研究了强磁场对Cu-90%Pb合金中比重偏析的影响规律.结果表明:10T磁场下,当冷却速度达到100℃/min以上时,Cu-90%Pb合金中的重力偏析得到完全抑制;随着磁感应强度的增加,磁场对比重偏析的抑制作用增强.在30℃/min冷却速度下,12T磁场使该种合金凝固中的50微米直径颗粒上浮速度下降90%以上.理论分析表明:强磁场增加金属熔体粘度,降低自然对流,诱生洛伦兹力阻力来抑制颗粒上浮和聚合.
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