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Preamble
Solidification is a phase transformation process in which liquid is transformed to solid when superheat and latent heat are removed. In this connection it is important to distinguish between solidification of pure metals and alloys. Pure metals solidify at constant temperature, whereas alloys solidify over a range of temperature. The following binary phase diagram illustrates the solidification in alloys:
| Fig. 31.1: |
Equilibrium phase diagram of a binary system (a) there is a complete solubility of the components in liquid and solid and (b) complete solubility of the components in the liquid phase and partial solubility in the solid phase. are solid solutions. Liquidus, solidus and solvus lines are shown by blue, green and black lines. |
Vertical dotted line show the temperature changes that occurs during solidification of an alloy of composition CO |
