Understanding Eutectic Point: Definition and Calculation

[chound]

What is eutectic point?

 

[ccl4]

What is eutectic point?

see here:

http://en.wikipedia.org/wiki/Eutectic



ccl4

 

[chound]

Actually I read that but couldn't understand what was written that's why I posted here

 

[Astronuc]

chound, what is not clear in the wikipedia article.

The key point is:

A eutectic or eutectic mixture is a mixture of two or more phases at a composition that has the lowest melting point, and where the phases simultaneously crystallise from molten solution at this temperature.

In the two phase diagram given, the eutectic is found at the "V" of the liquid phase, where the vertex touches the horizontal line. The horizontal line represents a constant temperature, and the vertex represents a specific composition. The eutectic represents the point where that composition goes 'directly' from solid to liquid, i.e. without partially melting to a solid-liquid combination.

The example of the steel (Fe - C) system is perhaps better.
http://en.wikipedia.org/wiki/Eutectic#Eutectoid
This figure shows the eutectic and eutectoid.

Then there is a three-phse reactions diagram below that:
http://en.wikipedia.org/wiki/Image:Three-Phase-Reactions.png ,
which should be more clear.

Here is another site which discusses binary phase diagrams.
http://csmres.jmu.edu/geollab/Fichter/IgnRx/BinryEu.html

 

[Gokul43201]

What is eutectic point?

Look at this post from another forum. It may be helpful.

http://www.scienceforums.net/forums/showpost.php?p=183126&postcount=20