# HW4-new - [110] [001] ME311 MATERIALS ENGINEERING SPRING...

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

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.

Unformatted text preview: [110] [001] ME311 MATERIALS ENGINEERING SPRING 2011 HOMEWORK #4 DUE DATE: February 25, before class PROBLEM 1: The measured density of a sample of bcc iron is 7.87 g/cm 3 . If the lattice parameter of this sample is 0.2866 nm, calculate the percentage of vacancies in this sample. Assume the atomic weight of iron to be 55.85 g/mole. Hint: In the absence of vacancies, bcc iron has 2 atoms/unit cell. Consider that the density is mass/volume. PROBLEM 2: You are an engineer working in a nuclear plant. In order to select the appropriate material for the reactor you perform a series of experiments to determine the equilibrium mole fraction of vacancies as a function of the working temperature. The results from your experiments are shown in the table below. Based on the data you have generated, determine a) the entropy/mole of vacancies, b) the enthalpy of vacancy formation /mole of vacancies and c) the equilibrium mole fraction of vacancies at 400 o C....
View Full Document

## This note was uploaded on 09/04/2011 for the course ME 311 taught by Professor Meyers during the Spring '08 term at University of Texas.

### Page1 / 3

HW4-new - [110] [001] ME311 MATERIALS ENGINEERING SPRING...

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

View Full Document
Ask a homework question - tutors are online