CAl Yingwen
,
MAO Xiemin
,
LI Jianguo
,
FU HengzhiNorthwestern Polytechnieal University
,
Xi'an
,
China Manuscript received 14 March
,
1994
金属学报(英文版)
Theoretical model for non -equilibrium solidification is constructed with consideration of diffuse interface and multiphase fluctuation. It can he degenerated to Aziz continuous growth model in the case of mono-atomic approximation. for large undercooling, the change of heat capacity should not he neglected and it usually gives an increase in the interface partition coefficient. Solute trapping may happen at a rather slow growth rate compared with that predicted by other models, because the undercooling and structural relaxation ahead of the S/ L interface lowers the interfacial diffusivity to a great extent. Plase fluctuation has two contending effects, decrease in energy barrier and increase in atomic dragging, therefore exerts dual influences on the partition coefficient.
关键词:
diffuse interface
,
null
,
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