EP0158571B1 - Alliages al-cu-li-mg à très haute résistance mécanique spécifique - Google Patents
Alliages al-cu-li-mg à très haute résistance mécanique spécifique Download PDFInfo
- Publication number
- EP0158571B1 EP0158571B1 EP85420043A EP85420043A EP0158571B1 EP 0158571 B1 EP0158571 B1 EP 0158571B1 EP 85420043 A EP85420043 A EP 85420043A EP 85420043 A EP85420043 A EP 85420043A EP 0158571 B1 EP0158571 B1 EP 0158571B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloys
- lithium
- mechanical resistance
- alloy
- high specific
- 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
Links
Classifications
-
- 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
-
- 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
Definitions
- the present invention relates to alloys based on AI essentially containing Cu, Li and Mg, having a very high specific mechanical resistance and usable in particular, for obtaining heat-treated parts of complex shape.
- metallurgists have proposed a new experimental alloy with nominal composition AI-3% Li-2% Cu-0.2% Zr (with high strength, low density and low ductility), as well as new alloys of the Aluminum-Lithium system. -Copper-Magnesium with medium resistance, low density and improved ductility. This is in particular the alloy of average composition AI-2.4% Li-1.25% Cu-0.75% Mg (- Cr-Mn-Zr-Ni) which has been the subject of the European Patent Application No. 0088511 to the Secretary for Defense of the United Kingdom.
- the alloy AI-2.0-2.4% Li-2.3-2.7% Cu up to 0.9% Mg up to 0.15% Zr and Fe up to 0 are also known. 12% Si, which was the subject of European patent application No. EP-A-0 156 995 not yet published on the date of filing of this application.
- the invention described below makes it possible to have new lithium alloys which do not have these limitations.
- These alloys give products of any configuration very high mechanical properties in the T6 state (equivalent to those of alloys 7075-T 6 and 7010-T 736) combined with a density reduced by 6 to 9% compared to that of alloys conventional of the 2000 or 7000 series.
- the alloy products according to the invention have a specific mechanical resistance further improved by work hardening between quenching and tempering (states T-651, T-652 or T-8) but this deformation operation plastic can be limited, for example, to the sole holding or leveling of hardened products.
- the alloys according to the invention have the following weight compositions:
- compositions taken individually or in combinations are as follows:
- the alloys according to the invention have their optimum level of resistance and ductility after homogenization treatments of the cast products and dissolving of the processed products comprising at least one bearing at a temperature O H of between 520 and 545 ° C for a sufficient time either to completely dissolve the intermetallic compounds of the phases rich in Cu and Li and either to obtain a size less than 5 ⁇ m.
- the optimal durations of heat treatment for homogenization at O H temperature were 0.5 to 8 hours for alloys produced by rapid solidification (atomization-splat cooling) and 12 hours to 72 hours for products molded or produced in semi casting -continuous, for which it is preferable to carry out, during the homogenization or the dissolution, one or two intermediate stages of a few hours at 500 ° C, 515 ° C or 528 ° C approximately so as to avoid the beginning melting of the alloy when it is kept at the temperature On.
- tempering kinetics tests have shown that these alloys have their optimal mechanical properties after tempering lasting 8 hours to 48 hours at temperatures between 170 and 220 ° C (preferably between 190 and 200 ° C), and that it was preferable to subject the products of adequate shape (sheets, bars, widgets) to work hardening giving rise to a plastic deformation of 1.5 to 5% (preferably 2 to 4%) between quenching and tempering, which further improves the compromise between mechanical strength and ductility of these alloys.
- the alloys according to the invention have in the T-6 (51) state a mechanical resistance equivalent to that of the 7075 or 7010 T-6 (51) alloys.
- These high levels of elastic limit and breaking load are moreover combined with densities reduced by 6 to 8% compared to those of conventional aeronautical aluminum alloys. (without lithium) and with satisfactory levels of ductility or elongation, which shows the advantage of the alloys according to the invention for the production of wrought or molded structural parts with very high specific mechanical strength and good dynamic properties (toughness, resistance fatigue), whether these are products produced by semi-continuous casting, atomization or splat-cooling.
