本研究重點係應用低錳(Mn)、具較高鋅(Zn)/鎂(Mg)比的AA7003鋁合金，來探討Mn元素含量對中高強度鋁合金熱處理製程的影響。
本研究內應用硬度量測、拉伸試驗、導電度量測、應力腐蝕測試、穿透式電子顯微鏡觀察（TEM）等方法，求出適用於AA7003鋁合金之T6、T73與RRA熱處理製程之參數組合，再將研究結果與AA7005鋁合金的研究結果及文獻資料進行分析比較，探討Mn、Zn、Mg等合金元素對熱處理製程之影響。
研究結果得到適用於AA7003鋁合金各式熱處理參數分T6:470℃/40min.+80℃/14hr.+
120℃/42hr.；T73：470℃40min.+80℃/14hr.+107℃/8hr.+168℃/7hr.；RRA：T6+180℃
/8min.+120℃/42hr.。
分析比較結果顯示低Mn含量之AA7003鋁合金具有較高的溶質原子(Zn、Mg)擴散速率，且AA7003鋁合金之Zn/Mg比高於AA7005鋁合金，具有較多機率形成MgZn2析出相。此二因素均可增進析出強化效率，縮短T6、T73及RRA熱處理製程的處理時間，惟低Mn的效果似較顯著。

The objective of this study is to investigate the effect of Mn content on the heat treatment processes of medium-high aluminum alloys using AA7003 aluminum alloy, which possesses low Mn content and relatively high Zn/Mg ratio, as a carrier. Hardness test, tensile test, electrical conductivity measurement, transmission electron microscopy and stress corrosion test were conducted to seek for the most proper combinations of process parameters for the T6, T73 and RRA processes of AA7003 aluminum alloy.
Experimental results were, then, compared with those previously obtained from AA7005 aluminum alloy and with results obtained from literature to study the effect of Mn content on the heat-treatment process of medium-high strength aluminum alloy. The most suitable process parameters for T6 are 470℃/40min.+80℃/14hr.+120℃/42hr.；for T73 are 470℃/40min.+80℃/14hr.
+107℃/8hr.+168℃/7hr.； and for RRA are T6+180℃/8min.+120℃/42hr.。
Analyses also showed that both low Mn content and high Zn/Mg ratio can improve the aging efficiency of aluminum alloy, and shorten the process time required for T6, T73 and RRA processes. But the effect produced by low Mn content is more prominent.

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