EP0256449B1 - Pulvermetallurgische Herstellung eines Werkstücks aus einer warmfesten Aluminiumlegierung - Google Patents

Pulvermetallurgische Herstellung eines Werkstücks aus einer warmfesten Aluminiumlegierung Download PDF

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Publication number
EP0256449B1
EP0256449B1 EP87111462A EP87111462A EP0256449B1 EP 0256449 B1 EP0256449 B1 EP 0256449B1 EP 87111462 A EP87111462 A EP 87111462A EP 87111462 A EP87111462 A EP 87111462A EP 0256449 B1 EP0256449 B1 EP 0256449B1
Authority
EP
European Patent Office
Prior art keywords
weight
powder
alloy
production
workpiece according
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 - Lifetime
Application number
EP87111462A
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German (de)
English (en)
French (fr)
Other versions
EP0256449A1 (de
Inventor
Malcolm James Dr. Couper
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.)
BBC Brown Boveri AG Switzerland
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BBC Brown Boveri AG Switzerland
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Filing date
Publication date
Application filed by BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0256449A1 publication Critical patent/EP0256449A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/002—Making metallic powder or suspensions thereof amorphous or microcrystalline
    • B22F9/008—Rapid solidification processing
    • 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

Definitions

  • Heat-resistant aluminum alloys which are made from powders obtained at high cooling rates by atomizing a melt. High content of alloy components not permitted under the usual solidification conditions, e.g. Fe and Cr.
  • the invention relates to the production of aluminum alloy powders and the production of moldings from these powders.
  • Aluminum alloys which are suitable for the production of powders from melts by means of gas jet atomization using very high cooling speeds (105 ° C./s and more) and can be used for the production of heat-resistant workpieces, have become known in numerous variations.
  • An important group are the polynary alloys of the type AI / Fe / X, which generally have relatively high iron contents, where X denotes at least one of the elements Ti, Zr, Hf, V, Nb, Cr, Mo, W.
  • An alloy with 8% by weight Fe and 2% by weight Mo apparently occupies a special position (cf. GB-PS 2 088 409 A).
  • the invention has for its object to provide a method for powder metallurgical production of a workpiece from a heat-resistant aluminum alloy taking into account the optimum alloy composition and adaptation of the process steps, which leads to tougher and more ductile finished products without sacrificing strength. In doing so, powder production should also be carried out at higher temperatures. stable phases are achieved, which - regardless of the particle size - are homogeneously distributed over the whole powder grain and give it a high deformability.
  • an alloy which contains 8 to 14% by weight Fe, 0.5 to 2% by weight V and 0.2 to 1% by weight Mn, the rest being aluminum and contains any impurities, the alloy being melted, the melt being atomized at a cooling rate of at least 105 ° C./s in a gas stream to give particles with a diameter of 1 to 40 11 m, the dispersoids formed thereby being homogeneously distributed and not micro-eutectic Zone is present within a powder particle, and that the powder is compacted at a temperature of 350 to 450 ° C under a pressure of 2000 to 6000 bar in such a way that the intermetallic phase stabilized by Mn forms Al 6 Fe in fine distribution and the phase AI 3 Fe is largely suppressed.
  • the melt was first atomized in a device by means of a gas stream (nitrogen) while maintaining a cooling rate of at least 105 ° C./s to a powder.
  • the average particle diameter was approx. 20 ⁇ m, the maximum approx. 40 ⁇ m.
  • the structure of the particles was characterized by an even distribution of the dispersoids, while the disruptive micro-eutectic that otherwise occurs with conventional alloys was missing.
  • Approx. 160 g of the powder were compacted by hot pressing in a mold under a pressure of 3000 bar at a temperature of 400 ° C. to a press bolt of approximately 99% theoretical density.
  • the heating time in the mold was about 45 minutes.
  • the press bolt had a diameter of 40 mm and a height of 60 mm. This press bolt was inserted into the cylinder of an extrusion press and pressed under a pressure of 5000 bar at a temperature of 400 ° C to a rod of 13 mm in diameter.
  • the reduction ratio was approximately 9: 1.
  • Test pieces were cut out of the bar and the mechanical properties measured at room temperature and at 300 ° C. The yield point at room temperature was 450 MPa. A metallographic examination revealed the presence of considerable volume fractions of the Al 6 Fe phase, while practically no Al 3 Fe could be found. Furthermore, there were no non-deformed powder particles containing Al 3 Fe in the compacted material.
  • the cooling rate during powder production should be at least 10 5 ° C / s.
  • the particle diameter of the powder produced by gas jet atomization should be within the limits of 1 to 40 ⁇ m.
  • the powder can be compressed at temperatures between 350 and 450 ° C under pressures of 2000 to 6000 bar. Preferred values are 400 ° C for powder compaction.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Powder Metallurgy (AREA)
  • Materials For Medical Uses (AREA)
EP87111462A 1986-08-12 1987-08-07 Pulvermetallurgische Herstellung eines Werkstücks aus einer warmfesten Aluminiumlegierung Expired - Lifetime EP0256449B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3232/86A CH673242A5 (it) 1986-08-12 1986-08-12
CH3232/86 1986-08-12

