EP0208631B1 - Aluminiumlegierungen mit hohem Lithium- und Siliziumgehalt und Verfahren zu ihrer Herstellung - Google Patents

Aluminiumlegierungen mit hohem Lithium- und Siliziumgehalt und Verfahren zu ihrer Herstellung Download PDF

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Publication number
EP0208631B1
EP0208631B1 EP86420166A EP86420166A EP0208631B1 EP 0208631 B1 EP0208631 B1 EP 0208631B1 EP 86420166 A EP86420166 A EP 86420166A EP 86420166 A EP86420166 A EP 86420166A EP 0208631 B1 EP0208631 B1 EP 0208631B1
Authority
EP
European Patent Office
Prior art keywords
phase
alloy
alloys
hot
solidification
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
Application number
EP86420166A
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English (en)
French (fr)
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EP0208631A1 (de
Inventor
Bruno Dubost
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
Original Assignee
Cegedur Societe de Transformation de lAluminium Pechiney 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
Application filed by Cegedur Societe de Transformation de lAluminium Pechiney SA filed Critical Cegedur Societe de Transformation de lAluminium Pechiney SA
Priority to AT86420166T priority Critical patent/ATE45189T1/de
Publication of EP0208631A1 publication Critical patent/EP0208631A1/de
Application granted granted Critical
Publication of EP0208631B1 publication Critical patent/EP0208631B1/de
Expired legal-status Critical Current

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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
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04—Modified aluminium-silicon alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0408—Light metal alloys
    • C22C1/0416—Aluminium-based alloys
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting

