2014-08-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/691832摘要：鈦鎳基形狀記憶合金因擁有形狀記憶效應(SME)及超彈性(PE)而被視為是機能材料之一，申請人多年來深入研究巨觀尺度之塊材及微觀尺度之箔片TiNi基SMAs之合金設計、製程控制、固溶/析出硬化、顯微結構及SME/PE性能等，發現塊材與箔片在量測SME/PE性能時，因測試用試片尺寸之不同，試片晶粒大小之不同以及量測儀器之不同等，使巨觀及微觀尺度下TiNi基SMAs所顯現之性能也有所差異。本計畫擬利用二年時間來研究TiNi基SMAs在巨觀尺度塊材下及微觀尺度箔片下量測所得的SME/PE性能做一比較，並充分了解造成此等差異之原因，及掌握此等差異對SMAs醫/工應用時之影響。根據申請人過去之研究經驗，本計畫在第一年度時擬選取Ti49Ni51塊材及Ti50.4Ni49.5Si0.1 SMAs箔片，在第二年度擬選擇近Ti49Ni51成分之塊材及Ti50.1Ni49.7Si0.2箔片SMAs，不論塊材或箔片都借由時效以得Ti3Ni4之析出硬化，再分別量測其變態溫度、硬度及SME/PE性能等並比較之。由於SMAs之工程及醫工應用有往輕薄短小的方向走，而一般TiNi SMAs之量測設備尚以塊材為主，對微觀尺度下箔片/薄膜之性能測試，例如Nanoindentation等設備之使用並不普遍，故本計畫之研究成果將有助於將TiNi SMAs在巨觀尺度下之數據應用於微觀尺度下之微機械等，這也是SMAs所需面臨及解決的問題。<br> Abstract: TiNi-based shape memory alloys (SMAs) exhibit the uncommon properties of shape memory effect (SME), superelasticity (PE) and have high potential for applying to engineering/medical fields. In the past years, the PI of this project studied the alloys design, process control, solid solution/precipitation hardening, microstructure and SME/PE properties of macro-scale (bulk) and micro-scale (ribbon) TiNi-based SMAs. Owing to the difference of the testing specimen size, the inherent grain size and the testing equipment in between the macro-and micro-scale specimen, the SME/PE properties measured from bulk and ribbon TiNi SMAs should be different. The purpose of this 2-year project is aimed to compare the difference in SME/PE and other properties exhibited in bulk/ribbon TiNi SMAs. In the first year, according to the PI experience, Ni-rich Ti49Ni51 and Ti50.4Ni49.5Si0.1 SMAs will be investigated. In the second year, other Ni-rich TiNi SMA with its composition near Ti49Ni51 and Ti50.1Ni49.7Si0.2 SMA will be studied. All these SMAs will be solid-soluted and aged to precipitation-hardening by Ti3Ni4 precipitates, and then tested to reveal their SME/PE and other properties. The trend of industrial products, especially for 3C and medical products, is toward the miniaturization. However, most of the testing equipments are used to measure the macro-scale properties exhibited in bulk TiNi SMAs, instead of the micro-scale ones in TiNi ribbons. For example, the nanoindentation tester is uncommon to be used in the laboratory to characterize the alloys properties. Therefore, the outcome of the research results from this project can extend the abundant macro-scale data of TiNi SMAs to the micro-scale SMAs applications. This is an important issue for the TiNi SMAs applications and needs to be solved.鈦鎳基形狀記憶合金巨觀及微觀尺度形狀記憶效應超彈性性能差異TiNi-based Shape Memory alloysMacro- and Micro-scaleShape Memory EffectSuperelasticityProperties difference