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Effect of Cu On Microstructural Evolution of Nanocrystalline Soft and Hard Magnetic Materials

Published online by Cambridge University Press:  21 February 2011

K. Hono ,
D. H. Ping  and
S. Hirosawa
K. Hono
Affiliation:
National Research Institute for Metals, 1-2-1 Sengen, Tsukuba 305-0047, Japan
D. H. Ping
Affiliation:
National Research Institute for Metals, 1-2-1 Sengen, Tsukuba 305-0047, Japan
S. Hirosawa
Affiliation:
Sumitomo Special Metals Co., Ltd., 2-15-17 Egawa, Osaka 618-0013, Japan
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Abstract

The nanocrystallization processes in Fe-Si-B-Nb-Cu and Fe-Nd-B(-Cu-Nb) amorphous alloys have been studied by transmission electron microscopy (TEM) and a three dimensional atom probe (3DAP). Cu additions are effective in refining the nanocrystalline microstructures of both alloys, because Cu atom clusters formed prior to the crystallization reaction serve as heterogeneous nucleation sites for the primary crystals. However, the clustering behaviors of Cu atoms in these two alloy systems are different, i.e., Cu completely dissolves in the Nd2Fe1 4B phase in the final microstructure of the Nd4.5Fe75.8B18.5Cu0.2Nb1 alloy, whereas CL' clusters grow to fcc-Cu particles in the Fe73.5Si13.5B9Nb3Cu1 alloy. The nanocrystallization processes in these two alloys clarified by the 3DAP results are compared.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 577: Symposium H – Advanced Hard and Soft Magnetic Materials , 1999 , 507
Copyright
Copyright © Materials Research Society 1999

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