研究了(Fe0.81Ga0.19)100-xBx(x=0—20)合金的相组成和磁致伸缩特性. 结果表明: x=1时, 铸态合金由A2(bcc Fe(Ga))相和Fe2B相组成; x=5, 10, 15, 20时, 为A2相、L12(-Fe3Ga)相和Fe2B相组成. 800℃保温3 h油淬后, 当x=1, 5时, 为修正的D03(Fe3Ga)相和Fe2B相组成; x=10, 15, 20时,为修正的D03相、L12相和Fe2B相组成. 加入B元素后铸态合金的饱和磁致伸缩系数s在x=1和10处出现峰值; 油淬后随着B含量增加, 合金的磁致伸缩系数先增大后减小, 其中x=10合金的s比相应油淬Fe81Ga19合金的s增加了80%. 油淬态合金, 随B含量添加, 析出Fe2B相, 导致Fe-Ga合金基体中修正的D03相的Ga含量相应提高, 磁致伸缩提高; 随着B含量的进一步增加, 合金中出现了过多的Fe2B相和L12相, 磁致伸缩下降.
The phase structure and magnetostriction were first studied in the small atom B element doped (Fe0.81Ga0.19)100-xBx(x=0~20) alloys. The as-cast (Fe81Ga19)100-xBx alloys for x= 1 exhibits A2 and Fe2B phases, while possess Fe2B and A2+L12 eutectic phases for x=5, 10, 15, 20; Oil-quenched at 800℃ for 3h (Fe81Ga19)100-xBx alloys for x=1, 5 exhibit Modified-D03 and Fe2B phases, while possess Fe2B and Modified-D03+ L12 eutectic phases for x=10, 15, 20. The saturation magnetostriction (λs) of the as-cast (Fe0.81Ga0.19)100-xBx (x=0~20) alloys exhibits two peaks when x=1 and x=10; the λs of the oil-quenched alloys increases first and then decreases with increasing B content. The λs of (Fe81Ga19)90B10 reaches the maximum, 80％ larger than the oil-quenched Fe81Ga19, attributing to the emergence of Modified-D03 phases in the oil-quenched alloys.
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