本計畫所使用材料為AA7005及AA7075高強度鋁合金的擠製棒材進行退火並使用不同的鍛造條件(包括鍛造模具及鍛造溫度)，隨後進行固溶、焠水與時效處理(T73)。研究目的在於探討不同模具型態、鍛造溫度及鍛造縮減率等，對微結構包括二次相顆粒、動態再結晶、差排滑移、晶粒細化等影響，接著分析不同鍛造參數對成型後鋁合金機械性質與抗腐蝕能力的影響。近年來，因環保意識的抬頭及溫室效應帶來的異常氣候，人們對於環保的議題越加重視，降低能源消耗的課題也愈發重要。汽車輕量化有助於降低能源的消耗，以高強度鋁合金取代較重的鋼鐵材料成為現今學術界及業界發展的方向。7000系列鋁合金是高強度合金，這合金容易形成應力腐蝕，為避免此現象的發生通常使用這合金會採用過時效T73熱處理，但過時效熱處理會降低鋁合金的強度。鍛造製程有助於提高鋁合金的強度及韌性，因此調查不同鍛造參數對性質的影響，可最佳化鋁合金強度及韌性，這是本實驗的目的。研發成果可提供給業界作為設計與製造高強度鋁合金的技術資料。 ;Effects of different forging processes on the mechanical properties and corrosion resistance of AA7005, and AA7075 aluminum alloys were investigated in this study. The AA7005 and AA7075 extruded bars were used to undergo annealing treatment and subject to different forging processes (include different dies, forging temperatures and reduction ratios). Then, the forged samples were removed to carry out solution treatment, water quenched and T73 artificial aging treatment. The target of this study is aiming to investigate the microstructures of forged samples, including second phase particles, dynamic recrystallization, dislocation tangling and grain refinement. In addition, the effect of deformation on microstructure, mechanical properties and corrosion resistance would also be investigated.Due to the climate change and the greenhouse effect on environment, the issue of energy consumption becomes more and more important. Lightweight vehicles help reducing energy consumption, and the use of high-strength aluminum alloys becomes the trend in automobile sector. The high strength 7xxx series aluminum alloys are susceptible to stress corrosion cracking. A T73 heat treatment is usually adopted for decreasing stress corrosion, but over-aging heat treatment reduces the strength of aluminum alloy. Using the forging process could improve the strength and toughness of aluminum alloy. The topics of this study is to assess the strength and corrosion resistance of forged aluminum alloys (cold and hot forgings). The experimental results offer technical data for design and for making high strength forged aluminum alloys for industry.
