HOT DEFORMATION OF CAST Pr-Fe-B MAGNETS

Acta Metall Sin

1992, Vol. 28

Issue (3): 75-80 DOI:

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HOT DEFORMATION OF CAST Pr-Fe-B MAGNETS

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

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CHEN Zhongmin;SHI Zhengxing;WANG Leyi;FU Hengzhi Northwestern Polytechnical University; Xi'an. HOT DEFORMATION OF CAST Pr-Fe-B MAGNETS. Acta Metall Sin, 1992, 28(3): 75-80.

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Abstract Whatever the cast Pr_(19)Fe_(74.5)B_5Cu_(1.5) magnet deforms in various processes, itseasy-axes are aligned parallel to the compressive strain direction. During hot deformation, thecrushing of Pr_2Fe_(14)B matrix grains, the relative slip and rotation between the grains and thesqueezing out of Pr--rich melt of the magnet take place. Then a fine, dense and well--alignedmicrostructure may be formed in the fully deformed magnets with improved properties, B_r=990mT, _iH_c=880 kA / m and (BH)m=191 kJ / m~3. The increase of coercivity is attributed to thefine Pr_2Fe_(14)B grains and the thin Pr--rich phase layer continuously distributed at the grainbounbaries. The increasing remanence is resulted primarily from the development of theeasy--axis alignment as well as from the densification of the Pr_2Fe_(14)B matrix. The easy--axisalignment is developed by the relative slip and rotation of the crushed Pr_2Fe_(14)B grains. A fulland slow hot deformation is necessary for a good easy--axis alignment and high magnetic prop-erties.

Key words: Pr-Fe-B magnet hot deformation microstructure magnetic property

Received: 18 March 1992

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1992/V28/I3/75

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