||This thesis primarily with AA6022 (Al-0.6Mg-1.0Si) for experiment material inquires into the different manufacturing process condition for AA6022 the effect of aluminum alloy aging precipitations.|
The experiment is divided into two parts. One simulates solution treatment of manufacturing process by transforming soaking parameter, hot rolling parameter, annealing parameter, cold rolling parameter, solution parameter. The other simulates cooling condition of manufacturing process by transforming pre-aging parameter. Also interlock the conductivity test, DSC, TEM, tensile test analyzes, seeking the optimum to match AA6022 the manufacturing process of aluminum alloys, make AA6022 through artificial aging can receive the good precipitation enhances the effect.
The results indicate that AA6022 through 570℃soaking,490℃hot rolling, none-annealing, and 560℃solution can reduce constituent and acquire high concentration supersaturated solid solution by solid solution treatment. So they can promote more precipitation and increase strength. In the aspects of preaging, the matrix doesn’t promote G.P.Zones(Ⅰ) after 70℃×14h preaging, 90℃×14h preaging, or 180℃×10min+70℃×1h preaging, no matter how long AA6022 are treated at 40℃preaging. The matrix promotes the needle-like precipitates after 180℃×10min+70℃×1h preaging, and it has better strength. Although it has better strength, it has lower elongation. In other words, it has worse forming before baking. So AA6022 treated after 150℃×10min+70℃×1h preaging has better bake-hardening.
|| 日本輕金屬學會委員, ”鋁合金之組織與性質”, 日本輕金屬學會, pp.278, 1991|
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