EP0227563B1 - 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

Info

Publication number
EP0227563B1
EP0227563B1 EP86420293A EP86420293A EP0227563B1 EP 0227563 B1 EP0227563 B1 EP 0227563B1 EP 86420293 A EP86420293 A EP 86420293A EP 86420293 A EP86420293 A EP 86420293A EP 0227563 B1 EP0227563 B1 EP 0227563B1
Authority
EP
European Patent Office
Prior art keywords
resistance
corrosion
lithium
less
alloys
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
EP86420293A
Other languages
English (en)
French (fr)
Other versions
EP0227563A1 (de
Inventor
Philippe Meyer
Max Reboul
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.)
Constellium Issoire SAS
Original Assignee
Cegedur Pechiney Rhenalu SA
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=9325580&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0227563(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Cegedur Pechiney Rhenalu SA filed Critical Cegedur Pechiney Rhenalu SA
Priority to AT86420293T priority Critical patent/ATE52109T1/de
Publication of EP0227563A1 publication Critical patent/EP0227563A1/de
Application granted granted Critical
Publication of EP0227563B1 publication Critical patent/EP0227563B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • C22F1/047—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 process for desensitizing to exfoliating corrosion of AI alloys containing Li by treatment of under-income, 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 most stressed parts 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 is carried out at a temperature less than or equal to 155 ° C.
  • 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%, 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 domain of the lengths of fatigue cracks 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.
  • 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
  • Figure 1 gives the plagues of the curves: length of the cracks (2a) as a function of the number of cycles (N), for the directions included between the long direction and the transverse direction of the sheet for these two alloys: we note 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.
  • An alloy of composition 2.7 Li; 1.0 Mg; 1.3 Cu; 0.11 Zr; 0.04 Fe; 0.03 Si; aluminum remainder is cast in ⁇ 200 mm billets, homogenized 24 h at 535 ° C, peeled at 140 mm, spun into section 100 x 13 mm 2 at 430 ° C, dissolved in 1 h 30 at 535 ° C, soaked in cold water, pulled by 2% and tempered according to the conditions given in Table IV below.

Landscapes

  • 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)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Claims (3)

1. Verfahren zur thermischen Behandlung von Lithium enthaltenden Aluminiumlegierungen zur Verbesserung ihrer Abblätterungskorrosionsbeständigkeit unter gleichzeitiger Beibehaltung einer hohen mechanischen Festigkeit und einer guten Beschädigungswiderstandsfähigkeit, dadurch gekennzeichnet, daß das Endglühen im folgenden Bereich Temperatur T (°C) - Zeit t (h) durchgeführt wird:
t ≥ 24 x 5 hoch ((150-T)/30)
t ≤ 80 x 5 hoch ((150―T)/30, wobei T 160°C für Mg ≥ 2%
T ≤ 160°C-5 (2-% Mg)°C für 1 ≤ Mg ≤ 2%
T 155°C für Mg ≤ 1 %.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Behandlung bei einer Temperatur unter oder gleich 155°C durchgeführt wird.
3. Anwendung des Verfahrens nach Anspruch 1 oder 2 auf Legierungen mit einem Gewichtsanteil von 1-4% Li, 1-5% Cu, unter 7% Mg, unter 0,2% Zr, unter 0,4% Cr, unter 1 % Mn, unter 0,5% jedes der folgenden Elemente: Fe, Si, Hf, Nb, V, W, Ta, Ti, wobei der Rest AI und übliche Verunreinigungen sind.
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 EP0227563A1 (de) 1987-07-01
EP0227563B1 true EP0227563B1 (de) 1990-04-18

Family

ID=9325580

Family Applications (1)

Application Number Title Priority Date Filing Date
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)

Families Citing this family (12)

* 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
US5234662A (en) * 1991-02-15 1993-08-10 Reynolds Metals Company Low density aluminum lithium alloy
DE4113352C2 (de) * 1991-04-24 1996-05-23 Hoogovens Aluminium Gmbh Verfahren zur Herstellung von Aluminiumblechen
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
KR940008071B1 (ko) * 1991-12-26 1994-09-01 한국과학기술연구원 Al-Li합금의 초소성화 가공열처리 방법
EP2231888B1 (de) 2007-12-04 2014-08-06 Alcoa Inc. Verbesserte aluminium-kupfer-lithium-legierungen
US8333853B2 (en) 2009-01-16 2012-12-18 Alcoa Inc. Aging of aluminum alloys for improved combination of fatigue performance and strength
FR2945464B1 (fr) * 2009-05-13 2012-03-23 Alcan Rhenalu Procede d'assemblage par soudage de pieces en alliage d'aluminium.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0214381A1 (de) * 1985-08-20 1987-03-18 The Boeing Company Aluminium-Lithiumlegierung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150456B1 (de) * 1983-12-30 1990-11-14 The Boeing Company Alterung bei relativ niedrigen Temperaturen von Lithium enthaltenden Aluminiumlegierungen
US4648913A (en) * 1984-03-29 1987-03-10 Aluminum Company Of America Aluminum-lithium alloys and method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0214381A1 (de) * 1985-08-20 1987-03-18 The Boeing Company Aluminium-Lithiumlegierung

