(1. 遼寧工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院, 錦州 121001；2. 北京科技大學(xué) 冶金與生態(tài)工程學(xué)院, 北京 100083)
摘 要: 利用電磁學(xué)理論并結(jié)合電脈沖處理細化機制推算出凝固過程中結(jié)晶雨產(chǎn)生及激冷層形成時的脈沖電壓臨界值。對結(jié)晶雨出現(xiàn)時等效電流及其影響因素進行模型研究，分析電脈沖作用下合金凝固行為的特點，指出電脈沖處理組織細化時域應(yīng)處于結(jié)晶雨產(chǎn)生與激冷層形成之間。此外，以該條件下Al-5%Cu合金的凝固組織特點對模型進行了驗證。
關(guān)鍵字: Cu-Al合金；電脈沖處理；凝固組織；結(jié)晶雨；激冷層
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
