Consider the unidirectional solidification of an alloy with composition X0. Sketch how the temperature of the solid/liquid interface varies as the solidification proceeds from 0 to 100% when the solidification is under the conditions of a) equilibrium conditions, b) no diffusion in solid and perfect mixing in liquid, and c) no diffusion in solid and only diffusional mixing in liquid. Use the phase diagram given and indicate the exact temperatures when possible. 7