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Aluminum alloys and method for their production

  • US 6,132,532 A
  • Filed: 01/12/1998
  • Issued: 10/17/2000
  • Est. Priority Date: 01/13/1997
  • Status: Expired due to Fees
First Claim
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1. A process for producing an Al--Si casting alloy, comprising:

  • heating the alloy to the pouring temperature Tp between liquidus temperature and 750°

    C.,adding a modifier to the melt, the modifier comprising an ultra disperse powder capable of remaining in a solid state during the process for producing the Al--Si casting alloy.overheating the melt to a second temperature, said second temperature being above a branching temperature of a viscosity or density temperature dependency of said melt as obtained at heating from liquidus up to 1100°

    C. and subsequent cooling,maintaining the melt at the second temperature for between about 20 and 30 minutes,cooling the melt down to the pouring temperature Tp between liquidus temperature and 750°

    C.,performing at least one of the steps of degassing and fluxing the alloy, and pouring the melt.

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