High damping in Fe-Ga-La alloys:Phenomenological model for magneto-mechanical hysteresis damping and experiment  

作　　者：Meng Sun Anatoly Balagurov Ivan Bobrikov Xianping Wang Wen Wen Igor S.Golovin Qianfeng Fang 

机构地区：[1]Key Laboratory of Materials Physics,Institute of Solid State Physics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China [2]Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China [3]Frank Laboratory of Neutron Physics,Joint Institute for Nuclear Research,Dubna,Russia [4]Lomonosov Moscow State University,Moscow,Russia [5]Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China [6]National University of Science and Technology“MISIS”,Moscow,Russia

出　　处：《Journal of Materials Science & Technology》2021年第13期69-80,共12页材料科学技术（英文版）

基　　金：supported financially by the National Natural Science Foundation of China(No.51971212);the Russian Science Foundation(No.19-72-20080)。

摘　　要：Ferromagnetic high damping(FHA)alloys with a wide temperature range from-150℃to 300℃have unique application value in extreme environments.In the present work,the damping behaviors of Fe-21 Ga-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(LaGa_(2))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 ave rage 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.

关 键 词：Magneto-mechanical hysteresis damping Laves phase(LaGa_(2)) Internal stress distribution Neutron-diffraction patterns Domain walls 

分 类 号：TG132[一般工业技术—材料科学与工程]