%0 Journal Article
%T Numerical simulation of columnar to equiaxial transition during solidification of Ti-44at%Al alloy<br>Ti-44at%Al合金小尺寸铸件柱状晶/等轴晶演化过程模拟
%A Wang Kuang-Fei
%A Li Bang-Sheng
%A Ren Ming-Xing
%A Mi Guo-F
%A Guo Jing-Jie
%A Fu Heng-Zhi
%A <br>王狂飞
%A 李邦盛
%A 任明星
%A 米国发
%A 郭景杰
%A 傅恒志
%J 物理学报
%D 2007
%I 
%X Solute diffusion controlled solidification model was employed to simulate the columnar to equiaxial transition (CET) of TiAl alloy casting. The simulation results show that solute shock wave occurs when the diffusion fields of columnar and equiaxial dendrites meet. It could be one of the main factors blocking the columnar dendrite growth. Using this model, the CET in small castings was qualitatively predicted. It was found that the thermal gradient and solute undercooling ahead of the columnar tips of CET act jointly on CET, being in good agreement with experimental observations.
%K TiAl alloys
%K solute shock wave
%K columnar to equiaxial transition<br>TiAl合金
%K 成分冲击波
%K 柱状晶/等轴晶转变
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=C949DBDA5D90868B&yid=A732AF04DDA03BB3&vid=014B591DF029732F&iid=B31275AF3241DB2D&sid=C44B7A9AE1645FAD&eid=3AFE3BA975BB1EEB&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=16