Abstract Rare earth doping could greatly enhance the magnetostrictive properties of Fe-Ga as-cast alloys. But the origin of this large magnetostrictive property has always been controversial. Some researchers think that this large magnetostrictive property is induced by the distortion of A2 lattice. While others think this is sourced from the formation of (0 0 1) oriented textures. In order to solve this controversy, the microstructure and magnetic properties of La, Pr, Sm and Y doped Fe-Ga as-cast alloys were examined by scanning electron microscopy and energy dispersive spectroscopy (SEM/EDS), X-ray diffraction (XRD), electron backscattered diffraction (EBSD), vibrating sample magnetometer (VSM) and strain gauge method in this paper. And the results show that the reason for the increase of the magnetostrictive properties of Fe-Ga cast alloys caused by rare earth doping is closely related to whether the rare earth elements enter the A2 crystal lattice. When the rare earth elements cannot enter into the A2 lattice of the alloy sample, the cause of the large magnetostriction is mainly attributed to the (0 0 1)-oriented columnar crystals. However, when rare earth elements can enter into the A2 crystal lattice of the alloy sample, the cause of large magnetostriction is mainly due to residual stress, or distortion caused by rare earth elements entering into the A2 crystal lattice, and secondly by the (0 0 1)-oriented columnar crystals.

中文翻译：

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稀土掺杂Fe-Ga铸态合金大磁致伸缩性能的起源

摘要 稀土掺杂可以大大提高Fe-Ga铸态合金的磁致伸缩性能。但这种大磁致伸缩特性的起源一直存在争议。一些研究人员认为这种大的磁致伸缩特性是由 A2 晶格的畸变引起的。而其他人则认为这是源于 (0 0 1) 取向纹理的形成。为了解决这一争议，通过扫描电子显微镜和能量色散谱 (SEM/EDS)、X 射线衍射 (XRD) 检测了 La、Pr、Sm 和 Y 掺杂的 Fe-Ga 铸态合金的显微组织和磁性能。 )、电子背散射衍射 (EBSD)、振动样品磁强计 (VSM) 和应变计法。结果表明，稀土掺杂引起Fe-Ga铸造合金磁致伸缩性能增加的原因与稀土元素是否进入A2晶格密切相关。当稀土元素不能进入合金样品的A2晶格时，磁致伸缩大的原因主要是(0 0 1)取向的柱状晶体。然而，当稀土元素能够进入合金样品的A2晶格时，产生大磁致伸缩的原因主要是残余应力，或稀土元素进入A2晶格引起的畸变，其次是(0 0 1) 取向柱状晶体。当稀土元素不能进入合金样品的A2晶格时，磁致伸缩大的原因主要是(0 0 1)取向的柱状晶体。但是，当稀土元素能够进入合金试样的A2晶格时，产生大磁致伸缩的原因主要是残余应力，或稀土元素进入A2晶格引起的畸变，其次是(0 0 1) 取向柱状晶体。当稀土元素不能进入合金样品的A2晶格时，磁致伸缩大的原因主要是(0 0 1)取向的柱状晶体。但是，当稀土元素能够进入合金试样的A2晶格时，产生大磁致伸缩的原因主要是残余应力，或稀土元素进入A2晶格引起的畸变，其次是(0 0 1) 取向柱状晶体。