EP0207268B1 - Alliage d'aluminium apte au refroidissement rapide à partir d'une masse fondue sursaturée en éléments d'alliage - Google Patents

Alliage d'aluminium apte au refroidissement rapide à partir d'une masse fondue sursaturée en éléments d'alliage Download PDF

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Publication number
EP0207268B1
EP0207268B1 EP86106579A EP86106579A EP0207268B1 EP 0207268 B1 EP0207268 B1 EP 0207268B1 EP 86106579 A EP86106579 A EP 86106579A EP 86106579 A EP86106579 A EP 86106579A EP 0207268 B1 EP0207268 B1 EP 0207268B1
Authority
EP
European Patent Office
Prior art keywords
weight
aluminium alloy
alloy
melt
rapid cooling
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
EP86106579A
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German (de)
English (en)
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EP0207268A1 (fr
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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Application filed by BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0207268A1 publication Critical patent/EP0207268A1/fr
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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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • 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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/1208—Containers or coating used therefor
    • 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
    • C22C21/00—Alloys based on aluminium
    • 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

  • the invention is based on an aluminum alloy, suitable for rapid cooling from a melt oversaturated with alloy components, according to the preamble of claim 1.
  • the aluminum alloys cited in the above publications are predominantly of a type with relatively high iron contents. These have in the form of powder, flakes, tapes after faster. Cooling from a melt, the primary solidification state has very high strengths and cause difficulties in the subsequent compression to form compacts. Either higher pressures or higher temperatures are required, which is complex on the one hand and on the other hand involves the risk of not achieving the optimal microstructure for the end product (cf. J. Duszcuzyk and P. Jongenburger, TMS-AIME Meeting, New York, 24 - Born 28, 1985; RJ Wanhill, PM Aerospace Materials Conference, Berne, Nov. 1984; GJ Hildeman, DJ Lege and AK Vasudevan, High Strength PM Aluminum Alloys, eds. Koczak and Hildeman, 1982, p. 249).
  • Aluminum alloys containing chromium and manganese which allow the formation of supersaturated solid solutions, are softer and more ductile and, consequently, easier to compress and process than powder (see P. Furrer and H. Warlimont, Mat. Sci. And Eng. 28, 1977, 127; R. Yearim and D. 'Schcktman, Met. Trans A., 13A, 1891-1898, 1982; EP-A-0 105 595; IR Hughes, GJ Marshall and WS Miller, 5th Conference on Rapidly Quenched Metals, Würzburg , Sept. 1984).
  • the invention is based on the object of specifying aluminum alloys which are particularly suitable for the production of ultrafine-grained powders from melts which are oversaturated with alloy components and have improved mechanical and structural properties.
  • compositions are to be sought which form ductile, easily processable structures and phases under the proposed cooling conditions and which can be further increased in their strength properties and toughness by suitable heat treatments.
  • the main idea of the invention is to improve the properties of the binary Al / Cr alloys (supersaturated solid solution, formation of Al 13 Cr 2 dispersoids by alloying with vanadium and possibly small amounts of further additives.
  • the possibility of the formation of the intermetallic Compound Al l oV which has a low density, that is to say a large specific volume, drastically increases the volume fraction of strength-increasing, finely divided dispersoids in the end product.
  • the simultaneous presence of chromium and vanadium has a mutually supportive effect on thermal stability, the heat resistance and toughness with good ductility of the alloy.
  • an alloy was melted from the pure components Al, Cr and V in the induction furnace under vacuum in a silicon carbide crucible and poured into a water-cooled copper mold.
  • the solidified ingot weighed approximately 1.5 kg. It was mechanically divided into smaller pieces, which were placed in a silicon carbide crucible of the atomizing device were given.
