High damping in Fe-Ga-La alloys: Phenomenological model for magneto-mechanical hysteresis damping and experiment
High damping in Fe-Ga-La alloys: Phenomenological model for magneto-mechanical hysteresis damping and experiment
复制标题
DOI：
10.1016/j.jmst.2020.07.043
复制
发表时间：
2021-05-10
影响因子：
10.9
通讯作者：
Fang, Qianfeng
中科院分区：
文献类型：
--
作者：
Sun, Meng;Balagurov, Anatoly;Fang, Qianfeng
铁磁高阻尼（FHA）合金具有-150 ℃至300 ℃的宽温度范围，在极端环境下具有独特的应用价值。研究了Fe-21 Ga-xLa（x = 0.12wt.%，0.24重量%，0.47重量%，1.18重量%，和2.33重量% La）合金的研究，并提出了一种新的唯象模型。随着La含量的增加，基体中的Laves相（LaGa 2）逐渐增多，阻碍畴运动的阻力也随之增大。结合同步辐射X射线衍射、中子衍射和磁畴观察的结果，认为电阻主要来自三个方面：与基体晶格畸变有关的平均应力、与畴壁面积能增加有关的平均应力和与Laves相诱导的退磁能增加有关的平均应力。与传统的通过退火降低内应力来提高阻尼性能的方法不同，合适的内应力屏障对巴克豪森跳跃的耗能是必不可少的。因此，适当掺杂以平衡DW的电阻和迁移率是提高阻尼能力的可靠途径。同时，对于Fe-Al和Fe-Cr基合金，新模型也有很好的拟合效果。该研究为提高铁磁合金的功能性能提供了理论和实验参考。(C)2021由Elsevier Ltd代表Journal of Materials Science & Technology编辑部出版。
Ferromagnetic high damping (FHA) alloys with a wide temperature range from -150 degrees C to 300 degrees C have unique application value in extreme environments. In the present work, the damping behaviors of Fe-21Ga-xLa (x = 0.12 wt.%, 0.24 wt.%, 0.47 wt.%, 1.18 wt.%, and 2.33 wt.%La) alloys have been studied in detail, and a new phenomenological model has been proposed. With the increase of La content, the Laves phase (LaGa2) in the matrix increases gradually, and the resistance opposing the domain movement increases as well. Combined with the results of synchrotron radiation X-ray diffraction, neutron diffraction, and magnetic domain observation, the resistance mainly comes from three parts: the average stress related to the lattice distortion of the matrix, the average stress related to the increasing area energy of domain walls (DWs), and the average stress related to the increasing demagnetization energy induced by the Laves phase. Different from the traditional method of reducing internal stress through annealing to improve the damping capacity, the proper internal stress barriers are necessary to Barkhausen jumps to dissipate energy. Therefore, proper doping to balance resistance and mobility of DWs is a reliable way to improve damping capacity. Meanwhile, for Fe-Al and Fe-Cr based Alloys, the new model also has a good fitting effect. This study provides a theoretical and experimental reference for improving the functional properties of ferromagnetic alloys. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.