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Textured structures of MnBi precipitated phase in Bi--Mn alloys solidified in a magnetic field |
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中国科学院电工研究所 |
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Cite this article:
;. Textured structures of MnBi precipitated phase in Bi--Mn alloys solidified in a magnetic field. Chin J Mater Res, 2004, 18(5): 499-505.
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Abstract Magnetic textured structures of MnBi precipitated phase in Bi--6\% Mn alloy
were studied experimentally during solidification of the alloy from the semi
solid zone below 446℃. An abrupt shape change of MnBi phase from regular hexagonal
grains to oblate grains grown up along their ab--plane was observed firstly near
340℃, which is the transformation temperature of MnBi compound from paramagnetic
state to ferromagnetic state. After the production of ferromagnetic MnBi
grains from the magnetic transformation, the textured structures form by
the rotation of the precipitated grains. The critical magnetic flux intensity for
the textured structures decreases with increasing the heating temperature during
solidification from the semi solid zone below 355℃ and increases between 355℃ and
446℃. Solidification from the semi solid zone below 355℃ is propitious to fabricate
hypereutectic Bi/MnBi magnetic composites with excellent properties.
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Received: 05 November 2004
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