%0 Journal Article
%T MICRO-/MACRO-SCOPIC MODELING OF SOLUTAL MASS TRANSPORT IN DENDRITE SOLIDIFICAfION WITH PARTIAL SOLID BACK DIFFUSION<br>任意固相反扩散条件下枝晶凝固溶质传输微观／宏观模型化
%A XU Daming
%A ZHANG Chengjun
%A SI Guangju
%A <br>徐达鸣
%A 张成军
%A 司广琚
%J 金属学报
%D 1998
%I 
%X The continuum model proposed by the present authors for macroscopic solidification transport phenomena and macrosegregation formation was extended to account for the effect of any incomplete solid back diffusion through a microscopic dendrite solidification model. A generalized coefficient for the solid back diffusion was proposed by the present microscopic/macroscopic model, which includes the growing dendrite dimension, the parameters for the dendrite geometry, the solidification rate and partition coefficient etc besides the solid diffusivity.Numerical simulation of macrosegregations in a horizontal directionally soliditied A1-4.4Cu ingot with assumed different solid diffusivities of the copper solute was performed using the extended continuum model. The computation results show that the variation of the solid back diffusion can evidently influence the macrocomposition distribution in the soliditied ingot, and the greater the solid solute diffusivity, the lighter the macrosegregation seventy.
%K dendrite solidification
%K solid back diffusion
%K macrosegregation
%K mathematical model
%K A1-Cu alloy<br>枝晶凝固
%K 固相反扩散
%K 宏观偏析
%K 数学模型
%K 铝合金
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=ECDC9ECCF881A3E344E960DFDAAC172A&yid=8CAA3A429E3EA654&vid=339D79302DF62549&iid=DF92D298D3FF1E6E&sid=DA280A426E11FC95&eid=2A22E972FD97071B&journal_id=0412-1961&journal_name=金属学报&referenced_num=3&reference_num=10