Fe-Ga-Tb磁致伸缩合金的组织结构与性能

发布时间：2018-04-14 16:39

本文选题：稀土Tb + Fe-Ga合金　；参考：《河北工业大学》2015年硕士论文

【摘要】：Fe-Ga合金作为一种新型的磁致伸缩智能材料,在驱动器、传感器和换能器上的应用引起人们的兴趣。因其低饱和磁化场、高磁导率、高抗拉强度以及可以轧制、脆性小等特点,具有广阔的应用前景。本文着重研究了Fe81Ga19Tbx(x=0,0.2,0.4,0.6,0.8)系列合金铸态、快淬态、热轧态以及经退火处理后的微观组织结构、磁致伸缩应变以及相关磁性能和力学性能。实验结果如下:添加稀土Tb使铸态Fe81Ga19Tbx合金的饱和磁致伸缩应变显著增大,其中Fe81Ga19Tb0.2合金可达到205×10-6。我们认为,饱和磁致伸缩应变显著提高的原因是“含铽DO3相”和高磁矩的“铽原子对”的形成以及〈100〉择优取向度的增大。铸态合金以A2相为主,Tb未进入A2相晶格中,而是富集于晶界的“含Tb的DO3相”中。快淬态Fe81Ga19Tbx合金薄带保持无序α-Fe的bcc结构。实验表明,其磁致伸缩应变显著增大,外磁场垂直于薄带带面时,Fe81Ga19Tb0.2薄带的磁致伸缩应变达到-1500×10-6。稀土Tb以GaTb和Ga6Tb的形式富集在晶界处。随Tb含量的增加,薄带饱和磁化强度、矫顽力、剩磁均略有降低,且磁滞后很小。热轧态Fe81Ga19Tbx合金的相组成仍然以A2相为主,存在部分DO3相。通过退火处理其磁致伸缩应变显著增大,其中Fe81Ga19Tb0.8合金磁致伸缩应变达到380×10-6。随着Tb含量的增加,合金的抗拉强度显著增大,达到698MPa。退火处理使合金的维氏硬度明显降低。
[Abstract]:As a new type of magnetostrictive smart material, Fe-Ga alloy has attracted much attention in the applications of actuators, sensors and transducers.Because of its low saturation magnetization field, high permeability, high tensile strength, rolling ability, low brittleness and so on, it has a broad application prospect.In this paper, the microstructure, magnetostrictive strain, magnetic properties and mechanical properties of Fe81Ga19TbxCX (0.2A0.40.40.60.80) series of alloys have been studied, including as-cast, quenched, hot-rolled, and annealed microstructure, magnetostrictive strain, and related magnetic and mechanical properties.The experimental results are as follows: the saturation magnetostrictive strain of as-cast Fe81Ga19Tbx alloy is significantly increased by adding rare earth TB, and the Fe81Ga19Tb0.2 alloy can reach 205 脳 10 ~ (-6).We think that the reason for the remarkable increase of saturated magnetostrictive strain is the formation of "terbium atom pair" with terbium DO3 phase and high magnetic moment, and the increase of < #number0# > preferred orientation.The as-cast alloy mainly consists of A2 phase and TB is not in the A2 phase lattice, but is enriched in the "Tb-containing DO3 phase" at grain boundary.The ribbons of rapidly quenched Fe81Ga19Tbx alloy keep the bcc structure of disordered 伪 -Fe.The results show that the magnetostrictive strain increases significantly and the magnetostrictive strain of Fe81Ga19Tb0.2 thin strip reaches to -1500 脳 10 ~ (-6) when the external magnetic field is perpendicular to the strip surface.TB is enriched at grain boundaries in the form of GaTb and Ga6Tb.With the increase of TB content, the saturation magnetization, coercivity and remanence of the thin strip decrease slightly, and the hysteresis is very small.The phase composition of hot rolled Fe81Ga19Tbx alloy is still A2 phase, and some DO3 phase exists.The magnetostrictive strain of Fe81Ga19Tb0.8 alloy increases significantly after annealing, and the magnetostrictive strain of Fe81Ga19Tb0.8 alloy reaches 380 脳 10 ~ (-6).With the increase of TB content, the tensile strength of the alloy increases significantly, reaching 698 MPA.The Vickers hardness of the alloy was obviously decreased after annealing.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB381

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