The microstructure of sintered Sm (Co0.72Fe0.20Cu0.055Zr0.025) (7.5) permanent magnet studied by atom probe
作者： X.Y Xiong , T Ohkubo , T Koyama , K Ohashi , Y Tawara
DOI: 10.1016/J.ACTAMAT.2003.10.015
关键词: Coercivity 、 Transmission electron microscopy 、 High-resolution transmission electron microscopy 、 Phase (matter) 、 Materials science 、 Analytical chemistry 、 Crystallography 、 Electron diffraction 、 Microstructure 、 Atom probe 、 Magnet
摘要: Abstract The microstructure and the compositions of constituent phases in a sintered Sm(Co0.72Fe0.20Cu0.055Zr0.025)7.5 permanent magnet with different cooling processes have been investigated by transmission electron microscopy three-dimensional atom probe (3DAP) technique. Cu concentration SmCo5 phase increases during slow from 820 to 520 °C, having wider profile than that Sm at cell boundaries. Enrichment triple junction boundaries was also found. These results explain substantial increase coercivity process. High resolution nano-beam diffraction analysis confirmed Z-phase is Zr(Co, Fe)3, Be3Nb structure a≈0.5 nm, c≈2.4 nm. In Z-phase, almost completely replaced Zr cooling.
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