# A 90 wt ag 10 wt cu alloy is heated to a temperature

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10.17 A 90 wt% Ag-10 wt% Cu alloy is heated to a temperature within the β+ liquid phase region. If the composition of the liquid phase is 85 wt% Ag, determine:(a) The temperature of the alloy(b) The composition of the βphase(c) The mass fractions of both phases(a) In order to determine the temperature of a 90 wt% Ag-10 wt% Cu alloy for which βand liquid phases are present with the liquid phase of composition 85 wt% Ag, we need to construct a tie line across the β+ Lphase region of Figure 10.7 that intersects the liquidus line at 85 wt% Ag; this is possible at about 850°C.(b) The composition of the βphase at this temperature is determined from the intersection of this same tie line with solidus line, which corresponds to about 95 wt% Ag.(c) The mass fractions of the two phases are determined using the lever rule, Equations 10.1 and 10.2 with C0= 90 wt% Ag, CL= 85 wt% Ag, and Cβ= 95 wt% Ag, as
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