EP0327556B1 - Alliages a base d'aluminium contenant du lithium obtenus par voie de solidification rapide - Google Patents

Alliages a base d'aluminium contenant du lithium obtenus par voie de solidification rapide Download PDF

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Publication number
EP0327556B1
EP0327556B1 EP87906835A EP87906835A EP0327556B1 EP 0327556 B1 EP0327556 B1 EP 0327556B1 EP 87906835 A EP87906835 A EP 87906835A EP 87906835 A EP87906835 A EP 87906835A EP 0327556 B1 EP0327556 B1 EP 0327556B1
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EP
European Patent Office
Prior art keywords
alloy
lithium
percent
proportions
aluminium
Prior art date
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Expired - Lifetime
Application number
EP87906835A
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German (de)
English (en)
Other versions
EP0327556A1 (fr
Inventor
Edward Jones
Panayiotis Tsakiropoulos
Charles Robert Pratt
Robert William Gardiner
James Edward Restall
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.)
Qinetiq Ltd
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UK Secretary of State for Defence
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Publication date
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C45/00—Amorphous alloys
    • C22C45/08—Amorphous alloys with aluminium as the major constituent

Definitions

  • This invention relates to aluminium based alloys containing lithium, made by the rapid solidification rate (RSR) route.
  • RSR rapid solidification rate
  • This invention concerns especially the dispersoid phase aspect of the RSR route aluminium-lithium art.
  • Several dispersoid-forming additions have been investigated previously.
  • One prior art investigation looked at the effects of 0.2 to 0.6 weight percent additions of manganese, chromium, iron, cobalt, titanium and zirconium on an aluminium - 3 weight percent lithium alloy.
  • Other additions which we know to have been investigated previously are as follows (all proportions in weight percent): 1 to 7 silicon; 0.2 titanium; 0.4 chromium; 0.2 to 3 manganese; 0.5 iron; 0.2 to 1 cobalt; 0.04 yttrium, and 0.2 to 1 zirconium.
  • the problem is one of developing a RSR route aluminium-lithium alloy having a good balance of those properties desirable especially for aerospace structural application, such desirable properties including strength, high modulus, ductility and fracture toughness together with low density; and the present invention tackles this problem by providing new additives for such alloys, that resist coarsening in the aluminium-base matrix at elevated temperatures of the level that is likely to be experienced in solution treatment, in artificial ageing or in service.
  • the invention comprises an alloy formed by a rapid solidification rate process comprising the following ingredients in proportions by weight: Li 1 - 5% one or more of the following refractory elements within the individual proportions stated below and in total proportion not exceeding 5% when present in combination Nb 0.2 - 5.3% Mo 0.2 - 5.0% Hf 0.2 - 5.0% Ta 0.2 - 5.0% W 1.0 - 5.0% with Al as balance save for incidental impurities and save for 5% in total of one or more of the following conventional strengthening ingredients within the individual proportions stated: Cu 0 - 5% Mg 0 - 5% Zn 0 - 5%
  • RSR methods well established in the art are suitable for the practice of the invention.
  • RSR methods possess in common the imposition of a high cooling rate on an alloy from the liquid.
  • RSR methods such as melt spraying, chill methods and weld methods are described in some depth in Rapid Solidification of Metals and Alloys by H Jones (published as Monograph No 8 by The Institution of Metallurgists) and in many other texts.
  • the various RS routes differ from one another in their abilities in regard to control of cooling rate. The degree fo dispersoid refinement and the extension of solid solubility are dependent on the rate of cooling from the melt.
  • the alloy may contain an ingredient or ingredients other than aluminium, lithium, and X such as those common in aluminium-lithium alloys, eg copper magnesium or zinc.
  • the alloy is exemplified by reference to the specific compositions given in Tables 1 2 and 3 are for the alloys when produced as RSR splats within an argon atmosphere by the twin piston technique.
  • the splats produced were typically around 50um thick and the cooling rate developed by the RSR process was of the order of 105 to 106degrees Celcius per second.
  • the recorded compositions shown in the first column of Tables 1 and 2 represent the measured composition of the source ingot. This will correspond closely to the composition of the splat at all times in the tests documented save in respect of the lithium content.
  • the measured lithium content for most of the splats is given in parenthesis adjacent the relevent microhardness entry.
  • Table 1 below gives measurements fo microhardness (expressed in kg/mm2) as a function of time of exposure at 540 degrees Celcius this being a temperature representative of a solution treatment regime.
  • the specimens were encapsulated prior to exposure within a quartz enclosure filled with argon. At completion of the exposure period the specimens were removed from the encapsulation and water-quenched to room temperature. Tantalum containing alloys are not documented in the quoted figures but are expected to have comparable properties.
  • Table 2 below documents variations in microhardness and lithium content for a test similar to that in Table 1 save that it was conducted at a temperature of 160 degrees Celcius which is a temperature representative fo artificial ageing conditions.
  • specimens (those indicated) were subjected to a solution treatment fo 1 hour at 540 degrees Celcius followed by water-quenching to room temperature prior to ageing. The remainder were subjected to the ageing treatment from the 'as-splatted' condition.
  • Table 3 below documents one comparative test of an alloy of the invention against a reference alloy.
  • the aluminium - 4 lithium - 0.6 molybdenum alloy was produced as RSR powder by inert gas atomising.
  • the powder was canned and then extruded (without the usual intermediate degassing treatment) to round bar at a 25:1 reduction ratio.
  • the extruded bar was solution treated at 540 degrees Celcius for one hour, water quenched, then aged for one hour at 160 degrees Celcius.
  • the comparitive data relates to a comparable prior art alloy and the figures given are taken from a published work - a paper by P J Meschter et al at page 85 et seq of Aluminium-Lithium III (the proceedings of the Third International Aluminium-Lithium Conference) published by The Institute of Metals.
  • the data given is for a alloy of aluminium - 4 lithium - 0.2 zirconium extruded from RSR powder, solution treated at 588 degrees Celcius then aged for one hour at 160 degrees Celcius.
  • the alloy of the invention is not limited to an aluminium - lithium - X system for it is possible that additions other than lithium and X will be incorporated within the aluminium base in order to yield a material having a better blend of properties than can be secured through a ternary alloy. It is postulated that the alloy could include up to 5 percent or thereabouts of one or more ingredients selected from the group consisting of copper zinc and magnesium.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (5)

