# Is it possible, given a target temperature, to create an alloy that melts at precisely that temperature?

Assuming the target melting points are between the melting points of mercury and tungsten, is it possible, given a target temperature, to create an alloy (or compound) composition that has a direct (say eutectic) transformation to liquid at +/- one degree of the target temperature?

If yes, is there a method for identifying the elements to use based on the target temperature?

• That is actually a hard question to answer properly. Do you mean an alloy (or compound) composition that has a direct (say eutectic) transformation to the liquid? – Jon Custer Jan 2 '16 at 16:59
• The answer hinges on how you define "precisely". Melt within +/- 5 degrees yes. All melt within +/- 0.01 degree no. So you'd have to make a 80/20 by weight mixture of the metals which by the phase diagram should melt at temperature T. You then melt the metals and quickly quench the melt. The composition will be almost homogeneous, but not absolutely. – MaxW Jan 2 '16 at 17:11
• Probably no. Alloys melt at precise temperature in two cases: eutectics and intermetallics. Given number of metals it is reasonable to expect that some eutectic or intermetallic would melt quite close to required temperature. But identifying such composition is another matter entirely. – permeakra Jan 2 '16 at 17:54
• You can identify materials (alloys and many others) with certain physical characteristics (such as melting point within a temperature range) and see what emerges from a database - I use [Matweb](www.matweb.com) for this sort of thing on occasion. I entered the temperature range of -38.83 $^{\circ}$C to 3422 $^{\circ}$C and got 619 hits under the "Solder/Braze Alloy" category. I now know that 97% lead, 2.5% tin, and 0.5% silver solder melts between 303-310 $^{\circ}$C, with the lower number corresponding to the solidus and the higher one to the liquidus. Might be of help to you... – Todd Minehardt Jan 2 '16 at 18:08
• The other facet to this is do you want the metal to melt/solidify at that temperature or just melt once at that temperature. // !@#\$%^& theoretical rabbit holes. – MaxW Jan 2 '16 at 18:13