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通过真空感应熔炼、锻造及热处理等工艺,制备了Fe-17 mass%Mn减振合金,采用热膨胀法测量材料的相变点,并进行组织观察和分析。在不同温度和应变条件下,测试了材料的阻尼性能,并分析其振幅内耗效应。结果表明,实验合金在低温低应变振幅下表现出反常振幅效应,在高温高应变振幅下出现振幅内耗峰。由于溶质原子在不同温度下的动性不同,位错在不同振幅下的运动速度不同,以及溶质原子和位错线之间的“跟、拖、甩”作用等,可将G-L模型中的钉扎点看成可动的,来解释此情况。
The Fe-17 mass% Mn damping alloy was prepared by vacuum induction melting, forging and heat treatment. The phase transition point of the material was measured by thermal expansion method and the microstructure was observed and analyzed. Under different temperature and strain conditions, the damping performance of the material was tested and the effect of amplitude internal friction loss was analyzed. The results show that the experimental alloy exhibits anomalous amplitude effect at low temperature and low strain amplitude, and amplitude internal friction peak appears at high temperature and high strain amplitude. Due to the different mobility of solute atoms at different temperatures, the movement of dislocations at different amplitudes, and the role of solute atoms and dislocation lines between the “follow, drag, rejection,” can be GL model Pinning point as a movable, to explain this situation.