铜模吸铸法制备Fe-Nd-Al-B-Dy合金的结构和磁性能

摘要

In order to improve the glass-forming ability and magnetic properties of the Fe-Nd-Al-B alloy, the effect of Dy addition on the microstructure, magnetic properties and crystallization behavior of the Fe-Nd-Al-B alloy were investigated.The (Fe0.51Nd0.35Al0.10B0.04)100-xDyx(x=0, 1, 3, 6) alloy plate with thickness of 1mm were prepared by suction casting into the copper mold.The glass-forming ability, magnetic properties and thermal stability of the Fe-Nd-Al-B-Dy bulk alloys were investigated by differential scanning calorimetry(DSC), vibrating sample magnetometer (VSM) and X-ray diffraction (XRD).The results show that the little addition of Dy can effectively enhance the magnetic property of the alloy and the alloy shows hard magnetic property.However, the alloy with 6％ addition of Dy shows paramagnetic property.The magnetic properties of the alloys are greatly changed after crystallization.The (Fe0.51Nd0.35Al0.10B0.04)99Dy1 alloy, which shows hard magnetic property as the suction casting sample, shows paramagnetic property after crystallization.%为了进一步改善Fe-Nd-Al-B非晶合金的非晶形成能力和磁性能,研究添加Dy元素对此体系合金的显微结构、磁性能以及晶化行为的影响.利用铜模吸铸法制备厚度为1mm的片状(Fe0.51Nd0.35Al0.10b0.40)100-xDyX(x=0,1,3,6)合金.采用示差扫描量热法(DSC),振动样品磁强计(VSM)和X射线衍射仪(XRD)研究Dy对该系列合金非晶形成能力、磁性能和晶化行为的影响.结果表明,添加少量Dy元素使得合金Fe-Nd-Al-B-Dy的磁性能各项指标大幅度提高,得到较好的硬磁性.然而,当进一步提高Dy含量到6%时,合金呈现顺磁性.Fe-Nd-Al-B-Dy系合金晶化后,磁性能会发生很大转变,其中具有较好硬磁性的(Fe0.51Nd0.35Al0.10B0.04)99Dy1合金在完全晶化后呈现为顺磁性.