{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Homework 11 Solutions

Homework 11 Solutions - Homework#11 SOLUTIONS ENME 382/ENMA...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Homework #11 SOLUTIONS ENME 382/ENMA 300 Due: Monday, December 5, 2011 1. For each of the following alloys: i) Cite the phases that are present and the phase compositions for each of the phases and ii) determine the relative amounts (in terms of mass fractions) of each of the phases at the given temperature: (a) 25 wt% Pb–75 wt% Mg at 425°C (800°F) i) For an alloy composed of 25 wt% Pb-75 wt% Mg at 425 ° C, from Figure 10.20, only the α phase is present; its composition is 25 wt% Pb-75 wt% Mg. ii) For an alloy composed of 25 wt% Pb-75 wt% Mg at 425 ° C, only the α phase is present; therefore W α = 1.0. (b) 55 wt% Zn–45 wt% Cu at 600°C (1110°F) i)For an alloy composed of 55 wt% Zn-45 wt% Cu at 600 ° C, from Figure 10.19, β and γ phases are present,and C β = 51 wt% Zn-49 wt% Cu C γ = 58 wt% Zn-42 wt% Cu ii) Because the composition of the alloy, C 0 = 55 wt% Zn-45 wt% Cu, then, using the appropriate lever rule expressions and taking compositions in weight percent zinc (c) 7.6 lb m Cu and 144.4 lb m Zn at 600°C (1110°F) i) 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 5.6 OR first principles), as
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
From Figure 10.19, only the L phase is present; its composition is 95.0 wt% Zn-5.0 wt% Cu ii) For an alloy composed of 7.6 lbm Cu and 144.4 lbm Zn (95.0 wt% Zn-5.0 wt% Cu) at 600 ° C,
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}