中文摘要：

利用溶体快淬法研究了Y的添加对Pr_2Fe_（14）B合金磁性能的影响。结果表明：薄带Pr_2Fe_（14）B的最佳铜辊转速为30 m/s。Pr_（12-x）Y_xFe_（84）B_6（x=0~12）快淬薄带主要由各向异性、纳米结构的R_2Fe_（14）B相组成,其矫顽力、剩磁,剩磁比和饱和磁化强度均随着Y含量的增加而减少。Pr_（12-x）Y_xFe_（84）B_6快淬薄带的磁晶各向异性随着Y替代量的增加而降低,导致矫顽力逐渐减少,这是由于Y_2Fe_（14）B的磁晶各向异性低于Pr_2Fe_（14）B。然而,只要Y元素含量不超过4at%,Pr_（12-x）Y_xFe_（84）B_6快淬薄带的退磁化曲线的方形度较好,晶粒间交换耦合作用也比较强。

英文摘要：

The effect of Y addition on magnetic properties of Pr_2Fe_（14）B alloy was investigated by using melt-spinning method. The results show that the optimum copper roller speed for Pr_2Fe_（14）B melt-spun ribbon is 30 m/s. The melt-spun ribbons Pr_（12-x）Y_xFe_（84）B_6（ x = 0-12）mainly consist of R_2Fe_（14）B phase with anisotropy nanostructure. The coercivity,remanence and saturation magnetization all decrease with increasing of Y content. The reason for the decrease of coercivity may be that the magnetocrystalline anisotropy of Y_2Fe_（14）B is lower than that of Pr_2Fe_（14）B. However,the squareness of demagnetization curve of the melt-spun ribbons Pr_（12-x）Y_xFe_（84）B_6 remains good and the intergranular exchange coupling is stronger when the Y content is less than 4at% Y.