Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 8.15, Problem 48SEP
Based on the Pd–Ag phase diagram in Figure EP 8.3, draw the approximate cooling curve for the following alloys with approximate temperatures and explanations: (i) pure Pd, (ii) Pd–30 wt% Ag, (iii) Pd–70 wt% Ag, (iv) pure Ag.
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A 80%Sn-20%Pb alloy is melted fully at 300°C and then slowly cooled down to 182°C. Sketch the microstructures at 300°C, 200°C, and 182°C, respectively. Label all phases and indicate their approximate compositions. Also, determine the follows for this alloy at 182°C.
(1) The weight fractions of α and β phases.(2) The weight fractions of primary β and eutectic structure.(3) The weight fraction of eutectic β .
3. For a Pb-10% Sn alloy Determine
(a) composition of the first solid to form;
(b) liquidus temperature, solidus temperature, solvus temperature (as a pplicable), and freezing range
of the alloy;
(c) amounts and compositions of each phase at 300° C;
(d) amounts and compositions of each phase at 200° C; and
(e) amounts and compositions of cach phase at 100° C.
400
300
Liquidus
Solidus
Liquidus
Sohdus
a+ L
200
19
1831
619
97.5
Solvus
Solvus
100
a + B
Pb
20
40
60
80
Sn
Weight percent tin
Temperature ('C)
List the phase(s) that are present, the phase composition(s) and the weight fractions of the phase(s) for each of the following alloys:(a) 70 wt% Zn-30 wt% Cu at 300 C (b) 90 wt% Pb-10 wt% Sn at 325 C (c) 2.5 kg Cu and 5.0 kg Ag at 900 C (d) 37 lbm Pb and 6.5 lbm Mg at 500 C
Chapter 8 Solutions
Foundations of Materials Science and Engineering
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