Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 20    No. 3    March 2010

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Effect of nonlinear liquidus and solidus on dendrite growth in
bulk undercooled melts
CHEN Zheng(陈 正), WANG Hai-feng(王海丰), LIU Feng(刘 峰), YANG Wei(杨 伟)

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

Abstract:On the base of nonlinear liquidus and solidus, an extended model for dendrite growth in bulk undercooled melts was developed under local non-equilibrium conditions both at the interface and in the bulk liquid. In terms of thermodynamic calculations of the phase diagram, the model predictions are relatively realistic physically, since few fitting parameters are used in the model predictions. Adopting three characteristic velocities, i.e. the critical velocity of absolute solute stability (VC*), the velocity of maximal tip radius (VRm), and the velocity of bulk liquid diffusion (VD), a quantitative agreement is obtained between the model predictions and the experimental results in undercooled Ni-0.7%B and Ni-1%Zr (molar fraction) alloys, and the overall solidification process can be categorized.


Key words: dendrite growth; undercooled melts; Ni-based alloys

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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