(19)
(11) EP 1 975 262 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.09.2010 Bulletin 2010/37

(43) Date of publication A2:
01.10.2008 Bulletin 2008/40

(21) Application number: 08005905.8

(22) Date of filing: 27.03.2008
(51) International Patent Classification (IPC): 
C22C 21/02(2006.01)
 C22F 1/043(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA MK RS

(30) Priority: 30.03.2007 JP 2007094817

(71) Applicant: Kabushiki Kaisha Toyota Chuo Kenkyusho
Aichi-Gun Aichi 480-1192 (JP)

(72) Inventors:
  • Kawahara, Hiroshi
    Nagakute-cho Aichi-gun Aichi-ken, 480-1192 (JP)
  • Ikuno, Hajime
    Nagakute-cho Aichi-gun Aichi-ken, 480-1192 (JP)
  • Hohjo, Hiroshi
    Nagakute-cho Aichi-gun Aichi-ken, 480-1192 (JP)
  • Hotta, Shoji
    Nagakute-cho Aichi-gun Aichi-ken, 480-1192 (JP)
  • Ueda, Isamu
    Nagakute-cho Aichi-gun Aichi-ken, 480-1192 (JP)
  • Yamada, Akira
    Nagakute-cho Aichi-gun Aichi-ken, 480-1192 (JP)

(74) Representative: Kramer - Barske - Schmidtchen 
European Patent Attorneys Landsberger Strasse 300
80687 München
80687 München (DE)

   


(54) Aluminum alloys for casting, aluminum alloy castings and process for producing aluminum alloy castings


(57) (Assignment)
To provide an aluminum alloy casting with excellent strength, fatigue resistance, etc.
(Solution)
An aluminum alloy casting according to the present invention includes 4-12% Si, 1.0-3.0% Cu, 0.2-0.6% Mg, 0.2-3% Ni, o.1-0.7% Fe, 0.1-0.3% Ti, 0.03-0. 5% Zr, balance Al and inevitable impurities, when the entirety is taken as 100% by mass and has a metallographic structure, comprising a base phase mainly consisting of α-Al, a skeleton phase which is crystallized to surround the base phase in a network configuration, and the first and second precipitation phases which are precipitated in the base phase and have different particle sizes. This aluminum alloy casting has an excellent thermal fatigue strength as well as high strength and high fatigue strength as a base material.







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