Fe及Fe83Ga17和Fe83Ga17Pr0.3合金的微结构与磁致伸缩性能  

Microstructure and Magnetostriction of Fe,Fe_(83)Ga_(17) and Fe_(83)Ga_(17)Pr_(0.3) Alloys:a Comparative Study

作　　者：赵丽娟 田晓[1] 姚占全[2] 江丽萍[3] ZHAO Lijuan;TIAN Xiao;YAO Zhanquan;JIANG Liping(Key Laboratory for Physics and Chemistry of Functional Materials,School of Physics and Electronic Information,Inner Mongolia Normal University,Hohhot 010022;School of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot 010018;Baotou Research Institute of Rare Earths,Baotou 014030)

机构地区：[1]内蒙古师范大学物理与电子信息学院,功能材料物理与化学自治区重点实验室,呼和浩特010022 [2]内蒙古农业大学水利与土木建筑工程学院,呼和浩特010018 [3]包头稀土研究院,包头014030

出　　处：《材料导报》2018年第16期2832-2836,共5页Materials Reports

基　　金：国家自然科学基金(51661027;51461001);内蒙古自然科学基金(2014MS0540)

摘　　要：本研究对比研究了Fe、Fe_(83)Ga_(17)及Fe_(83)Ga_(17)Pr_(0.3)磁致伸缩材料的微结构与磁致伸缩性能。采用真空非自耗电弧炉在氩气保护下熔炼制备了合金样品。采用X射线衍射仪(XRD)和光学显微镜(OM)分析观察了合金样品的晶体结构和显微组织。采用扫描电镜配合能谱仪(SEM/EDS)测定了稀土Pr元素在Fe_(83)Ga_(17)Pr_(0.3)合金中的分布。通过电阻应变法测量了合金的磁致伸缩性能。结果表明:Fe和Fe_(83)Ga_(17)合金均由单一的bcc结构A2相组成,而Fe_(83)Ga_(17)Pr_(0.3)合金由A2主相和少量的富稀土Pr相组成。稀土Pr掺杂使合金中的A2相沿〈100〉晶向择优取向。Fe及Fe_(83)Ga_(17)和Fe_(83)Ga_(17)Pr_(0.3)合金的微观组织分别呈现细长的条状晶、晶粒粗大的等轴晶和晶粒细小的柱状晶。Fe的磁致伸缩系数为负值,而Fe_(83)Ga_(17)和Fe_(83)Ga_(17)Pr_(0.3)合金的磁致伸缩系数均为正值,三种材料的磁致伸缩系数绝对值的排序为Fe<Fe_(83)Ga_(17)<Fe_(83)Ga_(17)Pr_(0.3)。The present work aimed to comparatively analyze microstructure and magnetostriction of Fe,and Fe83Ga17 and Fe83-Ga17Pr0.3 magnetostrictive alloys.We successfully prepared the alloys by employing a non-consumable vacuum arc melting furnace and applying a protective argon atmosphere,and observed crystal structures and surface morphologies of the alloys via X-ray diffraction(XRD),optical microscopy(OM)and scanning electron microscopy(SEM)combined with energy dispersive spectroscopy(EDS),respectively.The magnetostriction coefficients of the alloys were measured by means of resistance strain method.The results indicated that Fe and Fe83Ga17 alloy consist of a single phase of A2 with bcc structure,while the Fe83Ga17 Pr 0.3 alloy is composed of A2 phase and a small amount of Pr-rich phase.The Pr doping into Fe83Ga17 alloy facilitates the preferred growth in(100)orientation of A2 phase in the alloy.The microstructures of the Fe,Fe83Ga17 and Fe83Ga17 Pr 0.3 alloys present anisometric morphology with strip-like grains,the equiaxial morphology with coarse grains and a columnar structure with fine grains,respectively.The magnetostriction coefficient of Fe is negative,whereas the magnetostriction coefficients of Fe83Ga17 and Fe83Ga17 Pr 0.3 alloys are positive.The magnetostrictions of three alloys can be sequenced as Fe83Ga17 Pr 0.3>Fe83Ga17>Fe.

关 键 词：磁致伸缩 FE-GA合金 稀土掺杂 微结构 

分 类 号：TM273[一般工业技术—材料科学与工程]