| 摘要 |
An aluminum alloy formed by precipitation hardening in which the eutectic structure present therein has an average area less than 4 m?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° C. but lower than 200° 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.
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