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对时效工艺对汽车发动机用铸造6063铝合金显微组织及力学性能的影响进行了研究,探讨了力学性能的变化机理与组织演变规律。结果表明:若注重材料性能,应采用190℃×4 h的单级时效工艺;若注重工艺效率及能耗成本,应采用210℃×2h的单级时效工艺或205℃×0.5h+190℃×1h与190℃×1h+210℃×1h的双级时效工艺。
The effects of aging process on the microstructure and mechanical properties of cast 6063 aluminum alloy for automobile engine were studied. The mechanism of mechanical properties and the evolution of microstructure were discussed. The results show that the single-stage aging process at 190 ℃ × 4h should be adopted if the performance of materials is concerned. If single-stage aging process at 210 ℃ × 2h or single-stage aging process at 205 ℃ × 0.5h + 190 ℃ × 1h and 190 ℃ × 1h + 210 ℃ × 1h two-stage aging process.