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http://hdl.handle.net/123456789/3663
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| Title: | E ective Vacancy Di usion in NiAl Binary Alloy |
| Authors: | Yoseph, Abebe |
| Advisors: | Dr. Mulugeta Bekele, |
| Keywords: | triple defect mechanism
Di usion |
| Copyright: | Jun-2011 |
| Date Added: | 6-Nov-2012 |
| Publisher: | AAU |
| Abstract: | We considered three di erent types of mechanisms by which a vacancy di uses: next
nearest neighbor(NNN) jumps, triple defect mechanism and two variants of six-jumps
cycles([110] and [100] bent directions). This is investigated by considering the vacancy
di usion as motion of a Brownian particle in a potential eld. We used the migration
energy pro le for the three types of mechanisms simulated by Kristen et al [1] to evaluate
the e ective vacancy di usion coe cient at two high temperature values. We have found
that their e ective vacancy di usion coe cient depends on migration energy and temperature
for the three vacancy di usion mechanisms. We compared the e ective vacancy
di usion coe cient for the three vacancy di usion mechanisms and identi ed that the
triple defect path is the fastest than the other two di usion mechanisms.
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| Description: | A THESIS PRESENTED TO THE SCHOOL OF GRADUATE STUDIES ADDIS ABABA
UNIVERSITY IN PARTIAL FULFILLMENT OF THE
REQUIREMENTS FOR THE DEGREE OF
MASTER OF SCIENCE IN PHYSICS |
| URI: | http://hdl.handle.net/123456789/3663 |
| Appears in: | Thesis - Physics
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