COERCIVITY AND ITS GRAIN SIZE DEPENDENCE IN CAST-HOT PRESSED Pr-Fe-B MAGNETS

Acta Metall Sin

1991, Vol. 27

Issue (5): 125-129 DOI:

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COERCIVITY AND ITS GRAIN SIZE DEPENDENCE IN CAST-HOT PRESSED Pr-Fe-B MAGNETS

CHEN Zhongmin;XIE Faqin;SHI Zhengxing;WANG Leyi;FU Hengzhi Northwestern Polytechnical University; Xi'an

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CHEN Zhongmin;XIE Faqin;SHI Zhengxing;WANG Leyi;FU Hengzhi Northwestern Polytechnical University; Xi'an. COERCIVITY AND ITS GRAIN SIZE DEPENDENCE IN CAST-HOT PRESSED Pr-Fe-B MAGNETS. Acta Metall Sin, 1991, 27(5): 125-129.

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Abstract Characteristics of magnetic hardening in cast-hot pressed magnetPr_(19)Fe_(74.5)B_5Cu_(1.5) were studied. The microstructure features and virgin magnetization curve reveal a nucleation controlled coercivity mechanism. Regression analysis shows that the intrinsic coercivity varies inversely as the logarithm of the average grain size: _iH_c(MA/m)=1.7312-0.4816lnd(μm) which confirms the randomness of nucleation of reversed domains and the statistical nature of coercivity, indicating that the decrease of grain size would reduce the average number of defects on its surface and lower the probability of magnetization reversal of a grain and the cumulative fraction of the grains that have reversed their magnetization. Coercivity is thus enhanced.

Key words: Pr-Fe-B magnet coercivity grain size nucleation cast-hot press

Received: 18 May 1991

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