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Initial temperature of Liquid /°C
  
Length of casting /cm
 
The melting temperature of the metal is 650 oC, so the molten metal cannot be poured into the mould at this temperature.
- - - T mould Liquid
As the molten metal cools, ΔTint decreases, and therefore the rate of cooling decreases.
On reaching the melting point the casting solidifies at the mould wall and forms an air gap, due to the higher density of the solid material.
The latent heat has to be removed from the casting for it to fully solidify, by conduction through the air gap. The casting will slowly approach the temperature of the mould but never actually reach it.
10 cm Temp / °C 750 700 650 600 550 500 0 1 2 3 4 5 6 7 time / s