EP0210359B1 - Alliage d'aluminium pour la fabrication de poudre présentant des propriétés accrues de résistance à la chaleur - Google Patents

Alliage d'aluminium pour la fabrication de poudre présentant des propriétés accrues de résistance à la chaleur Download PDF

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Publication number
EP0210359B1
EP0210359B1 EP86106735A EP86106735A EP0210359B1 EP 0210359 B1 EP0210359 B1 EP 0210359B1 EP 86106735 A EP86106735 A EP 86106735A EP 86106735 A EP86106735 A EP 86106735A EP 0210359 B1 EP0210359 B1 EP 0210359B1
Authority
EP
European Patent Office
Prior art keywords
weight
aluminium alloy
powder
content
elements
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
EP86106735A
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German (de)
English (en)
Other versions
EP0210359A1 (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
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 BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0210359A1 publication Critical patent/EP0210359A1/fr
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Classifications

    • 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

  • the invention relates to an aluminum alloy for the production of powder with increased heat resistance according to the preamble of claim 1.
  • a cylindrical capsule made of ductile aluminum sheet with a diameter of 50 mm and a height of 60 mm was filled with the powder, evacuated and welded.
  • the filled capsule was then hot pressed at 400 ° C. under a pressure of 250 MPa to the full theoretical density.
  • the capsule was removed by mechanical processing and the pressed body was inserted as a press bolt with a diameter of 36 mm into an extrusion press with a reduction ratio of 30: 1 1 and pressed at 400 ° C. to a rod with a diameter of 6.5 mm.
  • Test specimens were worked out from the rod to investigate the physical and mechanical properties.
  • a test specimen was subjected to a heat treatment at 400 ° C. for 2 hours.
  • the Vickers hardness determined afterwards at room temperature was 180 (HV). With a density of only 2.85 g / cm 3 , the tensile strength and yield strength were consistently 50 to 80% higher than that of comparable conventional alloys.
  • Example 1 The successive further processing into a strip, a powder and an extruded rod was carried out exactly the same as described in Example 1.
  • the original Vickers hardness at room temperature was 200 (HV), after heat treatment at 400 ° C / 2 it was still 180 (HV). This shows that an excellent temperature resistance has been achieved, which indicates a high heat resistance.
  • the alloy was melted from corresponding Al / Li, Al / Cr and Al / Zr master alloys and cast into an ingot similar to Example 1.
  • the ingot was melted again and brought to a casting temperature of 1,100 ° C.
  • the melt was atomized under an inert gas atmosphere of 6 MPa pressure to a powder with an average particle diameter of 30 ⁇ m.
  • the powder produced in this way was poured into an aluminum can, which was then evacuated and sealed in a vacuum-tight manner.
  • Example 2 Similar to Example 1, the body was compressed and hot pressed. After turning off the can part forming the jacket, the pressed body was heated to a temperature of 450 ° C. and extruded with a reduction ratio of 30: to a round rod at this temperature.
  • the entire powder processing was carried out under a protective gas atmosphere.
  • Test specimens worked out from the rod gave a density of 2.80 g / cm 3 . After a heat treatment at 400 ° C. for 2 hours, the Vickers hardness at room temperature was 170 (HV), after a further heat treatment at the same temperature it was still 160 (HV) for an additional 50 hours. This suggests a great thermal stability of the structure. The improvement in strength values compared to conventional alloys of the same density was approx. 100%.
  • the aluminum alloy can consist of 1.5 to 5 wt.% Li, 4 to 11 wt.% Fe and 1 to 6 wt 5 wt .-% Li, 4 to 7 wt .-% Cr as well as 1 to 4 wt .-% of at least one of the elements V, Mn, Zr, remainder AI exist, wherein it comprises at least 15 wt .-% of the phase AI 3 Li and also contains at least 2.6% by weight of the phase Al 3 Zr or the corresponding intermetallic compounds of Al with V or Mo or with V or Mn as a finely divided dispersoid of at most 0.1 ⁇ m particle diameter.
  • the aluminum alloys have a relatively large volume fraction of phases - in particular intermetallic compounds - which cannot be produced using conventional manufacturing methods. These particles, which act as dispersoids, are mainly responsible for the excellent properties of the alloys.