Definitions

  • the field of the invention relates to Al-based alloys relating to high contents of Li and Si and having a high to medium mechanical strength, a very low density and a high Young modulus; a process for obtaining it uses rapid solidification (atomization, hyper quenching on a metal substrate, etc.) densification and hot shaping.
  • metallurgists have proposed additions of a few% of hardening elements such as Cu, Mg, Zn and other minor elements controlling the recrystallization or the grain size of the alloy, such as Mn, Cr, Ti, etc ...
  • These alloys also contain very low Fe and Si contents (less than 0.1% by weight).
  • Swiss patent CH-216 204 discloses AI-Li-Si alloys containing from 1 to 10% (by weight) of Li and Si (in undetermined amount); the example given relates to an alloy containing: 3.5% Li; 5% If; 1 ° / o Cu; 1% Ni; remains AI. However, this alloy, most probably obtained by conventional casting, probably has a low heat stability, unlike the alloys according to the invention.
  • the Applicant has found that it is possible to obtain gains in specific modulus much greater than 25 ° / o on AI-Li-Si alloys containing large amounts of Si and Li, while retaining acceptable mechanical characteristics, satisfactory spontaneous corrosion resistance, and good formability.
  • This objective is achieved by the choice of a specific composition, the use of rapid solidification and techniques of powder metallurgy, and finally a shaping at controlled temperature.
  • the Li content is preferably kept between 4 and 7%.
  • the total content of secondary elements is preferably kept below 2% .
  • the properties of the products obtained are only satisfactory if the alloys are produced by rapid solidification at cooling rates from the liquid state above 1000 ° C / sec. by any known means (solidification on a wheel, atomization, etc.).
  • This operation preferably takes place under an inert atmosphere, for example argon or helium.
  • the alloys thus obtained are then consolidated by known techniques of powder metallurgy, for example according to the range: possible grinding, cold compaction, degassing under possible vacuum, hot compression and drawing by spinning, forging, stamping or any other technique. , with a rate of wrought (section initial cross-section / final cross-section) generally greater than 8.
  • the product temperature must remain below 400 ° C, and preferably 350 ° C, to obtain acceptable mechanical characteristics.
  • the products are generally used, as indicated, in the raw state of hot transformation, or after a slight additional deformation at a lower temperature, which makes it possible to improve both the flatness, the straightness or the dimensional tolerances and the mechanical resistance characteristics.
  • the products thus obtained have a large volume fraction, between 15 and 60%, preferably between 20 and 50%, of particles essentially consisting of a phase of cubic structure, with a parameter close to 0 , 59 at 0.60 nm, identified as phase T - AI2 Li 3 Si 2 or AI Li Si, according to the authors.
  • This phase distributed homogeneously, has a size of between 0.01 to 10 ⁇ m, more generally between 0.01 and 5 ⁇ m: it is believed that this phase contributes to cold hardening and to the average temperatures of the alloy, its fine and homogeneous precipitation being accentuated by an income between room temperature and 350 ° C, preferably between 150 and 250 ° C.
  • the microstructure may optionally include a very fine globular precipitation of phase 8 '(AI 3 Li) whose diameter is less than 50 nm and also a slight precipitation of free Si or phase 8 AI Li.
  • phase 8 represents less than 10% (by volume).
  • the products thus obtained are characterized by an extremely fine grain whose size is less than 20 ⁇ m, and generally less than 10 ⁇ m.
  • phase 8 AI Li which is spontaneously corrodible and also of phase phase 'AI 3 Li weakening is favored.
  • the Applicant has on the other hand, found that for an equal composition, the hardness of the products is all the higher the smaller the size of the T phase particles (AI, Li, Si); in particular the very rapid solidification of the thin ribbons (20 to 30 ⁇ m thick) on a metallic substrate ("melt spinning") leads, on the substrate side, to T-phase particle sizes of 0.01 to 0.5 ⁇ m.
  • microhardness is then approximately 40% greater than that obtained on the external face of the thicker ribbons or on powders obtained by atomization, for which the size of particles of phase T is of the order of 0.5 to 5 ⁇ m.
  • Alloys the composition of which is given in Table 1, were obtained in the form of powder, by centrifugal spraying with helium, the latter being sieved to 200 ⁇ m maximum.
  • These powders were made from cast ingots, made with a pure base having an Fe content ⁇ 0.05%.
  • the bars obtained were air-cooled, and characterized by density measurement, Young's modulus, tensile tests (long sense) and micrographic examinations.
  • Table I brings together the targeted chemical compositions determined by atomic absorption and the results obtained (average of 5 tests).
  • the oxygen content is around 0.5%.
  • phase T present was coarse (average size 2 ⁇ m, maximum size 5 ⁇ m), but homogeneously dispersed except for a few large particles of phase T (100 to 200 ⁇ m) whose presence explains the low elongations observed (primers premature rupture).
  • Alloys AI, Li, Si including the compositions given in Example 1 were cast in strips of 10 mm x 40 ⁇ m approximately, of cross section, on a copper wheel 0 480 mm rotating at 1000 rpm, since 730 to 830 ° C; they were characterized by Vickers microhardness under 10 g micrographic examination by optical microscopy, electron and X-ray diffraction in the raw casting state, and after heat treatment of tempering from 1 to 10 h between 200 and 350 ° C, to evaluate hot stability and structural evolution.
  • the external part of the ribbons B, C, D and the entire thickness of the ribbons (E, F) had a coarse structure of the order of 1 ⁇ m on average (maximum size of 4 ⁇ m) in the raw state of casting and after income.
  • the volume fraction of the precipitates did not vary significantly during the incomes.
  • the hardness increases with the contents of Li and Si, and the volume fraction of phase T, at least as long as the latter remains in the form of fine particles.
  • the fine structures give the alloys according to the invention a very high level of hardness after tempering at 200 ° C, and this remains high even after tempering at 350 ° C, unlike the alloys outside the invention.
  • phase T very coarse particles of phase T (AI, Li, Si, of very heterogeneous sizes, rather coarse, of several ⁇ m to several hundreds of ⁇ m, and clearly higher than 10 ⁇ m on average, associated with a small amount of phase 8 AI Li.
  • This example shows the need to use a method involving rapid solidification for the alloys according to the invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Silicon Compounds (AREA)
  • Conductive Materials (AREA)
  • Powder Metallurgy (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Materials For Medical Uses (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Ceramic Products (AREA)

Claims (12)

1. Legierung auf AI-Basis, die Li und Si enthält und durch rasche Erstarrung erhalten worden ist, dadurch gekennzeichnet,
daß sie (in Gew.-%) enthält:
3,6 bis 8 % Li
5 bis 14 % Si
0 bis 1 % jedes der Elemente
Fe, Co, Ni, Cr, Mn, Zr, V, Ti, Nb, Mo, 02, Sc,
0 bis 2 % Cu und/oder Mg und/oder Zn,

wobei die Gesamtmenge dieser wahlweisen sekundären Elemente unter 5 % ist, und der Rest aus AI und Verunreinigungen (jede ≤ 0,05 %, insgesamt < 0,15 %) besteht,
und daß die Erstarrungsgeschwindigkeit aus dem flüssigen Zustand über 1000° C/s ist.
2. Legierung nach dem Anspruch 1,
dadurch gekennzeichnet,
daß die Gehalte an Li und Si durch die Beziehung:
% Li = 0,4 % Si + k
mit -1 ≤ k ≤ 5

