Effects of cerium substitution on phase components, microstructures and magnetic properties of Nd-Fe-Ti-B alloy
来源期刊：Journal of Rare Earths2019年第8期
论文作者：Haijun Peng Yang Luo Yakun Dou Xinyuan Bai Wenlong Yan Dunbo Yu Yuanfei Yang
文章页码：861 - 864
摘 要：(Nd1-xCex)12Fe77Ti5B6（x = 0,0.2,0.3,0.4,0.6,0.8）alloys were prepared by melt-spinning and annealing techniques.The phase constitutions,microstructures and magnetic properties were investigated by powder X-ray diffraction（XRD）,a differential scanning calorimeter（DSC）,a vibrating sample magnetometer（VSM）and a transmission electron microscope（TEM）.It is found that with the increase of Ce content,the coercivity of the(Nd1-xCex)12Fe77Ti5B6 alloys reaches maximum first and then decreases.The maximum coercivity reaches 18.5 kOe obtained in the sample of 20% Ce substituted which is 34%higher than the Ce-free sample.TEM results reveal that the micro structure refinement effect is responsible for the coercivity improvement.This phenomenon implies that in some cases,Ce and Ti co-doping is more beneficial to improving of the coercivity than Ti single doping in Nd-Fe-B alloys.With further Ce addition,magnetic properties deteriorate due to the formation of CeFe2 and TbCu7-type phases.
Haijun Peng，Yang Luo，Yakun Dou，Xinyuan Bai，Wenlong Yan，Dunbo Yu，Yuanfei Yang
摘 要：(Nd1-xCex)12Fe77Ti5B6（x = 0,0.2,0.3,0.4,0.6,0.8）alloys were prepared by melt-spinning and annealing techniques.The phase constitutions,microstructures and magnetic properties were investigated by powder X-ray diffraction（XRD）,a differential scanning calorimeter（DSC）,a vibrating sample magnetometer（VSM）and a transmission electron microscope（TEM）.It is found that with the increase of Ce content,the coercivity of the(Nd1-xCex)12Fe77Ti5B6 alloys reaches maximum first and then decreases.The maximum coercivity reaches 18.5 kOe obtained in the sample of 20% Ce substituted which is 34%higher than the Ce-free sample.TEM results reveal that the micro structure refinement effect is responsible for the coercivity improvement.This phenomenon implies that in some cases,Ce and Ti co-doping is more beneficial to improving of the coercivity than Ti single doping in Nd-Fe-B alloys.With further Ce addition,magnetic properties deteriorate due to the formation of CeFe2 and TbCu7-type phases.
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