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What is cutectic point??

What is cutectic point??

Grade:12

4 Answers

VEERU YERRAYYA
45 Points
8 years ago

eutectic point 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.

yours katarnak Suresh
43 Points
8 years ago

A eutectic system is a mixture of chemical compounds or elements that has a single chemical composition that solidifies at a lower temperature than any other composition made up of the same ingredients. This composition is known as the eutectic composition and the temperature is known as the eutectic temperature. On a phase diagram the intersection of the eutectic temperature and the eutectic composition gives the eutectic point.[1] Not all binary alloys have a eutectic point; for example, in the silver-gold system the melt temperature (liquidus) and freeze temperature (solidus) both increase monotonically as the mix changes from pure silver to pure gold.[2]

Aravind Bommera
36 Points
8 years ago
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:T...-Reactions.png ,
which should be more clear.

Here is another site which discusses binary phase diagrams.
http://csmres.jmu.edu/geollab/Fichte...x/BinryEu.html
 
bhaveen kumar
38 Points
8 years ago

1. Of, relating to, or formed at the lowest possible temperature of solidification for any mixture of specified constituents. Used especially of an alloy whose melting point is lower than that of any other alloy composed of the same constituents in different proportions.

2. Exhibiting the constitution or properties of such a solid.

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