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将含有大量富Cu颗粒的Cu-80%Pb(质量分数)过偏晶合金在强磁场作用下进行不同温度的保温实验,研究了富Cu颗粒在液固混合区的迁移行为.结果表明,无磁场作用时,富Cu颗粒在800℃以上出现迁移而上浮,900℃以上在试样顶部形成致密的富Cu分层,颗粒尺寸及迁移速率随温度升高而增加;富Cu颗粒在迁移过程中可通过热化长大或合并,其机制与富Cu液滴不同;富Cu颗粒群整体向上迁移,颗粒区与枝晶区有明显边界,颗粒间相互作用可使其迁移速率降低.强磁场具有降低颗粒迁移速度,抑制颗粒熟化及合并的作用,降低了富Cu颗粒的偏析程度,抑制致密富Cu分层的形成.考虑颗粒间相互作用,对有无磁场作用下颗粒所受的作用力和运动终端速度进行了分析和计算.
The migration experiments of Cu-80% Pb (mass fraction) over-crystallite alloy containing a large amount of Cu-rich particles under the action of strong magnetic field at different temperatures were carried out to study the migration behavior of Cu-rich particles in the liquid-solid mixing zone. When the magnetic field is applied, the Cu-rich particles migrate and float up above 800 ℃, dense Cu-rich delamination forms at the top of the sample above 900 ℃, and the grain size and migration rate increase with the increase of temperature. The mechanism of the Cu-rich droplets is different from that of the Cu-rich droplets. The Cu-rich particles migrate upwards and the boundaries between the grain boundaries and the dendrites are distinct. The interaction between the particles can decrease the migration rate. Reduce the migration speed of particles, inhibit the effect of grain ripening and combination, reduce the degree of segregation of Cu-rich particles and inhibit the formation of dense Cu-rich delamination. Considering the interaction between particles, Sports terminal speed was analyzed and calculated.