Question

Is it possible to have a copper–silver alloy of composition 20 wt% Ag–80 wt% Cu that, at equilibrium, consists of α and liquid phases having mass fractions Wα= 0.80 and WL=0.20? If so, what will be the approximate temperature of the alloy? If such an alloy is not possible, explain why?

Answer 1

Answer:

composition 20 wt% Ag–80 wt% Cu that, at equilibrium, consists of ? and liquid phases having mass fractions W ? = 0.80 and W L = 0.20? If so, what will be the approximate temperature of the alloy? If such an alloy is

Answer 2

Answer:

It isnot possibleto have a Cu-Ni alloy, which at equilibrium, consists of a liquid phase of composition 20wt% Ni-80 wt% Cu and anα phase of composition 37 wt% Ni-63 wt% Cu.

Explanation:

• a , a single tie line doesnot exist within the (α+l).
• region that intersects the phase boundaries at the given compositions.
• At 20 wt% Ni, theL-(α+L) phase boundary is at about 1200°C, whereas at 37 wt% Ni the ( L+α)-α
• phase boundary is at about1230°C.