EP0137180A1 - Alliage d'aluminium, résistant aux températures élevées - Google Patents

Alliage d'aluminium, résistant aux températures élevées Download PDF

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Publication number
EP0137180A1
EP0137180A1 EP84109194A EP84109194A EP0137180A1 EP 0137180 A1 EP0137180 A1 EP 0137180A1 EP 84109194 A EP84109194 A EP 84109194A EP 84109194 A EP84109194 A EP 84109194A EP 0137180 A1 EP0137180 A1 EP 0137180A1
Authority
EP
European Patent Office
Prior art keywords
weight
ranging
heat
aluminum alloy
copper
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.)
Granted
Application number
EP84109194A
Other languages
German (de)
English (en)
Other versions
EP0137180B1 (fr
Inventor
Masahiko Shioda
Syunsuke Suzuki
Akira Matsuyama
Yoshishiro Maki
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Publication of EP0137180A1 publication Critical patent/EP0137180A1/fr
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Publication of EP0137180B1 publication Critical patent/EP0137180B1/fr
Expired legal-status Critical Current

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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
    • 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

Definitions

  • This invention relates, in general, to a heat-resisting aluminum alloy which is high in mechanical strength not only at ordinary temperatures but also at high temperatures, and more particularly to the heat-resisting aluminum alloy suitable for the material of automotive engine component parts subjected to ordinary to high temperatures.
  • so-called high strength aluminum alloy such as one whose designation number is 7075 has a good strength characteristics at normal temperatures but is sharply lowered in strength in a temperature range from normal temperatures to 200°C.
  • high strength aluminum alloy is not suitable for the material of the component parts of automotive engines.
  • the designation numbers of aluminum alloys mentioned hereinabove and hereinafter are adopted by the Aluminum Association in the United States of America.
  • heat-resisting aluminum alloy such as one whose designation number is 2218, it is excellent in strength at high temperatures but is lower in strength at normal temperatures. As a result, such heat-resisting aluminum alloy is also not suitable for the material of automotive engine component parts.
  • a heat-resisting aluminum alloy according to the present invention contains manganese ranging from 6 to 8% by weight, iron ranging from 0.5 to 2% by weight, zirconium ranging from 0.03 to 0.5% by weight, and copper ranging from 2 to 5% by weight.
  • the balance is essentially aluminum.
  • a heat-resisting aluminum alloy comprises manganese ranging from 6 to 8% by weight, iron ranging from 0.5 to 2% by weight, zirconium ranging from 0.03 to 0.5, copper ranging from 2 to 5% by weight, and the balance essentially aluminum in which the balance may include impurities.
  • the upper limit of the added amount or content of manganese (Mn) and iron (Fe) is kept lower thereby to suppress cystallization of bulky phase and segregation of Mn compound, while increasing the added amount or content of copper (Cu) which is an additive element for improving mechanical strength throughout a wide temperature range from ordinary temperatures to about 250°C without affecting Mn compound.
  • Cu copper
  • Mn is an element effective for improving heat resistance and wear resistance of aluminum alloy.
  • the content of Mn is less than 6%, sufficient heat resistance cannot be obtained, while if it exceeds 8%, there occurs crystallization of the bulky phase and segregation of Mn compound at the cooling rate obtained by the atomization process. As a result, the content of Mn has been limited within the range from 6 to 8% by weight.
  • Fe is an element effective for improving high temperature stability of supersaturated solid solution (obtained by quenching) of At-Mn alloy and fine Al-Mn intermetallic compound.
  • the content of Fe is less than 0.5%, such an effect cannot be obtained, while if it exceeds 2%, brittle phase of Al-Mn-Fe and At-Fe is crystallized in the atomization process. As a result, the content of Fe has been limited within the range from 0.5 to 2% by weight.
  • Zr is an element effective for making fine crystal particles in addition for improving high temperature stability of supersaturated solid solution of Al-Mn alloy and fine Al-Mn intermetallic compound.
  • the content of Zr is less than 0.03%, such an effect cannot be obtained, while if it exceeds 0.5%, there occurs enlargement of Al-Zr phase. As a result, the content of Zr has been limited within the range from 0.03 to 0.5% by weight.
  • Cu is an element which is effective for improving mechanical strength at ordinary temperatures and by which the heat-resisting aluminum alloy according to the present invention is most characterized.
  • the present invention is intended to improve the mechanical strength in a wide temperature range from ordinary temperatures to 250°C without affecting Mn compound, by increasing the content of Cu in order to compensate a decrease of Mn, Fe content which decrease is made for the purpose of suppressing coarsening and segregation of Mn compound in powder form produced by the atomization process.
  • the content of Cu is less than 2%, the effect of strength improvement cannot be expected, while if it exceeds 5%, corrosion resistance of the aluminum alloy is degraded, accompanied by deteriorating the high temperature stability of the supersaturated solid solution of A 1 -Mn alloy and very fine Al-Mn intermetallic compound. As a result, the content of Cu has been limited within the range from 2 to 5% by weight.
  • Si silicon
  • Mg magnesium
  • Mg is an element which improves mechanical strength at ordinary temperatures by age hardening upon binding of Mg with Si.
  • Si tends to take the form ⁇ -Al(Fe,Mn)Si phase and therefore strength improvement due to the precipitation of Mg 2 Si phase is degraded as compared with that due Cu addition.
  • the Sample Nos. 6 and 7 correspond to aluminum alloys whose designation numbers are 2218 and 7075, respectively. These were prepared as follows:
  • the Sample Nos. 8 and 9 aluminum alloys (Comparative Examples) whose Mn and Fe contents are less than those of the aluminum alloy of the present invention are slightly lower in strength at 200°C as compared with the aluminum alloy of the preent invention.
  • the Sample Nos. 10, 11 and 12 aluminum alloys (Comparative Examples) whose Mn and Fe contents are more than those of the aluminum alloy of the present invention are degraded in strength as compared with the aluminum alloy of the present invention because coarsening and segregation of Mn compound unavoidably occurs at the cooling rate obtained by the atomization process.
  • the Sample Nos. 8 to 12 aluminum alloys have been confirmed to be inferior as compared with the aluminum alloy according to the present invention.
  • the aluminum alloy according to the present invention is a light alloy material which is excellent in mechanical strength both at ordinary temperatures and at high temperatures as compared with conventional aluminum alloys, so that it is widely applicable, for example, engine component parts which are required not only to be heat-resistant but also to be high in ordinary temperature strength, while achieving weight reduction of the component parts and an assembled product.
  • an article made of the aluminum alloy of the present invention can be produced with powder particles prepared by the atomization process, thus offering an advantage of omitting quench solidification such as troublesome splat cooling process.

