Question

Question 7 --/1 View Policies Current Attempt in Progress A diffusion couple of two metals, A and B, was fashioned as shown: Diffusion of A atoms A-B alloy A Diffusion ofB atoms After a 32-hour heat treatment at 1010°C (and subsequent cooling to room temperature), the concentration of A is 3.9 wt% at the 12.6-mm position within metal B. If another heat treatment is conducted on an identical diffusion couple, this time at 900°C for 32 hours, at what position will the composition be 3.9 wt% A? The preexponential and activation energy values for the diffusion of A in B are 1.3 x 104 m2/s and 136 kJ/mol, respectively. х3 mm

Answer 1

Date : 1 W Care I Care-2 t=32 hour to 2 hour Tg = 1010c - 128K T-900 c = 3173K C = 38 wt% -3.3 wel de = 12,6 mm do = 1.30 50 4 mits Vcing Fick's and daw of x=9 Q = 136 kJ/mol diffusion, Se-to - esf( x ) Constant because for both G caves = 3.9 Wil

Date: T U here, t = = 32 hour D2 N do e Colar de-unde =27 sc de me x = 12,6 x 0.55 x = 6.93 mm - Anwez Fox At T=900 cfon 32 hows at 16.93 mm position will be composition will be 3.9 wt%