  • the container of this device was then evacuated to a residual pressure of approx. 1.5 Pa, flooded with nitrogen, evacuated again, flooded again with nitrogen and evacuated again. Under these conditions, the batch was melted using an inductive heater and brought to a temperature of 1150 ° C. Now the container was filled with nitrogen and the inductive heating was switched off.
  • the alloy powder was then filled into a thin-walled cylindrical aluminum can 70 mm in diameter and 250 mm high.
  • the can was evacuated, heated to 450 ° C and left under vacuum at this temperature for 2 h.
  • the residual gas pressure was approximately 0.15 Pa.
  • the can was then sealed by compressing the suction nozzle and placed in a press.
  • the encapsulated alloy powder was compressed at 450 ° C to 96% of the theoretical density of the compact material.
  • the compacted and cold-rolled blank was freed from its aluminum casing by mechanical processing and inserted into an extrusion press as a press bolt. A rod with a diameter of 15 mm was pressed at a temperature of 460 ° C. (reduction ratio 1:22).
  • the strength and ductility values were monitored during the implementation of the process and on the end product.
  • a Vickers hardness of 120 (HV) could be measured on the freshly solidified material without any heat treatment, which indicated good ductility.
  • the Vickers hardness at room temperature after a heat treatment at a temperature of 400 ° C. and a duration of 1 h was determined at 190 (HV) on a finished extruded test specimen. This increase shows not only the striking effect of the hardening dispersoids but also their excellent thermal stability.
  • a suitable alloy was melted in the alumina crucible under an inert gas atmosphere in the induction furnace from suitable AI / Cr and AIN master alloys and an ingot of approx. 1 kg was cast. 400 g of this billet were melted inductively in a device and, as a jet under high pressure in the first gas phase, hurled against the circumference of a cooled copper disc at a peripheral speed of 12 m / s (so-called "melt-spinning" process). Due to the high cooling rate, an ultra-fine-grained tape with a thickness of approx. 30gm was produced. The tape was crushed and ground into fine-grained powder.
  • a cylindrical capsule made of ductile aluminum sheet 60 mm in diameter and 60 mm in height was filled with the powder, evacuated and welded. Then the filled capsule was hot pressed at 420 ° C. under a pressure of 200 MPa to the full theoretical density.
  • the capsule was removed by mechanical processing and the pressed body was inserted as a press bolt of 40 mm in diameter in an extrusion press with a reduction ratio of 25: 1 and pressed at 400 ° C. to a rod of 8 mm in diameter.
  • the test gave the following results:
  • the strip solidified primarily from the supersaturated melt by rapid cooling, had a Vickers hardness of 135 (HV).
  • the finished extruded body was subjected to a heat treatment at a temperature of 400 ° C and for 2 hours. It showed a Vickers hardness of 205 (HV), which indicated high strength.
  • the alloy was atomized, compacted, pressed and processed into a round rod to give an ultra-fine-grained powder with an average particle size of 20 ⁇ m.
  • the molten alloy had the following composition:
  • the strip solidified directly from the melt had a Vickers hardness of 140 (HV).
  • the finished test specimen had a Vickers hardness (measured at room temperature) of 185 (HV) after heat treatment at 400 ° C. for 1 h.
  • the invention is not restricted to the exemplary embodiments.
  • the aluminum alloy can in principle contain 2 to 5.5% by weight of Cr, 2 to 5.5% by weight of V and optionally one or more of the metals Mo, Zr Ti or Fe in a total content of at most 1% by weight , Rest AI exist, the total content of all alloy elements is at most 10 wt .-%.
  • the aluminum alloy should preferably contain at least 1.2% by weight of the Al 13 Cr 2 phase and at least 1.1% by weight of the AhoV phase embedded in a solid solution.
  • the structure of the aluminum alloy should also preferably contain at least 1.2% by weight of phase Al 13 Cr 2 and at least 1.1% by weight of phase Al 10 V as a finely divided dispersoid of at most 0.1 ⁇ m particle diameter.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Continuous Casting (AREA)

Claims (7)

