For high technological industries, you evaluate metals and ceramics beyond the Fe-C alloys to more costly applications.

A.

B.

The figures below give the diffusion coefficients of niobium and silicon in m2/s for alpha- Nb5Si3. and NbSi2.

1. With the data given in the figure, below, determine the diffusion of Nb within

   alpha-Nb5Si3 at 1940C.

2. What is the difference in size between NbSi2 and alpha-Nb5Si3 in 10 minutes

   within the Nb-Si matrix at 1560 K if the diffused Nb reacts to form the silicides?

3. Determine the wt%Nb and mass needed to prepare Nb5Si3 for one kg of silicide

   be certain to show any calculations.

From the Al-Cu phase diagram, below, give the three-phase reactions for a eutectic, peritectic, peritectoid, congruent, and euctectoid reactions along with their respective temperatures at which they occur.