EP0164294B1 - Alliages à base d'aluminium contenant du lithium, du cuivre et du magnésium - Google Patents

Alliages à base d'aluminium contenant du lithium, du cuivre et du magnésium Download PDF

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Publication number
EP0164294B1
EP0164294B1 EP85420044A EP85420044A EP0164294B1 EP 0164294 B1 EP0164294 B1 EP 0164294B1 EP 85420044 A EP85420044 A EP 85420044A EP 85420044 A EP85420044 A EP 85420044A EP 0164294 B1 EP0164294 B1 EP 0164294B1
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EP
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Prior art keywords
alloys
alloy
magnesium
copper
quenching
Prior art date
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Expired
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EP85420044A
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German (de)
English (en)
French (fr)
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EP0164294A1 (fr
Inventor
Bruno Dubost
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.)
Cegedur Societe de Transformation de lAluminium Pechiney SA
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Cegedur Societe de Transformation de lAluminium Pechiney SA
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    • 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
    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C22C21/16—Alloys based on aluminium with copper as the next major constituent with magnesium

Definitions

  • the present invention relates to alloys based on Al, containing essentially Li, Cu and Mg and having high specific characteristics and high ductility.
  • lithium alloys It is known to metallurgists that the addition of lithium decreases the density and increases the modulus of elasticity and the mechanical resistance of aluminum alloys. This explains the designers' interest in these alloys for applications in the aeronautical industry, and more particularly, for lithium aluminum alloys containing other addition elements such as magnesium or copper.
  • lithium alloys must imperatively have ductility and toughness at least equivalent, with mechanical strength equal to that of conventional aeronautical alloys such as alloys 2024-T4 or T351, 2214T6 (51), 7175-T73 (51 ) or T7652 and 7150-T651 (according to the nomenclature of the Aluminum Association), which is not the case for known lithium alloys.
  • the resistance and elongation levels obtained on thin sheets in the T8 state and on thick sheets in the T651 state are however still lower than those of aeronautical alloys of the 2000 to 7000 series, as for the other alloys of the AILiCu systems and AILiCuMg with a lithium content greater than 1.7% known to date, whether these are products obtained by ingot metallurgy (for example, in semi-continuous casting) or by powder metallurgy.
  • the alloy NOR-14 whose composition, depending on the type of analysis, can be: described in the article "Correlation of microstructures, aging treatments and properties of AI-Li-Cu-Mg-Zr I / M and P / M alloys" as well as the alloy C9 with the following composition: Li: 2.9; Cu: 3.0; Mg: 2.0; Fe: 0.10; If: 0.06; Zr: 0.14; AI: rest, described in the article “Development of Lithium-Containing Aluminum alloys for the ingot metallurgy production route”.
  • the Cu content is preferably kept between 1.7 and 3.0%, it can be limited between 2 and 2.7%.
  • the Zr content is preferably between 0.10 and 0.18%.
  • Iron and silicon are preferably kept below 0.10 and 0.06% respectively.
  • Homogenization can be done in a temperature range between 0 + 10 (° C) and 8-20 (° C); the solution is preferably carried out between A ⁇ 10 ° C.
  • the optimal durations of heat treatment for homogenization at temperature 8 are 0.5 to 8 hours for alloys produced by rapid solidification (atomization - splat cooling - or any other means) and 12 to 72 hours for molded products or produced in semi-continuous casting.
  • alloys have their optimal mechanical properties after tempering of durations of 8 to 48 hours at temperatures between 170 and 220 ° C (preferably between 180 and 200 ° C) and it is preferable to subject the products to adequate form (sheets, bars, widgets) work hardening giving rise to a plastic deformation of 1 to 5% (preferably 2 to 4%) between quenching and tempering, which makes it possible to further improve the mechanical resistance of the products without degrading their ductility.
  • the alloys according to the invention have a higher mechanical strength and ductility than those of the well-known alloy AILiMgMn 01420 (Ai -5% Mg -2% Li -0.6% Mn) and have a compromise between higher mechanical strength and ductility than known AILiCuMg alloys (low magnesium contents). They also have excellent resistance to laminating corrosion.
  • alloys are therefore particularly advantageous for the manufacture of molded or wrought semi-finished products (produced by semi-continuous casting, atomization or splat cooling, etc.) whether they are, for example, extruded, rolled, forged or stamped.
  • Figure 1 shows, in perspective, a stamped part relating to Example 2 given below.
  • Billet ⁇ 200 mm were poured semi-continuously and have the analyzes reported in Table T (a). Unless otherwise indicated, the Fe and Si contents of the flows used are less than 5 to 0.04% and 0.03% respectively. These correspond either to conventional alloys (C, D), or to a known lithium alloy (E), or to alloys according to the invention (A, F) or outside the invention (B). These billets were homogenized and spun into 100 ⁇ 13 mm broads. These were then dissolved, soaked in water and returned under the conditions shown in Table 1 (b). The results of the mechanical tensile characteristics obtained in the long direction and in the long direction are reported in Table I (c) with measurements of tenacity (factor Kic) in the direction (LT). * Long-term traction, crack propagation across.
  • alloys according to the invention (A and F) have higher elongations and toughness than those of the known Li alloy (E) with equivalent elastic limits.
  • the mechanical tensile properties obtained on alloys A and F are, moreover, close to those of conventional alloys.
  • Billet ⁇ 200 mm were poured semi-continuously, homogenized, then transformed by spinning and stamping into precision stamps, the shape of which is shown in fig. 1.
  • the latter consist of a flat rectangular bottom (1) of dimensions 489 ⁇ 70 ⁇ 3 mm, bordered, on its two longitudinal edges and a transverse edge, with three ribs (2) perpendicular to the bottom, 40 to 40 high 60 mm and 3 to 5 mm thick, the longitudinal edges being separated by three small spacers (3) 1.5 mm thick.
  • the heat treatments carried out are reported in Table II (b) and the results of the mechanical characteristics obtained in the long and long transverse directions are reported in Table II (c).
  • alloys according to the invention (A and F) lead on precision stamps (not hardened between quenching and tempering) at levels of mechanical resistance and ductility at least equal to those of alloy 7175 (H ) normally used for this type of product, but more dense.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Conductive Materials (AREA)
  • Powder Metallurgy (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
EP85420044A 1984-03-15 1985-03-13 Alliages à base d'aluminium contenant du lithium, du cuivre et du magnésium Expired EP0164294B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8404482A FR2561261B1 (fr) 1984-03-15 1984-03-15 Alliages a base d'al contenant du lithium, du cuivre et du magnesium
FR8404482 1984-03-15

