等通道轉角擠型(ECAE)製程具有許多優點，擠製時可旋轉角度來控制材料之變形結構，而經由多次擠製可使材料的塑性變形量達到相當大的程度，且擠製後之材料截面積不會改變，同時亦可獲得均勻且細晶之材料結構。於鋁合金中添加Sc元素能有效細化晶粒及提升合金再結晶溫度，且Al3Sc相於高溫下能有效使晶粒保持細小且穩定之結構。
本研究利用等通道轉角擠型(ECAE)製程對不同Sc含量之Al-5Mg-0.7Mn合金進行擠製，藉以瞭解ECAE製程與Sc含量(0wt.%、0.3wt.%、0.58wt.%)對合金微結構及機械性質之影響，並觀察不同溫度下進行退火處理後之微結構穩定性及其影響程度，且對擠型後之細晶材料進行高溫拉伸測試，評估其超塑性表現。
實驗結果指出，添加0.3wt.%Sc即可使鑄態Al-5Mg-0.7Mn合金晶粒細化，而合金強度因細晶強化作用而提升。於300℃下進行ECAE Route BC之方式擠型，可使合金達到細化效果且獲得均勻之微結構，而合金內部極易發生動態回復作用，使得加工硬化率下降。鑄造晶出之Al3Sc相於高溫下能有效阻止晶界移動，提升合金再結晶溫度，此有助於提升合金之高溫延伸率。於450℃下以1×10-2S-1及5×10-2S-1速率進行拉伸，含Sc之合金延伸率皆可達300%以上。

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