Vertical sections of Tb_0.15Ho_0.85Fe_y-Tb_0.3Dy_0.7Fe_y (y=1.85, 1.9, 2.0) in Tb-Dy-Ho-Fe system

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• 作者：Bowen WANG ((王博文)) ; ^{bwwang@hebut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Wenmei HUANG ((黄文美)) ; Ling WENG ((翁 玲)) ; Ying SUN ((孙 英)) ; Shuying CAO ((曹淑瑛)) ; Zhihua Wang ((王志华))
• 关键词：Tb-Dy-Ho-Fe system ; phase relationship ; vertical section ; microstructure ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：33
• 期：11
• 页码：1170-1174
• 全文大小：970 K

文摘

The x(Tb_0.15Ho_0.85Fe_y)+(1–x)(Tb_0.3Dy_0.7Fe_y) (x=0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9; y=1.85, 1.9, 2.0) samples were prepared by a vacuum arc furnace, and annealed at 1000 °C for 1 d and at 950 °C for a week. Three vertical sections of Tb_0.15Ho_0.85Fe_y-Tb_0.3Dy_0.7Fe_y (y=1.85, 1.9, 2.0) in the Tb-Dy-Ho-Fe system were determined using optical microscopy, scanning electron microscopy, energy dispersion X-ray spectroscopy, X-ray diffraction, and differential thermal analysis. These vertical sections consisted of two single-phase regions: L and (Tb,Dy,Ho)Fe₂; four two-phase regions: L+(Tb,Dy,Ho)Fe₃, L+(Tb,Dy,Ho)Fe₂, (Tb,Dy,Ho)Fe₂+(Tb,Dy,Ho)Fe₃, and (Tb,Dy,Ho)Fe₂+(Tb,Dy,Ho). The high Ho content of (Tb,Dy,Ho)Fe_y alloys led to the elevation of the peritectic temperature of L+(Tb,Dy,Ho)Fe₃→(Tb,Dy,Ho)Fe₂. The region of (Tb,Dy,Ho)Fe₂ phase was shifted towards the side of rich-Ho with the Fe content increasing. It meant that the substitution of Ho for Dy or Tb had a marked effect on the solidification process of (Tb,Dy,Ho)Fe₂ compounds.