2010-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/699406摘要：形狀記憶合金(SMAs)因擁有形狀記憶效應(SME)，超彈性（PE）及不錯的制震能（DC），因而被視為機能材料，並廣泛應用於工程及醫學領域，是一個極具應用潛力的智慧材料。目前研究最透徹的TiNi SMAs其麻田散體變態溫度一般在60℃或以下，但由於微機電及醫學等領域應用上需求麻田散體變態溫度能在100~200℃之間，也因而100~200℃間之高溫SMAs之研究是有其必要性。主持人研究多年之TiNi基高溫SMAs，其中Ti50-yNi50Zr(Hf)y合金含Zr(Hf)量在20at%以下是有≦350℃之變態溫度的，唯其脆性使之無法加工而實用化。本計畫擬針對Ti50-xNi50Scx(x< 2 at.%)三元合金加以研究其變態溫度及形狀記憶特性等。此外，本計畫也擬針對價較廉之NiMn基高溫SMAs來從事研究，利用合金設計尋求100~200℃變態溫度之適當成分的合金，由報導得知此等合金亦屬脆性材料，若能添加元素 (例如Ti等)及微化晶粒應可改善其脆性。本計畫擬尋求擁有適當延展性且又具高溫SMAs性能之Ti-Ni-Sc及NiMn基三元合金，擬由VAR熔煉方法來加以製備，包括冷/熱軋延以及其後之熱處理等，都將一一加以探討。此外，SMAs的變態點、SME/PE/DC以及顯微組織及結構等也將深入了解，並由此研究出價較廉且擁有優異性能之Ti-Ni-Sc及NiMn基高溫SMAs。而本計畫開發之高溫SMAs在學術上可以進一步了解其各種性能之外，也能使SMAs之工程應用更加擴大。<br> Abstract: The characteristics of shape memory effect (SME), superelasticity (PE) and high damping capacity (DC) exhibited in TiNi shape memory alloys (SMAs) are usually regarded TiNi SMAs to be smart materials and they have high potential for applying in the engineering and medical fields. However, the shortage of TiNi SMAs is that their transformation temperature, Ms, is not higher than 60oC and thus restricts their applications in MEMS, medical fields, etc. The purpose of this project is looking for the NiMn-based high temperature SMAs which have the Ms temperature in the range of 100~200oC. According to our past experience on the studies of high-temperature SMAs, Ti50-yNi50Zr(Hf)y SMAs have Ms:50~350oC with y:0~20at%, but their intrinsic brittleness limits the practical engineering application. Ti50-xNi50Scx (x< 2 at.%) SMAs have better working ability than Ti-Ni-Zr(Hf) SMAs and are worthy to investigate their transformation temperature, shape memory properties, etc. In this project, we will study ternary Ni-Mn-based high temperature SMAs which have Ms temperature in the range of 100~200oC. In order to improve the intrinsic brittleness, titanium will be added in these designed Ni-Mn-based SMAs. At the same time, Ti50-xNi50Scx (x< 2 at.%) SMAs will also be studied in this project. Vacuum arc remelter(VAR) will be used to prepare these SMAs in which hot/cold rolling and suitable heat treatment will be investigated. At the same time, the Ms temperature, microstructure and SME/PE/DC characteristics associated with these designed SMAs will also be studied. From experimental results, the beneficial properties of Ni-Mn-Ti and Ti-Ni-Sc SMAs will be more understood. Accordingly, Ni-Mn-Ti and Ti-Ni-Sc high temperature SMAs with good characteristics will be fabricated and these SMAs could have more engineering applications in the near future.高溫形狀記憶合金Ti-Ni-Sc三元合金NiMn基三元合金Ms溫度形狀記憶特性High temperature shape memory alloysTi-Ni-Sc SMAsNi-Mn-Ti SMAsMs temperatureshape memory properties.