verknüpft sind.
3. Legierung nach dem Anspruch 2,
dadurch gekenenzeichnet,
daß0≤k≤4.
4. Legierung nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß sie 4 bis 7 % Li enthält.
5. Legierung nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß die Gesamtmenge an wahlweisen sekundären Elementen 2 % nicht übersteigt.
6. Halbzeugprodukt einer Zusammensetzung gemäß einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß es 15 bis 60 Vol.-% T-Phase enthält.
7. Produkt nach dem Anspruch 6,
dadurch gekennzeichnet,
daß es 20 bis 50 Vol.-% T-Phase enthält.
8. Produkt nach einem der Ansprüche 6 oder 7,
dadurch gekennzeichnet,
daß die Größe der T-Teilchen im Bereich von 0,01 bis 10 um (und vorzugsweise von 0,01 bis 5 µm) liegt.
9. Produkt nach einem der Ansprüche 6 bis 8,
dadurch gekennzeichnet,
daß die Korngröße der Legierung unter 20 µm (und vorzugsweise 10 µm) ist.
10. Verfahren zur Herstellung einer Legierung oder eines Produkts nach einem der Ansprüche 1 bis 9, das ein Schmelzen, die Erstarrung, ein eventuelles Zerkleinern, eine Kompression und ein Durchkneten in der Wärme aufweist,
dadurch gekennzeichnet,
daß alle Warmarbeitsgänge nach der Erstarrung bei einer Temperatur unter 400° C (und vorzugsweise 350" C) stattfinden.
11. Verfahren nach dem Anspruch 10,
dadurch gekennzeichnet,
daß das Durchkneten in der Wärme durch eine leichte Verformung bei niedrigerer Temperatur vervollständigt wird.
12. Verfahren nach einem der Ansprüche 10 oder 11,
dadurch gekennzeichnet,
daß man ein Anlassen zwischen 20 und 350°C und vorzugsweise 150 und 250°C nach Verformung in der Wärme oder in der Kälte anwendet.
EP86420166A 1985-06-28 1986-06-25 Aluminiumlegierungen mit hohem Lithium- und Siliziumgehalt und Verfahren zu ihrer Herstellung Expired EP0208631B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86420166T ATE45189T1 (de) 1985-06-28 1986-06-25 Aluminiumlegierungen mit hohem lithium- und siliziumgehalt und verfahren zu ihrer herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8510375A FR2584095A1 (fr) 1985-06-28 1985-06-28 Alliages d'al a hautes teneurs en li et si et un procede de fabrication
FR8510375 1985-06-28

Publications (2)

Publication Number Publication Date
EP0208631A1 EP0208631A1 (de) 1987-01-14
EP0208631B1 true EP0208631B1 (de) 1989-08-02

Family

ID=9321039

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86420166A Expired EP0208631B1 (de) 1985-06-28 1986-06-25 Aluminiumlegierungen mit hohem Lithium- und Siliziumgehalt und Verfahren zu ihrer Herstellung

Country Status (10)

Country Link
US (1) US4804423A (de)
EP (1) EP0208631B1 (de)
JP (1) JPS627828A (de)
AT (1) ATE45189T1 (de)
BR (1) BR8602980A (de)
CA (1) CA1274107A (de)
DE (1) DE3664789D1 (de)
ES (1) ES2000175A6 (de)
FR (1) FR2584095A1 (de)
IL (1) IL79198A0 (de)

