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Damping Characteristics of Cold-Rolled and Annealed Equiatomic TiNi Shape Memory Alloy

机译:冷轧退火等原子TiNi形状记忆合金的阻尼特性

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Damping capacity and storage modulus of cold-rolled and annealed TisoNiso SMA are systematically investigated by DSC and DMA tests. The specimens annealed at 500℃ for 1 ~ 72 h and annealed at 650℃ for short time can all reach a high tan δ value and a deep storage modulus minimum during B2→R transformation. This reveals that the occurrence of R-phase can strongly soften the storage modulus and thus promote the damping capacity of Ti_(50)Ni_(50) SMA. The specimens anneaed at 650℃ fpr longer time have a lower tan δ value due to the diminishing of R-phase formation. Therefore, a good damping capacity associated with a significant softening storage modulus can be acquired by suitably control the annealing conditions of cold-rolled Ti_(50)Ni_(50) to generate adequate of R-phase premartensite.
机译:通过DSC和DMA测试系统地研究了冷轧和退火的TisoNiso SMA的阻尼能力和储能模量。在B2→R转变过程中,在500℃下退火1〜72 h,在650℃下短时间退火的试样都可以达到较高的tanδ值和极小的储能模量。这表明,R相的出现可以大大软化储能模量,从而提高Ti_(50)Ni_(50)SMA的阻尼能力。较长时间在650℃退火的样品由于R相形成的减少而具有较低的tanδ值。因此,通过适当地控制冷轧Ti_(50)Ni_(50)的退火条件以产生足够的R相马氏体,可以获得与显着​​的软化储能模量相关的良好的阻尼能力。

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