高阻尼TNCH合金的相变与阻尼性能研究

Damping properties of TNCH titanium alloy utilizing transformation

研究了新型阻尼合金的马氏体相变、内耗以及它们之间的关系。结果表明,在室温低频范围内合金主要经历了3个阶段:低温马氏体状态,两相共存状态与母相状态。低温马氏体时,TNCH合金的高阻尼主要由B19′马氏体变体、孪晶界面产生。相变过程中的阻尼特性与相变时新相/旧相的相界面数量有关。合金处于母相时其阻尼主要来源于合金的晶体缺陷。

The martensitic transformation and the internal friction was investigated for TNCH titanium alloy by using the X-ray diffraction,the scanning calorimeter （DSC） and dynamic mechanical analyzer（ DMA）,as well as the relationship between them.The results showed that the TNCH alloys in the low-frequency range at room temperature had gone through three stages：low-temperature martensite.two-phase coexistence state and the mother phase state. First,the high damping properties of TNCH alloy were mainly induced by monoclinic martensitic phase （B19＇）and twin interface.The second is that the damping characteristics during the phase transformation is concerned with the quantity of phase interface in new/old phase.The damping properties originated from the crystal dislocation when the alloy was in mother phase state.