| 摘要: | 本論文主要以6022鋁合金(Al-0.6Mg-1.0Si-0.01Cu)為實驗材料，探討不同製程條件對於6022鋁合金時效析出之影響。 實驗中，藉由改變均質化參數、熱滾參數、退火參數、冷滾參數、固溶參數、預時效參數及人工時效參數，並配合光學顯微鏡(OM)、微差掃描分析儀(DSC)、拉伸試驗機、穿透式顯微鏡(TEM)分析，尋找出最適合6022鋁合金之製程，使得6022鋁合金經過人工時效後，能得到較佳的析出強化效果。 由實驗結果得知，6022鋁合金經過570℃×14h均質化處理，再進行490℃熱滾、250℃×5h退火與高冷滾加工量（4mm→1mm），最後選擇560℃×1h固溶˙淬水，除了使晶內的晶出相減少，更可以獲得高濃度過飽和固溶體與較小的再結晶晶粒，故析出強化效果較佳。另外，在預時效與階段式預時效方面，分別以90℃×1h預時效與180℃×1h＋70℃×14h階段式預時效，可獲得最多G.P.Zones(II)及β′的核，對於往後的時效析出有正面助益。由於預時效可以加速G.P.Zones(II)及β′的核生成，所以在人工時效時間的選擇上則不宜過長。以90℃×1h預時效與180℃×1h＋70℃×14h階段式預時效為例，分別進行170℃×1000min與170℃×500min人工時效，方可避免析出相粗大化的問題，進而獲得最佳強度。 This thesis primarily with 6022(Al-0.6Mg-1.0Si-0.01Cu) aluminium alloy for experiment material inquires into the different manufacturing process condition for 6022 the effect of aluminium alloy aging precipitations. In the experiment, by transforming soaking parameter, hot rolling parameter anneal parameter, cold rolling parameter, solution parameter, pre-aging parameter, artificial aging parameter. Also interlock the OM, DSC, TEM, tensile test analyzes, seeking the optimum to match 6022 the manufacturing process of aluminium alloys, make 6022 aluminium alloy through artificial ageing can receive the good precipitation enhances the effect. The results indicate that 6022 aluminium alloys through 570℃ soaking, 490℃hot rolling, 250℃×5h annealing , cold rolling(4mm→1mm) , 560℃×1h solution and water-quench. In addition to making constituents reduced, also acquire high concentration supersaturated solid solution and minor recrystallization grains, so the precipitation enhances the effect better. Besides, In the aspects of pre-aging and step pre-aging, there is positive help with 90℃×1h pre-aging and 180℃×1h＋70℃×14h step pre-aging, can acquire maximum G.P.Zones( II) and β′nucleolus for hereafter precipitations. Due to pre-aging can accelerate G.P.Zones( II) and β′nucleolus are born, on the select of artificial aging time can't super - lengthways. With 90℃×1h pre-aging and 180℃×1h+70℃×14h step pre-aging for instance, Carry on 170℃×500min ,170℃×1000min artificial aging can preventing precipitation phase bulky transformation respectively, acquire the best strength. |
