【作者】 江民红； 顾正飞； 周怀营；

【Author】 JIANG Min-hong GU Zheng-fei ZHOU Huai-ying (Department of Information Material Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China)

【机构】 桂林电子科技大学信息材料科学与工程系；

【摘要】 对退火后超磁致伸缩合金中富稀土相析出物进行了研究,采用扫描电镜-能谱分析、X 射线衍射和电阻应变片技术,着重研究了析出物的析出根源、相组成、相结构以及磁致伸缩性能．结果表明：过量稀土 Ho 的存在,是析出物析出的根本原因；析出物中富含稀土,主要包括立方结构 DyFe₂、HoFe₂,六方结构 Dy₅Si₃、Tb₅Si₃及立方结构 Dy₂O₃、Ho₂O₃等物相；在磁场强度为400kA/m 时,析出物的磁致伸缩系数约为100 ×10^-6,此时,已经饱和且远小于基体棒的磁致伸缩量 (＞500×10^-6)．配方中适当过量稀土,并采取适当的热处理工艺,可望制备高性能的稀土超磁致伸缩材料．更多还原

【Abstract】 Adopting SEM,EDS,XRD and strain gages testing technology,separating reason,phase compositions,phase structure and magnetostrictive characteristic of the matter separated out are studied emphatically.The results show that the root cause of separating out lies in the existence of excess rare earth Ho.In the matter separated out,there are abundant rare earths which exist as DyFe₂,HoFe₂,DysSi₃,Tb₆Si₃,Dy₂O₃,HO₂O₃ compounds and so on.When magnetic field intensity is 400 kA/m,magnetostriction constant λ of separated crystal is about 100×10^-6and less than λ(＞500×10^-6)of GMM rod.High performance GMM can be prepared by adding excess rare earths appropriately and making use of suitable annealing process.更多还原