1. Alliage formé par un procédé de solidification rapide, comprenant les constituants suivants en les proportions pondérales suivantes :
   Li 1 - 5%
un ou plusieurs des éléments réfractaires suivants, en les proportions individuelles ci-après et en proportion totale n'excédent pas 5% lorsqu'ils sont présents en combinaison
   Nb 0,2 - 5,3%
   Mo 0,2 - 5,0%
   Hf 0,2 - 5,0%
   Ta 0,2 - 5,0%
   W 1,0 - 5,0%
et Al pour le reste, sauf les impuretés accidentelles et sauf jusqu'à 5% au total d'un ou plusieurs des constituants augmentant la résistance classiques suivants en les proportions individuelles indiquées :
   Cu 0 - 5%
   Mg 0 - 5%
   Zn 0 - 5%
2. Alliage suivant la revendication 1, comprenant 1 à 5% de lithium et 1 à 5% de niobium, en proportions pondérales.
3. Alliage suivant la revendication 1, comprenant 1à 5% de lithium et 0,5 à 1,5% de molybdène, en proportions pondérales.
4. Alliage suivant la revendication 1, comprenant 1 à 5% de lithium et 3 à 5% de hafnium, en proportions pondérales.
5. Alliage suivant la revendication 1, comprenant 1 à 5% de lithium et 1 à 3% de tungstène, en proportions pondérales.
EP87906835A 1986-10-21 1987-10-19 Alliages a base d'aluminium contenant du lithium obtenus par voie de solidification rapide Expired - Lifetime EP0327556B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87906835T ATE73173T1 (de) 1986-10-21 1987-10-19 Lithium enthaltende aluminiumlegierungen, hergestellt auf dem weg der raschen abkuehlung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8625189 1986-10-21
GB08625189A GB2196646A (en) 1986-10-21 1986-10-21 Rapid soldification route aluminium alloys

Publications (2)

Publication Number Publication Date
EP0327556A1 EP0327556A1 (fr) 1989-08-16
EP0327556B1 true EP0327556B1 (fr) 1992-03-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87906835A Expired - Lifetime EP0327556B1 (fr) 1986-10-21 1987-10-19 Alliages a base d'aluminium contenant du lithium obtenus par voie de solidification rapide

Country Status (8)

Country Link
EP (1) EP0327556B1 (fr)
JP (1) JP2768676B2 (fr)
AT (1) ATE73173T1 (fr)
AU (1) AU601236B2 (fr)
CA (1) CA1325900C (fr)
DE (1) DE3777195D1 (fr)
GB (2) GB2196646A (fr)
WO (1) WO1988003178A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2196647A (en) * 1986-10-21 1988-05-05 Secr Defence Rapid solidification route aluminium alloys
US5240517A (en) * 1988-04-28 1993-08-31 Yoshida Kogyo K.K. High strength, heat resistant aluminum-based alloys
JPH0621326B2 (ja) * 1988-04-28 1994-03-23 健 増本 高力、耐熱性アルミニウム基合金

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH216204A (de) * 1937-10-29 1941-08-15 Kommanditgesellschaft Mahle Aluminium-Legierung, insbesondere für Kolben von Brennkraftmaschinen.
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
FR2538142B1 (fr) * 1982-12-20 1989-06-02 Siderurgie Fse Inst Rech Procede d'identification de produits metallurgiques et dispositif de mise en oeuvre
US4661172A (en) * 1984-02-29 1987-04-28 Allied Corporation Low density aluminum alloys and method
GB2196647A (en) * 1986-10-21 1988-05-05 Secr Defence Rapid solidification route aluminium alloys

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
4th International Aluminium Lithium Conference, ed. Les Editions de Physique, colloque C3, supplement no. 9, volume 48, septembre 1987, R.C.A. Pratt et al.: "Effect of dispersoid-forming additions on the response to heat treatment of splat-quenched Al-Li-X alloys", pages 341-346 ; see page 343, conclusions and page 345, table 2 *
Chemical Abstracts, vol. 100, no. 24, 11 June 1984, (Columbus, Ohio, US), E.S. Balmuth: "Particle size determination in an AL-3 Li alloy using DSC", see page 272, abstract 196289b, & Scr. Metall. 1984, 18(4), 301-4 *
Metals & Materials, (Jan. 1987), page 15-20 *

Also Published As

Publication number Publication date
GB2227496B (en) 1991-04-24
GB8908665D0 (en) 1989-06-14
GB2196646A (en) 1988-05-05
ATE73173T1 (de) 1992-03-15
GB2227496A (en) 1990-08-01
WO1988003178A1 (fr) 1988-05-05
JPH02500754A (ja) 1990-03-15
AU601236B2 (en) 1990-09-06
DE3777195D1 (de) 1992-04-09
AU8079287A (en) 1988-05-25
EP0327556A1 (fr) 1989-08-16
GB8625189D0 (en) 1986-11-26
JP2768676B2 (ja) 1998-06-25
CA1325900C (fr) 1994-01-11

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