0.45 to
  • 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 0 very high quality surface finish; attributes which are associated with high extrudability.
  • this invention is concerned with alloys of composition in weight % Mg 0.25 - 0.40 5 Si 0.60 - 0.90
  • the alloys of the present invention 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.
  • the alloys of this invention 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:
  • Extrusion ingots of the alloys are capable of being extruded at relatively high speeds, typically around 75% of the maximum extrusion speed of AA6063 alloys.
  • the extrusion pressures required are lower than for AA6063 alloys, which reduces equipment and operating costs.
  • the extrusions are air quenchable. - The extrusions have a surface quality which is acceptable for most architectural applications.
  • the surface quality of the extrusions can be made to be better than for any related alloy compositions.
  • the extrusions are capable of being aged to a tensile strength in excess of 240 MPa, often in excess of 250 MPa, with acceptable toughness.
  • a two-stage or ramped ageing process is particularly effective in improving aged properties.
  • 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.
  • Any Mn addition is beneficial in this way and improvements may be seen with additions as low as 0.05% or 0.07%. 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 of the invention 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 a 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 preferred 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.
  • Figure 1 is a compositional plot showing the Aluminum Association specification ranges for Mg and Si for various alloys alongside the alloys of the present invention (the blank rectangle containing the filled circle) .
  • Figure 2 is a bar diagram showing the effect of alloy composition and homogenisation temperature on the maximum extrusion pressure of 250 MPa target alloys extruded into a 5 x 20 mm section.
  • Figure 3 is a bar diagram showing the effect of alloy composition and homogenisation temperature on the surface roughness measurement of 250 MPa target alloys extruded into a 5 x 20 mm section.
  • Figure 4 is a bar diagram showing the effect of alloy composition and homogenisation temperature on 20° gloss (reflectivity) measurement of 250 MPa target alloys extruded into 5 x 20 mm section.
  • Figure 5 is a bar diagram showing the effect of alloy composition on the mechanical properties of 250 MPa target alloys, which had been homogenised for 2 hours at 580'C, extruded into a 5 x 20 mm section, forced air quenched, and aged for 7 hours at 175'C. The properties were measured at the back of the extrusion.
  • Figure 6 is a graph showing the effect of ramp rate to the ageing temperature (5 hours at 185'C) on the tensile strength of two dilute 6000 series alloys, including a very high excess Si alloy containing no Mn and having a composition within the scope of the present invention.
  • Figure 7 is a bar diagram showing surface roughness of the alloys extruded in Example 4.
  • Figure 8 is a bar diagram showing tensile properties of the alloys extruded in Example 4.
  • the invention has been tested in the laboratory. Extrusion trials were carried out using an experimental extrusion press, in which the alloys given in Table 1 below were extruded. These alloys represent a low Mg-containing alloy of the invention, with and without an addition of 0.12% Mn, together with typical AA6063 and AA6106 compositions, again with and without an addition of about 0.12% Mn.
  • the nominal alloy composition of the invention is shown as a filled circle in the compositional plot of Figure 1.
  • Extrusion ingots were DC cast and were homogenised for 2 hours at 570'C or 580'C. They were then hot extruded. Extrusion pressure was recorded, and maximum extrusion pressure data for the alloys are given in Figure 2. Thus, this data shows that the extrusion pressure of the alloy type of the invention is significantly lower than that of the AA6106 and AA6063A alloys. The addition of Mn to the base composition may reduce the extrusion pressure still further, but is found to be dependent upon the precise homogenisation conditions used (see Figure 2) .
  • 0.19Fe-0.08Mn was evaluated in extrusion trials.
  • This alloy showed reduced extrudability as compared with "conventional” AA6060 alloys, but the maximum attainable extrusion speed was still relatively high (up to «80 m/min) in comparison with AA6063 alloys.
  • the application of two stage ageing practice to extrudate of this alloy showed that the tensile properties could be improved significantly as compared with material aged "conventionally” (see Table 2) .
  • Very high excess Si alloy 0.35 Mg - 0.70 Si - 0.20 Fe.
  • the invention has been tested on a commercial scale. Extrusion trials were carried out using 180 mm diameter billets. The compositions of the trial alloys are given in Table 3. Surface quality of the extrusions is shown in Figure 7. The experimental alloy of the invention gives a "less rough" surface than either of the other two alloys. Tensile properties of the extrusions, after ageing to peak strength, are set out in Figure 8. The experimental alloy of the invention 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)

