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采用熔体快淬方法制备了不同辊速(v=12m/s、15m/s、20m/s)条件下的Fe85Ga15合金薄带样品,对薄带样品的组织结构和磁致伸缩性能进行了研究。结果表明,合金薄带的组织结构和磁致伸缩性能与快淬时的冷却速度密切相关,v=20m/s辊速条件下制备的薄带在磁场为45kA/m时,其磁致伸缩系数λ达-125×10-6,伸缩曲线尚未完全饱和。对薄带组织形貌的观察表明,薄带样品内晶粒沿薄带厚度方向呈现出取向性排列。XRD分析表明,辊速的提高可以抑制有序DO3相的析出,α-Fe相和非对称DO3结构的Fe3Ga相衍射峰发生重叠并有劈裂现象。TEM分析表明,合金基体中存在着富Ga原子团簇。薄带样品大的磁致伸缩系数主要来源于样品强的形状各向异性和非平衡制备条件下合金内部的特殊晶体结构。
The Fe85Ga15 alloy thin strip samples with different roll speeds (v = 12m / s, 15m / s, 20m / s) were prepared by melt quenching. The microstructure and magnetostriction properties of the samples were studied . The results show that the microstructure and magnetostriction of the alloy ribbon are closely related to the cooling rate during quenching. The magnetostriction coefficient of the ribbon prepared under the condition of v = 20m / s is 45kA / m λ up to -125 × 10-6, stretching curve has not yet fully saturated. The observation of the morphology of the ribbons showed that the grains in the ribbon samples were oriented in the direction of the thickness of the ribbons. XRD results show that the increase of the roll speed can suppress the precipitation of the ordered DO3 phase, and the diffraction peaks of the Fe3Ga phase in the α-Fe phase and the asymmetric DO3 structure overlap and are cleaved. TEM analysis shows that there are Ga-rich clusters in the alloy matrix. The large magnetostrictive coefficient of the ribbon sample mainly comes from the special crystal structure inside the alloy with strong shape anisotropy and non-equilibrium preparation.