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通过测定Fe-Mn合金的层错几率以及借助G—L位错脱钉模型,研究了深冷处理和温度对其阻尼性能的影响。进一步揭示了Re-Mn合金的高阻尼机制.采用倒扭摆测试合金的阻尼性能、SEM观察显微组织、XRD测定物相体积分数和层错几率.结果表明,Fe-Mn合金的高阻尼机制与Shockley不全位错的脱钉运动相关;深冷处理增加了合金的层错几率,即增加了Shockley不全位错数量。阻尼性能得到提高;升高温度降低了Shockley不全位错的脱钉力,在一定应变振幅下,温度越高可以产生脱钉的Shockley不全位错数量就越多,合金的阻尼性能升高.
The influence of cryogenic treatment and temperature on the damping properties was studied by measuring the stacking fault probability of the Fe-Mn alloy and by using the G-L dislocation decoupling model. The damping mechanism of Re-Mn alloy was further revealed.The damping properties of the alloy were tested with inverted torsional pendulum, the microstructure was observed by SEM, and the phase volume fraction and stacking fault probability were determined by XRD.The results show that the high damping mechanism of Fe- Shockley is not full dislocation of the nail-free movement related; cryogenic treatment increases the probability of alloy stacking fault, that increase the number of incomplete Shockley dislocation. The damping capacity is improved. The higher the temperature, the lower the Shockley’s total dislocation dislocation force. At a certain strain amplitude, the higher the temperature, the more the Shockley’s total number of dislocations can be generated, and the more the damping capacity of the alloy increases.