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Using conventional N2 gas jet milling, a coercivity of 19.01 kOe was obtained in Dy-free sintered Nd–Fe–B magnets with the grain size refined to 2.6 $\mu$ m. Through the high-frequency induction heat treatment (HIHT) at 600°, the coercivity was enhanced to 20.56 kOe, while the remanence remained unchanged. The transmission electron microscope observation showed that the grain boundaries were broadened...
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