Mn掺杂对Fe_(81)Al_(19)合金磁致伸缩和输运性质的影响

Influence of Mn Doped in Fe_(81)Al_(19) Alloys on Their Magnetostriction and Electronic Transport Property

为改善并提高Fe-Al磁致伸缩合金的性能,熔炼制备Fe81-xMnxAl19(x=0～24)系列合金多晶块体,并研究Mn元素掺杂替代对Fe81Al19合金的结构、磁性、磁致伸缩及输运性质的影响.结果表明:Fe81-xMnxAl19系列合金的磁致伸缩系数随Mn元素质量分数的增加而降低,这是由生成有序第二相和磁能积密度降低所致;Mn元素掺杂提高了Fe-Al多晶合金的电阻率和Fe-Al磁致伸缩合金的交流频率使用范围;Mn元素掺杂替代降低了Fe-Al多晶合金的各向异性,提高了低场磁致伸缩效应.

The paper reports on the effect of Mn substituting for Fe on the magnetostrictive and related properties of Fe81-xMnxAl19（x=0~24） alloys by melting.The doped samples were prepared in polycrystalline form and were all single phase bcc.The experimental results show that the magnetostriction observed for Fe81Al19 can’t be enhanced by doped Mn at a maximum of x=24 because of the appearance of the ordered D03 phase.The change in the magnetostrictive coefficient of Fe81Al19 with Mn doping is accompanied by a monotonic increase in resistivity,which is good for reducing the eddy current and useful for magnetic actuator application.We also found that the lattice parameter of the alloys increased with the increase in Mn concentration and the Curie temperature decreased monotonically at the same substitution.