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中文摘要：
在1g的重力加速度条件下,研究熔体对流对向上生长的定向凝固Pb-33%Sn合金枝晶生长行为的影响。熔体对流由行波磁场进行调制。当行波磁场方向由向上转变为向下时,一次枝晶间距逐渐增大,一次枝晶间距的分布更加紧凑,且峰值趋于降低。分析表明：行波磁场对熔体对流的调制作用与改变重力加速度的效果类似,当抽拉速率为50μm/s,行波磁场强度为1mT时,在向上和向下的行波磁场作用下有效重力加速度分别为3.07g和0.22g。
英文摘要：
The influence of melt convection on dendrite growth during the upward-directional solidification of Pb-33%Sn binary alloys was investigated.The melt convection was modulated by traveling magnetic field.When the direction of traveling magnetic field was changed from upward to downward,the primary dendrite spacing gradually increased,and the distribution peak of the primary dendrite spacing shifted to the field of narrower spacing.These result from the different intensities of melt convection,which are controlled by the traveling magnetic field.The effects of the traveling magnetic field on melt convection are similar to those of adjustment in the gravity level,thus,the primary dendrite spacing varies.When the intensity of the traveling magnetic field was 1 mT,and the drawing speed was 50 μm/s,the gravity acceleration reached 0.22g for the downward-traveling magnetic field and 3.07g for the upward-traveling magnetic field.
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