EP0562984A1 - Verformbares Dünnblech aus Aluminium-Legierung mit einer feinen und homogenen Mikrostruktur und einer hohen Elastizitätsgrenze - Google Patents

Verformbares Dünnblech aus Aluminium-Legierung mit einer feinen und homogenen Mikrostruktur und einer hohen Elastizitätsgrenze Download PDF

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Publication number
EP0562984A1
EP0562984A1 EP93420133A EP93420133A EP0562984A1 EP 0562984 A1 EP0562984 A1 EP 0562984A1 EP 93420133 A EP93420133 A EP 93420133A EP 93420133 A EP93420133 A EP 93420133A EP 0562984 A1 EP0562984 A1 EP 0562984A1
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EP
European Patent Office
Prior art keywords
alloy
sheet according
sheet
group
iron
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.)
Ceased
Application number
EP93420133A
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English (en)
French (fr)
Inventor
Guy-Michel Raynaud
Bernard Grange
Jean-Marc Legresy
Denis Bechet
Philippe Solignac
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.)
Pechiney Recherche GIE
Original Assignee
Pechiney Recherche GIE
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 Pechiney Recherche GIE filed Critical Pechiney Recherche GIE
Publication of EP0562984A1 publication Critical patent/EP0562984A1/de
Ceased legal-status Critical Current

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    • 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
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/026—Alloys based on aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0611—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a single casting wheel, e.g. for casting amorphous metal strips or wires

Definitions

  • the invention relates to thin sheets of aluminum alloy which may have a high content of additives and have a fine and homogeneous structure as well as a high elastic limit, good mechanical strength and suitable elongation, which more specifically intended for the manufacture of packaging.
  • hypoeutectic compositions the successive formation of aluminum crystals is obtained, then of said eutectic particles constituted by a mixture of aluminum crystals and crystals, either of the addition element as in the case of silicon is an intermetallic compound resulting from the reaction of one or more elements between them or with aluminum as in the case of iron or copper and silicon, the said eutectics being precipitated in the matrix of aluminum.
  • compositions with a high content of additive elements called hypereutectics
  • the solidification of the alloy gives rise to the initial formation of primary particles constituted by the additive element or an intermetallic compound before the appearance of the eutectic structure.
  • these particles are relatively coarse (> 40 micrometers for an alloy containing more than 1.3% of iron), in particular when they occupy a large volume fraction, and form as many microsegregations which interfere with obtaining suitable mechanical properties.
  • this type of casting leads to a so-called cortical segregation, that is to say to the formation at the periphery of the cast product of a zone richer in addition elements which constitutes a macroseggregation also harmful to the mechanical characteristics. of the alloy.
  • this process provides products of large dimensions which, to be transformed into sheets, must undergo rolling operations either hot or cold and which are generally separated by heat treatment steps. As many operations which severely burden the cost price of the sheets obtained.
  • alloys which lend themselves to such a treatment, mention may be made, for example, of alloys of the AlMgSi, AlCuMg, AlZnMg and AlZnMgCu type.
  • the particles have the form of elongated rods which must be fragmented by rolling to obtain particles of suitable dimensions.
  • casting between rolls has the disadvantage of leading to sheets having a central segregation and therefore to a heterogeneity detrimental to obtaining good mechanical characteristics throughout the thickness of the sheet.
  • the invention relates to an aluminum alloy sheet, of thickness between 0.1 and 3 mm, suitable for deformation, obtained by developing said alloy from first or second electrolytic aluminum then, poured onto a cooled metal surface running at a speed greater than 0.1 m / s, characterized in that it contains at least one addition element belonging to the group consisting of iron with a weight content of between 0.9 and 3 %, nickel between 0.05 and 8%, manganese between 1.6 and 3% and silicon between 0.9 and 14%, the said elements being present in the simple state or combined to form with each other or with aluminum at least partially an intermetallic compound and appearing in the form of particles whose dimensions are between 0.05 and 2 micrometers and are dispersed homogeneously throughout the thickness of the sheet.
  • the said strip can be used as it is or cold rolled without any other heat treatment than a final annealing so that most of the addition elements remain in solid solution, which makes it easier to control the recrystallization and the maintenance in the final sheet of a fine and homogeneous structure.
  • the intermetallic compounds present in the leaves belong to the group consisting of Al3Fe, Al6Mn, Al3Ni, AlFeSi, AlMnSi, Al6 (Fe, Mn), Al9 (Fe, Ni) , AI (Fe, Mn) Si, Mg2Si which have favorable mechanical characteristics with regard to formability and seizure problems in particular.
  • Sheets consisting of Al (Fe, Mn) Si alloys are particularly suitable for the invention.
  • the maximum weight content of iron is such that Fe + 1.33 Mn is less than 4%, value beyond which there is appearance of primary intermetallic particles detrimental to formability.
  • the maximum iron content by weight is such that Fe + 0.24 Si ⁇ 4.2%.
  • the invention also relates to sheets which, in addition to iron, nickel, manganese and silicon, contain other additives capable of forming dispersoids such as chromium, titanium and zirconium up to respective weight contents of 0.5%, 0.2% and 0.15% and whose dimensions are between 0.005 and 0.5 micrometers. These elements also make it possible to improve the mechanical properties of the sheets.
  • the invention also includes sheets which contain at least one other element belonging to the group consisting of magnesium and copper, the said elements being present at respective maximum contents of 5% and 6% and at least partially in the form solid solution.
  • the invention also relates to a method for manufacturing sheets as described above.
  • Said molten alloy is then cast in the form of a strip on a mobile surface cooled according to the technique called in English language: "melt overflow" described, for example, in French patent n ° 426993.
  • the sheet obtained is usable directly without any mechanical treatment such as rolling or heat treatment such as annealing.
  • the strip can be cooled to ambient temperature and laminated directly without any intermediate treatment.
  • the sheet obtained is subjected to heating in a temperature range between 250 ° C and 500 ° C for 1 to 2 hours.
  • the concentration in solid solution of the alloying elements such as iron in particular is such that it blocks any recrystallization and consequently, a fine structure is maintained and the sheet retains its good mechanical properties.
  • Sheets with an average thickness of 30 micrometers of 8011 type alloy were manufactured according to the standards of the Aluminum Association, that is to say which contained by weight: 0.9% of silicon and 1% of iron as main elements of addition.
  • the conventional casting method was used, the method of casting between rolls and the method according to the invention.
  • the micrographs at 1000 magnification of the sheets obtained were reproduced in Figures 1, 2 and 3 respectively. It can be seen in FIG. 1, the presence of large Al3Fe intermetallic particles; in Figure 2, the particles are smaller but, we can see a heterogeneous area due to central segregation; on the other hand, in FIG. 3, the particles are fine and evenly distributed.
  • the sheet from the casting between rolls could not be laminated below 50 micrometers.
  • the sheets obtained in each of the three cases were subjected to a marbling examination: the number of holes noted per m2 was respectively: 120, 1500 and 90; which shows that the quality of the sheet according to the invention is clearly superior to that of the other methods.
  • the tensile strength Rm and the elongation A were measured on the sheets obtained by conventional casting and according to the invention, and the following values were noted respectively: Rm: 80 and 120 MPa; A: 10 and 12%.
  • Sheets of AlFeSi, AlMnSi, AlMnMgSi, AlMgMn, AlMgMnFe, AlMgFe, AlMgFeCr, AlNiMg and AlSiCu containing different proportions of alloying elements obtained according to the invention from a strip of thickness E 0.8 mm, have have been cold rolled to thicknesses of 0.25 or 0.1 mm and then subjected or not to a final or intermediate annealing treatment.
  • the present invention finds its application in the manufacture of thin sheets intended more particularly for making trays, boxes, lids and also bodywork elements by deep drawing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP93420133A 1992-03-26 1993-03-24 Verformbares Dünnblech aus Aluminium-Legierung mit einer feinen und homogenen Mikrostruktur und einer hohen Elastizitätsgrenze Ceased EP0562984A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9204259 1992-03-26
FR9204259A FR2689141B1 (fr) 1992-03-26 1992-03-26 Feuille mince, déformable, en alliage d'aluminium à structure fine et homogène ayant une limite élastique élevée.

