R-doping effects on the magneto-mechanical properties, including Young’s modulus (E) at magnetic field (H), that is ΔE effect, and magnetostriction (λ), of Fe_86.8Ga₁₃R_0.2 alloys (R = Tb and Dy) are studied. ΔE_s/E₀ of Fe₈₇Ga₁₃ alloy is 6%, and it is significantly enhanced to 12% by doping Dy, but reduced to 4.5% for Tb-doped alloy. The trend of magnetostriction sensitivity (dλ/dH) of Fe_86.8Ga₁₃R_0.2 alloys with R is similar to that of ΔE_s/E₀ with R. Most importantly, strong ΔE effect due to high dλ/dH for Fe_86.8Ga₁₃Dy_0.2 alloy favors magnetic applications. Large ΔE effect is considered to correlate to magnetic softening and lattice softening by doping Dy. For Tb-doped alloy, the increase of λ_s might be related to the decrease of Fe content in the matrix due to the appearance of minor Tb₂Fe₁₇ phase. However, the decrease of dλ/dH might result from increased coercivity and decreased permeability related to the introduction of Tb₂Fe₁₇ phase and result in reduced ΔE effect. The findings of this work provide an effective pathway of enhancing the magneto-mechanical properties for Fe-rich Galfenol alloys.

R掺杂对Fe _86.8 Ga ₁₃ R _0.2合金（R = Tb和Dy）的磁机械性能的影响，包括磁场（H）的杨氏模量（E）（即ΔE效应）和磁致伸缩（λ）。被研究。ΔE_小号/ E ₀的Fe ₈₇镓₁₃合金是6％，它是由掺杂的Dy显著增强至12％，但减少至4.5％，铽掺杂的合金。铁磁致伸缩灵敏度（Dλ/ DH）的趋势_86.8镓₁₃ - [R _0.2的合金，其中R是类似的ΔE的_小号/ E ₀与R.最重要的是，强ΔE效果由于高Dλ/ DH为铁_86.8Ga ₁₃ Dy _0.2合金有利于磁性应用。大ΔE效应被认为与通过掺杂Dy的磁软化和晶格软化相关。对于掺Tb的合金，由于出现次要的Tb ₂ Fe ₁₇相，λs_的增加可能与基体中Fe含量的减少有关。然而，dTb / dH的降低可能是由于与Tb ₂ Fe ₁₇相的引入有关的矫顽力和磁导率降低，并导致ΔE效应降低。这项工作的发现为增强富铁Galfenol合金的磁机械性能提供了有效途径。