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利用XRD、SEM和电阻应变片等方法研究了Tb0.3Dy0.7(Fe1-xPtx)1.95(x=0.00,0.02,0.04,0.06,0.08)合金的微结构和磁致伸缩特性。结果表明:当Pt含量x≤0.06时,合金为具有立方MgCu2型结构的Laves单相,Pt置换Fe导致合金相的晶格常数a线性增大;磁致伸缩系数λ随Pt含量的增加不断减小,随外磁场(H≤500mT)的增大而单调增大;当合金在950℃退火4h,可获得较好的磁伸缩性能。在x=0.08时,合金中出现微量第二相Fe3Dy,证实Pt在Tb0.3Dy0.7Fe1.95合金中的最大固溶度小于5at%。
The microstructures and magnetostriction properties of Tb0.3Dy0.7 (Fe1-xPtx) 1.95 (x = 0.00,0.02,0.04,0.06,0.08) alloys were investigated by means of XRD, SEM and strain gauges. The results show that when the content of Pt is less than or equal to 0.06, the Laves single phase with cubic MgCu2 structure is formed. The substitution of Fe by Pt causes the lattice constant a of the alloy phase to increase linearly. The magnetostriction coefficient λ decreases with the increase of Pt content Small, monotonously increasing with the increase of external magnetic field (H≤500mT). When the alloy is annealed at 950 ℃ for 4h, the magnetostrictive properties are better. At x = 0.08, a trace of the second phase Fe3Dy appears in the alloy, confirming that the maximum solubility of Pt in the Tb0.3Dy0.7Fe1.95 alloy is less than 5 at%.