测量了高纯Ｆｅ－Ｎｂ－Ｃ合金的４００－８５０℃内耗，发现一个峰温度随测量应变振幅变化的高温（６６６－７４０℃）磁机械滞后阻尼内耗峰。研究了峰的特征、出现、消失条件及升降温、频率、振幅、变形与退火等因素对峰的影响．提出了用内耗实验确定材料中阻碍铁磁畴壁Ｂａｒｋｈａｕｓｅｎ跳动应力的方法和合金中产生磁机械滞后阻尼－温度峰（Ｑ_ｍ~（－１）－Ｔ）的物理机制。
The internal friction at 400-850℃ in high-pure Fe-Nb-C alloys has been measured, and a large stress-dependent magnetomechanical hysteresis damping peak of which the peak temperature varies from 666 to 740℃ as strain amplitude changes was discovered. The conditions of the peak appearing and disappearing, some characters of the peak and the effect of some factors such as ascending and descending temperature, frequency,amplitude, defoimation and annealing etc. on the peak have also been studied. The method to determine the internal stress σst and σi obstructing Barkhausen jumps of domains by internal friction experiment and the physical mechanism producing the magnetomechanical hysteresis damping-temperaturepeak in the alloy were proposed. Correspondent: JI Jingwen,Department of Physics, Northeastern University, Shenyang 110006
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