Method for heat treatment of precipitation hardening Al allot
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United States of America Patent
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app pub date -
Feb 25, 2005
filing date -
Aug 8, 2000
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Abandoned
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Abstract
There is provided a precipitation hardening Al alloy in which an average area of eutectic structures existing in the Al alloy is less than 4 .mu.m.sup.2. This Al alloy contains 6.5 to 7.5% by mass of Si, 0.36% by mass or less of Mg and 20 to 70 ppm of Sr, and is preferably used as a vehicle wheel. In heat treatment method of the precipitation hardening Al alloy, a work piece is subjected to solution treatment by being made to exist in a fluidized bed, and further a rate of solid solutions of Si and/or Mg into a phase is made to be 60% or more in the solution treatment and aging treatment is carried out at temperatures from 150.degree. C. or more to less than 200.degree. C. The precipitation hardening Al alloy to be obtained has well-balanced three mechanical properties of tensile strength, yield strength, and elongation, and is also excellent in fatigue strength.
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