Stability of solid/liquid interface of Pb-80wt%Sn alloy under direct current during directional solidification
The effect of medium-density current on the morphological stability of S/L interface of Pb-80wt%Sn alloy during directional solidification was investigated.The results indicated that both the DC of positive and negative 200 Acm2 could decrease the critical growth rate of cellular/dendrite transition and minish the range of growth rate of cellular crystal.DC accelerated the microstructure transition from cellular crystal to dendrite crystal at the same pulling rate.Furthermore,the dendrite crystal was refined by positive and negative DC at high pulling rate.The effect of direction of DC to the microstructure transition could be neglected.In conclusion,the positive and negative 200 Acm-2 decreased the stability of solid/liquid interface of Pb-80%Sn alloy,and the lower the pulling rate was applied,the more obviously DC affected the microstructure.
stability of solid/liquid interface direct current directional solidification
Ning Li Rong Zhang Limin Zhang Lifei DU Qian Liu
School of Science,Northwestern Polytechnical University,Key Laboratary of Space Applied Physics and China Academy of Space Technology(Xian),Xian,710000,P.R.China
国际会议
济南
英文
245-248
2012-12-29（万方平台首次上网日期，不代表论文的发表时间）