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Why does solder have a lower melting point than Lead or Tin.
2

Why does solder have a lower melting point than Lead or Tin.

Why does solder have a lower melting point than Lead or Tin.

(OP)
Also are there any other alloys that exhibit the same properties.

RE: Why does solder have a lower melting point than Lead or Tin.

2
You can view many binary alloy (and a few ternary) phase diagrams at http://cyberbuzz.gatech.edu/asm_tms/phase_diagrams/
Solder alloys typically involve 2 or more of the following: Ag, Bi, Cu, In, Pb, Sn.
Present researches on solder alloys are directed toward 1) replacement of toxic Pb and 2) increased reliability (resistance toward thermal fatigue and the growth of Sn whiskers, etc.).  A portion each June issue of JOM is devoted to lead-free solders, e.g.,
http://doc.tms.org/servlet/ProductCatalog?container=JOM...
You can view the abstracts for free (entire articles if you are a TMS member).

A Pb-Sn phase diagram is below:


    

A liquidus surface of the Ag-Cu-Sn system used in some lead-free alloys is below:


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