TRANSMISSION ELECTRON-MICROSCOPE CHARACTERIZATION OF CAST AND HOT-WORKED R-FE-B-CU(R=ND,PR) PERMANENT-MAGNETS
TRANSMISSION ELECTRON-MICROSCOPE CHARACTERIZATION OF CAST AND HOT-WORKED R-FE-B-CU(R=ND,PR) PERMANENT-MAGNETS
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DOI：
10.1063/1.349929
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发表时间：
1991-11-15
影响因子：
3.2
通讯作者：
BERNARDI, J
中科院分区：
文献类型：
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作者：
FIDLER, J;BERNARDI, J
在热加工的R-Fe-B永磁体中加入少量Cu（最多2 at），可改善其硬磁性能。%)。透射电镜分析表明，Cu主要溶解在硬磁性晶粒2:14:1的晶间区，导致矫顽力增大。在Nd-Fe-B:Cu和Pr-Fe-B:Cu磁体中得到的结果相似。晶间区由两相共晶组成：富Nd或富pr相和正交NdCu-或prcu -相。这对应于冷却过程中液体晶间相的共晶分解。结果表明，降低晶间相的熔化温度，有利于硬磁晶粒的润湿和分离，从而提高了矫顽力。
The hard magnetic properties of hot-worked R-Fe-B permanent magnets are improved by the addition of a minor amount of Cu (up to 2 at. %). Transmission electron microscope investigations show that the reason for the increase of the coercivity is the fact that Cu is mainly dissolved in the intergranular region separating the hard magnetic 2:14:1 grains. The results obtained are similar in Nd-Fe-B:Cu and Pr-Fe-B:Cu magnets. The intergranular region has been observed to consist of a eutectic consisting of two phases: the Nd- or Pr-rich phase and the orthorhombic NdCu- or PrCu-phase. This corresponds to the eutectic decomposition of the liquid intergranular phase during cooling. It is suggested that the decrease of the melting temperature of the intergranular phase leads to a better wetting behavior and separation of the hard magnetic grains, and therefore to an enhancement of the coercivity.