Abstract

L'extrusion concerne des alliages de Al-Mg-Si à haute résistance et très bonne extrudabilité, ayant la composition suivante en pourcentage pondéral: Mg 0,25 - 0,40; Si 0,60 - 0,90; Fe jusqu'à 0,35; Mn jusqu'à 0,35, de préférence de 0,10 à 0,25.
PCT/GB1994/001880 1993-08-31 1994-08-30 ALLIAGES DE Al-Mg-Si SUSCEPTIBLES D'ETRE EXTRUDES WO1995006759A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
CA002169968A CA2169968C (fr) 1993-08-31 1994-08-30 Alliages al-mg-si extrudables
EP94924943A EP0716716B2 (fr) 1993-08-31 1994-08-30 Profilé extrudé en alliage Al-Mg-Si
DE69412491T DE69412491T3 (de) 1993-08-31 1994-08-30 Extrudiertes Profil aus einer AL-Mg-Si Legierung
AU75046/94A AU680679B2 (en) 1993-08-31 1994-08-30 Extrudable AL-MG-SI alloys
JP7508000A JPH09501987A (ja) 1993-08-31 1994-08-30 押し出し可能なＡｌ−Ｍｇ−Ｓｉ合金
BR9407462A BR9407462A (pt) 1993-08-31 1994-08-30 Ligas de Al-Mg-Si extrusáveis
NZ271423A NZ271423A (en) 1993-08-31 1994-08-30 Extrudable al-mg-si-mn alloys; extrusion ingots of such alloys
NO960808A NO960808L (no) 1993-08-31 1996-02-28 Ekstruderbare Al-Mg-Si legeringer
US12/288,022 US20090047172A1 (en) 1993-08-31 2008-10-15 Extrudable Al-Mg-Si alloys

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9318041.2 1993-08-31
GB939318041A GB9318041D0 (en) 1993-08-31 1993-08-31 Extrudable a1-mg-si alloys

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/288,022 Continuation US20090047172A1 (en) 1993-08-31 2008-10-15 Extrudable Al-Mg-Si alloys

Publications (1)

Publication Number Publication Date
WO1995006759A1 true WO1995006759A1 (fr) 1995-03-09

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ID=10741279

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/001880 WO1995006759A1 (fr) 1993-08-31 1994-08-30 ALLIAGES DE Al-Mg-Si SUSCEPTIBLES D'ETRE EXTRUDES

Country Status (12)

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

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998042884A1 (fr) * 1997-03-21 1998-10-01 Alcan International Limited Alliage d'aluminium, de magnesium et de silicium possedant de bonnes qualites d'extrusion
WO2000047793A1 (fr) * 1999-02-12 2000-08-17 Norsk Hydro Asa Alliage d'aluminium contenant du magnesium et du silicium
WO2000047789A1 (fr) * 1999-02-12 2000-08-17 Norsk Hydro Asa Alliage d'aluminium contenant du magnesium et du silicium
AU725909B2 (en) * 1997-03-21 2000-10-26 Alcan International Limited Al-Mg-Si alloy with good extrusion properties
WO2005038063A1 (fr) * 2003-10-22 2005-04-28 Norsk Hydro Asa Alliage de al-mg-si qui convient a l'extrusion
WO2006056481A1 (fr) * 2004-11-25 2006-06-01 Corus Aluminium Nv Feuille d'alliage a base d'aluminium pour des applications dans l'industrie automobile
BG65068B1 (bg) * 2001-08-09 2007-01-31 Norsk Hydro Asa Метод за обработване на алуминиева сплав, съдържаща магнезий и силиций

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

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Publication number Priority date Publication date Assignee Title
BE906107A (fr) * 1986-12-30 1987-04-16 Alusuisse Alliage a base d'aluminium.
EP0222479A1 (fr) * 1985-09-30 1987-05-20 Alcan International Limited Alliage d'extrusion Al-Mg-Si et procédé de fabrication
US4808247A (en) * 1986-02-21 1989-02-28 Sky Aluminium Co., Ltd. Production process for aluminum-alloy rolled sheet
EP0480402A1 (fr) * 1990-10-09 1992-04-15 Sumitomo Light Metal Industries Limited Procédé de fabrication de matériau en alliage d'aluminium présentant une aptitude excellente au formage et durcissable lors de la cuisson du vernis

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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
FR2601040B1 (fr) * 1986-07-07 1988-09-02 Cegedur Alliage d'aluminium chaudronnable et soudable et son procede de fabrication
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

