Question
Fluidity of a molten alloy during sand casting depends on its solidification range. The phase diagram of a hypothetical binary alloy of components A and B is shown in the figure with its eutectic composition and temperature. All the lines in this phase diagram, including the solidus and liquidus lines, are straight lines. If this binary alloy with 15 weight % of B is poured into a mould at a pouring temperature of 800 ºC, then the solidification range is
Options :
400 ºC
250 ºC
800 ºC
150 ºC
Answer :
150 ºC
Solution :
To find the solidification range at 15 weight % of B we need to draw the point at which solidification is completed on the solidus line (AD).
We can see that point C is the solidification point and temperature can be found using similar triangles.
BE = solidification range
By using similar triangles ABC and ADE
AE = 700 - 400 = 300
BC = 15 , ED = 30
AB = 150° C
BE = AE - AB
BE = 300 -150 = 150° C
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