- Ingots the analysis of which is given in Table 1a, were produced from refined aluminum (AI 99.99%), refined by adding 0.15% AT5B, then cast into molds with a structure similar to that obtained by semi-continuous industrial casting.
- All these alloys contain less than 0.02% (by weight) of Fe and less than 0.02% of Si.
- alloys were homogenized under the conditions making it possible to obtain an almost complete dissolution of the intermetallic compounds rich in lithium and copper, and quenched with water at 20 ° C. they have matured for at least 5 days and 24 hour treatments at temperatures of 150, 170, 190 and 210 ° C.
- Table Ib gives the heat treatments and the average Vickers hardnesses after tempering, as well as the maximum specific hardness of each of these alloys (Vickers hardness / density ratio).
- the alloys were poured semi-continuously in the form of ⁇ 200 mm billets.
- the billets were homogenized at 515 ° C for 16 h + 24 h at 535 ° C, peeled and spun into strips 50 x 20 mm at 430 ° C (i.e. with a spinning ratio of 12).
- the largets were dissolved in 539 ° C and soaked in water and underwent various incomes.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Forging (AREA)
- Conductive Materials (AREA)
- Physical Vapour Deposition (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Continuous Casting (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8404483A FR2561260B1 (fr) | 1984-03-15 | 1984-03-15 | Alliages al-cu-li-mg a tres haute resistance mecanique specifique |
FR8404483 | 1984-03-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0158571A1 EP0158571A1 (fr) | 1985-10-16 |
EP0158571B1 true EP0158571B1 (fr) | 1987-09-30 |
Family
ID=9302352
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85420043A Expired EP0158571B1 (fr) | 1984-03-15 | 1985-03-13 | Alliages al-cu-li-mg à très haute résistance mécanique spécifique |
Country Status (9)
Country | Link |
---|---|
US (1) | US4840683A (pt) |
EP (1) | EP0158571B1 (pt) |
JP (2) | JPS60215734A (pt) |
BR (1) | BR8501144A (pt) |
CA (1) | CA1287508C (pt) |
DE (1) | DE3560729D1 (pt) |
ES (1) | ES541151A0 (pt) |
FR (1) | FR2561260B1 (pt) |
IL (1) | IL74604A (pt) |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5133930A (en) * | 1983-12-30 | 1992-07-28 | The Boeing Company | Aluminum-lithium alloy |
US4806174A (en) * | 1984-03-29 | 1989-02-21 | Aluminum Company Of America | Aluminum-lithium alloys and method of making the same |
DE3613224A1 (de) * | 1985-08-20 | 1987-02-26 | Boeing Co | Aluminium-lithium-legierung |
EP0250656A1 (en) * | 1986-07-03 | 1988-01-07 | The Boeing Company | Low temperature underaging of lithium bearing alloys |
CA1321126C (en) * | 1986-11-04 | 1993-08-10 | Alex Cho | Method for producing unrecrystallized aluminium-lithium product with improved strength and fracture toughness |
FR2607521A1 (fr) * | 1986-12-02 | 1988-06-03 | Cegedur | Methode de traitement thermique des alliages a base d'al et contenant du li et produit ainsi obtenu |
US4812178A (en) * | 1986-12-05 | 1989-03-14 | Bruno Dubost | Method of heat treatment of Al-based alloys containing Li and the product obtained by the method |
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 |
EP0325937B1 (en) * | 1988-01-28 | 1994-03-09 | Aluminum Company Of America | Aluminum-lithium 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 |
US5259897A (en) * | 1988-08-18 | 1993-11-09 | Martin Marietta Corporation | Ultrahigh strength Al-Cu-Li-Mg alloys |