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0222479A1 (fr) * 1985-09-30 1987-05-20 Alcan International Limited Alliage d'extrusion Al-Mg-Si et procédé de fabrication
US4808247A (en) * 1986-02-21 1989-02-28 Sky Aluminium Co., Ltd. Production process for aluminum-alloy rolled sheet
BE906107A (fr) * 1986-12-30 1987-04-16 Alusuisse Alliage a base d'aluminium.
EP0480402A1 (fr) * 1990-10-09 1992-04-15 Sumitomo Light Metal Industries Limited Procédé de fabrication de matériau en alliage d'aluminium présentant une aptitude excellente au formage et durcissable lors de la cuisson du vernis

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU725909B2 (en) * 1997-03-21 2000-10-26 Alcan International Limited Al-Mg-Si alloy with good extrusion properties
WO1998042884A1 (fr) * 1997-03-21 1998-10-01 Alcan International Limited Alliage d'aluminium, de magnesium et de silicium possedant de bonnes qualites d'extrusion
US6440359B1 (en) 1997-03-21 2002-08-27 Alcan International Limited Al-Mg-Si alloy with good extrusion properties
KR100566360B1 (ko) * 1999-02-12 2006-03-31 노르스크 히드로 아에스아 알루미늄과 실리콘을 함유한 알루미늄 합금
CZ300651B6 (cs) * 1999-02-12 2009-07-08 Norsk Hydro Asa Zpusob výroby slitiny hliníku, horcíku a kremíku
US6602364B1 (en) * 1999-02-12 2003-08-05 Norsk Hydro A.S. Aluminium alloy containing magnesium and silicon
AU764295B2 (en) * 1999-02-12 2003-08-14 Norsk Hydro Asa Aluminium alloy containing magnesium and silicon
AU764946B2 (en) * 1999-02-12 2003-09-04 Norsk Hydro Asa Aluminium alloy containing magnesium and silicon
US6679958B1 (en) * 1999-02-12 2004-01-20 Norsk Hydro Process of aging an aluminum alloy containing magnesium and silicon
CZ302998B6 (cs) * 1999-02-12 2012-02-15 Norsk Hydro Asa Zpusob zpracování slitiny hliníku
WO2000047793A1 (fr) * 1999-02-12 2000-08-17 Norsk Hydro Asa Alliage d'aluminium contenant du magnesium et du silicium
KR100566359B1 (ko) * 1999-02-12 2006-03-31 노르스크 히드로 아에스아 마그네슘과 실리콘을 함유한 알루미늄 합금의 처리 방법
WO2000047789A1 (fr) * 1999-02-12 2000-08-17 Norsk Hydro Asa Alliage d'aluminium contenant du magnesium et du silicium
BG65036B1 (bg) * 1999-02-12 2006-12-29 Norsk Hydro Asa Алуминиева сплав, съдържаща магнезий и силиций
BG65068B1 (bg) * 2001-08-09 2007-01-31 Norsk Hydro Asa Метод за обработване на алуминиева сплав, съдържаща магнезий и силиций
AU2004281345B2 (en) * 2003-10-22 2010-07-22 Norsk Hydro Asa Al-Mg-Si alloy suited for extrusion
WO2005038063A1 (fr) * 2003-10-22 2005-04-28 Norsk Hydro Asa Alliage de al-mg-si qui convient a l'extrusion
US8147625B2 (en) 2003-10-22 2012-04-03 Norsk Hydro Asa Al-Mg-Si alloy suited for extrusion
AU2004281345C1 (en) * 2003-10-22 2014-02-13 Norsk Hydro Asa Al-Mg-Si alloy suited for extrusion
WO2006056481A1 (fr) * 2004-11-25 2006-06-01 Corus Aluminium Nv Feuille d'alliage a base d'aluminium pour des applications dans l'industrie automobile

Also Published As

Publication number Publication date
US20090047172A1 (en) 2009-02-19
NZ271423A (en) 1997-11-24
AU7504694A (en) 1995-03-22
CA2169968C (fr) 2006-08-29
EP0716716A1 (fr) 1996-06-19
DE69412491T3 (de) 2005-07-07
EP0716716B1 (fr) 1998-08-12
DE69412491T2 (de) 1998-12-24
AU680679B2 (en) 1997-08-07
NO960808D0 (no) 1996-02-28
BR9407462A (pt) 1996-11-12
CA2169968A1 (fr) 1995-03-09
JPH09501987A (ja) 1997-02-25
NO960808L (no) 1996-02-28
EP0716716B2 (fr) 2004-12-29
GB9318041D0 (en) 1993-10-20
DE69412491D1 (de) 1998-09-17
ATE169689T1 (de) 1998-08-15

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