EP0227563A1 - Verfahren zur Desensibilisierung gegen Abschieferungskorrosion bei Lithium enthaltenden Aluminiumlegierungen, wobei gleichzeitig hohe mechanische Festigkeitswerte erhalten werden und der Schaden begrenzt bleibt - Google Patents

Verfahren zur Desensibilisierung gegen Abschieferungskorrosion bei Lithium enthaltenden Aluminiumlegierungen, wobei gleichzeitig hohe mechanische Festigkeitswerte erhalten werden und der Schaden begrenzt bleibt Download PDF

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Publication number
EP0227563A1
EP0227563A1 EP86420293A EP86420293A EP0227563A1 EP 0227563 A1 EP0227563 A1 EP 0227563A1 EP 86420293 A EP86420293 A EP 86420293A EP 86420293 A EP86420293 A EP 86420293A EP 0227563 A1 EP0227563 A1 EP 0227563A1
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EP
European Patent Office
Prior art keywords
resistance
corrosion
less
lithium
high mechanical
Prior art date
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Granted
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EP86420293A
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English (en)
French (fr)
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EP0227563B1 (de
Inventor
Philippe Meyer
Max Reboul
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Constellium Issoire SAS
Original Assignee
Cegedur Societe de Transformation de lAluminium Pechiney SA
Cegedur Pechiney Rhenalu SA
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Application filed by Cegedur Societe de Transformation de lAluminium Pechiney SA, Cegedur Pechiney Rhenalu SA filed Critical Cegedur Societe de Transformation de lAluminium Pechiney SA
Priority to AT86420293T priority Critical patent/ATE52109T1/de
Publication of EP0227563A1 publication Critical patent/EP0227563A1/de
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    • 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
    • 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
    • C22F1/057—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 copper as the next major constituent

Definitions

  • the present invention relates to a method for desensitizing to exfoliating corrosion of Al alloys containing Li by treatment of under-tempering, leading simultaneously to high mechanical strengths and good resistance to damage.
  • the 2024 alloy (according to the designation of the Aluminum Association) used in the parts most stressed in fatigue-traction, offers the best compromise between mechanical strength and fatigue resistance; however, this alloy is used in the T4 or T3 state, that is to say matured at room temperature and therefore does not exhibit good resistance to flaky corrosion as soon as the thickness of the product exceeds a few millimeters. .
  • the tempering must be carried out in a following temperature-time domain: and with: t: tempering time in hours T: tempering temperatures in ° C.
  • the tempering is carried out at a temperature less than or equal to 155 ° C. and / or for a duration (in hours) greater than 24 ⁇ 5 exp ((150-T) / 30), the temperature T being expressed in ° C. * exp. means exponent or power
  • the alloy thus treated has a sensitivity to the EXCO test less than or equal to B, which corresponds to good behavior in a natural atmosphere, a mechanical resistance at least comparable to 2024 (T3 or T4 state) and good resistance to damage.
  • the invention applies in particular to aluminum-lithium alloys containing by weight%: Li 1 to 4; Cu 0 to 5; Mg 0 to 7; Zr 0 to 0.2; Cr 0 to 0.4; Mn 0 to 1; Fe, ⁇ 0.5; If ⁇ 0.5; other elements such as Hf, Nb, V, W, Ta, Ti, each less than 0.5 X, remain aluminum and usual impurities.
  • alloys can be obtained by metallurgy of the ingot or by rapid solidification process (powder metallurgy, "splat cooling", rapid solidification of ribbons, etc.).
  • the invention applies to any form of product (forged, stamped, rolled, spun, drawn), as well as to molded alloys, not undergoing any wrinkling.
  • FIG. 1 representing the range of fatigue crack lengths as a function of the number of cycles undergone.
  • alloys or heat treatments conform to the designations of the Aluminum Association and the percentages of alloy elements are percentages by weight.
  • This example 1 shows the good correlation between the real atmospheric tests and the EXCO test for samples of over-tempered Al-Li alloy.
  • An 8090 alloy 2.7% Li; 1.3% Cu; 1% Mg; 0.11% Zr; 0.04% Fe; 0.03% Si; aluminum remainder was cast in billet ⁇ 200 mm, homogenized 24 h at 533 ° C, peeled at ⁇ 140 mm, spun into larget 100 x 13 mm 2 at the temperature of 430 ° C (spinning ratio ⁇ 12), put in solution for 1 hour 30 minutes at 535 ° C, soaked in cold water, tracted by 2% and subjected to various tempering treatments.
  • a larget, section 100 x 13 of alloy 2024 T351 is taken as reference.
  • the spun larvae samples were machined at half their thickness over half their width, in order to present both a rough surface finish and a machined surface.
  • KcA apparent toughness
  • FIG. 1 gives the ranges of the curves: length of the cracks (2a) as a function of the number of cycles (N), for the directions between the long direction and the transverse direction of the sheet for these two alloys: it can be seen that the two alloys are roughly equivalent, with a tendency to superiority of 2091 compared to 2024 for high numbers of cycles and less dispersion of results for the first.

