高阻尼TNCH-Z钛合金阻尼机制研究

Research on Damping Mechanism of TNCH-Z Titanium Alloy with High Damping

摘要:

在变频、变温和不同应变振幅下，对不同热处理后的新型阻尼TNCH-Z钛合金的低频阻尼特性进行研究，同时对该合金的声频内耗进行测量。结果表明：室温低频范围内，合金的阻尼性能受应变振幅影响较大：应变振幅增加，合金的阻尼性能随之提高；合金的相变阻尼随频率的加快而降低。由于马氏体相变的影响，合金对温度变化比较敏感。在–50~100 ℃相变范围内，合金的内耗峰值tanφ=0.08（加热）/0.09（冷却），马氏体相的内耗值高于母相的。受到热处理制度的影响，该合金的内耗峰宽化，提高了该合金的使用温度。该合金在声频范围内的内耗值达到10-2级。

Abstract:

The low-frequency damping characteristics of a new kind of titanium alloy TNCH-Z after different heat treatment were investigated by means of DMA (dynamic mechanical thermal analysis) with the frequency, strain and temperature varying. And audio internal friction was measured. The results show that the damping performance of the alloy is increased greatly with strain amplitude increasing under low-frequency at room temperature. The damping capacity of the alloy is decreased with the frequency increasing. Due to the martensitic transformation, the alloy is sensitive to temperature change. Between –50 oC and 100 oC, the internal friction peak value (tan φ) is 0.08 (heating)/0.09 (cooling). The value of internal friction in the martensitic is higher than that in the mother phase. Because of the influence of the heat treatment system, the internal friction peak of the alloy is wide and the temperature is increased. The audio internal friction reaches to the 10-2 level.