Title :
Atom probe characterization of an α-Fe/Nd2Fe14B nanocomposite magnet with a remaining amorphous phase
Author :
Wu, Y.Q. ; Ping, D.H. ; Hono, K. ; Inoue, A.
Author_Institution :
Nat. Res. Inst. for Metals, Tsukuba, Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
The microstructural features of Nd8Fe76.5Co 8B6Cu0.5Nb1 nanocomposite magnet have been studied by a three-dimensional atom probe (3DAP) and transmission electron microscopy (TEM). The as-melt-spun microstructure is composed of α-Fe, Nd2Fe14B and a large fraction of intergranular amorphous phase. The annealed microstructure with optimum magnetic properties contains the same constituent phases as those in the as-quenched state, but the volume fraction of the Nd2 Fe14B grains is increased by partial crystallization of the remaining amorphous phase. Nb and B are found to be enriched in the remaining amorphous phase. Unlike Fe3B/Nd2Fe14B nanocomposite, Cu additions are not effective in refining the grain size in this system
Keywords :
amorphous magnetic materials; atom probe field ion microscopy; boron alloys; cobalt alloys; copper alloys; crystal microstructure; ferromagnetic materials; grain size; iron alloys; nanostructured materials; neodymium alloys; niobium alloys; permanent magnets; transmission electron microscopy; α-Fe/Nd2Fe14B nanocomposite magnet; Nd8Fe76.5Co8B6Cu 0.5Nb1; amorphous phase; as-melt-spun microstructure; atom probe characterization; intergranular amorphous phase; partial crystallization; transmission electron microscopy; volume fraction; Amorphous magnetic materials; Amorphous materials; Annealing; Iron; Magnetic force microscopy; Microstructure; Neodymium; Niobium; Probes; Transmission electron microscopy;
Journal_Title :
Magnetics, IEEE Transactions on