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)
  • Heat Treatment Of Steel (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
EP86420293A 1985-11-28 1986-11-26 Verfahren zur Desensibilisierung gegen Abschieferungskorrosion bei Lithium enthaltenden Aluminiumlegierungen, wobei gleichzeitig hohe mechanische Festigkeitswerte erhalten werden und der Schaden begrenzt bleibt Expired - Lifetime EP0227563B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86420293T ATE52109T1 (de) 1985-11-28 1986-11-26 Verfahren zur desensibilisierung gegen abschieferungskorrosion bei lithium enthaltenden aluminiumlegierungen, wobei gleichzeitig hohe mechanische festigkeitswerte erhalten werden und der schaden begrenzt bleibt.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8518208 1985-11-28
FR8518208 1985-11-28

Publications (2)

Publication Number Publication Date
EP0227563A1 true EP0227563A1 (de) 1987-07-01
EP0227563B1 EP0227563B1 (de) 1990-04-18

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ID=9325580

Family Applications (1)

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EP86420293A Expired - Lifetime EP0227563B1 (de) 1985-11-28 1986-11-26 Verfahren zur Desensibilisierung gegen Abschieferungskorrosion bei Lithium enthaltenden Aluminiumlegierungen, wobei gleichzeitig hohe mechanische Festigkeitswerte erhalten werden und der Schaden begrenzt bleibt

Country Status (8)

Country Link
EP (1) EP0227563B1 (de)
JP (1) JPS62142752A (de)
AT (1) ATE52109T1 (de)
BR (1) BR8605809A (de)
CA (1) CA1291927C (de)
DE (1) DE3670510D1 (de)
ES (1) ES2014248B3 (de)
IL (1) IL80765A0 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5133931A (en) * 1990-08-28 1992-07-28 Reynolds Metals Company Lithium aluminum alloy system
FR2675816A1 (fr) * 1991-04-24 1992-10-30 Hoogovens Aluminium Gmbh Procede pour la fabrication de toles d'aluminium.
US5198045A (en) * 1991-05-14 1993-03-30 Reynolds Metals Company Low density high strength al-li alloy
US5211910A (en) * 1990-01-26 1993-05-18 Martin Marietta Corporation Ultra high strength aluminum-base alloys
GB2262744A (en) * 1991-12-26 1993-06-30 Korea Inst Sci & Tech Thermo mechanical treatment method for providing superplasticity to al-li alloy
US5240521A (en) * 1991-07-12 1993-08-31 Inco Alloys International, Inc. Heat treatment for dispersion strengthened aluminum-base alloy
US5259897A (en) * 1988-08-18 1993-11-09 Martin Marietta Corporation Ultrahigh strength Al-Cu-Li-Mg alloys
EP0571542A1 (de) * 1991-02-15 1993-12-01 Reynolds Metals Company Aluminium-lithiumlegierung mit geringer dichte
US5462712A (en) * 1988-08-18 1995-10-31 Martin Marietta Corporation High strength Al-Cu-Li-Zn-Mg alloys
WO2010130887A1 (fr) * 2009-05-13 2010-11-18 Alcan Rhenalu Procede d'assemblage par soudage de pieces en alliage d'aluminium avec deformation a froid suivi d'un revenu post soudage de l'ensemble de la zone soudee
US8118950B2 (en) 2007-12-04 2012-02-21 Alcoa Inc. Aluminum-copper-lithium alloys

