Question 231: (a) With reference to the Figure 1 below, plot (and clearly label) the composition profile across a diffusion couple of (A-B) after annealing at T1. (Note: consider that final equilibrium is not achieved). (b) Now consider a diffusion couple made by welding pure A to an A-47 w/o B alloy as illustrated in Figure 2. Upon reaching equilibrium at T1 find the position of the interface for an overall sample composition of A-20 w/o B. (D = 5x10^-10 cm²/s).

Figure 1:

Figure 2: