HW4+Solution

# HW4+Solution - Louisiana State University Mechanical...

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

Louisiana State University Mechanical Engineering Department Professor Meletis ME 2733 Fall 2004 Materials of Engineering Homework Assignment #4 Solution 1. Atomic concentration for Ni (N) ) ( ) ( ) ' ( Weight Atomic Density x No s Avogadro N sites = mol g m cm cm g x mol atoms x N sites / 71 . 58 ) / 10 )( / 9 . 8 ( ) / 10 023 . 6 ( 3 3 6 3 23 = 3 29 / 10 13 . 9 m atoms x N sites = Vacancy concentration: ⎛ − = KT Q N N v sites v exp 3 20 5 29 / 10 485 . 9 673 10 62 . 8 2 . 1 exp 10 13 . 9 m vacancies x x x x N v = = The maximum concentration exists just before melting at 1726 K. Thus, 3 26 5 29 / 10 868 . 2 1726 10 62 . 8 2 . 1 exp 10 13 . 9 m vacancies x x x x N v = = _______________________________________________ 2. ) exp( 0 RT Q D D = or ) exp( 0 RT Q D D = s m k molK J mol J s m D / 10 37 . 1 ) ) 673 )( / 314 . 8 ( / 10 195 exp( ) / 10 ( 2 5 3 2 20 0 × = × = s m k molK J mol J s m D C o

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 note was uploaded on 01/22/2012 for the course ME 2733 taught by Professor Meng during the Fall '10 term at LSU.

### Page1 / 2

HW4+Solution - Louisiana State University Mechanical...

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

View Full Document
Ask a homework question - tutors are online