EP0157711B1 - Verfahren zur Herstellung von Gegenständen aus Al-Li-Mg-Cu Legierungen mit hoher Duktilität und Isotropie - Google Patents

Verfahren zur Herstellung von Gegenständen aus Al-Li-Mg-Cu Legierungen mit hoher Duktilität und Isotropie Download PDF

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Publication number
EP0157711B1
EP0157711B1 EP85420041A EP85420041A EP0157711B1 EP 0157711 B1 EP0157711 B1 EP 0157711B1 EP 85420041 A EP85420041 A EP 85420041A EP 85420041 A EP85420041 A EP 85420041A EP 0157711 B1 EP0157711 B1 EP 0157711B1
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Prior art keywords
range
intermediate annealing
cold
process according
isotropy
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Expired
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EP85420041A
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English (en)
French (fr)
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EP0157711A1 (de
Inventor
Philippe Meyer
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 Societe de Transformation de lAluminium Pechiney SA
Pechiney Rhenalu SAS
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Application filed by Cegedur Societe de Transformation de lAluminium Pechiney SA, Pechiney Rhenalu SAS filed Critical Cegedur Societe de Transformation de lAluminium Pechiney SA
Priority to AT85420041T priority Critical patent/ATE31329T1/de
Publication of EP0157711A1 publication Critical patent/EP0157711A1/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
    • C22F1/057—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 invention relates to a process for obtaining alloyed products based on AI essentially containing Li, Mg and Cu as element of main alloys and having a high ductility and isotropy.
  • the ranges of conventional manufacturing which include in particular a homogenization of the initial products obtained either by casting or by powder metallurgy, possible scalping, hot transformation, cold transformation with one or more intermediate anneals if necessary, dissolution and tempering, with a possible strain relief between these two last operations, lead, on alloys of the AI-Li-Mg-Cu family, to mechanical tensile characteristics (breaking load Rm, elastic limit Rp 0.2 and ductility A %) varying very significantly depending on the direction of sampling compared to the main direction of hot and cold processing (long sense) of the products.
  • the method according to the invention makes it possible to considerably improve the isotropy of the mechanical characteristics of products of alloy type AI-Li-Mg-Cu, while also improving their ductility.
  • a hot transformation at a temperature below 420 ° C, generally between 100 and 400 ° C and preferably between 300 and 350 ° C until the desired final dimensions or up to intermediate dimensions.
  • this hot transformation is followed by the conventional treatments for dissolution (generally between 500 ° and 550 ° C. depending on the alloy) and thermomechanical treatments for structural hardening.
  • the intermediate product is generally brought to the final dimensions by cold processing, using one or more intermediate anneals, if necessary. These can be done just before cold processing and / or during it. In this case, at least one of these anneals is carried out in a temperature range between 200 and 550 ° C.
  • the holding times are of the order of a few minutes to several hours, the shortest times generally being associated with the highest temperatures.
  • the cooling rate after this (or these) intermediate annealing (s) is an important parameter of the process and should preferably be between 1500 ° C / sec and 30 ° C / hour.
  • the speeds higher than 1500 ° C / sec are difficult to reach industrially, except on very thin product, and the speeds lower than 30 ° C / hour do not bring an appreciable improvement to the isotropy.
  • the intermediate annealing (s) can be conducted, as is known, either in salt bath furnaces (nitrite-nitrate, nitrate-nitrate), or in static ventilated air ovens, or in passage ovens.
  • the products undergo the usual solutions for dissolving, quenching and thermomechanical treatment for structural hardening, the dissolving constituting ipso facto the final annealing.
  • FIGS. 1 and 2 show in polar coordinates the variations in the mechanical traction characteristics obtained on sheets according to the direction of removal according to conventional ranges (marks A to F) or according to the invention (marks 1 and 2).
  • Tensile samples were taken in the directions 0 ° (long direction L), 30 °, 60 ° and 90 ° (long direction long TL) relative to the rolling direction.
  • the tensile test pieces were taken under the same conditions as above.

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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)
  • Manufacture And Refinement Of Metals (AREA)
  • Powder Metallurgy (AREA)
  • Continuous Casting (AREA)
  • Physical Vapour Deposition (AREA)
  • Conductive Materials (AREA)
  • Metal Rolling (AREA)

Claims (5)

