| 摘要 |
An aluminum alloy formed by precipitation hardening in which the eutectic structure present therein has an average area less than 4 ñm<2>. The alloy contains 6.5 to 7.5 wt.% silicon, up to 0.36 wt.% magnesium, and 20 to 70 ppm strontium and is suitable for use as a vehicle wheel. The method for heat treatment of the aluminum alloy formed by precipitation hardening comprises: conducting a solution treatment by causing the work piece to be present in a fluidized bed so that at least 60% of the silicon and/or magnesium forms a solid solution in an a phase; and conducting an aging treatment at a temperature not lower than 150 DEG C but lower than 200 DEG C. The aluminum alloy thus obtained has well-balanced three mechanical properties, i.e., tensile strength, proof stress, and elongation, and has excellent fatigue strength.
|
