hs8201s06

# hs8201s06 - EMSE 201 Introduction to Materials Science...

This preview shows pages 1–2. Sign up to view the full content.

EMSE 201 – Introduction to Materials Science & Engineering Spring 2006 Case Western Reserve University 1/4 Case School of Engineering Solution to Homework Set #8 assigned Monday 20, March due Monday, 27 March 1) (9 points) Callister, problem 9.33 9.33 (a) This portion of the problem asks that we determine the mass fractions of α and β phases for an 80 wt% Sn-20 wt% Pb alloy (at 180 ° C). In order to do this it is necessary to employ the lever rule using a tie line that extends entirely across the α + β phase field (Figure 9.7), as follows: W α = C β C o C β C α = 97.8 80 97.8 18.3 = 0.224 (2 points) W β = C o C α C β C α = 80 18.3 97.8 18.3 = 0.776 (2 points) (b) Now it is necessary to determine the mass fractions of primary β and eutectic microconstituents for this same alloy. This requires us to utilize the lever rule and a tie line that extends from the maximum solubility of Pb in the β phase at 180 ° C (i.e., 97.8 wt% Sn) to the eutectic composition (61.9 wt% Sn). Thus W β

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This document was uploaded on 11/08/2011.

### Page1 / 4

hs8201s06 - EMSE 201 Introduction to Materials Science...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online