In this work, Sm_24.6Co₅₀Fe_17·4Cu_5·7Zr_2.3-xHf_x (x = 0–2.0) ribbons and magnets were prepared by melt-spinning method and spark plasma sintering (SPS) technique. The magnetic properties of the melt-spun ribbons with Hf addition are much higher than those of the Hf-free ribbons in the temperature range of 300–400 K. The optimal comprehensive magnetic properties of ribbons and isotropic magnets were obtained with 1.0 wt% Hf substitution. Microstructural results showed that Hf elements do not enter into the hard magnetic 1:7H and 2:17R phase in SPSed magnets and Zr–Hf rich phases are formed around grain boundaries as particulates. The enhancement of magnetic properties of the ribbons and SPSed magnets can be attributed to grain refinement and more uniform microstructure as a result of Hf addition. The micro-twin structure of 2:17R phase also have been discovered in the spark plasma sintered magnets. This work may provide a rapid preparation of Sm₂Co₁₇ magnets.

在这项工作中，Sm _24.6 Co ₅₀ Fe _17·4 Cu _5·7 Zr _{2.3- x} Hf _x（x = 0–2.0）通过熔融纺丝法和火花等离子体烧结（SPS）技术制备了带和磁体。在300–400 K的温度范围内，添加Hf的熔纺薄带的磁性能比不含Hf的薄带高得多。在1.0 wt％的Hf下，可以获得最佳的综合磁性能和各向同性磁体替代。显微组织结果表明，Hf元素不会进入SPSed磁体中的硬磁1：7H和2：17R相，并且富集Zr–Hf的相以颗粒形式形成在晶界周围。带钢和SPSed磁体的磁性能增强可以归因于Hf添加导致晶粒细化和更均匀的微观结构。在火花等离子体烧结磁体中还发现了2：17R相的微孪晶结构。_2个Co ₁₇磁铁。