Abstract
Abstract Multi-main-phase (MM0.3Nd0.7)-Fe-B (MM = Misch Metal) magnets were prepared by sintering the mixture of Nd-Fe-B and MM-Fe-B powders. In order to further enhance the coercivity of the magnet, Nd8Cu2 eutectic alloy powders were added to the magnets as a variable. When the addition of the Nd8Cu2 powders increases from 0 to 5 wt%, the Hcj of the magnets increases by 56.8% (7.01–10.99 kOe). Microstructural investigations show that after the addition of 5 wt% Nd8Cu2 powders, the thickness of continuous grain boundary layers are over 2.1 nm, which effectively block the short-range exchange coupling between adjacent grains, contributing to the improvement of Hcj. The Selected Area Electron Diffraction images show that the Cu exists in the form of NdCu2 in the grain boundary layers.
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