A steady solution of the gasar eutectic growth in directional solidification  

作　　者：李向明 李文琼 金青林 周荣 

机构地区：[1]School of Materials Science and Engineering,Kunming University of Science and Technology

出　　处：《Chinese Physics B》2013年第7期547-554,共8页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.51201078,51164018,and u0837603)

摘　　要：This paper presents the general mathematical model on gasar eutectic growth in directional solidification. Using multiple scale expansion and matching method, we obtain the global steady solution of gasar eutectic growth as the Peclet number ε≤1, where ε is defined as the ratio of half an inter-pore spacing and solutal diffusion length. We also give the interfacial shape and predict the porosity of gasar eutectic growth. Results show that porosity is mainly dependent on gas pressure above the metal melt, but independent of pulling velocity. Our predicted results are in agreement with experimental data.This paper presents the general mathematical model on gasar eutectic growth in directional solidification. Using multiple scale expansion and matching method, we obtain the global steady solution of gasar eutectic growth as the Peclet number ε≤1, where ε is defined as the ratio of half an inter-pore spacing and solutal diffusion length. We also give the interfacial shape and predict the porosity of gasar eutectic growth. Results show that porosity is mainly dependent on gas pressure above the metal melt, but independent of pulling velocity. Our predicted results are in agreement with experimental data.

关 键 词：POROSITY SOLIDIFICATION gasar eutectic growth asymptotic solution 

分 类 号：O78[理学—晶体学]