(Nd(1-x)Cex)(12)Fe(77)Ti5B6(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 diff...(Nd(1-x)Cex)(12)Fe(77)Ti5B6(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(Nd(1-x)Cex)(12)Fe(77)Ti5B6 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.展开更多
往 Fe C Si B激光熔覆专用合金粉末中加入 Ti粉 ,结果表明 ,加 Ti粉后熔覆层与基体润湿性非常好 ,并且裂纹倾向大大减少。控制 Ti的加入量 ,可以获得组织均匀的细化的过共晶、共晶和亚共晶熔覆层 ,整个熔覆层弥散、均匀分布着大量硬颗...往 Fe C Si B激光熔覆专用合金粉末中加入 Ti粉 ,结果表明 ,加 Ti粉后熔覆层与基体润湿性非常好 ,并且裂纹倾向大大减少。控制 Ti的加入量 ,可以获得组织均匀的细化的过共晶、共晶和亚共晶熔覆层 ,整个熔覆层弥散、均匀分布着大量硬颗粒 ,而硬颗粒的数量、尺寸及形状随 Ti元素加入量的不同而有所改变 ,熔覆层显微硬度分布也非常均匀。展开更多
基金Project supported by the National Key Research and Development Program of China(2016YFB0700902)
文摘(Nd(1-x)Cex)(12)Fe(77)Ti5B6(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(Nd(1-x)Cex)(12)Fe(77)Ti5B6 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.
