For equilibrium conditions and a Nb-80 wt% W alloy, determine
(a) The liquidus temperature;
(b) The solidus temperature;
(c) The freezing range;
(d) The composition of the first solid to form during solidification;
(e) The composition of the last liquid to solidify;
(f) The phase(s) present, the composition of the phase(s), and the amount of the phase(s) at 3000 °C; and (g) the phase(s) present, the composition of the phase(s), and the amount of the phase(s) at 2800 °C?