(1. 辽宁工业大学 材料科学与工程学院, 锦州 121001；2. 北京科技大学 冶金与生态工程学院, 北京 100083)
摘 要: 利用电磁学理论并结合电脉冲处理细化机制推算出凝固过程中结晶雨产生及激冷层形成时的脉冲电压临界值。对结晶雨出现时等效电流及其影响因素进行模型研究，分析电脉冲作用下合金凝固行为的特点，指出电脉冲处理组织细化时域应处于结晶雨产生与激冷层形成之间。此外，以该条件下Al-5%Cu合金的凝固组织特点对模型进行了验证。
关键字: Cu-Al合金；电脉冲处理；凝固组织；结晶雨；激冷层
Cu-Al alloy modified by electric pulse
（1. School of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, China;
2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing,
Beijing 100083, China）
Abstract:By using electromagnetism theory combined with the electric pulse modification mechanism, the two critical values of pulse voltage were calculated when the crystal rain and the chill layer were formed during solidification. The equivalent current and its influencing factors were model-based investigated and the solidification behavior was analyzed correspondingly. The model exhibits that the time domain of EPM-induced grain refinement is between the occurrence of crystal rain and the formation of chill layer. Furthermore, the proposed model is validated by the solidification structure changes of Al-5%Cu alloy under this circumstance.
Key words: Cu-Al alloy; electric pulse modification; solidification structure; crystal rain; chill layer