US5455003A (en) * | 1988-08-18 | 1995-10-03 | Martin Marietta Corporation | Al-Cu-Li alloys with improved cryogenic fracture toughness |
US5462712A (en) * | 1988-08-18 | 1995-10-31 | Martin Marietta Corporation | High strength Al-Cu-Li-Zn-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 |
US5076859A (en) * | 1989-12-26 | 1991-12-31 | Aluminum Company Of America | Heat treatment of aluminum-lithium 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 |
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 |
EP0996755B1 (en) | 1997-02-24 | 2002-10-02 | QinetiQ Limited | Aluminium-lithium alloys |
EP2231888B1 (en) | 2007-12-04 | 2014-08-06 | Alcoa Inc. | Improved aluminum-copper-lithium alloys |
US8261567B2 (en) | 2009-06-23 | 2012-09-11 | Hussmann Corporation | Heat exchanger coil with wing tube profile for a refrigerated merchandiser |
RU2468114C1 (ru) * | 2011-11-30 | 2012-11-27 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Белгородский государственный национальный исследовательский университет" | Способ получения сверхпластичного листа из алюминиевого сплава системы алюминий-литий-магний |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1148719A (fr) * | 1955-04-05 | 1957-12-13 | Stone & Company Charlton Ltd J | Perfectionnements aux alliages à base d'aluminium |
US2915390A (en) * | 1958-01-13 | 1959-12-01 | Aluminum Co Of America | Aluminum base alloy |
FR1519021A (fr) * | 1967-03-07 | 1968-03-29 | Iosif Naumovich Fridlyander Ni | Alliage à base d'aluminium |
DE3366165D1 (en) * | 1982-02-26 | 1986-10-23 | Secr Defence Brit | Improvements in or relating to aluminium alloys |
US4526630A (en) * | 1982-03-31 | 1985-07-02 | Alcan International Limited | Heat treatment of aluminium alloys |
FR2529909B1 (fr) * | 1982-07-06 | 1986-12-12 | Centre Nat Rech Scient | Alliages amorphes ou microcristallins a base d'aluminium |
US4735774A (en) * | 1983-12-30 | 1988-04-05 | The Boeing Company | Aluminum-lithium alloy (4) |
DE3486352T2 (de) * | 1983-12-30 | 1995-04-20 | Aluminum Co Of America | Aluminium-Lithium-Legierung. |
US4603029A (en) * | 1983-12-30 | 1986-07-29 | The Boeing Company | Aluminum-lithium alloy |
-
1984
- 1984-03-15 FR FR8404483A patent/FR2561260B1/fr not_active Expired - Fee Related
-
1985
- 1985-03-11 ES ES541151A patent/ES541151A0/es active Granted
- 1985-03-12 CA CA000476314A patent/CA1287508C/fr not_active Expired - Fee Related
- 1985-03-13 EP EP85420043A patent/EP0158571B1/fr not_active Expired
- 1985-03-13 DE DE8585420043T patent/DE3560729D1/de not_active Expired
- 1985-03-13 JP JP60050241A patent/JPS60215734A/ja active Granted
- 1985-03-14 BR BR8501144A patent/BR8501144A/pt unknown
- 1985-03-14 IL IL74604A patent/IL74604A/xx unknown
-
1988
- 1988-02-16 US US07/158,048 patent/US4840683A/en not_active Expired - Fee Related
- 1988-04-27 JP JP63105375A patent/JPS63286557A/ja active Pending
Non-Patent Citations (1)
Title |
---|
METAL SCIENCE JOURNAL 1972, vol.6, p.167, B.NOBLE et al.: "T1 (Al2CuLi) Precipitation in Aluminium -Copper-Lithium-Alloys" * |
Also Published As
Publication number | Publication date |
---|---|
BR8501144A (pt) | 1985-11-12 |
FR2561260A1 (fr) | 1985-09-20 |
EP0158571A1 (fr) | 1985-10-16 |
JPH0372147B2 (pt) | 1991-11-15 |
JPS63286557A (ja) | 1988-11-24 |
CA1287508C (fr) | 1991-08-13 |
US4840683A (en) | 1989-06-20 |
ES8602959A1 (es) | 1985-12-01 |
IL74604A0 (en) | 1985-06-30 |
FR2561260B1 (fr) | 1992-07-17 |
DE3560729D1 (en) | 1987-11-05 |
JPS60215734A (ja) | 1985-10-29 |
ES541151A0 (es) | 1985-12-01 |
IL74604A (en) | 1988-11-15 |
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