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8333853B2 (en) 2009-01-16 2012-12-18 Alcoa Inc. Aging of aluminum alloys for improved combination of fatigue performance and strength

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150456A2 (de) * 1983-12-30 1985-08-07 The Boeing Company Alterung bei relativ niedrigen Temperaturen von Lithium enthaltenden Aluminiumlegierungen
EP0157600A2 (de) * 1984-03-29 1985-10-09 Aluminum Company Of America Aluminium-Lithium-Legierungen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3613224A1 (de) * 1985-08-20 1987-02-26 Boeing Co Aluminium-lithium-legierung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150456A2 (de) * 1983-12-30 1985-08-07 The Boeing Company Alterung bei relativ niedrigen Temperaturen von Lithium enthaltenden Aluminiumlegierungen
EP0157600A2 (de) * 1984-03-29 1985-10-09 Aluminum Company Of America Aluminium-Lithium-Legierungen

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5462712A (en) * 1988-08-18 1995-10-31 Martin Marietta Corporation High strength Al-Cu-Li-Zn-Mg alloys
US5259897A (en) * 1988-08-18 1993-11-09 Martin Marietta Corporation Ultrahigh strength Al-Cu-Li-Mg alloys
US5211910A (en) * 1990-01-26 1993-05-18 Martin Marietta Corporation Ultra high strength aluminum-base alloys
US5133931A (en) * 1990-08-28 1992-07-28 Reynolds Metals Company Lithium aluminum alloy system
EP0571542A1 (de) * 1991-02-15 1993-12-01 Reynolds Metals Company Aluminium-lithiumlegierung mit geringer dichte
EP0571542A4 (en) * 1991-02-15 1993-12-29 Reynolds Metals Company Reynolds Metals Building Low density aluminum lithium alloy
FR2675816A1 (fr) * 1991-04-24 1992-10-30 Hoogovens Aluminium Gmbh Procede pour la fabrication de toles d'aluminium.
US5198045A (en) * 1991-05-14 1993-03-30 Reynolds Metals Company Low density high strength al-li alloy
US5240521A (en) * 1991-07-12 1993-08-31 Inco Alloys International, Inc. Heat treatment for dispersion strengthened aluminum-base alloy
GB2262744A (en) * 1991-12-26 1993-06-30 Korea Inst Sci & Tech Thermo mechanical treatment method for providing superplasticity to al-li alloy
GB2262744B (en) * 1991-12-26 1995-01-04 Korea Inst Sci & Tech Thermo mechanical treatment method for providing superplasticity to al-li alloy
US8118950B2 (en) 2007-12-04 2012-02-21 Alcoa Inc. Aluminum-copper-lithium alloys
US9587294B2 (en) 2007-12-04 2017-03-07 Arconic Inc. Aluminum-copper-lithium alloys
WO2010130887A1 (fr) * 2009-05-13 2010-11-18 Alcan Rhenalu Procede d'assemblage par soudage de pieces en alliage d'aluminium avec deformation a froid suivi d'un revenu post soudage de l'ensemble de la zone soudee
FR2945464A1 (fr) * 2009-05-13 2010-11-19 Alcan Rhenalu Procede d'assemblage par soudage de pieces en alliage d'aluminium.
CN102421563A (zh) * 2009-05-13 2012-04-18 法国肯联铝业 包括冷变形以及随后进行整个焊接区域的焊接后回火的用于通过焊接组装铝合金部件的方法
US8469255B2 (en) 2009-05-13 2013-06-25 Constellium France Method for assembling aluminum alloy parts by welding
CN102421563B (zh) * 2009-05-13 2015-07-15 法国肯联铝业 包括冷变形以及随后进行整个焊接区域的焊接后回火的用于通过焊接组装铝合金部件的方法
US9555504B2 (en) 2009-05-13 2017-01-31 Constellium Issoire Method for assembling aluminum alloy parts by welding

Also Published As

Publication number Publication date
EP0227563B1 (de) 1990-04-18
ES2014248B3 (es) 1990-07-01
IL80765A0 (en) 1987-02-27
CA1291927C (fr) 1991-11-12
JPS62142752A (ja) 1987-06-26
ATE52109T1 (de) 1990-05-15
BR8605809A (pt) 1987-08-25
DE3670510D1 (de) 1990-05-23

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