: Construct the hypothetical phase diagram for metals A and B between temperatures of 200?C and 2200?C given the following information:
?The melting temp of pure A is 2200 ?C
?Pure A is polymorphic with a high temp phase stable from 2200 to 1900 ?C having a?maximum solubility of 5 wt% B, a medium temperature phase stable from 1900 to 1000 ?C?having a maximum solubility of 20 wt% B, and a low temperature phase stable from 1000 ?C?to room temp and a maximum solubility of 5 wt% B.
?Pure B melts at 600 ?C and has negligible solubility of A in the solid matrix
?A miscibility gap in the liquid forms at 85 wt% B and 1500 ?C
?An intermediate phase (zeta) melts congruently at 65 wt% B and 1900 ?C; the zeta phase can?exist over a composition range of 60 to 70 wt% B
?The medium temperature A phase forms from a peritectic reaction with liquid and the high
temperature phase at 10 wt% B, 2000 ?C
?Two eutectics are present: 50 wt% B, 1400 ?C ,?? 95 wt% B, 400 ?C
?One monotectic reaction is at 80 wt% B, 1100 ?C
?One additional reaction is present at 15 wt% B and 600 ?C (eutectoid, eutectic, peritectic, or peritectoid, you tell me)
: Using the diagram you constructed, describe the microstructure (qualitatively and quantitatively) of a hypothetical alloy composed of 10 wt% A and 90 wt% B as it is cooled at a slow rate from a liquid to 395?C. Be certain your description captures all relevant transformations throughout the cooling process and state any assumptions made in describing the progression of structure.