Copper (Cu) and silver (Ag) alloys form a binary alloy system that dissolves each other completely in the liquid state but only partially soluble in each other in the solid state. - The melting point of Cu is 1080 C and the melting point of Ag is 960 C. - At a temperature of 790 C, a eutectic reaction occurs in the 72% Ag alloy. At this temperature, Cu capable of dissolving 10% Ag and its eutectic microstructure is known to have a ratio of /β = 7/19 (find the point of solubility of Cu in Ag at the eutectic temperature). - At room temperature (25 C), Cu metal can dissolve 5% Ag while Ag metal can dissolve 2% Cu. a. Draw a phase diagram of the alloy system complete with the names of points, lines and phase regions. b. The 80%Ag alloy is cooled in equilibrium. i. Draw the cooling curve from liquid to solid state, complete with temperature, the phases at each stage and the reactions that occur. ii. At the eutectic temperature (4a before and 4b after the eutectic reaction), determine the phases stability, relative amount/percentage of phase and composition of Cu and Ag in each pha
Copper (Cu) and silver (Ag) alloys form a binary alloy system that dissolves each other
completely in the liquid state but only partially soluble in each other in the solid state.
- The melting point of Cu is 1080 C and the melting point of Ag is 960 C.
- At a temperature of 790 C, a eutectic reaction occurs in the 72% Ag alloy. At this temperature, Cu
capable of dissolving 10% Ag and its eutectic microstructure is known to have a ratio of /β = 7/19 (find
the point of solubility of Cu in Ag at the eutectic temperature).
- At room temperature (25 C), Cu metal can dissolve 5% Ag while Ag metal can
dissolve 2% Cu.
a. Draw a phase diagram of the alloy system complete with the names of points, lines and phase regions.
b. The 80%Ag alloy is cooled in equilibrium.
i. Draw the cooling curve from liquid to solid state, complete with
temperature, the phases at each stage and the reactions that occur.
ii. At the eutectic temperature (4a before and 4b after the eutectic reaction), determine the phases
stability, relative amount/percentage of phase and composition of Cu and Ag in each phase.
iii. At room temperature, draw the microstructure of this alloy and calculate the amount
relative/percentage eutectic, proeutectic and eutectic.
c. If the percentage of eutectic microstructure is known at room temperature is 27 %, determine
what % Ag is combined. Calculate the percentage of its proeutectic and eutectic at temperature
room.
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