脉冲放电对Pb—Sn合金凝固组织影响的研究

The Modification of Solidified Structure of Ph-Sn Alloy by Pulse Electric Discharging

研究了两种脉冲放电（简称ＰＥＤ）方式下Ｐｂ－６０ｗｔ－％Ｓｎ合金的凝固组织，发现在大容量脉冲放电处理的条件下，富Ｐｂ初生相枝晶“破碎”，变成粒状晶；而在小容量高压连续脉冲放电处理的条件下，共晶晶粒沿电极方向拉长，共晶片沿电极方向生长，并且共晶片间距减小。最后，本文对脉冲放电影响金属凝固组织的机制进行了探讨。

The solidification structure of Ph-- 60wt%Sn alloy could be modified by two patterns of pulse electric discharging (PED). It is found that Ph--rich primary phase --dendritic is broken off into globular under PED with big capacitance,and under continuous PED with small capacitance and high voltage, the eutectic grains are pulled long along the electrods direction,the eutectic lamellars grow along the same direction and the lamellar spacing becomes small. Finally,the role played by PED on solidification structure has been discussed.