Abstract
The microalloying effect of Cu addition on the microstructure and magnetic properties of Fe3B/Nd2Fe14B nanocomposite permanent magnets has been investigated. With the optimum heat-treatment condition, Cu-containing alloy exhibits a much finer nanocomposite microstructure. Three-dimensional atom probe (3DAP) results have revealed that Cu and Nd form a high density (∼1024m-3) of Cu-Nd clusters containing 5.0 at.% Cu and 7.0 at.% Nd prior to the crystallization reaction of the Nd4.5Fe76.8B18.5Cu0.2 amorphous alloy. These clusters serve as heterogeneous nucleation sites for the Fe3B primary crystals. In the final Fe3B/Nd2Fe14B nanocomposite microstructure, Cu dissolves uniformly in the Nd2Fe14B hard magnetic phase. Improved magnetic properties have been obtained in the Cu-containing alloy; these are attributed to the reduction in the grain size due to the addition of Cu.
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