The figure is a portion of the titanium copper phase diagram for which only single-phase regions are labeled. Specify all temperature composition points at which eutectics, eutectoids, peritectics and congruent phase transformations occur.

I think i've found the eutectic and congruent point. (aprox 960 and 980 celsius) but how do I find the eutectoid and peritectic point?


Sorry for blurry image!


enter image description here

Assuming that the fields marked by x are solid and y is liquid, these are the points:

  1. a: eutectic point. Cooling will turn the single liquid into two solids. The point is between the composition of the two solids involved.
  2. b: eutectoid point. Cooling will turn the single solid into two solids.
  3. c: peritectic point. Cooling from immediately to the left will turn the solid into a liquid and a solid. The point is outside the composition of the two solids involved.
  4. d: congruent point: A solid will melt at this point to a liquid of the same composition.
  5. e: incongruent melting points. A solid will melt to a liquid and a solid. Note that the left one is intimately associated with the peritectic point.

There are no peritectoid points in this diagram. A peritectoid point is similar to a peritectic point, but with all phases solid.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.