Modelling the crystal growth in highly undercooled alloy melts by non-isothermal phase-field method
Li Mei-E (李梅娥)a, Yang Gen-Cang (杨根仓)b, Zhou Yao-He (周尧和)b
a School of Material Science and Engineering, Xi'an Jiaotong University,Xi'an 710049, China; b State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Abstract A non-isothermal phase-field model is used to simulate the rapid solidification of highly undercooled alloy melts. The influence of undercooling on the solidification process is studied. It is indicated that with the increase of undercooling, the dendrite morphology changes from poorly developed dendrite, via the well-developed dendrite containing secondary and ternary arms, to the compact diamond-shaped grain. With increasing undercooling, the tip radius changes in the following rule: decrease $\to$ increase $\to$ decrease while the growth velocity increases constantly,which is consistent with the results predicted by the Boettinger--Coriell--Trivedi model. The thermal, solutal and kinetic undercooling contributions under different initial undercooling are also determined. It is shown that when the undercooling is increased beyond a certain value, the thermal undercooling contribution exceeds the solutal contribution and the dendrite growth transits from solutal diffusion controlled to thermal diffusion controlled one.
Received: 23 July 2004
Revised: 02 October 2004
Accepted manuscript online:
(Whiskers and dendrites (growth, structure, and nonelectronic properties))
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 50395103 and 50271057) and by the fund of the State Key Laboratory of Solidification Processing in NPU, China.
Cite this article:
Li Mei-E (李梅娥), Yang Gen-Cang (杨根仓), Zhou Yao-He (周尧和) Modelling the crystal growth in highly undercooled alloy melts by non-isothermal phase-field method 2005 Chinese Physics 14 838
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