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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。
The effects of frequency, temperature and different strain amplitudes on the low-frequency damping properties of a new type of damping TNCH-Z titanium alloy after heat treatment were studied. Meanwhile, the acoustic internal friction of the alloy was measured. The results show that the damping property of the alloy is greatly affected by the strain amplitude at room temperature and low frequency. The strain amplitude increases and the damping property of the alloy increases. The phase transition damping of the alloy decreases with the increase of the frequency. Due to the influence of martensitic transformation, the alloy is more sensitive to temperature changes. Within the range of -50 ~ 100 ℃, the internal friction peak tan φ = 0.08 (heating) /0.09 (cooling), the internal friction value of the martensite phase is higher than that of the parent phase. Affected by the heat treatment system, the alloy’s internal friction peak width, raising the temperature of the alloy. The alloy in the audio frequency range of internal consumption reached 10-2 level.