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In the paper, conductive atomic force microscopy (CAFM) technique was used, for the first time, to obtain direct evidence of oxide-film removal during fluxing, via measuring the electrical conductivity of aluminum sample surfaces. The CAFM results show that the F− ions from the flux loosened the film, forming micro cracks on the oxide film. Subsequently, the Zn2+ ions permeated into the film through...
The eutectic grain boundary diffusion process was applied to a 2-mm-thick hot-deformed Nd-Fe-B magnets using Nd62Dy20Al18 alloy as a diffusion source, realizing the coercivity enhancement from 0.91T to 2.75T with relatively small remanence deterioration from 1.50T to 1.30T. In contrast, the conventional grain boundary diffusion process using Dy-vapor resulted in the degradation of coercivity as the...
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