A diffusion couple similar to that shown in Figure 5.1a is prepared using two hypothetical metals A
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A diffusion couple similar to that shown in Figure 5.1a is prepared using two hypothetical metals A and B. After a 20-h heat treatment at 800°C (and subsequently cooling to room temperature) the concentration of B in A is 2.5 wt% at the 5.0-mm position within metal A. If another heat treatment is conducted on an identical diffusion couple, but at 1000°C for 20 h, at what position will the composition be 2.5 wt% B? Assume that the pre-exponential and activation energy for the diffusion coefficient are 1.5 × 10-4 m2/s and 125,000 J/mol, respectively?
Figure 5.1a
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Materials Science and Engineering An Introduction
ISBN: 978-1118324578
9th edition
Authors: William D. Callister Jr., David G. Rethwisch
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