Eutectic Alloy - Revision history

DT Online at 11:16, 20 May 2017

2017-05-20T11:16:58Z

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	Non-Eutectic alloys solidify over a range of temperatures first passing through a semi-solid ‘pasty’ stage which becomes increasingly thick until it finally solidifies. This can be useful if the semi-molten alloys has to be worked in some way. ~~An alloy~~ of 70% Lead and 30% Tin can be seen from the [https://en.wikipedia.org/wiki/Phase_diagram '''Phase Diagram'''] to pass through a ‘pasty’ stage which is why traditional plumbers used ~~this composition~~ of solder for their ‘wiped joints’ - a process rarely used today.		Non-Eutectic alloys solidify over a range of temperatures first passing through a semi-solid ‘pasty’ stage which becomes increasingly thick until it finally solidifies. This can be useful if the semi-molten alloys has to be worked in some way. Alloys of equal parts Lead and Tin or 70% Lead and 30% Tin, can be seen from the [https://en.wikipedia.org/wiki/Phase_diagram '''Phase Diagram'''] to pass through a ‘pasty’ stage which is why traditional plumbers used these compositions of solder for their ‘wiped joints’ - a process rarely used today.


	[[Category:Terminology]]		[[Category:Terminology]]

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2017-03-23T11:20:10Z

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			{{#ev:youtube\|JW214idcg4VI\|200x250\|right\|\|frame\|loop=1&autoplay=0&playlist=W214idcg4VI}}
	Low melting point '''[[Alloy\|Alloys]]''' are useful in '''[[Sand Casting\|Casting]]''' for example, since less energy is needed to melt the metal, and the instant transformation from liquid to solid makes [https://en.wikipedia.org/wiki/Eutectic_system#Alloys '''Eutectic Alloy'''] very useful in soldering and brazing.		Low melting point '''[[Alloy\|Alloys]]''' are useful in '''[[Sand Casting\|Casting]]''' for example, since less energy is needed to melt the metal, and the instant transformation from liquid to solid makes [https://en.wikipedia.org/wiki/Eutectic_system#Alloys '''Eutectic Alloy'''] very useful in soldering and brazing.

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[[File:SolderPhaseDiagram.png|500px|right|Lead Tin Alloy Phase Diagram]]
The melting point of most metals is lowered when it is mixed, or '''[[Alloy|Alloyed]]''' with another element or impurity - just as spreading salt on ice will cause it to melt. Careful mixing of the alloying elements can lead to a range of '''[[Alloy|Alloys]]''' of the same constituent metals with different melting points ''(e.g. Hard, Medium and Easy '''[[Alloy#Solders|Silver Solder]]''')''.

There is one particular proportion which creates a mix having the lowest melting point possible for that '''[[Alloy]]'''. This is known as a [https://en.wikipedia.org/wiki/Eutectic_system#Alloys '''Eutectic Alloy''']. This special mix not only has the lowest melting point but also changes from liquid to solid at a fixed temperature - the '''Eutectic Point'''.

Low melting point '''[[Alloy|Alloys]]''' are useful in '''[[Sand Casting|Casting]]''' for example, since less energy is needed to melt the metal, and the instant transformation from liquid to solid makes [https://en.wikipedia.org/wiki/Eutectic_system#Alloys '''Eutectic Alloy'''] very useful in soldering and brazing.

Non-Eutectic alloys solidify over a range of temperatures first passing through a semi-solid ‘pasty’ stage which becomes increasingly thick until it finally solidifies. This can be useful if the semi-molten alloys has to be worked in some way. An alloy of 70% Lead and 30% Tin can be seen from the [https://en.wikipedia.org/wiki/Phase_diagram '''Phase Diagram'''] to pass through a ‘pasty’ stage which is why traditional plumbers used this composition of solder for their ‘wiped joints’ - a process rarely used today.

[[Category:Terminology]]