王文雄2006-07-252018-06-282006-07-252018-06-282004http://ntur.lib.ntu.edu.tw//handle/246246/12479本實驗以真空石英膠囊熔煉配置三種錫含量為3~5wt%之銅-鋅-錫合金來探討其形狀記憶效應之相關特性。熔煉出來的鑄錠經800℃均質化與熱輥軋後，試片分別在800℃~870℃進行固溶後再淬火於-10℃的10%NaOH 溶液中，利用示差熱分析儀(DSC)及四點電阻量測來測定其變態溫度隨成分變化之情形。熱處理後以掃描式電子顯微鏡(SEM)及穿透式電子顯微鏡(TEM)觀察各試片之顯微組織及相變化，並進行微硬度試驗及形狀回復率測試，此外也以X-ray 繞射實驗分析其結晶構造。實驗結果顯示，由X 光繞射及穿透式電子顯微鏡分析可知，Cu-Zn-Sn 合金之母相為B2(orderBCC)結構，麻田散體為M9R 結構。經50 次熱循環，其熱穩定性及形狀回復率仍維持相當不錯。且Cu-Zn-Sn 合金在恆溫時效期間，其析出物的形貌會隨著時效溫度的上升而有所變化，由DSC 的觀察，可發現在228℃與342℃之間有兩個吸熱峰，第一個吸熱峰(250℃)為α1 plate 產生所造成，其結構為M9R，隨著溫度的上升，其析出物的結構會轉變為FCC 之α phase，而第二個吸熱峰(300℃)則為γ析出物的產生，結構為BCC。In this experiment, three kinds of Cu-Zn-Sn alloys with 3~5wt% Sn were melted in evacuated quartz capsules. After homogenized and hot rolled at 800℃, the specimens were quenched into -10℃ NaOH solutions from 800℃~870℃. The effects of alloy additions on the transformation temperatures were determined by differential scanning calorimetry （DSC）and by means of measuring the variation of resistivity with temperature. Microstructures and crystal structures of the specimens after heat treatments were examined by scanning electron microscope (SEM), transmission electron microscope (TEM), and x-ray diffraction (XRD). The results show that the crystal structures of parent phase and martensite of Cu-Zn-Sn alloy are B2 and M9R respectively. After fifty thermal cycles, they still have good thermal stability and shape recovery. The morphologies of the precipitates were changed with different aging temperature. Two endothermic peaks between 228℃and 342℃ were found on DSC heating curve, the first peak (250℃) is α1-plate whose structure is M9R, and the second peak (300℃) is a BCC γ precipitate.application/pdf1361443 bytesapplication/pdfzh-TW國立臺灣大學材料科學與工程學研究所形狀記憶效應形狀回復率shape memory effectshape recoveryreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/12479/1/922216E002030.pdf