Claims (7)

1. Alliage d'aluminium pour la fabrication de poudre présentant une résistance à chaud accrue, caractérisé en ce qu'il se compose, en poids, de 1,5 à 5 % U, de 4 à 11 % Fe ainsi que de 1 à 6 % d'au moins un des éléments Mo, V, Zr, le reste étant AI et en ce qu'il contient au moins 15 % en poids de la phase AI3U et en outre au moins 2,6 % en poids de la phase AI3Zr ou des composés intermétalliques correspondants de AI avec Mo, V en qualité de dispersoïde finement réparti avec un diamètre de particules de 0,1 µm au maximum.
2. Alliage d'aluminium suivant la revendication 1, caractérisé en ce qu'il se compose, en poids, de 1,5 à 4,5 % Li, de 5 à 10 % Fe et d'au moins un des éléments Mo, V, Zr en une teneur maximale de 2 % en poids chacun, le reste étant AI, la teneur totale en ces trois derniers éléments ne dépassant pas 4 % en poids.
3. Alliage d'aluminium suivant la revendication 2, caractérisé en ce que la teneur en Li est de 2 % en poids, que la teneur en Fe est de 8,5 % en poids et que 1 % en poids de Zr est présent dans l'alliage.
4. Alliage d'aluminium suivant la revendication 2, caractérisé en ce que la teneur en Li est de 2,5 % en poids, que la teneur en Fe est de 8 % en poids et que 1 % en poids de Mo est présent dans l'alliage.
5. Alliage d'aluminium suivant la revendication 1, caractérisé en ce qu'il se compose, en poids, de 1,5 à 4,5 % Li, de 4 à 7 % Fe et d'au moins un des éléments Zr, Mo en une teneur maximale de 2 % en poids chacun, la teneur totale en ces deux derniers éléments ne dépassant pas 4 % en poids.
6. Alliage d'aluminium pour la fabrication de poudre présentant une résistance à chaud accrue, caractérisé en ce qu'il se compose, en poids, de 1,5 à 5 % Li, de 4 à 7 % Cr ainsi que de 1 à 4 % d'au moins un des éléments V, Mn, Zr, le reste étant AI et en ce qu'il contient au moins 15 % en poids de la phase AI3Li et en outre au moins 2,6 % en poids de la phase AI3Zr ou des composés intermétalliques correspondants de AI avec V, Mn en qualité de dispersoïde finement réparti avec un diamètre de particules de 0,1 µm au maximum.
7. Alliage d'aluminium suivant la revendication 6, caractérisé en ce que la teneur en Li est de 3 % en poids, que la teneur en Cr est de 5,5 % en poids et que 1 % en poids de Zr est présent dans l'alliage.
EP86106735A 1985-06-26 1986-05-16 Alliage d'aluminium pour la fabrication de poudre présentant des propriétés accrues de résistance à la chaleur Expired EP0210359B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2713/85 1985-06-26
CH271385 1985-06-26

Publications (2)

Publication Number Publication Date
EP0210359A1 EP0210359A1 (fr) 1987-02-04
EP0210359B1 true EP0210359B1 (fr) 1989-09-20

Family

ID=4239922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86106735A Expired EP0210359B1 (fr) 1985-06-26 1986-05-16 Alliage d'aluminium pour la fabrication de poudre présentant des propriétés accrues de résistance à la chaleur

Country Status (5)

Country Link
US (1) US4765851A (fr)
EP (1) EP0210359B1 (fr)
JP (1) JPS624850A (fr)
DE (1) DE3665740D1 (fr)
NO (1) NO862576L (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04187701A (ja) * 1990-11-20 1992-07-06 Honda Motor Co Ltd 粉末冶金用アルミニウム合金粉末、圧粉体および焼結体
JP4722589B2 (ja) * 2005-06-30 2011-07-13 株式会社三井ハイテック 固定子積層鉄心

Family Cites Families (1)

* 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.

Also Published As

Publication number Publication date
DE3665740D1 (en) 1989-10-26
NO862576D0 (no) 1986-06-25
NO862576L (no) 1986-12-29
JPS624850A (ja) 1987-01-10
EP0210359A1 (fr) 1987-02-04
US4765851A (en) 1988-08-23

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