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  • 學位論文

鎂合金與鈦鎳銅形狀記憶合金制振能之研究

Damping Capacity of Mg alloys and TiNiCu SMAs

指導教授 : 吳錫侃
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摘要


本研究針對Ti51Ni49-XCuX形狀記憶合金與鎂合金之制振能進行 探討。對Ti51Ni41Cu8及Ti51Ni40Cu9形狀記憶合金而言,於頻率為1Hz, 昇降溫速率為3℃/min下退火於650℃×48hr時,在室溫附近擁有最寬 的變態峰,且其tanδ值高達0.14以上;若於變態峰之溫度保持恆溫一 小時後,其阻尼值會大幅下降,但Ti51Ni41Cu8變態峰之阻尼值仍有 0.0355 。650℃ 退火48hr 之Ti51Ni40Cu9 在頻率為1~80Hz 時, B19→B19’變態峰(20~25℃)之阻尼值高達0.036以上,且麻田散體 相之阻尼值會隨著振幅之增加而上昇,兩者呈線性成長關係,而振幅 為50μm時,於0℃下tanδ值可達0.08以上。冷軋延所導入的大量差排 及100℃退火所產生的微細再結晶均能使純鎂與AZ31在室溫下之制 振能大幅提昇,tanδ值均可達0.04以上;但是對Mg-9.5Li-0.5Zn而言, 冷軋延加退火對室溫下制振能的提升並不明顯,然而,冷軋延30%之 Mg-9.5Li-0.5Zn 於高溫時擁有極佳的制振能, 可能因高溫時 Mg-9.5Li-0.5Zn的晶界及α / β 相界面間開始滑移所致。

並列摘要


Damping capacity of Ti51Ni49-XCuX(x:6~9at%)shape memory alloys(SMAs)and magnesium alloys was studied. Ti51Ni41Cu8 and Ti51Ni40Cu9 SMAs cold-rolled and annealed at 650℃×48h have the significant transformation peaks at room temperature in which the tanδ value can reach 0.14 at the cooling rate 3℃/min and frequency 1Hz. After keeping isotherm at the peak temperature for 1h, the tanδ value of Ti51Ni41Cu8 is still above 0.03. The B19→B19’ transformation peak (20~25℃)of cold-rolled and annealed at 650℃×48h has its tanδ≧0.36 with the frequency 1~80Hz. In addition, the martensite phase of this cold-rolled and annealed alloy Ti51Ni40Cu9 SMA increases its tanδ value with the increasing amplitude and exceeds 0.08 with amplitude 50μm at 0℃. Cold-rolling and recrystallization annealing at 100℃can improve tanδ values of AZ31 and pure magnesium at room temperature (tanδ≧0.04), but these effects are not obvious for Mg-9.5Li-0.5Zn alloy. However, excellent damping capacity of 30 % cold-rolled Mg-9.5Li-0.5Zn alloy can be obtained at high temperature(T>150℃) and is regarded as a result of the onset of grain boundary sliding and of α / β phase boundary sliding.

參考文獻


經濟與資訊服務中心科技專案成果,2001。
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Compounds, 355 (2003) 31.
2. “Proceedings of the International Symp. On High Damping
Takeudri, J. Alloys and Compounds, Vol.355 (2003).

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蔡文力(2009)。AZ80及LAZ1110鎂合金制振能之研究〔碩士論文,國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342/NTU.2009.01032

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