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| Kinetics and Microstructural Control | ||||||||||||||||
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| ·
If
cooling occurs rapidly, composition gradients are formed and equilibrium
bulk phases will not occur. This is shown for the Copper-Nickel
system.
· The first solid forms with the solidus concentration when the isotherm intersects the liquidus at the mean composition: Cu-40 wt % Ni, · As the temperature decreases, the liquid composition follows the |
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| From:
Askland, The Science and Engineering of Materials,
PWS (1994) |
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| liquidus. The new solid created follows the solidus, however, the solid phase has a concentration gradient between the center and the surface. The blue line shows the average composition of the solid at any given temperature. | ||||||||||||||||