凝固速度对Fe_(71.3)Ga_(28.7)合金的相结构及磁致伸缩性能的影响  

Effect of directional solidification rate on the phase structure and magnetostrictive properties of Fe_(71.3)Ga_(28.7)alloy

作　　者：程超 鄢邵文 牟星 刘永庆 张洪平[1] CHENG Chao;YAN Shao-wen;MU Xing;LIU Yong-qing;ZHANG Hong-ping(Department of Functional Materials,Central Iron and Steel Research Institute,Beijing 100081,China;Ningbo Ronbay New Energy Technology Co,Ltd,Yuyao315400,China)

机构地区：[1]钢铁研究总院功能材料研究所,北京100081 [2]宁波容百新能源科技股份有限公司,浙江余姚315500

出　　处：《磁性材料及器件》2021年第6期1-5,共5页Journal of Magnetic Materials and Devices

基　　金：钢铁研究总院自主投入研发专项基金项目(20021770A)。

摘　　要：采用真空感应熔炼法制备铸态Fe_(71.3)Ga_(28.7)合金,通过控制定向凝固过程中Fe_(71.3)Ga_(28.7)合金的凝固速度获得了由不同相结构组成的凝固组织,研究了相组成对材料磁致伸缩性能的影响。结果表明,凝固速度大于72 mm/h时,样品是单一的A2相结构;当凝固速度为36 mm/h时,会形成D0_(3)相+A2相的复合相结构;凝固速度为18 mm/h时,会形成L1_(2)相+A2相的复合相结构。A2相含有L1_(2)相的复合相结构具有比单纯A2相的样品更好的低场磁致伸缩性能,在20 kA/m时达到68×10^(–6)。The as-cast Fe_(71.3)Ga_(28.7)alloy was prepared by vacuum induction melting.In this paper,by controlling the growth rate of Fe_(71.3)Ga_(28.7)alloy during directional solidification,different phase structures were obtained,and the effect of phase composition on magnetostrictive properties was studied.The results show that when the solidification rate is higher than 72 mm/h,the sample obtained is a single A2 phase structure.When the solidification rate is 36 mm/h,the composite structure of D0_(3)+A2 phase will be formed.When the solidification rate is 18 mm/h,the composite structure of L1_(2)+A2 phase will be formed.The results show that the composite structure with L1_(2)phase in A2 phase has better low field magnetostriction performance than the sample with A2 phase only,reaching 68×10^(–6)at 20 kA/m.

关 键 词：FE-GA合金 凝固速率 磁致伸缩性能 相结构 

分 类 号：O482.526[理学—固体物理]