本研究主要是探討鑄態 A390 鋁合金 (Al-17% Si-4.5% Cu-O.55%Mg) 經固溶及時效處理後，對其抗拉強度、硬度及耐磨耗性等機械性質的影響。實驗設計採用田口方法，其控制因子有除氣棒型式、磷調質含量、澆鑄溫度、固溶溫度、固溶時間、自然時效、時效溫度及時效時間等八項。
實驗結果顯示，陰氣棒的孔徑對抗拉強度有影響，但對硬度及耐磨耗性則無顯著影響。欲得較高抗拉強度應以 0.006% 磷進行調質，而要求較高硬度及耐磨耗性則需以 0.009% 磷進行調質。澆鑄溫度並未如預期為愈低愈好而以了20℃較佳。固溶溫度過高會造成晶界重熔使抗拉強度降低，故欲得較高抗拉強度則以480℃為佳，而要求較高硬度及耐磨耗性則可選擇500℃為固溶溫度。而回溶時間均以4小時最適當。自然時效以一天為最佳。人工時效以175℃最優。要求較高耐磨耗性及抗拉強度，時效時間以8小時較好，欲得較高硬度則以12小時為佳。
本實驗對各製程參數還提供預測式，以供工業界調整其製程參數來符合其成品之目標值。藉此期能提供工業界在使用 A390 鋁合金時之參考。

The purpose of this research is to realize the effects of solution and artificial ageing treatment to A390 Aluminum Alloy in the aspects of tensile strength, hardness and wear resistance. We adopted Taguchi Method as the experiment design and the control factors included the types of degassing pipe, the modification quantity of phosphorus, the temperature for casting, the temperature and duration of solution treatment and artificial ageing and the duration of natural ageing.
The results of this experiment reveal, the diameter of holes on the degassing pipe has some influence over tensile strength but make little difference to hardness and wear resistance. To acquire high tensile strength, modification of 0.006% phosphorus is needed and 0.009% for high hardness and wear resistance. The temperature of casting is best at 720℃ for high hardness and tensile strength but 740℃ better for wear resistance. Solution treatment at 480℃ for 4 hours is helpful to tensile strength and 500℃, 4 hours better for hardness and wear resistance. Natural ageing for one day is good for all. Artificial ageing at 175℃ for 8 hours is beneficial to tensile strength and wear resistance, and 12 hours to hardness.
This research offers equations of prediction that can predict the value for tensile strength, hardness and wear resistance. Using those equations, the manufacturers can adjust the processing parameters to meet their needs. We hope this research is valuable to those who employ A390 Aluminum Alloy.