摘要
Considering the S L interface morphology stability, the S L interface energy, the Joule heat produced by electric current at the S L interface, and the change of solute concentration at the S L interface indirectly caused by electric current, the mechanism of reduction of columnar dendrite spacing in unidirectional solidification caused by electric current passing through solid liquid interface was studied. The following conclusions can be drawn that: 1) under sub rapid solidification condition, increasing electric current density will improve the stability of S L interface, thus decreasing the columnar dendrite spacing; 2)there are two ways by which the increase of electric current decreases the columnar dendrite spacing, one is promoting the splitting of the protruding tips at the S L interface, the other is promoting the forming of new convex parts at the bottom of the concave interface.[
Considering the SL interface morphology stability, the SL interface energy, the Joule heat produced by electric current at the SL interface, and the change of solute concentration at the SL interface indirectly caused by electric current, the mechanism of reduction of columnar dendrite spacing in unidirectional solidification caused by electric current passing through solid-liquid interface was studied. The following conclusions can be drawn that: 1) under sub-rapid solidification condition, increasing electric current density will improve the stability of SL interface, thus decreasing the columnar dendrite spacing; 2)there are two ways by which the increase of electric current decreases the columnar dendrite spacing, one is promoting the splitting of the protruding tips at the SL interface, the other is promoting the forming of new convex parts at the bottom of the concave interface.
出处
《中国有色金属学会会刊：英文版》
CSCD
2000年第5期610-613,共4页
Transactions of Nonferrous Metals Society of China
基金
Project (BJ96-0 2 -1 1 )supportedbytheMetallurgicalIndustryBureauofChina
