臺灣博碩士論文加值系統

本研究是以往復式擠型法擠製不同Al、Zn含量的鎂合金(Mg-10~28 wt%Al-1~3 wt% Zn)，探討元素含量對微結構、硬度、常溫拉伸性質及抗蝕性的影響，並尋找最佳的成份及製程。
實驗結果顯示，加入鋁含量愈多，β相比率愈高，硬度愈高，而密度只有些微上升，鑄錠經往復式擠型十次，可得到晶粒細化與Mg17Al12散佈相細化的效果，並消除鑄造時的孔洞及巨偏析現象。
添加鋁含量可增加降伏強度，但伸長率有明顯下降趨勢，較高的擠型溫度或擠型後施以400 ℃退火處理皆能提高伸長率，其中以10 wt%Al提高最多，就強度及伸長率的綜合表現來看，Al含量約15 wt%的鎂合金最佳。
此外Mg-15Al-1Zn也擁有最小的腐蝕電流密度及重量損失，因此經往復式擠型的Mg-15Al-1Zn鎂合金深具應用價值，值得更深入的研究開發。

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