Publications (2)

Publication Number Publication Date
EP0256449A1 EP0256449A1 (de) 1988-02-24
EP0256449B1 true EP0256449B1 (de) 1990-05-16

Family

ID=4251507

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111462A Expired - Lifetime EP0256449B1 (de) 1986-08-12 1987-08-07 Pulvermetallurgische Herstellung eines Werkstücks aus einer warmfesten Aluminiumlegierung

Country Status (7)

Country Link
US (1) US4737339A (it)
EP (1) EP0256449B1 (it)
JP (1) JPS6347343A (it)
CH (1) CH673242A5 (it)
DE (1) DE3762756D1 (it)
DK (1) DK415787A (it)
NO (1) NO873365L (it)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH673240A5 (it) * 1986-08-12 1990-02-28 Bbc Brown Boveri & Cie
FR2636974B1 (fr) * 1988-09-26 1992-07-24 Pechiney Rhenalu Pieces en alliage d'aluminium gardant une bonne resistance a la fatigue apres un maintien prolonge a chaud et procede de fabrication desdites pieces
DE69315492T2 (de) * 1992-07-02 1998-04-02 Sumitomo Electric Industries Stickstoff-verdichtete Sinterlegierungen auf Aluminium-Basis und Verfahren zur Herstellung
JPH08325660A (ja) * 1995-05-31 1996-12-10 Ndc Co Ltd 多孔質アルミニウム焼結材
CN1658989A (zh) * 2002-06-13 2005-08-24 塔奇斯通研究实验室有限公司 具有金属间补强物的金属基质复合材料
US7794520B2 (en) * 2002-06-13 2010-09-14 Touchstone Research Laboratory, Ltd. Metal matrix composites with intermetallic reinforcements

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2311391A1 (fr) * 1975-05-14 1976-12-10 Pechiney Aluminium Conducteurs electriques en alliages al fe obtenus par filage de grenaille
US4347076A (en) * 1980-10-03 1982-08-31 Marko Materials, Inc. Aluminum-transition metal alloys made using rapidly solidified powers and method
US4647321A (en) * 1980-11-24 1987-03-03 United Technologies Corporation Dispersion strengthened aluminum alloys
US4435213A (en) * 1982-09-13 1984-03-06 Aluminum Company Of America Method for producing aluminum powder alloy products having improved strength properties
DE3524276A1 (de) * 1984-07-27 1986-01-30 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Aluminiumlegierung zur herstellung von ultra-feinkoernigem pulver mit verbesserten mechanischen und gefuegeeigenschaften
US4734130A (en) * 1984-08-10 1988-03-29 Allied Corporation Method of producing rapidly solidified aluminum-transition metal-silicon alloys

Also Published As

Publication number Publication date
NO873365L (no) 1988-02-15
DK415787D0 (da) 1987-08-10
DE3762756D1 (de) 1990-06-21
DK415787A (da) 1988-02-13
CH673242A5 (it) 1990-02-28
NO873365D0 (no) 1987-08-11
EP0256449A1 (de) 1988-02-24
US4737339A (en) 1988-04-12
JPS6347343A (ja) 1988-02-29

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