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  4. A study on low frequency damping capacity of TiNiCu shape memory alloys and Zr based amorphous alloys
 
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A study on low frequency damping capacity of TiNiCu shape memory alloys and Zr based amorphous alloys

Date Issued
2005
Date
2005
Author(s)
Hsieh, Ren-Jay
DOI
zh-TW
URI
http://ntur.lib.ntu.edu.tw//handle/246246/55354
Abstract
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.
Subjects
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
Type
thesis
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ntu-94-R92527041-1.pdf

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