Industrial Plastics: Theory and Applications
6th Edition
ISBN: 9781285061238
Author: Lokensgard, Erik
Publisher: Delmar Cengage Learning
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During the solidification of a binary alloy, with a positive temperature gradient in the melt,
a planar solid-liquid interface is moving at the steady state, Fig. Q1(i). The variation of the
solute concentration, C, in the melt ahead of the interface is given by,
b)
If m is the liquidus gradient, or the slope of liquidus, Fig.Q1 (iv), how does the
equilibrium temperature, T, vary with the melt composition C?
T₁ =
C=C1+ exp
R.x
D
(equation 1.1)
T
L
Solid
Melt
(iv) T₁
S
S+L
where Co is the nominal solute concentration in the alloy, Ko is the equilibrium distribution
coefficient, R is the solid-liquid interface moving rate, D is the solute diffusivity in the melt
and x is distance into the liquid phase, Fig. Q1(ii).
Answer the questions in the steps below, to show that the level of constitutional
supercooling is governed by both the actual temperature, T, and the composition, C, in the
solidification front.
a)
Consider a point in the melt at a distance x away from the solid/melt…
Practise question of phase transformations topic that I need help on thank you.
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