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Fe_(85)Ga_(15)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DO_3相的析出,α-Fe相和非对称DO_3结构的Fe_3Ga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.
Fe_(85)Ga_(15) alloy ribbons were prepared in different wheel speeds by the melt-spinning. The measured results show that magnetostriction and microstrueture of the Fe_(85)Ga_(15) alloy is related to the cooling rate of ribbons and the maximum magnetostriction coefficient, - 125 × 10~6, is obtained in the ribbon prepared with a wheel speed of 20m/s, whereas, the magnetostriction is not completely saturated. The results of XRD and TEM observation show that there is a split for the overlaped diffraction peak of a-Fe and modified DO_3 structure and the crystal arrange along the thickness direction.The increase of the cooling rate can restrain the precipitation of the long-range oreder DOs-type phase and Ga-rieh clusters emerge in the ribbons of Fe_(85)Ga_(15). The strong shape magnetic anisotropy and special crystal structure result in a giant magnetostriction of Fe-Ga alloy ribbons.
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