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本文报道了对共晶Bi/MnBi磁性材料凝固特性的研究结果。讨论了生长速度R、温度梯度G_L对纤维间距λ和剩余磁感应强度B_r的影响。结果表明,当R>2cm/h时,λ~2R=常数;温度梯度G_L对λ无明显影响;Bi/MnBi的B_r值随R的增大而下降,随G_L的增大而提高,显示出凝固特性与磁学性能间的密切关系。

Eutectic Bi / MnBi magnetic alloy was prepared by directional solidification.When the growth rate, R>2 cm / h, the MnBi fibre spacing, λ, distributed homogeneously inBi matrix, follows λ~2R=constant. The thermal gradient, G_L, does not influence λ. The mag-netic property, B_r of Bi / MnBi alloy decreases with the increase of R and increases with theincrease of G_L

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