EET research on the Al-22%Si alloy under the action of electric pulses  

作　　者：WANG JianZhong HE LiJia LIN Cheng CANG DaQiang 

机构地区：[1]Liaoning University of Technology,Jinzhou 121001,China [2]Metallurgical and Ecological Engineering School,University of Science and Technology Beijing,Beijing 100083,China [3]School of Science,Northeastern University,Shenyang 110004,China

出　　处：《Science China(Technological Sciences)》2008年第11期1930-1938,共9页中国科学（技术科学英文版）

基　　金：the National Natural Science Foundation of China (Grant No. 50674054); the College Key Laboratory Open Fund of Liaoning Province(Grant No. 200516203)

摘　　要：Based on the empirical electron theory of solids and molecules (EET), the phase valence electron structure parameters of Al-22%Si alloy are calculated, and the sensitivity of the bond network of Al-Si alloy melt to temperature (energy) and the effect of the sensitivity on the morphology are studied. The results show that the Si-Si clusters with larger nA in the slightly superheated Al-Si alloy melt supply the nucleation core to the primary silicon phase in the hypereutectic Al-22%Si alloy, and strongly generate the drag-like effect for the Al-Si clusters around them; that the variation of temperature significantly affects the stability of bonds of the core so that the solidified structure is changed; that the electric pulse applied to the alloy melt can irrecoverably alter the stability of Si-Si clusters, then the modifica- tion of the solidified structure morphology of alloys is generated; that the higher the energy of the electric pulse, the less stable the Si-Si clusters, and the more significant the electric pulse modification.Based on the empirical electron theory of solids and molecules (EET), the phase valence electron structure parameters of Al-22%Si alloy are calculated, and the sensitivity of the bond network of Al-Si alloy melt to temperature (energy) and the effect of the sensitivity on the morphology are studied. The results show that the Si-Si clusters with larger n A in the slightly superheated Al-Si alloy melt supply the nucleation core to the primary silicon phase in the hypereutectic Al-22%Si alloy, and strongly generate the drag-like effect for the Al-Si clusters around them; that the variation of temperature significantly affects the stability of bonds of the core so that the solidified structure is changed; that the electric pulse applied to the alloy melt can irrecoverably alter the stability of Si-Si clusters, then the modification of the solidified structure morphology of alloys is generated; that the higher the energy of the electric pulse, the less stable the Si-Si clusters, and the more significant the electric pulse modification.

关 键 词：electric PULSE MODIFICATION EET PRIMARY silicon CLUSTER 

分 类 号：TG146.21[一般工业技术—材料科学与工程]