Abstract
Microstructure, composition and magnetic property correlations have been attempted for directionally solidified dilute Bi-Mn alloys. The ingots exhibited predominantly acicular BiMn precipitate particles in a bismuth matrix, and showed magnetic anisotropy along the direction of solidification. The saturation magnetization has been found to increase linearly with the weight percentage of manganese over the entire composition range investigated, starting from the hypoeutectic (0.15% Mn) to the hypereutectic (6.6% Mn) region. The intrinsic coercivity has been observed to be a maximum along the direction of solidification, but it decreased with manganese content in both the as-cast and the directionally solidified alloys. The results are discussed in terms of the crystal anisotropy, shape anisotropy and packing factor of the magnetic particles.
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