Question

At 700C (1290F), what is the maximum solubility (a) of Cu in Ag? ( b) Of Ag in Cu?

Answer 1

Answer:

(a) 4 %; (b) 5 %

Explanation:

We need a Cu-Ag phase diagram to answer these questions (see diagram). Yours may differ slightly from the one I used.

(a) Cu in Ag

The horizontal red line  at 700 °C cuts the right-hand solvus at about 4 % Ag-96 % Cu.

At this point, copper is in equilibrium with the eutectic.

At 700 °C, the maximum solubility of Cu is about 4 % by mass.

(b) Ag in Cu

The horizontal red line  at 700 °C cuts the left-hand solvus at about 5 % Cu-95 % Ag.

At this point, silver is in equilibrium with the eutectic.

At 700 °C, the maximum solubility of Ag is about 5 % by mass.