1. Verfahren zur Herstellung von Legierungsprodukten auf Aluminiumbasis mit im wesentlichen Li, Mg und Cu als Hauptlegierungselemente durch Verhüttung, Homogenisierung, Warmumwandlung, ggf. Kaltumwandlung mit Zwischenglühungen, wenn notwendig, Inlösungbringen, Abschreckung, ggf. kontrollierter Kaltverformung und Ausglühung, dadurch gekennzeichnet, dass die Warmumwandlung bei einer Temperatur von 100 bis 420°C erfolgt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass mindestens eine der Zwischenausglühungen vor und/oder während der Kaltumwandlung bei einer Temperatur von 200 bis 550°C durchgeführt wird.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Abkühlung nach der (den) Zwischenausglühung(en) mit einer Geschwindigkeit von 1500°C/s bis 30°C/h durchgeführt wird.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Warmumwandlung im Bereich von 100 bis 400°C durchgeführt wird.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Warmumwandlung in einem Bereich von 300 bis 350°C durchgeführt wird.
EP85420041A 1984-03-15 1985-03-11 Verfahren zur Herstellung von Gegenständen aus Al-Li-Mg-Cu Legierungen mit hoher Duktilität und Isotropie Expired EP0157711B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85420041T ATE31329T1 (de) 1984-03-15 1985-03-11 Verfahren zur herstellung von gegenstaenden aus al-li-mg-cu legierungen mit hoher duktilitaet und isotropie.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8404481A FR2561264B1 (fr) 1984-03-15 1984-03-15 Procede d'obtention de produits en alliages al-li-mg-cu a ductilite et isotropie elevees
FR8404481 1984-03-15

Publications (2)

Publication Number Publication Date
EP0157711A1 EP0157711A1 (de) 1985-10-09
EP0157711B1 true EP0157711B1 (de) 1987-12-09

Family

ID=9302350

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85420041A Expired EP0157711B1 (de) 1984-03-15 1985-03-11 Verfahren zur Herstellung von Gegenständen aus Al-Li-Mg-Cu Legierungen mit hoher Duktilität und Isotropie

Country Status (9)

Country Link
US (1) US4652314A (de)
EP (1) EP0157711B1 (de)
JP (1) JPS60211057A (de)
AT (1) ATE31329T1 (de)
BR (1) BR8501142A (de)
CA (1) CA1268689A (de)
DE (1) DE3561163D1 (de)
FR (1) FR2561264B1 (de)
IL (1) IL74575A (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61166938A (ja) * 1985-01-16 1986-07-28 Kobe Steel Ltd 展伸用Ａｌ−Ｌｉ系合金およびその製造方法
FR2610949B1 (fr) * 1987-02-18 1992-04-10 Cegedur Procede de desensibilisation a la corrosion sous tension des alliages d'al contenant du li
FR2626009B2 (fr) * 1987-02-18 1992-05-29 Cegedur Produit en alliage d'al contenant du li resistant a la corrosion sous tension
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
FR2646172B1 (fr) * 1989-04-21 1993-09-24 Cegedur Alliage al-li-cu-mg a bonne deformabilite a froid et bonne resistance aux dommages
GB8926861D0 (en) * 1989-11-28 1990-01-17 Alcan Int Ltd Improvements in or relating to aluminium alloys
US5211910A (en) * 1990-01-26 1993-05-18 Martin Marietta Corporation Ultra high strength aluminum-base alloys
US5106430A (en) * 1990-02-12 1992-04-21 Allied-Signal, Inc. Rapidly solidified aluminum lithium alloys having zirconium
US5133931A (en) * 1990-08-28 1992-07-28 Reynolds Metals Company Lithium aluminum alloy system
DE4113352C2 (de) * 1991-04-24 1996-05-23 Hoogovens Aluminium Gmbh Verfahren zur Herstellung von Aluminiumblechen
FR2676462B1 (fr) * 1991-05-14 1995-01-13 Pechiney Rhenalu Procede pour ameliorer l'isotropie travers des produits epais en alliages d'al.
US5198045A (en) * 1991-05-14 1993-03-30 Reynolds Metals Company Low density high strength al-li alloy
KR940008071B1 (ko) * 1991-12-26 1994-09-01 한국과학기술연구원 Al-Li합금의 초소성화 가공열처리 방법
US6120623A (en) * 1997-02-19 2000-09-19 Alcan International Limited Process of producing aluminum alloy sheet exhibiting reduced roping effects

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019931A (en) * 1976-03-04 1977-04-26 Swiss Aluminium Ltd. Thread plate process
JPS5441972A (en) * 1977-07-12 1979-04-03 Mitsubishi Petrochem Co Ltd Preparation of laminated composite film of biaxially oriented propylene polymer having excellent gas barrier properties
GB2121822B (en) * 1982-03-31 1985-07-31 Alcan Int Ltd Al-li-cu-mg alloys

Also Published As

Publication number Publication date
EP0157711A1 (de) 1985-10-09
DE3561163D1 (en) 1988-01-21
ATE31329T1 (de) 1987-12-15
BR8501142A (pt) 1985-11-12
IL74575A (en) 1988-07-31
IL74575A0 (en) 1985-06-30
FR2561264B1 (fr) 1986-06-27
US4652314A (en) 1987-03-24
CA1268689A (fr) 1990-05-08
JPS60211057A (ja) 1985-10-23
FR2561264A1 (fr) 1985-09-20

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