https://scholars.lib.ntu.edu.tw/handle/123456789/73917
標題: | 鈦鎳銅形狀記憶合金與鋯基非晶質合金
低頻制振能之研究 A study on low frequency damping capacity of TiNiCu shape memory alloys and Zr based amorphous alloys |
作者: | 謝人杰 Hsieh, Ren-Jay |
關鍵字: | 鈦鎳銅形狀記憶合金;鋯基非晶質合金;制振能;阻尼值tanδ;振幅;充氫處理;TiNiCu shape memory alloys;Zr-based amorphous alloys;Damping Capacity tanδ;Amplitude;Hydrogenation | 公開日期: | 2005 | 摘要: | 本研究針對鈦鎳銅三元形狀記憶合金與鋯基非晶質合金Zr55Al10Ni5Cu30之制振能進行探討。對Ti50Ni35Cu15及Ti51Ni41Cu8形狀記憶合金而言,其變態峰之阻尼值在頻率1Hz,昇降溫速率為3℃/min時,均可達到tanδ0.05以上;但如保持恆溫30分鐘以上,則其阻尼值則會大幅下降,降幅可達82%以上。而其弛豫峰的阻尼值則不會因持溫而大幅下降,且其阻尼值會隨振幅增加而上昇,兩者呈自然指數成長關係。鋯基非晶質合金之制振能雖較鈦鎳銅形狀記憶合金為低,但強度高,如增大其振幅,亦可使其阻尼值上昇,且振幅與其阻尼值亦呈自然指數成長關係。充氫處理對厚度較薄之鋯基非晶質合金制振能有明顯改善,在100mA/mm2之電流密度下充氫2小時,可使薄帶鋯基非晶質合金在頻率1Hz下,昇速溫速率為3℃/min時之tanδ值大於0.01,但較厚之鋯基非晶質合金則無法有明顯改善,其原因可能為厚度對氫原子擴散至試片內部之差異所導致。 Abstract Ren-Jay Hieh This study focused on the damping capacity of TiNiCu ternary shape memory alloys and of Zr-based amorphous alloys, Zr55Al10Ni5Cu30. The damping values, tanδ, at transient peaks of Ti50Ni35Cu15 and Ti51Ni41Cu8 are both over 0.05 at cooling rate of 3℃/min with frequency 1Hz; after keeping the peak temperature for 30mins and above, the tanδ values of Ti50Ni35Cu15 and Ti51Ni41Cu8 are both descends over 82%. On the other hand, the tanδ values at relaxation peaks don’t drops dramatically after keeping peak temperature, however, they ascends with increasing amplitude. Comparing to TiNiCu shape memory alloys, Zr-based amorphous alloys have lower damping capacity but higher strength, However, its tanδ values increase with larger amplitude. Hydrogenation improves the damping capacity of Zr-based amorphous alloys with thinner thickness remarkably, the tanδ value at cooling rate of 3℃/min with frequency 1Hz exceeds 0.01 after hydrogenation under 100mA/mm2 current density for 2 hrs, but hydrogenation can’t improve the damping capacity of Zr-based amorphous alloys with higher thickness as well, it might due to the difference of H atoms diffusing into specimen result from the different thickness. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/55354 | 其他識別: | zh-TW |
顯示於: | 材料科學與工程學系 |
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ntu-94-R92527041-1.pdf | 23.53 kB | Adobe PDF | 檢視/開啟 |
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