Question

Consider the Cu-Ag phase diagram provided. What phases are present at equilibrium if an alloy of Cu-50wt%Ag is held at 800°C. What are the compositions of the phases? Composition (at% Ag) - 40 60 80 1200 2200 100 2000 -Liquidus Liquid -Solidus ar + L 800 779°C (Te) 71.9 Temperature (°C) 91.2 (CBE) Temperature (°F) Solvus + B 20 80 100 40 60 Composition (wt% Ag) (Cu) (Ag) The phases present are a (8 wt%Ag, 92 wt%Cu) and B (93 wt%Ag, 7 wt%Cu). Only a (50 wt%Ag, 50 wt%Cu) is present. The phases present are a (8 wt%Ag, 92 wt%Cu) and L (67 wt%Ag, 33 wt%Cu). The phases present are a (33 wt%Ag, 67 wt%Cu) and L (67 wt%Ag, 33wt%Cu).

Answer 1

Answer: The phases present are $\alpha$ (8wt%Ag, 92wt%Cu) and L (67wt%Ag and 33wt%Cu)

The point corresponding to this temperature and composition lies in the ($\alpha$ + L) region of the phase diagram.

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