1. Alliage d'aluminium, apte au refroidissement rapide à partir d'un bain de fusion sursaturé en composants d'alliage, caractérisé en ce qu'il se compose, en poids, de 2 à 5,5% Cr, 2 à 5,5% V, le reste étant de l'aluminium ou en ce qu'il se compose, en poids, de 2 à 5,5% Cr, 2 à 5,5% V, ainsi que d'un ou plusieurs des métaux Mo, Zr, Ti ou Fe en une teneur totale de 1 % en poids au maximum, le reste étant de l'aluminium, et en ce que la teneur totale de l'ensemble des éléments d'alliage s'élève au maximum à 10% en poids.
2. Alliage d'aluminium suivant la revendication 1, caractérisé en ce qu'il contient, en poids, 5% Cr et 2% V.
3. Alliage d'aluminium suivant la revendication 1, caractérisé en ce qu'il contient, en poids, 4,5% Cr et 2,5% V.
4. Alliage d'aluminium suivant la revendication 1, caractérisé en ce qu'il contient, en poids, 4,5% Cr, 2% V et 1% Mo.
5. Alliage d'aluminium suivant la revendication 1, caractérisé en ce qu'il contient, en poids, 5,1% Cr et 3,0% V.
6. Alliage d'aluminium suivant la revendication 1, caractérisé en ce qu'il contient au moins 1,2% en poids de la phase Ah3Cr2 et au moins 1,1% en poids de la phase AI10V déposés en une solution solide.
7. Alliage d'aluminium suivant la revendication 1, caractérisé en ce qu'il contient au moins 1,2% en poids de la phase AI13Cr2 et au moins 1,1% en poids de la phase AI10V sous la forme de dispersoïde finement réparti ayant un diamètre de particules de 0,1 µm au maximum.
EP86106579A 1985-06-26 1986-05-14 Alliage d'aluminium apte au refroidissement rapide à partir d'une masse fondue sursaturée en éléments d'alliage Expired EP0207268B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2712/85 1985-06-26
CH271285 1985-06-26

Publications (2)

Publication Number Publication Date
EP0207268A1 EP0207268A1 (fr) 1987-01-07
EP0207268B1 true EP0207268B1 (fr) 1989-08-16

Family

ID=4239901

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86106579A Expired EP0207268B1 (fr) 1985-06-26 1986-05-14 Alliage d'aluminium apte au refroidissement rapide à partir d'une masse fondue sursaturée en éléments d'alliage

Country Status (6)

Country Link
US (1) US4726843A (fr)
EP (1) EP0207268B1 (fr)
JP (1) JPS624851A (fr)
CA (1) CA1282267C (fr)
DE (1) DE3665077D1 (fr)
NO (1) NO862577L (fr)

Families Citing this family (8)

* 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
JPH01149936A (ja) * 1987-12-04 1989-06-13 Honda Motor Co Ltd 粉末冶金用耐熱Ａｌ合金
EP0577436B1 (fr) * 1992-07-02 1997-12-03 Sumitomo Electric Industries, Limited Alliages d'aluminium frittés et comprimés en azote et procédé de fabrication
US5511662A (en) * 1993-10-25 1996-04-30 Amoroso; Dennis J. Foam rubber tool retainer
CN102212723B (zh) * 2011-05-10 2012-08-01 李建明 一种铬铝中间合金材料的制备方法
CN119156461A (zh) 2022-04-12 2024-12-17 纳米合金技术公司 铝合金及用于生产合金的方法
US20250197968A1 (en) 2022-04-12 2025-06-19 Nano Alloys Technology Method for producing a solidified lightweight aluminium or magnesium alloy
CN115747585B (zh) * 2022-11-25 2024-03-01 航天科工(长沙)新材料研究院有限公司 一种耐热铝合金件及其制备方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1034260A (fr) * 1951-03-21 1953-07-21 Alliage à base d'aluminium et de vanadium
US4347076A (en) * 1980-10-03 1982-08-31 Marko Materials, Inc. Aluminum-transition metal alloys made using rapidly solidified powers and method
US4347376A (en) * 1980-12-24 1982-08-31 Fluorchem Inc. Method of making and polymerizing perfluoroalkylene acetylene compounds

Also Published As

Publication number Publication date
JPS624851A (ja) 1987-01-10
DE3665077D1 (en) 1989-09-21
NO862577L (no) 1986-12-29
CA1282267C (fr) 1991-04-02
US4726843A (en) 1988-02-23
EP0207268A1 (fr) 1987-01-07
NO862577D0 (no) 1986-06-25

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