1. Numerical description for the recalescence of bulk-undercooled Cu70Ni30 alloy
- Author
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Yang, W., Liu, F., Liu, H., Wang, H.F., Yang, G.C., and Zhou, Y.H.
- Subjects
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METAL crystal growth , *COPPER-nickel alloys , *SOLID solutions , *SOLIDIFICATION , *GIBBS' free energy , *SOLID-liquid equilibrium , *TEMPERATURE effect - Abstract
Abstract: Assuming thermal balance and solute conservation, a numerical model has been proposed to describe the recalescence behavior of bulk-undercooled Cu–Ni melts. Applying a finite-difference scheme, the transformed solid fraction upon recalescence is given as a function of the liquid temperature, while the average liquid concentration can be tracked by calculation of the liquid/solid (L/S) Gibbs energy difference, in combination with a dendrite growth model. Accordingly, a transition from non-equilibrium to equilibrium process has been described from the evolution of L/S Gibbs energy difference. Applying the present model, the experimentally observed maximum recalescence temperature can be well predicted. [Copyright &y& Elsevier]
- Published
- 2009
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