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Introduction To Materials Science And Engineering (MSE 245) Homework 9

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Boise State University

Introduction To Materials Science And Engineering (MSE 245)

PHASE DIAGRAMS
PROBLEM SOLUTIONS
9.7 Given here are the solidus and liquidus temperatures for the copper–gold system. Construct the phase diagram
for this system and label each region.

(a) For an alloy composed of 15 wt% Sn-85 wt% Pb and at 100C, from Figure 9.8,  and  phases are
present, and using a tie line constructed at this temperature, the compositions of these phases are determined as
follows:

(b) For an alloy composed of 25 wt% Pb-75 wt% Mg and at 425C, from Figure 9.20, only the  phase is
present; its composition is 25 wt% Pb-75 wt% Mg.

(c) For an alloy composed of 85 wt% Ag-15 wt% Cu and at 800C, from Figure 9.7,  and liquid phases
are present, and using a tie line constructed at this temperature the compositions of these phases are determined as
follows:

(d) For an alloy composed of 55 wt% Zn-45 wt% Cu and at 600C, from Figure 9.19,  and  phases are
present, and using a tie line constructed at this temperature, the compositions of these phases are determined as
follows:

(e) For an alloy composed of 1.25 kg Sn and 14 kg Pb and at 200C, we must first determine the Sn and Pb
concentrations in weight percent (using Equation 4.3a), as

(f) For an alloy composed of 7.6 lbm Cu and 144.4 lbm Zn and at 600C, we must first determine the Cu
and Zn concentrations (using Equation 4.3a), as

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Introduction To Materials Science And Engineering (MSE 245) Homework 9

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