Publications (2)

Publication Number Publication Date
EP0164294A1 EP0164294A1 (fr) 1985-12-11
EP0164294B1 true EP0164294B1 (fr) 1989-01-18

Family

ID=9302351

Family Applications (1)

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EP85420044A Expired EP0164294B1 (fr) 1984-03-15 1985-03-13 Alliages à base d'aluminium contenant du lithium, du cuivre et du magnésium

Country Status (9)

Country Link
US (1) US4752343A (pt)
EP (1) EP0164294B1 (pt)
JP (2) JPS60215735A (pt)
BR (1) BR8501143A (pt)
CA (1) CA1268643A (pt)
DE (1) DE3567677D1 (pt)
ES (1) ES8606516A1 (pt)
FR (1) FR2561261B1 (pt)
IL (1) IL74562A (pt)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62297433A (ja) * 1986-06-18 1987-12-24 Sumitomo Light Metal Ind Ltd 構造用Ａｌ―Ｃｕ―Ｍｇ―Ｌｉ系アルミニウム合金材料の製造方法
US5032359A (en) * 1987-08-10 1991-07-16 Martin Marietta Corporation Ultra high strength weldable aluminum-lithium alloys
US5122339A (en) * 1987-08-10 1992-06-16 Martin Marietta Corporation Aluminum-lithium welding alloys
US5512241A (en) * 1988-08-18 1996-04-30 Martin Marietta Corporation Al-Cu-Li weld filler alloy, process for the preparation thereof and process for welding therewith
US5462712A (en) * 1988-08-18 1995-10-31 Martin Marietta Corporation High strength Al-Cu-Li-Zn-Mg alloys
US5455003A (en) * 1988-08-18 1995-10-03 Martin Marietta Corporation Al-Cu-Li alloys with improved cryogenic fracture toughness
US5259897A (en) * 1988-08-18 1993-11-09 Martin Marietta Corporation Ultrahigh strength Al-Cu-Li-Mg alloys
US5085830A (en) * 1989-03-24 1992-02-04 Comalco Aluminum Limited Process for making aluminum-lithium alloys of high toughness
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
US5198045A (en) * 1991-05-14 1993-03-30 Reynolds Metals Company Low density high strength al-li alloy
DE602004017787D1 (de) * 2004-09-06 2008-12-24 Federalnoe G Unitarnoe Predpr Aluminiumlegierung und daraus hergestelltes produkt
US8315214B2 (en) * 2007-05-18 2012-11-20 Research In Motion Limited Method and system for discontinuous reception de-synchronization detection
RU2497967C2 (ru) * 2007-12-04 2013-11-10 Алкоа Инк. Улучшенные алюминиево-медно-литиевые сплавы
FR3065012B1 (fr) * 2017-04-10 2022-03-18 Constellium Issoire Produits en alliage aluminium-cuivre-lithium a faible densite
CN108823519B (zh) * 2018-07-02 2021-10-01 鼎镁新材料科技股份有限公司 一种高Mg含量中强高延变形铝锂合金及其热处理方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3366165D1 (en) * 1982-02-26 1986-10-23 Secr Defence Brit Improvements in or relating to aluminium alloys
DE3365549D1 (en) * 1982-03-31 1986-10-02 Alcan Int Ltd Heat treatment of aluminium alloys
CA1198656A (en) * 1982-08-27 1985-12-31 Roger Grimes Light metal alloys
JPS59118848A (ja) * 1982-12-27 1984-07-09 Sumitomo Light Metal Ind Ltd 電気抵抗を高めた構造用アルミニウム合金

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ALUMINUM-LITHIUM ALLOYS II, PROCEEDINGS OF THE SECOND INTERNATIONAL ALUMINUM-LITHIUM CONFERENCE SPONSORED BY THE NONFERROUS METALS COMMITTE OF THE METALLURGICAL SOCIETY OF AIME, 12-14 april 1983, Monterey, California, W.S. MILLER et al.: "Development of lithium-containing aluminium alloys for the ingot metallurgy production route", p. 343. Alloy C9 *

Also Published As

Publication number Publication date
JPS63290252A (ja) 1988-11-28
CA1268643A (fr) 1990-05-08
IL74562A0 (en) 1985-06-30
BR8501143A (pt) 1985-11-12
JPS60215735A (ja) 1985-10-29
ES8606516A1 (es) 1986-04-16
DE3567677D1 (en) 1989-02-23
FR2561261A1 (fr) 1985-09-20
ES541146A0 (es) 1986-04-16
JPH0440418B2 (pt) 1992-07-02
FR2561261B1 (fr) 1992-07-24
US4752343A (en) 1988-06-21
IL74562A (en) 1988-11-15
EP0164294A1 (fr) 1985-12-11

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