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Publication number Priority date Publication date Assignee Title
US4758273A (en) * 1984-10-23 1988-07-19 Inco Alloys International, Inc. Dispersion strengthened aluminum alloys
GB2196647A (en) * 1986-10-21 1988-05-05 Secr Defence Rapid solidification route aluminium alloys
FR2626009B2 (fr) * 1987-02-18 1992-05-29 Cegedur Produit en alliage d'al contenant du li resistant a la corrosion sous tension
FR2637914B1 (fr) * 1988-10-17 1992-12-18 Pechiney Rhenalu Procede permettant de diminuer le taux de recristallisation de l'aluminium et de ses alliages
US5091019A (en) * 1990-02-12 1992-02-25 Allied-Signal, Inc. Rapidly solidified aluminum lithium alloys having zirconium
US5045125A (en) * 1990-04-02 1991-09-03 Allied-Signal Inc. Case toughening of aluminum-lithium forgings
JP2965774B2 (ja) * 1992-02-13 1999-10-18 ワイケイケイ株式会社 高強度耐摩耗性アルミニウム合金
JP2954775B2 (ja) * 1992-02-14 1999-09-27 ワイケイケイ株式会社 微細結晶組織からなる高強度急冷凝固合金
JP2911673B2 (ja) * 1992-03-18 1999-06-23 健 増本 高強度アルミニウム合金
JP2002144018A (ja) * 2000-11-02 2002-05-21 Yorozu Corp 軽量高強度部材の製造方法
JP2004204836A (ja) * 2002-12-13 2004-07-22 Sanyo Electric Co Ltd 電弧溶接により組み立てられるアルミニウム部材及び圧縮機
US8409373B2 (en) 2008-04-18 2013-04-02 United Technologies Corporation L12 aluminum alloys with bimodal and trimodal distribution
US8002912B2 (en) 2008-04-18 2011-08-23 United Technologies Corporation High strength L12 aluminum alloys
US20090260724A1 (en) * 2008-04-18 2009-10-22 United Technologies Corporation Heat treatable L12 aluminum alloys
US7879162B2 (en) 2008-04-18 2011-02-01 United Technologies Corporation High strength aluminum alloys with L12 precipitates
US7875131B2 (en) 2008-04-18 2011-01-25 United Technologies Corporation L12 strengthened amorphous aluminum alloys
US7871477B2 (en) 2008-04-18 2011-01-18 United Technologies Corporation High strength L12 aluminum alloys
US7811395B2 (en) 2008-04-18 2010-10-12 United Technologies Corporation High strength L12 aluminum alloys
US8017072B2 (en) 2008-04-18 2011-09-13 United Technologies Corporation Dispersion strengthened L12 aluminum alloys
US7875133B2 (en) 2008-04-18 2011-01-25 United Technologies Corporation Heat treatable L12 aluminum alloys
US8778099B2 (en) 2008-12-09 2014-07-15 United Technologies Corporation Conversion process for heat treatable L12 aluminum alloys
US9611522B2 (en) 2009-05-06 2017-04-04 United Technologies Corporation Spray deposition of L12 aluminum alloys
US9127334B2 (en) 2009-05-07 2015-09-08 United Technologies Corporation Direct forging and rolling of L12 aluminum alloys for armor applications
US8728389B2 (en) 2009-09-01 2014-05-20 United Technologies Corporation Fabrication of L12 aluminum alloy tanks and other vessels by roll forming, spin forming, and friction stir welding
US8409496B2 (en) 2009-09-14 2013-04-02 United Technologies Corporation Superplastic forming high strength L12 aluminum alloys
US9194027B2 (en) 2009-10-14 2015-11-24 United Technologies Corporation Method of forming high strength aluminum alloy parts containing L12 intermetallic dispersoids by ring rolling
US8409497B2 (en) 2009-10-16 2013-04-02 United Technologies Corporation Hot and cold rolling high strength L12 aluminum alloys
CN109423564A (zh) * 2017-08-28 2019-03-05 昭和电工株式会社 磁记录介质用铝合金基板、磁记录介质用基板、磁记录介质和硬盘驱动器
CN107699747B (zh) * 2017-09-26 2019-05-21 沈阳航空航天大学 一种高Cu含量Al-Si-Li-Cu铸造合金及其制备方法
CN107587012B (zh) * 2017-09-26 2019-04-23 沈阳航空航天大学 一种轻质铸造Al-Si-Li合金材料及其制备方法
CN107675038B (zh) * 2017-09-26 2019-04-23 沈阳航空航天大学 一种轻质铸造Al-Si-Li-Cu合金材料及其制备方法
WO2019161137A1 (en) * 2018-02-14 2019-08-22 Arconic Inc. Aluminum alloy products and methods for producing the same
CN114058912B (zh) * 2022-01-17 2022-04-08 北京理工大学 一种高比强度、比刚度铝锂合金厚壁环形件及其制备方法
US11739395B1 (en) * 2022-05-05 2023-08-29 The United States Of America As Represented By The Secretary Of The Navy Embrittled aluminum alloys for powder manufacturing

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CH216204A (de) * 1937-10-29 1941-08-15 Kommanditgesellschaft Mahle Aluminium-Legierung, insbesondere für Kolben von Brennkraftmaschinen.
FR1148719A (fr) * 1955-04-05 1957-12-13 Stone & Company Charlton Ltd J Perfectionnements aux alliages à base d'aluminium
FR2555610B1 (fr) * 1983-11-29 1987-10-16 Cegedur Alliages a base d'aluminium presentant une grande stabilite a chaud
US4661172A (en) * 1984-02-29 1987-04-28 Allied Corporation Low density aluminum alloys and method

Also Published As

Publication number Publication date
US4804423A (en) 1989-02-14
IL79198A0 (en) 1986-09-30
CA1274107A (fr) 1990-09-18
ATE45189T1 (de) 1989-08-15
DE3664789D1 (en) 1989-09-07
BR8602980A (pt) 1987-02-17
EP0208631A1 (de) 1987-01-14
JPS627828A (ja) 1987-01-14
JPH0328500B2 (de) 1991-04-19
FR2584095A1 (fr) 1987-01-02
ES2000175A6 (es) 1988-01-01

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