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標題: | 富鎳Ti48.9Ni51.1及Ti48.8Ni51.2形狀記憶合金相變態
行為之研究 Transformation Behavior of Ni-rich Ti48.9Ni51.1 and Ti48.8Ni51.2 Shape Memory Alloys |
作者: | Bo-Yi Li 李柏毅 |
指導教授: | 吳錫侃 |
關鍵字: | 富鎳鈦鎳形狀記憶合金,固溶處理,時效處理,多階麻田散體相變態,Ti3Ni4/Ti2Ni3析出物, Ni-rich TiNi SMAs,As solution-treated,Aging treatment,Multi-stage martensitic transformation,Ti3Ni4/Ti2Ni3 precipitates, |
出版年 : | 2017 |
學位: | 碩士 |
摘要: | 本研究探討富鎳Ti48.9Ni51.1及Ti48.8Ni51.2形狀記憶合金 (SMAs) 在固溶處理後及時效於250~600 ºC之相變態行為。當試片時效於250 ºC和300 ºC時,Ti48.9Ni51.1及Ti48.8Ni51.2 SMAs 發生一階B2↔R相變態;當試片時效於350 ºC和400 ºC時,兩SMAs 皆發生二階B2↔R↔B19’相變態;當試片時效於450 ºC時,兩SMAs 發生三階相變態。當試片時效於500 ºC時,由於Ti3Ni4析出物的大小及分布不均勻之關係,Ti48.9Ni51.1 SMA可觀察到四階相變態而Ti48.8Ni51.2 SMA可觀察到為三階相變態。當試片時效於550 ºC時,兩SMAs 皆在早期時效階段發生三階相變態,而於長時效時間發生二階B2↔R↔B19’相變態。當試片時效於600 ºC時,兩SMAs 皆在早期時效階段發生B2↔B19’1變態,中期時效階段發生B2↔B19’1與B2↔B19’2相變態,而於長時效時間只發生B2↔B19’2相變態,其中B2↔B19’1與Ti3Ni4析出物有關,而B2↔B19’2則與Ti2Ni3析出物相關。本研究透過時效450~600 ºC 後Ti48.9Ni51.1 SMA 之SEM圖來觀察顯微結構及析出物Ti3Ni4及Ti2Ni3之分布,同時也探討經過固溶處理後之Ti50-xNi50+x (x=1.0~1.3 at.%) SMAs之微硬度、熱物理性質及制振能特性等,發現固溶處理後之Ti49Ni51、Ti48.9Ni51.1、Ti48.8Ni51.2 SMAs皆發生B2↔B19’相變態,然而Ti48.7Ni51.3 SMA轉變為應變玻璃型態,且Ti48.7Ni51.3 SMA與Ti48.8Ni51.2 SMA之間的微硬度、熱物理性質等均有顯著的差異。 In this study, Ni-rich Ti48.9Ni51.1 and Ti48.8Ni51.2 shape memory alloys (SMAs) are systematically studied to investigate their transformation behaviors exhibited in as solution-treated specimens and then they are aged at 250 ºC to 600 ºC for different aging times by DSC tests. Both SMAs exhibit a B2↔R transformation when aged at 250 ºC and 300 ºC, and a B2↔R↔B19’ transformation occurs when the specimens aged at 350 ºC and 400 ºC. A three-stage transformation occurs in both SMAs aged at 450 ºC due to the compositional inhomogeneity. When the specimens aged at 500 ºC, the transformation sequence of Ti48.9Ni51.1 SMA is a quadruple-stage transformation, whereas Ti48.8Ni51.2 SMA behaves a three-stage transformation due to the inhomogeneous size and distribution of Ti3Ni4 precipitates at grain interior. When the specimens aged at 550 ºC, a three-stage transformation occurs in both SMAs for the early aging time, and a B2↔R↔B19’ transformation occurs for the longer aging time. Both SMAs’ specimens aged at 600 ºC exhibit B2↔B19’1 for the early aging time, behave B2↔B19’1 and B2↔B19’2 for the middle aging time, and show B2↔B19’2 for the longer aging time. SEM images of Ti48.9Ni51.1 specimens aged at 450~600 ºC are observed. At the same time, Vickers microharness, thermal physical properties and damping characteristics of as solution-treated Ti50-xNi50+x (x=1.0~1.3 at.%) SMAs are also studied. Experimental results indicate a B2↔B19’ martensitic transformation exhibits in as solution-treated Ti49Ni51, Ti48.9Ni51.1 and Ti48.8Ni51.2 SMAs; however, Ti48.7Ni51.3 SMA behaves a strain glass transition. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/77970 |
DOI: | 10.6342/NTU201701707 |
全文授權: | 有償授權 |
電子全文公開日期: | 2027-07-19 |
顯示於系所單位: | 材料科學與工程學系 |
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