b) 4p) If an alloy containing precipitates in an a matrix is given a solution treatment by heating to a temperature above the equilibrium solvus the precipitates will dissolve. (See for example the phase diagram below) Show with diagrams how the composition will change in the vicinity of an a/ interface during dissolution if the dissolution is (i) diffusion controlled, (ii) interface controlled, (iii), under mixed control. Indicate compositions by reference to a phase diagram where appropriate.