Observation of Pseudopartial Grain Boundary Wetting in the NdFeB-Based Alloy
Observation of Pseudopartial Grain Boundary Wetting in the NdFeB-Based Alloy
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DOI：
10.1007/s11665-015-1872-8
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发表时间：
2016-03
影响因子：
2.3
通讯作者：
B. Straumal;B. Straumal;A. Mazilkin;S. Protasova;S. Protasova;Gisela Schütz;A. Straumal;A. Straumal;B. Baretzky
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文献类型：
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作者：
B. Straumal;B. Straumal;A. Mazilkin;S. Protasova;S. Protasova;Gisela Schütz;A. Straumal;A. Straumal;B. Baretzky
NdFeB 基合金于 20 世纪 80 年代发明，至今仍是最著名的硬磁合金。为了达到最佳的磁性能，硬磁 Nd2Fe14B 相的晶粒必须通过非铁磁富 Nd 相（可能很薄）层彼此隔离。在这项工作中，我们观察到由于准部分晶界（GB）润湿，Nd2Fe14B 晶粒之间出现了几个纳米薄层的富 Nd 相。也就是说，一些Nd2Fe14B/Nd2Fe14B晶界没有被富Nd熔体完全润湿，并且与液相具有高接触角，但仍含有2-4nm薄的均匀富Nd层。
The NdFeB-based alloys were invented in 1980s and remain the best-known hard magnetic alloys. In order to reach the optimum magnetic properties, the grains of hard magnetic Nd2Fe14B phase have to be isolated from one another by the (possibly thin) layers of a non-ferromagnetic Nd-rich phase. In this work, we observe that the few-nanometer-thin layers of the Nd-rich phase appear between Nd2Fe14B grains due to the pseudopartial grain boundary (GB) wetting. Namely, some Nd2Fe14B/Nd2Fe14B GBs are not completely wetted by the Nd-rich melt and have the high contact angle with the liquid phase and, nevertheless, contain the 2-4-nm-thin uniform Nd-rich layer.