Effects of added carbon to Pb-Sb Phase diagram?

[jpandrew19]

How would cooling curves of a Pb-Sb phase diagram get effected if the composition had an added .5% carbon wt. concentration? My guess would be by adding an increased concentration of carbon, this would result in a increased duration of cooling needed to reach the eutectic reaction line.

Any ideas?

Thanks!

 

[Navin A S]

Yes, adding a higher concentration of carbon to the lead-antimony phase diagram would have an effect on the cooling curves. The addition of carbon would likely result in a decrease in the solidus temperature of the system, meaning that the liquidus temperature would be lower than it originally was. This would mean that the eutectic reaction line would reach faster and the cooling curve would be shifted downwards. Additionally, there is a possibility that the addition of carbon could cause the formation of intermediate phases that may alter the shape of the cooling curves.