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We investigated the mechanisms of coercive force enhancement on Nd11Dy4Fe76.5TM2.5B6 (TM = Co, Cu, Al) induced by a number of cyclic heat treatments (CHT) at temperatures from 350°C to 450°C. The difference in thermal expansion coefficients between Nd-rich and Nd2Fe14B phases induced penetration of the Nd-rich phase into the Nd2Fe14B grain boundary through capillary force and compress pressure by...
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