摘要
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 microstructure and magnetic properties of the Tb0.3Dy0.7（Fe1-xPtx）1.95 （x=0.00, 0.02, 0.04, 0.06, 0.08） alloys were investigated by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and resistance strain gauge techniques. It is found that the alloys are the single phase microstructure of MgCu2 cubic Laves when the Pt content is less than 0.06 at%, with a line increase of the lattice parameters with the increase of Pt content. But the magnetostriction coefficients decrease with the increase of Pt content, and increase with the increase of external magnetic fields. When the alloys were heated for 4 h at 950℃, a better magnetostriction effect is obtained. A small amount of RFe3 phase exists when the Pt content is 0.08 at%.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第1期72-75,共4页
Rare Metal Materials and Engineering
基金
广西自然科学基金项目(0575095)资助
