Fe₈₁Al₁₉Tb_x (x$=$0, 0.05, 0.1, 0.2, 0.3, 0.4) alloys were prepared by a non-consumable vacuum arc melting technique under an inert argon gas atmosphere. The microstructures of the alloys were studied by X-ray diffraction (XRD) and scanning electron microscopy combined with an energy dispersive spectroscopy (SEM/EDS). The magnetic properties and magnetostriction coefficients of the alloys were measured by a vibrating sample magnetometer (VSM) and adifferential resistive strain sensor, respectively. The results show that the Fe₈₁Al₁₉ alloy consists of a single A2 phase with bcc structure, whereas the Tb doped Fe₈₁Al₁₉ alloys are composed of the A2 phase and a small amount of rare earth-rich phase. The doping of the rare earth element Tb makes the Fe₈₁Al₁₉ alloy preferentially oriented along with the <100> crystal direction. With the increase of Tb content, the magnetostriction coefficient of the alloy first increases and then decreases. When x=0.1, the magnetostriction coefficient reaches the maximum, which is 146 $\times$ 10⁻⁶. Compared with the as-cast Fe₈₁Al₁₉ alloy (27 $\times$ 10⁻⁶), it increases by 441%. The enhanced magnetostrictive properties are mainly attributed to the preferred orientation along <100> of A2 phase of the Tb doped Fe₈₁Al₁₉ alloys and lattice distortion caused by the small amount of rare earth atoms entering the Fe–Al alloy lattice.

Fe ₈₁ Al ₁₉ Tb _x ( x$=$0, 0.05, 0.1, 0.2, 0.3, 0.4) 合金是在惰性氩气气氛下通过非消耗性真空电弧熔炼技术制备的。采用 X 射线衍射 (XRD) 和扫描电子显微镜结合能谱仪 (SEM/EDS) 研究合金的显微组织。合金的磁性和磁致伸缩系数分别通过振动样品磁强计（VSM）和差分电阻应变传感器测量。结果表明，Fe ₈₁ Al ₁₉合金由单层体心立方结构的 A2 相组成，而 Tb 掺杂的 Fe ₈₁ Al ₁₉合金由 A2 相和少量的富稀土相组成。稀土元素 Tb 的掺杂使 Fe₈₁ Al ₁₉合金沿<100>晶向优先取向。随着Tb含量的增加，合金的磁致伸缩系数先增大后减小。x= 0.1时，磁致伸缩系数达到最大值，为146$\times$10 ^-6。与铸态 Fe ₈₁ Al ₁₉合金（27$\times$10 ^-6 )，增加了 441%。增强的磁致伸缩性能主要归因于 Tb 掺杂的 Fe ₈₁ Al ₁₉合金沿 A2 相的 <100> 择优取向和少量稀土原子进入 Fe-Al 合金晶格引起的晶格畸变。