Also Published As

Publication number Publication date
ES2014248B3 (es) 1990-07-01
JPS62142752A (ja) 1987-06-26
IL80765A0 (en) 1987-02-27
CA1291927C (fr) 1991-11-12
ATE52109T1 (de) 1990-05-15
BR8605809A (pt) 1987-08-25
EP0227563A1 (de) 1987-07-01
DE3670510D1 (de) 1990-05-23

Similar Documents

Publication Publication Date Title
EP0124286B1 (de) Aluminiumlegierungen
EP0787217B1 (de) VERFAHREN ZUR HERSTELLUNG VON GEGENSTÄDEN AUS AlSiMgCu-LEGIERUNG MIT VERBESSERTEN INTERKRISTALLINKORROSIONSWIEDERSTAND
EP1114877B1 (de) Strukturelement eines Flugzeugs aus Al-Cu-Mg Legierung
EP0227563B1 (de) Verfahren zur Desensibilisierung gegen Abschieferungskorrosion bei Lithium enthaltenden Aluminiumlegierungen, wobei gleichzeitig hohe mechanische Festigkeitswerte erhalten werden und der Schaden begrenzt bleibt
US20110240178A1 (en) Al-Mg-Si ALUMINUM ALLOY EXTRUDED PRODUCT EXHIBITING EXCELLENT FATIGUE STRENGTH AND IMPACT FRACTURE RESISTANCE
EP1382698B1 (de) Knetprodukt aus Al-Cu-Mg-Legierung für das Strukturbauteil eines Flugzeugs
JPH02190434A (ja) 強度、靭性および腐食に関する改良された組合せを有するアルミニウム合金製品
JPS63286557A (ja) Ａｌ基合金から物品を製造する方法
EP0679199B1 (de) Al-si-mg-legierung mit verbesserter dehnbarkeit und tiefzieheigenschaften und verfahren zu deren herstellung
EP0157711B1 (de) Verfahren zur Herstellung von Gegenständen aus Al-Li-Mg-Cu Legierungen mit hoher Duktilität und Isotropie
EP0282421B1 (de) Zugspannungsbeständiges Lithium enthaltendes Aluminiumlegierungs-Erzeugnis und Verfahren zu seiner Herstellung
US11186899B2 (en) Magnesium-zinc-manganese-tin-yttrium alloy and method for making the same
GB2137227A (en) Aluminium-Lithium Alloys
US5643372A (en) Process for the desensitisation to intercrystalline corrosion of 2000 and 6000 series Al alloys and corresponding products
EP0210112A1 (de) Lithiumenthaltende Gegenstände auf Aluminiumbasis, verwendbar in rekristallisiertem Zustand und Verfahren zu ihrer Herstellung
JP2001262265A (ja) 高成形性アルミニウム合金板の熱間圧延材
US20050039831A1 (en) Blister-free aluminum forgings and method of making the same
KR20230090332A (ko) 개선된 7xxx 알루미늄 합금
FR2646172A1 (fr) Alliage al-li-cu-mg a bonne deformabilite a froid et bonne resistance aux dommages
RU2232828C2 (ru) Способ получения изделий из сплава алюминий-магний-литий
JPH03294445A (ja) 成形加工性の良好な高力アルミニウム合金およびその製造法
EP0514292B1 (de) Verfahren zur Verbesserung der Querisotropie eines dünnen Produktes aus einer AA 7000 Aluminium-Legierung
JPH09111429A (ja) 最終成形加工時にストレッチャー・ストレインマークの発生しない熱処理型Ａｌ合金の製造方法
FR2610949A1 (fr) Procede de desensibilisation a la corrosion sous tension des alliages d'al contenant du li
Dix Jr Service Characteristics of Light Alloys

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19870709

17Q First examination report despatched

Effective date: 19890601

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: CEGEDUR PECHINEY RHENALU

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 52109

Country of ref document: AT

Date of ref document: 19900515

Kind code of ref document: T

ITF It: translation for a ep patent filed

Owner name: ING. A. GIAMBROCONO & C. S.R.L.

REF Corresponds to:

Ref document number: 3670510

Country of ref document: DE

Date of ref document: 19900523

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ITTA It: last paid annual fee
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: ALCAN INTERNATIONAL LIMITED

Effective date: 19910117

NLR1 Nl: opposition has been filed with the epo

Opponent name: ALCAN INTERNATIONAL LIMITED.

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19911017

Year of fee payment: 6

Ref country code: AT

Payment date: 19911017

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19911018

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19911019

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19911023

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19911108

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19911113

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19911129

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19911130

Year of fee payment: 6

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

27W Patent revoked

Effective date: 19910921

GBPR Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

NLR2 Nl: decision of opposition
BERE Be: lapsed

Owner name: CEGEDUR PECHINEY RHENALU

Effective date: 19921130

EUG Se: european patent has lapsed

Ref document number: 86420293.2

Effective date: 19920212