Atomic Mobilities in Liquid and fcc Nd-Fe-B Systems and Their Application in the Design of Quenching Nd2Fe14B Alloys
Atomic Mobilities in Liquid and fcc Nd-Fe-B Systems and Their Application in the Design of Quenching Nd2Fe14B Alloys
复制标题
液体和面心立方 Nd-Fe-B 体系中的原子迁移率及其在淬火 Nd2Fe14B 合金设计中的应用
DOI：
10.1007/s11661-021-06288-4
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发表时间：
2021-05
影响因子：
2.8
通讯作者：
Rao Guanghui
中科院分区：
文献类型：
--
作者：
Li Xiaoming;Yao Qingrong;Lu Zhao;Ma Lei;Du Yusong;Wang Jiang;Zhou Huaiying;Rao Guanghui
利用已发表的和目前计算的扩散系数，用扩散控制的反变换软件建立了Nd-Fe-B系液相和面心立方相的原子迁移率的可靠和自洽的描述。基于所得到的Nd-Fe-B系原子迁移率耦合热力学描述，建立了Nd 2Fe 14 B合金的轮速凝固图，考察了轮速对快淬Nd 2Fe 14 B合金凝固行为的影响。根据理论获得的凝固组织及其与磁性能的关系，确定了快淬Nd 2Fe 14 B薄带快淬时的最佳轮速为35 m/s。实验的显微组织特征和磁滞回线的测量证实，在35 m/s的轮速制备的薄带具有最好的综合磁性能，因为剩余的bcc-Fe相被显着抑制和主Nd 2Fe 14 B相被很好地细化到超细晶显微组织。并对薄带中主相的晶粒细化机制进行了描述。
Using published and presently calculated diffusivities, a reliable and self-consistent atomic mobility description of the liquid and fcc phases in a Nd-Fe-B system is established by DIffusion-Controlled TRAnsformation software. Based on the obtained atomic mobility-coupled thermodynamic descriptions of the Nd-Fe-B system, a wheel speed-dependent solidification diagram for a model Nd2Fe14B alloy is constructed, which allows us to examine the influence of wheel speed on the solidification behavior of the quenching Nd2Fe14B alloy. According to the theoretically obtained solidified microstructures and their relationship with the magnetic properties, the optimal wheel speed when melt-spinning the quenching Nd2Fe14B ribbons is determined to be 35 m/s. The experimental microstructural characterizations and magnetic hysteresis loop measurements confirm that the ribbon prepared at a wheel speed of 35 m/s exhibits the best comprehensive magnetic properties because the remaining bcc-Fe phase is significantly suppressed and the main Nd2Fe14B phase was well refined to an ultrafine-grained microstructure. The grain refinement mechanism of the main phase in the ribbons is also described.Graphic Abstract
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影响因子：
2.4
作者：
P. Ekins
通讯作者：
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影响因子：
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作者：
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影响因子：
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作者：
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