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利用熔体快淬法制备了(Nd Pr)6Fe79B15和(Nd Pr,Dy)6Fe74.5Co3Cu0.5Zr1B15非晶带。通过X射线衍射(XRD)和差热分析(DSC),并借助Kempen模型和Kissinger方程,研究了合金的非晶晶化过程及非等温晶化动力学。结果表明,与(Nd Pr)6Fe79B15合金相比,(Nd Pr,Dy)6Fe74.5Co3Cu0.5Zr1B15合金的非晶形成能力明显提高,在9 m/s的辊速下获得了厚度为100μm以上的非晶厚带。2种合金的非晶厚带具有不同的晶化过程及晶化动力学机制。(Nd Pr)6Fe79B15合金的晶化分4步完成:非晶相(A)→Nd2Fe23B3+A’→α-Fe+Fe3B+Nd2Fe23B3’→α-Fe+Fe3B+Nd2Fe14B→α-Fe+Fe3B+Nd2Fe14B+Nd1Fe4B4;而(Nd Pr,Dy)6Fe74.5Co3-Cu0.5Zr1B15合金的晶化分两步完成:非晶相(A)→Fe3B+A’→α-Fe+Fe3B+Nd2Fe14B。与(Nd Pr)6Fe79B15合金由界面控制的多晶型晶化不同,(Nd Pr,Dy)6Fe74.5Co3Cu0.5Zr1B15合金第1步为界面控制的多晶型晶化,第2步则以扩散控制的共晶型晶化为主。由于退火后组织结构的细化和改善,(Nd Pr,Dy)6Fe74.5Co3Cu0.5Zr1B15合金带的磁性能明显优于(Nd Pr)6Fe79B15合金带。
(Nd Pr) 6Fe79B15 and (Nd Pr, Dy) 6Fe74.5Co3Cu0.5Zr1B15 amorphous ribbons were prepared by melt quenching method. The amorphous crystallization process and non-isothermal crystallization kinetics were studied by X-ray diffraction (XRD) and differential thermal analysis (DSC) with Kempen model and Kissinger equation. The results show that compared with (Nd Pr) 6Fe79B15 alloy, the (Nd Pr, Dy) 6Fe74.5Co3Cu0.5Zr1B15 alloy has an obvious increase in the amorphous formation ability. Under the rolling speed of 9 m / s, Crystal thick belt. The amorphous thick bands of the two alloys have different crystallization processes and crystallization kinetics. (Nd Pr) 6Fe79B15 alloy is completed in four steps: amorphous phase (A) → Nd2Fe23B3 + A ’→ α-Fe + Fe3B + Nd2Fe23B3’ → α-Fe + Fe3B + Nd2Fe14B → α-Fe + Fe3B + Nd2Fe14B + Nd1Fe4B4; and the (Nd Pr, Dy) 6Fe74.5Co3-Cu0.5Zr1B15 alloy is crystallized in two steps: amorphous phase (A) → Fe3B + A ’→ α-Fe + Fe3B + Nd2Fe14B. Unlike (Nd Pr) 6Fe79B15 alloy controlled by the interface polymorphism, the first step of (Nd Pr, Dy) 6Fe74.5Co3Cu0.5Zr1B15 alloy is interfacial controlled polymorphic crystallization. The second step is controlled by diffusion control Of the eutectic crystallization based. The magnetic properties of (Nd Pr, Dy) 6Fe74.5Co3Cu0.5Zr1B15 alloy ribbons are better than that of (Nd Pr) 6Fe79B15 alloy ribbons due to the refinement and improvement of microstructure after annealing.