本實驗於Fe70Pd30鐵磁性形狀記憶合金中添加1~6at.% Pt及1~9at.% Au取代部分Pd,利用快速凝固旋淬法製作薄帶試片,探討Fe-Pd合金添加第三元素,對材料的相變化溫度、磁性質、磁伸縮與形狀記憶效應的影響。
快速凝固旋淬法製作的薄帶會因熱流方向,在free side形成沿厚度方向成長的柱狀晶,且有良好的織構。在剛製作完成的Fe70Pd30-xPtx及Fe70Pd30-xAux薄帶試片都沒有bct相產生。每添加1at.%Pt元素使FePdPt薄帶試片Af相變化溫度下降13.4K,添加1at.%Au元素則使FePdAu薄帶試片Af上升8.5K,所有添加1~9at.% 的Au之FePdAu薄帶試片相變化溫度皆超過室溫。
FePdPt及FePdAu各成分薄帶試片織構皆比Fe70Pd30薄帶試片好, 添加Pt越多使織構越好,Au添加越多則使織構漸漸下降。除了製程上的偏差,添加Pt或Au元素皆使Fe-Pd鐵磁記憶合金晶粒尺寸下降。添加Pt元素越多使磁晶體異向性增大,矯頑磁場增大,磁伸縮值提高,Pt5具有最高磁伸縮值。添加Au元素越多室溫存在的fct麻田散相越多。Fct麻田散相矯頑磁場較大,初始磁化率較小,飽和磁化量較大,磁伸縮值較大。再綜合各項的影響後,Au7及Au3具有最高的磁伸縮值。
快速凝固旋淬法製程中因引入殘餘應力使薄帶試片具有自發雙向形狀記憶效應,添加Pt及Au薄帶試片皆具有良好單向形狀記憶效應,經過一次拘束訓練即可具有良好的雙向形狀記憶效應,在FePdPt薄帶試片中以Pt5雙向記憶回復率最佳,FePdAu薄帶試片則以Au7薄帶試片雙向記憶回復率最佳,Au7又比Pt5好。
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