Landscapes

  • Chemical & Material Sciences (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)
EP19840109194 1983-08-17 1984-08-02 Alliage d'aluminium, résistant aux températures élevées Expired EP0137180B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP149161/83 1983-08-17
JP14916183A JPS6043453A (ja) 1983-08-17 1983-08-17 耐熱アルミニウム合金

Publications (2)

Publication Number Publication Date
EP0137180A1 true EP0137180A1 (fr) 1985-04-17
EP0137180B1 EP0137180B1 (fr) 1988-12-28

Family

ID=15469120

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840109194 Expired EP0137180B1 (fr) 1983-08-17 1984-08-02 Alliage d'aluminium, résistant aux températures élevées

Country Status (3)

Country Link
EP (1) EP0137180B1 (fr)
JP (1) JPS6043453A (fr)
DE (1) DE3475798D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3533233A1 (de) * 1985-09-18 1987-03-19 Vaw Ver Aluminium Werke Ag Hochwarmfeste aluminiumlegierung und verfahren zu ihrer herstellung
FR2669844A1 (fr) * 1990-11-20 1992-06-05 Honda Motor Co Ltd Poudre d'alliage d'aluminium, produit compacte vert et produit compacte frittee pour la metallurgie des poudres.
EP0860509A2 (fr) * 1997-02-20 1998-08-26 Ykk Corporation Alliage d'aluminium à haute résistance mécanique et à haute ductilité
KR100415400B1 (ko) * 2001-04-26 2004-01-16 학교법인연세대학교 자발적 파괴에 의한 Ａｌ기 준결정상 합금분말의 제조방법

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB498227A (en) * 1937-06-04 1939-01-04 Hubert Sutton Improvements in or relating to aluminium alloys
US2966731A (en) * 1958-03-27 1961-01-03 Aluminum Co Of America Aluminum base alloy powder product
FR1370542A (fr) * 1963-10-09 1964-08-21 Alliages légers résistant aux températures élevées, procédé et applications les concernant
US3265493A (en) * 1963-05-31 1966-08-09 Dow Chemical Co Aluminum base pellet alloys containing copper and magnesium and process for producing the same
US3462248A (en) * 1956-12-14 1969-08-19 Kaiser Aluminium Chem Corp Metallurgy

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB498227A (en) * 1937-06-04 1939-01-04 Hubert Sutton Improvements in or relating to aluminium alloys
US3462248A (en) * 1956-12-14 1969-08-19 Kaiser Aluminium Chem Corp Metallurgy
US2966731A (en) * 1958-03-27 1961-01-03 Aluminum Co Of America Aluminum base alloy powder product
US3265493A (en) * 1963-05-31 1966-08-09 Dow Chemical Co Aluminum base pellet alloys containing copper and magnesium and process for producing the same
FR1370542A (fr) * 1963-10-09 1964-08-21 Alliages légers résistant aux températures élevées, procédé et applications les concernant

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3533233A1 (de) * 1985-09-18 1987-03-19 Vaw Ver Aluminium Werke Ag Hochwarmfeste aluminiumlegierung und verfahren zu ihrer herstellung
EP0219629A1 (fr) * 1985-09-18 1987-04-29 Vereinigte Aluminium-Werke Aktiengesellschaft Alliage d'aluminium résistant aux températures élevées et son procédé de préparation
FR2669844A1 (fr) * 1990-11-20 1992-06-05 Honda Motor Co Ltd Poudre d'alliage d'aluminium, produit compacte vert et produit compacte frittee pour la metallurgie des poudres.
EP0860509A2 (fr) * 1997-02-20 1998-08-26 Ykk Corporation Alliage d'aluminium à haute résistance mécanique et à haute ductilité
EP0860509A3 (fr) * 1997-02-20 1998-11-11 Ykk Corporation Alliage d'aluminium à haute résistance mécanique et à haute ductilité
US6334911B2 (en) 1997-02-20 2002-01-01 Ykk Corporation High-strength, high-ductility aluminum alloy
KR100415400B1 (ko) * 2001-04-26 2004-01-16 학교법인연세대학교 자발적 파괴에 의한 Ａｌ기 준결정상 합금분말의 제조방법

Also Published As

Publication number Publication date
JPS6157380B2 (fr) 1986-12-06
EP0137180B1 (fr) 1988-12-28
JPS6043453A (ja) 1985-03-08
DE3475798D1 (en) 1989-02-02

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