Multielement alloy doping is the feature of this paper, and disclosing the relationship between non-equilibrium microstructure and magnetic properties after rapid cooling is the key point. 3 wt% eutectic Al_82.8Cu₁₇Fe_0.2 alloy was doped into SmCo₅ alloy, followed by melt-spinning at 10–40 m/s. It is found all ribbons are composed of Sm(Co, M)₅ and Sm₂(Co, M)₇ phases, but non-equilibrium solidification at different cooling rates results in different distribution characteristics of phases and magnetic properties of the ribbons. The 10 m/s ribbons are composed of Sm–Cu- and Co-rich Sm(Co, M)₅ phases and then the lamellate Sm₂(Co, M)₇ coexists with CeCo₅-type Sm(Co, M)₅ grains in the 25 m/s ribbons, while the 40 m/s ribbons form a cellular microstructure with Sm₂(Co, M)₇ grain boundaries and Sm(Co, M)₅ intracellular grains. Correspondingly, the coercivity, remanence, and maximum magnetization of 40 m/s ribbons are 74.3%, 64.3%, and 53.2% higher than those of 10 m/s ribbons. At the same time, the coercivity mechanism and microstructure evolution are discussed.

多元素合金掺杂是本文的特点，揭示快速冷却后非平衡组织与磁性能之间的关系是关键。将3 wt％的低共熔Al _82.8 Cu ₁₇ Fe _0.2合金掺杂到SmCo ₅合金中，然后以10-40 m / s的速度进行熔融纺丝。发现所有带均由Sm（Co，M）₅和Sm ₂（Co，M）₇相组成，但是在不同冷却速率下的非平衡凝固导致带的相分布和磁性能不同。10 m / s的碳带由富Sm-Cu和富Co的Sm（Co，M）₅相组成，然后是薄片状Sm。在25 m / s的色带中₂（Co，M）₇与CeCo ₅型Sm（Co，M）₅颗粒共存，而40 m / s的色带与Sm ₂（Co，M）_7的晶粒形成细胞微结构。边界和Sm（Co，M）_5个胞内颗粒。相应地，40 m / s碳带的矫顽力，剩磁和最大磁化强度分别比10 m / s碳带高74.3％，64.3％和53.2％。同时讨论了矫顽力机理和微观组织演变。