For alloys of two hypothetical metals A and B, there exist an , A-rich phase and a , Brich phase.

For alloys of two hypothetical metals A andB, there exist an , A-rich phase and a , Brichphase. From the mass fractions of bothphases for two different alloys provided in thefollowing table (which are at the same temperature),determine the composition of thephase boundary (or solubility limit) for both and phases at this temperature.Alloy Composition Fraction Fraction Phase Phase60 wt% A–40 wt% B 0.57 0.4330 wt% A–70 wt% B 0.14 0.86