摘要
本研究利用DMA針對 、 、 (at%)合金，在經過高溫熱軋與常溫冷軋20~50%並加以熱處理後進行制振能性質之分析。在溫度掃描模式中，以3℃/min的冷卻速率，頻率與振幅分別設為 及 時， 與 合金的暫態峰，其阻尼值均可達到 以上，而其儲存模數仍有30GPa以上。而在持溫模式中維持恆溫 小時後， 於 暫態峰的阻尼值與最高點( )相比降幅達92%，相較之下在較低溫側的弛豫峰其降幅僅24%，衰減後之恆定阻尼值為 ，可與 在 內耗峰的恆定阻尼值 相比擬，也較具工程實用性。在多頻掃描模式中的低頻範圍 內(一定振幅 下)，本實驗所使用之各合金在各單相區間內的阻尼值均隨頻率的增加而略微減少。在多應變掃描模式中的振幅介於 時 (一定頻率 下)，各單相的阻尼值均隨應變量之增加而提高，因此可預期只要應變量夠大，各合金在麻田散體相中的阻尼值即可達到 以上之高制振能，例如 合金在接近常溫的 ℃( 內耗峰)下，其振幅在 以上即可。
並列摘要
Damping properties of cold-rolled and heat-treated , and (in at%) shape memory alloys are investigated using Dynamic Mechanical Aanlyzer (DMA). The damping values, , at transient peaks of and are both over 0.1 while their storage modulus is still above 30GPa under temperature sweep mode at cooling rate of 3℃/min with frequency and amplitude and respectively. Under constant temperature mode, after keeping the peak temperature for hour, the value at the transient peak of descends 92% while that at the relaxation peak only descends 24%. For the latter case, the value is which is comparable to that of at transformation, so both of them have highly potential engineering applications. The of alloys in their single phase decreases with increasing the frequency in the low frequency range of (uniform amplitude in ) under multi-frequency mode. When the amplitude ranged from to (uniform frequency in ) under multi-strain mode, the of each phase increases with increasing the strain. Therefore, the damping value of alloys in martensite phase can achieve high damping capacity provided that the strain is high enough. For example, of alloy at ℃( transformation peak) is when the amplitude exceeds .