吳錫侃2006-07-252018-06-282006-07-252018-06-282004http://ntur.lib.ntu.edu.tw//handle/246246/12468本整合型計畫以增進形狀記憶合金(SMAs)之性能為研究目的，包括TiNi 基、Cu 基及Fe 基SMAs 的形狀記憶效應(SME)、超彈性(PE)及制震能(DC)等性能之改進。在第二年度裡本整合型計畫接續第一年度之成果，繼續探討了TiNi 基及Fe 基SMAs。研究結果發現大量冷軋並再結晶退火之Ti50Ni50 SMA 會因晶粒大小之不同而有四重之相變態，且低溫短時間退火會有最好之PE 特性，而中溫長時間退火會有最佳之制震能。本研究同時探討TiNi-Fe SMA經一次在R相之拘束處理便可以達到雙向SME 的行為，發現應與R 相的形成有關;對Fe-30at.% Pd SMA而言，其雙向SME 及鐵磁性因Pt 之添加而獲改善。本研究同 時探討Fe 基SMA 的SME ， 發現 Fe59Mn30Si6Cr5 合金之SME 會受織構之影響，適當的熱機處理可以使其SME 性能增 進，同時其壓縮應力鬆弛程度也不大，在約8 小時後可達穩定。The aim of this 3-year-term integrated project is focused on the properties improvement of TiNi-based, Cu-based and Fe-based shape memory alloys (SMAs). These properties include shape memory effect (SME), superelasticity (PE) and damping capacity (DC). In the second year, TiNi-based and Fe-based SMAs are investigated. The experimental results show the severely cold-rolled and recrystallization annealed Ti50Ni50 SMA has the 4-steps transformation sequence due to the different grain-size distribution. The optimal annealing conditions can be obtained for the better PE and DC properties. We also investigate the reason why TiNi-Fe SMAs can exhibit the two-way SME after being “constrain-treated” at R-phase temperature. This feature is related to the formation of R-phase in TiNi-Fe SMAs. The addition of Pt in Fe-30at.% Pd SMA is found to improve its two-way SME and ferro-magnetic properties. In the study of Fe-based SMAs, we find that the SME of Fe59Mn30Si6Cr5 alloy is related to its texture and can be improved by the suitable thermo-mechanical treatments. The experimental results also reveal that the compressive stress relaxation of Fe59Mn30Si6Cr5 is not obvious and approaches to steady-state after 8hrs loading.application/pdf79825 bytesapplication/pdfzh-TW國立臺灣大學材料科學與工程學研究所鈦鎳基及鐵基形狀記憶合金晶粒大小形狀記憶效應超彈性性能改進TiNi- and Fe-based shape memory alloys (SMAs)Grain sizeshape memory effectSuperelasticityProperties improvement.reporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/12468/1/922216E002007.pdf