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May 2007

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Subject:
From:
"David D. Hillman" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Wed, 23 May 2007 08:36:21 -0500
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Hi Werner! Here is the definition from the American Society for Metals 
(ASM) Metals Handbook, 2nd Edition:

"Eutectic. (1) An isothermal reversible reaction in which a liquid 
solution is converted into two or more intimately mixed solids on cooling, 
the number of solids formed being the same as the number of components in 
the system"

Now, your definition is perfectly correct too and I agree with it. 
However, using the terms Liquidus and Solidus are necessary in the 
definition. Most folks struggle a bit  with the terms Liquidus or Solidus 
and I didn't want to get too deep in the metallurgy (Mr. Pauls has such a 
hard time understanding metals and the English language in general  (if 
folks haven't noticed,  Doug and I are making fun of each other today). 

Lots of fun metallurgy discussions to start the day! Very cool.

Dave



Werner Engelmaier <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
05/23/2007 08:03 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
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Subject
Re: [TN] Definition of Eutectic Solder






Hi Dave,
Sorry, I must disagree; your definition of "1) Eutectic: when a metal 
alloy 
transforms from a liquid state into a
single solid state" is wrong.
A eutectic alloy composition is by definition that composition where the 
alloy's Solidus and Liquidus temperatures coincide and having the lowest 
melting 
temperature among all other alloy compositions of the same materials.

Werner



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