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金属学报  2013 

稀土Ce添加对Fe83Ga17合金微结构和磁致伸缩性能的影响

DOI: 10.3724/SP.J.1037.2012.00498, PP. 87-91

Keywords: Fe-Ga合金')",&searchField=keyword">href="#">,Fe-Ga合金,磁致伸缩,稀土Ce添加,微结构

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Abstract:

为了改善Fe-Ga合金的磁致伸缩性能,采用真空非自耗电弧炉制备了Fe83Ga17Cex(x=0.0,0.2,0.4,0.6,0.8,1.0)合金,用X射线衍射仪(XRD)和扫描电镜及能谱仪(SEM/EDS)分析了合金的微结构,用电阻应变法测量了合金的磁致伸缩性能.结果表明Fe83Ga17合金由单一的bcc结构A2相组成.而添加稀土Ce后,除x=0.2合金外,Fe83Ga17Cex合金主要由bcc结构的A2相和CeFe2第二相组成.此外,Fe83Ga17合金的微观组织是晶粒粗大的等轴晶,而Fe83Ga17Ce0.8合金的微观组织是晶粒细小的柱状晶.与Fe83Ga17对照合金相比,除x=0.2合金的磁致伸缩系数略小于对照合金外,其他添加稀土Ce后的合金样品磁致伸缩系数均明显增加.添加稀土Ce后,Fe83Ga17Cex合金的磁致伸缩系数随稀土Ce含量的增加呈现出先增加后减小的变化趋势,x=0.8合金的磁致伸缩系数最大,在557kA/m外加磁场下,磁致伸缩系数达到356×10-6.

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