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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/3663

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. v
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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