Figure below shows a cooling curve for an AlSi alloy and the

Figure below shows a cooling curve for an Al-Si alloy and the binary phase diagram for this system. Determine:

a) The pouring temperature

b) the super heat

c) the liquidus temperature

d) the eutectic temperature

e) the freezing range

f) the local solidification time

g) the total solidification time

h) the composition of the alloy

>> Solution (a)

From 1st Figure, the pouring temperature is the maximum temperature, after that it is allowed to cool

So, Pouring Temperature = 1170 C

>> Solution (b)

Supeheat = 1000 - 577 = 423 C

>> Solution (c)

As, Liquidus is the lowest temperature at which an alloy is completely liquid

For Aluminium, Liquidus Temperature = 623 C

and for Silicon, Liquidus Temperature = 1405 C

>> Solution (d)

Eutectic Temperature is the temperature at which one liquid phase gets converted into two solid phases

So, here Eutectic Temperature = 577 C,