Homework 9-solutions

# Homework 9-solutions - MAT 33 Fall 2008 Due: 11/24/08...

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MAT 33 – Fall 2008 Homework #9- Solutions Due: 11/24/08 1.) Consider an 85 wt% Ag-15 wt% Cu alloy in equilibrium at 800 o C. a.) What phase(s) is (are) present? b.) What is (are) the corresponding phase composition(s)? c.) What is (are) the relative amounts of the phase(s) (expressed in terms of weight fractions)? a .29 β and L b.) C L = 77 wt % Ag C β = 92 wt % Ag c.) W L = 92 - 85 92 - 77 = 0.47 W β = 0.53

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2.) Consider the Sn-Au phase diagram a.) List all eutectic reactions. b.) List all eutectoid reactions. c.) If a 50 wt%Au-50wt% Sn alloy is slowly cooled from 500 o C, what is the first solid phase to form and what is its composition? a.) At 10 wt % Sn and T = 200 ° C, L α + β At 80 wt % Sn and T = 280 ° C, L δ + ζ b.) no eutectoids c .29 δ is the first solid phase to form. C δ = 63 wt % Au.
3.) Answer the following questions using the Pb-Sn phase diagram. One kilogram of a 70 wt% Pb – 30 wt% Sn alloy is slowly cooled from 300 o C. a.)

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## This note was uploaded on 02/10/2009 for the course MAT 33 taught by Professor Keith during the Spring '07 term at Lehigh University .

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Homework 9-solutions - MAT 33 Fall 2008 Due: 11/24/08...

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