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(bccFe(Ga))相和Fe2B相组成;x=5,10,15,20时,为A2相、L12(α-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λs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λs比相应油淬Fe81Ga19合金的λs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.
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