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標題: | Ti48.5Ni36.5Cu15形狀記憶合金塊材 冷滾與時效處理之顯微結構與機械性質研究 Research on Microstructures and Mechanical Properties of Coll-Rolled and Aged Ti48.5Ni36.5Cu15 Shape Memory Alloy |
作者: | 周健權 Kian-Kenn Chew |
指導教授: | 陳志軒 Chih-Hsuan Chen |
關鍵字: | TiNiCu 形狀記憶合金,Ti(Ni,Cu)2析出,時效處理,熱循環穩定性,形狀記憶效應,冷滾,退火, TiNiCu shape memory alloy,Ti(Ni,Cu)2 precipitate,aging treatment,thermal cyclic stability,shape memory effect,cold-roll,annealing, |
出版年 : | 2023 |
學位: | 碩士 |
摘要: | 本研究對Ti48.5Ni36.5Cu15塊材進行時效與冷滾再時效處理,並針對其相變態行為、顯微結構、熱循環穩定性、超彈性與形狀記憶效應進行探討。Ti48.5Ni36.5Cu15 經過1050°C一小時固溶後,結構中的Ti(Ni,Cu)2完全回熔於基地內。固溶後的Ti48.5Ni36.5Cu15經過冷滾達到27%厚度減量,晶粒細化與差排抑制了麻田散體的產生,試片進入應變玻璃態。固溶與冷滾後的試片在300°C、400°C、500°C皆有相變態溫度上升的現象,顯示Ti(Ni,Cu)2析出於結構當中。固溶處理後試片經過400°C一小時時效處理,能析出長度為3.5nm,寬度為0.6nm的片狀奈米Ti(Ni,Cu)2析出。厚度減量27%的冷滾試片在經過400°C一小時時效處理後,擁有長度為550nm,寬度為60nm的奈米晶粒,且在垂直於滾壓方向(ND)顯示<111>織構(texture)。該試片在第150次熱循環與第1次循環中,Mp溫度下降0.2°C,擁有良好的熱循環穩定性。形狀記憶效應試驗中,該試片在500MPa應力下達到5.3%應變,只有0.08%殘留應變。 This research investigated aging treatment and cold rolling followed by aging treatment of Ti48.5Ni36.5Cu15. The phase transformation behaviors, microstructures, thermal cyclic stability, superelasticity and memory effect are studied. After solution treatment at 1050°C for 1 hour. Ti(Ni,Cu)2 phase completely dissolved into the matrix. Cold-rolled Ti48.5Ni36.5Cu15 with 27% thickness reduction contains nanograins and dislocations which suppress the formation of martensite and turn the specimen into strain glass state. Both solution-treated and cold-rolled specimens undergone increment in transformation temperature after aging in 300°C, 400°C and 500°C which indicates the formation of Ti(Ni,Cu)2 precipitates in both structures. Solution treated specimen followed by 400°C 1 hr aging precipitates plate-like nanoscale Ti(Ni,Cu)2 with length of 3.5nm and width of 0.6nm. Cold-rolled specimen with 27% thickness reduction followed by 400°C 1 hr aging contains nanograin with legth of 550nm and width of 60nm. It shows <111> texture on normal direction. The specimen experienced a temperature drop of 0.2°C in Mp between the 1st and 150th cycle indicated good thermal cyclic stability. In shape memory effect experiment, the specimen achieved a total strain of 5.3% with only 0.08% irrecoverable strain under a stress of 500MPa. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/89049 |
DOI: | 10.6342/NTU202302997 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 機械工程學系 |
文件中的檔案:
檔案 | 大小 | 格式 | |
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ntu-111-2.pdf | 7.77 MB | Adobe PDF | 檢視/開啟 |
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