Abstract
The effect of Zr and Cu addition to a Nd 3.4 Dy 1 Fe 72.3 B 18.5 Cr 2.4 Co 2.4 alloy on the microstructure and the magnetic properties of Fe 3 B/Nd 2 Fe 14 B nanocomposite has been investigated by a three-dimensional atom probe (3DAP) and transmission electron microscopy (TEM). Addition of a small amount of Zr and/or Cu is effective in improving the hard magnetic properties of the base alloy. Cu atoms form clusters in the early stage of crystallization, and Zr atoms are segregated at the interfaces of Fe 3 B/Nd 2 Fe 14 B being rejected from the Fe 3 B soft magnetic phase on the optimal heat-treated condition. This causes refining the nanocomposite microstructure, resulting in improved hard magnetic properties compared to those of the base alloy.
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