Publications (1)

Publication Number Publication Date
EP0562984A1 true EP0562984A1 (de) 1993-09-29

Family

ID=9428599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93420133A Ceased EP0562984A1 (de) 1992-03-26 1993-03-24 Verformbares Dünnblech aus Aluminium-Legierung mit einer feinen und homogenen Mikrostruktur und einer hohen Elastizitätsgrenze

Country Status (7)

Country Link
EP (1) EP0562984A1 (de)
BR (1) BR9301289A (de)
CA (1) CA2091390A1 (de)
FR (1) FR2689141B1 (de)
HU (1) HUT65001A (de)
MX (1) MX9301652A (de)
NO (1) NO931007L (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2138031A1 (de) * 1971-05-18 1972-12-29 Alcan Res & Dev
FR2291285A1 (fr) * 1974-11-15 1976-06-11 Alcan Res & Dev Procede de fabrication de produits ameliores d'alliages metalliques
WO1987004377A1 (en) * 1986-01-23 1987-07-30 Federal-Mogul Corporation Engine bearing alloy composition and method of making same
EP0470913A1 (de) * 1990-08-08 1992-02-12 Pechiney Rhenalu Verfahren zur Dickenkontrolle eines metallischen Stranggussbandes auf einer Walze

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2138031A1 (de) * 1971-05-18 1972-12-29 Alcan Res & Dev
FR2291285A1 (fr) * 1974-11-15 1976-06-11 Alcan Res & Dev Procede de fabrication de produits ameliores d'alliages metalliques
WO1987004377A1 (en) * 1986-01-23 1987-07-30 Federal-Mogul Corporation Engine bearing alloy composition and method of making same
EP0470913A1 (de) * 1990-08-08 1992-02-12 Pechiney Rhenalu Verfahren zur Dickenkontrolle eines metallischen Stranggussbandes auf einer Walze

Also Published As

Publication number Publication date
FR2689141B1 (fr) 1995-02-17
BR9301289A (pt) 1993-09-28
HUT65001A (en) 1994-03-28
NO931007D0 (no) 1993-03-19
CA2091390A1 (fr) 1993-09-27
MX9301652A (es) 1994-01-31
NO931007L (no) 1993-09-27
FR2689141A1 (fr) 1993-10-01
HU9300865D0 (en) 1993-06-28

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