【摘要】 研究了Fe83Ga17Tby(y=0,0.2,0.4,0.6,0.8)合金的显微组织结构和磁致伸缩性能。XRD显示:Fe83Ga17Tby铸态合金以A2相为主,有少量DO3、DO19和L12相;L12和DO3相随铽含量的增加而增加,铽促进了Fe83Ga17合金(200)织构的形成;背散射电子像及能谱点分析显示合金加入铽后,晶粒从等轴晶转变为柱状晶,铽富集于晶界。铽添加导致Fe83Ga17磁致伸缩性能增加,其最佳添加量是0.2 at%,Fe83Ga17Tb0.2在低场下磁致伸缩系数可达1.5×10-4;铽的外层电子影响自旋-轨道耦合,可能是导致磁致伸缩性能增加的原因。更多还原

【Abstract】 The microstructure and magnetostriction of Fe83Ga17Tby(y=0, 0.2, 0.4, 0.6, 0.8) alloys were investigated. Results show that the cast alloys are mainly composed of A2 phase with a little L12, DO3and DO19phase. L12phase and DO3increase with the increasing of Tb content in Fe83Ga17Tby alloys; ternary additions of Tb element have conduced to the formation of(200) texture from the binary Fe-Ga alloy; equiaxed grains change into columnar grains and Tb grain boundary enrichment are observed by backscattering electron images and point analysis in the ternary alloys of Tb addition. Magnetostriction is strengthened by accession of Tb. The most felicitous Tb addition is0.2at%, and Fe83Ga17Tb0.2can produce magnetostrictive strain of 1.5×10-4in low field. Spin-orbit coupling is affected by outer shell electron which might result in magnetostriction enhancement.更多还原